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Reduced-order model for nonlinear dynamical structures having numerous local elastic modes in the low-frequency range

Abstract : This research is devoted to the construction of a reduced-order computational model for nonlinear dynamical structures which are characterized by the presence of numerous local elastic modes in the low-frequency band. Therefore these structures have a high modal density in the low-frequency band and the use of the classical modal analysis method is not suited here. We propose to construct a reduced-order computational model using a small-dimension basis of a space of global displacements, which is constructed a priori by solving an unusual eigenvalue problem. Then the reduced-order computational model allows the nonlinear dynamical response to be predicted with a good accuracy on the stiff part of the structure. Themethodology 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.
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Contributor : Christian Soize <>
Submitted on : Thursday, September 20, 2012 - 9:57:01 PM
Last modification on : Thursday, March 19, 2020 - 11:52:03 AM
Long-term archiving on: : Friday, December 21, 2012 - 3:52:19 AM

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  • HAL Id : hal-00734174, version 1

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Anas Batou, Christian Soize, N. Brie. Reduced-order model for nonlinear dynamical structures having numerous local elastic modes in the low-frequency range. International Conference on Noise and Vibration Engineering ( ISMA 2012), Katholieke Universiteit Leuven, Sep 2012, Leuven, Belgium. pp.3417-3426. ⟨hal-00734174⟩

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