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 7 of 7 for “"synchronous frequency"”.
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Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range
High-frequency and large amplitude current is a driving requirement for applications such as induction heating, wireless power transfer, power amplifier for magnetic resonant imaging, electronic ballasts, and ozone generators. Voltage-fed resonant inverters are normally employed, however, …
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Existence and stability analysis of ferroresonance using the generalized state-space averaging technique
… study of the ferroresonance problem, i.e, low frequency models. The theory of the incremental-input describing function is revisited and a subtle flaw in the formulation of the theory is modified to address the stability of general systems, particularly at synchronous frequency. A generalized …
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Oil-whirl instability in an automotive turbocharger
… indicated that there was shift in the sub-synchronous frequency to synchronous frequency between about 80,000 rpm to 130,000 rpm. The literature suggests that this self-excited vibration can be suppressed using forced excitation. Moreover, it is well known that the existence of limit cycles …
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Fault Location in Series Compensated Transmission Lines
… including but not limited to the presence of sub-synchronous frequency components in the measured signals, interdependence of the fault current level and operation of series capacitor protection unit, presence of non-linear element, i.e., metal-oxide varistor as a part of series capacitor …
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A Versatile and Computationally Efficient Condition Indicator for AH-64 Rotorcraft Gearboxes
… is proposed. The proposed CI is defined as Asynchronous to Synchronous Energy ratio in Time domain (ASET). As the name suggests, the ASET for a component rotating at a particular speed is obtained by dividing the total energy in the raw time domain signal with the energy in the time …
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The Modeling and Control of a Wind Farm and Grid Interconnection in a multi-machine system
… Since the utility grid requires the stable frequency and magnitude voltages, there must be grid interconnection of the wind farm and the utility grid. The grid interconnection must support the concept of the variable speed wind turbines. Since each wind turbine locates in a different …
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Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing
… in a Reynolds-based TPJB code to predict the frequency-dependent bearing impedances and rotor-pad transfer functions. Direct measurements of pad motion during test excitation were recorded to produce measured transfer functions between rotor and pad motion, and a comparison between these …