Abstract A friction model for evaluating friction force of a Radial Shaft Sealing Ring (RSSR) in contact with the rotating shaft subjected to unsteady motion is presented. The model takes both the magnitude and the acceleration sign-changes from positive to negative into account and removes the shortcoming of the existing friction models in the sliding domain. It is shown that acceleration has a pronounced influence on the hydrodynamic regime. The results signify that hysteresis behavior exists in the boundary, mixed lubrication and hydrodynamic regimes as well as the pre-sliding domain, making the conventional Stribeck friction model unsuitable for characterization of friction behavior. To account for the hysteresis effect in the hydrodynamic regime, the model incorporates the solution of the unsteady Navier-Stokes equation that accommodates the magnitude as well as the sign change in the acceleration (and, hence, the viscous friction). In addition to the hysteresis, the results show a frictional lag when the motion starts from stick to slip. Test results are presented at low speed, and unknown parameters of the friction model are determined using an experimental test rig.

中文翻译：

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径向轴密封环在非定常运动下的摩擦行为

摘要 提出了一种评估径向轴密封环（RSSR）与旋转轴接触的非定常运动摩擦力的摩擦模型。该模型同时考虑了幅度和加速度符号从正到负的变化，并消除了现有摩擦模型在滑动域中的缺点。结果表明，加速度对水动力状态有显着影响。结果表明，在边界、混合润滑和流体动力学状态以及预滑动域中存在滞后行为，使得传统的 Stribeck 摩擦模型不适用于摩擦行为的表征。考虑到流体动力学状态中的滞后效应，该模型结合了非定常 Navier-Stokes 方程的解，该方程适应加速度的大小和符号变化（以及粘性摩擦）。除了滞后现象外，结果还显示，当运动从粘滞到滑移时存在摩擦滞后。测试结果在低速下呈现，摩擦模型的未知参数使用实验测试台确定。