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Determination of Modal Parameters from Ambient Vibration Data for Structural Health Monitoring

Beck, J. L. and May, B. S. and Polidori, D. C. (1994) Determination of Modal Parameters from Ambient Vibration Data for Structural Health Monitoring. In: Proceedings First World Conference on Structural Control. International Association for Structural Control , Los Angeles, CA, TA3-3-TA3-12. ISBN 0962890839.

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A computationally efficient methodology is presented for· determination of the modal parameters of a structure from its measured ambient vibrations at several instrumented locations. The method, which is an extension of a well established and very efficient algorithm, MODE-ID constitutes the first step of a proposed two-step methodology for continuously monitoring the health of a structure by utilizing its natural ambient vibrations. During this first step, changes in the values of the modal parameters identified. The second step involves the determination of the corresponding loss of stiffness within the structure. The advantage in performing the two steps separately is that the computationally intensive second step need only be performed when the identified changes in modal parameters exceed certain thresholds indicating that structural damage is likely to have occurred. Results of testing the proposed methodology on simulated data and from an ambient vibration survey of Caltech's Millikan Library are presented.

Item Type:Book Section
Additional Information:The authors wish to thank Professors M. D. Trifunac and M. Todorovska and their students A. Gladkov, E. Novikova, and J. Qin from the University of Southern California. for their initiative, equipment and cooperation in performing the Millikan Library ambient vibration survey.
Record Number:CaltechAUTHORS:20120926-104201205
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34438
Deposited By: Carmen Nemer-Sirois
Deposited On:15 Oct 2012 20:29
Last Modified:03 Oct 2019 04:19

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