Stability and dynamical characteristic investigation on small perturbation of seal

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (8) : 179-182.

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Stability and dynamical characteristic investigation on small perturbation of seal

GONG Ran1 ;GE Ru-hai1; XIE Ming-xiang2

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Abstract

A coupled method based on the small perturbation method and numeric computation was presented to estimate stability and dynamical response of seals assembled in the transmission of vehicle. According to the working conditions of sealing rings, the stiffness and damping coefficients of a fluid film was calculated with three degrees of freedom for a face seal. With the analytical model for dynamic parameters built and the time-variant Reynolds equation solved by numerical method, the relationships between angular perturbations and deflection torque was discussed. The variable curves of the stiffness and damping coefficients with pressure and rotating speed were obtained, and the real impacts of sealing face wear were predicted. Numerical results show that the fluid film thickness has a significant influence on the stiffness and damping coefficients, and when it increased, the sealing unstabilizing factor also increased. The stiffness coefficients increase fairly rapidly with the increase of pressure and rotating speed especially where Pv value is bigger. So it’ll add to the advantage of the prevention of seal wear to control fluid film thickness and rationalize the pressure and rotating speed of transmission appropriately.

Key words

Rotary seal / Small perturbation / Dynamic coefficients / Stability

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GONG Ran;GE Ru-hai;XIE Ming-xiang. Stability and dynamical characteristic investigation on small perturbation of seal [J]. Journal of Vibration and Shock, 2011, 30(8): 179-182