------------------------------------------------------------- Lettre MODE février 2010 Envoyez vos contributions en format simple texte à champion@univ-tln.fr avant la fin du mois. Prière d'indiquer "pour la lettre MODE" dans l'objet. L'inscription et la désinscription automatiques se font en écrivant à lettre-mode-smai-request@emath.fr et en mettant dans le sujet suivant le cas subscribe ou unsubscribe. ------------------------------------------------------------- Table des matières : -- Stages - Thèses - Postes 1- Sujet de thèse - LAAS 2- Post-doc position in Pisa -- Conférences 3- Annonces de séminaires 4- Conférence ''Transport Optimal de Masse'' 5- Journées SMAI-MODE 2010 6- Eighth EUROPT Workshop "Advances in Continuous Optimization" 7- International Conference on Optimization and Control (ICOCO 2010) 8- International Conference on Optimization, Simulation and Control (Ulaanbaatar) 9- Second Asian Conference on Nonlinear Analysis and Optimization (Phuket) 10- Eighth International Conference of Numerical Analysis and Applied Mathematics 11- revues à céder ------------------------------------------------------------- 1- Sujet de thèse - LAAS (source: Alain Théron et Christophe Louembet) Couleur du sujet : modélisation et commande MPC appliquées au domaine spatial. Voici la présentation exhaustive: PhD position in space modelling and optimal control at LAAS-CNRS Toulouse, France (source: Alain Théron & Christophe Louembet) alain.theron@laas.fr christophe.louembet@laas.fr A PhD position will be available from sept-oct 2010 at LAAS-CNRS Toulouse (France). Financing from CNES & ASTRIUM. Application on the CNES site. CNES contact : jean-claude.berges@cnes.fr http://www.cnes.fr/web/CNES-fr/7419-sujets-2010.php?view=item&item=2202 " Guidage en Rendez-Vous sur orbite par commande prédictive: Étude intégrée des modèles de prédiction et de la robustesse de l'algorithme de commande." The development of methods improving relative dynamics control between artificial satellites is motivated by new needs as autonomous orbital rendezvous (between ATV and ISS, between an orbiter and a capsule around Mars, etc.), formation flying control (deployment, reconfiguration, maintenance), space systems assembling, orbit servicing (geostationary satellites life extension, space garbage cleaning). In order to investigate different ways to achieve these objectives, several European projects are running: PROBA-3 (the ESA formation flying demonstration mission), MSR (devoted to the Martian sample return), SMART-OLEV (which aims the life extension of geostationary satellites), HARVD (which focuses on autonomous orbital rendezvous and docking techniques for future solar system exploration missions),... As increasing motivation and new objectives raised up, it became necessary to revise traditional guidance methods in order to adapt them to autonomous missions design and to develop new algorithms certifying efficiency and robustness of orbital rendezvous guidance. That sets the topic of this thesis up. As far as the homing operation is concerned, one aims an actuated deputy satellite to reach a final relative state with respect to an inert target satellite. This goal is to be achieved in fixed time under fuel optimization constraint thanks to impulsive maneuvers. Actual guidance techniques consist in open loop control since no feedback information about the relative state between the spacecrafts is currently used in the trajectory design. Although these strategies simplify operational achievement, they do not offer rejection capability of perturbations and uncertainties following relative motion model linearization, sensors and embedded actuators technological limitations, etc. To provide Rendezvous guidance with robustness property, an intuitive idea frequently used in the space industry consists in the following iterative procedure: - Generating a constrained maneuvers plan that leads the deputy vehicle to reach a final relative state in fixed time from its current state at the time t0. - Performing the first maneuver of the plan at the time t1 > t0. - Estimating the new current relative state at the time t2 > t1 (e.g. just after effectuation of the first maneuver). - From this new state, generating a new plan of maneuvers to reach the target, and return to Step 2. Although this heuristic method looks like a closed loop strategy, it is not based upon a formal and rigorous analysis that solely ensures stability and robustness with respect to uncertainties and allows performances quantification. To cope with these issues, we intend to tackle the guidance problem in the general framework of the model predictive control (MPC) techniques. Albeit these methods take up the reasoning described above ? e.g. optimizing control actuation under constraints on a receding horizon ? they are mainly designed to take advantage from the feedback pieces of information about the gap between nominal and actual positions and also from the control sequence itself so that it becomes possible to online adapt the control law, soften the constraints or even evolve the model used in the algorithm. It is noteworthy that the feedback concept used in this framework is set upon a specific control structure, adaptive or not, for which the cost function ? which quantifies the rendezvous accuracy ? will be an influent factor on the stability of the whole system. The prospective nature of this way of investigation consists in replacing the previous heuristics by a formal approach that sets the stability, ensures robustness against uncertainty and provides good online performances. Finally, the planned study involves the following steps: - A bibliography stage on model predictive control methods which will be mainly focused on stability analysis, certificate of robustness against uncertainty and performances in the design of the guidance law. - Even if the predictive control offers a theoretical corpus adapted to the control of linear or nonlinear systems, we will restrict to linear relative motion models in order to circumscribe the scope of the thesis. Since the MPC performances rely on the model accuracy, a first step will consists in the development of linearized model able to handle different space perturbations not taken into account yet. A comparative assessment of different models ? existing ones and new ones ? according to criteria to be defined, will help to set a hierarchy of models with respect to precision in terms of propagation (domain of validity) and with respect to the computational cost in a control scheme like MPC (based on-board satellite). - One of the main advantages of the MPC techniques is the ability to handle constraints. In the different rendezvous scenarii, one intends to consider the typical limitations encountered in direct methods for trajectory optimization: constraints on the trajectory and actuators. - Stability and robustness conditions analysis in the rendezvous framework is the second tackled problem. As preliminary step, the literature analysis will allow to state the most relevant conditions to apply for the rendezvous guidance problematic including uncertainties. Then the main investigation will rely on the invariant sets theory and will be correlated with the robust optimization analysis expanded in a recent CNES/LAAS R&T contract. - Finally, the global performances of the exhibited guidance laws will be evaluated through numerical simulations, results of which will be compared to those proceeding from projects as ATV, PRISMA, SIMBOL - X or PROBA-3. ------------------------------------------------------------- 2- Post-doc position in Pisa (source: Luigi Ambrosio) The Scuola Normale Superiore in Pisa announces a selection, based on work to date and possible interview, for a research contract as part of the European Project ERC AdG *GeMeThNES* ?/Geometric Measure Theory in non-Euclidean spaces/?? (Grant Agreement No. 246923). The subject matter will be Geometric Measure Theory in non-Euclidean Spaces and applications to Partial Differential Equations and to the Theory of Optimal Mass Transportation, under the direction of prof. Luigi Ambrosio. Length of contract: 24 months, from September 1, 2010 to August 31, 2012. Gross compensation, inclusive of all taxes: ? 80,500.00 (the actual salary depends on the fiscal position of the contractor and should not be less than ?2.000 per month) Application deadline: February 15, 2010. Information about the selection procedure, the application form and a more detailed description of research themes can be found at: http://www.sns.it/en/borse/collaboratoriesterni/annoincorso/avviso003/ ------------------------------------------------------------- 3- Annonces de séminaires (sources: J. Frédéric Bonnans) Une rubrique pour signaler succinctement les séminaires ayant lieu ce mois-ci et organisés dans nos laboratoires. N'hésitez pas à l'alimenter, préférentiellement via un lien vers la page du séminaire et une liste de conférenciers, ** Séminaire Parisien d'Optimisation (IHP, salle 01) http://www.ann.jussieu.fr/~plc/spo.html Lundi 15 février 2010: J.-P. Aubin (LASTRE) A. Jofré (Universidad de Chile, Santiago) ** ------------------------------------------------------------- 4- Conference ''Transport Optimal de Masse'' (source: Michel Théra) Dear colleagues We would like to draw your attention to the following conference on ''Transport Optimal de Masse'', in Amiens 22 February 2010 : http://www.mathinfo.u-picardie.fr/igbida/ColloqueTOM/colloqueTOM.html Invited speakers : - Y. Brenier (Université de Nice) - G. Bouchitté (Université de Toulon) - C. Evans (University of California, Berkeley) - J. Mazon (Université de Valencia) - E. Oudet (Université de Chambéry) ------------------------------------------------------------- 5- Journées SMAI-MODE 2010 - deadline extension (source: Samir Adly) Les journées SMAI-MODE 2010 auront lieu à Limoges le 24, 25 et 26 mars 2010. Le site internet de ces journées est http://www.unilim.fr/mode2010/ Les conférenciers pléniers attendus sont : Dorin Bucur (Université de Chambéry) Jean-Christophe Culioli (Air France) Moritz Diehl (Université de Louvain, Belgique) Alejandro Jofre (Université de Santiago, Chili) Olivier Ley (Université de Rennes) Jérôme Renault (Université de Toulouse 1) Le Comité d'Organisation ------------------------------------------------------------- 6- Eighth EUROPT Workshop "Advances in Continuous Optimization" (source: Michel Théra) voir le site internet: http://www.europt2010.com/ ------------------------------------------------------------- 7- International Conference on Optimization and Control (ICOCO 2010) (source: Michel Théra) We are pleased to inform you that the International Conference on Optimization and Control (ICOCO 2010) will be held in Guiyang, China on July 18-23, 2010. The purpose of the conference is to provide an international forum for scientists, engineers, researchers, and practitioners to exchange ideas and approaches, to present research findings and state-of-the-art solutions, to share experiences on potentials and limits, and to open new avenues of research and developments, on all issues and topics related to optimization and control theory. The conference is dedicated to the 65th birthday of Professors Kok Lay Teo and Jie Sun who made fundamental contributions to optimization, optimal control, and their computational methods and applications. We expect the participation in this conference of many prominent experts from different countries and regions who will present the state-of-the-art in optimization and control theory. We refer to the website: http://sci.gzu.edu.cn/a/icoco.html ------------------------------------------------------------- 8- International Conference on Optimization, Simulation and Control (Ulaanbaatar) (source: Ider Tseveendorj) The International Conference on Optimization, Simulation and Control (COSC?2010) will take place on July 25-28, 2010 in Ulaanbaatar, Mongolia. This is the third event in the series of conferences on Optimization in Mongolia following two successful meetings held in 2002, 2007. The conference is sponsored by the National University of Mongolia and co-sponsored by a number of other higher education and research institutions. The working language of the conference is English. The goal of COSC?2010 is to bring together engineers, scientists, and mathematicians from a variety of related disciplines, who are at the forefront of their research fields, to exchange ideas and present original high level unpublished research in the areas of optimization and optimal control, with particular interests in the following topics, but not limited to,: -Linear, non-linear, combinatorial, parametric, stochastic, multilevel, multi-objective and global optimization; -Calculus of variations, optimal control, variational inequalities and game theory; -Mathematical Economics; -Interdisciplinary applications of optimization theory (engineering and general sciences); -Biomathematics, protein folding optimization. -Robust, fuzzy optimization -Control Theory -Simulation, Stochastic Process, Numerical Analysis -Optimization in Signal and Image Processing The conference includes invited lectures, mini-symposia and peer reviewed contributed papers. We plan to put together, as guest editors, a Springer book of tutorials/lectures, and, possibly, a special issue of the journal Optimization Letters based on invited papers presented at the conference. Abstract Submission: May 1, 2010 Full Paper Submission: October 1, 2010 Further information can be found at http://www.ise.ufl.edu/cao/cosc2010/ Please pass this information on to anyone you think might be interested in attending. We are looking forward to seeing you in Ulaanbaatar! ------------------------------------------------------------- 9- Second Asian Conference on Nonlinear Analysis and Optimization (Phuket) (source: Abdellatif Moudafi) First Announcement We are pleased to inform you, that The second Asian Conference on Nonlinear Analysis and Optimization will be held in Phuket, THAILAND. The purpose of this conference is to bring together leading Asian researchers to achieve an international or higher level on the research of the Nonlinear Analysis, the Convex Analysis, and the Optimization. We announce this conference for all Asian researchers and students related to these fields to exchange the recent achievements, to share the current problems, and to encourage other researchers who have an interest in these fields. The conference will continue tradition of The first Asian Conference on Nonlinear Analysis and Optimization (NAO-Asia2008) meeting which was held inShimane, Japan. The three-day technical program will consist of keynote speakers, invited speakers and contributed lectures. Each parallel session is scheduled with one hour and forty minutes at most basically, and hence each presentation time will be twenty five minutes. The participants are expected to arrive on September 8th, 2010 and to leave on September 12th, 2010 or September 13th, 2010. The conference web site is at: http://www.sci.nu.ac.th/mathematics/NAO-Asia2010 where you can find more information about the NAO-Asia2010. A second announcement will be announced at the end of March 2010. If you have any questions, please do not hesitate to contact the conference secretariat byusing e-mail address: narinp@nu.ac.th On behalf of the Organizing Committee Dr.Rabian Wangkeeree Department of Mathematics, Fuculty of Science, Naresuan University, Thailand E-mail: rabianw@nu.ac.th ------------------------------------------------------------- 10- Eighth International Conference of Numerical Analysis and Applied Mathematics (source: Michel Théra) Island of Rhodes, Greece September 19-25 2010 http://www.icnaam.org/ Call for Papers for the Symposium Modelling and Numerics of Complex Societal Problems We welcome contributions to the Symposium on ?Modelling and Numerics of Complex Societal Problems?, within the 8th International Conference of Numerical Analysis and Applied Mathematics (Island of Rhodes, Greece, September 19-25 2010). Please send the abstract (no more than 150 words) before May 15, 2010 to Symposium organizer: Laura Scrimali Department of Mathematics and Computer Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy Tel.: +39 095 7383063; Fax +39 095 330094 E-mail: scrimali@dmi.unict.it Home page: http://web.dmi.unict.it/Pagina/It/Didattica/Docenti_e_corsi/Scrimali_Laura.aspx Notification of acceptance: May 31, 2010. After acceptance, full papers must be sent to the organizer within: June 30, 2010. Topics of interest include, but are not limited to: network equilibrium problems, variational analysis in both finite and infinite-dimensional spaces, computation, approximation and algorithms, cooperative and non-cooperative games, projected dynamical systems, climate change, energy market networks, sustainable traffic, communication networks and vulnerability analysis. ------------------------------------------------------------- 11- revues à céder (source: Jean-Baptiste Hiriart-Urruty) Suis prêt à céder les revues suivantes, que j'ai en double. Contrainte : les prendre à Toulouse. Volume total : un sac de sports. - SIAM REVIEW : de 2004 à 2009. - J. of GLOBAL OPTIMIZATION : de 2006 à 2009 - RECHERCHE OPERATIONNELLE-RAIRO : de 2005 à 2009. Jean-Baptiste Hiriart-Urruty ------------------------------------------------------------- Thierry Champion -- Laboratoire Imath -- Université du Sud Toulon-Var page personnelle: http://champion.univ-tln.fr