TY - GEN
T1 - Damage localization in ambient vibration by constructing proportional flexibility matrix
AU - Duan, Z. D.
AU - Yan, G. R.
AU - Ou, J. P.
AU - Spencer, B. F.
N1 - Funding Information:
Supports from the High-Tech R&D Program of Ministry of Science and Technology of China through project 2001AA602023 are acknowledged.
PY - 2003
Y1 - 2003
N2 - Damage localization approaches based on changes of flexibility constitute an important technique for damage detection. Construction of flexibility matrix with output-only data is still unfathomed, and this makes flexibility-based approaches not applicable in ambient vibration. An algorithm is presented to construct a Proportional Flexibility Matrix (PFM) from a set of arbitrarily-scaled modal shapes and modal frequencies. By scaling and redistributing the mass of real structure, a dummy structure is obtained. The ratios among the modal masses of the real and dummy structures can be deduced, and then the PFM is constructed. PFMs for the pre-damaged and post-damaged structure are employed to do damage localization by the Damage Locating Vector (DLV) method. To make the two flexibilities comparable, a normalization scheme of mass matrix is presented. A numerical example shows that a small number of measured modes can produce PFMs with sufficient accuracy to correctly locate the damage employing the DLV method.
AB - Damage localization approaches based on changes of flexibility constitute an important technique for damage detection. Construction of flexibility matrix with output-only data is still unfathomed, and this makes flexibility-based approaches not applicable in ambient vibration. An algorithm is presented to construct a Proportional Flexibility Matrix (PFM) from a set of arbitrarily-scaled modal shapes and modal frequencies. By scaling and redistributing the mass of real structure, a dummy structure is obtained. The ratios among the modal masses of the real and dummy structures can be deduced, and then the PFM is constructed. PFMs for the pre-damaged and post-damaged structure are employed to do damage localization by the Damage Locating Vector (DLV) method. To make the two flexibilities comparable, a normalization scheme of mass matrix is presented. A numerical example shows that a small number of measured modes can produce PFMs with sufficient accuracy to correctly locate the damage employing the DLV method.
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M3 - Conference contribution
AN - SCOPUS:33947628012
SN - 9058096483
SN - 9789058096487
T3 - Structural Health Monitoring and Intelligent Infrastructure - Proceedings of the 1st International Conference on Structural Health Monitoring and Intelligent Infrastructure
SP - 561
EP - 565
BT - Structural Health Monitoring and Intelligent Infrastructure - Proceedings of the 1st International Conference on Structural Health Monitoring and Intelligent Infrastructure
T2 - 1st International Conference on Structural Health Monitoring and Intelligent Infrastructure, SHMII-1'2003
Y2 - 13 November 2003 through 15 November 2003
ER -