Method for incorporating boundary conditions into finite element

Details Method for incorporating boundary conditions into finite element Method for incorporating boundary conditions into finite element

1997-05-30

1999-09-21

Teska, Kevin J.

39550027, 39550023, G06F 9455

Patent

active

059565004

ABSTRACT:
A method for conducting finite element analysis of a component which takes into consideration the apparent rigidity of an interface structure. The method generally includes the steps of (a) providing a standard shim bar, (b) physically measuring the natural frequencies of the standard shim bar when mounted to the interface structure in at least two orientations, (c) generating a finite element model having a shim interposed between the component and ground, (d) selecting the characteristics of the shim as a function of the measured natural frequencies of the standard test bar in both the first and second orientations, and (e) once the appropriate characteristics are selected, performing the desired finite element analysis on the finite element model. In one embodiment, the characteristics of the shim can be determined by (a) generating a finite element test bar that is a finite element reduction of the standard test bar, (b) interposing a finite element shim between the finite element test bar and ground, and (c) selecting the characteristics of the shim such that tested characteristics of the finite element test bar correlate with the measured characteristics of the standard test bar.

REFERENCES:
patent: 5163015 (1992-11-01), Yokota
patent: 5657588 (1997-08-01), Axon
patent: 5677857 (1997-10-01), Hayashi et al.
Shock and Vibration Handbook,ISBN 0-07-026920-3, Harris (Editor), Pyroshock Testing, Chapter 26, Part II, pp. 26.27-26.32, 1996.
"Algor Software Enables Engineers to Re-design Pipe Shoes," published in "Algor Design World," http://algor.com/adw/july96/pipeshoe.htm, Jul. 1996.

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