Self-sensing Active Vibration Control of a Thin Steel Sheet

Abstract

In the rolling process, steel sheet is supported by rollers and is apt to produce structural vibration. Sometimes the surface finish is damaged by this vibration. To overcome this problem, active vibration control has been proposed. Usually it requires a sensor and an actuator. However, the location of the sensor and the actuator is an important problem in active vibration control, and good sensors are expensive. This paper proposes self-sensing vibration control using a push-pull-type electromagnet. The electromagnet has two types of coils : a bias coil and a control coil. The displacement is estimated by using the mutual inductance change between the bias and the control coils. The estimated signal is linear to the gap displacement which is feedback to the control signal. The proposed method is applied to a simple experimental setup to confirm its capabilities.