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Effects of cavity resonances on sound transmission into a thin cylindrical shellIn the context of the transmission of airborne noise into an aircraft fuselage, a mathematical model is presented for the effects of internal cavity resonances on sound transmission into a thin cylindrical shell. The 'noise reduction' of the cylinder is defined and computed, with and without including the effects of internal cavity resonances. As would be expected, the noise reduction in the absence of cavity resonances follows the same qualitative pattern as does transmission loss. Numerical results show that cavity resonances lead to wide fluctuations and a general decrease of noise reduction, especially at cavity resonances. Modest internal absorption is shown to greatly reduce the effect of cavity resonances. The effects of external airflow, internal cabin pressurization, and different acoustical properties inside and outside the cylinder are also included and briefly examined.
Document ID
19780061593
Document Type
Reprint (Version printed in journal)
Authors
Koval, L. R. (Missouri-Rolla, University Rolla, Mo., United States)
Date Acquired
August 9, 2013
Publication Date
July 8, 1978
Publication Information
Publication: Journal of Sound and Vibration
Volume: 59
Subject Category
ACOUSTICS
Funding Number(s)
CONTRACT_GRANT: NSG-1050
Distribution Limits
Public
Copyright
Other