Equivalent Modeling and Frequency-dependent Damping Characteristics Analysis of a Four-parameter Isolator Based on Friction Damping

doi:10.3901/JME.2023.05.192

Abstract

Abstract: The high-precision payloads carried by on-orbit satellites are extremely sensitive to the environmental micro-vibration, which puts forward higher requirements for the performance of vibration isolators. In order to improve the vibration isolation performance, the traditional two-parameter passive vibration isolator usually adopts the method of adding constant damping for energy dissipation, but there is an inherent contradiction between the suppression of resonance peaks and the rapid attenuation of vibration at high frequency. To solve this problem, a four-parameter vibration isolator with damping varying with frequency is proposed. The theoretical model of the system transmissibility and equivalent damping are established by normalization method, and the vibration isolation performance is compared with the two-parameter and three-parameter vibration isolators. Based on the theory of frequency-dependent equivalent damping, a specific four-parameter vibration isolator with friction damping generated by piezoelectric ceramics actuator is designed, the fusion problem of nonlinear friction damping is considered, and the influence of the intermediate equivalent mass on its frequency-dependent characteristics of damping is analyzed. Finally, the frequency-dependent damping characteristics and vibration isolation performance were verified by simulation and experiment. The results showed that: in the time domain, the isolation ratio of the four-parameter vibration isolator for random signals reaches 91.1%; in the frequency domain, the peak value of the four-parameter vibration isolator at the natural frequency is 5.46 dB higher than the system with small and fixed damping, and the rapid attenuation of vibration is maintained in the high frequency range, which exhibits the frequency-dependent damping characteristics of large damping at low frequency and small damping at high frequency. Both the simulation and experimental results show that the isolator can well overcome the contradiction of vibration isolation performance between the high-frequency and low-frequency existing in passive vibration isolators.

Key words: four-parameter system, frequency-dependent damping, vibration isolator, normalized model, friction damping

CLC Number:

TH113
TP13

WANG Min, LIAO Songquan, SUN Yi, DING Jiheng, PU Huayan, LUO Jun, LIU Qingyu. Equivalent Modeling and Frequency-dependent Damping Characteristics Analysis of a Four-parameter Isolator Based on Friction Damping[J]. Journal of Mechanical Engineering, 2023, 59(5): 192-201.

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