Aerodynamic Noise And The Estimation Of Noise In Aircraft

Item

Title
Aerodynamic Noise And The Estimation Of Noise In Aircraft
Date
1952
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
WADC TR 52-341
Creator
Rogers, Orville R.
Cook, Robert F.
Corporate Author
Aircraft Laboratory
Laboratory
Aircraft Laboratory
Extent
44
PB Number
PB135909
NTRL Accession Number
AD013026
Identifier
AD0013026
AD Number
13026
Access Rights
Notice(s)
Distribution Classification
1
Contract
None Given
DoD Project
None Given
DoD Task
None Given
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
AFAL LTR
Distribution Change Action Date
8/20/2001
Distribution Conflict
Fix
Abstract
Aircraft noise in the frequency range above 600 cps which produces the greatest interference with speech communication, can be controlled by practical amounts of sound insulation and can be estimated from the indicated airspeed in most jet propelled or multi-engine propeller driven aircraft. Since interference with speech communication is the most serious effect of aircraft noise, the methods contained in this report for estimation of the insulation required enable the aircraft designers to provide for necessary sound insulation in the earliest design stages. The principal source responsible for noise above 600 cps in the aforementioned aircraft types is the airflow over the fuselage and this noise is found to depend approximately upon the 2.75 power of the indicated air speed. Sound reduction afforded by the insulation is also found to be simply related to the surface density of the batting plus that of any non-porous septa included in the blanket.
Report Availability
Full text available
Date Issued
1952-02
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
WADCTR52-341.pdf

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