Prédimensionnement d’un drone : Partie aérodynamique et mécanique du vol
Wautelet, Gaëtan
2010
Ce travail de fin d’étude synthétise les différentes étapes et investigations
réalisées pour le pré-dimensionnement des surfaces portantes de forme rectangulaire
d’un drone, d’une masse d’environ 10 kg, qui a pour mission de
prendre des images stéréoscopiques d’un objectif tout en tournant autour à
une altitude constante proche du sol, et s’adresse à toute personne appelée
à s’occuper de la modélisation aérodynamique des surfaces portantes d’un
drone, dont le point de design est obtenu sur base de la mécanique du vol
en tournant. A partir de la réalisation d’un modèle expérimental à l’échelle
1 : 2 sans surfaces de contrôle et sans système propulsif électrique à hélice,
les observations des résultats des essais en soufflerie permettent d’améliorer
notre modèle aérodynamique et d’adapter éventuellement les paramètres
géométriques du design. A l’aide des résultats expérimentaux, l’enveloppe de
vol a pu être tracée en tenant compte des rafales.
Article (Scientific journals)
The influence of equivalent contact area computation in extended node to surface contact elements
Wautelet, Gaëtan; Ponthot, Jean-Philippe
2014 • In Key Engineering Materials, 618, p. 1-22
This article aims at extending the node to surface formulation for contact problems with
an area regularization as proposed by [1]. For that purpose, two methods are proposed to compute the equivalent contact area attributed to each slave node. The first method, which is based on a geometrical approach through force equivalence, is an original extension of the one proposed in [1] for two-dimensional contact problems, i.e. plane stress and plane strain state, to the axisymmetric modelling context. The second method relies on an energy consistent way obtained through the virtual work principle and the same expression for the equivalent contact area as the one originally cited in [2] is then recovered. First, the node to surface strategy with area regularization is introduced and the aforementioned methods for the equivalent contact area are presented in detail and compared. Afterwards a consistent linearization technique is applied to achieve a quadratic convergence rate in the Newton Raphson iterative procedure used to solve the non-linear equilibrium equations of the underlying finite element model. Finally, two axisymmetric numerical examples are provided in order to compare the aforementioned equivalent contact area evaluations and to demonstrate the performance and the robustness of the consistent approach especially in the neighbourhood the revolution axis.
Peer Reviewed verified by ORBi
Unpublished conference/Abstract (Scientific congresses and symposiums)
Efficient and Robust Automatic Augmented Lagrangian Algorithm for Solving Frictional Contact Problems - Application to Wire Drawing Process
2016 • In Key Engineering Materials, 681, p. 19-46
This paper extends the frictionless penalty-based node to contact formulation with area regularization to a 3D framework. Based on our previous work [1] focused on axisymmetric modeling, two computational methods are also considered for the determination of the slave node area. The first method, named as the geometrical approach, is based on a force equivalence system, while the second one, named as the consistent approach, is derived from a more sophisticated scheme elaborated upon the virtual work principle. Then, the extended contact elements are derived for the contact formulations with geometrical and consistent area regularization and a consistent linearization is provided accordingly, which guarantees a quadratic rate of convergence of the global Newton Raphson iterative procedure. Finally, two numerical examples assess the performance of both contact formulations with area regularization and demonstrates the robustness and the efficiency of the node to surface contact formulation with consistent area regularization in reproducing a constant contact pressure distribution across the interface between a deformable body and a analytically-defined rigid body, irrespective of
the mesh. Our findings will certainly encourage further developments towards the design of a penalty based node to surface contact algorithm passing the contact patch test, as was already done successfully in 2D contact problems [2].
Peer Reviewed verified by ORBi
Other (Reports)
Projet 5S
Wautelet, Gaëtan
2010
Ce rapport synthétise les différentes étapes et investigations réalisées pour
la préparation et l’implémentation d’un projet 5S dans les ateliers industriels
de Mécamold et s’adresse à toute personne appelée à initier ou à participer
à un projet 5S. D’origine japonaise, le projet 5S est une démarche participative,
systématique et rigoureuse en 5 étapes distinctes soutenant qu’un
environnement et un poste de travail propres et bien organisés facilitent un
travail sécuritaire, efficace et de qualité. Les 5S ou le management visuel
constituent la base de tout programme « Lean Manufacturing » d’amélioration
continue en étant un puissant levier du management pour la mise en
oeuvre d’autres méthodes telles que la « Total Productive Maintenance » et
la « Single Minute Exchange of Die ».