Refinement of reduced-models for dynamic systems |
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Authors: | Huajun Li Min Zhang Sau-Lon James Hu |
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Institution: | 1. Department of Ocean Engineering, Ocean University of China, Qingdao 266100, China 2. Department of Ocean Engineering, University of Rhode Island, Narragansett, RI 02882-1197, USA |
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Abstract: | A refinement procedure for the reduced models of structural dynamic systems is presented in this article. The refinement procedure is to "tune" the parameters of a reduced model, which could be obtained from any traditional model reduction scheme, into an improved reduced model. Upon the completion of the refinement, the improved reduced model matches the dynamic characteristics - the chosen structural frequencies and their mode shapes - of the full order model. Mathematically, the procedure to implement the model refinement technique is an application of the recently developed cross-model cross-mode (CMCM) method for model updating. A numerical example of reducing a 5-DOF (degree-of-freedom) classical mass-spring (or shear-building) model into a 3-DOF generalized mass-spring model is demonstrated in this article. |
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Keywords: | Model reduction Model refinement Finite element method Modal analysis Structural dynamics |
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