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FINITE ELEMENT CONNECTIVITIES FROM VIBRATION MEASUREMENTS

✍ Scribed by J.E. MOTTERSHEAD

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
118 KB
Volume
13
Category
Article
ISSN
0888-3270

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✦ Synopsis

This paper addresses the problem of determining unknown physical connectivities for inclusion in a "nite element model by using standard frequency response measurements. In general, neither the topology nor the sti!ness of such connectivities are known. A method is presented based on two systems of equations from "nite elements and vibration measurements. When the equations are constrained so that an assumed connection is undeformed, then the eigenvalues and vect(ors of the two systems will be identical if the remainder of the structure is accurately modelled. A numerical example, in the form of a "nite element truss structure, is used to illustrate the application of the method. It is demonstrated that the approach is tolerant of parameter errors elsewhere in the model.

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