B-spline laminate shell finite element updating by means of FRF measurements

A B-spline based FE model updating procedure is proposed. The approach is based on the least squares minimization of an objective function dealing with residues, defined as the difference between the model based response and the experimental measured response, at the same frequency. The B-spline FE model can make it possible to limit the number of dofs. A constraint model and a damping model are proposed, being parameterized by means of B-spline functions. The incompatibility between the measurement dofs and the model dofs is also taken into consideration. An example dealing with a composite car front spoiler is reported, considering the presence of random noise. Results are critically discussed.