Static and Dynamic Characteristics of Micro-hole Throttling Aerostatic Bearings in Vacuum Environment

doi:10.3901/JME.2025.05.087

Abstract

Abstract: At present, it is difficult to adapt the air-float micro-low-gravity simulation test in the atmospheric pressure environment to meet the high-precision requirements of agile manoeuvre attitude control for remote sensing satellites. The air-float technology in vacuum environment is an important way to achieve the micro-low-gravity simulation test without wind resistance and high fidelity. The study focuses on the micro-hole throttling aerostatic bearing, a key component of ground high-fidelity micro-low-gravity simulation experiment, and investigates the static and dynamic characteristics of the aerostatic bearing in vacuum environment. Firstly, the influence of environmental pressure on the flow field in the bearing film is analyzed theoretically. Then, a simulation model is established to calculate the pressure distribution and flow velocity variation in the gas film with different ambient pressures. Finally, the influence of environmental pressure on the static and dynamic performance of the bearing is revealed by the normal pressure and vacuum environment tests respectively. The results show that the decrease of ambient pressure in vacuum environment increases the pressure difference inside and outside of the bearing gas film, which leads to the increase of bearing capacity. At the same time, in vacuum, the pressure drop rate in the bearing gas film is accelerated, the gas velocity is increased, and the vortex area is increased, which leads to the decrease of dynamic stability and easy to induce the self-excited vibration of the bearing.

Key words: vacuum environments, micro-hole throttling, micro-low-gravity simulation, static and dynamic characteristic, experimental research

CLC Number:

TH133

KOU Xinjun, YU Hechun, ZANG Libin, LI Guangpin, HOU Yueting, LI Peng, ZHANG Guoqing, HOU Weijie. Static and Dynamic Characteristics of Micro-hole Throttling Aerostatic Bearings in Vacuum Environment[J]. Journal of Mechanical Engineering, 2025, 61(5): 87-96.

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