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A NEW METHOD FOR MODEL ORDER SELECTION AND MODAL PARAMETER ESTIMATION IN TIME DOMAIN

✍ Scribed by J. LARDIES; N. LARBI

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
490 KB
Volume
245
Category
Article
ISSN
0022-460X

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✦ Synopsis

This paper mainly deals with the identi"cation of structural modal parameters, from output accelerometers only, using a vector autoregressive moving average (VARMA (p, q)) model method. The problem of determining the order p of the AR part, or equivalently the number of modes in a frequency band, is also examined using a combination of the multivariate minimum description length (MDL) criterion and an overdetermined instrumental variable sequence. The AR coe$cients are then obtained from this instrumental variable sequence. The companion matrix is formed and the modal parameters of the vibrating system deduced. Numerical and experimental results are treated to show the e!ectiveness of this new procedure.

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