Damping performance of a magnetic liquid vibration absorber for spacecrafts

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (21) : 298-305.

YAO Jie1, LI Hui1, LI Decai1,2, ZHAO Xinyu1, LI Zhenkun1

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Abstract

A vibration absorber based on the magnetic fluid's levitation principle was studied to suppress the low frequency vibration of sizeable, flexible spacecraft structures. The dynamic model of the absorber was established, and the equations of magnetic fluid's buoyant forces and viscous damping forces were derived. According to the magnetic fluid's Bernoulli equation and interface equation, the relationship between the magnetic fluid interface and magnetic field strength was analyzed. Simulation methods were established to calculate magnetic fluid interfaces, buoyant forces, and viscous damping forces. The results show that buoyant and viscous damping forces have good linear characteristics. The influence of shell heights on the magnetic fluid's levitation and viscous damping forces was studied by simulations and experiments, and the difference between simulations and experiments was analyzed. Based on the copper plate's free vibration experiment, the vibration absorber's effectiveness in suppressing low frequency free vibration was verified. Using the vibration absorber, the free vibration of 1.1Hz and 5mm can reduce the vibration time by 85%.

Key words

magnetic fluid / vibration absorber / buoyant force / damping performance

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YAO Jie1, LI Hui1, LI Decai1,2, ZHAO Xinyu1, LI Zhenkun1. Damping performance of a magnetic liquid vibration absorber for spacecrafts[J]. Journal of Vibration and Shock, 2023, 42(21): 298-305

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