Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 81 for “"flight tests"”.
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Vehicle design, flight control avionics, and flight tests for the Parent and Child Unmanned Air Vehicle
… The planning and execution of several flight tests is presented.
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Development and Ground Testing of Direct Measuring Skin Friction Gages for High Enthalpy Supersonic Flight Tests
… engines, with a progression from free-jet ground tests to a design for an actual hypersonic scramjet-integrated flight vehicle. The designs were non-nulling, with a sensing head that was flush with the model wall and surrounded by a small gap. Thus, the shear force due to the flow along the wall …
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Pilot-in-the-loop simulated flight tests of a loss-of-control prediction and prevention system for NASA's Transport Class Model
… problem has led to the development of an in-flight LoC prediction and prevention system, which is based on a quantitative approach for LoC characterization introduced by the Boeing Company and NASA Langley Research Center. This study presents a preliminary assessment of the proposed LoC …
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Neural Network Models for Generating Synthetic Flight Data
<p>Flight test data is a valuable resource used in many aerospace applications. However, procuring a sufficiently large database of flight test data poses several challenges. Nominal flight tests can be expensive and time-consuming and require much post-processing depending on the availability of …
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A precision autonomous parachute delivery system
… a robotic parachute system was designed and flight tests were conducted to evaluate flight performance in deep brakes, for eventual use in autonomous accuracy landing approaches for targets two meters in size or smaller. Numerous design improvements were evaluated and/or implemented, and …
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Vision-Based Control and Flight Optimization of a Rotorcraft UAV
… navigation. This thesis describes the flight tests of the US Army PALACE pro ject, which implements Moravec's pseudo-normalized correlation tracking algorithm. The tracker uses the movement of the landing site in the camera, a laser range, and the aircraft attitude from an IMU to …
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Analysis of a quadrotor in forward flight
… flying at high speed or in prolonged forward flight as the aerodynamics can no longer be ignored. This results in a highly nonlinear system with both aerodynamics and rigid body dynamics affecting the dynamics. In this thesis, a model of a quadrotor that takes into account both rigid-body …
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Subsystem development and flight testing of an electroaerodynamic UAV
… with the optimization tool GPkit and with the flight mission goal of steady-level flight. This thesis describes the design and testing of several subsystems of the UAV, including the power system, the communication system, the aircraft tail, and the aircraft launching system. The power system …
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Progetto e realizzazione del sistema di gestione autonoma del volo e controllo in remoto per un velivolo UAV ad ala rotante
… selection and set-up to final autonomous flight tests. This thesis will focus mainly on the RUAV avionics package set-up, on the onboard software development and final experimental tests. The setup of the electronic package allowed recording of helicopter responses to pilot commands and …
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Investigation of Lateral-Directional Coupling in the Longitudinal Responses of a Transfer Function Simulation Model
… States Air Force's NF-16D Variable stability In-flight Simulator Test Aircraft (VISTA) and created by Henrik Pettersson, can simulate any desired aircraft. The TFSM represents a non-linear aircraft model with its stability parameters - a collection of gain constants, time constants, damping …
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Development of technologies for low-cost oceanographic unmanned aeronautical vehicles
… of pseudo-derivative feedback controllers for flight control, the generation of optimised matrix calculations for high-frequency aircraft state estimates on a low-powered processor and the use of a finite impulse response filter for reduced aliasing of transmitted flight data.<br/>A novel …
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Hybrid Formation Control of Unmanned Helicopters
… on the NUS UAV helicopters and several flight tests are conducted to verify the algorithm.
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Flight Testing Small, Electric Powered Unmanned Aerial Vehicles
Flight testing methods are developed to find the drag polar for small UAVs powered by electric motors with fixed-pitch propellers. Wind tunnel testing was used to characterize the propeller-motor efficiency. The drag polar was constructed using data from flight tests. The proposed methods were …
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Hydrodynamic Modeling for Autonomous Underwater Vehicles Using Computational and Semi-Empirical Methods
… two fold, using data obtained from computational flight tests and using a semi-empirical approach. The three vehicles which this thesis focuses on are two gliders (Slocum and XRay/Liberdade), and a third vehicle, the Virginia Tech Miniature autonomous underwater vehicle.
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Inferring parafoil glide slope by extending unsettled trajectories via simulation
… of a parafoil using Design of Experiments via flight testing presented challenges. The flight tests and supporting simulations were carefully planned, and were to be conducted by making use of Design of Experiments to investigate the influence of factor effects on glide slope. The two factors …
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Autonomous landing system for a UAV
… UAV's ground station and the Autonomous Landing Flight Control Computer effectively. The second addresses the design and implementation of an autonomous landing controller using classical control techniques. Device drivers for the sensors and the communications protocol were developed in ANSI C. …
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Close Formation Flight Missions Using Vision-Based Position Detection System
<p>In this thesis, a formation flight architecture is described along with the implementation and evaluation of a state-of-the-art vision-based algorithm for solving the problem of estimating and tracking a leader vehicle within a close-formation configuration. A vision-based algorithm that uses …
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Automated ground maintenance and health management for autonomous unmanned aerial vehicles
… first fully-autonomous quadrotor UAV long-term flight tests and to conduct multi-UAV mission management research. In addition, this thesis describes, to the best of our knowledge, the first landing and recharge of a UAV on a mobile recharge platform.
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The Static Thrust Characterization of the Quatra Aerrow Q100XL Engine for Flight Performance Prediction of the 1/3-scaled Cessna 172P Model
… to predict the thrust as a function of forward flight velocity required for the one-third-scaled Cessna 172P. This model was designed to verify scaling laws. Therefore, it is important that it be aerodynamically scaled and that it have similar thrust characteristic as that of the full scale …
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