Active Vibration Control of Stationary Vibration. Effect of Number and Location of Control Forces.

Recently, active vibration control has been applied to some bridges and buildings. However, the control has only been used to reduce vibration of lower modes. Control methods and spillover problems have also been discussed, but little has been done in terms of analysis of the number and location of actuators. For reduction of the vibration of higher modes, it is necessary to use many actuators. In terms of industrial application, it is important to know the necessary number and optimum location of actuators in order to obtain the required vibration reduction. In this report, we discuss the relationship between the number and location of actuators and vibration reduction for stationary vibration of a simple supported uniform beam. The following results were obtained. First, vibration reduction is strongly affected by the location of the actuators. Second, vibration reduction varies according to the distribution pattern of forces. Based on the findings, an estimation technique for the vibration reduction was proposed.