| Mechanical and Civil Engineering |
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| A 2DOF hybrid energy harvester based on combined piezoelectric and electromagnetic conversion mechanisms |
| Hong-yan Wang, Li-hua Tang, Yuan Guo, Xiao-biao Shan, Tao Xie |
| College of Computer and Control Engineering, Qiqihar University, Qiqihar 161006, China; State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China; Department of Mechanical Engineering, University of Auckland, Auckland 1010, New Zealand |
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Abstract This paper presents a two-degree-of-freedom (2DOF) hybrid piezoelectric-electromagnetic energy harvester (P-EMEH). Such a 2DOF system is designed to achieve two close resonant frequencies. The combined piezoelectric-electromagnetic conversion mechanism is exploited to further improve the total power output of the system in comparison to a stand-alone piezoelectric or electromagnetic conversion mechanism. First, a mathematical model for the 2DOF hybrid P-EMEH is established. Subsequently, the maximal power output of the 2DOF hybrid P-EMEH is compared both experimentally and theoretically with those from the 1DOF piezoelectric energy harvester (PEH), 1DOF electromagnetic energy harvester (EMEH), 2DOF PEH, and 2DOF EMEH. Based on the validated mathematical model, the effect of the effective electromechanical coupling coefficients (EMCC) on the maximal power outputs from various harvester configurations is analyzed. The results indicate that for the 2DOF hybrid P-EMEH, although the increase of the power output from one electromechanical transducer will lead to the decrease of the power output from the other, the overall performance of the system is improved in weak and medium coupling regimes by increasing electromechanical coupling. In weak and medium coupling scenarios, the hybrid energy harvester configuration is advantageous over conventional 1DOF or 2DOF harvester configurations with a stand-alone conversion mechanism.
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Received: 04 May 2014
Published: 04 June 2014
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