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A method is proposed to analyse and optimize the performance of nonlinear damping vibration isolator based on parallelogram linkage. Establish the vibration differential equation of the system, and perform Taylor expansion of the nonlinear damping coefficient, and then obtain the steady-state response of the system under harmonic excitation through methods such as perturbation method and averaging method. The displacement transfer rate curve of the steady-state response has a high degree of fitting with the curve obtained by the multi-body dynamics software, which proves the accuracy of the method. Taking the resonant peak of the steady-state response as the optimization target, and taking the high-frequency transmission rate as the constraint condition, design and optimize the rod length and damping coefficient of the mechanism. Comparing with traditional damping, the optimized nonlinear damping has a more obvious suppression effect on the resonance peak when both transmission rates of steady-state response are close at high frequencies. The analysis method in this paper is convenient to parameterize and has good programmability, which means that it provides a simple and effective new method for the parameterization and optimization design of the nonlinear damping vibration isolator based on parallelogram linkage.

Research and Optimization of Nonlinear Damping Vibration Isolator based on Parallelogram Linkage