Abstract: According to the working conditions of sealing rings, the prediction model is presented for frictional contact in the sealing system based on load-sharing concept. Setting the load-sharing factor, the total applied load is supported by the combination of hydrodynamic film and asperity contact. The total friction coefficient is determined by the friction force of hydrodynamic film, asperity contact and contact load. The results are plotted as a function of the velocity, pressure and surface roughness which cover the entire lubrication condition including full-film, mixed-lubrication and boundary-lubrication. An experimental investigation is performed in the dynamic sealing performance test rig by comparison of numerical and experimental results to enable an assessment of the accuracy level. Experimental results indicate that virtual prediction data agree well with test data. Consequently the proposed model can investigate the influence of operating condition on the behavior of friction coefficient efficiently, and a reliable approach is provided to predict the contact state of sealing ring.

Key words: Friction coefficient, Frictional behavior, Rough surface, Sealing ring