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Effect of external pressure environment on the internal noise level due to a source inside a cylindrical tankA small cylindrical tank was used to study the effect on the noise environment within a tank of conditions of atmospheric (sea level) pressure or vacuum environments on the exterior. Experimentally determined absorption coefficients were used to calculate transmission loss, transmissibility coefficients and the sound pressure (noise) level differences in the interior. The noise level differences were also measured directly for the two exterior environments and compared to various analytical approximations with limited agreement. Trend study curves indicated that if the tank transmission loss is above 25 dB, the difference in interior noise level between the vacuum and ambient pressure conditions are less than 2 dB.
Document ID
19840023156
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Clevenson, S. A.
(NASA Langley Research Center Hampton, VA, United States)
Roussos, L. A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1984
Subject Category
Astronautics (General)
Report/Patent Number
NAS 1.15:85814
NASA-TM-85814
Accession Number
84N31226
Funding Number(s)
PROJECT: RTOP 199-20-96-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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