Accession Number : AD0646911

Title :   ATTENUATION OF SOUND BY SPHERICAL SHELLS.

Descriptive Note : Final rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR COOLEY ELECTRONICS LAB

Personal Author(s) : Barnett,Norman E.

Report Date : OCT 1966

Pagination or Media Count : 78

Abstract : The study of acoustic attenuation at low frequencies by thin spherical shells was continued beyond the initial analysis by Goodman and Stern (J. Acoust. Soc. Am., 34:338, 1962). Experimental measurements were conducted both in air and in water. Numerical evaluation was extended to include the first-order coefficient. For metallic shells immersed in either air or water, the first-order coefficient is larger than, and exhibits interesting fluctuations at lower frequencies than, the zeroth-order coefficient. As a practical consequence, pure zeroth-order behavior is difficult to observe even in the laboratory and most measurements exhibit the combined effects from several orders. (Author)

Descriptors :   (*SHELLS(STRUCTURAL FORMS), ATTENUATION), (*SOUND, *ATTENUATION), SOUND TRANSMISSION, NUMERICAL ANALYSIS, SPHERES, EXPERIMENTAL DATA

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE