电液伺服作动器静压支承的动态性能分析OA北大核心

To improve the anti-eccentric dynamic performance of constant pressure hydrostatic bearings in electro-hydraulic servo actuators,a dynamic model for bearing anti-offset is developed.The effects of orifice,annular gap,and bearing cavity size on dynamic performance are systematically analyzed.The research results indicate that the maximum bearing capacity occurs when the initial bearing cavity pressure is 50％of the supply pressure.This leads to the derivation of the matching relationship between fixed damping holes and variable gap damping.A correlation between fixed damping orifice and variable annular gap orifice is derived.Under the conditions of a piston rod diameter of 40 mm and a radial offset force of 2000 N,using a damping hole with a diameter of 0.3 mm and a length of 10 mm,and a sealing surface with a unilateral clearance of 43 μm,the flow loss of the actuator static pressure system at 15 L/min can be controlled at 12％.Furthermore,the study reveal a positive correlation between rod eccentric overshoot and the ratio of bearing cavity volume to non-eccentric flow.When this ratio exceeds 11％,increasing the risk of seal failure and creeping phenomenon.The research results provide theoretical guidance and design reference for optimizing the hydrostatic bearing of electro-hydraulic servo actuator.