Archives Ouvertes HAL
Toutes les publications de l'ENAC en direct.
All ENAC publications.
[tel-01589046] Automated Airspace Sectorization by Genetic Algorithm
With the continuous air traffic growth and limits of resources, there is a need for reducing the congestion of the airspace systems. Nowadays, several projects are launched, aimed at modernizing the global air transportation system and air traffic management. In recent years, special interest has been paid to the solution of the airspace sectorization problem. This thesis is devoted to studying the airspace sectorization in Europe and the possibilities to improve it. The airspace sectorization needs to be optimized with the support of automation in order to increase an adaptability of airspace sector configurations to the new traffic demands. The aim of the first part of...
[hal-01587228] EDURA: an Evolvable Demonstrator for Upset Recovery Approaches with a 3D-printed Launcher
As in-flight loss of control has remained a severe threat to aviation, aeronautical research designed several approaches for upset recovery, few of which has been demonstrated in flight tests. The on-going success of micro air vehicles, however, rises the possibility of cheap and flexible flight demonstrations. In this paper, we present the concept of and first steps towards an aerial experimental platform for upset recovery: EDURA. EDURA is part of the CONVEX project to investigate,develop, and demonstrate non-linear upset recovery control laws in a fixed-wing MAV.
[hal-01587218] Investigation of Oriented Magnetic Field Effects on Entropy Generation in an Inclined Channel Filled with Ferrofluids
Dispersion of super-paramagnetic nanoparticles in nonmagnetic carrier fluids, known as ferrofluids, offers the advantages of tunable thermo-physical properties and eliminate the need for moving parts to induce flow. This study investigates ferrofluid flow characteristics in an inclined channel under inclined magnetic field and constant pressure gradient. The ferrofluid considered in this work is comprised of Cu particles as the nanoparticles and water as the base fluid. The governing differential equations including viscous dissipation are non-dimensionalised and discretized with Generalized Differential Quadrature Method. The resulting algebraic set of equations are...
[hal-01577836] Multidimensional Data Exploration by Explicitly Controlled Animation
Understanding large multidimensional datasets is one of the most challenging problems in visual data exploration. One key challenge that increases the size of the exploration space is the number of views that one can generate from a single dataset, based on the use of multiple parameter values and exploration paths. Often, no such single view contains all needed insights. The question thus arises of how we can efficiently combine insights from multiple views of a dataset. We propose a set of techniques that considerably reduce the exploration effort for such situations, based on the explicit depiction of the view space, using a small multiple metaphor. We leverage this...
[hal-01575705] Combination of optimal control approaches for aircraft conflict avoidance via velocity regulation
This paper deals with optimal control applied to one of the most crucial and challenging problems in Air Traffic Management that of aircraft conflict avoidance. We propose an optimal control model where aircraft separation is achieved by changing the speeds of aircraft, and the integral over a time window of their squared accelerations is minimized. Pairwise aircraft separation constraints constitute the main difficulties to be handled. We propose an original decomposition of the problem into 3 zones, in such a way that in two of them, no conflict occurs. Then, using the Pontryagin maximum principle, 2 new formulations of the original optimal control problem are proposed...
[hal-01575758] Towards 4D Trajectory Tracking for Transport Aircraft
This paper presents a new approach to perform 4D trajectory tracking for transportation aircraft. As current systems are extensions of 3D guidance with overfly time constraints at some given points and no general control framework has been developed for 4D guidance of a transport aircraft; the main goal of the proposed approach is to introduce a new method based on the inversion of the flight dynamics while avoiding numerical issues. A six degree of freedom model for a wide body transportation aircraft was developed in Matlab to provide a numerical simulation of the proposed approach, showing satisfying results.
[hal-01569254] AN ADAPTATIVE MULTI-AGENT MODEL OF DELAYS PROPAGATION IN THE AIR TRAFFIC SYSTEM
In the air transportation system, airports are connected by companies operating flights in different ways. One is to use a shuttle system, with a high number of evenly scheduled daily flights. In such a case, a delay occurring will be smoothed out using the buffer effect of the remaining rotating flights. On the other hand, companies operating a single rotation will only be able to mitigate the delay using the turnaround duration. It is the same for transit flights. In existing simulation environments, such a fine structure is not taken into account, even if some tools were designed in the context of rail transportation. The purpose of the present work is to provide the...
[tel-01570242] Architecture de communication sécurisée d’une flotte de drones
Grâce aux progrès de miniaturisation des systèmes embarqués, les mini-drones qu’on appelle en anglais Small Unmanned Aerial Vehicle (UAVs) sont apparus et permettent de réaliser des applications civiles à moindres coûts. Pour améliorer leurs performances sur des missions complexes (par exemple, pour contourner un obstacle), il est possible de déployer une flotte de drones coopératifs afin de partager les tâches entre les drones. Ce type d’opération exige un niveau élevé de coopération entre les drones et la station de contrôle. La communication entre les drones de la flotte est donc un enjeu important dans la réalisation des opérations d’une flotte de drones. Parmi les...
[hal-01567619] Next-generation Computer-aided Composition Environment: A New Implementation of OpenMusic
O7 is a new implementation of the OpenMusic computer-aided composition environment. This paper gives a general presentation of its visual programming framework, musical structures, and in-built graphical editors. It also describes embedded features for the interactive and dynamic execution of musical processes, and for digital signal processing.
[hal-01469783] Interactive exploration of 3D scanned baggage
An interactive visualization system can support volumetric data exploration in airport security screenings by addressing the challenges unique to the baggage inspection. The proposed system includes a set of interaction techniques that combine the direct manipulation of voxels and their interactive visualization. The system's final tools and GUI design incorporate feedback from airport personnel and were validated by real-world users in terms of effectiveness and ease of use.