Abstract
Conversion of mechanical vibration energy into electric energy could provide reliable and efficient energy utilization. Both harvested resonant power and energy efficiency have been studied based on a single degree of freedom piezoelectric vibration energy harvester of a weak electromechanical coupling and normalized in a dimensionless form where the effect of the external load resistance and mechanical damping on the natural frequency is very small. Performance optimizations have been conducted for the energy harvester connected with different interface circuits in terms of normalized dimensionless harvested resonant power and resonant energy harvesting efficiency to identify both qualitatively and quantitatively the best energy extraction and storage interface circuit. Both the harvested resonant power and resonant energy harvesting efficiency formulas have been normalized in the dimensionless forms which are the functions of only the two dimensionless variables of the resistance and force factor regardless of the size and excitation magnitude of energy harvesters.
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