Abstract
In the previous authors' study, the vibration energy harvester of the piezoelectric bimorph cantilever type was proposed for vibration condition monitoring applications of rotating machinery. Authors assumed that the typical casing or pedestal vibration amplitude of the rotating machinery was 0.71 mm/sec rms and this low intensity excitation condition was the input for experimental evaluation of the voltage generation performance of the piezocomposite vibration energy harvester. Proposed energy harvester consists of the surface bonded two Macro-Fiber Composites (MFCs). In this study, energy transfer efficiency was derived from the system energy balance during the natural period of the proposed vibration energy harvester. Energy balance equations were successfully obtained from the governing equations of the piezoelectrically coupled electro-mechanical system. In this study, the two types of cantilever, milling plate and thin plate, were used for evaluating the effect of the mechanical damping property of the clamped end. The maximum AC power of milling plate through 51.0 Kilo-Ohm resistor which includes instrument internal resistances experimentally obtained 408.8 microwatt at the resonant frequency of the harvester (58.40 Hz). The impedance matching between MFCs and the electrical resistive load was effective for maximizing AC power transfer of the vibration energy harvester. Estimated energy transfer from mechanical system to electrical system shows the agreement with the experimentally evaluated generating power during the natural period of the vibration energy harvester with about 3 (%) difference. Estimated energy transfer efficiency was about 30 % for different excitation magnitudes: 0.71, 0.568, and 0.355 mm/sec rms.
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More From: The Proceedings of the Symposium on Evaluation and Diagnosis
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