✦ LIBER ✦

IDENTIFICATION OF DAMPING: PART 4, ERROR ANALYSIS

✍ Scribed by S. ADHIKARI; J. WOODHOUSE

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 355 KB
Volume: 251
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.2001.4024

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✦ Synopsis

methods were proposed to obtain the coe$cient matrix for a viscous damping model or a non-viscous damping model with an exponential relaxation function, from measured complex natural frequencies and modes. In all these works, it has been assumed that exact complex natural frequencies and complex modes are known. In reality, this will not be the case. The purpose of this paper is to analyze the sensitivity of the identi"ed damping matrices to measurement errors. By using numerical and analytical studies it is shown that the proposed methods can indeed be expected to give useful results from moderately noisy data provided a correct damping model is selected for "tting. Indications are also given of what level of noise in the measured modal properties is needed to mask the true physical behaviour.

2002 Elsevier Science Ltd.

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