Accession Number:

AD0775095

Title:

A Numerical Study of the Effects of Aircraft Manoeuvers on the Focussing of Sonic Booms,

Descriptive Note:

Corporate Author:

TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s):

Report Date:

1973-07-01

Pagination or Media Count:

119.0

Abstract:

The effects of aircraft maneuvers on the focusing of sonic booms are investigated for a model atmosphere which is piecewise linear in wind and sound speeds, and piecewise constant in wind direction. Ray-tube areas and trajectories are obtained in closed form for a real atmosphere with winds and aircraft in arbitrary maneuvers. A mathematical formalism is developed for identifying the focusing ray in general maneuvers, leading to a direct and accurate determination of the caustic surface ground intercept. The algorithms derived in the analysis complement those of Hayes to form the basis for a computer program for predicting sonic boom properties. There appears to be a ten-fold reduction in computing time as compared with the Hayes-Haefeli program. Modified author abstract

Subject Categories:

  • Aircraft
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE