Abstract: Slippage is the major factor of torsional vibration generated by the most rolling mill of main drive system, and it’s one of the causes which lead to destruction. Based on the methods of theoretical modeling and numerical simulation for 5 000 mm heavy plate mill, the influence laws of the main drive system with multi-clearance and different clearances simplified form on vibration performance are investigated under the rolling slippage. A four-degree-of-freedom nonlinear torsional vibration model with multi-clearance of main drive system is established. By using the Runge-Kutta method and Matlab simulation, the numerical computation results of system dynamic response with impact of multi-clearance are shown. The influence of different clearances simplified forms on the system dynamic response and the shaft section torque amplification factor, and the influence of the different clearance of the size and location on the system torque amplification factor are analyzed. The results may provide an important theoretical reference to control and analyze the influence of multi-clearance in the engineering practice.

Key words: rolling mill;nonlinear torsional vibration;slippage;multi-clearance;torque amplification factor