A global approach for scaling the mode shapes estimated by operational modal analysis

This paper describes a new method for estimating the modal mass associated to mode shapes found through operational modal analysis. The knowledge of the modal mass is a key information for estimating the frequency response function of the structure/system under analysis. The newly proposed method is based on the use of mono-harmonic excitation tests at frequency values at (or close to) resonances. The method allows for simpler and cheaper experimental set-ups, compared to the other methods already available in the literature. Furthermore, it does not require any assumption on the structure/system considered. The paper presents the theory behind the method and then validates it by means of experimental tests.