ABSTRACT
Transmissibility based Operational Modal Analysis (TOMA) has drawn increasing attention as an interesting alternative to the traditional outputonly modal identification methods working in frequency domain, due to its robustness to the characteristics of the external excitation. This method, based on equivalence of the transmissibility function and corresponding amplitude ratio of vibration modes at the system poles, was firstly presented by Devriendt, C. & Guillaume, P. (2008, 2009) for extracting modal parameters of the system under various real-operating loading cases. Following this framework, many new modal analysis techniques based on scalar or multivariate transmissibility functions have been proposed more recently (Devriendt, C. et al. 2009, 2010a,b, 2012, 2013, Weijtjens, W. et al. 2014a,b). As pointed out by a previous review with respect to OMA to wind turbines (Tcherniak, D. et al. 2011), TMOA appears very attractive among recently suggested approaches because it is robust to colored excitation spectra.
