磨损轮廓与弹性变形对滑靴动态特性的影响

Effects of Wear Profile and Elastic Deformation on the Slipper's Dynamic Characteristics

考虑滑靴的倾斜与底面实际磨损轮廓,结合滑靴实际受力状况,建立描述滑靴微观运动的动力学方程,对滑靴的刚度分布特性进行研究从而引入底面流体压力所导致的结构弹性变形所带来的影响。联立动力学方程、瞬态二维雷诺方程、油膜描述方程,弹性变形方程,油室压力控制方程,实现滑靴动力学特性与摩擦特性的耦合求解,获得整个工作周期内滑靴的微观运动状态,实现滑靴副润滑特性的精确计算。探讨微观磨损几何、滑靴底面的流固耦合效应对滑靴动态油膜特性的影响。分析结果表明,一定的磨损轮廓与弹性变形均可以保证滑靴承载特性的稳定性,较大的磨损轮廓会降低滑靴的承载力并使滑靴最小膜厚降低;当滑靴位于低压吸入区时,具有表面磨损轮廓的滑靴会出现很大的倾斜现象;磨损轮廓与弹性变形对滑靴的摩擦转矩特性也存在一定的影响。

Considering tilt and actual wear profiles of slipper and combining the external forces on slipper, the dynamic equations to describe micro-movement of slipper are established. In order to introduce the elastohydrodynamic lubrication effect caused by the pressure distribution under the slipper, the slipper＇s stiffness characteristics are studied. The slipper＇s kinetic equation, transient Reynolds equation, oil film description equation, elastic deformation equation and recess pressure governing equation are solved simultaneously to obtain the coupled solution of slipper＇s dynamics and tribology. The lubrication properties and the micro-movement of slipper in whole working cycle are obtained. Moreover, micro-wear profiles and surface deformation effects on the slipper＇s dynamic characteristics are analyzed as well. The results show that wear profiles to some extent and elastic deformation can guarantee the stability of slipper load capacity, while large wear profile lead to reduction of carrying capacity and decrease the slipper＇s minimum film thickness. When slipper with wear surface profile locates in low pressure suction area, it will tilt heavily. Wear profile and elastic deformation have some influences on friction torque.