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为解决微系统的自供能问题,利用压电材料的压电效应将系统工作环境中的振动能转换成电能是一条有效途径。其中,压电悬臂梁具有结构简单、弹性好、能量传递能力强、易于加工等优点,因而成为压电能量采集器的一种理想选择。但设计过程中,由于结构响应特性与输出电压的未知性,造成了设计周期延长。为解决该问题,建立了压电式振动能量采集器机电耦合模型,并通过数值计算以完成结构输出位移和输出电压的求解。利用有限元软件对结构进行仿真分析,并得到不同几何尺寸对结构响应特性和输出性能的影响。加工了结构尺寸相同的原理样机,通过实验进一步验证数值计算与仿真分析的合理性、正确性和可靠性。最终实现设计过程的快速化、高效化。
In order to solve the problem of self-powered micro-system, it is an effective way to use the piezoelectric effect of piezoelectric materials to convert the vibration energy in system working environment into electrical energy. Among them, the piezoelectric cantilever beam has the advantages of simple structure, good elasticity, strong energy transfer capability and easy processing, and thus becomes an ideal choice for piezoelectric energy harvester. However, during the design process, the design cycle is prolonged due to the structural response characteristics and the unknown output voltage. In order to solve this problem, the electromechanical coupling model of piezoelectric vibration energy harvester is established and numerical calculation is performed to solve the output displacement and output voltage. The finite element software was used to simulate the structure, and the influence of different geometrical dimensions on the structure response and output performance was obtained. The prototypes with the same size and structure are processed. The rationality, correctness and reliability of numerical calculation and simulation analysis are further verified through experiments. The ultimate realization of the design process of rapid and efficient.