Abstract: In this paper, the transient characteristic of hydrostatic bearing under a step load has been analysed considering the compressibility of oil (containing air bubbles). The characteristic equation of the bearing during the transient stage has been set up, The perdurability and the clearance change of the bearing has been obtained, The effect of the major parameter of the bearing system on the transient characteristics has been analysed also. This study provides a new theory basic for improving the dynamic supporting precision of high-quality bearing.

Key words: Characteristics, Hydrostatic bearing, Load, Drilling load, Drilling parameters, Filling rate, Lunar drilling and coring