EXTENSION OF POWER FLOW FINITE ELEMENT ANALYSIS TO SHIP STRUCTURES

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Authors
  1. Smith, M.J.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
The Power Flow Finite Element Analysis (PFFEA) method uses a heat-conduction analogy for vibrational energy flow in the high frequency vibratory response prediction of structural elements and systems. The application of PFFEA to general structural models is studied in this report, with the advances documented in several aspects of vibrational energy modelling. An energy transmission model for three-dimensional beam juntions is described and results are presented both with and without shear deformation and rotary inertia in the formulation. It is found that these effects can be significant at frequencies far below those normally encountered with shear mode propagation. Also, the implementation of general plate and reinforced plate junction models based on the work of Langley and Heron (16) is discussed. In this model, thin plate theory used for the participating plates and shear deformation, rotary inertia and non-coincident centroid, shear centre, and plate connection points are included in the representation of the reinforcing beam. Several examples validating the approach are given, and it is found that the influence of offset connection points can be more significant than shear deformation. A methodology for determining the energy transmission characteristics through a complex junction of plates is described and is then applied to a corner junction of three plates. TRUNCATED
Keywords
Junction models;Power flow;Fluid-structure interaction;Power Flow Finite Element Analysis (PFFEA);Energy transmission
Report Number
DREA-CR-96-406;MARTEC-TR-95-31 — Contractor Report
Date of publication
01 Feb 1996
Number of Pages
147
DSTKIM No
96-02067
CANDIS No
498677
Format(s):
Document Image stored on Optical Disk;Hardcopy

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