Journal
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
Volume 28, Issue 3, Pages 357-366Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1045389X16642536
Keywords
Energy harvesting; nonlinear vibration; piezoelectric; amplification effect; flexural motion
Categories
Funding
- Natural Science and Engineering Research Council of Canada
- State Key Program of National Natural Science of China [11232009]
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Piezoelectric energy harvesters have great potential for achieving inexhaustible power supply for small-scale electronic devices. However, the insufficient power-generation capability and the narrow working bandwidth of traditional energy harvesters have significantly hindered their adoption. To address these issues, we propose a nonlinear compressive-mode piezoelectric energy harvester. We embedded a multi-stage force amplification mechanism into the energy harvester, which greatly improved its power-generation capability. In this article, we describe how we first established an analytical model to study the force amplification effect. A lumped-parameter model was then built to simulate the strong nonlinear responses of the proposed energy harvester. A prototype was fabricated which demonstrated a superior power output of 30 mW under an excitation of 0.3g (g = 9.8 m/s(2)). We discuss at the end the effect of geometric parameters that are influential to the performance. The proposed energy harvester is suitable to be used in low-frequency weak-excitation environments for powering wireless sensors.
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