Recursive Hilbert-Huang Transform Method for Time-Varying Property Identification of Linear Shear-Type Buildings under Base Excitations
Publication: Journal of Engineering Mechanics
Volume 138, Issue 6
Abstract
This paper presents a recursive Hilbert-Huang transform method for the time-varying property identification of shear-type buildings under base excitations. To overcome nonorthogonality and modal perturbation issues, all significant intrinsic mode functions of each signal and their Hilbert transforms were summed to track any variation of structural parameters of a multistory building over time. Given floor masses, both the stiffness and damping coefficients of the building were identified one by one from the top to bottom story. The overall accuracy of the identified parameters was measured by an index of accuracy based on the weighted root-mean-squared evaluation proposed in this study. One- and two-story shear buildings with abruptly, gradually, and periodically varying parameters were used as examples. The numerical results indicated that the proposed method is efficient, robust, and accurate in tracking variations of the properties of multistory buildings. Finally, the proposed method was applied into the identification of the time-varying natural frequency of a real-world high-voltage switch structure due to the friction mechanism used in the switch. The range of the identified frequency by the proposed method was in good agreement with that attained by the conventional least-squares method.
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Acknowledgments
Financial support to complete this study was provided in part by the China Scholarship Council, Award No. NSCIS-[2007]3020 and by Ameren Corporation, St. Louis, MO. Thanks are due to Seth McConnell for his effort to coordinate the shake table tests of high-voltage switches.
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© 2012. American Society of Civil Engineers.
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Received: Sep 27, 2010
Accepted: Nov 21, 2011
Published online: Nov 23, 2011
Published in print: Jun 1, 2012
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