Abstract
This paper reports a new design with dual resonant structure which is more efficient than single resonant devices for random vibration energy harvesting. The dual resonant structure consists of two spring-mass subsystems, which exhibits strong coupling when the two masses collide with each other. Experiments with piezoelectric elements show that the energy harvesting device with dual resonant structure can generate higher power output than the sum of the two separate devices from random vibration sources at low frequency.
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