Abstract
Some of the questions regarding the use of measured data to improve a finite element model of a structure to make it better able to predict the dynamic behavior of the structure are addressed. The issues discussed include the following: All such models are truly reduced models, the parameters of a reduced model of a linear structure vary with frequency, a linear model of a linear structure has a limited frequency range of applicability, and there are an infinite number of reasonable models that can match measured data. These and other related concepts are discussed and demonstrated. Of course, because there is no unique solution, questions arise as to how to select the best one, and are there different best models for different applications. It is concluded that new paths of research in this important field are necessary.
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