A study on horizontal vibration characteristics of cold rolling mill’s work roll under combined excitation
LI Li1,2,HAO Yuchao2,LI Zhen2
1. School of Mechanical Engineering, Beijing University of Science and Technology, Beijing 100083, China;
2. School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
Abstract:Aim to study the combined vibration of the cold rolling mill under multi-frequency excitation in the horizontal direction, an approximate expression of the analytical solution of the corresponding mechanical model is obtained by the multi-scale method. When the sum of the three excitation force frequencies is close to the natural frequency of the system, Analyze the influence of the system's nonlinear vibration amplitude-frequency response curve by the change of stiffness and damping coefficient. Simulation shows that the horizontal system has a jumping phenomenon and unstable regionsdue due to the influence of nonlinear factors. It is beneficial to suppress the horizontal vibration by the linear stiffness, linear damping, nonlinear damping of the system are increased, or the nonlinear stiffness is reduced; at the same time, it is found that the work roll the horizontal vibration period will alternate between the double period and the chaotic period as the excitation amplitude value changes. A reasonable selection of the excitation force amplitude range is beneficial to suppress the generation of chaotic motion; Phenomenas of the rolling mill's horizontal vibration displacement and collision can be effectively suppressed by reducing the gap between the bearing housing and the column. It provides an effective theoretical reference to suppress the rolling mill's horizontal vibration.
Key words:cold rolling mill; multi-scale method; amplitude frequency response curve; combined vibration
李丽1,2,郝宇超2,李震2. 组合激励下冷轧机工作辊水平振动特性研究[J]. 振动与冲击, 2022, 41(16): 135-141.
LI Li1,2,HAO Yuchao2,LI Zhen2. A study on horizontal vibration characteristics of cold rolling mill’s work roll under combined excitation. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(16): 135-141.
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