Accession Number : AD0693319

Title :   A NEW METHOD FOR ACOUSTICAL RADIATION PROBLEMS WITH MIXED BOUNDARY VALUES.

Descriptive Note : Scientific rept.,

Corporate Author : PARKE MATHEMATICAL LABS INC CARLISLE MASS

Personal Author(s) : Butler,John L.

Report Date : SEP 1969

Pagination or Media Count : 35

Abstract : A series expansion method for the solution of acoustical radiation problems with mixed boundary values is presented. In this method a wavefunction expansion is truncated to include only the number of terms equal to the number of specified boundary values. The solution improves as this number increases, and coeffients may be evaluated through a matrix inversion. The particular case of a radiator on a sphere is treated and results are presented which show that the sound beam is more directive if the remaining portion of the sphere is soft. (Author)

Descriptors :   (*UNDERWATER SOUND, BOUNDARY VALUE PROBLEMS), ACOUSTIC IMPEDANCE, TRANSDUCERS, BAFFLES, SPHERES, WAVE FUNCTIONS, NUMERICAL ANALYSIS, SERIES(MATHEMATICS)

Subject Categories : Numerical Mathematics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE