Model updating using a structural model is based on the analysis of the discrepancies between analytical and experimental results. In order to compare these quantities, a matching process is necessary. The updating procedure can be based on mode shapes or on operating deflection shapes. The operating deflection shapes correspond to the deformations that the structure suffers when it is excited with an harmonic force. The direct use of operating deflection shapes for model updating is interesting since they contain information on all the excited mode shapes. Moreover, their reliability can be evaluated by the coherence function. Thus the errors associated to modal identification are avoided. The local error indicator considered in this paper is an extension of a technique already used with expanded mode shapes. Physical insight is straightforward since the error measure corresponds to a local strain energy. Then, model correction can be performed by minimizing energy residuals.
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