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 12 of 12 for “"Sinusoidal excitation"”.
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Improvements in Inductively Coupled Wireless Power Transfer Through Non-Sinusoidal Excitation and Closed-Loop Operation Using Optical Feedback
… power transfer (WPT) systems. The first is non sinusoidal excitation technique. By analysing the characteristics of rectifier diodes, LR time constant, and circuit impedance for nonlinear signals, a triangular pulse input is designed to operate the rectifier diode at its high-conductance region. …
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Influence of higher time harmonics on the electrical and mechanical performance of an inverter-fed squirrel cage induction motor
… and current waveforms are generally quite non-sinusoidal and polluted with higher time harmonic components. The higher time harmonics affect the electrical and mechanical performance significantly, and adverse effects are investigated. Literature on the effect of higher time harmonics is …
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The Uniformly Tapered Circular Beam as a Dynamic Vibration Absorber.
… frequencies are set equal to the frequency of sinusoidal excitation of the primary system which is to have its vibration reduced or eliminated.It appears that Vance and Woodward, and, were the first to utilize continuous systems in dynamic vibration absorption. Their work dealt with hanging and …
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A numerical simulation of multiple-shaker model testing
… modal testing by the method of steady-state sinusoidal excitation by discrete shakers. An analytical method commonly known as Asher's Method was employed to optimize the shaker forceamplitude distributions for the purpose of isolating individual modes of vibration. The method involves the use …
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NONLINEAR DYNAMICS OF CABLE GALLOPING VIA A TWO-DEGREE-OF-FREEDOM NONLINEAR OSCILLATOR
… are obtained by gradually decreasing the sinusoidal excitation amplitude. In addition, the numerical simulations of stable and unstable periodic motions are illustrated. The rich dynamical behavior in such a nonlinear cable structure are discovered, and this investigation may help one …
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Absorbed power as a measure of whole body vehicular vibration exposure
… and the total power absorption under different excitations ( e.g. sinusoidal excitation, random excitation, and transient excitation) are derived. On the basis of the model and of the guidance provided in ISO 2631-1 (1997) to relate vibration exposure with the risks of health effects, health …
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The theory and design of switched-mode power transformers for minimum conductor loss
… The first phase of the investigation is for sinusoidal excitation; solutions for the current density and magnetic field intensity are derived and studied in order to develop a fundamental understanding of the basic phenomena. Expressions for the power dissipation and energy storage in both …
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Characterizing and modeling methods for power converters
… which supports core loss measurement for non-sinusoidal excitation”--Abstract, page iv.</p>
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Position Estimation in Switched Reluctance Motor Drives Using the First Switching Harmonics of Phase Voltage and Current
… propose a measurement methodology based on 60 Hz sinusoidal excitation using a variable AC power supply, which provides an alternative to time domain integration approaches for self-inductance or flux-linkage measurement as well as eliminates error arising from thermal and eddy currents effects. …
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The response of box-type structures to vibration.
… up to the prediction of its response to random excitation. Theoretical and experimental results for the box are presented as one of the main aims of the work is to predict theoretically the response of the structure to random excitation and compare these results with experimentally obtained …
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Mechanism of nonlinear biodynamic response of the human body exposed to whole-body vibration
… decrease with increasing magnitude of excitation. For the past two decades, this biodynamic ‘nonlinearity’ has been reported with vertical and horizontal excitation of the body in a wide variety of static sitting and standing postures that require activity from muscles to maintain the …
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High Frequency Magnetic Core Loss Study
… be improved by several orders. The first is for sinusoidal waveforms, and the second is for non-sinusoidal wave. The new methods enable high frequency core loss characterization capability, which will help scientists and engineers on material research and inductor/transformer design. Measurement …