Non-intrusive reduced order modelling for the dynamics of geometrically nonlinear flat structures using three-dimensional finite elements
Type
Articles dans des revues avec comité de lectureAuthor

12568 Laboratoire de Mécanique des Structures et des Systèmes Couplés [LMSSC]
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]

421305 Institut des Sciences de la mécanique et Applications industrielles [IMSIA - UMR 9219]
Date
2020Journal
Computational MechanicsAbstract
Non-intrusive methods have been used since two decades to derive reduced-order models for geometrically nonlinear structures, with a particular emphasis on the so-called STiffness Evaluation Procedure (STEP), relying on the static application of prescribed displacements in a finite-element context. We show that a particularly slow convergence of the modal expansion is observed when applying the method with 3D elements, because of nonlinear couplings occurring with very high frequency modes involving 3D thickness deformations. Focusing on the case of flat structures, we first show by computing all the modes of the structure that a converged solution can be exhibited by using either static condensation or normal form theory.We then show that static modal derivatives provide the same solution with fewer calculations. Finally, we propose a modified STEP, where the prescribed displacements are imposed solely on specific degrees of freedom of the structure, and show that this adjustment also provides efficiently a converged solution.
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