油垫可倾式静动压混合支承摩擦副变形

液体静压支承在高速重载工况下运行时，由于强挤压和高速剪切联合作用，微间隙油膜温度和油腔压力分布不均匀，导致静压支承摩擦副发生热固耦合变形，影响液体静压支承的承载能力和高精度稳定运行。为了解决该难题，提出一种新型油垫可倾式静压支承结构，其运行过程中可实现任意方向微摆，产生附加动压，形成静动压混合支承，达到高速重载工况条件下静压支承高精度稳定运行的目的。依据流热固耦合理论，采用ANSYS Workbench对支承摩擦副变形进行流热固耦合分析，探讨承载0 t~32 t极端工况条件下旋转工作台、可倾油垫和底座的流热固耦合变形规律。提取变形数据，并经MATLAB编程处理后得到摩擦副变形关系，发现油腔外侧封油边边角处变形最大，此处间隙油膜最薄，最易发生摩擦学失效，成果为进一步控制摩擦副变形和摩擦学失效机理研究提供新方法。

DEFORMATION OF FRICTION PAIRS OF STATIC AND DYNAMIC PRESSURE HYBRID BEARING WITH TILTING OIL PAD

During the operation of the hydrostatic bearing under high-speed and heavy-load conditions,due to the combined effects of strong extrusion and high-speed shear,the temperature and pressure distribution of micro-gap oil film are not uniform,resulting in fluid-heat-solid coupling deformation of the hydrostatic bearing friction pairs.In order to solve this problem,a new type of hydrostatic bearing structure with tilting oil pad is proposed,which can realize micro-swing in any direction during operation,generate additional dynamic pressure and form a static and dynamic hybrid bearing to achieve high-speed and heavy-load working conditions.Based on the fluidthermo-solid coupling theory,ANSYS Workbench is used to analyze the deformation of the hydrostatic bearing friction pairs,and the fluid-thermo-solid coupling deformation law of the rotational worktable,tilting oil pad and base under the extreme operating conditions of 0 t~32 t is discussed.The deformation data is extracted and then the deformation relationship of the friction pair is obtained by using MATLAB program.It is found that the deformation at the corner of the outer sealing oil side of the oil cavity is the largest,where the gap oil film is the thinnest and the tribological failure is most likely to occur,and the results provide a new method for further control of friction pairs deformation and tribological failure mechanism.