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Impact of Acoustic Standing Waves on Structural ResponsesFor several decades large reverberant chambers and most recently direct field acoustic testing have been used in the aerospace industry to test larger structures with low surface densities such as solar arrays and reflectors to qualify them and to detect faults in the design and fabrication. It has been reported that in reverberant chamber and direct acoustic testing, standing acoustic modes may strongly couple with the fundamental structural modes of the test hardware (Reference 1). In this paper results from a recent reverberant chamber acoustic test of a composite reflector are discussed. These results provide further convincing evidence of the acoustic standing wave and structural modes coupling phenomenon. The purpose of this paper is to alert test organizations to this phenomenon so that they can account for the potential increase in structural responses and ensure that flight hardware undergoes safe testing. An understanding of the coupling phenomenon may also help minimize the over and/or under testing that could pose un-anticipated structural and flight qualification issues.
Document ID
20160005618
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Kolaini, Ali R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 2, 2016
Publication Date
March 25, 2014
Subject Category
Acoustics
Meeting Information
Meeting: Aerospace Testing Seminar
Location: Los Angeles, CA
Country: United States
Start Date: March 25, 2014
End Date: March 27, 2014
Sponsors: NASA Headquarters
Distribution Limits
Public
Copyright
Other
Keywords
Reverberant acoustic field
acoustic/structural modal coupling
direct acoustic field
vibro-acoustic
speakers

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