不同润滑介质下气体静压轴承气锤自激振动研究

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Abstract In order to study the influence of different lubricating media on the self-excited vibration of pneumatic hammer of aerostatic bearing, the single-degree-of-freedom vibration model of the bearing system was established by coupling the time-varying governing equation of the gas film flow field, the flow balance equation and the rotor force equation. The finite difference method was used to numerically solve the model, and the transient response curve of gas film vibration velocity was obtained to determine the stability of the bearing, and the reliability of the model and the validity of the program were verified through experiments. The calculation results show that the use of xenon can effectively reduce the occurrence of self-excited vibration of the pneumatic hammer; for the mixed gas of xenon and air, as the volume ratio of xenon increases, the attenuation trend of the gas film vibration velocity curve is strengthened, and the stability of the bearing is improved, the supporting force of the bearing is improved, and the higher the gas supply pressure, the greater the range of support force increases. When the xenon volume ratio increases from 0 to 0.6, the bearing supporting force increases rapidly, and the critical gas supply pressure also continues to increase. When the xenon volume ratio exceeds 0.6, the bearing support force and critical gas supply pressure increase slowly. Considering the cost, the xenon volume ratio of 0.6 can be used as the optimal volume ratio. This study provides a new idea for the suppression of self-excited vibration of pneumatic hammer of aerostatic bearing.

Key words： lubricating media aerostatic bearing self-excited vibration of pneumatic hammer mixed gas supporting force

Received: 02 December 2021 Published: 28 February 2023

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	AN Lei
	WANG Wei
	GONG Weiwei

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AN Lei,WANG Wei,GONG Weiwei. A study on self-excited vibration of the pneumatic hammer of an aerostatic bearing under different lubricating media[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(4): 185-193.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I4/185

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