, Volume 4, Issue 2, pp 295-300

An operational modal analysis method in frequency and spatial domain

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A frequency and spatial domain decomposition method (FSDD) for operational modal analysis (OMA) is presented in this paper, which is an extension of the complex mode indicator function (CMIF) method for experimental modal analysis (EMA). The theoretical background of the FSDD method is clarified. Singular value decomposition is adopted to separate the signal space from the noise space. Finally, an enhanced power spectrum density (PSD) is proposed to obtain more accurate modal parameters by curve fitting in the frequency domain. Moreover, a simulation case and an application case are used to validate this method.

Supported by: China Postdoctoral Science Foundation Under Grant No. 2004035215; Jiangsu Planned Projects for Postdoctoral Research Funds 2004; Aeronautical Science Research Foundation Under Grant No. 04I52065