Development of a broadband nonlinear two-degree-of-freedom piezoelectric energy harvester
Soh, Chee Kiong
Date of Issue2014
School of Civil and Environmental Engineering
Vibration energy harvesting using piezoelectric material has received great research interest in the recent years. One important concern for the development of piezoelectric energy harvesting is to broaden the operating bandwidth. Various techniques have been proposed for broadband energy harvesting, such as the resonance tuning approach, the frequency up-conversion technique, the multi-modal harvesting, and the nonlinear technique. A recently reported linear 2-degree-of-freedom harvester can achieve two close resonant frequencies both with significant power outputs, using its unique cantilever configuration. This article proposes to incorporate magnetic nonlinearity into the linear 2-degree-of-freedom system, aiming at further broadening its operating bandwidth. Experimental parametric study is carried out to investigate the behavior of such nonlinear 2-degree-of-freedom harvester. Among different configurations, an optimal configuration of the nonlinear 2-degree-of-freedom harvester is obtained to achieve significantly wider bandwidth. A lumped parameter model for such nonlinear 2-degree-of-freedom harvester is developed, and the results provide good validation for the experimental findings.
Journal of intelligent material systems and structures
© 2014 The Authors. This is the author created version of a work that has been peer reviewed and accepted for publication in Journal of Intelligent Material Systems and Structures, published by SAGE Publications on behalf of The Authors. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1177/1045389X14541494].