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- W2326350003 abstract "Substructuring methods have been widely used in structural dynamics to divide large, complicated finite element models into smaller substructures. For linear systems, many methods have been developed to reduce the subcomponents down to a low order set of equations using a special set of component modes, and these are then assembled to approximate the dynamics of a large scale model. In this paper, a substructuring approach is developed for coupling geometrically nonlinear structures, where each subcomponent is drastically reduced to a low order set of nonlinear equations using a truncated set of fixedinterface and characteristic constraint modes. A non-intrusive method to fit the nonlinear reduced order model (NLROM) is used to identify the low order equations directly from a finite element model built within a commercial software package. The NLROMs are then assembled to approximate the nonlinear differential equations of the global assembly. The method is demonstrated on the coupling of two geometrically nonlinear plates with simple supports at all edges. The plates are joined at a continuous interface through the rotational degrees-of-freedom (DOF), and the nonlinear normal modes (NNMs) of the assembled equations are computed to validate the equations. The proposed substructuring approach reduces a 12,861 DOF nonlinear finite element model down to only 22 DOF, while maintaining the accuracy to compute the first three NNMs of the full order model." @default.
- W2326350003 created "2016-06-24" @default.
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- W2326350003 date "2014-01-10" @default.
- W2326350003 modified "2023-09-26" @default.
- W2326350003 title "Substructuring with Nonlinear Reduced Order Models and Interface Reduction with Characteristic Constraint Modes" @default.
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- W2326350003 doi "https://doi.org/10.2514/6.2014-1518" @default.
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