Modeling and tests for frequency drift of vibration isolator locked with unloosening bolt on China Space Station

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (15) : 1-10.

HE Keda1, LI Qing1,2, LIU Lei1

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Abstract

A large number of scientific instruments and equipment in the space station need to be locked by unloosening bolts. Aiming at the problem of frequency drift induced by unloosening bolt locking during the development of active vibration isolator for space station, the dynamic mechanism modeling and experimental verification of nonlinear connection of active vibration isolator for space station in locking state are explored.The mechanical analysis of the locking release device of the isolator based on the unloosening bolt is carried out, and the equivalent dynamic model of the system based on the Iwan model is established according to the nonlinear distribution of the stress on the contact surface of the unloosening bolt, and the nonlinear characteristics of the dynamic response are analyzed.The prototype of the active vibration isolator of the space station is developed for sinusoidal vibration test to verify the accuracy and effectiveness of the established dynamic model, which provides a reference for the environmental adaptability design of the space station precision scientific equipment.

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space station / unloosening bolt / frequency drift / nonlinearity / vibration test

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HE Keda1, LI Qing1, 2, LIU Lei1. Modeling and tests for frequency drift of vibration isolator locked with unloosening bolt on China Space Station[J]. Journal of Vibration and Shock, 2024, 43(15): 1-10

References

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