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Interaction of airborne and structureborne noise radiated by plates. Volume 1: Analytical studyThe interaction of airborne and structureborne noise radiated by aircraft materials was examined. The theory and results of several computer simulations of the noise radiated by thin, isotropic, rectangular aluminum plates due to fully coherent combined acoustic and vibrational inputs is presented. The most significant finding was the extremely large influence that the relative phase between inputs has on the combined noise radiation of the plates. Phase dependent effects manifest themselves as cross terms in both the dynamic and acoustic portions of the analysis. Computer simulations show that these cross terms can radically alter the combined sound power radiated by plates constructed of aircraft-type materials. The results suggest that airborne-structureborne interactive effects could be responsible for a significant portion of the overall noise radiated by aircraft-type structures in the low frequency regime. This implies that previous analytical and experimental studies may have neglected an important physical phenomenon in the analayses of the interior noise of propeller dirven aircraft.
Document ID
19860020161
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Mcgary, M. C. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1986
Subject Category
Acoustics
Report/Patent Number
NAS 1.15:87746
NASA-TM-87746
Accession Number
86N29633
Funding Number(s)
PROJECT: RTOP 505-63-11-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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