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SPATIAL TRUNCATION IN MODELS OF NON-LINEAR VIBRATING SYSTEMS

✍ Scribed by D.E. ADAMS; R. ALLEMANG; A.W. PHILLIPS; R.H. WYNN JR

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
251 KB
Volume
237
Category
Article
ISSN
0022-460X

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✦ Synopsis

Vibrating systems usually have an in"nite number of degrees of freedom (d.o.f.). Since a "nite number of measurement d.o.f. can only capture certain deformation patterns, the spatial characteristics of vibrating systems are only partially observed experimentally. This research examines the e!ects of spatial truncation on non-linear system identi"cation. It is demonstrated that truncation produces frequency correlated noise, which cannot be extracted completely with traditional techniques. The goal of this article is to provide insight and practical recommendations for diagnosing and/or compensating for errors due to spatial truncation in multiple-d.o.f systems. The article demonstrates that non-linear dynamic systems should be instrumented with su$cient sensors; model properties should be used in addition to the input}output data; and additional temporal data should be collected to help diagnose errors due to spatial truncation.

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