Time-varying system identification using a newly improved HHT algorithm

C. Bao, Hong Hao, Z.X. Li, Xinqun Zhu

    Research output: Contribution to journalArticlepeer-review

    89 Citations (Scopus)

    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.
    Original languageEnglish
    Pages (from-to)1611-1623
    JournalComputers and Structures
    Volume87
    Issue number23-24
    DOIs
    Publication statusPublished - 2009

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