We present a novel beam-based vibration energy harvester, and use a structural tailoring concept to tune its natural frequencies. Using a solution of the Euler–Bernoulli beam theory equations, verified with finite element (FE) solutions of shell theory equations, we show that introducing folds or creases along the span of a slender beam, varying 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 175% with a single fold. With two folds, selective frequencies can be tuned, leaving others unchanged. The number of folds, their locations, and the fold angles act as tuning parameters that 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.
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February 2019
Research-Article
Beam-Based Vibration Energy Harvesters Tunable Through Folding
Anup Pydah,
Anup Pydah
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: anpydah@vt.edu
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: anpydah@vt.edu
Search for other works by this author on:
R. C. Batra
R. C. Batra
Clifton C. Garvin Professor
Honorary Mem. ASME
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: rbatra@vt.edu
Honorary Mem. ASME
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: rbatra@vt.edu
Search for other works by this author on:
Anup Pydah
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: anpydah@vt.edu
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: anpydah@vt.edu
R. C. Batra
Clifton C. Garvin Professor
Honorary Mem. ASME
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: rbatra@vt.edu
Honorary Mem. ASME
Department of Biomedical Engineering and
Mechanics (M/C 0219),
Virginia Polytechnic Institute and
State University,
Blacksburg, VA 24061
e-mail: rbatra@vt.edu
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 23, 2018; final manuscript received June 5, 2018; published online July 24, 2018. Assoc. Editor: Izhak Bucher.
J. Vib. Acoust. Feb 2019, 141(1): 011003 (6 pages)
Published Online: July 24, 2018
Article history
Received:
February 23, 2018
Revised:
June 5, 2018
Citation
Pydah, A., and Batra, R. C. (July 24, 2018). "Beam-Based Vibration Energy Harvesters Tunable Through Folding." ASME. J. Vib. Acoust. February 2019; 141(1): 011003. https://doi.org/10.1115/1.4040576
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