Accession Number : AD0857280

Title :   Acoustic Characteristics of the NOL Hydroballistics Tank,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Leslie, Charles B.

Report Date : 19 MAY 1969

Pagination or Media Count : 29

Abstract : Acoustic measurements were made in the NOL Hydroballistics Tank to determine its acoustic characteristics. These showed that the ambient noise level is very high, due primarily to the filter circulating pumps. Reflection coefficients for the walls vary slightly with position, method, and frequency but mostly lie in the range from 0.8 to 0.9. The reverberation time for the tank was about 0.3 second. Possible remedial measures are discussed briefly. (Author)

Descriptors :   (*UNDERWATER BALLISTICS, TEST FACILITIES), (*WATER TANKS, ACOUSTIC PROPERTIES), NOISE, BACKGROUND, REVERBERATION, SOUND TRANSMISSION, REFLECTION, UNDERWATER SOUND, HYDROPHONES, UNDERWATER SOUND GENERATORS.

Subject Categories : Test Facilities, Equipment and Methods
      Ballistics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE