Comparative research of nonlinear torsional vibration in the drive system with clearances

Considering causes of design, installation and wear, the drive system shows different clearances in a heavy plate mill. The oscillator has repeated impacts in clearance when biting impact or rolling slippage occurs, and the relative amplitude will be increased largely, which is the major factor of most system damage. Based on the 5000 mm heavy plate mill, the torsional vibration models of biting impact and rolling slippage are established respectively. By using the numerical method, the torque amplification factors of biting impact or rolling slippage are calculated, moreover the numerical computation results of dynamic response with clearances and comparative analysis of torsional vibration responses are obtained between different conditions. Combined with engineering practice, the influences of different position and size of clearance on torque amplification factors are analyzed. The results may provide an important theoretical reference to control and analyze the torsional vibration of this kind of rolling mill.