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 any complicated adaptive algorithm.The original compensator has an internal model of a sinusoidal disturbance.When the frequency of disturbance varies, the dynamics of the model must also be altered to be identical to those of disturbance for perfect regulation.In the modified compensator, control input is generated by calculating a convolution integral instead of solving the corresponding state-space equation;exogenous signals synchronized with the actual disturbance are used in the convolution.The performance of the designed controller is experimentally studied.