Influence of Sensors and Actuators on the Design of the Modal Control System

The efficiency of the active vibration control of flexible systems is limited by the delay in the feedback loop, which causes instability at higher frequencies. In order to design the transfer functions of the feedback control system, it is necessary to use the frequency response functions of the control object. In the case where these functions cannot be measured experimentally, they can be derived from the model of the object. We consider the object model with and without taking into account the influence of sensors and actuators on its dynamics, and the results demonstrate that if this influence is neglected in the model, the efficiency of the control system can significantly decrease. We consider modal control of bending vibrations of a metal beam using piezoelectric sensors and actuators.