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Vector Autoregressive Modal Analysis With Application To Ship Structures

✍ Scribed by C.S. Li; W.J. Ko; H.T. Lin; R.J. Shyu

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
347 KB
Volume
167
Category
Article
ISSN
0022-460X

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✦ Synopsis

A method for extracting modal parameters of vibrating structures by using a vector autoregressive (ARV) time series model has been developed. The mathematical theory of a vector ARMA model, which includes a Green function matrix, a correlation function matrix and a spectral density matrix, is presented. The energy proportion index is a possible indicator for the damage detection. The mode shapes of the system are expressed in terms of transfer functions between measurement points. Finally, vibration data from a vertical cantilever beam, and from a sea trial of a new ship were processed by using the ARV model. The results show that this method can estimate model parameters from very short record lengths.

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