轧机主传动系统扭振减振器参数设计及特性分析

针对咬钢时突加负载时轧机主传动系统轴系的扭振现象,引入扭振减振器控制装置,建立电动机与扭振减振器的扭振抑制模型;通过对扭振减振器特性参数的设计,得出扭振减振器的惯量比、定调比、阻尼比;同时运用定点理论,得到最佳定调比和阻尼比;通过对比加入扭振减振器前后的时域特性曲线,得出扭振减振器能降低振动幅值;通过调节惯量比、扭转刚度、阻尼系数的大小,得出不同参数变化对轧机主传动系统幅频特性曲线的影响规律,适当的增大惯量比μ可以减小振动幅值,增大扭转刚度K_d可以缩小系统的不稳定区域,增大阻尼系数C_d可以有效降低系统扭转振动幅值,因此选取恰当的参数数值能有效提高轧机系统的稳定性。

Parameter Design and Characteristic Analysis of Torsional Vibration Damper for Main Drive System of Rolling Mill

A torsional vibration damper control device is introduced for the torsional vibration phenomenon of the rolling mill main drive system under the sudden load of biting steel. Establishing torsional vibration suppression model of motor and torsional vibration damper. The characteristic parameters of the damper are designed. The inertia ratio, the tonal ratio and the damping ratio of the damper are obtained. Using the fixed point theory, the optimal tuning ratio and damping ratio are obtained. By comparing the time domain characteristic curves before and after adding the torsional vibration damper, it is concluded that the damper can reduce the vibration amplitude; By adjusting the inertia ratio, torsional stiffness and damping coefficient, the influence of different parameter changes on the amplitude-frequency characteristic curve of the rolling mill main drive system is obtained. Appropriate increase of inertia ratio μ can reduce the vibration amplitude, increasing the torsional stiffness Kd can reduce the unstable region of the system, increasing the damping coefficient Cd can effectively reduce the system torsional vibration amplitude. Therefore, selecting the appropriate parameter values can effectively improve the stability of the rolling mill system.