关键词: 轧制力, 非线性振动, 幅频特性, 分岔特性

Abstract:

Considering  the dynamic characteristics of  the rolling force influenced by roller  vibration,a  nonlinear vibration model of strip mill roll system  was established.Average method was  adopted to get the amplitude frequency response of the vibration system,the amplitude  frequency characteristics of  the  system were analyzed with the changing rolling   speeds  and  external  excitation  amplitudes.The  singularity theory was  used to analyze the static bifurcation behavior,and to get the transition set and the critical conditions of different forms of vibration behavior of this system.The  dynamic bifurcation behavior was  researched with the  changing rolling  speeds.The  results show that vibration behavior  of  rolling  mill  is  very sensitive to the changing rolling speeds,the vibration amplitude increases  with the increasing of  excitation amplitudes  and rolling speeds,the frequency range of instability decreases with the increasing  of  rolling speeds,increases  with the increasing of  external excitation.The intermittence chaos is appeared with the changing   of  rolling speeds,and the speed range of steadying rolling is obtained with the maximum Lyapunov exponent curve.The results provide  a  theoretical reference for the vibration suppression and guarantying stable operation for rolling.

Key words: rolling force;nonlinear vibration;amplitude , frequency characteristic;bifurcation characteristic