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Performance analysis of PMSM servo-drive with state feedback and hybrid position controllers
No full textInternational audienceHigh-performance operation of servo-drive with permanent magnet synchronous motor (PMSM) is required in many industrial applications, including robotics, machines, and, recently, aircraft components. Complex control structures are necessary to meet the specific requirements of these applications. In this paper, two control structures developed for position control of PMSM servodrive are presented. The state feedback control (SFC) structure augmented by state variables' limitation and load torque compensation is presented and compared with a hybrid control structure (HSC) where the inner current control loop exists. An experimental evaluation of both control schemes regarding dynamic properties, disturbance compensation, and robustness against the moment of inertia changes is included
Power Hardware and Driver-in-the-Loop for Battery Testing applied to Electrified Vehicles
No full textInternational audienceThis paper presents a unified approach to include a driver and a power subsystem in a testing simulation loop. The aim is to create a kind of lab-based vehicle offering an alternative to the Vehicle-in-the-Loop (ViL) approach or vehicle prototype for battery testing. This lab-based vehicle is built around experimental test benches and a driving simulator to reproduce a vehicle in a laboratory. A unified approach is used to easily identify inputs and outputs between the model vehicle and the emulation interfaces. The unified approach is based on the Energetic Macroscopic Representation (EMR) formalism. A Power Hardware-in-the-Loop (P-HiL) simulation is introduced for battery testing. Furthermore, standalone battery testing is extended to include a Driver in the Loop (DiL). A case study based on a retrofitted Plug-in Hybrid Electric Vehicle (P-HEV) is presented with experimental results
Cities and Urban areas with Mobility based on Innovation and carbon Neutrality: CUMIN programme extension
No full textInternational audienceTo limit the global warming, the greenhouse gases (GHG) have to be reduced. In Europe the transport is one of the main contributor to GHG. Since 2010, University of Lille does regularly a carbon footprint report. The commuting represents more than 50% of its GHG. In 2016, the CUMIN (Campus of University with Mobility based on Innovation and carbon Neutrality) interdisciplinary programme of University of Lille has been developed to propose electromobility solutions to contribute to a significant reduction of the commuting GHG. This research program is now extended to "Cities and urban areas". CUMIN develops a crossdisciplinary approach combining technological, economic and social aspects. It brings together 3 research groups on sciences & technologies, 3 research groups on human & social sciences and the MEL (Métrople Européenne de Lille). The CUMIN programme is presented and first results are discussed
Embedded Spectroscopy: Potentialities and Constraints for Onboard Battery Diagnostics
No full textThis paper was presented at the EPE 2025 conference and was subsequently selected for publication in the special issue of Elsevier's PEDC journal. Therefore, only the abstract appears on the conference website.International audienceThis paper introduces an on-board Electrochemical Impedance Spectroscopy (EIS) technique for battery diagnostics, utilizing numerical simulations and experimental results. EIS, commonly used in laboratories to assess charge transfer and diffusion in electrochemical cells, is ideal for monitoring battery performance, state of charge, and health. However, traditional EIS equipment is too large and expensive for automotive use. The proposed system offers a compact, cost-effective solution for electric vehicles. We discuss the challenges and trade-offs for accurate on-board measurements, based on simulations. Prototype results are then compared with laboratory EIS measurements on 260 A.h Li-NMC EV pouch cells, demonstrating that embedded spectroscopy achieves precise results, even for low-impedance cells. The study highlights the potential of this technique as a reliable and effective method for battery diagnostics in automotive applications
MRAS-based sensorless field oriented controlled axial flux permanent magnet synchronous machine with additional parameter adaptation
No full textInternational audienceThe characteristics of a sensorless control method for synchronous machines with a parallel model are investigated, in consideration of additional online parameter adaptation. Using error compensated reference voltage inputs the parallel model's parameters are adapted to the synchronous machine by comparing the model current output with the measured current values. Thus the adaptation to the reference transfer behavior of the system is accomplished using an implicit method. After describing the difference between the reference and the adaptive model mathematically, the system stability is analysed using Popov's hyperstability condition. An additional stability criterion could be derived from the full machine model. The extension of the sensorless control was achieved through a simultaneous adaptation algorithm accounting for coupling effects caused by the influence of misalignment of the field-coordinates
Sparsified-Learning for Heavy-Tailed Locally Stationary Processes
No full textSparsified Learning is ubiquitous in many machine learning tasks. It aims to regularize the objective function by adding a penalization term that considers the constraints made on the learned parameters. This paper considers the problem of learning heavy-tailed LSP. We develop a flexible and robust sparse learning framework capable of handling heavy-tailed data with locally stationary behavior and propose concentration inequalities. We further provide non-asymptotic oracle inequalities for different types of sparsity, including -norm and total variation penalization for the least square loss
TAILORED GAUSSIAN PROCESS KERNELS FOR LEARNING REPRESENTATIVE VOLUME ELEMENTS (RVE) FROM EBSD TEXTURE DATA OF POLYCRYSTALS
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Le jardin partagé, un commun pour une nouvelle relation à la Nature en ville ?
No full textCet article est à l’origine un travail réalisé dans le cadre de l’enseignement « Les philosophies de la nature et l’ingénieur contemporain » (UV IS04 de l’UTC). Les étudiant.e.s y conduisent une enquête critique, de type philosophique, sur un dispositif soutenable de leur choix, en l’occurrence le jardin partagé.International audienceEn milieu urbain, la présence de la nature relève aujourd’hui majoritairement d’espaces ornementaux qui, s’ils peuvent parfois receler un intérêt écologique, continuent à reproduire le dualisme Homme/Nature qui a présidé au développement des villes contemporaines. Peu appropriables puisque réservés à la contemplation, mais aussi soigneusement maîtrisés et subordonnés aux fins humaines, ces espaces sont le reflet d’une conception philosophique particulière – à la fois naturaliste et humaniste – de la Nature, qui appréhende cette dernière comme une entité extérieure à l’humain. Cet article propose d’étudier un objet urbain singulier faisant figure d’anomalie au sein de cette matrice philosophique : le jardin partagé. Parce qu’il permet une réappropriation de l’espace urbain par les communs et parce qu’il introduit une triple expérience inédite de la nature, à la fois instrumentale, organique et phénoménologique, celui-ci pourrait-il parvenir à renouveler le lien humain/Nature, en l’affranchissant de cette relation de face à face ? Bien que l’étude des usages et des modes de gouvernance des jardins partagés révèle la permanence d’une forme d’anthropocentrisme autant qu’un manque de perméabilité de ses frontières – du point de vue physique mais aussi social – qui limite ses capacités transformatives, des voies de transformation du dispositif, axées autour des notions d’intégration et d’extension, laissent entrevoir des perspectives enthousiasmantes pour la transition écologique et sociale des villes
FPT implicit enumeration of active schedules
No full textInternational audienceWe consider in this paper the resource constrained scheduling problem with release times and deadlines. We develop an original dynamic programming algorithm generating a compact representation of all feasible active schedules for the decision problem inspired from classical branch-and-bound approaches with no time windows. This algorithm is proved to be fixed-parameter tractable (FPT in short) parameterized by the maximum number of jobs overlapping following time windows and the maximum processing time. New dominance rules are also presented to improve the time complexity of our algorithm. Lastly, we also develop an enhanced version of our algorithm to optimize any regular separable objective function. It is shown that this new version of our algorithm has the same time complexity and hence is FPT with the relevant two parameters
Evaluation des impacts environnementaux de prothèses dentaires fixes
No full textNational audienceGrâce à l’évolution des matériaux et des techniques en dentisterie, mettant en avant l’intégration croissante de la technologie numérique, les prothèses obtenues par CFAO remplacent celles issues de méthodes dites conventionnelles. Bien que cette évolution vers l’intégration numérique, améliore la précision et l’efficacité dans la production, celle-ci soulève aussi des inquiétudes quant à ses impacts environnementaux, notamment en termes de consommation de ressources, de gestion des déchets et d’émissions polluantes. L’évaluation des impacts environnementaux des prothèses obtenues par voie numérique constitue donc un enjeu majeur pour l’industrie dentaire.Les méthodes d’évaluation environnementale, notamment l’Analyse de Cycle de Vie, qui quantifie les impacts environnementaux à chaque étape du cycle de vie des prothèses (extraction des matières premières, transport, fabrication, utilisation, fin de vie) sont mises en oeuvre dans cette étude. Selon la littérature, le processus de transformation des matériaux prothétiques nécessite d'importantes quantités d'eau et sont énergivores. La fabrication des prothèses en cabinet ou en laboratoire génère également des déchets dont la gestion est souvent négligée par les praticiens. Aussi, les prothèses en fin de vie sont généralement mises en décharge, sans qu’aucune filière de retraitement ne soit prévue pour le moment. L’étude se concentre sur l’un des biomatériaux de restauration parmi les plus utilisés : vitrocéramique au disilicate de lithium.Cette étude souligne l’importance d’intégrer ces évaluations environnementales dans les processus décisionnels des professionnels de la santé dentaire et propose des axes d’amélioration destinés aux industriels et praticiens afin de promouvoir des pratiques respectueuses de l’environnement et d’encourager une dentisterie plus durable