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Reduced-order model for nonlinear dynamical structures having a high modal density 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. 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.
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https://hal-upec-upem.archives-ouvertes.fr/hal-00806396
Contributor : Christian Soize <>
Submitted on : Saturday, March 30, 2013 - 6:34:58 PM
Last modification on : Thursday, March 19, 2020 - 11:52:02 AM
Long-term archiving on: : Sunday, April 2, 2017 - 10:56:58 PM

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  • HAL Id : hal-00806396, version 1

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Anas Batou, Christian Soize, N. Brie. Reduced-order model for nonlinear dynamical structures having a high modal density in the low-frequency range. MEDYNA 2013, 1st Euro-Mediterranean Conference on Structural Dynamics and Vibroacoustics, Apr 2013, Marrakech, Morocco. pp.1-4. ⟨hal-00806396⟩

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