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Modal Substructuring of Geometrically Nonlinear Plates
Author(s) -
Karamooz Mahdiabadi Morteza,
Buchmann Erhard,
Rixen Daniel Jean
Publication year - 2017
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201710227
Subject(s) - substructure , nonlinear system , modal , structural engineering , finite element method , stiffness , reduction (mathematics) , coupling (piping) , modal analysis , convergence (economics) , component (thermodynamics) , mode coupling , computer science , mathematical analysis , mathematics , materials science , engineering , mechanical engineering , physics , geometry , composite material , quantum mechanics , economics , thermodynamics , economic growth
Abstract This work considers model reduction of geometrically nonlinear finite element (FE) model of a plate structure developed in a commercial FE package. The structure is first divided into smaller substructures. Since there is normally no access to the nonlinear stiffness tensors in FE packages, a non‐intrusive method is used in this paper to reduce the order of each substructure separately. In order to generate the nonlinear reduced order model (NLROM), the reduced substructures are assembled using the coupling procedure of the Component Mode Synthesis (CMS) method. As a linear basis, truncated free and fixed interface modes are used here to check the efficiency of the developed NLROM based on them. A plate structure subjected to large deflections is considered in this study to implement the substructuring method. For the sake of validation, Nonlinear Normal Modes (NNMs) are employed to check the convergence of NLROMs in a broadband frequency range. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)