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Substructure Model Updating Through Modal Dynamic Residual Approach

D. ZHU, X. DONG, Y. WANG

Abstract


Difference usually occurs between predictions of a finite element (FE) model and experimental measurements from the actual structure. To achieve more accurate predictions, FE models can be updated based on field measurement data. In the past few decades, numerous FE model updating methods have been developed. Nevertheless, when applied to a large structure, most methods are computationally challenging and expensive, because these methods operate on a complex model for the entire structure. To address this issue, a substructure-based updating method is presented in this paper. The Craig-Bampton theory is adopted to condense the entire structural model into a substructure (currently being analyzed) and a residual structure. Dynamic response of the residual structure is approximated using only a limited number of dominant mode shapes. A modal dynamic residual approach is adopted for updating the substructure model. This substructure model updating procedure (through modal dynamic residual approach) is validated by numerical simulation with a 200 degrees-of-freedom spring-mass model. The performance is compared with an updating procedure based on a conventional modal property difference approach.

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