Accession Number : AD0456708

Title :   NEARFIELD SOUND PRESSURE ON SQUARE AND RECTANGULAR ARRAYS WITH BEAM STEERING.

Descriptive Note : Research rept.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CT

Personal Author(s) : Chin, Norman T.

Report Date : 13 JAN 1965

Pagination or Media Count : 21

Abstract : In this report, square and rectangular radiators are to be considered as models of arrays of closely packed rectangular tranaansducers. The distribution of the nearfield sound pressure on the surface of an array is shown to be affected by the steering of the main beam of the farfield pattern. The numerical results show that the pressures pile up near the leading edge of the array as the beam is steered to a large angle. Expressions of the nearfield pressure are derived for an infinitely long rectangular strip and a finite, slender, rectangular array with end-fire beam steering across the width and along the longer side, respectively. The numerical data of the pressure on various finite, steered arrays are determined by an electronic computer for steering angles other than the end fire. (Author)

Descriptors :   (*ELECTRONIC SCANNERS, ANTENNAS), MATHEMATICAL MODELS, TRANSDUCERS, PRESSURE, CAVITATION, ACOUSTICS, MATHEMATICAL ANALYSIS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE