ACTIVE DYNAMIC VIBRATION ABSORBER WITH AUTOMATIC FREQUENCY-TRACKING PERFORMANCE

A disturbance cancellation controller for the active dynamic vibration absorber is modified to follow the frequency of disturbance without a ny complicated adaptive algorithm. The original compensator has an int ernal model of a sinusoidal disturbance. When the frequency of disturb ance varies, the dynamics of the model must also be altered to be iden tical to those of disturbance for perfect regulation. In the modified compensator, control input is generated by calculating a convolution i ntegral instead of solving the corresponding state-space equation; exo genous signals synchronized with the actual disturbance are used in th e convolution. The performance of the designed controller is experimen tally studied.