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  • Books  (46)
  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials  (46)
  • KIT Scientific Publishing  (46)
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  • German  (61)
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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
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    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
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    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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    Fundamentals for the Dimensioning and Optimization of Prestressed Segmented Girders for Application in Bridge Crane Systems (2022)
    KIT Scientific Publishing
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    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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  • 5
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    Process simulation of wet compression moulding for continuous fibre-reinforced polymers (2022)
    KIT Scientific Publishing
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    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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  • 6
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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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  • 7
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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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  • 8
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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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  • 9
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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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  • 10
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    Manufacturing-constrained multi-objective optimization of local patch reinforcements for discontinuous fiber reinforced composite parts (2021)
    KIT Scientific Publishing
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    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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  • 11
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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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  • 12
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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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  • 13
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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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  • 14
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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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  • 15
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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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  • 16
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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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  • 17
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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
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    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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  • 18
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    Consequences of hydroxyl generation by the silica/water reaction (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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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  • 19
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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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  • 20
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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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  • 21
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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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  • 22
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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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  • 23
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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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  • 24
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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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  • 25
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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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  • 26
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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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  • 27
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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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  • 28
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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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  • 29
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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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  • 30
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    Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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
    Details
    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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  • 33
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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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  • 34
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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
    Details
    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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  • 35
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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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  • 36
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    Modeling martensitic phase transformation in dual phase steels based on a sharp interface theory (2021)
    KIT Scientific Publishing
    Details
    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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  • 37
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    On the Influence of Piecewise Defined Contact Geometries on Friction Dampers (2023)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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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  • 38
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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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  • 39
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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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  • 40
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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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  • 41
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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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  • 42
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    Phase-field Modeling of Phase Changes and Mechanical Stresses in Electrode Particles of Secondary Batteries (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Most storage materials exhibit phase changes, which cause stresses and, thus, lead to damage of the electrode particles. In this work, a phase-field model for the cathode material NaxFePO4 of Na-ion batteries is studied to understand phase changes and stress evolution. Furthermore, we study the particle size and SOC dependent miscibility gap of the nanoscale insertion materials. Finally, we introduce the nonlocal species concentration theory, and show how the nonlocality influences the results.
    Keywords: Phasenfeldansatz ; Phasentrennung ; Nichtlokalität ; Endliche Verformungselastizität ; Sekundärbatterien ; Phase-field approach ; Phase segregation ; Nonlocality ; Finite deformation elasticity ; Secondary batteries ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 43
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    Performance Analysis and Capacity Planning of Multi-stage Stochastic Order Fulfilment Systems with Levelled Order Release and Order Deadlines (2022)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Order fulfilment systems are forced to manage a volatile customer demand while meeting customer-required short order deadlines. To handle these challenges, we introduce the Strategy of Levelled Order Release (LOR) for workload balancing over time. The contributions of this work are (1) the workload balancing concept LOR, (2) a discrete-time Markov chain for performance analysis, and (3) an algorithm for capacity planning under performance constraints in order fulfilment systems with LOR.
    Keywords: Order fulfilment; Glättung; Kapazitätsplanung; Markov-Kette; ableitungsfreie Optimierung; order fulfilment; workload balancing; capacity planning; Markov chain; derivative-free optimisation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 44
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    Structure evolution in tribological interfaces studied by multilayer model alloys (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Recent studies of deformation mechanisms of metals and alloys pioneer the better investigation of the friction and wear behavior of materials with well-defined initial microstructures. Within this scope, in this work, the effect of sub-surface deformations on the resulting friction and wear behavior has been searched by means of a systematic experimental study on Au-Ni metallic multilayer model alloy system.
    Keywords: Reibung und Verschleiß ; Plastizität ; nanocrystalline ; plasticity ; grain boundary ; dislocation ; friction and wear ; Au-Ni multilayers ; Nanokristallin ; Korngrenze ; Versetzung ; Au-Ni Multilagen ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 45
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    Characterisation and Modelling of Continuous-Discontinuous Sheet Moulding Compound Composites for Structural Applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The main objective of this work is to significantly deepen the understanding of the material and the structural behaviour of continuous-discontinuous SMC composites, following a holistic approach to investigate microscopic aspects, macroscopic mechanical behaviour as well as failure evolution at the coupon, structure and component level. In addition, criteria to evaluate the effect of hybridisation are introduced and modelling approaches are presented and discussed.
    Keywords: Hybride Materialien ; Faserverbundwerkstoffe ; Modellierung ; Charakterisierung ; Mechanische Materialeigenschaften ; Mikrostruktur ; Hybrid materials ; fiber composite materials ; modelling ; characterisation ; mechanical material properties ; microstructure ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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  • 46
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    Power Generation by Resonant Self-Actuation (2024)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Description: Research into micro energy harvesting systems has been driven by the need for self-sustaining, stable power sources for interconnected wireless sensors. Waste heat, particularly at temperatures below 200 °C, presents a promising but challenging energy source to recover using current conversion technology.
    Keywords: miniature energy harvesting; resonant self-actuation; thermomagnetic; power generation; Energy; Miniatur-Energie; ernteresonante Selbstaktivierung; thermomagnetisch; Stromerzeugung; Energie ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials
    Language: English
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