In order to reduce wear, lubrication medium will be added to the mechanical joint surface in the actual work. Therefore, the deformed part for asperity of joint surface is equivalent to the conical asperity, and the three-dimensional fractal model for normal contact stiffness of mixed lubrication joint surface is established based on the fractal theory and improved W-M function. Simulation is carried out for the model. According to the simulation results, the dimensionless total normal contact stiffness on mixed lubrication joint surface increases firstly and then decreases with the increase in fractal dimension, and reaches the maximum when the fractal dimension is about 2.6; the dimensionless total normal contact stiffness decreases with increase in fractal roughness parameter, and increases with increase in acoustic impedance of lubricating medium; The dimensionless total normal contact stiffness of mixed lubrication joint surface is greater than that of the joint surface without lubrication medium; Finally, compared with other models and the experimental data, the model is more consistent with the experimental data, which also verifies the correctness. The three-dimensional fractal model of normal contact characteristics of mixed lubrication rough surface provides a good basis for the stiffness prediction of joint surface, the performance optimization and structural improvement of mechanical equipment.
LAN Guosheng, JI Chenglong, LI Xiang, LI Shengqi, LI Yong, YANG Qi.
Normal contact stiffness model of mixed lubrication joint surface[J]. Journal of Vibration and Shock, 2023, 42(17): 220-227
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