Academic literature on the topic 'Allocation de tolérances'
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Journal articles on the topic "Allocation de tolérances":
Bélisle, Luc, and Lucie Maillette. "Stratégie de tolérance au vent chez Salix uva-ursi, une espèce de la toundra du Nouveau-Québec (Canada)." Canadian Journal of Botany 66, no. 2 (February 1, 1988): 272–79. http://dx.doi.org/10.1139/b88-045.
Dissertations / Theses on the topic "Allocation de tolérances":
García, Gómez Sonia C. "Allocation et optimisation de tolérances géométriques par des polyédres prismatiques." Electronic Thesis or Diss., Bordeaux, 2023. http://www.theses.fr/2023BORD0504.
Geometric and dimensional deviations of mechanical components can cause problems of assemblability and/or functionality of the mechanisms. The geometric and dimensional specifications represent the limits of the manufacturing defects of a given surface. Tolerance specification is not an easy task because (i) the assigned tolerance values affect the functionalities of a system and the manufacturing cost of its parts, and (ii) design tolerances are often interrelated and contribute to a resultant tolerance.Tolerance analysis and tolerance synthesis are the two typical ways to approach the problem of tolerance design. Tolerance synthesis is traditionally seen as a "constrained optimization problem" in which the objective function is usually a cost function, a quality function or a cost-quality.In the case of over-constrained mechanisms, the interaction of the tolerances is complex and it is not possible to describe it by means of an analytical function. Hence, it is typical to do tolerance allocation instead of tolerance synthesis. The objective of the tolerance allocation is then to complete or augment the tolerance specification, originally made from experience or empirical knowledge, by incorporating some heuristics or optimization methods.In this work we show how to do tolerance allocation using the prismatic polyhedral approach as tolerance model and the simulated annealing as the heuristic optimization algorithm. In order to do this, some intermediate problems are discussed, such us (i) quality of the operands, (ii) computational time required to do a simulation and we also develop (iii) an indicator to quantify the compliance of a mechanism with its functional condition
Etienne, Alain. "Intégration Produit / Process par les concepts d'activités et de caractéristiques clés - Application à l'optimisation de l'allocation des tolérances géométriques." Phd thesis, Université de Metz, 2007. http://tel.archives-ouvertes.fr/tel-00224938.
Lahoud, Samer. "Routage et allocation de flots avec tolérance aux pannes dans les réseaux Internet nouvelle génération." Télécom Bretagne, 2006. http://www.theses.fr/2006TELB0011.
Khelassi, Ahmed. "Nouvelle méthodologie de synthèse de lois de commande tolérante aux fautes garantissant la fiabilité des systèmes." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00618655.
Khelassi, Ahmed. "Nouvelle méthodologie de synthèse de lois de commande tolérante aux fautes garantissant la fiabilité des systèmes." Electronic Thesis or Diss., Nancy 1, 2011. http://www.theses.fr/2011NAN10041.
The works developed in this thesis deal with the active fault tolerant control design incorporating actuators reliability. This new methodology requires the adaptation of the reliability analysis tools with the system control field. The explicit integration of load in the actuators reliability models is considered. First, the reconfigurability analysis of fault tolerant control systems is treated. A reliable reconfigurability analysis based on the energy consumption with respect to overall system reliability is presented. A reconfigurability index which defines the functional limitation of the system is proposed based on fault severity and actuators reliability degradation. The second part of the developed works is devoted to control allocation and re-allocation. Two approaches of control re-allocation are proposed by taking into consideration actuator degradation health. The control inputs are applied to the system with respect to actuators reliability and faults. The third part contributes to a fault tolerant controller design incorporating actuator criticality. A sensitivity analysis of the overall system reliability and criticality indicator are proposed. A new method of active fault tolerant control is developed with Linear Matrix Inequality (LMI) formulation based on actuator criticality
De, Luna Almeida Alessandro. "Replication heuristics for agents fault tolerance : a plan-based approach." Paris 6, 2008. http://www.theses.fr/2008PA066656.
Moataz, Fatima Zahra. "Vers des réseaux optiques efficaces et tolérants aux pannes : complexité et algorithmes." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4077/document.
We study in this thesis optimization problems with application in optical networks. The problems we consider are related to fault-tolerance and efficient resource allocation and the results we obtain are mainly related to the computational complexity of these problems. The first part of this thesis is devoted to finding paths and disjoint paths. Finding a path is crucial in all types of networks in order to set up connections and finding disjoint paths is a common approach used to provide some degree of protection against failures in networks. We study these problems under different settings. We first focus on finding paths and node or link-disjoint paths in networks with asymmetric nodes, which are nodes with restrictions on their internal connectivity. Afterwards, we consider networks with star Shared Risk Link Groups (SRLGs) which are groups of links that might fail simultaneously due to a localized event. In these networks, we investigate the problem of finding SRLG-disjoint paths. The second part of this thesis focuses on the problem of Routing and Spectrum Assignment (RSA) in Elastic Optical Networks (EONs). EONs are proposed as the new generation of optical networks and they aim at an efficient and flexible use of the optical resources. RSA is the key problem in EONs and it deals with allocating resources to requests under multiple constraints. We first study the static version of RSA in tree networks. Afterwards, we examine a dynamic version of RSA in which a non-disruptive spectrum defragmentation technique is used. Finally, we present in the appendix another problem that has been studied during this thesis
Çokuslu, Deniz. "Découverte et allocation des ressources pour le traitement de requêtes dans les systèmes grilles." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1730/.
Grid systems are today's one of the most interesting computing environments because of their large computing and storage capabilities and their availability. Many different domains profit the facilities of grid environments. Distributed query processing is one of these domains in which there exists large amounts of ongoing research to port the underlying environment from distributed and parallel systems to the grid environment. In this thesis, we focus on resource discovery and resource allocation algorithms for query processing in grid environments. For this, we propose resource discovery algorithm for query processing in grid systems by introducing self-stabilizing topology control and converge-cast based resource discovery algorithms. Then, we propose a resource allocation algorithm, which realizes allocation of resources for single join operator queries by generating a reduced search space for the candidate nodes and by considering proximities of candidates to the data sources. We also propose another resource allocation algorithm for queries with multiple join operators. Lastly, we propose a fault-tolerant resource allocation algorithm, which provides fault-tolerance during the execution of the query by the use of passive replication of stateful operators. The general contribution of this thesis is twofold. First, we propose a new resource discovery algorithm by considering the characteristics of the grid environments. We address scalability and dynamicity problems by constructing an efficient topology over the grid environment using the self-stabilization concept; and we deal with the heterogeneity problem by proposing the converge-cast based resource discovery algorithm. The second main contribution of this thesis is the proposition of a new resource allocation algorithm considering the characteristics of the grid environment. We tackle the scalability problem by reducing the search space for candidate resources. We decrease the communication costs during the query execution by allocating nodes closer to the data sources. And finally we deal with the dynamicity of nodes, in terms of their existence in the system, by proposing the fault-tolerant resource allocation algorithm
Kissai, Moad. "Optimal Coordination of Chassis Systems for Vehicle Motion Control." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLY004/document.
A large interest has been given recently to global chassis control. One of the main reasons for this would be the approach of fully autonomous vehicles. These vehicles, especially the SAE (J3016) level 5 of automation, are expected to replace the human driver in all situations. The automated vehicle should be able to manage coupled situations in harmony where longitudinal control, lateral control, and eventually vertical control are involved. To do so, the vehicle has more than one embedded system per control axis. Equipment suppliers and new entering automotive actors are continually proposing new solutions to satisfy a specific performance required from future passenger cars. Consequently, the car manufacturer has to coordinate different subsystems coming from different stakeholders to ensure a safe and comfortable driving experience. Until these days, car manufactures favoured simple solutions consisting on adding a coordination layer downstream the competing subsystems in order to mitigate eventual conflicts. Most of strategies adopted consist on prioritizing one system over another depending on predictable conflicting scenarios. Autonomous vehicles need additional subsystems to operate safely. Interactions between these subsystems will increase to the point of becoming unpredictable. This thesis focus on the coordination approach that should be adopted by future vehicles. Particularly, the coordination layer is moved upstream the standalone subsystems to ensure an optimal control distribution. This layer acts as a supervisor depending on optimization-based control allocation algorithms. The control synthesis is based on robust control theories to face environmental changes and the vehicle’s parameters and dynamics uncertainties. Results showed first that even regarding today’s vehicles, the upstream approach can offer additional advantages when it comes to multiple objectives problems solving. In addition, the upstream approach is able to coordinate subsystems of vehicles with a higher over-actuation. Fault-tolerance can be ensured between completely different chassis systems, and qualitative objectives, if rigorously formalized, can be satisfied. The more numerous subsystems will get in the future, the more relevant the upstream approach would become to vehicle motion control. We expect that the important benefits shown in this thesis thanks to an optimal upstream coordination approach would encourage car manufacturers and equipment to switch towards more open solutions, propose together the necessary standardizations, and accelerate the autonomous vehicles development
Liu, Xinyi. "Contribution to adaptative sliding mode, fault tolerant control and control allocation of wind turbine system." Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0295/document.
The main challenges for the deployment of wind energy conversion systems (WECS) are to maximize the amount of good quality electrical power extracted from wind energy over a significantly wide range of weather conditions and minimize both manufacturing and maintenance costs. Wind turbine's efficiency is highly dependent on environmental disturbances and varying parameters for operating conditions, such as wind speed, pitch angle, tip-speed ratio, sensitive resistor and inductance. Uncertainties on the system are hard to model exactly while it affects the stability of the system. In order to ensure an optimal operating condition, with unknown perturbations, adaptive control can play an important role. On the other hand, a Fault Tolerant Control (FTC) with control allocation that is able to maintain the WECS connected after the occurrence of certain faults can avoid major economic losses. The thesis work concerns the establishment of an adaptive control and fault diagnosis and tolerant control of WECS. After a literature review, the contributions of the thesis are:In the first part of the thesis, a nonlinear uncertain model of the wind energy conversion system with a doubly fed induction generator (DFIG) is proposed. A novel Lyapunov-based adaptive Sliding Mode (HOSM) controller is designed to optimize the generated power.In the second part, a new output integral sliding mode methodology for fault tolerant control with control allocation of linear time varying systems is presented. Then, this methodology has been applied in order to force the wind turbine speed to its optimal value the presence of faults in the actuator