压电堆式JG型复合隔振器结构设计与实验研究

Structural Design and Experimental Research of JG Hybrid Isolators using Piezostacks

复合式隔振器由剪切型橡胶隔振器与惯性式压电堆作动器组合而成,复合式隔振器结合主被动隔振器的优点,将主动构件与被动装置串联、并联,不仅可提高主动构件的稳定性,还能拓展被动隔振的有效频带。通过理论与实验方法对惯性式压电堆作动器的工作原理与动力学特性进行分析,利用所设计的压电堆式JG型复合式隔振器搭建双层隔振台架,采用滤波x-LMS自适应算法对台架进行主动控制。结果表明,在单频正弦激励下压电堆式JG型复合隔振器比单纯被动隔振装置具有更好隔振效果,80 Hz、90 Hz和110 Hz处隔振效果分别提高15 dB、16 dB和15 dB。

The operation principle and dynamic characteristics of the inertia-type piezostack actuator are analyzed theoretically and experimentally. A hybrid isolator is designed and manufactured by combining a shear-type rubber isolator and an inertia-type piezostack actuator. A double isolation platform is established using the JG type hybrid isolator with the piezostacks. Active control of this platform is carried out using x-LMS algorithm. The results show that the JG type hybrid isolator based on the piezostacks has better isolation performance than that of the pure passive element under single-frequency excitation.