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  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues  (128)
  • thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials  (46)
  • M14
  • ddc:300
  • KIT Scientific Publishing  (174)
  • English  (174)
  • Korean
  • Portuguese
  • Spanish
Collection
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  • English  (174)
  • Korean
  • Portuguese
  • Spanish
  • German  (321)
Years
  • 1
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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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  • 2
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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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  • 3
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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
    Details
    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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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 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
    Details
    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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    Deep material networks for efficient scale-bridging in thermomechanical simulations of solids (2023)
    KIT Scientific Publishing
    Details
    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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  • 11
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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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  • 12
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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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  • 13
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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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  • 14
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    Measurable Safety of Automated Driving Functions in Commercial Motor Vehicles (2023)
    KIT Scientific Publishing
    Details
    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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  • 15
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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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  • 16
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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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  • 17
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    Advanced Elastocaloric Cooling Devices Based on Shape Memory Alloy Films (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
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    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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  • 18
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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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  • 19
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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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  • 20
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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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  • 21
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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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  • 22
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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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  • 23
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    Stochastic Range Estimation Algorithms for Electric Vehicles using Data-Driven Learning Models (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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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  • 24
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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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  • 25
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    Microstructure generation and micromechanical modeling of sheet molding compound composites (2022)
    KIT Scientific Publishing
    Details
    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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  • 26
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    Efficient fast Fourier transform-based solvers for computing the thermomechanical behavior of applied materials (2022)
    KIT Scientific Publishing
    Details
    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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  • 27
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    NMR micro-detectors tailored for multinuclear and electrochemistry lab-on-a-chip applications (2022)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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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  • 28
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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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  • 29
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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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  • 30
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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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    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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    AI and IoT Meet Mobile Machines (2022)
    KIT Scientific Publishing
    Details
    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
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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
    Details
    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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    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
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    Millimeter-Wave Radio-over-Fiber Links based on Mode-Locked Laser Diodes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Radio communications in the range of 60 GHz enable multi-Gigabit/s network access in indoor environments. Due to the propagation characteristics of such signals only very short range radio transmission is feasible. In order to distribute these signals across large distances, analog transmission over optical fiber is considered. In this work, mode-locked laser diodes serve as optoelectronic oscillators for the generation of such signals. Their system-relevant properties are studied in detail.
    Keywords: T1-995 ; millimeter wave communications ; mode-locked lasers ; wireless personal area networks ; radio-over-fiber ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Magnetic Resonance Imaging on Patients with Implanted Cardiac Pacemakers (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The aim of this work was to identify the patterns that can induce heating around implanted cardiac pacemakers during MRI and to develop strategies to counteract them. Two approaches were taken: computer simulations of the occurring electromagnetic field distributions and in-vitro experiments using phantoms in real MRI devices, both for conventional bore-hole and new open MRI systems. Using the open MRI, the observed heating could be reduced significantly.
    Keywords: T1-995 ; pacemaker ; MRI ; numerical field calculation ; biomedical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Realization Limits of Impulse-Radio UWB Indoor Localization Systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work, the realization limits of an impulse-based Ultra-Wideband (UWB) localization system for indoor applications have been thoroughly investigated and verified by measurements. The analysis spans from the position calculation algorithms, through hardware realization and modeling, up to the localization experiments conducted in realistic scenarios. The main focus was put on identification and characterization of limiting factors as well as developing methods to overcome them.
    Keywords: T1-995 ; localization ; UWB ; transceiver ; positioning ; ultra-wideband ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    AlGaN/GaN-HEMT power amplifiers with optimized power-added efficiency for X-band applications (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: This work has arisen out of the strong demand for a superior power-added efficiency (PAE) of AlGaN/GaN high electron mobility transistor (HEMT) high-power amplifiers (HPAs) that are part of any advanced wireless multifunctional RF-system with limited prime energy. Different concepts and approaches on device and design level for PAE improvements are analyzed, e.g. structural and layout changes of the GaN transistor and advanced circuit design techniques for PAE improvements of GaN HEMT HPAs.
    Keywords: T1-995 ; MMIC design ; power amplifier ; AlGaN/GaN HEMT ; X-band ; power-added efficiency ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    The Effects of Internal Stress and Lithium Transport on Fracture in Storage Materials in Lithium-Ion Batteries (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Fracture of storage particles is considered to be one of the major reasons for capacity fade and increasing power loss in Li-ion batteries. In this work, we tackle the problem by merging a coupled model of mechanical stress and diffusion of Li-ions with a phase field description of an evolving crack. The novel approach allows us to study the evolution of the Li concentration together with the initiation and growth of a crack in an arbitrary geometry and without presuming a specific crack path.
    Keywords: T1-995 ; Lithium-Diffusion ; Lithium-Ionen-BatterienCrack Growth ; Storage Particles ; Risswachstum ; Phasefield ; Li-Diffusion ; Phasenfeld ; Li-Ion-Batteries ; Speicherpartikel ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Silicon-Organic Hybrid Platform for Photonic Integrated Circuits (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: We study the potential of the silicon-organic hybrid (SOH) platform for integrated optics. The unique properties of selected organic materials are added to silicon devices made with CMOS-based processes. We investigate the feasibility of this approach by making prototypes of key components in form of photonic integrated circuits: SOH lasers and SOH modulators are designed, fabricated, post-processed, and characterized. Application scenarios are identified.
    Keywords: T1-995 ; CMOS ; Modulator ; laser ; modulator ; Silizium-Photonik ; Laser ; Detektor ; CMOSsilicon photonics ; detector ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Numerical Modeling of Stagnation Flows over Porous Catalytic Surfaces (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: In this book, stagnation flows on a catalytic porous plate is modeled one-dimensionally coupled with multi-step surface reaction mechanisms and molecular transport (diffusion and conduction) in the flow field and in the porous catalyst. Internal and external mass transfer limitations as well as possible reaction routes in the catalyst are investigated for CO oxidation, WGS reaction, partial and steam reforming of methane over Rh/Al?O?.
    Keywords: T1-995 ; Heterogeneous catalysis ; Stofftransportlimitierungen ; Reaktion-DiffusionStagnation-flow reactor ; Staupunktreaktor ; Reaction-Diffusion ; Heterogenen Katalyse ; External and internal mass transfer limitation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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  • 42
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    High accuracy determination of skin friction differences in an air channel flow based on pressure drop measurements (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The present work delivers a versatile, accurate and reliable wind tunnel facility that is particularly developed to test different flow control techniques for drag reduction in precisely adjustable test conditions. Skin friction changes of 0.4% are resolved, which is comparable to the most accurate reported studies in liquids. this high accuracy is verified through a comprehensive uncertainty analysis. Subsequently, various passive and active flow control strategies are investigated.
    Keywords: T1-995 ; Riblets ; Kanalströmung ; pressure measurement ; riblets ; accuracy ; Messgenauigkeitchannel flow ; drag reduction ; Wandreibung ; Druckmessung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    ECG Based Analysis of the Ventricular Repolarisation in the Human Heart (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: ECG recordings provide diagnostic relevant information on the de- and repolarisation sequences of the heart. A modification of the repolarisation sequence is assumed to cause Torsades de Pointes. Especially drug induced effects on the repolarisation processes are in focus, since some non-cardiac drugs have been associated with sudden cardiac death in the 1990s. The analysis of the ventricular repolarisation using a set of parameters depicting the morphology of the T-wave is introduced in this work. Therefore, new methods of fully automatic patient-specific QRS detection, beat classification and precise T-wave delineation are presented. Using these methods, medical studies are investigated regarding the modification of the T-wave by different compounds. Also the impact of the heart rate on the morphology of the T-wave is part of this research.The reliable identification of ventricular ectopic beats allows an analysis of the influence of these beats on subsequent heart beats. It turned out that the morphology of subsequent heart beats can significantly be changed. This might give new information on the proarrythmical risk of ventricular ectopic beats.
    Keywords: T1-995 ; QT interval ; QT prolongation ; T wave ; Repolarisation ; HRT ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Development of an Electrochemical Biosensor Platform and a Suitable Low-Impedance Surface Modification Strategy (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: In this work, a flexible biosensor platform based on impedance spectroscopy and comprising of gold electrodes, polymeric flow cells and a suitable surface modification were developed. Initially, several surface modification techniques described in literature were implemented and optimized for impedimetric biosensors but their individual limitations rendered them unsuitable for this biosensor platform. A novel method based on photobleaching was developed and tested showing satisfactory results.
    Keywords: T1-995 ; Mikrofluidik ; electrochemical impedance spectroscopy ; Oberflächenmodifikation ; Biosensor ; surface modification ; photobleaching ; PhotobleichungBiosensor ; microfluidics ; Elektrochemische Impedanzspektroscopie ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Grain-size effects in nanoscaled electrolyte and cathode thin films for solid oxide fuel cells (SOFC) (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Due to their high energy conversion efficiencies and low emissions, Solid Oxide Fuel Cells (SOFCs) show promise as a replacement for combustion-based electrical generators at all sizes. Further increase of SOFC efficiency can be achieved by microstructural optimization of the oxygen-ion conducting electrolyte and the mixed ionic-electronic conducting cathode. By application of nanoscaled thin films, the exceptionally high efficiency allows the realization of mobile SOFCs.
    Keywords: T1-995 ; grain-size effect ; nanoscaled thin film ; solid oxide fuel cell (SOFC) ; cathode ; electrolyte ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Superconducting Multilayer Technology for Josephson Devices : Technology, Engineering, Physics, Applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Within this book fabrication processes for high-quality Josephson junctions based on niobium and aluminum oxide as well as niobium nitride and aluminum nitride on various substrates are discussed. Techniques for achieving a planar chip topography and sub-µm lateral dimensions, aiding the realization of sophisticated Josephson devices such as SQUIDs, flux-flow oscillators and long Josephson junctions with artificial phase discontinuities, are presented in detail.
    Keywords: T1-995 ; Superconductor ; Quantum ; Multilayer ; Cryogenics ; Josephson ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Integrated Planning and Control for Collision Avoidance Systems (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Collision avoidance systems like emergency braking assist systems have demonstrated their effectiveness in increasing the safety of vehicle passengers in various studies. To further increase the effectiveness of collision avoidance systems, the exploitation of the lateral free space by evasive maneuvers is being investigated in this book. This work focuses on methods for integrated trajectory planning and vehicle dynamics control in collision avoidance scenarios by combined evasion and braking.
    Keywords: T1-995 ; Fahrdynamikregelung ; model predictive control ; Collision Avoidance System ; Modelprädiktive Regelung ; Kollisionsvermeidung ; Trajectory Planning ; Driver Assistance System ; Fahrassistenzsystem ; Trajektorienplanung ; Vehicle Dynamics Control ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Numerical prediction of curing and process-induced distortion of composite structures (2021)
    KIT Scientific Publishing | KIT Scientific Publishing
    Details
    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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    Electrochemical Performance and Stability of Ba?.?Sr?.?Co?.?Fe?.?O??? for Oxygen Transport Membranes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Mixed ionic-electronic conducting (MIEC) ceramics as oxygen transport membranes (OTMs) can provide high oxygen permeation rates at comparably low energy demands. For this purpose, Ba?.?Sr?.?Co?.?Fe?.?O??? (BSCF) shows the best performance under ideal operating conditions. Thermal and chemical stability investigations, electrical behavior ?(T,pO?,t), and oxygen exchange parameter extraction by means of electrical conductivity relaxation resulted in a far better understanding of the BSCF system.
    Keywords: T1-995 ; electrochemical characterization ; thermische und chemische Stabilitätmixed ionic-electronic conductors ; oxygen transport membranes ; elektronische/ionische Mischleiter ; thermal and chemical stability ; Sauerstofftransportmembranen ; BSCF ; elektrochemische Charakterisierung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Application of the cohesive zone model to the analysis of rotors with a transverse crack (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Ein Riss im Rotor ruft eine lokale Steifigkeitsänderung hervor. Die vorliegende Arbeit ermittelt die Steifigkeitsänderung einer angerissenen Welle. Dazu wird ein Kohäsivzonenmodell eingesetzt. Das Modell wurde für die erste Rissöffnungsmode bei ebenem Verzerrungszustand in Abhängigkeit der Mehrachsigkeit des Spannungszustandes (Triaxialität) entwickelt. Außerdemwird das Kohäsivzonenmodell bei einem eindimensionalen Kontinuumsrotor als FE Modell ausgeführt.
    Keywords: T1-995 ; Cohesive zone model ; cracked rotor ; stiffness variation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Simulations for the optimization of High Temperatur Superconductor current leads for nuclear fusion applications (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
    Keywords: T1-995 ; current lead ; Nuclear fusion ; High Temperature Superconductor ; Computational thermal Fluid Dynamics ; Numerical simulation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Reactive Control of Turbulent Wall-Bounded Flows for Skin Friction Drag Reduction (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The work presents an attempt to improve the understanding of reactive drag reducing control of near-wall turbulence with respect to limitations present in a realistic application scenario. The reference reactive control scheme of opposition control is studied using direct numerical simulation through the consideration of various application oriented restrictions, i.e. local control application, limited spatial and temporal resolution of the scheme, sensor noise and control elements arrangement.
    Keywords: T1-995 ; turbulence control ; direct numerical simulation ; turbulent boundary layers ; Direkte Numerische Simulation ; Reibungsminderung ; drag reduction ; Turbulente Grenzschichten ; Turbulenzkontrolle ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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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
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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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    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
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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
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    Personalized Multi-Scale Modeling of the Atria: Heterogeneities, Fiber Architecture, Hemodialysis and Ablation Therapy (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: This book targets three fields of computational multi-scale cardiac modeling. First, advanced models of the cellular atrial electrophysiology and fiber orientation are introduced. Second, novel methods to create patient-specific models of the atria are described. Third, applications of personalized models in basic research and clinical practice are presented. The results mark an important step towards the patient-specific model-based atrial fibrillation diagnosis, understanding and treatment.
    Keywords: T1-995 ; atrial fibrillation ; radio-frequency ablation ; hemodialysis therapy ; atrial anatomy ; cardiac modeling ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Near Infrared Laser Sensor System for In-Line Detection of Conversion in UV-Cured Polymer Coatings (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The work describes a method for the determination of the conversion by radical photopolymerization of acrylic coatings that is suitable for an in situ monitoring during the coating process.The applied method is based on the 1620 nm overtone absorption of the acrylate end group. The capability of the sensor to discriminate between polymerized and unpolymerized coatings on metal substrates down to a coating thickness of less than 16µm is demonstrated and and proved by reference measurements.
    Keywords: T1-995 ; acrylate ; photopolymerization ; in-line monioring ; UV-coatings ; 1620 nm overtone absorption ; conversion monitoring ; IR-spectroscopy ; coating thickness ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Omnidirectional Stereo Vision for Autonomous Vehicles (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Environment perception with cameras is an important requirement for many applications for autonomous vehicles and robots. This work presents a stereoscopic omnidirectional camera system for autonomous vehicles which resolves the problem of a limited field of view and provides a 360° panoramic view of the environment. We present a new projection model for these cameras and show that the camera setup overcomes major drawbacks of traditional perspective cameras in many applications.
    Keywords: T1-995 ; Bildverarbeitung ; Autonomous Vehicles ; Rundumsicht ; Kamera-Kalibrierung ; Computer Vision ; Autonomes Fahren ; Robotik ; Camera-Calibration ; Omni-Vision ; Robotics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Optimization of Hot-Electron Bolometers for THz Radiation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Hot-electron bolometers are fast and low noise radiation detectors which can be used for many different applications. The aim of this work was to optimize the fabrication process of hot-electron bolometers and gain a deeper understanding of the underlying processes. To achieve this, the fabrication of the superconducting thin films was optimized and the superconducting properties of the films were analyzed. Detectors fabricated using the results showed a record value for the noise temperature.
    Keywords: T1-995 ; noise temperature ; superconductivity ; THz detector ; optimization ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Reports on industrial information technology. Vol. 12 (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The 12th volume of Reports on Industrial Information Technology presents some selected results of research achieved at the Institute of Industrial Information Technology during the last two years.These results have contributed to many cooperative projects with partners from academia and industry and cover current research interests including signal and image processing, pattern recognition, distributed systems, powerline communications, automotive applications, and robotics.
    Keywords: T1-995 ; Powerline Communications ; Image Processing ; Robotics and autonomous systems ; Automotive ; Signal Processing ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Throughput Analysis of Manual Order Picking Systems with Congestion Consideration (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Throughput in manual order picking systems with narrow aisles suffers from congestion as pickers cannot pass each other. Only few models incorporate congestion but they have very strict assumptions. In this work, queueing theory is used to analyze systems with traversal routing as well as different storage policies. The models are able to estimate throughput for many alternative designs in a relatively short amount of time. New guidelines for narrow-­aisle order picking systems are introduced.
    Keywords: T1-995 ; Order Picking ; Blocking ; Queueing Theory ; Congestion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Physically based Impedance Modelling of Lithium-Ion Cells (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book, a new procedure to analyze lithium-ion cells is introduced. The cells are disassembled to analyze their components in experimental cell housings. Then, Electrochemical Impedance Spectroscopy, time domain measurements and the Distribution function of Relaxation Times are applied to obtain a deep understanding of the relevant loss processes. This procedure yields a notable surplus of information about the electrode contributions to the overall internal resistance of the cell.
    Keywords: T1-995 ; Lithium-Ionen Zelle ; lithium-ion cell ; impedance spectroscopy ; Modell ; distribution of relaxation times ; Verteilung der Relaxationszeiten ; loss processes ; Impedanzspektroskopie ; model ; Verlustprozesse ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Solving the inverse problem of electrocardiography in a realistic environment (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Heart disease is a leading cause of death worldwide. Straightforward information about the cardiac electrophysiology can help to improve the quality of diagnosis of heart diseases. The inverse problem of electrocardiography and the intracardiac catheter measurement are two ways to get access to the electrophysiology in the heart. In this thesis six research topics related to these two techniques are included.
    Keywords: T1-995 ; premature ventricular contraction ; inverse problem of electrocardiography ; myocardial infarction ; ECG measurement system ; intracardiac mapping ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Geometrically exact theory for contact interactions (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The intuitive understanding of contact bodies is based on the geometry and adjoining surfaces. A powerful approach to solve the contact problem is to take advantage of the geometry of an analyzed object and describe the problem in the best coordinate system. This book is a systematical analysis of geometrical situations leading to contact pairs: suface-to-surface, curve-to-surface, point-to-surface a.s.o. resultingin the corresponding computational algorithms to solve the contact problem.
    Keywords: T1-995 ; geometrical methods in mechanics ; computatiobal contact mechanics ; covariant contact description ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Phase-field modeling of microstructural pattern formation in alloys and geological veins (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: With the advent of high performance computing, the application areas of the phase-field method, traditionally used to numerically model the phase transformation in metals and alloys, have now spanned into geoscience. A systematic investigation of the two distinct scientific problems in consideration suggest a strong influence of interfacial energy on the natural and induced pattern formation in diffusion-controlled regime.
    Keywords: T1-995 ; Oberflächenenergie ; GesteinsadernMultiphase-field model ; Interfacial energy ; Veins ; Multiphasenfeldmodell ; Eutektoider Umwandlungen ; Eutectoid transformations ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Probabilistic Maneuver Recognition in Traffic Scenarios (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work an approach is presented to model and recognize traffic maneuvers in terms of interactions between different traffic participants on extra urban roads. Results of the recognition concept are presented and evaluated using different sensor setups and its benefit is outlined by an integration into a software framework in the field of Car-to-Car (C2C) communications. Furthermore, recognition results are used in this work to robustly predict vehicle’s trajectories while driving dynamic
    Keywords: T1-995 ; Nachrichtenverifizierung ; Trajectory Prediction ; Maneuver Recognition ; Probabilistic Models ; Message Verification ; Situationsanalyse ; Probabilistische Modellierung ; TrajektorienprädiktionSituation Assessment ; Fahrmanövererkennung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Wireless Data Transmission for the Battery Management System of Electric and Hybrid Vehicles (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This work introduces a novel wireless approach for the data transmission within automotive battery management systems. The main target is the reduction of the wiring harness deployed in a battery. The characteristics of the wireless in-battery channel are investigated by means of measurements and software-based electromagnetic simulations. Different types of antennas and frequency bands are analyzed. The performance of the proposed system is evaluated by means of simulations and prototypes.
    Keywords: T1-995 ; HF-Messung ; Battery Management System ; Drahtlose Kommunikation ; Electromagnetic Simulation ; Antenne ; Wireless Communications ; Batteriemanagementsystem ; Elektromagnetische Simulation ; RF Measurement ; Antenna ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Millimeter-Precision Laser Rangefinder Using a Low-Cost Photon Counter (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this book we successfully demonstrate a millimeter-precision laser rangefinder using a low-cost photon counter. An application-specific integrated circuit (ASIC) comprises timing circuitry and single-photon avalanche diodes (SPADs) as the photodetectors. For the timing circuitry, a novel binning architecture for sampling the received signal is proposed which mitigates non-idealities that are inherent to a system with SPADs and timing circuitry in one chip.
    Keywords: T1-995 ; Photonenzähler ; Laser-EntfernungsmessgerätDistance measurement ; SPAD ; laser rangefinder ; Entfernungsmessung ; LIDAR ; photon counter ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Automatic Reconstruction of Textured 3D Models (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Three dimensional modeling and visualization of environments is an increasingly important problem. This work addresses the problem of automatic 3D reconstruction and we present a system for unsupervised reconstruction of textured 3D models in the context of modeling indoor environments. We present solutions to all aspects of the modeling process and an integrated system for the automatic creation of large scale 3D models.
    Keywords: T1-995 ; Robotik Rekonstruktion Modellierung Registering SLAMRobotics Reconstruction Modeling Registration SLAM ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Microstructural stability of nanostructured fcc metals during cyclic deformation and fatigue (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Nanostructured metals with maximal grain or twin sizes of less than 100 nm have advanced properties like increased strength.As beneficial as these microstructures can be for the strength of materials, they are not infinitely stable. During mechanical loading these metals tend to coarsen and lose their beneficial structure. Besides electron microscopic analysis of fatigued samples, in situ cycling tests were conducted in order to observe structural degradation during mechanical loading.
    Keywords: T1-995 ; fatigue ; nanostructured metals ; electron microscopy ; in situ ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    An Optical Grooming Switch for High-Speed Traffic Aggregation in Time, Space and Wavelength (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: In this book a novel optical switch is designed, developed, and tested. The switch integrates optical switching, transparent traffic aggregation/grooming, and optical regener-ation. Innovative switch subsystems are developed that enable these functionalities, including all-optical OTDM-to-WDM converters. High capacity ring interconnection between metro-core rings, carrying 130 Gbit/s OTDM traffic, and metro-access rings carring 43 Gbit/s WDM traffic is experimentally demonstrated. The developed switch features flexibility in bandwidth provisioning, scalability to higher traffic volumes, and backward compatibility with existing network implementations in a future-proof way.
    Keywords: T1-995 ; All-Optical Regeneration ; Traffic Grooming and Aggregation ; Time Division Multiplexing ; Optical Communications ; Wavelength Division Multiplexing ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Linear and Nonlinear Semiconductor Optical Amplifiers for Next-Generation Optical Networks (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: In this book, semiconductor optical amplifiers (SOAs) are studied with a view to linear and nonlinear applications in next-generation optical networks. Quantum-dot SOAs can be optimized for linear amplification of signals with different modulation formats and multiplexing techniques. Conversely, bulk SOAs can be easily optimized for operation in the nonlinear regime. However, due to the fast carrier recovery times in QD SOAs we also look into nonlinear applications with these devices.
    Keywords: T1-995 ; wavelength conversion ; semiconductor optical amplifier (SOA) ; reach extender ; quantum-dot ; access network ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Micromechanical Modeling and Simulation of Forming Processes (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The deep drawing of an aluminum alloy used in the packaging industry for the beverage can manufacturing process is investigated. In this work, the effective constitutive behavior is based on a crystal plasticity model in combination with a non-linear Hashin-Shtrikman type homogenization scheme in which a reference stiffness controls the stress and strain fluctuations. The simulation results are compared to experiments in terms of deep drawing earing profiles, texture evolution, and localization.
    Keywords: T1-995 ; Mikromechanik ; homogenization ; Homogenisierung ; sheet metal forming ; Multiskalen ; Blechumformungmicromechanics ; multiscale ; Kristallplastizität ; crystal plasticity ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Modelling the human cardiac fluid mechanics (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: We present a virtual heart model simulating the flow in the left human ventricle and in the aorta. Because of the lack of in vivo structure data of the human ventricle, the active ventricle movement is given by a time-dependent ventricle model that is derived from in vivo image data of a nuclear spin MRT tomograph of a healthy human heart. The passive part of the virtual heart model consists of a model aorta and vena cava, and of heart valves. As the movement is due to the flow in the inactive region of the heart, a coupling of flow and structure is necessary in the model to take into account the deviation of the aorta and the closing and opening of the heart valves. The flow calculation is performed with a finite volume method, while the structure of the aorta is calculated using the finite element method. The flow resistance of the time simulation in the body is taken into account with a circulation model. In the outlook of the article, we show how the virtual heart model can be used to predict flow losses due to pathological ventricle contraction defects in an unhealthy human heart.
    Keywords: T1-995 ; pathological ventricle defects ; Computer Fluid Dynamics ; in vivo ; left human ventricle ; MRI tomography ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Road Condition Estimation with Data Mining Methods using Vehicle Based Sensors (2021)
    KIT Scientific Publishing
    Details
    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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    Novel Aggregated Solutions for Robust Visual Tracking in Traf?c Scenarios (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This work proposes novel approaches for object tracking in challenging scenarios like severe occlusion, deteriorated vision and long range multi-object reidenti?cation. All these solutions are only based on image sequence captured by a monocular camera and do not require additional sensors. Experiments on standard benchmarks demonstrate an improved state-of-the-art performance of these approaches. Since all the presented approaches are smartly designed, they can run at a real-time speed.
    Keywords: T1-995 ; Occlusion ; geringe Beleuchtung ; Tracking ; multiple objects ; monocular camera ; low illumination ; mehrere Objeke ; Verdeckung ; monokulare Kamera ; Verfolgung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Nonlinear resonators for all-optical signal processing (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: All-optical signal processing will be used in future communication networks. We discuss a new and generic scheme for such devices. The basic configuration comprises an asymmetric resonator within an active or passive nonlinear medium. This arrangement enables all-optical flip-flop operation and switching with a reduced threshold. In addition, a novel optical isolator concept based on resonator asymmetries is is introduced. The model is also applicable to photonic crystal based resonators.
    Keywords: T1-995 ; All-optical signal processing ; Optical flip-flop ; Nonlinear resonators and photonic crystals ; Nonreciprocity ; Switching ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Active and Passive Plasmonic Devices for Optical Communications (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: A short introduction to the theory of surface plasmon polaritons (SPPs) is given. The application of the SPPs in on-chip signal processing is discussed. In particular, two concepts of plasmonic modulators are reported, wherein the SPPs are modulated by 40 Gbit/s electrical signals. Phase and Mach-Zehnder modulators employing the Pockels effect in electro-optic organic materials are discussed. A few micro-meter long SPP absorption modulator based on a thin layer of indium-tin-oxide is reported.
    Keywords: T1-995 ; phase modulator ; indium tin oxide ; Plasmonik ; surface plasmon polariton ; Indium-Zinn-Oxid ; Oberfla?chen-Plasmon-Polaritonen ; Plasmonics ; Modulatoren ; modulators ; Absorptionsmodulator ; Phasenmodulator ; absorption modulator ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Determining Cycle Times for Packing in Distribution Centres (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Scope of this work is to determine cycle time formulas for packing in distribution centres. No such formulas exist today, even if it is the second most important process after picking. Based on examining packing, morphological boxes showing time influencing parameters are derived. The most significant parameters are identified using analysis of variance (ANOVA). Cycle times are determined and applied to cases. These prove that the formulas can be used to calculate the time required for packing.
    Keywords: T1-995 ; cycle time ; Lagerpacking ; packaging ; Verpacken ; Packen ; Distributionszentrum ; warehouse ; distribution centre ; Spielzeit ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Automatic ECG analysis using principal component analysis and wavelet transformation (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The main objective of this book is to analyse and detect small changes in ECG waves and complexes that indicate cardiac diseases and disorders. Detecting predisposition to Torsade de Points (TDP) by analysing the beat-to-beat variability in T wave morphology is the main core of this work. The second main topic is detecting small changes in QRS complex and predicting future QRS complexes of patients. Moreover, the last main topic is clustering similar ECG components in different groups.
    Keywords: T1-995 ; Wavelet ; TdP ; Baseline Wander ; ECG ; Torsade de Points ; Feature Extraction ; Biosignal Pr ; Multi-Channel ECG ; Principal Component Analysis ; PCA ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Hyperspectral Image Unmixing Incorporating Adjacency Information (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: While the spectral information contained in hyperspectral images is rich, the spatial resolution of such images is in many cases very low. Many pixel spectra are mixtures of pure materials’ spectra and therefore need to be decomposed into their constituents. This work investigates new decomposition methods taking into account spectral, spatial and global 3D adjacency information. This allows for faster and more accurate decomposition results.
    Keywords: T1-995 ; Spektrale Entmischung ; spectral unmixing ; Blinde Quellentrennung ; Hyperspectral image processing ; Nichtnegative Matrixzerlegung ; nonnegative matrix factorization ; blind source separation ; Hyperspektrale Bildverarbeitung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Strategies to reduce friction losses and their implications for the energy efficient design of internal flow domains (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: This work aims at developing a strategy how the energy which has to be applied to transport incompressible and Newtonian fluids through straight ducts can be reduced. Based on the physical properties of laminar and turbulent flow, models are derived which theoretically lead to the reduction of the dissipated energy. The possibility to implement the proposed state due to appropriate design aspects in the cross section shape of the duct is investigated based on numerical simulations of the flow
    Keywords: T1-995 ; Strömungskontrolle ; direkte numerische Simulation ; direct numerical simulation ; turbulente Strömungflow control ; turbulent flow ; drag reduction ; Reibungsreduktion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    InP DHBT-based clock and data recovery circuits for ultra-high-speed optical data links (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: In this work, up to 80 Gbit/s monolithically integrated clock and data recovery (CDR) circuits with 1:2 demultiplexer are developed. The integrated circuits are manufactured using an InP double heterojunction bipolar transistor (DHBT) technology, featuring cut-off frequency values of more than 250 GHz. The outstanding and (to some extent) record achievements throughout the work make an essential contribution to the development of future optical telecommunication networks operating at 80 Gbit/s.
    Keywords: T1-995 ; InP DHBT ; Phase detector ; Phase-locked loop ; Optical link ; Clock and data recovery ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Formation of Intracardiac Electrograms under Physiological and Pathological Conditions (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: This work presents methods to advance electrophysiological simulations of intracardiac electrograms (IEGM). An experimental setup is introduced, which combines electrical measurements of extracellular potentials with a method for optical acquisition of the transmembrane voltage in-vitro. Thereby, intracardiac electrograms can be recorded under defined conditions. Using experimental and clinical signals, detailed simulations of IEGMs are parametrized, which can support clinical diagnosis.
    Keywords: T1-995 ; catheter ; Simulation ; experiment ; signal processing ; Experiment ; simulation ; Herz ; Katheter ; Signalverarbeitungheart ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Polarimetric Radar for Automotive Applications (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Current automotive radar sensors prove to be a weather robust and low-cost solution, but are suffering from low resolution and are not capable of classifying detected targets. However, for future applications like autonomous driving, such features are becoming ever increasingly important. On the basis of successful state-of-the-art applications, this work presents the first in-depth analysis and ground-breaking, novel results of polarimetric millimeter wave radars for automotive applications.
    Keywords: T1-995 ; Machine-Learning ; Millimeter-Wave Radar ; Automotive Radar ; Polarimetric Radar ; Target Classification ; Polarimetrie ; Millimeterwellen-Radar ; Objekterkennung ; KI ; Automotive-Radar ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Surface wave driven molecular low pressure plasmas for general lighting (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: Nowadays, compact fluorescent lamps are widely-used in general lighting applications. However, they still struggle with acceptance problems due to the hazardous mercury, which serves as the radiant component inside the lamp. The presented work deals with the development of a mercury-free, electrodeless, low pressure plasma based on a molecular filling and driven by microwaves, which may represent a viable alternative to the conventional CFLs.
    Keywords: T1-995 ; Plasma ; Surface waves ; Oberflächenwellen ; General lighting ; QuecksilberfreiPlasma ; Mercury free ; Mikrowellen ; Allgemein Beleuchtung ; Microwaves ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    Finite Element Method (FEM) Model and Performance Analysis of Solid Oxide Fuel Cells (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: This work presents a numerical FEM framework, capable of predicting SOFC performance under technically relevant, planar stack contacting conditions. A high level of confidence in the model predictions is supplied by using exclusively experimentally determined material/kinetic parameters and by a comprehensive validation. The presented model aids SOFC stack development by pre-evaluating possible material choices and design combinations for cells/interconnectors without any experimental effort.
    Keywords: T1-995 ; Finite Element Method (FEM) simulation ; Solid Oxide Fuel Cell (SOFC) ; Hochtemperatur Festoxid-Brennstoffzelle (SOFC) ; anode supported cell (ASC) ; Finite Elemente Methode (FEM) Simulation ; mischleitende (MIEC) Kathode ; mixed-ionic-electronic conductive (MIEC) cathode ; anodengestützte Zelle (ASC) ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
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    X-ray optics made by X-ray lithography: Process optimization and quality control (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Grating based X-ray phase contrast imaging sets out to overcome the limits of conventional X-ray imaging in the detection of subtle density differences and opens a way to characterize a sample’s microstructure without the need for ultrahigh spatial resolution. The technique relies on grating structures with micrometric periods and extreme aspect ratio – their fabrication by X-ray lithography with optimal structure quality is the topic of this work.
    Keywords: T1-995 ; Talbot effect ; Röntgengitter ; LIGA ; X-ray optics ; Phasenkontrast ; Talbot-Effect ; phase contrast ; X-ray gratings ; Röntgenoptik ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Microstructure and Mechanical Behavior of Deep Drawing DC04 Steel at Different Length Scales (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The deformation behavior of steels is strongly influenced by their microstructure which is a result of the alloying elements and thermal treatments. In this work, the microstructure and the deformation behavior of a non-alloyed deep drawing DC04 steel was investigated. The microstructure was analyzed during heat treatment by EBSD, then microcompression experiments were performed on selected microstructural units and then bulk steel samples were mechanically tested by tensile experiments.
    Keywords: T1-995 ; in-situ heating ; Microcompression experiments ; Tensile Experiments ; non-alloyed steel ; EBSD ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    On the Use of Model Order Reduction Techniques for the Elastohydrodynamic Contact Problem (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The objective of this work is to develop a method which solves the nonlinear elastohydrodynamic contact problem in a fast and precise way using model order reduction techniques. The reduction procedure is based on a projection onto a low-dimensional subspace using different hyper-reduction procedures. The method provides fast and highly accurate reduced order models for stationary and transient, Newtonian and Non-Newtonian EHD line and point contact problems.
    Keywords: T1-995 ; EHD ; Modellordnungsreduktion ; Newton-Raphson method ; model order reduction ; Newton-VerfahrenEHD ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    MIMO OFDM Radar-Communication System with Mutual Interference Cancellation (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This work describes the OFDM-based MIMO Radar-Communication System, intended for operation in a multiple-user network, especially the automotive sector in the vehicle-to vehicle/infrastructure network. The OFDM signals however are weak towards frequency offsets causing subcarrier misalignment and corrupts the radar estimation and the demodulation of the communication signal. A simple yet effective interference cancellation algorithm is detailed here with real time measurement verification.
    Keywords: T1-995 ; Multi-user network ; OFDM ; Radar ; Interference ; Radar-Communication System ; Mehrbenutzer NetwerkRadar ; Interferenz ; Radar-Kommunikations System ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Optical antennas : linear and nonlinear excitation and emission (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-09
    Description: The linear and nonlinear resonance behaviour of optical antennas (metallic nanostructures showing resonance behaviour at optical frequencies) made of gold and aluminum using electron-beam lithography is investigated. Specifically, it is of interest how the emission behaviour is changed by the coupling of two antenna arms via a small gap. Experimental techniques applied include dark-field spectroscopy and two-photon luminescence.
    Keywords: T1-995 ; plasmonics ; two-photon luminescence ; nanostructure ; resonance ; optical antenna ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Technology Assessment in Japan and Europe (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: The goal of technology assessment (TA) is to lend support to society and policy making by promoting understanding of the problems related to the grand sociotechnical challenges of our time, as well as to assess the available options for managing them. Researchers from Japan and Europe reflected together in this book on country-specific developments to identify the conditions that must be present to anchor TA in science, politics, and society. This book helps us to learn about different cultures.
    Keywords: T1-995 ; GesellschaftTechnology Assessment ; Policy Advice ; Technikfolgenabschätzung ; Society ; Inter-disciplinary Research ; interdisziplinärer Forschung ; Politikberatung ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    A Wearable Platform for Patient Monitoring during Mass Casualty Incidents (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Based on physiological data, intelligent algorithms can assist with the classification and recognition of the most severely impaired victims. This book presents a new sensorbased triage platform with the main proposal to join different sensor and communications technologies into a portable device. This new device must be able to assist the rescue units along with the tactical planning of the operation. This work discusses the implementation and the evaluation of the platform.
    Keywords: T1-995 ; Biosignalverarbeitung ; Biosensoren ; wearable device ; ad-hoc networks ; emergency response ; Notfallmanagement ; biosignal ; biosensors ; Ad-hoc Netzwerk ; tragbares Gerät ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Design studies towards a 4 MW 170 GHz coaxial-cavity gyrotron (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: In this work the feasibility of a 4 MW 170 GHz coaxial-cavity gyrotron for continuous wave operation is demonstrated. For the first time complete physical designs of the major gyrotron components are elaborated. In a first step, one possible new operating mode is determined, followed by the development of detailed physical designs of the major gyrotron components: Diode and triode type electron gun, coaxial cavity, two-beam quasi-optical output coupler and depressed collector.
    Keywords: T1-995 ; coaxial ; gyrotron ; cavity ; two beam ; 4 MW ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    RF Probe-Induced On-Wafer Measurement Errors in the Millimeter-Wave Frequency Range (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: Measurement at millimeter-wave frequencies are prone to parasitic effects which distort the overall results. Especially the use of RF probes introduces unknown distortions, even after the measurement setup is calibrated. This works investigates these distortions based on electromagnetic field simulations of integrated circuits in conjunction with models of the used RF probes. This allows to comprehend the observed distortions and successfully resolve the root of the distortions.
    Keywords: T1-995 ; On-Wafer Measurements ; Monolithic Microwave Integrated Circuits ; Halbleiterschaltungen ; Messtechnik ; Hochfrequenztechnik ; Electromagnetic Field Simulation ; Elektromagnetische Feldsimulation ; Radio Frequency ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Modeling and simulation of porous journal bearings in multibody systems (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: A specific cost-efficient type of plain journal bearing is the porous journal bearing, which possesses a pervious bush that serves as a lubricant reservoir. The current work is concerned with modeling porous journal bearings in multibody systems, for which dynamical models are needed to investigate the bearing’s behavior. Such porous journal bearing models as well as models of elementary rotor-bearing systems including these, were developed and investigated during the course for this work.
    Keywords: T1-995 ; mixed lubrication ; multibody systems ; porous journal bearing ; nonlinear dynamics ; rotor dynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Social cost-benefit analysis of air pollution control measures - Advancing environmental-economic assessment methods to evaluate industrial point emission sources (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: This book enhances economic methods for social cost-benefit analysis of air pollution control measures at point emission sources. A new and highly resolved health damage cost assessment framework is developed and applied, notably in order to evaluate the influence of site-dependent and generic methodological choices. Several of these are shown to have a major impact on resulting health damage costs with important implications for decision-making.
    Keywords: T1-995 ; externalities ; Kosten-Nutzen-Analyse ; cost-benefit analysis ; Emissionsminderungsmaßnahmen ; Gesundheitsschadenskosten ; air pollution ; health damage costs ; Luftverschmutzung ; Externalitäten ; pollution control measures ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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    Pattern effect mitigation techniques for all-optical wavelength converters based on semiconductor optical amplifiers (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-09
    Description: All-optical wavelength converters (AOWC) are considered key to overcome wavelength blocking issues in next generation transparent networks. The focus of this book is on semiconductor optical amplifiers (SOA), a mature nonlinear element with very favorable nonlinear characteristics, and on a discussion of various filter configurations as well as on their adaptations for providing optimum performance matched to the nonlinear element working in high-speed all-optical wavelength converters.
    Keywords: T1-995 ; Semiconductor Optical Amplifier ; Time Division Multiplexing ; Optical Communication ; Wavelength Division Multiplexing ; All-Optical Wavelength Conversion ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues
    Language: English
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