静偏心对挤压油膜阻尼器减振特性影响的 数值分析

由于装配误差或重力等原因,挤压油膜阻尼器在实际使用中难以避免产生静偏心。为了研究静偏心对挤压油膜阻尼器减振特性的影响,基于广义雷诺方程推导出静偏心条件下挤压油膜阻尼器雷诺方程并建立了静偏心挤压油膜阻尼器-转子系统的动力学模型,随后运用数值积分获取静偏心下转子系统的非线性响应。研究表明:转子进动半径随着静偏心增大而减小;静偏心显著影响转子轴心轨迹,静偏心时转子轴心轨迹在大多数转速下近似为椭圆而不再是圆,静偏心下突加不平衡响应瞬态振幅远高于无静偏心条件下瞬态振幅。

Numerical Analysis of Effects of Static Eccentricity on Vibration Characteristics of Squeeze Film Damper

Due to the assembly error or the weight, the static eccentricity can''t be avoided in use of SFD (Squeeze Film Damper). To research the effects of static eccentricity on vibration characteristics of the SFD, the Reynolds equation of SFD under conditions of static eccentricity was derived based on generalized Reynolds equation,, and a dynamic model of the SFD with static eccentricity- rotor system was established. Then, the nonlinear response of the rotor system under conditions of static eccentricity was obtained by using numerical integration. The results show that the rotor precession radius decreases with the static eccentricity; the static eccentricity has a marked influence on the rotor shaft orbit, when there is static eccentricity, the rotor shaft orbit is close to ellipse instead of circle at most speeds, and the instantaneous amplitude of sudden unbalance response is far above that without static eccentricity.