Friction And Lubrication Research On Vane Sealing With Considering Surface Topography

The vane seal is an important element of Rotary vane actuator,the lubrication and frication of which is directly related to the service behavior and service life of it.At run time,there will be a lubricant film between vane seal and the sealed surface,the distribution of which can determine the friction,wear and leakage of the vane seal and also works as a major parameter to evaluate the sealing performance of Rotary vane actuator.Moreover,the Surface topography of the vane seal plays a decisive impact in the study of film pressure and film thickness.Therefore,this paper will focus on the vane seal in the use of numerical simulation and experimental research to study the the influence of surface topography on the lubrication and friction of the vane seal.The main content is showed as follow:(1)As for the research on the lubrication and friction of vane seal: by using the elastic theory of generalized Hooke’s law,the pressure distribution of vane seal on the contact surface has been calculated.Also,on the basis of equation and micro convex body contact model,the fluid lubrication analysis model of vane seal has been established to study the change rules of the pressure and thickness of film,friction force and leakage on the different surface.The results show that the surface roughness of van e seal will increse the friction force and leakage and result in more wear loss of the vane seal.Moreover,the friction force and wear increases and leakage decreases when the surface texture features change from vertical to transverse.Meanwhile,the increase of leakage is not apparent.(2)In terms of the experimental research on vane seal: the UMT-3 has helped to measure the friction coefficient of fully lubricated test-pieces with different surfaces in phase of startup and steady operation.The results show that concerning the steady operation,the increase of surface roughness contributes to the increase of friction coefficient.Futhermore,the friction coefficient in the tranverse perspective decreases,while those in the vertical perspective is the largest,which proves the reliability of the numerical study in this paper.The experimental research has also found that in phase of startup operation,the vane seal with larger amplitude could form a larger friction coefficient,while the influence of surface texture features on the friction coefficient is weak.