Accession Number:

ADA048838

Title:

USAF Bioenvironmental Noise Data Handbook: Volume 84. C-9A Aircraft, Near and Far-Field Noise.

Descriptive Note:

Technical rept.,

Corporate Author:

AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1977-04-01

Pagination or Media Count:

107.0

Abstract:

The USAF C-9A is an aircraft that airlifts medical patients and is powered by two JT8D-9A turbofan engines. This report provides measured and extrapolated data defining the bioacoustic environments produced by this aircraft operating on a concrete runup pad for four enginepower conditions. Near-field data are reported for four 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 distances 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

Subject Categories:

  • Stress Physiology
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE