Substructure Stiffness and Mass Updating through Minimization of Modal Dynamic Residuals
Publication: Journal of Engineering Mechanics
Volume 142, Issue 5
Abstract
This research studies a substructure finite element model updating approach that requires vibration data from only part of a large structure (i.e., a substructure). The residual structure is condensed using a limited number of dominant modal coordinates, whereas the substructure model remains at high resolution. To update the condensed model, physical parameters in the substructure and modal parameters of the residual structure are chosen as optimization variables; minimization of modal dynamic residuals from the eigenvalue equations in structural dynamics is chosen as the optimization objective. An iterative linearization procedure is adopted for efficiently solving the optimization problem. The proposed substructure model updating approach is validated with 1D, 2D, and 3D examples.
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Acknowledgments
This research was partially funded by the National Science Foundation (CMMI-1150700 and CMMI-1041607) and the Georgia Department of Transportation (RP12-21). Any opinions, findings, and conclusions expressed in this publication are those of the authors and do not necessarily reflect the view of the sponsors.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 5 • May 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: May 8, 2015
Accepted: Nov 24, 2015
Published online: Jan 14, 2016
Published in print: May 1, 2016
Discussion open until: Jun 14, 2016
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