中文摘要：

结合有限元分析法和电子电路分析法建立了多模态下压电振动能量收集器与交流-直流（AC-DC）菲线性负载电路相连接的等效电路仿真模型.利用有限元分析软件ANSYS确定了压电能量收集器的等效电路参数,根据这些等效电路参数,在PSPICE软件中建立了非线性负载电路条件下压电振动能量收集器的等效电路仿真模型,并实现了其输出电压和功率的快速仿真.仿真结果表明,等效电路仿真模型可得非线性负载电路条件下压电振动能量收集器的输出电压和功率,而这是单独使用ANSYS软件完全不能解决的.这为多模态下压电振动能量收集器的电能预测提供了一种简便而有效的分析方法,更为解决任意复杂非线性负载电路条件下压电振动能量收集器的输出电能预测打下了基础.

英文摘要：

The equivalent simulation circuit model of multi-mode piezoelectric vibration energy harvester connected with an AC-DC nonlinear load circuit is established by combining the methods of finite element analysis and electronic circuit analysis.The equivalent circuit parameters of the piezoelectric energy harvester are determined by using finite element analysis software ANSYS.Based on these parameters,the equivalent simulation circuit model of piezoelectric vibration energy harvester under a nonlinear load circuit is established and the fast simulation of the output voltage and power of piezoelectric energy harvester is realized using PSPICE software.The simulation results show that the output voltage and power of the piezoelectric vibration energy harvester connected with nonlinear load circuit can be easily obtained by this equivalent simulation circuit model,which can not be solved only by the finite element analysis software ANSYS own.This equivalent simulation circuit model not only provides a convenient and effective method for predicting the electric energy of vibration-based piezoelectric energy harvester with multiple modes,but also lays a foundation for solving the output power prediction of piezoelectric vibration energy harvester connected with any complicated nonlinear load circuit.