ADAPTIVE SUPPRESSION OF VIBRATIONS - A REPETITIVE CONTROL APPROACH

The aim of this paper is to present an adaptive solution to suppressio n of vibrations. Adaptation is appropriate whenever the fundamental fr equency is unknown or drifting, e.g., when the vibration is caused by a rotational machine with unknown rotational speed. The approach prese nted here has its roots in repetitive control based on models of isola ted frequencies rather than the commonly used delay: model. The relati onship between different modeled frequencies is fixed by the model str ucture, and the fundamental frequency is obtained by gradient descent or Newton's method, To show the feasibility of this approach, it was u sed to reduce vibrations on a lever that were caused by a motor with i mbalance in its rotation, As actuator, a standard loudspeaker was used , and the vibration was sensed by an accelerometer.