Use of Whole-Field Displacement Measurements for Model Updating of Blades

Non-contacting measurement techniques such as modal holographic interferometry look very promising for finite element (F.E.) model updating or error localization of plate-like structures in the field of structural dynamics. The purpose of this work is to investigate a way to better exploit the high spatial resolution of optical techniques in order to correct FE meshing discretization errors and/or model parameter errors. The key idea developed in this paper is to
calculate successively two error estimators using only measurement data. The experimental field is first used for the detection of singular regions corresponding to high deformation (or stress) gradients. This estimator indicates the regions where a mesh refinement is required. Thus a second estimator is calculated and used for parameter error detection.