FORCASTING THE FOCUS OF AIR BLASTS DUE TO METEOROLOGICAL CONDITIONS IN THE LOWER ATMOSPHERE
Abstract
WHENEVER EXPLOSIONS ARE USED IN TESTING OR IN EXPERIMENTAL PROCEDURES,THE SOUND WAVES THAT GO BEYOND THE LIMITS OF THE INSTALLATION MAY CAUSE COMPLAINTS OF ANNOYANCE OR DAMAGE FROM OTHERWISE GOOD NEIGHBORS. THIS IS DUE TO FOCUSING OF THE SOUND WAVES CAUSED BY THE METEOROLOGICAL CONDITIONS AT THE TIME OF THE EXPLOSION. THE THEORY OF THE PROPAGATION OF SOUND THROUGH THE ATMOSPHERE IS GIVEN BRIEFLY. THE CONDITIONS IN THE ATMOSPHERE WHICH CAUSE THE SOUND TO BE FOCUSED ARE VELOCITY GRADIENTS PRODUCES BY VARIATIONS WITH ALTITUDE OF HUMITY, AIR TEMPERATURE, AND WIND VELOCITY. A SIMPLE METHOD IS DESCRIBED FOR EVALUATING THESE FACTORS AND FORECASTING THE LOCATION OF A FOCUS, IF ONE IS TO BE EXPECTED, AS WELL AS THE INTENSITY OF THE SOUND AT THE FOCUS.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1960
- Accession Number
- AD0250146
Entities
People
- Beauregard Perkins Jr.
- Paul H. Lorrain
- William H. Townsend
Organizations
- Ballistic Research Laboratory