Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 06, 2023 - March 07, 2023
In the IoT society, the number of sensor nodes is exponentially increasing. Energy Harvesting (EH) is attracting attention as a method of supplying power to sensors. There has been much studies on vibration EH (VEH) that generates electricity from the movement of the human body. The large device size and complex mechanism of the most of the conventional VEHs for human motion cause discomfort. Regarding these demerits, we have proposed a small and simple cantilever-type piezoelectric VEH (PVEH). The purpose of this study is to establish a design method for the PVEH that can generate power from impulse excitation. The power generation characteristics of the PVEH under impulse excitation were evaluated with different weight of mass. Experimental results showed that the amount of power increased with weight of the mass under constant vibration acceleration. On the other hand, the damping of the generated current waveform was more slowly with increasing the weight. Therefore, the power generation performance of the PVEH is maximized by setting the damping factor to match the generating frequency of impulse excitation.
