Vibration suppression control for a dies-driving spindle of a form rolling machine: Effects of a model-based control with a rotational speed sensor II

This paper deals with a control technique of eliminating the transient vibration generated in a dies-driving spindle of a form rolling machine. This technique is based on a model-based control with a rotational speed sensor. A rotational speed sensor is installed in a driven gear, namely a bull gear. A control model is composed of a reduced-order mechanical part expressed as a transfer function between the rotational speed of the dies and that of the bull gear. This control model estimates a dies speed after the rotational speed of the bull gear is acted on the transfer function. The difference between the estimated dies speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration generated at the dies. In this paper, the effectiveness of the model-based control in the existence of modeling error in the reduced-order model and the effectiveness of the model-based control integrated into the position control loop are verified by simulations. Simulations show satisfactory control results to reduce the transient vibration.