Active control of broadband structural vibration using the adaptive LMS algorithm.

Adaptive feedforward control algorithms have been successfully implemented to attenuate structural vibration and its sound radiation when subjected to single and multiple sinusoidal excitations. Reduction of broadband noise in ducts and enclosures using both finite and infinite impulse response adaptive filters has been reported in the literature. However, feedforward control of structural response under broadband excitation has not been experimentally demonstrated. Here, an adaptive feedforward controller based on the filtered‐x LMS algorithm has been developed for the active control of broadband vibration in structures. The control signal is obtained by filtering the reference signal through an adaptive finite impulse filter (FIR). The filtered‐x LMS algorithm requires an estimate of the transfer function between the control input and the error output. This transfer function is represented by an infinite impulse response (IIR) filter. Two control configurations are then experimentally investigated on a ...