Techno Press

Structural Engineering and Mechanics   Volume 17, Number 3, March 2004, pages 445-466
Comparative study on modal identification methods using output-only information
Jin-Hak Yi and Chung-Bang Yun

Abstract     [Full Text]
    In this paper, several modal identification techniques for output-only structural systems are extensively investigated. The methods considered are the power spectral method, the frequency domain decomposition method, the Ibrahim time domain method, the eigensystem realization algorithm, and the stochastic subspace identification method. Generally, the power spectral method is most widely used in practical area, however, the other methods may give better estimates particularly for the cases with closed modes and/or with large measurement noise. Example analyses were carried out on typical structural systems under three different loading cases, and the identification performances were examined throught the comparisons between the estimates by various methods.
Key Words
    modal identification; output-only information; power spectral method; frequency domain decomposition; Ibrahim time domain; eigensystem realization algorithm; stochastic subspace identification.
Jin-Hak Yi; Smart Infra-Structure Technology Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
Chung-Bang Yun; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

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