USAF Bioenvironmental Noise Data Handbook. Volume 4. MA-1A Power Unit, Gas Turbine Engine (AiResearch)
Abstract
The MA-1A Power Unit is a turbine engine driven source of pneumatic power for starting aircraft jet engines and furnishing heated pneumatic power to other types of pneumatically operated equipment. This report provides measured and extrapolated data defining the bioacoustic environments produced by this unit operating outdoors on a concrete apron at normal rated/loaded conditions. Near-field data are reported for 37 locations in a wide variety of physical and psychoacoustic measures: overall and band sound pressure levels, C-weighted and A-weighted sound levels, preferred speech interference level, perceived noise level, and limiting times for total daily exposure of personnel with and without standard Air Force ear protectors. Far-field data measured at 36 locations are normalized to standard meteorological conditions and extrapolated from 5-800 meters to derive sets of equal-value contours for these same seven acoustic measures as functions of angle and distance from the source. Refer to Volume 1 of this handbook, USAF Bioenvironmental Noise Data Handbook, Vol 1: Organization, Content and Application, AMRL-TR-75-50(1) 1975, for discussion of the objective and design of the handbook, the types of data presented, measurement procedures, instrumentation, data processing, definitions of quantities, symbols, equations, applications, limitations, etc.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA029578
Entities
People
- Henry Mohlman
- John N. Cole
- Nick A. Farinacci
- Robert G. Powell
- Robert T. England
Organizations
- Air Force Research Laboratory