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为了研究轧机振动特性并找到振源,根据轧制界面非线性粘滑摩擦特性,建立了轧辊水平方向摩擦颤振模型、接轴不平衡力引起的工作辊水平方向“跳振”模型。模型仿真表明,当外扰力幅较小时系统呈现概周期运动,外扰力幅较大时系统呈混沌状态;当机座有间隙时轧辊水平振动波形有削顶现象,系统动力学变差;当采取消除间隙、消除接轴不平衡力措施后,系统的动力学性能得到改善。实测表明,当采取相应措施后振动强度减弱。
In order to study the vibration characteristics of rolling mill and find the vibration source, the horizontal flutter model of the roll and the horizontal direction of the work roll caused by unbalance force are established according to the non-linear stick-slip friction characteristics of the rolling interface. The simulation results show that the system exhibits almost periodic motion when the external disturbance amplitude is small and the system is chaotic when the external disturbance amplitude is large. When the frame has clearance, the horizontal vibration waveform of the roller has the phenomenon of tip-off and the system dynamics becomes worse. When taken to eliminate the gap, to eliminate the imbalance in the joint measures, the system’s dynamic performance is improved. The measured results show that the vibration intensity is weakened when the corresponding measures are taken.