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Application au désaccordage des roues aubagées.Dynamique des structures tournantes à symétrie cyclique en présence d'incertitudes aléatoires

Abstract : The objective of this research is to propose new probabilistic methodologies for the dynamic analysis of the
mistuning of rotating structures with cyclic symmetry in the low frequency range. The structure under consideration is a bladed
disk. Firstly, a recent nonparametric probabilistic model is used for constructing a direct probabilistic approach, allowing
the dynamic amplification of the forced response on blades induced by mistuning to be analyzed. Particularly, such a
probabilistic approach allows the blade-eigenfrequencies mistuning and the blade-modal-shape mistuning to be modeled with
coherence. Secondly, an inverse probabilistic approach, based on an identification method of the dispersion parameters
controlling the nonparametric probability model, is constructed in order to define the blade tolerances yielding a given
probability level of the dynamic amplification of the forced response. Finally, both methodologies are numerically applied on a
simple case and on a complex structure. The mistuned forced response obtained with the nonparametric probabilistic model and
with the parametric probabilistic approach traditionally used in the mistuning context are compared. In addition, the inverse
probabilistic approach allows the blade tolerances to be optimized in order to reduce the amplifications of the forced
response. The analysis of these results validate the relevance of the proposed methodologies.
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https://tel.archives-ouvertes.fr/tel-00009409
Contributor : E. Capiez-Lernout <>
Submitted on : Tuesday, June 7, 2005 - 9:20:28 PM
Last modification on : Wednesday, February 26, 2020 - 7:06:08 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:05:35 PM

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  • HAL Id : tel-00009409, version 1

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Evangéline Capiez-Lernout. Application au désaccordage des roues aubagées.Dynamique des structures tournantes à symétrie cyclique en présence d'incertitudes aléatoires. Matériaux. Université de Marne la Vallée, 2004. Français. ⟨tel-00009409⟩

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