压电-气动隔振器的能量回收特性

Energy Harvesting Performance of Piezo-Pneumatic Vibration Isolator

为实现低频/高强度振动能量回收以及基于能量回收的主动振动控制,提出一种压电-气动隔振器,介绍了其系统构成原理,并进行了其能量回收特性的理论与试验研究。理论分析结果表明,压电-气动隔振器的发电能力是由环境振动强度、气缸/压电振子的结构性能参数、气体容积/背压等多种要素共同决定的。其他条件确定时,发电量/电压随背压增加呈指数规律递增,且存在最佳的压电振子的厚度及厚度比(基板厚度/总厚度)使发电能力最大。采用Φ60×0.9mm3双晶压电振子及Φ16×100mm3气缸制作了试验样机,测试了频率/背压/振动强度对输出电压的影响规律。结果表明,在给定试验条件下,压电-气动隔振器输出电压随背压及气缸活塞振幅的增加线性递增,0.4MPa背压时输出电压约为无背压时的5倍。此外,还存在最佳工作频率(5Hz)使其输出电压最大。

A piezo-pneumatic vibration isolator(PPVI)is presented for energy harvesting of low-frequency/high-level vibration and self-powered active vibration control based on energy harvesting.The structure and working principle of the PPVI are introduced,and the energy harvesting performance is studied theoretically and experimentally.With the established energy-conversion model,the influence factors of the PPVI are picked up and analyzed.The theoretic results show that the output performance of the PPVI depends on the vibration frequency/level,structural size of the piezodisc/cylinder,and gas volume as well as backpressure.Under other constant parameters,the generated energy exponentially increases with the rising backpressure,and there are optimal thickness of piezodisc and the thickness ratio of substrate thickness to total thickness,for achieving the peak energy of the PPVI.With piezodisc measured ofФ60×0.9mm3 and cylinder measured ofФ16×100mm3,a PPVI is fabricated and tested at different frequency/backpressure/vibration levels.The results suggest that,under the given test condition,the output voltage from PPVI increases linearly with the rising backpressure/vibration levels,and the output voltage at backpressure of 0.4MPa is 5times than that without backpressure.Further,there is an optimal vibration frequency(5Hz)for the PPVI to achieve maximal voltage.