FULL FIELD OPTICAL MEASUREMENTSOPERATIONAL MODAL ANALYSIS AND MODEL UPDATING

Full field measurements, with their high accuracy in spatial definition of displace- ment patterns, are gaining increasing interest within the engineering community. Whereas in general the full field measurements can be more aimed at laboratory testing like traditional Experimental Modal Analysis (EMA), due to their complex equipment and the relation with the excitation sources, low cost image based & output only approaches like Hi-Speed Digital Image Correlation (DIC) can be challenged also in Operational Modal Analysis (OMA) framework. This work would then like to show Hi-Speed DIC usefulness also in the OMA procedures and consequent Model Updating (MU) technologies. In particular, the impact of many measurement points, or channels, is shown on the experimental identification of a vibrating plate and later on the numerical model refinement of the restraining conditions, with comments and details.