Accession Number : AD0612762

Title :   THE EFFECTS OF UNEQUAL RADIATION LOADS ON THE UNIDIRECTIONAL PROPERTIES OF A 36-ELEMENT BIPLANAR ARRAY OF ACOUSTIC PROJECTORS.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Blizard,M. A.

Report Date : 03 MAR 1965

Pagination or Media Count : 23

Abstract : A mathematical model was derived of a 36-element, biplanar array of variable-reluctance, two-mass, quasidipole, acoustic projectors. It was assumed that mutual interactions and scattering may be neglected and that all projectors in the same plane have the same acoustic load. Various projector element properties and array properties were computed with the aid of an electronic digital computer as a function of frequency and several combinations of acoustic radiation loading and 'arbitrary' conditions. The model illustrates the alteration of the unidirectional radiation of the array as a consequence of unequal radiation loads on the two planes. The model also indicates a limited improvement in the unidirectional radiation due to the addition of tuning capacitors in series with the individual projectors.

Descriptors :   (*ACOUSTICS, TRANSDUCERS), (*TRANSDUCERS, ACOUSTICS), ACOUSTIC EQUIPMENT, MATHEMATICAL MODELS, SOUND TRANSMISSION, MATHEMATICAL ANALYSIS, DIGITAL COMPUTERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE