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A broadband passive–active sound absorption system
1999
Journal of the Acoustical Society of America
In recent years, hybrid absorption systems have been implemented which achieve high sound absorption over a broad frequency range. This work is an experimental study of a broadband hybrid absorption system which is comprised of a layer of sound-absorbing material ͑the passive component͒ positioned at a distance from a movable wall ͑the active component͒ inside an impedance tube. The movable wall is used to impose desired boundary conditions in the cavity behind the passive layer, thereby
doi:10.1121/1.428094
fatcat:vznfz4qgvzhw7a4cp7ht2qi544