Accession Number : ADA310698

Title :   Comparisons of Numerically Predicted and Experimentally Measured Radiated Noise from a Ring-Stiffened Cylinder.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Gilroy, Layton E.

PDF Url : ADA310698

Report Date : MAY 1996

Pagination or Media Count : 44

Abstract : Defence Research Establishment Atlantic (DREA), with the assistance of Health Canada, conducted an experiment involving the measurement of radiated noise from a ring stiffened cylinder subjected to a harmonic load in an anechoic chamber. This experiment was 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 to also predict the resulting radiated noise. A subset of these codes, comprising the programs VAST 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 :   *RADIATED NOISE, *RING STIFFENED CYLINDERS, VIBRATION, VALIDATION, FINITE ELEMENT ANALYSIS, CANADA, HARMONICS, RESONANT FREQUENCY, CYLINDRICAL BODIES, RESONANCE, ACOUSTIC MEASUREMENT, ANECHOIC CHAMBERS.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE