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    Time-varying system identification using a newly improved HHT algorithm

    Access Status
    Fulltext not available
    Authors
    Bao, C.
    Hao, Hong
    Li, Z.
    Zhu, X.
    Date
    2009
    Type
    Journal Article
    
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    Citation
    Bao, C. and Hao, H. and Li, Z. and Zhu, X. 2009. Time-varying system identification using a newly improved HHT algorithm. Computers and Structures. 87: pp. 1611-1623.
    Source Title
    Computers and Structures
    ISSN
    0045-7949
    URI
    http://hdl.handle.net/20.500.11937/8708
    Collection
    • Curtin Research Publications
    Abstract

    A newly improved Hilbert-Huang transform (HHT) algorithm is presented for identification of time-varying systems and analysis of nonlinear structural response with closely spaced modes. In this improved HHT, the auto-correlation function of the structural response is taken as a substitute of input to reduce noise effect. A band-pass filter scheme and an effective intrinsic mode function (IMF) selection principle are combined to overcome the modal perturbation problem. Based on these, a time-varying system identification procedure is developed. Its robustness and effectiveness are verified by both numerically simulated and laboratory measured vibration data on a scaled concrete-steel composite beam model.

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