Implementation of model updating methods in a general finite element program and testing on problems of industrial size require the selection of robust and cheap algorithms. Model updating techniques can be classified into two groups: global and local methods. Global methods, which are based on the correction of the global stiffness and mass matrices of the FE model, are recognized as physically meaningless. Local updating techniques can be classified as modal parameter or FRF based methods. The iterative/FRF based methods will be examined, because they allow the engineer to avoid the modal analysis effort and understand which are the wrong physical parameters in the original FE model. Two well established methods [1], [2] are presented and applied to the test case of a space frame structure. A frequency domain correlation technique is presented, that allows a judicious selection of updating frequencies and a estimation of the global closeness between FE and tests in terms of dynamic responses.
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