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| Modeling and parameter influence analysis of bistable piezoelectric energy harvester with an elastic magnifier |
| Received:January 21, 2019 Revised:June 10, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20190121001 |
| KeyWord:bistable energy harvester elastic magnifier distributed parameter model nonlinear characteristics harmonic balance method parameter analysis |
| Author | Institution |
| 张宇 |
合肥工业大学 土木与水利工程学院, 合肥 |
| 汪权 |
合肥工业大学 土木与水利工程学院, 合肥 |
| 王建国 |
合肥工业大学 土木与水利工程学院, 合肥 |
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| Abstract: |
| The dynamic equation of bistable piezoelectric energy harvesters with an elastic amplifier (BPH+EM) is established using the generalized Hamilton variational principle.Considering harmonic excitation,the analytical solutions of displacement,output voltage and power of the proposed model are obtained by harmonic balance method.Using the proposed analytical solution,this paper discusses how BPH+EM system enlarges the frequency range of the energy capture and improves the efficiency of energy capture,and studies the influence of the stiffness-mass ratio of the elastic amplifier on the dynamic performance of BPH+EM system.It has proved that BPH+EM degenerate into bistable piezoelectric energy harvesters (BPH) when the stiffness of the elastic amplifier tends to be infinite,and that the harvesting energy efficiency of BPH+EM is lower than that of BPH when the stiffness of the elastic amplifier approaches zero but is not equal to zero.The results show that the energy harvesting efficiency of BPH+EM is significantly higher than BPH in the case of the appropriate stiffness to mass ratio.The research results provide theoretical guidance for the optimal design of BPH+EM. |