Optimization Method for Educing Variable-Impedance Liner Properties

A new approach to educing normal incidence acoustic impedance of nonuniform testspecimens in grazing incidence and grazing-flow environments is described. An optimization algorithm is shown to provide an efficient means for searching out an impedance distribution to match the measured acoustic field...

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Bibliographic Details
Published in:AIAA journal 1998-01, Vol.36 (1), p.18-23
Main Authors: Watson, Willie R, Tanner, Sharon E, Parrott, Tony L
Format: Article
Language:English
Subjects:
Acoustical measurements and instrumentation
Acoustics
Aerodynamics
Aircraft
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
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Summary:A new approach to educing normal incidence acoustic impedance of nonuniform testspecimens in grazing incidence and grazing-flow environments is described. An optimization algorithm is shown to provide an efficient means for searching out an impedance distribution to match the measured acoustic field along the upper wall of a duct opposite the test specimen. The flow duct is allowed to transmit multimodal, nonprogressive acoustic waves in a flow environment; however, only ano-flow environment is discussed.
ISSN:0001-1452
1533-385X
DOI:10.2514/2.369