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A Nonlinear Suspended Energy Harvester for a Tire Pressure Monitoring System

Department of Mechanical and Electromechanical Engineering, National Sun Yat-sen University, No. 70 Lienhai Road, Kaohsiung 80424, Taiwan
Department of Aerospace and Systems Engineering, Feng Chia University, No. 100 Wenhwa Road, Seatwen, Taichung 40724, Taiwan
Department of Mechanical and Computer-Aided Engineering, National Formosa University, Yunlin 632, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Paul D. Ronney
Micromachines 2015, 6(3), 312-327;
Received: 31 December 2014 / Revised: 17 February 2015 / Accepted: 24 February 2015 / Published: 27 February 2015
(This article belongs to the Special Issue Power MEMS)
PDF [3442 KB, uploaded 27 February 2015]


The objective of this study is to develop and analyze a nonlinear suspended energy harvester (NSEH) that can be mounted on a rotating wheel. The device comprises a permanent magnet as a mass in the kinetic system, two springs, and two coil sets. The mass vibrates along the transverse direction because of the variations in gravitational force. This research establishes nonlinear vibration equations based on the resonance frequency variation of the energy harvester; these equations are used for analyzing the power generation and vibration of the harvester. The kinetic behaviors can be determined according to the stiffness in the two directions of the two suspended springs. Electromagnetic damping is examined to estimate the power output and effect of the kinematic behaviors on NSEH. The power output of the NSEH with a 52 Ω resistor connected in series ranged from approximately 30 to 4200 μW at wheel speeds that ranged from nearly 200 to 900 rpm. View Full-Text
Keywords: nonlinear suspended energy harvester; resonance frequency; nonlinear dynamics; spring nonlinear suspended energy harvester; resonance frequency; nonlinear dynamics; spring

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, Y.-J.; Chen, C.-D.; Lin, C.-C.; Yu, J.-H. A Nonlinear Suspended Energy Harvester for a Tire Pressure Monitoring System. Micromachines 2015, 6, 312-327.

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