A Review on Operational Modal Analysis Researches : Classification of Methods and Applications

Nowadays operational modal analysis has found a good ground in identification of system modal parameters. It has been substituted for traditional modal analysis in many practical and experimental cases. Furthermore implementation of OMA has resulted in the development of modal analysis applications. Although one can find a large number of researches on OMA methods and its different applications, review articles about OMA and its applications are limited. This paper reviews the development of OMA, different methods in OMA with and their key issues and research activities. We will classify researches on OMA up to present and try to address the most important ones. Among hundreds of articles and technical reports used in this study, about 80 papers are addressed. 708 IOMAC'09 – 3 International Operational Modal Analysis Conference few numbers of them have been focused on the review or categorizing the methods. This paper tries to categorize different methods of OMA and shortly reviews history of the development of Natural Excitation Technique (NExT), Stochastic Subspace Identification (SS1), Auto Regression Moving Average (ARMA), Frequency Domain Decomposition (FDD) and, Stochastic Realization. Also related topics such as mode shape normalization, load estimation, and OMA at the presence of harmonic excitation are investigated. Relevant and significant research papers and articles are referenced. 2 OPERATIONAL MODAL ANALYSIS METHODS Among different OMA methods, this section discusses history of the most important ones.

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