关键词: 压电悬臂梁, 流固耦合, 颤振, 输出电压, 充电特性

Abstract:

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.

Key words: Piezoelectric cantilever, Fluid structure interaction, Flutter, Output voltage, Charging performance