ACOUSTIC RADIATION FROM SUBMERGED ELASTIC STRUCTURES - SOFTWARE VERIFICATION

Authors
  1. Brennan, D.P.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
A study involving comparisons between experimentally measured and numerical predictions of sound pressure levels generated by a submerged ring-stiffened cylinder subjected to a point driven harmonic load is presented. At low frequencies (below the first non-zero natural frequency of the dry structure) the numerical model, generated by the AVAST program, underpredicted the radiated noise levels by several orders of magnitude. This discrepancy was found to be caused by the mobility matrix approach used to model the structural response. At higher frequencies, the results generated by AVAST were closer to experimentally measured values; however, AVAST consistently underpredicted the acoustical response, regardless of whether the driving frequency represented a natural frequency of the submerged structure or not.
Report Number
DREA-CR-94-415;TR-94-04 — Contractor Report
Date of publication
01 Mar 1994
Number of Pages
21
DSTKIM No
94-04489
CANDIS No
144039
Format(s):
Hardcopy;Originator's fiche received by DSIS

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