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http://dx.doi.org/10.12989/sem.2010.36.6.697

Mode-by-mode evaluation of structural systems using a bandpass-HHT filtering approach  

Lin, Jeng-Wen (Department of Civil Engineering, Feng Chia University)
Publication Information
Structural Engineering and Mechanics / v.36, no.6, 2010 , pp. 697-714 More about this Journal
Abstract
This paper presents an improved version of the Hilbert-Huang transform (HHT) for the modal evaluation of structural systems or signals. In this improved HHT, a well-designed bandpass filter is used as preprocessing to separate and determine each mode of the signal for solving the inherent modemixing problem in HHT (i.e., empirical mode decomposition, EMD, associated with the Hilbert transform). A screening process is then applied to remove undesired intrinsic mode functions (IMFs) derived from the EMD of the signal's mode. A "best" IMF is selected in each screening process that utilizes the orthogonalization coefficient between the signal's mode and its IMFs. Through mode-by-mode signal filtering, parameters such as the modal frequency can be evaluated accurately when compared to the theoretical value. Time history of the identified modal frequency is available. Numerical results prove the efficiency of the proposed approach, showing relative errors 1.40%, 2.06%, and 1.46%, respectively, for the test cases of a benchmark structure in the lab, a simulated time-varying structural system, and of a linear superimposed cosine waves.
Keywords
bandpass filter; Hilbert-Huang transform; modal frequency; orthogonalization coefficient; signal filtering;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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