Design and research of QZS vibration isolator with double link-spring-curved surface mechanism

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 220-229.

WANG Zhicheng, WANG Shenlong, YU Huijie

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Abstract

Based on the parallel connection principle of positive and negative stiffnesses, taking double link-spring-curved surface mechanism as negative stiffness mechanism and a vertical spring as positive stiffness mechanism, a new configuration of quasi-zero stiffness (QZS) vibration isolator was proposed.According to the above configuration, through static analysis, the displacement-stiffness characteristics and displacement-restoring force characteristics of QZS system were studied to obtain QZS condition under the system’s static equilibrium.Nonlinear dynamic equations of QZS system were established and solved with the harmonic balance method and Runge-Kutta method.Aiming at different excitation amplitudes, damping coefficients and QZS parameters, dynamic response and transmissibility characteristics of the system were studied.The theoretical study showed that the proposed QZS configuration can effectively reduce the system model’s resonance frequency and the maximum transmissivity amplitude.Finally, based on the 3-D model of QZS isolator, numerical simulation and test study showed that the proposed QZS configuration has better low-frequency vibration isolation performance, and has the same high-frequency vibration isolation performance as linear system.

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double link-spring-curved surface mechanism / quasi-zero stiffness (QZS) / harmonic balance method / Runge-Kutta method / transmissibility

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WANG Zhicheng, WANG Shenlong, YU Huijie. Design and research of QZS vibration isolator with double link-spring-curved surface mechanism[J]. Journal of Vibration and Shock, 2021, 40(11): 220-229

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