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Shock and Vibration
Volume 2015, Article ID 397364, 13 pages
Research Article

Operational Modal Identification of Time-Varying Structures via a Vector Multistage Recursive Approach in Hybrid Time and Frequency Domain

School of Aerospace Engineering, Beijing Institute of Technology, Zhongguancun South Street 5, Qiushi Building 312, Beijing 100081, China

Received 2 July 2014; Accepted 9 December 2014

Academic Editor: Nuno M. Maia

Copyright © 2015 Si-Da Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Real-time estimation of modal parameters of time-varying structures can conduct an obvious contribution to some specific applications in structural dynamic area, such as health monitoring, damage detection, and vibration control; the recursive algorithm of modal parameter estimation supplies one of fundamentals for acquiring modal parameters in real-time. This paper presents a vector multistage recursive method of modal parameter estimation for time-varying structures in hybrid time and frequency domain, including stages of recursive estimation of time-dependent power spectra, frozen-time modal parameter estimation, recursive modal validation, and continuous-time estimation of modal parameters. An experimental example validates the proposed method finally.