Fractal model for the normal contact stiffness of frictional interface in dry gas seals

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 248-255.

SUN Baocai1,2，DING Xuexing1，CHEN Jinlin1，ZHANG Weizheng1, YAN Ruqi2

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Abstract

In order to reveal the frictional vibration behaviors of the frictional interface in dry gas seals, the end face morphology of dry gas seals was characterized by fractal parameters.According to a re-established contact deformation model for the micro-convex body and the probability theory,a fractal model for the normal contact stiffness of dry gas seals was established.The rationality and correctness of the model was verified by the comparison of the related experimental data with the model results.The key factors influencing the normal contact stiffness were analyzed numerically, and the results show that the normal contact stiffness increases with the increase of the fractal dimension and real contact area.When the contact area is fixed, the normal contact stiffness decreases with the increase of the characteristic scale and friction coefficient.The effect of the coefficient of friction on the normal contact stiffness is relatively small compared to the fractal dimension and the characteristic scale.The results provide a foundation for further study of the frictional vibration of dry gas seals.

Key words

dry gas seal / frictional interface / fractal theory / asperity / normal contact stiffness

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SUN Baocai1,2，DING Xuexing1，CHEN Jinlin1，ZHANG Weizheng1, YAN Ruqi2. Fractal model for the normal contact stiffness of frictional interface in dry gas seals[J]. Journal of Vibration and Shock, 2019, 38(18): 248-255

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