FOCUS - A Computerized Aid for Making Sound Propagation Forecasts.
Abstract
A computerized aid for use in making predictions of far-field sound propagation in the atmosphere is described. The computer program, which was written for a PDP 11/45 minicomputer, traces acoustic rays through a moving, stratified, vertically-inhomogeneous atmosphere to provide the information needed to predict the locations and intensities of focused and lesser amplified propagated sound generated by high explosive detonations and other sources. It also provides locations of quiet zones. Output from the computer program consists of velocity-of-sound profiles, ray destination histrograms, focus factors, peak-to-peak pressure amplitudes, and ray destinations. The output can be produced in the form of CRT plots, Calcomp plots, and computer printouts. There are many optional outputs and several options on input data that can be selected by the user. The program assumes a point sound source that is surface based and does not consider terrain or earth curvature. Although these assumptions limit the horizontal range and situations under which it can be considered valid, the program should still be useful as an aid in producing forecasts for most surface-based sound sources other than those of unusually high TNT equivalent yields. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1979
- Accession Number
- ADA065168
Entities
People
- J. P. Kahler