Abstract
The control system driving the vibration absorber with the force proportional to the velocity of the primary structure is unstable. This problem can be solved by implementing a target absorber equation that can be obtained by replacing the eigenfrequency of the original absorber equation by arbitrary frequencies of excitation and treating the squared arbitrary frequencies as an operator -d^2/dt^2. In this paper, this idea is applied to the active noise control experiment by considering a control speaker an absorber. The effectiveness of the present control method in controlling plural acoustic modes excited by broadband excitation is demonstrated by experiments.
