摘要 :
In order to comply with the existing performance standard requirements or specifications, a new computational method is proposed for take-off and landing performance, which deals with the characteristics of the high precision of c...
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In order to comply with the existing performance standard requirements or specifications, a new computational method is proposed for take-off and landing performance, which deals with the characteristics of the high precision of calculation parameters in the process of take-off and landing by flight simulation technique. A systematic aircraft model is constructed in detail, including aerodynamic model, engine model, landing gear model, mass model and nonlinear motion equation model. According to flight performance calculation standards and pilot control specifications, the different take-off modes and landing process are studied. Besides, one engine inoperative (OEI) take-off, angle of attack (AoA) hold take-off, standard take-off, reject take-off and landing simulation process are designed. Finally, the corresponding performance computer software is developed to achieve the goal of accuracy and rapid calculation. Simulation result shows that standard take-off distance is related to specified speed, AoA hold take-off distance is longer than standard take-off which needs satisfy speed and AoA requirements, and this method is appropriate for calculating the specific aircraft take-off and landing performance.
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摘要 :
The principles of expert system are proposed in the development of software application for calculations of rational takeoff and landing characteristics.The modular architecture is developed for the process of takeoff and landing ...
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The principles of expert system are proposed in the development of software application for calculations of rational takeoff and landing characteristics.The modular architecture is developed for the process of takeoff and landing parameters calculations in the system.A prototype of a client-server software application for electronic flight bag based on tablet computer was developed on the example of a specific type of Russian aircraft.
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摘要 :
Modeling and simulation of takeoff and landing on carrier can help engineers how to reasonably design or select suited carrier and carrier-based aircraft. Its application in simulators can help the pilots how to fly skillfully. Ma...
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Modeling and simulation of takeoff and landing on carrier can help engineers how to reasonably design or select suited carrier and carrier-based aircraft. Its application in simulators can help the pilots how to fly skillfully. Mathematic models of takeoff and landing on carrier are the theoretic foundation of simulation. The models and simulation of takeoff by means of steamy catapult launcher and that on ski jump flight deck are given in this paper. While the models of landing by means of arresting cable on carrier is introduced. The effects of wind and speed of carrier are analyzed in modeling. The availability and validity of these models are approved by the result of flight simulation.
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摘要 :
Modeling and simulation of takeoff and landing on carrier can help engineers how to reasonably design or select suited carrier and carrier-based aircraft. Its application in simulators can help the pilots how to fly skillfully. Ma...
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Modeling and simulation of takeoff and landing on carrier can help engineers how to reasonably design or select suited carrier and carrier-based aircraft. Its application in simulators can help the pilots how to fly skillfully. Mathematic models of takeoff and landing on carrier are the theoretic foundation of simulation. The models and simulation of takeoff by means of steamy catapult launcher and that on ski jump flight deck are given in this paper. While the models of landing by means of arresting cable on carrier is introduced. The effects of wind and speed of carrier are analyzed in modeling. The availability and validity of these models are approved by the result of flight simulation.
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摘要 :
Take-off and landing performance, which is supposed to satisfy high standard and always plays an important role during the whole lifespan of an aircraft, is necessary to be fully considered and systematically evaluated during the ...
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Take-off and landing performance, which is supposed to satisfy high standard and always plays an important role during the whole lifespan of an aircraft, is necessary to be fully considered and systematically evaluated during the designing process. In this paper, aiming at determining the take-off and landing demands for low-cost UAVs, aero-dynamic analysis and mechanical modeling are launched to calculate the key parameters of related take-off and landing performance. According to different conditions of application, two theoretical models for take-off as well as two for landing process are established in detail, and an original method for correcting aerodynamic drag and fric-tion is proposed. The calculating methods for the time and distance during take-off and landing period are provided while simulation based on MATLAB is carried out to visually present the results. Based on the output of calculation and numerical analysis, the effectiveness and feasibility of the models are verified. The results indicate that the models proposed in this paper are efficient to estimate the take-off and landing performance of low-cost UAVs and also provide rapid and convenient support to carry out demands analysis and the design of low-cost UAVs especially in the preliminary phase.
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The aim of this paper is description of small scale magnetic levitation (MAGLEV) system, (testbench) for demonstration of possibility of aircraft safety take-off and landing assisted by the MAGLEV runway. The testbench supply syst...
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The aim of this paper is description of small scale magnetic levitation (MAGLEV) system, (testbench) for demonstration of possibility of aircraft safety take-off and landing assisted by the MAGLEV runway. The testbench supply system (its electrical and magnetic field characteristics) is measurable. The control system allow to demonstrate the safe take-off and landing on the ground based device. The measuring system is base on photogrammetry, which requires high speed camera and a special software.
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摘要 :
The aim of this paper is description of small scale magnetic levitation (MAGLEV) system, (testbench) for demonstration of possibility of aircraft safety take-off and landing assisted by the MAGLEV runway. The testbench supply syst...
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The aim of this paper is description of small scale magnetic levitation (MAGLEV) system, (testbench) for demonstration of possibility of aircraft safety take-off and landing assisted by the MAGLEV runway. The testbench supply system (its electrical and magnetic field characteristics) is measurable. The control system allow to demonstrate the safe take-off and landing on the ground based device. The measuring system is base on photogrammetry, which requires high speed camera and a special software.
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In this study, we have proposed an unconventional UAV design. We aimed heavy lifting in an efficient way, without using complicated swashplate mechanism. Helicopter consist of two large propellers to carry the main payload, two sm...
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In this study, we have proposed an unconventional UAV design. We aimed heavy lifting in an efficient way, without using complicated swashplate mechanism. Helicopter consist of two large propellers to carry the main payload, two small propellers to stabilize the roll attitude, and two servo motors to control the yaw axis. Large propellers will be more efficient than the small propellers owing to their greater disk area. For this reason, main lifting will be achieved by two large propellers. Conventional quadcopters have "PNPN" (P: Clockwise, N: Counterclockwise) propeller arrangement. However, the system we proposed has "PPNN" propeller arrangement to compensate the reaction torques of equally sized propeller pairs which are placed at opposite sides. However, quadcopters with "PPNN" propeller arrangement loses controllability upon hovering. Therefore, controllability is satisfied by adding servo motors to small propellers for tilting. We have derived the nonlinear dynamic equations, linearized the system around the equilibrium point and performed controllability analysis. An autopilot and controller is designed and, the system is simulated with realistic parameters. System performance is shown to be satisfactory.
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As a new type of aircraft, vertical takeoff and landing UAV has attracted wide attention in the industry. However, it still lacks relevant research about control strategies and solutions to extreme environments. This paper designs...
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As a new type of aircraft, vertical takeoff and landing UAV has attracted wide attention in the industry. However, it still lacks relevant research about control strategies and solutions to extreme environments. This paper designs and validates two schemes for landing modes in two special environments, including landing in high altitude and mountainous and mobile landing on the ship. First, the design of the control law is carried out step by step. Then we have plenty of flight tests and analyze lots of data. We change the control parameters to achieve the desired results. The research indicates that the two schemes are feasible in engineering practice and can provide technical references.
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摘要 :
A novel aircraft take-off and landing performance intelligent computation model was proposed in this paper. First, main factors towards aircraft tableland take-off and landing performance were briefly analyzed. Then, general model...
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A novel aircraft take-off and landing performance intelligent computation model was proposed in this paper. First, main factors towards aircraft tableland take-off and landing performance were briefly analyzed. Then, general model for aircraft tableland take-off and landing performance computation was proposed. Finally, Support Vector Machines (SVM) was applied in real taxing distance data of some type of aircraft. Meantime, so as to show superiority, high-precision etc. virtues of SVM, Bayesian Regularized BP neural networks (BRBP), Radical Basis Function neural networks (RBF), Adaptive Network based Fuzzy Inference Systems (ANFIS) were also investigated. Results show that SVM is well suited for practical engineering use with satisfied generalized performance, as is better than other intelligent computation methods in the case studied in this paper. The proposed intelligent computation model is especially commendable for developing and enriching aircraft take-off and landing performance computation theory.
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