Academic literature on the topic 'Dimensionnement Préliminaire'
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Journal articles on the topic "Dimensionnement Préliminaire":
Loire, Rémi, Hervé Piégay, Jean-René Malavoi, G. Mathias Kondolf, and Gabriel Melun. "Les lâchers morphogènes depuis un barrage justification opérationnelle et protocole d'intervention." La Houille Blanche, no. 3 (June 2020): 66–75. http://dx.doi.org/10.1051/lhb/2020030.
Trebouet, D., A. Berland, J. P. Schlumpf, P. Jaouen, and F. Quemeneur. "Traitement de lixiviats stabilisés de décharge par des membranes de nanofiltration." Revue des sciences de l'eau 11, no. 3 (April 12, 2005): 365–82. http://dx.doi.org/10.7202/705312ar.
Dissertations / Theses on the topic "Dimensionnement Préliminaire":
Mazhoud, Issam. "Contribution à l'optimisation en conception préliminaire de produit." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI028/document.
The optimization in product design is a high added-value activity. This is all the more important when it is performed at the early stages of the design process. The work presented in this thesis is placed in this context. It proposes adapted decision making tools in preliminary design following two criteria: whether or not the model contains functionals, and whether it takes into considerations the uncertainties. A method based on interval arithmetic and constraint propagation allowing to perform deterministic global optimization is introduced. This method allows handling optimization models without functionals and without considering uncertainties. A reformulation that permits to improve the algorithm convergence is introduced. A stochastic optimization method based on particular swarms is introduced in order to handle higher dimensional problems. A new constraint handling mechanism is introduced and tested on engineering problems. This algorithm has also been extended to design problems with ordinary differential equations constraints. In order to consider uncertainties, a robust optimization method is introduced. It combines a stochastic optimization method with an uncertainty propagation method called PoV. An extension of PoV to models involving functionals is introduced
Dericquebourg, Thomas. "Méthodologie de conception préliminaire robuste des assemblages vissés basée sur des modèles de pré-dimensionnement." Toulouse, INSA, 2009. http://www.theses.fr/2009ISAT0031.
In the current context, consisting in continually reducing the design process duration, it is fundamental to make relevant choices upstream of the projects so as to avoid late reconsiderations, that are time and resources consuming, and to enable an efficient concurrent engineering. The first steps of the design process are characterized by the uncertainties and the main parameters indeterminations. As a result, the first choices have to be robust against the potential data and parameters variations that may appear all along the design process. In the automotive industries, the bolted joints are widespread since they are practical for setting up removable junctions between subassemblies. However, tools for pre-dimensioning them are lacking. Although numerous models do exist, they essentially handle single-bolt joints or specific applications, or the models are too much time consuming to be used in a preliminary phase. That is why a robust approach to the preliminary design of bolted joints has been developed. This approach is firstly based on the development of pre-dimensioning models, a generic local model dedicated to describe a single bolt joint and a global model in order to take into consideration multi-bolted joints. The reduced time requirement has continually be considered so as to then integrate theses models in a preliminary robust design strategy. The robust approach to the preliminary design of bolted joints uses a local pre-dimensioning model to describe the complex behavior of a bolted-joint in a very short time. This model is generic enough to handle several kinds of parts and its validity field has been clearly defined to know its limits. The methodology is then based on a global model that enables to consider multi-bolted joints and so their mutual interactions. This approach has been validated on a specified bolted joints category. Eventually a robust pre-design strategy has been carried out from the previous models. This strategy consists in scanning different potential configurations in order to design a multi-bolted joint assembly and in estimating the associated risks and the projected costs for each configuration. In this strategy, optimized designs of experiments are used as well as an innovative clustering approach to aggregate solutions and then to give some shape recommendations of the assembly and so to guide the sequel step of detail design. Actually, the overall methodology allows to give a set of relevant information concerning the faulty risks and the projected costs of possible solutions in a reduced time. These data can then help the designer to make the best choices of a configuration for a bolted joints assembly in a preliminary design with a risk and cost control
Picheral, Laura. "Contribution à la conception préliminaire robuste en ingéniérie de produit." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00992390.
Trabelsi, Hassen. "Contribution à la prise en compte d'exigences dynamiques en conception préliminaire de systèmes complexes." Phd thesis, Châtenay-Malabry, Ecole centrale de Paris, 2014. http://tel.archives-ouvertes.fr/tel-01017111.
Reysset, Aurelien. "Conception préliminaire d'actionneurs électromécaniques - outils d'aide à la spécification et à la génération de procédures de dimensionnement pour l'optimisation." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0003/document.
The aim of this thesis is to bring a package of software tools included in a whole methodology dealing with mechatronic systems design. It comes as an add-on to the work already carried out at the laboratory in the field of the new generation of aircraft actuation systems: electromechanical actuators (EMA). This technology triggers new problematics leading the engineers to modify their development process as early as the specification phase, when mission profiles have to be generated/transformed/analyzed in order to simplify the design and ensure the validation step. Thus a Simulink toolbox has been created to meet the need for an information translator working as an intermediate between airframer and system-supplier. As for all the embedded systems, the designer has to face some performance-lifetime-integration trade-off, which can be considered as an optimization problem described by a set of equations and constraints. Particular attention is paid here to the conditioning of those explicit equations in order to obtain a standardized calculation sequence adapted to many optimization algorithms. The method and implemented software, both based on the graph theory, interact with the designer to inform him on the possible singularity and algebraic loop issues, providing some leads for their resolution. Finally, some preliminary sizing studies of landing gear and primary flight control surfaces (aileron and spoiler) actuation systems are presented to highlight the possibilities brought out by this innovative approach: integrated design with complex kinematics, collaborative multi-partners design, use of response surfaces to speed up the optimization
Denieul, Yann. "Conception préliminaire de surfaces de contrôle et lois de commande pour configurations d’avions non conventionnelles." Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0033/document.
Next generation of civil transport aircraft is likely to be a radical change in overallconfiguration compared to traditional tube-and-wing design. From a handling qualities perspective,current trend in modern airliners is to evolve towards more and more unstable aircraft, bothfrom longitudinal and lateral-directional point of view. As a consequence future aircraft may notbe controllable by human operator without stabilizing control laws. It then becomes necessaryto consider flight control systems contribution early in the design phase for control surfaces,empennages and actuators sizing, as opposed to traditional way of working dealing only withopen-loop criteria for preliminary sizing. Instead of an iterative process of sizing and controllaws synthesis, we propose to concurrently optimize control surfaces, actuators and flight controllaws taking into account longitudinal and lateral instability as well as industrial structure forcontrollers, for unstable configurations such as Blended Wing-Body (BWB). This “co-design”procedure enables sizing of physical aircraft parameters taking into account benefits from feedbackstabilization for counteracting external disturbance such as atmospheric turbulence, thus leadingto safer and more optimal aircraft configurations
Birman, Jessie. "Quantification et propagation d'incertitude dans les phases amont de projets de conception d'avions : de l'optimisation déterministe à l'optimisation sous contraintes probabilistes." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2269/.
Conceptual aircraft sizing is the first step in the development project of a passenger transport aircraft. Classically, in this phase, a lot of aircraft configurations are compared after having been globally sized thanks to a deterministic, multidisciplinary and constrained optimisation problem. The purpose is to determine the main characteristics of the airplane according to a set of Top Level Requirements. At preliminary stage, designers have to deal with limited knowledge and high uncertainty when solving this problem. Managing that uncertainty is a major issue: assessing its impact on the design in the early stage allows to save time and cost. This PhD thesis introduces a new methodology to solve the aircraft design optimisation affected by uncertainty. First of all, the main source of uncertainty involved at this stage is identified as predictive model uncertainty, which is part of epistemic uncertainty. This uncertainty is quantified within a probabilistic framework. For that purpose, based on the Beta distribution, we create a new generic distribution function able to assume a wide range of distribution shapes: it is called Beta-Mystique distribution. Second of all, we realise uncertainty propagation studies with Monte Carlo and moment propagation methods, in order to analyse the robustness of aircraft configuration according to a set of uncertainties. Finally, a chance constrained optimisation is solved to produce a robust aircraft configuration. Two strategies are considered: the use of Surrogate models to approximate the probabilities and the resolution of the optimisation problem thanks to the moment propagation method
Pollet, Félix. "Conception optimale de drones électriques : une approche multidisciplinaire avec analyse des incertitudes, de la tolérance aux pannes et des impacts environnementaux." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0013.
Unmanned aerial vehicles (UAVs) have undergone intensive development in recent years. Owing to their cost-effectiveness and versatility, UAVs are expected to gain popularity in a wide range of applications, such as parcel delivery, power line monitoring and precision farming. Concurrently, the development of new technologies and their integration into various drone concepts is expanding the range of design alternatives. This is driving the need for holistic design approaches with better technology integration, faster development time and greater modularity.The thesis develops and implements a methodology for the conceptual design of electric multirotor, fixed-wing and hybrid vertical take-off and landing (VTOL) UAVs. The framework enables the optimal sizing of a UAV from arbitrary specifications on the mission, technological choices and architecture, using a comprehensive multidisciplinary approach.Starting from a set of analytical models including scaling laws and regressions, a generic sizing methodology is developed. The proposed methodology relies on an efficient multidisciplinary design and optimization (MDO) formulation, which enables fast convergence to the UAV candidate with best performances. In particular, the application of this approach enables to rapidly assess the effects of changes in the requirements. Next, the uncertainties surrounding the models and the availability of optimal components on the market are assessed. To mitigate critical uncertainties in UAV performance, the sizing methodology is extended to allow the design to be optimized using catalogues of existing components instead of models. Finally, the thesis develops two specific aspects of UAV design related to regulatory and societal challenges. On the one hand, recent regulations issued by the European Union Aviation Safety Agency (EASA) impose a level of safety for specific categories of UAVs. To this end, an approach is proposed to assess the controllability of various architectures in the event of failures. The assessment is further linked to the design framework to achieve fault-tolerance sizing of the rotors and control surfaces. On the other hand, societal acceptance of UAVs is strongly related to environmental concerns, including but not limited to climate change and resource consumption. This challenge is addressed by developing and integrating an environmental discipline into the design framework. The novel approach enables to assess the sensitivity of environmental impacts to mission requirements and technological assumptions, as well as minimizing environmental burdens at the earliest design stages.The thesis contributes to the development of a unified framework for optimizing the design of electric UAVs with a holistic approach. As such, it is relevant to future UAVs designed for applications subject to market, regulatory and environmental issues