Accession Number:

AD0857280

Title:

Acoustic Characteristics of the NOL Hydroballistics Tank,

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

• Leslie, Charles B.

Report Date:

1969-05-19

Pagination or Media Count:

29.0

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