Phased treatment noise suppressor for acoustic duct applications

Details Phased treatment noise suppressor for acoustic duct applications Phased treatment noise suppressor for acoustic duct applications

1976-02-17

1978-05-30

Tomsky, Stephen J.

Acoustics

Sound-modifying means

Sound absorbing panels

181212, 181213, 181224, 181252, 181292, F01N 100, E04B 199

Patent

active

040918920

ABSTRACT:
A phased treatment noise suppression panel is provided for use in an exhaust duct. The panel consists of individual sections designed with specific modal attenuation characteristics and located axially within the duct in such a sequential order, with respect to the noise source, as to take maximum advantage of modal redistribution effects on overall noise suppression.

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Application of Duct Lining Technology to Jet Aircraft, A. H. Marsh-The Journal of the Acoustical Society of America, vol. 48(3), 1970, pp. 826-842.
Study of Acoustical Treatment for Jet Engine Nacelles, The Journal of the Acoustical Society of America, by A. H. Marsh, vol. 43-(5), 1963, pp. 1137-1156.

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