Accession Number : AD0287599

Title :   LOW-FREQUENCY ANECHOIC TANK FOR UNDERWATERSOUND STUDIES

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : WAKAMO,C.L.

Report Date : 31 AUG 1962

Pagination or Media Count : 1

Abstract : The building (in conjunction with laboratory studies of underwater acoustics) of an anechoic tank is described. The walls were made highly absorptive by using a combination of high-density concrete and SAPER T absorber material. Refined absorption was effected by the elimination of all free air-water interfaces and the exclusion of air from the space between the coating and wall structure. The tank has performed effectivelyAT FREQUENCIES AS LOW AS 200 CPS. The particular combination of SAPER T and wall structure was evaluated by measurements of standing wave ratio. Problems of design and maintenance were easily solved, and isolation was provided from structureborne noise. An incidental feature is the tank's ready convertiblity for reverberation studies. (Author)

Descriptors :   *ANECHOIC CHAMBERS, *UNDERWATER SOUND, *WATER TANKS, ACOUSTICS, COATINGS, CONCRETE, LOW FREQUENCY, SOUND, STANDING WAVE RATIOS

Distribution Statement : APPROVED FOR PUBLIC RELEASE