Torsional vibration often arises in the main transmission system, because the load disturbance and the elastic connection between the motor and the roller hinder the performance improvement in the speed control system, especially biting, throwing and the strong impact of load changing. 由于负载扰动的影响和电机与轧辊之间的弹性连接阻碍速度控制系统性能的提升,特别是在轧机咬钢、抛钢,以及负荷变化产生强冲击时,主传动系统经常会发生扭振。