Accession Number : ADA324044

Title :   Predicting Radiated Sound from a Submerged Ring-Stiffened Cylinder.

Descriptive Note : Technical memo.,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Personal Author(s) : Gilroy, Latyon E.

PDF Url : ADA324044

Report Date : MAR 1997

Pagination or Media Count : 75

Abstract : Defence Research Establishment Atlantic (DREA) conducted experiments involving the measurement of radiated noise from a submerged ring-stiffened cylinder subjected to a harmonic load. These experiments were performed to provide validation data for structural acoustics computer codes being developed in-house and under contract. These codes are used to predict the vibrations of structures submerged in, or filled with, a dense fluid and also to predict the resulting radiated noise. This suite of codes, comprising the programs VAST, COUPLE, and BEMAP, was used to predict the natural frequencies and radiated noise, on- and off-resonance, from this cylinder. Comparisons are made between the predicted and measured natural frequencies and radiated noise levels and directivity. Overall, the programs were able to accurately predict both the structural resonances and the radiated noise patterns.

Descriptors :   *UNDERWATER ACOUSTICS, *SOUND PRESSURE, *RADIATED NOISE, VIBRATION, FINITE ELEMENT ANALYSIS, SIGNAL TO NOISE RATIO, CANADA, RESONANT FREQUENCY, STRUCTURAL RESPONSE, ACOUSTIC MEASUREMENT, HYDROPHONES, ACOUSTIC DATA, UNDERWATER SOUND, ACOUSTIC RESONANCE, RING STIFFENED CYLINDERS.

Subject Categories : Acoustic Detection and Detectors
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE