提出了基于颤振机理的微型风能收集器，采用颤振的柔性梁牵引锆钛酸铅（PZT）压电梁发生振动。通过风洞实验研究了柔性梁颤振发生的过程，发现颤振发生在切入临界风速与切出临界风速之间。分析了柔性梁的长和宽对器件性能的影响，发现随柔性梁长度增加，收集器的临界风速、颤振频率、输出电压和功率等性能都减小；随着宽度增加，临界风速基本不变，而颤振频率、输出电压和功率都增加。微型风能收集器的最低临界风速为6.4 m/s，最大输出功率为1.30 mW。结果表明柔性梁结构降低了PZT梁的切入临界风速，提高了输出功率，证实了基于柔性梁颤振结构的微型风致振动能量收集器的可行性。

A fluttering-based miniaturized wind energy harvester is presented. The harvester is comprised of a lead zirconate titanate(PZT) piezoelectric beam and a flexible beam. The flexible beam vibrates the PZT beam when flutter motion triggers. The flexible beam flutter motion is investigated in a small wind tunnel. It’s found that flutter occurs between of cut-in and cut-out critical wind speeds. Effects of the flexible beam length and width on the device characteristics are investigated. It’s found that with the increase of the length, the critical wind speed, fluttering frequency, output voltage and power of the device decrease. While with the increase of the width, the critical fluttering speed is nearly unchanged, and the fluttering frequency, output voltage and power of the device all increase. The minimum critical wind speed of the harvester is 6.4 m/s and the maximum power is 1.30 mW. The results show that the flexible beam structure can reduce the critical wind speed and increase the output power of the PZT beam. The feasibility of the wind-induced vibration energy harvester is confirmed.

高等学校博士学科点专项科研基金资助项目（20090191110009）