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Proceedings Paper

Subharmonic orbits and their stability robustness to greatly enhance the bandwidth of bistable vibration energy harvesters
Author(s): Thomas Huguet; Adrien Badel; Olivier Druet; Mickaël Lallart
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Paper Abstract

This research work focuses on vibration energy harvesting in order to design an alternative to batteries for standalone, left-behind wireless devices. This study brings a new vision on bistable generators featuring nonlinear stiffness, presenting a wide operating frequency bandwidth compared to linear generators for a better adaptation to complex excitations. In this study, original behaviors of bistable oscillators are considered and analyzed for vibration energy harvesting, consisting in subharmonic motions for which the mass oscillates at a frequency N times lower than the excitation. First, experimental analysis is conducted with a generator integrating buckled beams for the bistability feature. It is shown that, in addition to the well-known first harmonic behavior, the third subharmonic orbit widens the bistable microgenerator useful operating frequency band by 180% compared to the sole exploitation of the first harmonic motion. A second part of this study analytically investigates those subharmonic orbits for the optimized design of future generator. The different orbits are obtained with the harmonic balance method and their stability is calculated for small disturbances. Stable orbits being more or less easy to reach and maintain, a new criterion is introduced, namely the stability robustness, indicating the stable orbit sensitivity to disturbances of different levels. For low stability robustness, the orbit will be considered as non-suitable for energy harvesting leading to a new definition of bistable generators frequency bandwidth. Analytical results following this method show good agreement with previous experimental results validating the relevance of stability robustness criterion.

Paper Details

Date Published: 27 March 2018
PDF: 12 pages
Proc. SPIE 10601, Smart Materials and Nondestructive Evaluation for Energy Systems IV, 106010D (27 March 2018);
Show Author Affiliations
Thomas Huguet, Lab. LGEF, Institut National des Sciences Appliquées de Lyon, Univ. de Lyon (France)
Adrien Badel, Lab. SYMME, Univ. Savoie Mont Blanc (France)
Olivier Druet, Institut Camille Jordan, Univ. de Lyon (France)
Mickaël Lallart, Institut National des Sciences Appliquées de Lyon (France)

Published in SPIE Proceedings Vol. 10601:
Smart Materials and Nondestructive Evaluation for Energy Systems IV
Theodoros E. Matikas, Editor(s)

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