Updating large structure model by the sensitivity analysis of FRF correlation functions

Finite element (FE) model updating is an important tool to improve the accuracy of an initial FE model so that the predicted dynamic behavior matches as closely as possible that tested during the experiment. Two sets of new frequency response function (FRF) correlation functions, i.e. the amplitude correlation coefficient and the shape correlation coefficient are introduced, and an updating algorithm has been obtained by using the sensitivity of FRF correlation functions with respect to the selected design parameters. The use of physical parameters in model updating is implemented from a large ship model. The results indicate that this technique is feasible for very incomplete experimental FRF data and any updating frequency range, even in the case of measurement noise.