Accession Number:

AD0852061

Title:

Underwater Noise Reduction Study.

Descriptive Note:

Interim rept. Mar-Nov 68 on Phase 2,

Corporate Author:

SPERRY RAND CORP GREAT NECK NY SPERRY GYROSCOPE

Personal Author(s):

• Safran, M.
• Schwartz, B.
• Rand, G.

Report Date:

1969-04-01

Pagination or Media Count:

93.0

Abstract:

This report on the study of underwater acoustic noise reduction techniques includes a detailed description of the computer program developed for determining the reflectivity, phase shift, and pressure at oblique incident angles for an n-layered generalized acoustic baffle, comprising random layers of fluid and elastic media. Input-output format, plotting options, symbology, and flow charts of all primary and secondary routines of the computer program are presented together with a review of the mathematical models utilized. The report also includes a comparison of the n-layered generalized baffle computer program predictions with the results of various studies in the field of multi-layered baffle media and ocean bottom sedimentation.

Descriptors:

• *HYDROPHONES
• *SONAR DOMES
• *NOISE
• ACOUSTIC INSULATION
• ATTENUATION
• REDUCTION
• SONAR ARRAYS
• FOCUSING
• SHIELDING
• COMPUTER PROGRAMS
• SUBROUTINES
• MATHEMATICAL MODELS
• UNDERWATER SOUND SIGNALS
• SOUND TRANSMISSION
• OCEAN BOTTOM
• REFLECTIVITY
• PHASE SHIFT CIRCUITS
• ANGLE OF ARRIVAL
• SEDIMENTARY ROCK
• COMPOSITE MATERIALS
• SANDWICH CONSTRUCTION

Subject Categories:

• Electrical and Electronic Equipment
• Computer Programming and Software
• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE