Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 25, Issue 8, Pages 2923-2937Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2011.05.013
Keywords
Recursive subspace identification; Forgetting factor; LQ-factorization; Matrix operation
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Funding
- National Science Council, Taiwan [NSC 95-2625-Z-002-032, NSC 94-2915-I-492-C08]
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The objective of this paper is to develop an on-line tracking of system parameter estimation and damage detection techniques using response measurements. To avoid the singular-value-decomposition in data Hankel matrix, a new subspace identification algorithm was developed. Seismic response data of a 3-story steel frame with abrupt change of inter-story stiffness from the shaking table test was used to verify the proposed recursive subspace identification (RSI) method by using both input and output measurements. With the implementation of forgetting factor in RSI method the ability of on-line damage detection of the abrupt change of structural stiffness can be enhanced. Then, the recursive stochastic subspace identification (RSSI) algorithm is also developed for continuous structural health monitor of structure by using the output-only measurements. Verification of the proposed RSSI method by using the white noise response data of a 2-story reinforced concrete frame from its low level white noise excitation was used. Discussion of the subspace identification model parameters is also investigated. (C) 2011 Elsevier Ltd. All rights reserved.
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