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Effect of air flow, panel curvature, and internal pressurization on field-incidence transmission lossIn the context of sound transmission through aircraft fuselage panels, equations for the field-incidence transmission loss (TL) of a single-walled panel are derived that include the effects of external air flow, panel curvature, and internal fuselage pressurization. Flow is shown to provide a modest increase in TL that is uniform with frequency up to the critical frequency. The increase is about 2 dB at Mach number M = 0.5, and about 3.5 dB at M = 1. Above the critical frequency where TL is damping controlled, the increase can be slightly larger at certain frequencies. Curvature is found to stiffen the panel, thereby increasing the TL at low frequencies, but also to introduce a dip at the 'ring frequency' of a full cylinder having the same radius as the panel. Pressurization appears to produce a slight decrease in TL throughout the frequency range, and also slightly shifts the dips at the critical frequency and at the ring frequency.
Document ID
19760055521
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Koval, L. R. (Missouri, University Rolla, Mo., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Publication Information
Publication: Acoustical Society of America
Subject Category
ACOUSTICS
Funding Number(s)
CONTRACT_GRANT: NSG-1050
Distribution Limits
Public
Copyright
Other