电液伺服作动器静压支承的动态性能分析  

Dynamic Performance Analysis of Electro-hydraulic Servo Actuator with Hydrostatic Bearing

作　　者：黄文哲 陈新元[1,2] HUANG Wenzhe;CHEN Xinyuan(School of Mechanical Automation,Wuhan University of Science and Technology,Wuhan,Hubei 430081;Key Laboratory of Metallurgical Equipment and Control,Ministry of Education,Wuhan University of Science and Technology,Wuhan,Hubei 430081)

机构地区：[1]武汉科技大学机械工程学院,湖北武汉430081 [2]武汉科技大学冶金装备及其控制教育部重点实验室,湖北武汉430081

出　　处：《液压与气动》2025年第2期79-86,共8页Chinese Hydraulics & Pneumatics

摘　　要：为提升电液伺服作动器中恒压式静压支承的抗偏载动态性能,构建支承抗偏载的动力学模型,分析了阻尼孔、环形间隙及支承腔尺寸对支承动态性能的影响。结果表明:支承腔初始压力为供应压力的50%时,支承能力最大,得到固定阻尼孔与可变间隙阻尼的匹配关系。在活塞杆直径40 mm、径向偏载力2000 N条件下,采用直径0.3 mm、长度10 mm的阻尼孔和43μm单边间隙的封油面,可将15 L/min的作动器静压系统流量损耗控制在12%。活塞杆偏心超调量与支承腔体积和无偏心流量的比值呈正相关。当该比值超过11%时,活塞杆与缸壁接触,带来密封失效及运动卡滞的风险。研究结果为电液伺服作动器静压支承的优化设计提供了理论参考与设计依据。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 43μm,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.

关 键 词：静压支承 电液伺服 作动器 抗偏载 

分 类 号：TH137[机械工程—机械制造及自动化]