Research on primary resonance response and vibration-isolation performance of vibration-isolation system with displacement restrictors
In this article,in order to explore the common nonlinear characteristics of the shipborne equipment's vibration-i-solation system with displacement restrictors,the mathematical model is set up,which includes piecewise linear stiffness and piecewise linear damping;the average method is used for the analytical solution of the primary resonance response,and the equa-tion of the system's force-transmission rate is derived;the in-depth analysis is conducted on the influence of the restrictors'vari-ous parameters on the system's amplitude-frequency characteristics and vibration-isolation performance,which is verified by the frequency-sweep test.The results show that the damper has a positive effect on the system's vibration performance.A larger damper is helpful to reduce the amplitude-frequency response peak and the force-transmission rate;also,it is beneficial to dwin-dle and even avoid the jumping and hysteresis.As for any set of system parameters,there is an optimal stiffness ratio to minimize the relative displacement amplitude;both the best vibration-isolation performance and a smaller jumping interval are ensured.The jump interval will become smaller thanks to a proper increase of clearance.As a result,the system enjoys better vibration per-formance.
nonlinear vibrationprimary resonance responseforce-transmission ratejumping and hysteresisfrequency-sweep test
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