Accession Number : AD0702065

Title :   STUDY OF THE WATER-FILLED CYLINDRICAL ACOUSTICAL RESONATOR FOR THE DETERMINATION OF LOW FREQUENCY ATTENUATION IN SEA WATER.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Lilly,David Edmund

Report Date : DEC 1969

Pagination or Media Count : 43

Abstract : A pair of large cylindrical Pyrex vessels were water-filled to various heights and the acoustic damping constants and resonant frequencies determined from 3 to 15 kHz. Evacuation of a chamber surrounding the cylinder and increase of the ratio of water height to vessel radius, h/R, greater than unity are both shown to reduce the relative ambient loss of the resonant system. Although the highest Q (20,800) is much less than attained with spherical vessels, it is believed that with thinner walled vessels the extrapolation method of accounting for the influence of the boundaries will permit laboratory measurement of the low frequency attenuation of sound in sea water. (Author)

Descriptors :   (*SEA WATER, *SOUND TRANSMISSION), UNDERWATER SOUND, ATTENUATION, RESONATORS, CYLINDRICAL BODIES, THESES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE