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research-article

Beam-based vibration energy harvesters tunable through folding

[+] Author and Article Information
Anup Pydah

Postdoctoral Research Associate, Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University M/C 0219, Blacksburg, Virginia 24061, USA
anpydah@vt.edu

Dr. Romesh Batra

Clifton C. Garvin Professor, Honorary member, ASME, Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University M/C 0219, Blacksburg, Virginia 24061, USA
rbatra@vt.edu

1Corresponding author.

ASME doi:10.1115/1.4040576 History: Received February 23, 2018; Revised June 05, 2018

Abstract

We present a novel beam-based vibration energy harvester that uses a structural tailoring concept to tune its resonance frequencies. Using a solution of the beam theory equations, verified with finite element (FE) simulations using a shell theory, we show that introducing folds or creases along the span of a slender beam, varying the the fold angle at a crease, and changing the crease location helps tune the beam natural frequencies to match an external excitation frequency and maximize the energy harvested. For a beam clamped at both ends, the first frequency can be increased by 232% with a single fold, while selective frequencies can be tuned, leaving others unchanged, with two folds. The fold location, the number of folds and the fold angle act as tuning parameters which provide high sensitivity and controllability of the frequency response of the harvester. The analytical model can be used to quickly optimize designs with multiple folds for anticipated external frequencies.

Copyright (c) 2018 by ASME
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