Design of an impact-type piezoelectric energy harvesting system for increasing power and durability of piezoelectric ceramics

• Published in: Japanese Journal of Applied Physics Vol. 53; no. 8S3; pp. 8 - 1-08NB03-6
• Main Authors: Jung, Hyun Jun, Moon, Jae Won, Song, Yooseob, Song, Daniel, Hong, Seong Kwang, Sung, Tae Hyun
• Format: Journal Article
• Language: English
• Published: The Japan Society of Applied Physics 01.08.2014
• Subjects: Computer simulation; Damage; Design engineering; Durability; Harvesters; Mathematical models; Piezoelectricity; Stress concentration; Stress distribution
• ISSN: 0021-4922; 1347-4065
• DOI: 10.7567/JJAP.53.08NB03

The purpose of this study is to design a piezoelectric energy harvester (PEH) that not only resists damage but also generates a higher power when impact is applied. To increase the generated power and durability a PEH, in this study, we investigated a new model and carried out numerical simulations of and experiments on the PEH. The numerical simulation results show that the stress distribution of the proposed PEH is more uniform than that of a conventional impact-type PEH. Thus, the proposed PEH decreases its possibility of being damaged. Experimental results for power under a matched impedance condition show that the maximum RMS powers of the conventional impact-type and proposed PEHs were 0.69 mW at 16 kΩ and 3.97 mW at 7 kΩ, respectively. Furthermore, the peak power of the proposed PEH was 518 mW, which was 3,047% higher than that of the conventional impact-type PEH having a peak power of 17 mW.