密封环扰动状态下稳定性分析及动态响应

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 179-182.

论文

密封环扰动状态下稳定性分析及动态响应

宫燃1; 葛如海1; 谢明祥2

作者信息 +

Stability and dynamical characteristic investigation on small perturbation of seal

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

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文章历史 +

摘要

应用微扰方法和数值计算对重载车辆传动装置密封环在扰动状态下的稳定性及其动态响应进行分析。根据传动装置密封环的工作特点，建立了密封环三自由度的扰动模型，采用有限差分法求解时变雷诺方程，模拟实际运行工况，应用动态参数计算模型，对密封油膜的刚度和阻尼系数进行了数值求解，分析了角微扰动与偏转力矩的关系，研究了密封轴向、周向的刚度系数和阻尼系数随工况条件的变化规律，预测对密封面碰摩的影响。结果表明，油膜厚度对系统的刚度和阻尼系数影响较大，在膜厚较大时，密封的不稳定性增强。同时随着工况条件的变化，特别在Pv值较大时，刚度系数增长较快。适当控制膜厚和合理配置传动装置的转速和输入压力，对预防密封碰摩较为有利。

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.

导出引用

宫燃; 葛如海; 谢明祥. 密封环扰动状态下稳定性分析及动态响应[J]. 振动与冲击, 2011, 30(8): 179-182

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