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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 todoi:10.1016/j.pnsc.2008.03.011 fatcat:bjgjv6pwbvdzxo2r3huroe3fcu