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 13 of 13 for “"Loss Modeling"”.
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Device Selection Criteria--Based on Loss Modeling and Figure of Merit
… have the best performance and lead to the lowest loss for this device in the circuit. Qgd*Rdson is a widely accepted and widely used FOM for power devices. Due to the lack of accuracy of the power loss model, this FOM is no longer suitable for VRM applications. Furthermore, the question of how to …
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Topics on conceptual design of the D8 aircraft : fuel burn uncertainty estimate and BLI propulsor loss modeling
… The second topic addressed in this thesis is the modeling of Boundary Layer Ingesting (BLI) propulsor losses at a level of fidelity appropriate for turbomachinery conceptual design analysis, i.e. nonaxisymmetric throughflow analysis. Two contributions to such an analysis based on a body force …
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MOSFET Current Source Gate Drivers, Switching Loss Modeling and Frequency Dithering Control for MHz Switching Frequency DC-DC Converters
… transition times and therefore switching loss in power MOSFETs. In addition, it can recover a portion of the gate energy normally dissipated in a conventional driver. Demonstrated loss reduction of 24.8% at 10V/5A load are presented in comparison to a conventional voltage source driver for …
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Imbalanced learning using actuarial modified loss function in tree-based models
… mass at zero and the heavy tail of insurance loss distribution poses the challenge to apply traditional methods directly to claim loss modeling. Via an illustrative simple dataset, this thesis first pinpoints the pitfall in the traditional tree-based algorithm’s splitting function. This thesis …
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Alternative structures for integrated electromagnetic passives
… with distributed-parameter models. High order modeling of integrated passives has been developed to investigate the electromagnetic performance. The design algorithm combining electromagnetic design and loss models has been developed to optimize and evaluate the spiral winding structure. High …
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Design and implementation of a single phase modified Z-source inverter topology for photovoltaic/grid interconnected DC charging applications
… designed and simulated using PLECS. Detailed loss modeling was done using PLECS. The peak efficiency of 94% was observed under irradiation and temperature changes. A scaled-down version of the proposed topology has been implemented for proof of concept. In a single-phase 60 Hz inverter, the …
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A Grid based Indoor Radiolocation Technique Based on Spatially Coherent Path Loss Model
… technique based on a Spatially Coherent Path Loss Model (SCPL). SCPL is a path loss model which characterizes the radio wave propagation in an environment by solely using Received Signal Strength (RSS) fingerprints. The propagation of the radio waves is characterized by uniformly dividing the …
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Essays in Quantitative Risk Management for Financial Regulation of Operational Risk Models
… outline requirements to calculate and set aside loss-absorbing regulatory capital to ensure the solvency of a bank. Mathematical models are typically used by banks to quantify sufficient amounts of capital. In this thesis, we explore areas that advance our knowledge in regulatory risk management. …
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Risk-Based Wind Loss and Mitigation for Residential Wood Framed Construction
As a result of increasing windstorm losses in the United States over the past 50 years, a variety of residential wind hazard mitigation methods have been suggested. Mitigation undoubtedly reduces windstorm losses; however, the expected economic risk reduction of mitigation practices over the life …
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An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems
… Specifically, improvements in total pressure loss modeling were implemented to ensure accurate and reliable off-design performance prediction. The assessment was made relative to the modeling of key transonic flow field phenomena, and provided the basis for improvements, central to which was …
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Performance Characterization of USRPs
… were also used in some experiments like path loss modeling, position location estimation in order to determine their effectiveness and impact on such applications. Although, these factors obtained may not be directly applicable to all USRP devices, as in any analog circuitry, and also since …
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Unified zero-current-transition techniques for high-power three-phase PWM inverters
… (PFC) rectifiers. In order to minimize switching losses, this work first proposes a new control scheme for an existing three-phase ZCT inverter circuit that uses six auxiliary switches. The proposed scheme, called the six-switch ZV/ZCT, enables all main switches, diodes and auxiliary switches to …
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Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems
… building electrical and thermal energy systems modeling is addressed, including solar and HVAC systems as well as batteries and large-scale thermal storage. A lab-scale power system features various update rates of a variable frequency fan drive over stochastic solar data. A full-scale …