Energy Conversion according to Impact loading on Piezoelectric material
J. Lee, T. Kim, B. Choi
Sogang University, KR
Keywords: piezo, energy harvesting, wireless sensor
Abstract:Energy harvesting using piezoelectric material has been one of the hottest interests in powering wireless sensor nodes without maintenance and replacement of wired or battery power system in ubiquitous era. Unlike most of the previous research and applications which have focused on cantilever type of piezoelectric energy converting methods, this research tests ‘33 mode’ piezo material which converts relatively vibration of unfixed frequency from ambient vibration into electric energy. To transmit the impact loading to piezo material, we conducted the ‘ball drop’ experiment. Based on the theoretical model to predict the total stress and voltage influenced by such factors as size of piezo material and mass and velocity of impact material (ball), tests are conducted to earn the optimal estimates of size of PZT and mass and velocity of impact materials for desired energy harvestings concerning its various applications. By altering mass and velocity of impact materials, it is observed to vary voltage potentials at the different conditions. This paper demonstrates the possibility to convert mechanical impact to electrical energy with 33mode piezoelectric material.