Noise Control For Aircraft Engine Test Cells And Ground Run-Up Suppressors Volume 3:An Engineering Analysis Of Measurement Procedures And Of Design Data

Item

Title
Noise Control For Aircraft Engine Test Cells And Ground Run-Up Suppressors Volume 3:An Engineering Analysis Of Measurement Procedures And Of Design Data
Date
1961
Index Abstract
Coming Soon
Photo Quality
Complete
Report Number
WADC TR 58-202 Volume 3
Creator
Doelling, Norman
Bolt, Richard H.
Corporate Author
Bolt Beranek And Newman Inc.
Laboratory
Biomedical Laboratory
Extent
161
Identifier
AD0404785
Access Rights
ASTIA
Distribution Classification
1
Contract
AF 33(616)-3335
DoD Project
7210
DoD Task
71708
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Date Modified
Scanned by request 2/15/2008 submitted by Higgott-Kane, a division of ATCO Noise Management (Other Industry - International)
Abstract
The physical aspects of noise control in aircraft engine test cells and ground run-up suppressors are reported. The measurement procedures and the noise reduction data that form a technical basis for many of the techniques and ideas presented in the other volumes are analyzed. Er rors arising from the measurement equipment, wide band frequency analysis, random variations of noise level in time and space, the use of arti ficial noise sources, variations in air flow con ditions and different measurement procedures are investigated to obtain an objective measure of the reliability of data obtained from an AF sponsored program of acoustical evaluations of test cells and ground run-up suppressors. Data on impervious barriers and noise control com ponents for air passages are analyzed. The per formance of a single wall barrier can be reliably estimated, but the large noise reductions ex pected from double wall barriers are seldom ob tained because of flanking paths. The perform ance of noise control components for air passages was found to differ significantly from that pre dicted by theory (first order modes, long treat ment).
Report Availability
Full text available
Date Issued
1961-11
Provenance
IIT
Type
report
Format
1 online resource
Media
WADCTR58-202volume03.pdf

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