剪切粘滞阻尼器在线消除油膜支承转子碰摩振动研究

Shear viscous damper for on-line elimination of rubbing vibration of a rotor supported by oil film bearing

针对工作环境恶劣及结构紧凑场合,提出新型剪切粘滞阻尼器在线消除转子碰摩振动。用有限元理论研究该阻尼器对支撑在滑动油膜轴承的单盘碰摩转子系统抑振作用。其数学模型为含非线性碰摩力、线性油膜力及外加剪切阻尼力的振动系统,并采用四阶Runge-Kutta方法进行数值计算,对比分析碰摩转子在施加该阻尼器后的振动响应。在理论分析基础上进行实验验证。仿真计算与实验结果表明该阻尼器可有效消除碰摩转子系统复杂轴心轨迹及二倍频等高频振动幅值。

A new shear viscous damper for on-line elimination of rotor rubbing vibration was proposed aiming at fitting the rotor to the poor working conditions and compact structure case environments. The vibration suppression effect of the damper on a single disc rotor system supported by sliding film bearings was theoretically studied by using the finite element method. Its mathematical model was created as a vibration system including nonlinear rub force,nonlinear oil film force and the applied shear damping force. Its numerical solution was obtained by using the fourth-order Runge-Kutta method. The vibration response of the rubbing rotor with the damper installed was analyzed comparatively. The results of the numerical simulations were verified by the experimental study. The simulation and experiment results show that the damper can effectively eliminate the complicated rub orbit and mitigate the double frequency or other high-frequency vibrations.