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Communication dans un congrès

Accelerated NAS via pretrained ensembles and multi-fidelity Bayesian Optimization

Houssem Ouertatani, Cristian Maxim, Smail Niar, El-Ghazali Talbi

Bayesian optimization (BO) is a black-box search method particularly valued for its sample efficiency. It is especially effective when evaluations are very costly, such as in hyperparameter optimization or Neural Architecture Search (NAS). In this work, we design a fast NAS method based on BO.…

33rd International Conference on Artificial Neural Networks (ICANN), Sep 2024, Lugano, Switzerland. ⟨10.1007/978-3-031-72332-2_17⟩. ⟨hal-04611343⟩

Article dans une revue

Fixed-Time Fault-Tolerant Adaptive Neural Network Control for a Twin-Rotor UAV System with Sensor Faults and Disturbances

Aymene Bacha, Abdelghani Chelihi, Hossam Eddine Glida, Chouki Sentouh

This paper presents a fixed-time fault-tolerant adaptive neural network control scheme for the Twin-Rotor Multi-Input Multi-Output System (TRMS), which is challenging due to its complex, unstable dynamics and helicopter-like behavior with two degrees of freedom (DOFs). The control objective is to…

Drones, 2024, 8 (9), pp.467. ⟨10.3390/drones8090467⟩. ⟨hal-05074853⟩

Thèse

Wear of hot forging tools : towards an objective optimization of the durability., Usure des outils de forgeage à chaud : vers une optimisation objective de la durée de vie

Nasrine Boualem

During the hot forging process, tools are subjected to severe cyclic mechanical and thermal loads. These extreme forming conditions can damage the tools through the development of abrasive wear, cracking, and thermal and mechanical fatigue. These damages compromise the mechanical strength of the…, Durant le processus de forgeage à chaud, les outils sont soumis à des chargements mécaniques et thermiques cycliques sévères. Ces conditions de formage extrêmes peuvent endommager les outils par le développement d'usure abrasive, de fissuration, de fatigue thermique et mécanique. Ces dommages…

Mechanics [physics.med-ph]. Université Polytechnique Hauts-de-France, 2024. English. ⟨NNT : 2024UPHF0026⟩. ⟨tel-04779884⟩

Article dans une revue

Boundedness and local stability of oscillation in a class of piecewise affine systems

Xinyong Wang, Laurentiu Hetel, Jimmy Lauber, Ying Tang

This paper investigates self-oscillation behaviors occurring in a class of piecewise affine (PWA) systems. We address a particular case of PWA systems with two subsystems and a linear switching surface. Conditions are given for characterizing forward invariant sets containing self-oscillating…

Automatica, 2024, 167, pp.111745. ⟨10.1016/j.automatica.2024.111745⟩. ⟨hal-04780020⟩

Article dans une revue

Underbody flow control for base drag reduction of a real car model

Laurent Keirsbulck, Olivier Cadot, Marc Lippert, David Boussemart, Jérémy Basley, Sébastien Delprat, Sébastien Paganelli

A 1:5 scale realistic car model of the original Twingo GT but presenting a flat underbody and no exhaust line is tested in a wind tunnel at Reynolds numbers Re = 2.15 × 10^5 to 4.3 × 10^5. A range of underbody flow characteristic velocities Ub = [0.5 − 0.72]U∞ (U∞ the free-stream velocity) is…

Journal of Wind Engineering and Industrial Aerodynamics, 2024, 252, pp.105822. ⟨10.1016/j.jweia.2024.105822⟩. ⟨hal-04819727⟩

Article dans une revue

A coupled finite element-discrete element method for the modelling of brake squeal instabilities

Cédric Hubert, Yassine El Attaoui, Nicolas Leconte, Franck Massa

The work presented here proposes a contribution on the analysis of brake squeal phenomenon using a transient coupled finite element-discrete element method (FEM-DEM) simulation with pad surface topography evolution. To build the coupled FEM-DEM model, a non-overlapping strong coupling is first…

European Journal of Mechanics - A/Solids, 2024, 108, pp.105427. ⟨10.1016/j.euromechsol.2024.105427⟩. ⟨hal-04877940⟩

Chapitre d'ouvrage

Interface Characterization by Nanoindentation and EBSD of Cu/Cu and Al/Cu Joints Produced by Magnetic Pulse Welding (MPW)

Benjamin Zielinski, Tarik Sadat, Rudy Dubois, José La Barbera, Cyrille Collin, Lola Lilensten, Denis Jouaffre, Eric Markiewicz, Laurent Dubar

Magnetic Pulse Welding (MPW) is a high-velocity impact welding technique that allows the joining of dissimilar materials such as aluminium and copper. Welding should be produced under the appropriate conditions: impact velocity (200-500 m.s-1) and collision angle (10-30°). The formation mechanisms…

Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity. ICTP 2023, 3, Springer Nature Switzerland, pp.53-63, 2024, Lecture Notes in Mechanical Engineering, 978-3-031-41341-4. ⟨10.1007/978-3-031-41341-4_7⟩. ⟨hal-04279006⟩

Article dans une revue

A nodal-integration-based finite element method for solving steady-state nonlinear problems in the loading’s comoving frame

Yabo Jia, Jean-Baptiste Leblond, Jean-Christophe Roux, Jean-Michel Bergheau

Many thermomechanical processes, such as rolling, turning, grinding, welding or additive manufacturing, involve either a material flowing through a fixed load system or a heat source moving with respect to the material. In many situations, these processes involve a constant speed translational,…

Engineering with Computers, 2024, ⟨10.1007/s00366-024-02046-3⟩. ⟨hal-04800576⟩

Article dans une revue

Protocole d’essai contrôlé randomisé visant à comparer les effets du SNAG entre deux groupes de patients souffrant de lombalgies non spécifiques avec un groupe contrôle, Randomized controlled trial protocol to compare the effects of SNAG among two groups of patients with nonspecific low back pain with a control group

Elisabeth Lye, Vianney Squedin, Hadrien Thomas

Contexte : La lombalgie, affection musculo-squelettique la plus répandue et principale cause d’invalidité en France, peut devenir chronique malgré un pronostic souvent favorable pour la forme aiguë, affectant gravement la qualité de vie et pouvant entraîner une désinsertion sociale et…, Background: Low back pain, the most common musculoskeletal disorder, and the main cause of disability in France, can become chronic Despite an often-favourable prognosis for the acute form. It seriously affects quality of life and can lead to social and professional exclusion.Mulligan techniques…

Revue Scientifique des travaux de fin d'Étude en Rééducation et Réadaptation, 2024, 2, ⟨10.25965/rse2r.281⟩. ⟨hal-04677365⟩

Chapitre d'ouvrage

Ideation, Focus Groups, and Brainstorming

Hursula Mengue-Topio, Youssef Guedira, Sophie Lepreux, Christophe Kolski

Ideation is a key factor of success in more and more domains today. It can be integrated in different ways in projects, whatever the adapted methodological approaches are. Many methods supporting ideation are currently available and are widely used by researchers and practitioners. They evolve…

Constantine Stephanidis, Gavriel Salvendy. User Experience Methods and Tools in Human-Computer Interaction, CRC Press, 37 p., 2024, 9781003495161. ⟨hal-04842371⟩