Accession Number:

AD0893335

Title:

A Guide for Predicting the Aural Detectability of Aircraft

Descriptive Note:

Final technical rept. Jan 1970-Jan 1971

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA

Report Date:

1972-03-01

Pagination or Media Count:

231.0

Abstract:

The concepts which underlie the detection of aircraft by the human ear are described. A scheme is delineated for predicting the range at which a given aircraft will first be heard by an average listener this scheme is also applicable to comparing the aural detectabilities of alternate aircraft configurations and to identifying those components of the noise of a given configuration which bear prime responsibility for the aircrafts detectability. Means are presented for predicting the noise due to all sources likely to be significant for light aircraft, the attenuation of acoustic signals propagating from an aircraft to a listener on the ground, and the ability of a listener to detect an acoustic signal in the presence of background noise. From a diffuse literature of acoustics, engineering mechanics and aeronautical engineering this report gathers knowledge and data on methods of predicting the source intensities, propagation and aural detection os sound radiated by military aircraft of the utility class. This report will be used for the design of quiet aircraft and discloses detailed methods used in evaluating such aircraft from the acoustical standpoint.

Subject Categories:

  • Anatomy and Physiology
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE