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EXPERIMENTAL MODAL ANALYSIS OF LARGE STRUCTURES BY SUBSTRUCTURING

✍ Scribed by M. Karpel; S. Ricci

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
257 KB
Volume
11
Category
Article
ISSN
0888-3270

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✦ Synopsis

An experimental modal coupling method is investigated by applying it to a large structure tested by parts. The method is based on testing different parts of the structure with their interface coordinates loaded with rigid, heavy dummy masses. With these boundary masses, the low frequency modes contain local deformations near the interface and thus can be used to obtain accurate dynamic properties of the assembled structure. The applicability and accuracy of this method are demonstrated by coupling the measured modal properties of two substantially different structural components, both tested with the same boundary mass. The test data is obtained with simple standard excitation and data acquisition means. The resulting modal properties of the assembled structure are shown to be in good agreement with those of a finite element model that was tuned to match the dynamic properties of the individual parts.

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