Design and testing of piezoelectric energy harvesting devices for generation ofhigher electric power for wireless sensor networks

摘要

This paper reports our design and testing results on the electric outputperformance of a vibration-based piezoelectric energy harvesting device (PEHD).The PEHD is a cantilever with a sandwich structure and seismic mass attached tothe tip. The geometric parameters of the device are based on optimization designwith a volume of around 1cm3 and at a targeted resonant frequency of 80-100 Hz.A maximum output power of 370μW at 15.5 volts into a 325kΩ resistive load isgenerated at the resonant frequency of 87Hz and under an acceleration of 0.23g.Quite remarkably, this power is a very encouraging power figure that gives theprospect of being able to power a wider range of applications than is currentlypossible in wireless sensor networ