Force Identification Based on Sensitivity in Time Domain
Publication: Journal of Engineering Mechanics
Volume 132, Issue 10
Abstract
A new method is proposed for identifying the time history of the input excitation using the dynamic response of the structure. The sensitivities of dynamic response with respect to the parameters of the input force are calculated in the time domain. These sensitivities are used to update the parameters of the identified force(s) iteratively in the inverse analysis. Both sinusoidal excitation and impulsive force are used in the simulation study. Three numerical examples show that the proposed method is effective and highly accurate in identifying the force(s). Both the effects of measurement noise and modeling error of the structure are found negligible on the accuracy of the identified force in the studies. The proposed method is further verified with laboratory measurements from a steel bar under sinusoidal excitation with very good results.
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Acknowledgment
The work described in this paper was supported by a research grant from the Hong Kong Polytechnic University.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 10 • October 2006
Pages: 1050 - 1056
Copyright
© 2006 ASCE.
History
Received: May 7, 2004
Accepted: Jan 18, 2006
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Raimondo Betti
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