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 74 for “"transient performance"”.
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TRANSIENT PERFORMANCE EVALUATION OF AUTOMOTIVE SECONDARY LOOP SYSTEMS
… in energy consumption and environmental performance can make a significant difference in fuel efficiency and comfort. The mandatory phase out of R134a as refrigerant in the European Union has set the stage for new systems and alternative refrigerants. While some of these refrigerants, …
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Battery Pack Design and Transient Performance Modeling for High-Power Legged Robots
… limits and actuator capabilities. However, high-performance maneuvers also demand rigorous consideration of onboard battery constraints. This work presents an empirically derived lithium-ion battery model that captures transient voltage sag and time-dependent internal battery state, enabling more …
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A dual/high-voltage automotive electrical power system with superior transient performance
… need to rewind the machine. Inherent load-dump transient suppression and jump-start charging features are also achieved. The attributes of this novel system have been experimentally demonstrated. The main goal of this thesis is to investigate and develop analytical system and subsystem models …
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Computer simulation of steady state and transient performance for permanent magnet DC motors
Permanent magnet motors have outstanding performance for applications such as industrial robots, computer peripherals and automobiles. Since these motors are being used in a growing number of applications, the techniques used to model them are becoming more important in an attempt to obtain the …
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Transient analysis of six-phase synchronous machines
… a mathematical model for investigating the transient performance of a six-phase synchronous machine, and develops a model for the simulation of such machines with the EMTP. The effect of the mutual leakage coupling between the two sets of three-phase stator windings are included in the …
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Transients in Electricity Networks with Distributed Generation
… This thesis investigates the micro-grid dynamic performance caused by different kinds of common disturbances such as sudden switching of Photovoltaic (PV) source, loss of a large system load and three-phase fault. The simulations and experiments are conducted in different micro-grid …
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Modelling of induction motors for system faults and transient stability studies
… the effects of large induction motors and their transient performance in power systems. Computer packages using the three phase co-ordinate frame of reference were developed to simulate the induction motor transient performance. A technique using matrix algebra was developed to allow extension of …
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Dynamic modeling and simulation of a nuclear power plant
… develop models that will adequately predict the transient performance of the plant for large power excursions. Characteristics of each subsystem that are deemed important in determining the transient response of the overall plant are modeled. Simulations of the individual subsystems are …
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Trustable Adaptive Controllers for Multi-Agent Systems with Actuator Dynamics
… and material conditions, which yields degraded performance or even instability. Hence, this dissertation investigates the distributed adaptive control design process for uncertain multi-agent systems with scalar and high-order dynamics in the presence of unknown control effectiveness and …
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A Novel Inverse Charge Constant On-Time Control for High Performance Voltage Regulators
… light loads, while also supporting a very fast transient response. Thus, the variable-frequency constant on-time current-mode (COTCM) control scheme is widely used in the VRs, as it can automatically reduce its switching frequency during light-load conditions. But, from transient point of view, …
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Wavelet adaptive and predictive control with applications to chemical looping system
… and control has not resulted in satisfactory performance due to its highly uncertain (200% actuator uncertainty) nonlinear multiphase multiscale behavior, bringing in a need for developing novel model-based nonlinear multiscale control solutions – the subject of this thesis. An evolving …
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Low-power amplifier chopper stabilization for a digital-to-analog converter
… media devices demand low-power and low-noise performance from the internal digital-to-analog converter. CMOS design has allowed for oversampling sigma-delta modulation to achieve these goals. However, noise is typically limited by the kT/C noise in the switched capacitor filter following the …
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Coupled Fluid-Structure Interaction Modeling of a Parafoil
<p>In the summer of 2014, Performance Designs, Inc. contacted Embry-Riddle Aeronautical University’s Eagle Flight Research Center to lead an investigation on square parachute design and optimization using modern computational methods to reduce costs in experimental testing. This thesis investigates …
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Analysis of slow convergence regions in adaptive systems
… which have been demonstrated to exhibit improved transient performance, as well as those that include an integral control in the inner-loop. Simulation and numerical studies are included to illustrate the size of this sticking region and its dependence on various system parameters. With the …
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Single-inductor, multiple-output buck converter with parallel source transient recovery
… (SIMO) DC-DC buck converter with parallel source transient recovery. This converter would provide substantial cost and space savings over traditional options for producing multiple supply voltages. Operating in pseudo-continuous conduction mode (PCCM), it can supply heavy loads while not suffering …
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Radio frequency dc-dc converters : device characterization, topology evaluation, and design
… for the opportunities it affords for improved performance. Dc-dc converters operating at high frequencies use smaller-valued energy storage elements, which tend to be physically smaller and lower-cost, and this can result in improved transient performance while retaining high efficiency. One …
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Modeling, Control and Stability Analysis of a PEBB Based DC Distribution Power System
… are modeled and analyzed for stability and good transient performance. A comprehensive stability analysis of a PEBB based DC DPS is performed. The effect of impedance overlap on the system and individual sub-systems is examined. Ability of a PEBB based converter to stabilize the integrated system …
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An Enhanced Transient Solid Oxide Fuel Cell Performance Model
… development costs, there is a need for accurate performance models to aid scientists and engineers in component and process design. To this end, an enhanced transient performance model has been developed. The present thesis enhances transient modeling and simulation via characterization of two …
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