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Proceedings Paper

Power-amplifying strategy in vibration-powered energy harvesters
Author(s): Pyung Sik Ma; Jae Eun Kim; Yoon Young Kim
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Paper Abstract

A new cantilevered piezoelectric energy harvester (PEH) of which the additional lumped mass is connected to a harmonically oscillating base through an elastic foundation is proposed for maximizing generated power and enlarging its frequency bandwidth. The base motion is assumed to provide a given acceleration level. Earlier, a similar energy harvester employing the concept of the dynamic vibration absorber was developed but the mechanism of the present energy harvester is new because it incorporates a mass-spring system in addition to a conventional cantilevered piezoelectric energy harvesting beam with or without a tip mass. Consequently, the proposed energy harvester actually forms a two-degree-of-freedom system. It will be theoretically shown that the output power can be indeed substantially improved if the fundamental resonant frequencies of each of the two systems in the proposed energy harvester are simultaneously tuned as closely as possible to the input excitation frequency and also if the mass ratio of a piezoelectric energy harvesting beam to the lumped mass is adjusted below a certain value. The performance of the proposed energy harvester is checked by numerical simulation.

Paper Details

Date Published: 9 April 2010
PDF: 8 pages
Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76430O (9 April 2010); doi: 10.1117/12.848903
Show Author Affiliations
Pyung Sik Ma, Seoul National Univ. (Korea, Republic of)
Jae Eun Kim, Seoul National Univ. (Korea, Republic of)
Yoon Young Kim, Seoul National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7643:
Active and Passive Smart Structures and Integrated Systems 2010
Mehrdad N. Ghasemi-Nejhad, Editor(s)

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