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Impact of Acoustic Standing Waves on Structural Responses: Reverberant Acoustic Testing (RAT) vs. Direct Field Acoustic Testing (DFAT)Loudspeakers have been used for acoustic qualification of spacecraft, reflectors, solar panels, and other acoustically responsive structures for more than a decade. Limited measurements from some of the recent speaker tests used to qualify flight hardware have indicated significant spatial variation of the acoustic field within the test volume. Also structural responses have been reported to differ when similar tests were performed using reverberant chambers. To address the impact of non-uniform acoustic field on structural responses, a series of acoustic tests were performed using a flat panel and a 3-ft cylinder exposed to the field controlled by speakers and repeated in a reverberant chamber. The speaker testing was performed using multi-input-single-output (MISO) and multi-input-multi-output (MIMO) control schemes with and without the test articles. In this paper the spatial variation of the acoustic field due to acoustic standing waves and their impacts on the structural responses in RAT and DFAT (both using MISO and MIMO controls for DFAT) are discussed in some detail.
Document ID
20150004585
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)
Doty, Benjamin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chang, Zensheu
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
April 8, 2015
Publication Date
October 16, 2012
Subject Category
Acoustics
Meeting Information
Meeting: Aerospace Testing Seminar
Location: Los Angeles, CA
Country: United States
Start Date: October 16, 2012
End Date: October 18, 2012
Sponsors: Institute of Environmental Sciences and Technology, Aerospace Corp.
Distribution Limits
Public
Copyright
Other
Keywords
speakers
direct acoustic field
acoustic/structural modal coupling
reverberant acoustic field
vibro-acoustic

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