多干扰源下热连轧机主传动系统扭振问题研究

针对热连轧机主传动系统扭转振动问题,考虑非线性刚度及阻尼项,建立连轧机在电机谐波干扰及负载谐波干扰下的主传动系统扭转动力学模型。采用多尺度法求解非线性动力学系统的1/2倍亚谐、2倍超谐及组合共振幅频响应方程。以某钢企中1 580 mm热连轧机F2主传动系统为例,分析实际参数下不同非线性刚度、非线性阻尼、电机扰动及线性阻尼对主传动系统亚谐、超谐及组合共振的幅频响应的影响。研究结果为揭示热连轧机主传动系统非线性动力学特性问题机理提供实用参考。

Research on Torsional Vibration of Main Drive System of Hot Strip Mill under Multi Disturbance Sources

For the torsional vibration issue in the hot strip mill, the torsional vibration dynamic model of the main drive system is established under the harmonic disturbance of motor and load when the nonlinear stiffness and damping are considered. The multiscale method is used to solve the 1/2 subharmonic, 2-fold superharmonic and combined response equations for the nonlinear dynamic system. The F2 main drive system of a 1580 mm hot strip mill is analyzed, the amplitude-frequency response including subharmonic, superharmonic and combined resonance is obtained under the effect of actual parameters such as nonlinear stiffness, nonlinear damping, motor disturbance and linear damping. The results of the research provide a practical reference for revealing the mechanism of nonlinear dynamic characteristics of the main drive system for the hot strip mill.