压电振动能量收集器的建模与响应分析

以多方向压电振动能量收集器为对象，建立系统的简化机电耦合动力学模型。利用COMSOL软件构建能量收集装置的有限元模型，分析了系统的振动模态，讨论了系统不同结构参数对其电压频域响应及负载功率阻抗匹配的影响。引入非线性磁力，探究了不同磁间距对电学响应的作用。结果表明，能量收集器在y方向1g(g=9.8 m/s²)加速度载荷激励下，负载电压和负载功率峰值分别达到37 V、6.9 mW,减少压电陶瓷、弹簧基底厚度及增加附加质量块的质量有利于能量收集，并且能量收集装置在磁力作用下具有自主调谐功能，增强了环境适应性。

Modeling and Response Analysis of Piezoelectric VibrationEnergy Harvester

Taking the multi-directional piezoelectric vibration energy harvester as the object, a simplified electromechanical coupling dynamic model of the system is established, and the finite element model of the energy harvesting device is constructed by COMSOL software. The vibration modes of the system are analyzed, and the effects of different structural parameters of the system on its voltage frequency domain response and load power impedance matching are discussed. The effects of different magnetic spacing on the electrical response are investigated by introducing nonlinear magnetic force. The results show that the peak values of load voltage and load power of the energy harvester can reach 37 V and 6.9 mW respectively under the acceleration load of 1g(g=9.8 m/s2) in y direction. Reducing the thickness of piezoelectric ceramics, spring substrate and increasing the weight of additional mass block is more advantageous for energy harvesting, and the energy harvester has an autonomous tuning function under the action of magnetic force, which enhances the environmental adaptability.