In load carrying applications one is mainly interested in the stiffness properties of the structural component. Elastic and shear moduli supplemented with section properties render the stiffness properties of the component. Moduli of isotropic materials are well known and well documented. However, this is not the case for composite materials. The developed procedure belongs to the group of mixed numerical experimental methods. The method makes use of modal data to determine the effective orthotropic material properties of composite beams. Modal reference data is experimentally obtained from the beam at hand. The other modal data set is obtained from a finite element model of the same beam. The orthotropic material properties, also called parameters, in the finite element model are then modified in such a way that both sets of modal data match. If those two sets match, the virtual model has "in a global sense" the same mass and stiffness properties as the real model. A program written in FEMtools is applied to five test cases. Results are discussed.
A method is proposed for updating finite element models of structural dynamics using the results of experimental modal analysis, based on the sensitivities to changes in physical parameters. The method avoids many of the problems of incompatibility and inconsistency between the experimental and analytical modal data sets and enables the user to express confidence in measured data and modelling assumptions, allowing flexible but automated model updating.
With the increasing complexity of the products, engineers face a higher level of uncertainty in both simulation and test. Correlation between numerical and experimental analysis using model updating techniques helps engineers to asses uncertainty. Present research efforts focus to combine finite element analysis and testing in one common framework. Experimental and operational modal analysis and simulation make benefit from common databases. Some applications presented emphasize the advantages of these techniques.
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