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An operational modal analysis method in frequency and spatial domain

Wang Tong (王彤)1, Zhang Lingmi (张令弥)1 and Tamura Yukio (田村幸雄)2

1. Institute of Vibration Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. Department of Architectural Engineering, Tokyo Institute of Polytechnics, Japan

Abstract:  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.

Keywords: operational modal analysis; modal parameters identification; frequency and spatial domain