Accession Number:

AD0749845

Title:

Acoustic Analysis of Aircraft Vortex Characteristics

Descriptive Note:

Final rept. on Task 2

Corporate Author:

XONICS INC VAN NUYS CA

Report Date:

1972-07-01

Pagination or Media Count:

202.0

Abstract:

A program of field measurements at NAFEC and related analysis has been carried out as part of the development of acoustic radar for aircraft vortex turbulence detection. Spectra of acoustic signals scattered from the vortices were found to agree in form with those derived from a model, and yielded velocities that generally agreed with those observed by the NAFEC tower instrumentation. Consistent quantitative measurements of circulation, the quantity most closely related to hazard, were obtained for a number of different aircraft. Confident vortex tracks were obtained for aircraft a DC-6 altitudes up to 1500 ft, with the vortex detected at about 1300 ft and tracked for about a minute until it passed out of the coverage region.

Subject Categories:

  • Aircraft
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE