NASA NTRS · 19910018599
Sound attenuation apparatus
Abstract
An apparatus is disclosed for reducing acoustic transmission from mechanical or acoustic sources by means of a double wall partition, within which an acoustic pressure field is generated by at least one secondary acoustic source. The secondary acoustic source is advantageously placed within the partition, around its edges, or it may be an integral part of a wall of the partition.
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Shepherd, Kevin P., Grosveld, Ferdinand M. W. A.. 1991-06-18. Sound attenuation apparatus. https://ntrs.nasa.gov/citations/19910018599
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