基于风致振动机理的压电发电机实验及仿真研究

随着低功耗微机电系统的发展，越来越多的微型发电机涌现，其中压电发电机为典型的代表。针对一种基于风致振动机理的柔性压电发电机进行了实验及仿真研究：建立柔性悬臂梁流固耦合仿真模型，分析柔性梁在流场中的力学环境及颤振机理；探究压电悬臂梁在亚颤振临界风速及超颤振临界风速条件下电压输出特性及其给电容充电的性能。结果表明，当风速低于颤振临界速度时，单个压电悬臂梁输出电能较小，接近于零。当风速高于颤振临界速度时，输出电压为类正弦曲线，峰值可达20V。在超颤振临界速度条件下，单个压电悬臂梁为10μF电容充电10s可达22V。微型压电发电机为低功耗微机电系统设备供电成为可能。

Experimental and Simulation Study of Wind Induced Based Piezoelectric Generator

With the development of low-power MEMS device, more and more micro-generators have emerged, of which piezoelectric generators are typical representatives. This paper intends to conduct experimental and simulation study on Wind Induced Based Piezoelectric Cantilevers. The main contents include two parts. First, establishing fluid-structure interaction simulation model and analyzing mechanical environment and flutter mechanism of flexible beam submerged in axial flow. Second, investigating the voltage output characteristics of piezoelectric cantilever under the conditions of subcritical flutter velocity and supercritical flutter velocity. The output voltage and the charging performance under the conditions of subcritical and supercritical flutter velocity are explored. The results show that the peak output voltage is approximately 20V under the conditions of supercritical flutter velocity and close to zero under the conditions of subcritical flutter velocity. A single piezoelectric cantilever can charge a 10μF capacitor up to 22V in 10s. This paper illustrates the possibility of charging low-power MEMS devices with Micro-piezoelectric generators.