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Weather is known to play an important role in the management of air traffic. Using an existing traffic flow optimization environment, the impacts of different weather perturbations on the airspace are analyzed. Simulations to opti...
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Weather is known to play an important role in the management of air traffic. Using an existing traffic flow optimization environment, the impacts of different weather perturbations on the airspace are analyzed. Simulations to optimize traffic flows using estimates of controller taskload in the degraded environment are run and their results are compared with ETMS data. They highlight the discrepancies between nominal and perturbed conditions, and point out further promising research topics.
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Distributed system architectures are gaining attention for their use in modern control systems because they provide a few important advantages over the traditional ones such as a smaller computational load required per component, ...
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Distributed system architectures are gaining attention for their use in modern control systems because they provide a few important advantages over the traditional ones such as a smaller computational load required per component, tolerance to their component failures, and the ease of fixing them. A turbine engine is one of the applications that could benefit from these distributed architectures. Despite the benefits, the distributed architecture requires special attention to its common communication network since it becomes a backbone of the entire system. Although a backup network can be used to improve the overall reliability, it would be beneficial to develop understandings of the system behaviors due to underlying imperfections of the communication network such as noises, delays, and packet losses. To study these variables, the hardware-in-the-loop simulation of the full authority digital engine control system must be constructed in order to execute the developed software on the target hardware. This allows us to differentiate between the simulations of engine physics running on a high-performance computer, and of the control algorithm and software driver implemented on the embedded hardware aimed to be used on the actual turbine engine system. Besides, it allows us to implement a common communication network which is not possible for the case of doing software-in-the-loop. Once the system is separated, we can perform the experiments for this hardware in an extreme environment with high temperature and pressure where they are supposed to be during the actual engine operation. Therefore, this work aims to develop the testbed for performing this concept of hardware-in-the-loop simulation. This paper presents a detailed development of a hardware-in-the-loop testbed for distributed turbine engine control systems. Furthermore, the experiments are conducted in order to make a comparison with the software-in-the-loop simulation.
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Commercial air travel is the safest transportation modality available to humanity today. It has achieved this enviable status by deploying thousands of professionals, including pilots, cabin crew, mechanics, dispatchers, and air t...
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Commercial air travel is the safest transportation modality available to humanity today. It has achieved this enviable status by deploying thousands of professionals, including pilots, cabin crew, mechanics, dispatchers, and air traffic controllers to operate air vehicles, bringing them and their passengers safely from origin to destination while managing dangerous weather, other traffic and system failures for decades. The air transportation has been undergoing undeniable and continuous progress and modernization since its inception. We introduce Ariadne, a thread to accelerate the productivity gains achieved by air traffic services providers around the globe. Ariadne is an engineered version of the common sense practice of always keeping a "Plan B", and possibly "plans C, D, E, and F" against unexpected events when any decision is made by pilots, air traffic controllers, dispatchers, and any other safety-critical actor of the air transportation system. The name "Ariadne" was chosen to honor the mythical character Ariadne, daughter of Minos the king of Crete, who conceived the "Plan B" mechanism that would allow her lover to exit Daedalus' Labyrinth after killing the Minotaur. Ariadne and its informal definition as "Plan B engineering" offer surprising opportunities and properties, including not only provable operations safety with unproven components, but also a thread that can inherently be scaled up and quickly adapt to new air traffic scenarios, including the transition to free flight and accommodation of unmanned aviation. It also supports existing operations and therefore it does not conflict with current air traffic control practices. Modern computational capabilities and powerful AI algorithms make its implementation increasingly feasible to address more aspects of air traffic management. Ariadne can be readily generalized to other contexts, such as Robotics and any safety-critical cyber-physical system.
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摘要 :
Commercial air travel is the safest transportation modality available to humanity today. It has achieved this enviable status by deploying thousands of professionals, including pilots, cabin crew, mechanics, dispatchers, and air t...
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Commercial air travel is the safest transportation modality available to humanity today. It has achieved this enviable status by deploying thousands of professionals, including pilots, cabin crew, mechanics, dispatchers, and air traffic controllers to operate air vehicles, bringing them and their passengers safely from origin to destination while managing dangerous weather, other traffic and system failures for decades. The air transportation has been undergoing undeniable and continuous progress and modernization since its inception. We introduce Ariadne, a thread to accelerate the productivity gains achieved by air traffic services providers around the globe. Ariadne is an engineered version of the common sense practice of always keeping a "Plan B". and possibly "plans C, D, E, and F" against unexpected events when any decision is made by pilots, air traffic controllers, dispatchers, and any other safety-critical actor of the air transportation system. The name "Ariadne" was chosen to honor the mythical character Ariadne, daughter of Minos the king of Crete, who conceived the "Plan B" mechanism that would allow her lover to exit Daedalus' Labyrinth after killing the Minotaur. Ariadne and its informal definition as "Plan B engineering" offer surprising opportunities and properties, including not only provable operations safety with unproven components, but also a thread that can inherently be scaled up and quickly adapt to new air traffic scenarios, including the transition to free flight and accommodation of unmanned aviation. It also supports existing operations and therefore it does not conflict with current air traffic control practices. Modern computational capabilities and powerful AI algorithms make its implementation increasingly feasible to address more aspects of air traffic management. Ariadne can be readily generalized to other contexts, such as Robotics and any safety-critical cyber-physical system.
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This paper presents a new methodology that aims to rapidly generate 3-D sector proximity maps, which indicate the probability of presence of at least one or two aircraft at any given point in a considered sector. The maps are gene...
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This paper presents a new methodology that aims to rapidly generate 3-D sector proximity maps, which indicate the probability of presence of at least one or two aircraft at any given point in a considered sector. The maps are generated using an aircraft flow model driven from historical data. Time-varying flow char-acteristics such as routes, speed, probability density function of the inter-arrival time between two consecutive aircraft, were determined using ETMS data. The maps are intended to be a predictive tool for traffic flow management in order to anticipate for a given time period how different flows may interact together and to predict which "critical" regions may be subject to possible conflict between aircraft.
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Reduced-gravity environments created by airplanes have a wide range of potential applications, such as astronaut training and scientific research in zero- or partial- gravity levels. Reduced-gravity flights, casually called parabo...
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Reduced-gravity environments created by airplanes have a wide range of potential applications, such as astronaut training and scientific research in zero- or partial- gravity levels. Reduced-gravity flights, casually called parabolic flights, can be achieved by making aircraft follow specific trajectories. This work describes the physics behind reduced-gravity flights and develops a flight control framework for a zero-gravity flight using a proof-inass-tracking approach. During the zero-gravity parabola phase, aircraft has a zero local (non-gravitational) acceleration and be in a state of free-fall, thus causing the sensation of weightlessness. Hence, the control objective is to simultaneously compensate for aerodynamic drag using thrust control and to make lift force zero by regulating the aircraft with the elevator. A triple-integral control structure is adopted to overcome the unknown drag that is expected to grow quadratically with time. Moreover, the position deviation from the reference object is measured in the cockpit to enable a better control performance. Flight simulations are performed and visualized to illustrate the proposed control strategy.
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The advancement in small unmanned aerial systems (UAS) technology has led to the creation of novel vehicle designs with unique rotor configurations. Some of these configurations involve rotor-rotor wake interactions that can impac...
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The advancement in small unmanned aerial systems (UAS) technology has led to the creation of novel vehicle designs with unique rotor configurations. Some of these configurations involve rotor-rotor wake interactions that can impact the performance of the rotors and the overall efficiency of the vehicle. This paper presents empirical data that illustrates how the rotor-rotor wake interactions impact the performance of a tandem rotor system as well as a novel multi-agent UAS, named the Dodecacopter.
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摘要 :
The advancement in small unmanned aerial systems (UAS) technology has led to the creation of novel vehicle designs with unique rotor configurations. Some of these configurations involve rotor-rotor wake interactions that can impac...
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The advancement in small unmanned aerial systems (UAS) technology has led to the creation of novel vehicle designs with unique rotor configurations. Some of these configurations involve rotor-rotor wake interactions that can impact the performance of the rotors and the overall efficiency of the vehicle. This paper presents empirical data that illustrates how the rotor-rotor wake interactions impact the performance of a tandem rotor system as well as a novel multi-agent UAS, named the Dodecacopter.
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In the not too distant future, Unmanned Aircraft Systems (UAS) will be a source of economic power in urban environments. These systems will be used for package delivery, building inspections, filming, and many other tasks. However...
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In the not too distant future, Unmanned Aircraft Systems (UAS) will be a source of economic power in urban environments. These systems will be used for package delivery, building inspections, filming, and many other tasks. However, economic benefits should not outweigh public safety. These systems must not collide into buildings, and they must maintain a safe separation distance from neighboring systems. In other words, UAS operations should be assessed for safety. This paper assesses how safety requirements in the urban environment influence UAS operations. It presents a novel way of performing this assessment by using the Extensible Trajectory Optimization Library (ETOL) to continuously solve a vehicle guidance problem (VGP) in a multi-agent robot simulator. This paper introduces the common structure of a VGP, along with a VGP formulation for a UAS in an urban environment. In addition, a platform for safety assessments is presented, along with recommendations for improving the safety of UAS operations.
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摘要 :
In the not too distant future, Unmanned Aircraft Systems (UAS) will be a source of economic power in urban environments. These systems will be used for package delivery, building inspections, filming, and many other tasks. However...
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In the not too distant future, Unmanned Aircraft Systems (UAS) will be a source of economic power in urban environments. These systems will be used for package delivery, building inspections, filming, and many other tasks. However, economic benefits should not outweigh public safety. These systems must not collide into buildings, and they must maintain a safe separation distance from neighboring systems. In other words, UAS operations should be assessed for safety. This paper assesses how safety requirements in the urban environment influence UAS operations. It presents a novel way of performing this assessment by using the Extensible Trajectory Optimization Library (ETOL) to continuously solve a vehicle guidance problem (VGP) in a multi-agent robot simulator. This paper introduces the common structure of a VGP, along with a VGP formulation for a UAS in an urban environment. In addition, a platform for safety assessments is presented, along with recommendations for improving the safety of UAS operations.
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