Acoustic Environments Produced by the C-5A Aircraft During Ground Operations.
Abstract
Sound pressure levels produced by the C-5A aircraft during ground runup at idle, taxi, and takeoff power settings were measured at locations 200 meters radially distant from the aircraft. These data were used to compute power spectra, directivity indices, and contours of equal sound pressure level, A-weighted overall sound level, permissible exposure time, speech interference level and perceived noise level (tone-corrected). These contours can be used to estimate these quantities over a maximum range from 125 to 1500 meters from the aircraft during ground operation for standard meteorological conditions. Measurements were also made at more than 40 locations where maintenance and ground crews must typically be located during normal operations. A-weighted and C-weighted overall sound levels and permissible exposure times were determined for personnel at these locations with and without ear protection. Preferred speech interference levels were also determined. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1970
- Accession Number
- AD0716814
Entities
People
- John N. Cole
- Robert G. Powell
Organizations
- Air Force Research Laboratory