Characteristic analysis and experimental investigation of a Vibration isolator with quasi-zero-stiffness

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (11) : 208-213.

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Characteristic analysis and experimental investigation of a Vibration isolator with quasi-zero-stiffness

XU Dao-lin , ZHANG Yue-ying , ZHOU Jia-xi , Zhang Jing

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Abstract

In this paper, a study of a high-static-low-dynamic-stiffness isolator comprising five linear springs is presented. A unique relationship between the geometry and the stiffness of the springs is derived in order to obtain the critical condition of Quasi-Zero-Stiffness (QZS). Dynamic analysis of the nonlinear QZS system is carried out with the harmonic balance method for the characteristic analysis of the force transmissibility. The effects of damping and excitation force on the system transmissibility are considered. To assess the isolation performance of the QZS system, a series of experiments are carried out. From the experimental results it can be seen that the QZS system more greatly outperforms than a corresponding linear system especially in low frequency range.

Key words

Quasi-zero-stiffness / vibration isolator / low-frequency vibration / force transmissibility

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XU Dao-lin;ZHANG Yue-ying;ZHOU Jia-xi;Zhang Jing. Characteristic analysis and experimental investigation of a Vibration isolator with quasi-zero-stiffness[J]. Journal of Vibration and Shock, 2014, 33(11): 208-213