Acoustical data obtained from helicopters in level flight and during 6 degree approaches are used to obtain the variation of A-weighted sound exposure level and effective perceived noise level with distance. These functions are normalized to a reference airspeed which differs for individual helicopter types. Sound level functions at airspeeds different from the reference airspeed, either higher or lower, are obtained by adding a decibel increment to the reference functions. This increment is obtained by multiplying a constant, different for each helicopter, times the square of the difference between the airspeed of interest and the reference airspeed. These data are provided for the following aircraft: CH-3C, CH-47C, CH-54B, HH-53B/C, OH-6A, TH-55A, UH-1N, UH-13. Maximum A-weighted sound levels and perceived noise levels at a distance of 76 meters (250 feet) are also provided as a function of angle around the aircraft during stationary hover conditions. (Author)
Helicopter Noise Level Functions for Use in Community Noise Analyses
1979
47 pages
Report
Keine Angabe
Englisch
Aircraft , Noise Pollution & Control , Aircraft noise , Helicopters , Noise analyzers , Exposure(General) , Measurement , Level(Quantity) , Takeoff , Landing , Aircraft landings , CH-3C helicopters , CH-47C helicopters , CH-54B helicopters , HH-53B/C helicopters , OH-6A helicopters , TH-55A helicopters , UH-1N helicopters , UH-13 helicopters , Noise pollution
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