New State Observer Based On Takai-Sugeno Fuzzy Controller of Induction Motor

International audienceThis paper presents a nonlinear observer-based on Takagi-Sugeno (T-S)fuzzy controller design approach for induction motor (IM). The peculiarity of this paper is the synthesis of a mono-Luenberger observer for highly coupled system. The TS fuzzy model is firstly used to approximate the nonlinear IM systems. Next, based on the differential mean value theorem combined to the sector nonlinearity transformation , a nonlinear fuzzy observer is designed to estimate the system states in order to implement the fuzzy controller. Then, the parallel distributed compensator (PDC) scheme is used to design the fuzzy controller for the overall system. Fuzzy Controller and observer gains are obtained by solving a set of Linear Matrix Inequality (LMI).Finally, illustrative simulation results represented to validate the performance of the proposed approach

Atmospheric Pollutant Flow and Precipitation: Modeling Effects on the Vegetation Ecosystem

Because of their fixed life and wide distribution, plants are the first victims of air pollution. The atmosphere is considered polluted when the increase of the rate of certain components causes harmful effects on the different constituents of the ecosystems. The study of the flow of air near a polluting source (cement plant in our case), allows to predict its impact on the surrounding plant ecosystem. Different factors are to be considered. The chemical composition of the air, the climatic conditions, and the impacted plant species are complex parameters to be analyzed using conventional mathematical methods. In this study, we propose a system based on artificial neural networks. Since artificial neural networks have the capacity to treat different complex parameters, their application in this domain is adequate. The proposed system makes it possible to match the input and output spaces. The variables that constitute the input space are the chemical composition, the concentration of the latter in the rainwater, their duration of deposition on the leaves and stems, the climatic conditions characterizing the environment, as well as the species of plant studied. The output variable expresses the rate of degradation of this species under the effect of pollution. Learning the system makes it possible to establish the transfer function and thus predict the impact of pollutants on the vegetation

Influence of Gaussian Hill on Concentration of Solid Particles in Suspension Inside Turbulent Boudary Layer

AbstractThe soil erosion is a major problem that affects the agriculture, climate and health. It is therefore necessary to understand the phenomena that are its wheels in order to either predict or limit it. One of the main problem of this kind of study is the presence of high particle concentration that restricts measurements of either particle concentration or carrier flow rate. In so numerical simulations are essential for detailed studies. Nevertheless these numerical models have to be performant enough and validated with situations that if they are not realistic are representative of phenomena involved. So here we focused on the problem of the possibility of trapping the solid particles in the recirculation zones. We have reproduced in laboratory a configuration representative of sites with enough steep hills to generate recirculation zones during saltation regimes.Measurements have been made of the dispersion of solid particles released from a rectangular area flushed at the ground of a flat plate on which evolved a turbulent boundary layer. The originality here is that it is flushed at the ground and push up the particles to continuously feed the ground at the same mean rate as the mean local erosion rate. One or more Gaussian hills were disposed transversally to the flow downstream the solid particle injection. Various Reynolds number where chosen to caracterise take-off regimes and recirculation regime behind the Gaussian hill(s). One optical system combined with CMOS camera is used successively to measure the velocity of career fluid or solid particles by PIV. Digital Image treatment is used to separate fluid seeding from solid particle images. Supplementary comparison was done to compare velocity field of the career flow for smooth and rough floor only for kinematic around the hill(s).In this paper, in a first part we will present kinematic caracteristics of the flow whereas in a second part of this work, the data will provide some concentration profiles of solid particles. The results presented concerning the velocity and concentration field are related to streamwise vertical planes at the center of the wind tunnel at successive longitudinal positions. For velocity field we will report different regimes for smooth and rough plate. Only one regime will be presented for solid particles. We present in a first part the kinematic study and in the second part results on the concentrations of solid particles

Guide méthodologique identifiant les enjeux nationaux et transfrontaliers relatifs à la préservation et à la remise en bon état des continuités écologiques et comportant un volet relatif à l’élaboration des schémas régionaux de cohérence écologique : deuxième document en appui à la mise en oeuvre de la Trame verte et bleue en France

Le présent document traduit de façon opérationnelle la mise en oeuvre des principes mentionnés dans le premier volet des orientations nationales. Il vise à assister les partenaires associés à l’élaboration des schémas régionaux de cohérence écologique dans leur travail, et est plus spécifiquement rédigé à l’attention des services des Conseils régionaux et des services régionaux de l'État qui doivent préparer les discussions du comité régional Trame verte et bleue. Une première partie aborde les grands principes d'élaboration de la Trame verte et bleue qui serviront à vérifier sa cohérence nationale. Ils correspondent aux éléments minimum que la Trame verte et bleue doit intégrer. La deuxième partie propose d’une part une présentation synthétique des méthodes qui ont déjà été développées pour mettre en oeuvre une Trame verte et bleue (TVB), et d’autre part pour les régions qui n’ont pas encore lancé leur démarche, une proposition de méthode. La troisième partie expose les outils de mise en oeuvre de la Trame verte et bleue, en ciblant les mesures de nature contractuelle