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Applied Physics Letters / Volume 97 / Issue 8 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 97, 081904 (2010); http://dx.doi.org/10.1063/1.3481689 (3 pages)

Passive self-tuning energy harvester for extracting energy from rotational motion

Lei Gu and Carol Livermore

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

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(Received 25 June 2010; accepted 2 August 2010; published online 24 August 2010)

This paper presents experiments and models of a passive self-tuning energy harvester for rotational vibration applications. Tensile stress due to centrifugal force in a radially oriented piezoelectric cantilever beam passively tunes the resonant frequency so that the harvester remains at or near its resonant frequency. Because centrifugal force is proportional to the square of driving frequency, the resonant frequency of an optimized harvester can track and match the driving frequency over a wide frequency range. An analytical model is presented to explain the harvester’s operation, advantages, and design parameter selection. A prototype demonstrated significantly improved performance compared with an untuned harvester.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

beams (structures), cantilevers, centrifuges, energy harvesting, vibrations

PACS

  • 84.60.-h

    Direct energy conversion and storage

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3481689

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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$abstract.society.value is a Member of CrossRef American Institute of Physics

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