Academic literature on the topic 'Désaccordage structurel'
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Journal articles on the topic "Désaccordage structurel"
Capiez-Lernout, E. "Modèle probabiliste des incertitudes en dynamique des structures pour le désaccordage des roues aubagéesProbabilistic model of random uncertainties in structural dynamics for mistuned bladed disks." Mécanique & Industries 4, no. 5 (October 2003): 585–94. http://dx.doi.org/10.1016/j.mecind.2003.07.015.
Full textDissertations / Theses on the topic "Désaccordage structurel"
Schneider, Alexandra Patrizia. "Aerodynamic and aeroelastic investigation of a composite fan for ultra-high-bypass-ratio aircraft engines." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0018.
Full textModern low-speed Ultra-High Bypass Ratio (UHBR) fans operate predominantly on the flat part of the compression characteristic, have shorter intake lengths, and employ flexible, lightweight, composite blades. These changes promote the evolution of different types of instabilities with multi-physical interactions such as convective non-synchronous vibration (NSV). To enable further technological ad-vancements, experimental benchmark data on representative geometries required. Within this con-text, the European project CATANA was initiated at Ecole Centrale de Lyon. The open-test-case fan stage ECL5 was designed, following industrial guidelines, and tested experimentally on the facility ECL-B3. This thesis presents the experimental results of the CATANA project. The experimental investiga-tion of the ECL5 reference configuration shows that all design goals have been reached. The machine is operational in a wide range and aerodynamic performance at design condition is exactly coincident with the numerical prediction. In contrast, instability mechanisms are more complex than predicted by the employed numerical methods. Through application of synchronized multi-physical instrumenta-tion, the involved complex fluid-structure interaction is resolved. The analysis of the influence of in-flow conditions and geometrical and structural system symmetry allows to identify the sensitivity of aerodynamic and structural characteristics and the behavior close to the stability limit. The investiga-tion of a second rotor configuration featuring structural mistuning highlights the importance of geo-metrical blade-to-blade variations. They cause an asymmetry of the aerodynamic field at the blade tip and suppress coherently propagating aerodynamic disturbances resulting in a delayed onset of NSV. The results presented in this thesis provide a comprehensive multi-physical characterization of the ECL5 fan stage and serve as a benchmark data set for the validation of numerical simula-tions
Capiez-Lernout, Evangéline. "Application au désaccordage des roues aubagées.Dynamique des structures tournantes à symétrie cyclique en présence d'incertitudes aléatoires." Phd thesis, Université de Marne la Vallée, 2004. http://tel.archives-ouvertes.fr/tel-00009409.
Full textdynamique basses fréquences du désaccordage des structures tournantes à symétrie cyclique. La classe de structure étudiée est
la roue aubagée. Tout d'abord, un modèle probabiliste non paramétrique récent est utilisé pour construire une approche
probabiliste directe, permettant d'analyser l'amplification dynamique de la réponse forcée des aubes, induite par le
désaccordage. En particulier, une telle approche permet de modéliser de manière cohérente le désaccordage en fréquences des
aubes et le désaccordage en modes des aubes. Ensuite, une approche probabiliste inverse, reposant sur une méthode
d'identification des paramètres de dispersion du modèle probabiliste non paramétrique, est construite afin de déterminer les
tolérances des aubes, conduisant à une probabilité donnée du facteur d'amplification dynamique de la réponse forcée. Enfin, ces
méthodologies sont mises en oeuvre numériquement sur un exemple numérique simple et sur un modèle complexe de roue aubagée.
Les réponses forcées désaccordées obtenues par le modèle probabiliste non paramétrique et par le modèle probabiliste
paramétrique classiquement utilisé pour la problématique du désaccordage sont comparées. Par ailleurs, la méthodologie du
problème inverse permet d'optimiser les tolérances de l'aube pour réduire l'amplification de la réponse forcée. L'analyse des
résultats valide la pertinence des méthodologies proposées.
Capiez-Lernout, Evangéline. "Dynamique des structures tournantes à symétrie cyclique en présence d'incertitudes aléatoires : application au désaccordage des roues aubagées." Université de Marne-la-Vallée, 2004. http://www.theses.fr/2004MARN0218.
Full textThe 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
Sternchüss, Arnaud. "Multi-level parametric reduced models of rotating bladed disk assemblies." Phd thesis, Ecole Centrale Paris, 2009. http://tel.archives-ouvertes.fr/tel-00366252.
Full textMaynadier, Jérôme. "Approches statistiques et fiabilités en dynamique des structures." Toulouse, INSA, 2003. http://www.theses.fr/2003ISAT0017.
Full textThe improvement of the cyclic symmetry structures in turboshaft engines requires an accurate valuation of extreme vibrations which are reaching by these components. The amplitudes of the response of cyclic symmetry structures vary significantly in function of small perturbations named "mistuning". In general, mistunings are random parameters. Usually their effects on the vibration amplitudes are estimated from the experience of each motorist. Hence, at the present time, they are verified with the help of experiences by installation of strain gauges on pieces. To anticipate the evolutions of technologies the numerical approaches are necessary. In structure dynamics, the classical approach used to estimate the probability to reach a vibratory amplitude is the Monte Carlo method, efficient to the biggest probabilities, but extremely expensive when probabilities decrease. The most critical vibration amplitudes corresponding to the lowest probabilities, the probabilistic methods FORM and SORM are first considered. We develop then an original method named "separated variables method". Finally, a statistical approach by extreme values distribution on threshold overstepping with a Pareto law is kept to predict the queue of the distribution of the maximal amplitude of the forced responses. This law bases on a minimum quantities of simulations. After the validation of these different approaches on academic examples, the most efficient one are applied on industrial cases. We consider a cyclic symmetric structure modelled by a reduced model. This type of simplified modelization is able to represent the greatest part of configurations met when running