摘要
对现场监测信号进行分析,发现热连轧机存在扭振和垂振的耦合振动现象,其振动特征受双动力源作用的影响。建立热连轧机上工作辊分段非线性动力学模型,用Matlab编程进行仿真研究得知:主传动系统扭振和液压压下系统垂振能同时传递给工作辊而影响其振动特征;改变轧制力波动量和扭矩波动量之间的相位角,水平振动和垂直振动也随之发生较大变化;进一步改变轧制力、电机扭矩波动幅值大小时,辊系振动出现分岔和混沌等特性,随着外激励幅值的变化,辊系将表现出周期、倍周期和混沌等不同振动状态。仿真和实测结果相吻合,证明热连轧机上工作辊分段非线性动力学模型的正确性。
Analysis of the field monitoring signal indicates that the coupling vibration phenomenon of torsional vibration and vertical vibration has existed in the hot rolling mill,and the vibration characteristics are influenced by the effect of double power.A piecewise nonlinear dynamic model has been established for the top working roll of the hot rolling mill.Simulation research using MATLAB proves that the main drive system′s torsional vibration and hydraulic screwdown system vibration can be transmitted to the working roll and affect the vibration characteristics.The phase change angle between the rolling force fluctuation and the torque fluctuation will lead to great changes in the horizontal and vertical vibrations.When the amplitude of the rolling force and motor torque fluctuation are changed,the roller′s vibration shows characteristics of bifurcation and chaos.When external incentives amplitude are changed,rollers exhibit different vibration states,such as period,doubling period,chaos and so on.The results of the simulation and actual measurements are identical,proving that the hot strip mill work roll piecewise nonlinear dynamic model is correct.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第3期534-538,594,共5页
Journal of Vibration,Measurement & Diagnosis
基金
吉林省工业高新技术重点资助项目(20080324)
关键词
热连轧机
非线性
耦合振动
双动力源
混沌
hot rolling mill
nonlinear
coupled vibration
double power
chaos
