Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 70 for “"Thermal Models"”.
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THERMAL MODELS OF LITHIUM-ION CELLS AND BATTERIES
<p> In this research work, a variety of thermal models for lithium-ion cells and battery systems with different materials and configurations were developed by incorporating the cell energy balance equations and the temperature-dependency of cell parameters into the different electrochemical …
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Coupling of Fluid & Solid Thermal Models to Correct Heat Flux Measurements Taken on Launch Vehicles
<p>Knowledge of aerothermally induced convective heat transfer and plume induced radiative heat transfer loads is essential to the design of thermal protection systems (TPS) for launch vehicles. These loads are measured via the cylindrical heat flux gauges that are flush mounted with the outer …
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Quantum-mechanics simulations of bi and tridimensional periodic systems. Thermal models, friction and self-assembly
Esta tesis, titulada "Simulaciones Mecánico-Cuánticas de Sistemas Periódicos Bi y Tridimensionales. Modelos térmicos, fricción y auto ensamblado", aborda desde la perspectiva de la química teórica y computacional la explicación detallada y el entendimiento de diferentes fenómenos de alto interés …
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Thermal models of buildings : determination of temperatures, heating and cooling loads : theories, models and computer programs
… the authors work with problems related to thermal models and calculation methods for determination of temperatures and heating or cooling loads in buildings. Thus the major part of the report deals with treatment of solar radiation in glazing systems, shading of solar and sky radiation and …
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Optimisation of electrical machines using data-driven dynamic thermal models and surrogate-based multi-objective evolutionary algorithms.
… low-complexity, data-driven Linear Regression models for estimating motor component temperatures as an alternative to traditional thermal models that depend on the physical aspects of the motor and extensive domain knowledge. A multi-objective thermal modelling framework is proposed to find the …
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Handheld infrared camera use for suicide bomb detection: feasibility of use for thermal model comparison
… are passive sensors that create infrared, or thermal, images without having to expose the subject to any radiation. These images show the heat signature that is given off by objects of interest. Previous studies using infrared detectors for concealed weapon detection have tried to observe the …
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Model order reduction of electro-thermal MEMS
The modeling of electro-thermal processes, for example Joule heating, is becoming increasingly important in microsystems (in the following MEMS) development. In microelectronic systems, for example, high temperatures may cause the malfunction or even destruction of the device. Other devices, such …
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Earthquake behavior and structure of oceanic transform faults
… mechanics. Here, I use seismic observations and models to explore how fault structure affects mechanisms of slip at oceanic transforms. Using teleseismic data, I find that seismic swarms on East Pacific Rise (EPR) transforms exhibit characteristics consistent with the rupture propagation velocity …
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Earthquake behavior and structure of oceanic transform faults
… mechanics. Here, I use seismic observations and models to explore how fault structure affects mechanisms of slip at oceanic transforms. Using teleseismic data, I find that seismic swarms on East Pacific Rise (EPR) transforms exhibit characteristics consistent with the rupture propagation velocity …
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Double-Sided Liquid Cooling for Power Semiconductor Devices Using Embedded Power Technology
… with non-wire bond packaging to improve thermal management while maintaining proper electrical performance. Embedded power is one such packaging technology, which provides a compact structure for interface of power semiconductor to fluid flow. The objective of this work was to identify …
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Modeling, Simulation and Design of EOS/ESD Protection Devices and Circuits in Silicon-on-Insulator Technology
… The simulator, SOI-iETSIM, has built-in device models for completely coupled electrothermal simulation of SOI protection devices operating in the high current regime. The implementation of thermal models in a circuit level simulator for SOI circuits is discussed. Modeling the floating body …
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3 dimensional flow and thermal modelling of the friction stir welding process
… authors have used analytical and numerical thermal models to predict the weld microstructure and residual stress and distortion. However these models have not yet been able to predict the conditions whereby a successful weld can be achieved. To fully understand the complete welding process …
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Inverter Dynamic Electro-Thermal Simulation with Experimental Verification
A full electro-thermal simulation of a three-phase space-vector-modulated (SVM) inverter is performed and validated with measurements. Electrical parameters are extracted over temperature for the insulated gate bipolar transistor (IGBT) and diode electro-thermal models. A thermal network …
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Modeling of Thermal Storage Silos and Heat Exchanger for Particle-Based Concentrated Solar Power
… previous work on the development of subcomponent models, but these existing models are complex and computationally expensive. The goal of this work is the development of simpler thermal models of a particle storage silo and a particle-to-super critical carbon dioxide heat exchanger. These models …
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Thermal-based probe for testing endothelial dysfunction and possible implications for diagnosing atherosclerosis
… can be readily and unambiguously quantified. A thermal-based approach using temperature and blood perfusion measurements in conjunction with an arterial challenge has the potential to quantitatively assess endothelial dysfunction. This report includes a detailed review of previous attempts to …
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Different styles of deformation of the fore-arc wedge along the Chilean convergent margin : insights from 3D numerical experiments
… magnitude of MW=9.5. I have constructed 2D thermal models and 3D mechanical models for both Chilean study areas to study processes related to active subduction. The applied numerical method is the finite element technique by means of the commercial software package ABAQUS. The thermal models …
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Integrated EMI/Thermal Design for Switching Power Supplies
… presents the modeling and analysis of EMI and thermal performance for switch power supply by using the CAD tools. The methodology and design guidelines are developed. By using a boost PFC circuit as an example, an equivalent circuit model is built for EMI noise prediction and analysis. The …
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Dynamic Electrothermal Model of a Sputtered Thermopile Thermal Radiation Detector for Earth Radiation Budget Applications
… the Earth through a Cassegrain telescope. The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently studying a new sensor concept to replace the current bolometer: a thermopile thermal radiation …
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Photonic crystal enhanced LED for electroluminescence cooling
… LED is designed to have smaller surface area and thermal mass compared to an encapsulated one to eliminate overwhelming convection heat flux. According to our thermal models, such an LED should exhibit temperature by 0.1 K and 0.5 K in air and vacuum, respectively. We also present preliminary …
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Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs
… the experimental and numerical study of the thermal management of Li-ion battery packs under the context of electric vehicle (EV) or hybrid EV (HEV) applications. Li-ion batteries have been extensively demonstrated as an important power source for EVs or HEVs. However, thermal management is a …
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