Abstract
This work reports findings from a case study which is aimed at updating a medium-size finite element model using frequency response function (FRF) data. The numerical stability of the method and its applicability to true measured FRF data were investigated in the case of a plate-beam structure which was modeled using about 500 dof. The initial finite element model of the structure was found to be in fairly good agreement with measured data, a feature which allowed a systematic evaluation of various factors affecting the quality of model updating. After several attempts, it was possible to update the initial FRFs so that they matched the measured ones within engineering accuracy. However, the non-uniqueness of the updated model became apparent since it was possible to find several such models, the FRFs of each of which satisfied the basic matching criterion.
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