NDLI: Noise transmission characteristics of damped plexiglas windows

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Noise transmission characteristics of damped plexiglas windows

Content Provider	NASA Technical Reports Server (NTRS)
Author	Brown, Sherilyn A. Gibbs, Gary P. Buehrle, Ralph D. Klos, Jacob
Copyright Year	2002
Description	Most general aviation aircraft utilize single layer plexiglas material for the windshield and side windows. Adding noise control treatments to transparent panels is a challenging problem. In this paper, damped plexiglas windows are evaluated for replacement of conventional windows in general aviation aircraft to reduce the structure-borne and airborne noise transmitted into the interior. In contrast to conventional solid windows, the damped plexiglas window panels are fabricated using two or three layers of plexiglas with transparent viscoelastic damping material sandwiched between the layers. Results from acoustic tests conducted in the NASA Langley Structural Acoustic Loads and Transmission (SALT) facility are used to compare different designs of the damped plexiglas panels with solid windows of the same nominal thickness. Comparisons of the solid and damped plexiglas panels show reductions in the radiated sound power of up to 8 dB at low frequency resonances and as large as 4.5 dB over a 4000 Hz bandwidth. The weight of the viscoelastic treatment was approximately 1% of the panel mass. Preliminary FEM/BEM modeling shows good agreement with experimental results for radiated sound power.
File Size	1721420
Page Count	9
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040085776
Archival Resource Key	ark:/13960/t03z36w2m
Language	English
Publisher Date	2002-01-01
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Panels Acoustic Fatigue Noise Reduction General Aviation Aircraft Control Boards Finite Element Method Fabrication Acoustic Excitation Windshields Aircraft Noise Windows Apertures Polymethyl Methacrylate Transparence Viscoelastic Damping Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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