DYNAMIC STIFFNESS BOUNDARY CONDITIONS DERIVED FROM A FINITE ELEMENT MODEL OF SURROUNDING STRUCTURE

Authors
  1. Stredulinsky, D.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The technical memorandum describes the first stage in the development of a method to determine the dynamic stiffness boundary conditions to simulate the influence of the surrounding structure on the frequency response of an extracted structure subjected to harmonic loading. The method proposed and tested involves determining the mode shapes and natural frequencies of vibration for a finite element model of the surrounding structure with the interface to the extracted structure fixed. The procedure was demonstrated to work well for small finit element models but it was discovered that all possible modes of the surrounding structure had to be used to obtain the proper extracted structure response even at low frequencies. The method, in its present form, is not suitable for large finite element models of surrounding structures and additional work is being undertaken to improve the procedure.
Report Number
DREA-TM-93-208 — Technical Memorandum
Date of publication
01 Sep 1993
Number of Pages
27
DSTKIM No
93-04476
CANDIS No
134594
Format(s):
Hardcopy;Originator's fiche received by DSIS

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