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USAF Bioenvironmental Noise Data Handbook. Volume 130. A-7 Aircraft in the AF32A-19 and the AF32A-24 Noise Suppressors, Near and Far-Field Noise.
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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The AF32A-19 noise suppressor is made by Koppers Environmental Elements Corporation. The AF32A-24 noise suppressor is made by the E. C. DeYoung Company. Both suppressors provide acoustical suppression for the A-7 aircraft during ground runup operations. This report provides measured and extrapolated data defining the bioacoustic environments produced by this aircraft operating in these suppressors for four engine power configurations. Near-field data are reported for 4 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 19 locations are normalized to standard meteorological conditions and extrapolated from 75-8000 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-75-501 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. Author
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