RIVAS RIVAS , Damián

The required fuel load of an aircraft for a given cruise range with uncertain average wind (modelled by a uniform distribution) is studied in this work. The fuel mass probability density function is obtained using an approximate method previously developed by the authors. In addition, the Generalized Polynomial Chaos method is used to study the...

The propagation of initial mass uncertainty in cruise flight is studied. Two cruise conditions are analyzed: one with given cruise fuel load and the other with given cruise range. Two different distributions of initial mass are considered: uniform and gamma type. The generalized polynomial chaos method is used to study the evolution of mean...

An analysis of the effects of wind shear on optimal aircraft cruise trajectories is presented. The procedure considered is cruise at constant Mach number and constant altitude, which is commonly flown by airlines, following air- traffic-control rules. The optimal trajectories correspond to the case of minimum direct-operating-cost cruise with...

La presente invención describe un método y un dispositivo de nebulización de líquidos insecticidas y fito-sanitarios en forma de gotas de tamaño controlado y uniforme, para su liberación desde una aeronave, como puede ser un helicóptero o un avión. Este procedimiento permite la formación de un finísimo chorro estacionario de líquido a través de...

In this paper, a methodology to assess the uncertainty of sector demand when subject to weather uncertainty is presented. The methodology requires the definition of a scenario (in terms of Air Traffic Control sector, flights, and weather forecasts to be considered), the processing of meteorological data (provided by Ensemble Prediction Systems,...

In this paper, the effects of wind uncertainty on the problem of conflict detection are analyzed. The wind components are modeled as random variables; the wind uncertainty is obtained from weather forecasts. The case of two en-route aircraft flying at constant altitude, constant airspeed, constant course, and subject to the same wind is...

Cruise optimization at constant altitude is formulated as a singular optimal control problem. The cases of maximum range, minimum direct operating cost and minimum fuel with fixed arrival time are analyzed, providing a comprehensive analysis of optimum cruise at constant altitude. The case of unsteady cruise with variable aircraft mass has been...

The effects of wind uncertainty on aircraft fuel consumption are analyzed using a probabilistic trajectory predictor. The case of cruise flight subject to an average constant wind is considered. The average wind is modeled as a random variable; the wind uncertainty is obtained from ensemble weather forecasts. The probabilistic trajectory...

Standard flight procedures for climb, cruise and descent, commonly flown by commercial aircraft, are analyzed, and the optimality of their performance is assessed by comparison with the perfor- mance of optimal trajectories, which are computed using the theory of singular optimal control. Three flight procedures are studied: CAS/Mach climb,...

The problem of aircraft trajectory prediction subject to weather uncertainty is addressed. In particular, a probabilistic analysis of aircraft fuel consumption taking into account wind uncertainty is presented. The wind uncertainty is obtained from ensemble weather forecasts. The analysis is focused on the cruise flight, which is composed of...

A probabilistic aircraft conflict detection and reso- lution method considering wind uncertainty is proposed in this paper. The wind components are modeled as random variables, described by a joint probability density function. The case of two en-route aircraft flying with constant airspeed in the same airspace and flight level with...

The optimization of the aircraft route taking into account wind uncertainty is addressed in this work. The wind uncertainty is obtained from ensemble weather forecasts. A structured airspace is considered, which is defined by a set of waypoints and a set of allowed connections between each pair of waypoints. The analysis is focused on a cruise...

The optimisation of the aircraft route taking into account wind and temperature uncertainties is addressed in this work. These uncertainties are obtained from ensemble weather forecasts. A structured airspace is considered, which is defined by a set of waypoints and a set of allowed connections between each pair of waypoints. The analysis is...

This paper presents a methodology to tackle the problem of strategic aircraft conflict detection and resolution, up to 60 minutes in advance, considering wind and temperature uncertainties. The problem of hundreds of en-route aircraft flying multi-segmented 2D trajectories is considered. The weather uncertainty is retrieved from Ensemble...

The generation of optimal trajectories for UAVs in the presence of an average horizontal wind is studied. The generation is performed off line (strategic planning). The approach is based on the discretization of the aircraft intent and in the formulation of a parametric optimization problem. For the computation of the trajectory, a dynamic,...

In this paper, a probabilistic approach to en-route sector demand prediction at tactical level subject to thunderstorm activity is presented. The source of uncertainty is the location of the convective cells affecting the sector. An ensemble-based stochastic methodology is developed that takes into account the stochastic evolution of the...

Understanding and managing weather uncertainty is a necessity that the future Air Traffic Management system must address to increase its capacity, efficiency and safety levels. In this paper, a methodology to tackle the problem of aircraft conflict detection in the terminal maneuvering area of an airport considering wind uncertainty is...

The meet-time problem in arrival management is analyzed, that is, the problem of generating conflict-free tra- jectories that meet the scheduled times of arrival. The conflict- resolution algorithms developed are based on the parameteriza- tion of the aircraft intents, using predefined trajectory patterns that model the aircraft trajectories...

In this paper, a first step to analyse the effects of reducing the uncertainty of aircraft trajectories on sector demand is presented. The source of uncertainty is wind, forecasted by Ensemble Prediction Systems, which are composed of different possible atmosphere realizations. A trajectory predictor determines the routes to be followed by the...

Complexity science is the multidisciplinary study of complex systems. Its marked network orientation lends itself well to transport contexts. Key features of complexity science are introduced and defined, with a specific focus on the application to air traffic management. An overview of complex network theory is presented, with examples of its...

Ala (1) de avión deformable con extradós móvil que comprende un doble revestimiento (7) sobre el extradós del ala (1) del que uno de los revestimientos (7) corresponde al borde de ataque (2) y otro corresponde al borde de salida (3) y se solapan en la zona central del ala con posibilidad de desplazamiento relativo entre ambos revestimientos (7)...