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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v1.i23.40
20 pages

Formulation of Modal-Based Elements in Nonlinear, Flexible Multibody Dynamics

Olivier A. Bauchau
Georgia Inst. of Technology
Jesus Rodriguez
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA

RÉSUMÉ

This article is concerned with modeling elastic components in nonlinear, flexible multibody systems. The behavior of the elastic components will be represented by a modal expansion, thereby greatly reducing the computational cost of the simulation. In this work, a floating frame approach is used. The total motion of the elastic body consists of the superposition of the rigid body motions of the floating frame and of elastic motions that are assumed to remain small. The proposed formulation makes use of a component mode synthesis technique that leaves the analyst free to choose any type of modal basis and simplifies the connection of the elastic components to other components of the system. The proposed formulation is independent of the finite element analysis package used to compute the modes of the elastic components. It is also shown that in the absence of elastic deformations, the formulation recovers the exact equations of motion for a rigid body.


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