摘要
为研究热连轧机组F2轧机轧制过程中自激振动产生机理及如何消除轧机自激振动,将轧机主传动系统简化为两固有频率相同的单自由度系统建立扭振模型的非线性动力学方程。用渐进法求解非线性动力学方程。结合仿真分析表明,由于轧制变形区轧制润滑不稳定,使变形区摩擦系数下降出现负阻尼现象导致轧机产生自激振动;合理改变轧制润滑液的动力粘度及轧制速度,可避免轧制系统内产生负阻尼。
In order to research the mechanism of self-excited vibration in rolling process of F2 rolling mill production in a hot strip mill set and to eliminate the self-excited vibration of rolling mill, the main drive system of the rolling mill was simplified into two single degree of freedom systems with equal natural frequency, and the nonlinear dynamical equations of a twist vibration model of the main drive system were established. The progressive method was used to solve the nonlinear dynamical equations. The results of simulation analysis draw the following conclusions： due to the unstable rolling lubrication, the friction in rolling deformation zone declines and causes the negative damping phenomenon, resulting in the self-excited vibration of the mill. Through the field test and theoretical analysis, it is found ： reasonable changes of the dynamic viscosity of rolling lubricating liquid and rolling speed can avoid the appearance of negative damping and eliminate the self-excited vibration of the mill.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第16期161-165,182,共6页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51105284)
关键词
自激振动
负阻尼
轧制润滑
等效摩擦因数
self-excited vibration
negative damping
rolling lubrication
equivalent friction factor
