一种准零刚度隔振器的隔振性能分析及实验研究

Analysis and Experimental Study of Vibration Isolation Performance for a Type of Quasi-zero-stiffness Vibration Isolator

提出一种套筒结构从而解决了螺旋弹簧易因压缩而发生屈曲变形导致实验失败的问题。建立了准零刚度隔振器的理论模型,使用慢变平均法得到了其在简谐激励下的幅频响应曲线。通过振动实验研究准零刚度隔振器的隔振性能。简谐振动实验结果与理论分析结果基本一致,表明新式弹簧设计能够用于准零刚度隔振器的振动实验。此外,对准零刚度隔振器进行随机振动实验研究,证实了其在低频隔振和宽频隔振方面的优势。

A sleeve-spring structure was proposed and designed to modify the traditional coil spring,which can be prone to buckling in the compression stage resulting in the failure of the experiment.Meanwhile,the theoretical model of the quasi-zero-siffness(QZS)isolator was built,and the amplitude-frequency response curves of the proposed system subjected to harmonic excitation were derived with the averaging method.An experiment of QZS vibration isolator with sleeve-spring structure was implemented to study its vibration isolation performance.Harmonic vibration experiment showed that the experimental result was coincided with the theoretical analysis,which proved that the new spring design can be exploited effectively in vibration experiment.Furthermore,the random vibration test of QZS vibration isolator was executed,which indicated that QZS vibration isolator could be superior to linear one in performance of low-frequency and broadband vibration isolation.