非接触机械密封的非线性动特性系数及瞬态振动响应分析

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建立了考虑倾斜情况的弹性补偿单元支撑的非接触机械密封瞬态振动响应分析模型,该模型包括了瞬态Reynolds方程、运动方程以及二阶非线性动特性系数求解方程等。采用Euler法求解获得了非接触机械密封在轴向振动位移和静环倾角随时间变化时的瞬态振动响应特性。计算得到瞬态油膜力作用下的密封轴向力和倾覆力矩相关的14个动特性系数。结果表明：密封间隙内流体阻尼对密封副和摆动的影响是线性的;密封副瞬态振动影响油膜厚度分布,从而引起油膜压力分布发生变化,结果导致密封环发生摆动;密封副摆动同样也会引起密封轴向振动。 Considering the tilt of a seal ring, the transient vibration response analysis model of a non--contact mechanical seal was presented. The model was consisted of transient Reynolds equation, motion equation and equation for solving the second--order nonlinear dynamic coefficients of the seal. With Euler method, the characteristic parameters of the transient vibration response were obtained, which included the axial vibration displacements and the angle--swing of the static ring. 14 nonlinear forces and 14 nonlinear overturning moment dynamic coefficients for the non--contact mechanical seal were calculated. The results show that the influences of the damping effects of the sealed fluid between the seal gaps on the axial vibration displacements and the angle--swing are linear. The film thickness distribution changes with the axial vibration of seal, which will lead to static ring swing, and the swing can also cause the axial vibration of the seal.