Reduced-order computational model in nonlinear structural dynamics for structures having numerous local elastic modes in the low-frequency range. Application to fuel assemblies

Anas Batou (1) , Christian Soize (1) , N. Brie (2)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
2 EDF R&D - EDF R&D

We are interested in the construction of a reduced-order computational model for nonlinear complex dynamical structures which are characterized by the presence of numerous local elastic modes in the low-frequency band. This high modal density makes the use of the classical modal analysis method not suitable. Therefore the reduced-order computational model is constructed using a basis of a space of global displacements, which is constructed a priori and which allows the nonlinear dynamical response of the structure observed on the stiff part to be predicted with a good accuracy. The methodology is applied to a complex industrial structure which is made up of a row of seven fuel assemblies with possibility of collisions between grids and which is submitted to a seismic loading.

Mots clés: reduced-order model; nonlinear structural dynamics; global elastic modes; local elastic modes; fuel assemblies

Domaines: Mécanique [physics.med-ph]; Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Anas Batou, Christian Soize, N. Brie. Reduced-order computational model in nonlinear structural dynamics for structures having numerous local elastic modes in the low-frequency range. Application to fuel assemblies. Nuclear Engineering and Design, 2013, 262 (-), pp.276-284. ⟨10.1016/j.nucengdes.2013.04.039⟩. ⟨hal-00821274⟩