Active Adaptive Feedback Control of Sound Field

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Abstract
A new active adaptive feedback control algorithm (F. B. LMS) was developed in this paper mainly for the purpose of reducing aerodynamically self-oscillating noises. This is an algorithm which reconstructs the Filtered-X-LMS to a feedback type and which needs only error signals. A simple experiment using a straight duct proved that this method could increase acoustic damping in a closed sound field by controlling the secondary source just like a sound-absorbing wall. This method was also proven to be effective for reducing periodic noises which had periodic causality. This method was applied to reduce a cavity tone and a resonant noise of a model tube bundle which were typical self-oscillating noises, and satisfactory results were obtained. It was also successfully applied to reduce periodic noises such as those in a cab of a construction machine radiating from engine, cooling fan and oil hydraulic pump.

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