Power-amplifying strategy in vibration-powered energy harvesters

Pyung Sik Ma; Jae Eun Kim; Yoon Young Kim

doi:10.1117/12.848903

9 April 2010 Power-amplifying strategy in vibration-powered energy harvesters

Pyung Sik Ma, Jae Eun Kim, Yoon Young Kim

Proceedings Volume 7643, Active and Passive Smart Structures and Integrated Systems 2010; 76430O (2010) https://doi.org/10.1117/12.848903
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

Pyung Sik Ma, Jae Eun Kim, and Yoon Young Kim "Power-amplifying strategy in vibration-powered energy harvesters", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76430O (9 April 2010); https://doi.org/10.1117/12.848903

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