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  • Books  (106)
  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials  (106)
  • KIT Scientific Publishing  (106)
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  • Books  (106)
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  • 1
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    Advanced Elastocaloric Cooling Devices Based on Shape Memory Alloy Films (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Elastocaloric cooling is an emerging solid-state cooling technology with the potential to provide environmentally friendly, efficient cooling. The elastocaloric effect in superelastic shape memory alloy films is used to develop advanced cooling devices for small-scale applications. Cascaded and parallelized devices are developed to increase device temperature span and cooling capacity. The concepts are proven experimentally, a maximum temperature span of 27° C is achieved in a cascaded device.
    Keywords: Elastokalorik ; Festkörperkühlung ; Kaskadierte Kühleinheit ; Superelastische Formgedächtnislegierung ; Aktive Miniatur Kühlung ; Elastocaloric Cooling ; Solid-State Cooling ; Superelastic Shape Memory Alloy ; Cascaded Cooling Device ; Small Scale Cooling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 2
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    Microstructure modeling and crystal plasticity parameter identification for predicting the cyclic mechanical behavior of polycrystalline metals (2023)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Computational homogenization permits to capture the influence of the microstructure on the cyclic mechanical behavior of polycrystalline metals. In this work we investigate methods to compute Laguerre tessellations as computational cells of polycrystalline microstructures, propose a new method to assign crystallographic orientations to the Laguerre cells and use Bayesian optimization to find suitable parameters for the underlying micromechanical model from macroscopic experiments.
    Keywords: Polykristalline Metalle; Ermüdung; Mikromechanische Modellierung; Laguerre-Kachelungen; Texturkoeffizienten-Optimierung; Polycrystalline metals; Fatigue; Micromechanical modeling; Laguerre tessellations; Texture coefficients optimization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 3
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    Thermomechanical Modeling and Experimental Characterization of Sheet Molding Compound Composites (2023)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The aim of this work is to model and experimentally characterize the anisotropic material behavior of SMC composites on the macroscale with consideration of the microstructure. Temperature-dependent thermoelastic behavior and failure behavior are modeled and the corresponding material properties are determined experimentally. Additionally, experimental biaxial damage investigations are performed. A parameter identification merges modeling and experiments and validates the models.
    Keywords: SMC Verbundwerkstoff; Thermomechanische Eigenschaften; Mikrostrukturbasierte Makromodellierung; Biaxiale Schädigungs- und Versagens-Experimente; SMC composite; Thermomechanical properties; Microstructure-based macro modeling; Biaxial damage and failure experiments ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 4
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    Beitrag zur Entwicklung von Konstantflusspumpen für Frischbeton unter genauerer Betrachtung der Dickstoffventile (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: On almost every construction site, mobile fresh-concrete pumps of different designs can be found, all of which have an interruptions in delivery. In this work, a fresh-concrete constant-flow pump is developed and simulated. In order to be able to develop the new type of fresh-concrete valve required for this, knowledge is built up in a first step. This is done with a test bench using statistical design of experiments.
    Keywords: Konstantflusspumpe für Frischbeton ; Frischbetonventil ; statistische Versuchsplanung ; virtual Prototyping ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 5
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    Fundamentals for the Dimensioning and Optimization of Prestressed Segmented Girders for Application in Bridge Crane Systems (2022)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Bridge cranes are widely used as discontinuous material handling systems in industrial environments. The so-called crane bridge plays a central role in the overall construction. With increasing span widths and load capacities, the dimensions of the crane bridge also increase. The core of this work is the design and optimization of a new type of bridge crane system, which consists of individual segments and is eccentrically pretensioned by a tensile member.
    Keywords: Maschinenbau; Kranbau; Nichtlineare Optimierung; Mechanik; Mechanical Engineering; Crane construction; Nonlinear Optimization; Engineering mechanics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 6
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    Modellierung von Lithium-Ionen-Batterien zur Lebensdauerprädiktion unter besonderer Berücksichtigung des Anodenüberhangeffekts (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The focus of this work is on the modelling of the degradation behaviour of conventional lithium-ion cells with graphite/NMC electrodes in conjunction with electrolytes based on LiPF6 in organic solvents. The potential for improvements of parameterization methods dealing with physical-chemical aging effects and simulation studies for optimization of the battery lifetime is shown. In the process of model parameterization mostly data-based as well as non-invasive analysis methods are used.
    Keywords: Lithium-Ionen-Zelle ; Batterie ; Elektrofahrzeug ; Degradationsmechanismen ; Lebensdauerprädiktion ; lithium-ion cell ; battery ; electric vehicle ; degradation mechanism ; lifetime prediction ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 7
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    Assistenzsysteme zur Reduktion des Schädigungsverhaltens von Komponenten einer mobilen Arbeitsmaschine (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: In this work, modular damage reduction assistance systems are investigated. Identification modules provide information about the current driving and working state, the machine operator, the bulk material mass and system parameters. Damage modules with complexity reduced calculation approaches allow a quantification of the machine damage. Possible applications and the potential of the assistance systems are demonstrated in a model-based development environment.
    Keywords: Assistenzsysteme ; Schädigungsreduktion ; Machine Learning ; Modellbasierte Entwicklung ; Radlader ; assistance systems ; damage reduction ; machine learning ; model-based development ; wheel loader ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 8
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    Process simulation of wet compression moulding for continuous fibre-reinforced polymers (2022)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Interdisciplinary development approaches for system-efficient lightweight design unite a comprehensive understanding of materials, processes and methods. This applies particularly to continuous fibre-reinforced plastics (CoFRPs), which offer high weight-specific material properties and enable load path-optimised designs. This thesis is dedicated to understanding and modelling Wet Compression Moulding (WCM) to facilitate large-volume production of CoFRP structural components.
    Keywords: Faserverbundkunststoffe; Nasspresstechnologie; Kohlefasergewebe; FEM-Methode; Abaqus; Fiber composite plastics; Wet compression molding; carbon fiber fabric; FEM ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 9
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    Ferromagnetische Inhomogenitäten zur berührungslosen Bestimmung der Geschwindigkeit und gleisselektiven Position von Schienenfahrzeugen (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Ferromagnetic inhomogeneities along the track serve as landmarks. With these, each track section in the track network can be uniquely identified. In addition to non-contact speed determination, this also provides a track-selective method for determining the absolute position of the rail vehicle.
    Keywords: bordautonome Lokalisierung ; berührungslose Geschwindigkeitsmessung ; ferromagnetische Inhomogenitäten ; ferromagnetische Signaturen ; Schienenfahrzeug ; high accuracy velocity and position estimation ; ferromagnetic inhomogeneities ; ferromagnetic signatures ; rail vehicle ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 10
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    A computational multi-scale approach for brittle materials (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Materials of industrial interest often show a complex microstructure which directly influences their macroscopic material behavior. For simulations on the component scale, multi-scale methods may exploit this microstructural information. This work is devoted to a multi-scale approach for brittle materials. Based on a homogenization result for free discontinuity problems, we present FFT-based methods to compute the effective crack energy of heterogeneous materials with complex microstructures.
    Keywords: Effektive Rissenergie; FFT-basierte Homogenisierungsmethoden; Phasenfeld-Bruchmechanik; Minkowski-Tensoren; Fast-Marching-Methoden; Effective crack energy; FFT-based computational homogenization; Phase-field fracture; Minkowski tensors; Fast marching methods ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 11
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    Zur Wechselwirkung zwischen Fahrbahntextur und Laufstreifenmischung von Pkw-Reifen (2023)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work aims to gain an understanding of the interactions between tread compounds and surface texture on dry and wet road conditions. If, for example, a corundum surface, which is very well-established in the tire industry, is used on the tire test bench instead of a real track surface, for wet track conditions ranking inversions in the tested compounds occur.
    Keywords: PKW-Reifen; Laufstreifenmischung; Fahrbahntextur; Kraftübertragung; Passenger Car; Tire Tread Compound; Road Surface Texture; Traction ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 12
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    Bestimmung der thermischen Transporteigenschaften poröser Elektroden von Lithium-Ionen Batterien (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This contribution presents an analytical and a numerical model for predicting the effective thermal conductivity of porous electrode coatings as a function of microstructure parameters. Both models account for the morphological parameters and the thermal bulk materials of the constitutive cell components. The results of both models have been successfully verified against each other and validated with literature data as well as own experimental measurements.
    Keywords: thermal conductivity ; thermal transport properties ; porous electrodes ; lithium-ion cell ; lithium-ion battery ; Wärmeleitfähigkeit ; thermische Transporteigenschaften ; poröse Elektroden ; Lithium-Ionen Zelle ; Lithium-Ionen Batterie ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 13
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    Numerical prediction of curing and process-induced distortion of composite structures (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Fiber-reinforced materials offer a huge potential for lightweight design of load-bearing structures. However, high-volume production of such parts is still a challenge in terms of cost efficiency and competitiveness. Numerical process simulation can be used to analyze underlying mechanisms and to find a suitable process design. In this study, the curing process of the resin is investigated with regard to its influence on RTM mold filling and process-induced distortion.
    Keywords: Prozesssimulation ; Leichtbau ; Faserverbundwerkstoff ; Formfüllsimulation ; Bauteilverzug ; process simulation ; lightweight design ; composite ; mold-filling simulation ; process-induced distortion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 14
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    Modellierung der Mechanik und der effektiven Transporteigenschaften von partikulären Kathoden sowie deren Einfluss auf die elektrochemische Performance von Lithium-Ionen-Batterien (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: In the present work, lithium-ion battery cathodes and battery half-cells are numerically investigated. Of main interest is the influence of the calendering of an electrode during its manufacture on the mechanically induced changes in the microstructure and the resulting performance characteristics of a cell. In particular, the influence of varying particle shape and plastic material properties is considered.
    Keywords: Lithium-Ionen-Batterien ; Diskrete Elemente ; Mechanik ; Lithium-Ion-Batteries ; discrete elements ; mechanics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 15
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    Proceedings - 33. Workshop Computational Intelligence (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The workshop proceedings contain the contributions of the 33rd workshop "Computational Intelligence" which will take place from 23.11. - 24.11.2023 in Berlin. The focus is on methods, applications and tools for Fuzzy systems, Artificial Neural Networks, Evolutionary algorithms and Data mining methods as well as the comparison of methods on the basis of industrial and benchmark problems.
    Keywords: Modelling and Simulation; Fuzzy Systems; Artificial Intelligence; Maschine Learning; Modellierung und Simulation; Computational Intelligence; Fuzzy Systeme; Künstliche Intelligenz; Maschinelles Lernen ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English , German
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  • 16
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    Einfluss der Kompaktierung auf die Elektrodenmikrostruktur und elektrochemische Performance bei Lithium-Ionen-Zellen (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, the influence of compaction of LiNi1/3Co1/3Mn1/3O2 and graphite-based electrodes is characterized electrochemically at current rates between C/20 and 5C in a wide porosity range from uncompacted states to porosities 〈 20%. From the determined capacitances, gravimetric and volumetric considerations, among others, are presented in Ragone plots and correlated with the microstructural analysis findings.
    Keywords: Lithium-Ionen-Zellen ; Elektrodenfertigung ; Elektroden-Mikrostruktur ; elektrochemische Eigenschaften ; Lithium ion batteries ; electrode manufacturing ; electrode microstructure ; electrochemical properties ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 17
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    Einfluss des Dralls auf den Überschallnachlauf eines längsangeströmten zylindrischen Körpers (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This study investigates the effects of swirl on the supersonic wake of longitudinally-aligned axisymmetric afterbodies. The swirl was introduced upstream of the base corner by either spinning non-canted or non-spinning canted fins. Depending on the introduced swirl rate, both the experimental and numerical results show two distinctively different wake flow structures. The fluid-dynamic processes present in the rotating wakes and the resulting structural changes are analyzed in detail.
    Keywords: Überschallnachlauf ; Drall ; Wirbelaufplatzen ; Windkanalmessungen ; Numerische Simulationen ; supersonic wake flow ; swirl ; vortex breakdown ; wind-tunnel measurements ; numerical simulations ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 18
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    Proceedings of the 15th International Workshop on Beryllium Technology (BeWS-15) (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The 15th International Workshop on Beryllium Technology (BeWS-15) was held as a joint event combining BeWS-15 and industrial forum BeYOND-IX on September 14-15, 2022 in Karlsruhe, Germany with great success as a hybrid event. The workshop was organized by the Karlsruhe Institute of Technology. Participants came from Germany, the US, the UK, Kazakhstan, Latvia, Czech Republic, Japan, Sweden, France and China, totaling 55 persons, which was not expected immediately after the global pandemic.
    Keywords: fabrication of beryllides; neutron and ion irradiation; Fertigung von Legierungen aus Beryllium; Bestrahlung; Beryllium; safety; nuclear fusion; Kernfusion; beryllium; Sicherheit ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 19
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    Manufacturing-constrained multi-objective optimization of local patch reinforcements for discontinuous fiber reinforced composite parts (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: In this work, contributes to the optimization of local continuous fiber reinforcement patches, under consideration of manufacturing constraints. This approach requires specific optimization strategies. Therefore, an multi-objective optimization strategy for the placement of local reinforcement patches, under consideration of manufacturing constraints, has been developed. During the multi objective optimization, structural and process related objectives are considered.
    Keywords: Faserverbund ; Optimierung ; Fertigungsrandbedingungen ; Simulation ; composites ; optimization ; manufacturing constraints ; simulation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 20
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    Hybride und energieeffiziente Antriebe für mobile Arbeitsmaschinen (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This book contains the collected conference proceedings to the lectures of the 8th symposium on 23rd February 2021 in Karlsruhe. The state of research and new developments in the field of drive technology for mobile machines are reported in 11 articles. The conference proceedings are characterised by technical contributions on intelligent machine control systems, innovative electrical drives and development methods for off-highway vehicles.
    Keywords: Hybrid ; Antrieb ; Mobile Arbeitsmaschine ; Elektrifizierung ; Industrie 4.0 ; Drive Technology ; Mobile Machine ; Electrification ; Industry 4.0 ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 21
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    Experimental investigation and process simulation of the compression molding process of Sheet Molding Compound (SMC) with local reinforcements (2022)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: In this book, a new three-dimensional approach for the process simulation of SMC is developed. This approach takes into account both, the core layer that is dominated by the extensional viscosity and the thin lubrication layer. In order to transfer the information from the process to the structure simulation, a CAE chain is further developed. In addition, a new rheological tool is developed to analyze flow behavior experimentally and to provide the required material parameters.
    Keywords: Prozesssimulation; virtuelle Prozesskette; Materialcharakterisierung; SMC; process simulation; virtual process chain; material characterization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 22
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    Vibroakustische Analyse eines elektrischen Radnabenmotors und Optimierung durch geeignete Steuerungsansätze (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work deals with the mechanisms of disturbing noises at the electric wheel hub motor and describes a multiphysical model which simulates them. From this, countermeasures are derived and evaluated. A vibroacoustical optimized control approach, was developed and applied to the system. Furthermore, limitations and the interaction of the optimized control approach with the motor control are examined more detail.
    Keywords: elektrische Maschine; NVH; Akustik; HCI; Radnabenmotor; electric machine; acoustic; wheel hub motor ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 23
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    Consequences of hydroxyl generation by the silica/water reaction (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Water diffusing into silica surfaces gives rise for several effects on diffusion behaviour and mechanical properties. In a preceding booklet, we focused on diffusion and fiber strengths and deformations which were obtained by water soaking under external loading. In the present booklet we deal with results and interpretations of strength increase in the absence of applied stresses.
    Keywords: Quarzglas ; Schwellen ; Schädigung ; Diffusion ; Wasser/Quarzglas Reaktion ; Silica ; swelling ; damage ; diffusion ; water/silica glass reaction ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 24
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    Probabilistic Motion Planning for Automated Vehicles (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In motion planning for automated vehicles, a thorough uncertainty consideration is crucial to facilitate safe and convenient driving behavior. This work presents three motion planning approaches which are targeted towards the predominant uncertainties in different scenarios, along with an extended safety verification framework. The approaches consider uncertainties from imperfect perception, occlusions and limited sensor range, and also those in the behavior of other traffic participants.
    Keywords: Bewegungsplanung ; Planung unter Unsicherheiten ; Entscheidungsfindung ; Automatisiertes Fahren ; POMDP ; Motion Planning ; Planning under Uncertainty ; Decision-Making ; Automated Vehicles ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 25
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    Deep material networks for efficient scale-bridging in thermomechanical simulations of solids (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: We investigate deep material networks (DMN). We lay the mathematical foundation of DMNs and present a novel DMN formulation, which is characterized by a reduced number of degrees of freedom. We present a efficient solution technique for nonlinear DMNs to accelerate complex two-scale simulations with minimal computational effort. A new interpolation technique is presented enabling the consideration of fluctuating microstructure characteristics in macroscopic simulations.
    Keywords: deep material networks; data-driven modeling; Two-scale simulations; Deep Material Networks; Datengetriebene Modellierung; Zweiskalensimulationen; micromechanics; Mikromechanik; machine learning; Maschinelles Lernen ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 26
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    Simulation of the thermoforming process of UD fiber-reinforced thermoplastic tape laminates (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, initially, the requirements on a simulation model of the non-isothermal stamp forming process of unidirectional fiber-reinforced, and thermoplastic tape laminates are investigated experimentally. On this basis, different isothermal as well as a fully coupled thermomechanical simulation model under consideration of the crystallization kinetics are developed. For validation, a complex shaped geometry is simulated and compared to experimental forming results.
    Keywords: Prozesssimulation ; Umformung ; UD tape ; Finite Elemente Analyse ; thermoplastisch ; process simulation ; forming ; Finite Element Analysis ; thermoplastic ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 27
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    Entwicklung einer Kontinuumsbeschreibung für die Versetzungsmobilität in Versetzungsnetzwerken (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work deals with the homogenization of dislocation reactions across slip systems in a physically based three-dimensional formulation of metal plasticity. Based on comparisons with discrete dislocation dynamics simulations, a description of dislocation networks is developed. Thereby, strain hardening is achieved as a consequence of the evolution of dislocation networks, which in turn results from an interaction of plastic slip and physical mechanisms.
    Keywords: Werkstoffsimulation ; plastische Verformung von Metallen ; physikalisch-basierte Kontinuumsbeschreibung ; Versetzungsnetzwerke ; Versetzungsdynamik ; material simulation ; plastic deformation of metals ; physically-based continuum formulation ; dislocation networks ; dislocation dynamic ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 28
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    Belief State Planning for Autonomous Driving (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work presents a behavior planning algorithm for automated driving in urban environments with an uncertain and dynamic nature. The algorithm allows to consider the prediction uncertainty (e.g. different intentions), perception uncertainty (e.g. occlusions) as well as the uncertain interactive behavior of the other agents explicitly. Simulating the most likely future scenarios allows to find an optimal policy online that enables non-conservative planning under uncertainty.
    Keywords: Autonomes Fahren ; Entscheidungsfindung ; Verhaltensgenerierung ; Trajektorienplanung ; Interaktion ; Autonomous Driving ; Decision Making ; Behavior Planning ; Trajectory Planning ; Interactive Planning ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 29
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    Trajectory optimization based on recursive B-spline approximation for automated longitudinal control of a battery electric vehicle (2024)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work describes a method for weighted least squares approximation of an unbounded number of data points using a B-spline function. The method can shift the bounded B-spline function definition range during run-time. The approximation method is used for optimizing velocity trajectories for an electric vehicle with respect to travel time, comfort and energy consumption. The trajectory optimization method is extended to a driver assistance system for automated vehicle longitudinal control.
    Keywords: vehicle longitudinal control; Kalman filter; approximation; B-spline; trajectory optimization; Fahrzeuglängsführung; Kalmanfilter; Approximation; B-Spline; Trajektorienoptimierung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Grundlagenuntersuchungen an intrinsisch gefertigten lasttragenden FVK/Metall-Hybridträgern (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Both types of hybrids are tested and compared in terms of their mechanical properties in quasi-static, dynamic and cyclic three-point bending tests in reference to their damage behaviour. The intrinsic hybrid structures bear approximately a 20% higher maximum force at all load cases investigated and are less prone to mechanical, thermal and corrosive pre-damage.
    Keywords: Hybridwerkstoffe ; Fügen ; Bauteilnahe Beanspruchung ; Hybridmaterials ; Joining ; Near service loads ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 31
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    Hybride und energieeffiziente Antriebe für mobile Arbeitsmaschinen (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This book contains the conference proceedings to the lectures of the 9th symposium on 28th February 2023 in Karlsruhe. The state of research and new developments in the field of drive technology for mobile machines are reported in 12 articles. The conference proceedings are characterized by technical contributions on climate-neutral, efficiency-optimized and electrified drives in a variety of machines. In addition to traction drives, drive systems for performing work tasks are also addressed.
    Keywords: Hybrid; Antrieb; Mobile Arbeitsmaschine; Elektrifizierung; Klimaneutrale Antriebe; Drive Technology; Mobile Machine; Electrification; Climate-neutral drives ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Consequences of hydroxyl generation by the silica/water reaction (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Water diffusing into silica surfaces gives rise for several effectson diffusion behaviour and mechanical properties. Water added to silica glass increases its specific volume so that the silica expands near the surface. Mechanical boundary conditions give rise for compressive “swelling stresses”. This fact provides a tool for the interpretation of many experimental observations from literature.
    Keywords: Quarzglas ; Hydroxylbildung ; Schwellen ; Diffussion ; Wasser/Quarzglas Reaktion ; silica ; silica/water reaction ; swelling ; diffusion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 33
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    Entwicklung und Charakterisierung von Siliziumnitrid-/Siliziumkarbidkompositen für den Einsatz in tribologisch hochbeanspruchten Gleitsystemen (2023)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, silicon nitride/silicon carbide composites are manufactured and characterized for tribologically highly stressed applications. The characterization of the composite materials shows the influence of the silicon carbide content on the resulting microstructure and the mechanical properties. The friction properties of the composite materials were characterized in tribological experiments. The composites show very good friction and wear behavior.
    Keywords: Siliziumnitrid ; Siliziumkarbid ; technische Keramik ; keramische Prozesstechnik ; Tribologie ; silicon nitride ; silicon carbide ; technical ceramics ; ceramic process technology ; tribology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 34
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    Kinematische Tätigkeitsanalyse (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The assessment of perceived exertion is highly relevant for workplace design to improve the quality of work. This approach represents an objective method based on kinematic data. The method's objective was to determine the feasibility of using the time derivative of acceleration - jerk - as an indicator of time of increased physical exertion (TIPE). The result showed that the jerk data peaks' height and frequency are useful indicators for identifying physical exertion.
    Keywords: Ruck; körperliche Beanspruchung; Anstrengung; Ergonomie; Arbeitsplatzgestaltung; repetitive Tätigkeiten; Arbeitswissenschaft; Jerk; physical exertion; perceived exertion; ergonomics; workplace design; repetition task; human factors ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 35
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    Objektivierung des Schwingungskomforts schwerer Nutzfahrzeuge (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: A time efficient development process of new trucks includes an early development of ride comfort before real prototypes exist. Therefore it is necessary to determine objective and measurable characteristic values to predict the subjectively percepted ride comfort from measurement or simulation results. The aim of this work is the determination of objective characteristic values for three selected vibration phenomena and the prediction of their subjective evaluations.
    Keywords: Schwingungskomfort ; Objektivierung ; LKW ; Maskierungseffekte ; Schwingungswahrnehmung ; ride comfort ; objectification ; heavy duty truck ; masking effects ; human vibration perception ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 36
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    Methode zur Bewertung der Zuverlässigkeit der elektrischen Energieversorgung in der automobilen Vorentwicklung (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: With the introduction of highly automated assistance systems in passenger cars, the requirements for the reliability of the electrical power supply increase significantly. In this thesis, a method for evaluating the reliability of the electrical power supply in automotive pre-development is presented and applied. As a result, it could be shown that the classical electrical power supply is not suitable for supplying highly automated assistance systems.
    Keywords: pre-development; Vorentwicklung; energy supply; Reliability; Zuverlässigkeit; Energieversorgung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 37
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    Proceedings - 31. Workshop Computational Intelligence : Berlin, 25. - 26. November 2021 (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The proceedings of the 31st Workshop on Computational Intelligence focus on methods, applications, and tools for fuzzy systems, artificial neural networks, deep learning, system identification, and data mining techniques.
    Keywords: Maschinelles Lernen ; Deep Learning ; Computational Intelligence ; Künstliche Intelligenz ; Neuronale Netze ; Maschine Learning ; Artificial Intelligence ; Neural Networks ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 38
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    Diffusionseigenschaften von Nickel in einer Festoxid-Brennstoffzelle (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, thermal grooving experiments were performed on anode microstructures, Ni polycrystals and Ni bicrystals. The grain boundary grooves were measured by means of an AFM. The results provide for the first time reliable values as well as the complete anisotropy of the relevant material parameters - the relative grain boundary energies and the surface diffusion coefficients - of nickel under realistic operating conditions of an SOFC anode.
    Keywords: solid oxide fuel cell ; grain boundary energy ; Festoxid-Brennstoffzelle ; SOFC ; Nickel ; Diffusion ; Korngrenzenergie ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 39
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    Entwicklung von Siebdruckpasten zur Herstellung von Glaslotfügungen für die Festoxidbrennstoffzelle (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Solid oxide fuel cells are used to generate electricity from various fuel gases. The sealants between the stack-components should be gas-tight, mechanically stable and insulating. This work shows that glass ceramics can be used as sealant material for fuel cells. Solvent- and water-based suspensions are made from alkaline earth silicate glass and thick layers are produced using the screen-printing process. To demonstrate the applicability, they are soldered between steel and ceramic substrates.
    Keywords: Glaskeramik ; Festoxidbrennstoffzelle ; Siebdruck ; Rheologie ; glass ceramics ; solid oxide fuel cell ; screen printing ; rheology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 40
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    Experimentelle und numerische Analyse des Körperschallübertragungsverhaltens von Aggregatelagerelementen im akustisch relevanten Frequenzbereich (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The structure-borne sound transmission properties of hydraulic and conventional engine mounts is analyzed experimentally and numerically in a acoustically relevant frequency range. In order to do so, first of all a test bench environment for analyzing the dynamic sound transmission properties is presented. In subsequent steps the main influence parameters on the transmission properties are determined experimentally and numerically.
    Keywords: Akustik; Körperschall; Aggregatelager; Schall; acoustics; Structure borne noise; engine mount; noise ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Proceedings - 32. Workshop Computational Intelligence: Berlin, 1. - 2. Dezember 2022 (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This conference volume contains the contributions of the 32nd workshop "Computational Intelligence" of the Technical Committee 5.14 of the VDI/VDE Society for Measurement and Automation Technology (GMA) of 1.12. – 2.12.2022 in Berlin. The focus is on methods, applications and tools for.
    Keywords: Computational Intelligence ; Maschinelles Lernen ; Deep Learning ; Fuzzy Systeme ; Datenanalyse ; Machine Learning ; Fuzzy Systems ; Data Mining ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 42
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    Entwicklung keramischer Vergussmassen mit Alkoxysilanen zur Steigerung der Haftfestigkeit (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The adhesion of encapsulation materials is an dendrimental factor for the robustness and functionality of a power electronic device. In this work the adhesion of ceramic potting materials was developed. A new primer was invented, that enabled high shear strengths even at high temperatures for short times. Furthermore, a completely new potting material was invented on the basis of alkoxysilanes. Especially MTES showed beneficial properties for the adhesion under temperature load.
    Keywords: Vergussmasse; Scherfestigkeit; Primer; Alkoxysilan; Leistungselektronik; Potting Material; Shear Strength; Alkoxysilane; Power Electronics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 43
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    Multi-field modeling and simulation of fiber-reinforced polymers (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work proposes a new numerical approach for analyzing the behavior of fiber-reinforced materials, which have gained popularity in various applications. The approach combines theories and methods to model the fracture behavior of the polymeric matrix and the embedded fibers separately, and includes a modified plasticity model that considers the temperature-dependent growth of voids. Tests are conducted to explore different types and sequences of failure in long fiber-reinforced polymers.
    Keywords: duktiler Bruch ; faserverstärkte Materialien ; Verbundwerkstoff ; Phasenfeld ; Plastizität ; ductile fracture ; fiber-reinforced materials ; composite ; phase-field ; plasticity ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 44
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    Langzeitstabilität der Innendrücke von Kavernen benachbarter MEMS-Sensoren auf Siliziumbasis (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Due to a trend towards miniaturization of many MEMS devices and thus also the cavity volumes of inertial sensors, the influence of slight changes in the damping atmosphere in sensor cavities on the reliability of the sensors is increasing. In this work, mechanisms affecting the pressure stability of gyroscopes are investigated and countermeasures are presented. A focus is placed on desorption sources as well as gas diffusion paths in the sensor layer stack.
    Keywords: MEMS-Sensor ; Drehratensensor ; Inertialsensor ; Dämpfung ; Q-Faktor ; MEMS sensor ; gyroscope ; inertial sensor ; damping atmosphere ; Q factor ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 45
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    Road Condition Estimation with Data Mining Methods using Vehicle Based Sensors (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The work provides novel methods to process inertial sensor and acoustic sensor data for road condition estimation and monitoring with application in vehicles, which serve as sensor platforms. Furthermore, methods are introduced to combine the results from various vehicles for a more reliable estimation.
    Keywords: Maschinelles Lernen ; Fahrzeugtechnik ; Straßenschäden ; Fahrzeugsensorik ; Maschine Learning ; Vehicle Technology ; Road Condition ; Vehicle Sensors ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 46
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    Thermodynamik von Kobaltoxid Anodenmaterialien für Lithium-Ionen-Batterien und ihr elektrochemisches Verhalten (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: A thermodynamic approach is used to gain new insights into reaction mechanism and correlations between electrochemical and thermodynamic properties of conversion electrodes in the material system Li-Co-O. For this purpose, thermodynamic modeling using the CALPHAD method as well as measurements of the thermodynamic and electrochemical properties of the electrode materials were performed.
    Keywords: Lithium-Ionen-Batterien ; Konversionselektroden ; Co3O4 ; Thermodynamische Eigenschaften ; Lithium-Kobaltoxide ; Lithium-Ion-Battery ; conversion electrodes ; thermodynamic properties ; lithium-cobalt oxides ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 47
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    Stochastic Range Estimation Algorithms for Electric Vehicles using Data-Driven Learning Models (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work aims at improving the energy consumption forecast of electric vehicles by enhancing the prediction with a notion of uncertainty. The algorithm itself learns from driver and traffic data in a training set to generate accurate, driver-individual energy consumption forecasts.
    Keywords: Elektromobilität ; Vorhersagen ; Algorithmen ; Fahrzeugtechnik ; Energiemanagement ; E-Mobility ; Forecasting ; Algorithms ; Vehicle Technology ; Energy Management ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 48
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    Multiskalige Modellierung von Lithium-Ionen-Batterien (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, model approaches for the internal processes of large-format lithium-ion batteries are developed, experimentally parameterized, and validated. The electrochemical losses in the electrode’s microstructure are investigated as well as their interaction with the heterogeneous potential and temperature distribution of large-format cells. In addition, permissible operating conditions of the cells are identified as well as potentials with regard to increasing power and energy density.
    Keywords: Batterie; Lithium-Ionen-Batterie; Modellierung; Multiskalenmodell; Simulation; Charakterisierung; Multiskalen Modell; battery; lithium-ion battery; modeling; multiscale model; simulation; characterization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 49
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    Ganzheitliche Optimierung einer Axialkolbenpumpe durch bedarfsangepasste Entlastung tribologischer Kontakte (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Swash plate axial piston pumps are used in various industrial & mobile applications. An optimization of this displacement principle can be achieved by the active influence of the hydrostatic relief in tribological contacts.The approach addressed in this work is a characteristic field-based pressure control of pressure reservoirs, which can be used to adjust the degree of relief of the individual contact surfaces according to the operating point.
    Keywords: Axialkolbenpumpe; Tribologie; Hydrostaten; Verdängereinheiten; Hydraulik; Axial piston pump; tribology; hydrostat; displacement pump; hydraulic ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 50
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    Indirekte Schätzung des Fahrbahnnässegrads zur Detektion von gefährlichen Fahrzuständen (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: An estimation of the road wetness level supports the driver as well as the vehicle to maneuver safely. This study presents the fundamentals of a system that uses structure-borne sound measurements at various positions on the vehicle to detect the water spraying up from the tires and uses this information to estimate the degree of road wetness. The system finds its first application in the Porsche 911, Type 992.
    Keywords: Fahrbahnnässe; Fahrzeugsicherheit; Wasseraufwirbelung; Road wetness; Vehicle safety; Tire splash and spray ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 51
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    Methodik für Wissens- und Prozessmanagement bei der interaktiven kollaborativen Montage variantenreicher Produkte (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Collaboration-oriented knowledge and process management must support the integration of all systems involved, address specific questions of the division of labor within the control system, but also enable the planning and engineering of new variants and contribute to a continuous increase in quality through the persistence and analysis of process data.
    Keywords: Informationsmanagement ; Robotik ; Cobot ; Montage ; Kollaboration ; Information Management ; Robotics ; Assembly ; Collaboration ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Entwicklung und Evaluierung einer Kommunikationsgestützten Lokalisierung (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The content of this work is the development of a localization system, which enables several driverless transport vehicles to navigate locally in a highly flexible and free way. The ceiling mounted sensor system detects and analyzes objects within the field of view. The detected properties of all objects are made available via an interface and enable vehicles to identify themselves and navigate freely without a sensor mounted on the vehicle.
    Keywords: Lokalisierung; fahrerlose Transportfahrzeuge; 3D-Kamera; Objekterkennung; Kommunikation; Localization; automated guided vehicles; 3D camera; object recognition; communication ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Development of a CO2e quantification method and of solutions for reducing the greenhouse gas emissions of construction machines (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work focuses on the development of a quantification method for GHG (CO2e) emissions from construction machines. The method considers CO2e reduction potentials in the time past-present–future, through influencing factors from six pillars: Machine efficiency, process efficiency, energy source, operating efficiency, material efficiency and CCS. In addition, transformation solutions are proposed to reduce GHG emissions from construction machines like liquid methane, fuel cell drive or CCS.
    Keywords: CO2; bauprozess; Baumaschinen; CCS; Alternative Antriebe; Construction process; construction equipment; alternative powertrains ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Numerische Modellierung und Simulation von bleifreien Relaxor-Ferroelektrikum-Kompositen (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The electromechanical behavior of two new sodium bismuth titanate based lead-free ferroelectric materials as well as bilayer composites are investigated in experiments and numerical simulations. For the Finite-Element-Method, a fully coupled, three dimensional ferroelectric constitutive model is developed. In a parameter study, the electromechanical coupling of bilayer composite is optimized.
    Keywords: Finite-Elemente-Simulation ; Piezoelektrizität ; Ferroelektrizität ; bleifreie Ferroelektrika ; Piezoelectricity ; Ferroelectricity ; Lead-Free Ferroelectrics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Registrierende Härtemessung an neutronenbestrahlten Materialien bei hohen Temperaturen (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The present work investigates neutron-irradiated EUROFER97 by high-temperature indentation. Before, a test procedure is defined for the prototype device Karlsruhe high-temperature indenter. The procedure leads to a quality of the test results at high temperatures comparable to commercial devices at room temperature. The results contribute to a better understanding of structural materials of future fusion reactors.
    Keywords: Fusion ; Strukturmaterialien ; Härte ; Neutronenschäden ; Hochtemperatur ; Hardness ; High-temperature ; structural materials ; Neutron-induced defects ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 56
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    Optimizing photocatalysts and photoreactors for solar fuel synthesis (2024)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The work represents a toolbox for the design of a highly efficient photocatalytic process for solar-driven synthesis. The focus is the optimization of photoreactors and photocatalysts. The described photoreactor design strategy is based on numerical methods mapping radiation transport and additive manufacturing delivering prototypes. The photocatalyst engineering is based on suitable photocatalyst support strategies and a method for the determination of the quantum yield in photoreactions.
    Keywords: photocatalyst; photoreactor; photoreaction engineering; solar fuels; Artificial photosynthesis; Fotokatalysator; Fotoreaktor; Fotoreaktionstechnik; Solare Kraftstoffe; Künstliche Fotosynthese ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Experimental investigation of relevant road surface descriptors for tire-road noise measurements on low-absorbing road surfaces (2024)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Ihrer Arbeit in der Originalsprache: This work aims at identifying relevant road surface characteristics to mitigate tire-road noise of free-rolling tires using a systematic approach. As using open porous roads is already known as an efficient measure to reduce tire rolling noise, this study will focus on compact road surfaces which have a low acoustic absorption. Measurements on standardized ISO 10844 test tracks and on public roads are used to study the norm's representativity and its completeness.
    Keywords: Groove Resonance; Road surface characteristics; Tire-Road Noise; Rillenresonanz; ISO 10844; Fahrbahneigenschaften; Reifen-Fahrbahn-Geräusch ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 58
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    On the Electro-Chemo-Mechanical Coupling in Solid State Batteries and its Impact on Morphological Interface Stability (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Solid state batteries with a lithium metal electrode are considered the next generation of high energy battery technology. Unfortunately, lithium metal is prone to harmful protrusion or dendrite growth which causes dangerous cell failure. Within this work the problem of protrusion growth is tackled by deriving a novel electro-chemo-mechanical theory tailored for binary solid state batteries which is then used to discuss the impact of mechanics on interface stability by numerical studies.
    Keywords: Festkörperbatterie ; Modellierung ; Dendriten ; Stabilität ; Solid state battery ; modeling ; dendrite ; stability ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Deep Reinforcement Learning zur Steigerung von Energieeffizienz und Pünktlichkeit von Straßenbahnen (2023)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work investigates how the energy efficiency and punctuality of streetcars can be increased by using AI. The AI is trained on two scenarios at three traffic times each. The determined driving profiles are compared with those of drivers from regular passenger operation as well as with a theoretical optimum determined by Dynamic Programming. In addition, transfer learning capabilities of the AI will be investigated.
    Keywords: Straßenbahn; KI; Energie; effizienz; Pünktlichkeit; Modellierung; Light Rail; AI; Energy Efficiency; Punctuality; Modelling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Herstellung dünner Folien aus Lithium-Lanthan-Titanat zur Anwendung als Festkörperelektrolyt (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work the production of a thin film of lithium lanthanum titanate by tape casting for use in a lithium ion solid state battery is described. The influence of the composition of the slip on its flow properties is investigated. The layers produced are characterized both individually and in connection with a composite anode made of lithium titanate. Their suitability for use in a solid-state battery is demonstrated.
    Keywords: Keramik ; Foliengießen ; Festkörperelektrolyt ; Lithium-Ionen-Batterie ; Lithium-Lanthan-Titanat ; ceramics ; tape casting ; solid electrolyte ; lithium ion battery ; lithium lanthanum titanate ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Werkzeug- und Prozessentwicklung des Roll-to-Roll-Hochdurchsatzverfahrens zur kontinuierlichen, großflächigen Mikrostrukturierung (2022)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work describes the set-up of a roll-to-roll (R2R) system and the development of a specific microstructuring process for a variety of different materials ranging from high-performance polymers and low-melting-point metals to glass nanocomposites and thermoplastic nonwovens, including a lithography and electroplating-based semi-automated tooling production for seamless R2R microreplication.
    Keywords: Roll-to-Roll; Heißprägen; Mikrostruktur; Lithographie; Galvanik; roll-to-roll; thermal nanoimprint; microstructure; lithography; electroplating ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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  • 62
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    Automatische Erzeugung langzeitverfügbarer Punktmerkmalskarten zur robusten Lokalisierung mit Multi-Kamera-Systemen für automatisierte Fahrzeuge (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Automated vehicles heavily rely on accurate self-localization to operate safely and efficiently in dynamic road traffic scenarios. In this work, an iterative and robust approach to create highly accurate maps comprising any number of drives of arbitrary length with constant computation complexity is proposed. Furthermore, a high-precision self-localization method using multiple cameras covering the surrounding environment is presented.
    Keywords: SLAM ; Automatisiertes Fahren ; Fahrzeugsehen ; Umweltwahrnehmung ; Lokalisierung ; Automated Driving ; Machine Vision ; Environment Perception ; Mapping and Localization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Microstructure generation and micromechanical modeling of sheet molding compound composites (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: We introduce an algorithm that allows for a fast generation of SMC composite microstructures. An exact closure approximation and a quasi-random orientation sampling ensure high fidelity. Furthermore, we present a modular framework for anisotropic damage evolution. Our concept of extraction tensors and damage-hardening functions enables the description of complex damage-degradation. In addition, we propose a holistic multiscale approach for constructing anisotropic failure criteria.
    Keywords: Mikrostruktur; Modellierung; Schädigung; SMC; Komposit; Microstructure; Modeling; Damage; Composite ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Efficient fast Fourier transform-based solvers for computing the thermomechanical behavior of applied materials (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The mechanical behavior of many applied materials arises from their microstructure. Thus, to aid the design, development and industrialization of new materials, robust computational homogenization methods are indispensable. The present thesis is devoted to investigating and developing FFT-based micromechanics solvers for efficiently computing the (thermo)mechanical response of nonlinear composite materials with complex microstructures.
    Keywords: Mikromechanik; Homogenisierung; Rechnergestützte Mechanik; Nichtlineare Optimierung; Themomechanik; Micromechanics; homogenization; computational mechanics; nonlinear optimization; thermomechanics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Vorausschauende Regelung von Fahrzeugsystemen durch stochastische Vorhersage der Fahrzeugdynamik (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Predictive control of vehicle systems often requires application of forecasting models. In this work a stochastic framework for generating forecasts of vehicle dynamics is proposed, to directly address uncertainty within the control algorithms. Building on this framework, the predictive control of vehicle systems with stochastic optimal control algorithms is investigated, implemented and evaluated for two exemplary vehicle systems.
    Keywords: mpc ; driver behavior ; vehicle system ; forecast ; predictive control ; MPC ; Fahrerverhalten ; Fahrzeugsystem ; Vorhersage ; Vorausschauende Regelung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Dynamisches Bremsverhalten des Reifen-Fahrwerk-Systems (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In the frame of this research work, a complete tyre suspension brake system, which includes a McPherson strut and a modified ABS hydro aggregate is analyzed, developed and optimized on the inner drum test bench and studied using different tyres as well as under various road and braking excitations. By direct control of each interior magnet valve in the ABS hydro aggregate by a real time computer, complex brake slopes as well as various ABS control concepts are implemented on the test bench.
    Keywords: Bremsverhalten ; Reifen ; Fahrwerk ; ABS ; Optimierte Ansteuerung ; Braking behavior ; tyre ; chassis ; Optimized control ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Modellierung und Optimierung der strömungstechnischen Vorgänge in Abweiseradsichtern (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Centrifugal classifiers are processing machines used in the gas-particle classification. The aim of this work is to reduce energy costs by improving the classification properties and reducing the pressure drop. In addition to design measures, the focus is also on model development. For the development of the models, a deeper understanding of the flow processes is required.
    Keywords: Gas-Partikel-Klassierung ; Abweiseradsichter ; Mathematische Modellierung ; Numerische Simulation ; Optimierung ; Gas particle separation ; Centrifugal Classifier ; Mathematical Modeling ; Numerical Simulation ; Optimization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Nanoskalige Analytik der Mikrostruktur von hochdosig bestrahltem Beryllium (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The aim of the present work is to develop an in-depth understanding of the microstructural changes in neutron-irradiated beryllium. In particular, it aims to reveal the precise mechanisms leading to the observed tritium retention.Both, helium and tritium could be detected for the first time by high-resolution electron energy loss spectroscopy (EELS) within bubbles in the grain interior as well as along grain boundaries.
    Keywords: Beryllium ; Wasserstoff ; Mikrostruktur ; EELS ; Bestrahlung ; beryllium ; hydrogen ; microstructure ; irradiation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Modellfreies Lernen optimaler zeitdiskreter Regelungsstrategien für Fertigungsprozesse mit endlichem Zeithorizont (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The quality and performance of components is largely determined by the execution of the manufacturing processes involved. The process result depends -- in addition to the initial state of the component and the process -- on the course of the process. In many manufacturing processes, the course of the process can be decisively determined by manipulated variables that change over time. This work deals with methods to optimize these time-varying quantities under fluctuating process conditions. The quality of components depend to a large extent on the execution of the industrial processes involved in manufacturing. In addition to the initial conditions of the component and the process, the process result depends on the course of the process, which often can be significantly determined by time-varying manipulated variables. Methods for the optimization of these time-dependent quantities with regard to the component quality and depending on process conditions is the subject of this work.
    Keywords: Maschinelles Lernen; Entscheidungsoptimierung; Bestärkendes Lernen; Prozesspfadoptimierung; Optimale Regelung; machine learning; reinforcement learning; decision optimization; process optimization; optimal control ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Development of a modular Knowledge-Discovery Framework based on Machine Learning (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, a novel knowledge discovery framework able to analyze data produced in the Gasoline Direct Injection (GDI) context through machine learning is presented and validated. This approach is able to explore and exploit the investigated design spaces based on a limited number of observations, discovering and visualizing connections and correlations in complex phenomena. The extracted knowledge is then validated with domain expertise, revealing potential and limitations of this method.
    Keywords: Gasoline Direct Injection; Data-Driven Development; Machine Learning Application; Datengetriebene Entwicklung; Anwendung des Maschinellen Lernens; Knowledge Discovery; Benzin-Direkteinspritzung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Entwicklung einer Methode zum Einsatz von Reinforcement Learning für die dynamische Fertigungsdurchlaufsteuerung (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work aims to develop a method that can reschedule the matrix production in the case of a disruption. For this purpose, different artificial intelligence methods are combined in a novel way. The developed method is validated on a theoretical and a real scheduling case.
    Keywords: Produktionssteuerung; Reinforcement Learning; Künstliche Intelligenz; Terminierung; Production control; artificial intelligence; scheduling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Modellierung mehrkomponentiger Materialsysteme für die Phasenfeldmethode und Analyse der simulierten Mikrostrukturen (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, the solidification process of the high-temperature materials NiAl-34Cr und Nb-Si is investigated with the phase-field method. This work includes an entire investigation chain from the modeling of the material systems to the conduction of representative phase-field simulations, and finally to the analyzation of the resulting microstructures.
    Keywords: Phasenfeldsimulationen ; Modellierung ; gerichtete Erstarrung ; Mikrostrukturanalyse ; Phase-field Simulation ; Modeling ; Directional Solidification ; Microstructure analysis ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Adaptive Fahrhinweise für ein längsdynamisches Fahrerassistenzsystem zur Steigerung der Energieeffizienz (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In this work, the author developed driver advices, that help the driver to perform his driving task in an efficient way. This advices are classified as a driver assistance system. They have been implemented and their influence on the driver has been investigated during a case study.
    Keywords: Fahrerassistenzsysteme ; Automobil ; Fahrhinweise ; Driver Assistance Systems ; Automotive ; Driver Advices ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Mechanische und Strömungsmechanische Topologieoptimierung mit der Phasenfeldmethode (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In engineering work, the optimization of the microstructure of a material, of mechanically loaded components and of components influencing the flow behaviour is important. Understanding the behavior of flows in geological structures can be used to optimize the design of geothermal power plants. In this thesis, methods from continuum mechanics, fluid mechanics and the phase field method are presented for the optimization of such processes and examples of optimizations are shown.
    Keywords: Kontinuumsmechanik ; Strömungsmechanik ; Phasenfeldmethode ; Topologieoptimierung ; continuum mechanics ; fluid mechanics ; phase field method ; topology optimization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    NMR micro-detectors tailored for multinuclear and electrochemistry lab-on-a-chip applications (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work offers three solutions tailored to specific applications to overcome NMR challenges in the micro-domain. As the first sub-topic of this work, different potential electrode designs, compatible with NMR technique, are suggested and experimentally evaluated. As the second focus point, this work tackles multinuclear detection challenges. In parallel, a low-cost, broadband insert is discussed to enhance the sensitivity of standard NMR coils when a small sample volume is available.
    Keywords: Broadband ; NMR sensor ; Micro-coil ; MEMS ; MRI ; NMR ; Kernresonanzspektroskopie ; Magnet-Resonanz-Tomographie ; Mikrospule ; Sensor ; Breitband ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.
    Keywords: Bifurkationsanalyse ; Fluidschmierung ; Rotordynamik ; Thermodynamik ; Tribologie ; Bifurcation Analysis ; Fluid Film Lubrication ; Rotor Dynamics ; Thermodynamics ; Tribology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Mesoscale simulation of the mold filling process of Sheet Molding Compound (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Sheet Molding Compounds (SMC) are discontinuous fiber reinforced composites that are widely applied due to their ability to realize composite parts with long fibers at low cost. A novel Direct Bundle Simulation (DBS) method is proposed in this work to enable a direct simulation at component scale utilizing the observation that fiber bundles often remain in a bundled configuration during SMC compression molding.
    Keywords: Sheet Molding Compound ; Fließpressen ; Prozesssimulation ; CoDiCoFRP ; Compression Molding ; Process simulation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Fiber-dependent injection molding simulation of discontinuous reinforced polymers (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work presents novel simulation techniques for injection molding of fiber reinforced polymers. These include approaches for anisotropic flow modeling, hydrodynamic forces from fluid on fibers, contact forces between fibers, a novel fiber breakage modeling approach and anisotropic warpage analysis. Due to the coupling of fiber breakage and anisotropic flow modeling, the fiber breakage directly influences the modeled cavity pressure, which is validated with experimental data.
    Keywords: Spritzgusssimulation ; anisotropes Fließen ; Faserbruch ; Faserkräfte ; Verzugsanalyse ; injection molding simulation ; anisotropic flow ; fiber breakage ; fiber forces ; warpage analysis ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Örtliches Auslegungskonzept gegen Pittingversagen bei randschichtgehärteten Zahnrädern (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The current design of gears against pitting fatigue is based on simple physical models in combination with empirically determined factors. In contrast to that, this work presents a new design concept against pitting fatigue which is based on local quantities and allows a more detailed consideration of different influence parameters on the expected pitting life.
    Keywords: Pitting; Grübchenbildung; Zahnradermüdung; Zahnradberechnung; örtliches Auslegungskonzept; gear fatigue; gear design; local fatigue concept ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Verhaltensentscheidung für automatisierte Fahrzeuge mittels Arbitrationsgraphen (2024)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work proposes a system architecture for secure and robust behavioral decision-making for automated vehicles. It assembles basic behavior blocks in a hierarchical arbitration graph and ensures safety through verification and diverse levels of fallback. The presented method contributes to a transparent and comprehensible decision-making process and produces safe and stable driving behavior even at high failure rates.
    Keywords: safety verification; automated driving; hierarchical arbitration graphs; behaviour planning; decision-making; Verifikation; automatisiertes Fahren; hierarchische Arbitrationsgraphen; Verhaltensplanung; Verhaltensentscheidung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Decentralized Scheduling of Discrete Production Systems with Limited Buffers (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Modern production systems have become more flexible and agile. For them, a suitable control and planning method is needed. Agent-based systems offer the required characteristics. The contributions of these work are a remodeling of the Shifting Bottleneck heuristic to include limited buffers, the development of a decentralized multi-agent system for production planning, and the adaptation of the heuristic to the agent system. It concludes with evaluations of real-world production systems.
    Keywords: Produktionsplanung; Dezentral; Limitierte Puffer; Ablaufplanung; Multi-Agenten-System; Production Planning; Decentral; Limited Buffer; Scheduling; Multi-Agent System ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Modeling transport properties and electrochemical performance of hierarchically structured lithium-ion battery cathodes using resistor networks and mathematical half-cell models (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of cathode structures on the performance of the whole cell, efficient tools for calculating effective transport properties of granular systems are developed and their influence on the electrochemical performance is investigated in specially adapted cell models.
    Keywords: Hierarchisch strukturierte Kathoden; Widerstand-Netzwerk-Methoden; Zellmodellierung; Effektive Transporteigenschaften; Hierarchically structured cathodes; Resistor network methods; Cell modeling; Effective transport parameters ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Ein Beitrag zur asymptotischen Analyse der hydraulischen Ventilsteuerungen (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: A method based on the singular perturbation theory and the averaging method is developed for the dynamic analysis of hydraulic valves. Periodic solutions are calculated and stability is analyzed under the influence of non-smooth phenomena. Based on this analysis, reduced models are developed, which exhibit significantly improved computational time efficiency, both in the simulation of non-stationary motions as well as in nonlinear valve control.
    Keywords: hydraulisches Druckregelventil; singulär gestörtes System; nichtlineare Dynamik; nicht-glatte Dynamik; Regelung; hydraulic pressure control valve; singularly perturbed system; nonlinear dynamics; non-smooth dynamics; control ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Measurable Safety of Automated Driving Functions in Commercial Motor Vehicles (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: With the further development of automated driving, the functional performance increases resulting in the need for new and comprehensive testing concepts. This doctoral work aims to enable the transition from quantitative mileage to qualitative test coverage by aggregating the results of both knowledge-based and data-driven test platforms. The validity of the test domain can be extended cost-effectively throughout the software development process to achieve meaningful test termination criteria.
    Keywords: automatisiertes Fahren; Nutzfahrzeuge; Testmethoden; Stichprobenverfahren; messbare Sicherheitsvorhersage; automated driving; commercial motor vehicles; test methods; sampling methods; measurable safety prediction ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Modeling martensitic phase transformation in dual phase steels based on a sharp interface theory (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Martensite forms under rapid cooling of austenitic grains accompanied by a change of the crystal lattice. Large deformations are induced which lead to plastic dislocations. In this work a transformation model based on the sharp interface theory, set in a finite strain context is developed. Crystal plasticity effects, the kinetic of the singular surface as well as a simple model of the inheritance from austenite dislocations into martensite are accounted for.
    Keywords: Martensit ; Phasentransformation ; sharp interface ; Kinetik ; martensite ; phase transformation ; kinetic ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    On the Influence of Piecewise Defined Contact Geometries on Friction Dampers (2023)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work considers dampers that do not solely focus on a single strategy but instead combine them. The capabilities of conventional dry friction dampers are expanded by taking into account piecewise defined contact geometries. This leads to friction dampers that change their behavior depending on the amplitude of the oscillations. The vibration damping device in this work, introduces damping at high oscillation amplitudes and takes advantage of absorption at low oscillation amplitudes.
    Keywords: semi-active systems ; averaging methods ; friction dampers ; semi-aktive Systeme ; Mittelwertbildung ; Reibungsdämpfer ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Kleinskalige Charakterisierung der Fest-Flüssig-Trennung und Betrachtung des Scherbruchs von Proteinkristallen (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Proteins are macromolecules composed of amino acids that are essential for a large number of biological metabolic processes. Proteins are also used in technical applications, for example to catalyze reactions. The objective of this work is to provide an indication of filterability early in the process development. A filtration cell for a centrifuge developed in this work makes it possible to characterize filtration on a small scale.
    Keywords: Proteinkristall; Fest-Flüssig-Trennung; Kleinstmaßstab; Bruch; Protein Crystal; Solid-Liquid Separation; Small Scale; Fracture ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Proceedings - 30. Workshop Computational Intelligence : Berlin, 26. - 27. November 2020 (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The proceedings of the 30th workshop on computational intelligence focus on methods, applications, and tools for fuzzy systems, artificial neural networks, deep learning, system identification, and data mining techniques.
    Keywords: Computational Intelligence ; Data Mining ; Deep Learning ; Machinelles Lernen ; Evolutionäre Algorithmen ; Machine Learning ; Evolutionary Algorithms ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Werkzeuge und Konzepte für die Untersuchung und Entwicklung zukünftiger Kfz-Bremssysteme (2022)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The electrification of the power train as well as the automatisation of driving have a strong influence on chassis for future vehicles. Due to the possibility for recuperation using the electric motor a strong shift in the so far used load spectrum can be seen. Furthermore, this increases the high amount of requirements for brake systems. For understanding the interactions and for developing corresponding optimal systems for future vehicles, proper tools and concepts are necessary.
    Keywords: Bremssysteme; hydraulisch; by-Wire; Werkzeuge; Elektromobilität; brake systems; hydraulic; by-wire; tools; electrification ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Modeling of Dislocation (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: A physically-based dislocation theory of plasticity is derived within an extended continuum mechanical context. Thermodynamically consistent flow rules at the grain boundaries are derived. With an analytical solution of a three-phase periodic laminate, dislocation pile-up at grain boundaries and dislocation transmission through the grain boundaries are investigated. For the finite element implementations, numerically efficient approaches are introduced based on accumulated field variables.
    Keywords: Gradienten-Kristallplastizität ; Erweiterte Kontinuumstheorie ; Kontinuumsversetzungstheorie ; Korngrenzmodellierung ; Finite Elemente Methode ; Gradient Crystal Plasticity ; Extended Continuum Theory ; Continuum Dislocation Theory ; Grain Boundary Modeling ; Finite Element Method ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Phasenfeldmodellierung von Bruchbildungs-, Kristallisations- und Auflösungsvorgängen in hydrothermalen Umgebungen (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work focuses on the numerical investigation of fracture formation, crystallization, and crystal dissolution processes in subsurface hydrothermal environments on microscale. Phase-field models are presented and applied to these processes. The formation of mineral veins in limestones and in quartz-rich microstructures are modeled to investigate different factors which influence the evolving crystal structure. Moreover, crystal dissolution processes of different minerals are modeled.
    Keywords: Phasenfeldsimulation; Rissausbreitung; Kristallisation; Kristallauflösung; Mikrostrukturanalyse; phase-field simulation; fracture formation; crystallization; crystal dissolution; microstructure analysis ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Chemomechanische Modellierung der Wärmebehandlung von Stählen mit der Phasenfeldmethode (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The development of high-strength steels can be accelerated using numerical methods. In particular, the phase-field method has emerged as a powerful tool to describe the microstructure evolution on the mesoscopic length scale. In the present work, multiphase-field models are presented to numerically display the morphological evolution during the heat treatment of steel.
    Keywords: Phasenfeldmethode ; Dualphasenstahl ; Wärmebehandlung ; Modellierung ; phase field ; dual-phase steel ; modeling ; heat treatment ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Kooperative Planung und Steuerung in logistischen Netzwerken (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: This work examines the causes and consequences of volatility in the regular processes of a logistic network. On the basis of the findings, a concept for cooperative planning and control using software agents is proposed and evaluated in a simulation environment in comparison to a sequence control based on the FIFO principle. The focus is on examining the effectiveness of a dynamic urgency assessment for prioritizing orders.
    Keywords: Supply Chain Management ; Simulation ; Softwareagenten ; Transportlogistik ; Lean ; Software Agents ; Transport Logistics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Methode zur Ermittlung optimaler Rad- und Reifendimensionen in der frühen Entwicklungsphase von Personenkraftwagen (2024)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: In the context of the present work methods are developed, which allow the statistical estimation of feasible ranges of functional tyre characteristics for any combination of rim and tyre dimension under different operating conditions. Therefore, measurement data regarding energy efficiency, driving dynamics and comfort are statistically analyzed and interpreted with regard to their physical root causes.
    Keywords: Functional Tyre Characteristics (FTC); Rim dimension; Tyre dimension; Rim; Tyre; Funktionale Reifeneigenschaften (FTC); Raddimension; Reifendimension; Rad; Reifen ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Der Spröd-duktil-Übergang in ultrafeinkörnigem Wolfram (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: High brittle-ductile transition temperatures preclude the use of conventionally manufactured tungsten (W) as a structural material. Ultrafine grained (UFG) W materials, however, exhibit the brittle-ductile transition at very low temperatures and consequently exhibit room-temperature ductility. The correlative microstructure analysis revealed a strong correlation between the transition temperature and the mean grain boundary spacing along the crack front.
    Keywords: kink pair mechanism; Arrhenius activation energy; brittle-ductile transition; ultrafine grained; Kinkenpaarmechanismus; Arrhenius-Aktivierungsenergie; Spröd-duktil-Übergang; ultrafeinkörnig; tungsten; Wolfram ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    Innovative micro-NMR/MRI functionality utilizing flexible electronics and control systems (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The advantages offered by the flexible electronics and control systems technologies were utilized for tackling the challenges facing two crucial Magnetic Resonance (MR) applications. The first application is in the field of interventional Magnetic Resonance Imaging (MRI), and the other application is in the field of Nuclear Magnetic Resonance spectroscopy (NMR).
    Keywords: Interventional MRI; micro-NMR; Flexible electronics; Interventionelle MRT; Mikro-NMR; Mikrofabrikation; Flexible Elektronik; Microfabrication; Control systems ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Steuerung und Regelung des Lenkradmoments durch Nutzung radselektiver Frontantriebe (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The use of wheel-individual drives on the steered axle simultaneously enables propulsion and implementation of steering assistance. This work presents a closed-loop and open-loop method for controlling wheel-selective drives with the aim of reducing the steering wheel torque. The proposed optimal linear-quadratic-integral controller achieves a high control quality while ensuring driving safety and reducing energy consumption.
    Keywords: wheel individual ; steering assistance ; steering torque ; closed-loop control ; Open-loop control ; radselektiv ; Lenkkraftunterstützung ; Lenkradmoment ; Regelung ; Steuerung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    On direct and inverse problems related to longitudinal impact of non-uniform elastic rods (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: The impact of two non-uniform elastic rods is considered and a recursive method was developed that solves the inverse problem: Find the location-dependent impedance function of the impacting rod that generates a prescribed impact force. The developed method delivers exact solutions in closed-form. Moreover, a condition is derived which states if a physically meaningful solution exists. Finally, the underlying 1D model has been validated experimentally.
    Keywords: Stoßkraft ; Charakteristische Impedanz ; Wellenausbreitung in elastischen Stäben ; Inverser rekursiver Algorithmus ; Impact force ; Characteristic impedance ; Wave propagation in non-uniform elastic rods ; Inverse recursive algorithm ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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    Thermomechanischer Kontakt und stochastische Dynamik gleitender Körper mit rauen Oberflächen (2023)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Within this work, the friction coefficient is calculated for the dry contact of two sliding metallic bodies as a function of various physical parameters. For this purpose, a thermomechanical model is developed and evaluated for different contact configurations considering the surface roughness of both contact bodies. Subsequent investigations on the consequences of the calculated friction coefficient in the context of friction-induced vibrations are carried out.
    Keywords: Strukurdynamik; Thermoelastizität; Kontaktmechanik; Stochastik; Stabilitätstheorie; Trockene Reibung; Raue Oberflächen; structural dynamics; thermoelasticity; contact mechanics; stochastics; theory of stability; dry friction; rough surfaces ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: German
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    AI and IoT Meet Mobile Machines (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Infrastructure construction is society's cornerstone and economics' catalyst. Therefore, improving mobile machinery's efficiency and reducing their cost of use have enormous economic benefits in the vast and growing construction market. In this thesis, I envision a novel concept smart working site to increase productivity through fleet management from multiple aspects and with Artificial Intelligence (AI) and Internet of Things (IoT).
    Keywords: Smart Working Site; Multi Working Machine Pathfinding Algorithm; Multivariable Time Series Classification Algorithm; SLAM; 5G; IEEE 802.11p ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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