The Army needs helicopter noise source emission data for use in the Installation Compatible Use Zone (ICUZ) program and for environmental assessments. This research gathered noise source emission data for the OH-58D helicopter. The data were normalized to 250 ft for use in noise maps. The data were also used to develop sound exposure level (SEL) versus distance curves for comparison with other helicopter data. The data show that the A-weighted maximum noise level increases with airspeed for level flight, but the A weighted SEL increases only slightly. The highest A-weighted maximum level was produced by the out-of-ground effect hover. Landings produce the largest A-weighted SEL.
Operational Noise Data for OH-58D Army Helicopters
1992
57 pages
Report
No indication
English
Representative Engine Power Data for Army Helicopters
NTIS | 1976
|User testing of helicopters by army
Engineering Index Backfile | 1957
|