A three-degree-of-freedom bistable piezoelectric energy trapping method

Abstract

The use of piezoelectric energy harvester to convert environmental low-frequency vibration energy into electrical energy has become a research hotspot in the field of new energy. However, the piezoelectric energy harvester developed at present has high natural frequency and narrow energy trapping band, which has become one of the main reasons restricting the application of this technology. To solve this problem, based on the principle of nonlinear three degrees of freedom, this paper proposes a three-degree-of-freedom bistable piezoelectric energy trapping method. Firstly, the three-degree-of-freedom bistable energy capture method is modeled, and the energy capture frequency and nonlinear force of the model are derived; then use COMSOL software to simulate the model. The simulation results prove that this model not only reduces the natural frequency of the piezoelectric energy harvester, but also the introduced nonlinear magnetic force significantly broadens the energy trapping band. Finally, the actual measurement and comparative analysis of the proposed method prove the effectiveness of the proposed method.