The New Poly-reference Complex Frequency Formulated in Modal Model (pCF-MM): A New Trend in Experimental Modal Analysis

In Experimental and Operational Modal Analysis (EMA and OMA), the main challenge is to extract the experimental modal properties of the tested structures from the vibration measurements in a very accurate and robust manner. The EMA and OMA can be carried out in time or frequency domain by fitting a parametric model to time or frequency domain measurements, so that the modal properties can be subsequently extracted for the obtained normal matrices. In this chapter, a novel poly-reference modal identification technique formulated in the frequency domain is proposed. The advantage of the proposed approach with regard to the existing techniques is that it yields numerical (non-physical) modes with negative damping, making it easier to distinguish the physical modes. The accuracy and robustness of such an approach is demonstrated by means of an application example at last part of the chapter.