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| A NEW ITERATIVE METHOD FOR MODEL UPDATING AND MODAL EXPANSION |
| Li Weiming; Hong Jiazhen; Zhang Yishuai |
| School of Naval architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240 |
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Abstract Model updating usually uses modal expansion technology for the incompatible of the degrees of freedom between Finite element (FE) model and experimental model. Using dynamic expansion method to expand the test data and then update the FE model, the model updating process does not take account of the error of expanding the test data using the FE model. In order to solve this problem, this paper proposes a new iterative strategy that the model updating method considers the above-mentioned error and eliminates the disadvantageous effect by adding a correction term to the model updating formula. Furthermore, this method has universal significance because it does not limit the model updating method. To illustrate the validity of the proposed method, Cross-model Cross-mode method (CMCM) model updating method is used. Numerical example shows that the new method can greatly improve the convergence velocity of iteration.
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Received: 17 April 2009
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2010, Vol. 29 
