ENHANCEMENTS OF SOFTWARE FOR PFFEA MODELING AND ANALYSIS OF 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
Enhancements to the software implementation of Power Flow Finite Element Analysis (PFFEA) are described. These enable predictions of the high frequency vibrational response and power transmission in complex models of beams and plates typical of ship construction. Improvements have been made in the conductivity matrices used for modeling junction power transmission, and in the way in which power injected to a structure through an excitaton source is predicted. New capabilities for lumped mechanical elements and plates with fluid-loading have been incorporated into the program, and a numerical post-processor has been developed for interpreting PFFEA results. Application of the new features is demonstrated through examples of a frame model and a ring-stiffened cylinder model. The frame model shows that improvements to injected power predictions can be achieved by using the direct dynamic stiffness method. The cylinder model illustrates power injected to a cylinderical shell through a stiffener. The effects of fluid loading of the cyulindrical shell are also investigated using a flate plate model and it is found that it has a significant effect on the response predictions only at frequencies less than one-tenth of the critical frequency for the plate. Validation of these results through experimental measurements is recommended, and three experiments are described for this purpose. TRUNCATED
Keywords
Power Flow Finite Element Analysis (PFFEA);Power flow;Energy transmission;Fluid-structure interaction;Junction models
Report Number
DREA-CR-97-410;MARTEC-TR-96-40 — Contractor Report
Date of publication
01 Mar 1997
Number of Pages
86
DSTKIM No
98-00955
CANDIS No
507759
Format(s):
Hardcopy;Document Image stored on Optical Disk

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