Comparison of Sea and PFFEA Predictions of Radiated Noise from a Stiffened Box Structure

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Authors
  1. Gilroy, L.E.
  2. Smith, M.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Power Flow Finite Element Analysis (PFFEA) [1-7] has been under development in the Structural Acoustics and Strength Group of the Defence Research Establishment Atlantic (DREA) to provide DND with the expertise and tools necessary to solve current structures-related noise problems on CF vessels and to develop future reductions in underwater acoustic signatures. PFFEA (also known as the Power Flow Finite Element Method, PFFEM) is an analysis method for predicting high frequency structural acoustic and vibration response. PFFEM is based on a vibrational conductivity approach in which the flow of vibrational energy is modelled in a similar fashion to heat conduction with convective losses. Statistical Energy Analysis (SEA) [8-9] is a more mature method for the examination of high frequency structural vibrations and radiated noise. SEA is a method based on energy balance between substructures and has been used to evaluate structure-borne sound transmission in a variety of structures including ship structure components or scale models of ships. DREA has recently performed investigations to both validate the PFFEA software produced in-house and to compare it against commercially available SEA software, in particular, SEAM [10], a product from Cambridge Collaborative, Inc.
Keywords
Power Flow Finite Element Analysis (PFFEA)
Report Number
DREA-SL-1999-147 — Paper
Date of publication
01 Dec 1999
Number of Pages
11
DSTKIM No
CA001265
CANDIS No
513105
Format(s):
Hardcopy;Document Image stored on Optical Disk

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