飞机舵机组合O形密封件密封性能与摩擦热效应的数值分析

Numerical Analysis on Friction Heat Effectand Sealing Property for Combination O-ring Sealing of Aircraft Actuator

飞机舵机一般采用橡胶-聚四氟乙烯组合O形密封件密封活塞杆高压端面,舵机工作时的摩擦发热会导致密封件的密封性能下降。为研究密封性能的热效应,利用ABAQUS软件建立考虑三重非线性(材料非线性、几何非线性以及边界非线性)的热-结构耦合效应的组合O形密封件有限元模型,分析密封件在不同油压下的接触压力分布及密封性能。开发ABAQUS的重启动功能,研究不同油压、滑动速度以及摩擦因数3种因素对密封件在活塞杆滑动过程中的摩擦生热影响,得到密封件的局部温度场分布,探讨3种因素对温度场的影响规律。分析结果表明:密封件在活塞杆滑动过程中的最高温度随着油压、滑动速度和摩擦因数的增大而增大,其中摩擦因数的影响最为显著。

Aircraft actuator usually uses rubber-PTFE combination O-ring to seal the high pressure end surface of piston ,while the sealing property of O-ring will decline due to the friction heat produced by actuator.In order to study the heat effect on sealing property, the FEM model of combination O-ring with consideration of the heat-structure coupling effect of triple nonlinear （material nonlinearity, geometric nonlinearity and boundary nonlinearity ） was established by using ABAQUS software.The contact pressure distribution and sealing property of O-ring under different oil pressures were analyzed.Based on the restart function of ABAQUS,the effect on friction heat by different oil pressures, sliding velocities and friction coefficients during the sliding process of piston was studied, the local temperature field distribution of O-ring was obtained, and the influence laws of three factors on the temperature field distribution were discussed.Analysis results indicate that the highest temperature of O-ring during the process of sliding is increased with the increasing of oil pressure, sliding velocity and friction coefficient, among which friction coefficient has the most significant effect on the highest temperature of O-ring.