Global reduced-order model adapted to the low- and medium-frequency analysis of complex dynamical structures

Olivier Ezvan (1) , Anas Batou (1) , Christian Soize (1)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

In structural dynamics, the use of the vibration eigenmodes (elastic modes) allows for obtaining an accurate small-dimension reduced-order model (ROM) for the low-frequency range analysis. For some complex structures with distinct structural levels (presence of flexible parts attached to a stiff master part), numerous local elastic modes are intertwined with the usual global elastic modes, yielding high-dimension ROM. To circumvent this difficulty, a general method is proposed in order to construct a small-dimension ROM whose reduction vector basis is constituted of the global displacements only. The method is applied to an automobile complex structure.

Mots clés: structural dynamics; reduced-order model; global modes; computational model; frequency range; medium-frequency range

Domaines: Mécanique [physics.med-ph]

Olivier Ezvan, Anas Batou, Christian Soize. Global reduced-order model adapted to the low- and medium-frequency analysis of complex dynamical structures. 1st Pan-American Congress on Computational Mechanics, in conjunction with the XI Argentine Congress on Computational Mechanics (PANACM 2015), Apr 2015, Buenos Aires, Argentina. pp.1-7. ⟨hal-01158278⟩