Analysis on parameter sensitivity and dynamic response of the mill drive system

In the process of rolling, torsion vibration of mill drive system may decrease the lifetime of components, reduce the production efficiency, and also induce harmful effects on quality of product, even damage the equipment performance. Using the lumped-mass method, the main drive chain is described by a branching asymmetrical model with ten-degree-of freedom. The mechanical subsystem and the electrical control loop are coupled through electromagnetic driving torque, and an electromechanical coupling simulation model is synthesized together. Based on this built model, the sensitivity of natural modes to the moment of inertia and the torsion stiffness is analyzed, and the best ways modifying system parameters to modulate the natural frequencies is studied. Under the different slope-load conditions, the evaluation indexes of dynamic speed droop and torque amplification factors of transition process are calculated and compared. All these research results are significant to structure design, parameter optimization and vibration control for the mill drive system.