ADVANCED MODELLING CAPABILITIES FOR POWER FLOW FINITE ELEMENT ANALYSIS (PFFEA)

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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
General formulas for structural input power and fluid modeling are developed for application to the Power Flow Finite Element Analysis (PFFEA) method. Broadband input power to beam structures is derived from a stiffness matrix formulation for an arbitrary beam junction, and it is shown to be consistent with other analytical and numerical results. For plate and beam-plate junctions, an input power model is derived for a general line junction configuration in which distributed excitations can be applied along the axis of the junction. Expressions for the total power and the power flow into individual plate components are derived in terms of Fourier transforms of the velocities, forces and moments. Both the beam junction and line junction input power models are recommended for implementation, although some additional validation of the line junction model may be required. Energy and power flow expressions for the high frequency acoustic response of a fluid medium are derived. For enclosed bodies of fluid, the governing equations are similar to the conductivity-type equations for structural components. For the problem of radiation to an infinite fluid, a hybrid energy and power flow method is developed in which directly generated and reverberantly generated components of the radiated fields are estimated separately. TRUNCATED
Keywords
Power Flow Finite Element Analysis (PFFEA);Power flow;Energy transmission;Fluid-structure interaction;Junction models;Laser doppler velocimeter
Report Number
DREA-CR-97-447;MARTEC-TR-97-07 — Contractor Report
Date of publication
01 Mar 1997
Number of Pages
120
DSTKIM No
98-01269
CANDIS No
508056
Format(s):
Hardcopy;Document Image stored on Optical Disk

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