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.
Results
Showing 1 to 20 of 47 for “"fixed-wing aircraft"”.
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Towards Practical Fixed-Wing Aircraft with Electroaerodynamic Propulsion
… almost silent; they may therefore be useful for aircraft propulsion in applications where silence is valuable. Previous research has shown that EAD for fixed-wing, heavier-than-air aircraft propulsion is feasible. The goal of this thesis is to determine whether a fixed-wing EAD aircraft can be …
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Electro-aerodynamic thrust for fixed-wing aircraft propulsion
… EAD propulsion has yet to be implemented in fixed-wing aircraft, in part due to the limited understanding of EAD thruster performance. The objective of this thesis is to determine the feasibility and viability of EAD propulsion in fixed-wing aircraft applications. This thesis begins with a …
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Agile flight control techniques for a fixed-wing aircraft
… surveillance or fly-by reconnaissance. Fixed-wing vehicles with a high thrust-to-weight ratio are capable of performing maneuvers such as take-off or perch style landing and switch between hover and conventional flight modes. Agile flight controllers enable a single vehicle to achieve …
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The development of a fixed wing aircraft analysis and design flight dynamic software
… analysis and controlling the behavior of a fixed-wing aircraft. For a given aircraft geometry, mass and inertia properties, and flight conditions, the software was designed in such a way to start the estimation of aerodynamic characteristics, trimmed flight, stability analysis through …
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Autonomous Flight Arcade: Reinforcement Learning for End-to-End Control of Fixed-Wing Aircraft
… of robust environments for end-to-end control of fixed-wing aircraft and quadcopter drones. These environments are playable by both humans and artificial agents, making them useful for varied tasks including reinforcement learning, imitation learning, and human experiments. Additionally, we show …
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Longitudinal stability and control analysis and parameter sensitivity investigation of fixed wing aircraft in ground proximity using various aerodynamic approaches
… of the stability of longitudinal motion of fixed wing aircraft in ground proximity presented here focuses on rectangular wing and tail configurations similar to that of the Piper Cherokee PA-28-180. The majority of our results pertain to the height range down to one quarter of the wing span, …
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Passivity-Based Control of Small Unmanned Aerial Systems
… control law that stabilizes the motion of an aircraft with a large region of attraction. {color{black} The energy-based control scheme is applied to both multirotor and fixed-wing aircraft}. Multirotor aircraft dynamics are cast into a port-Hamiltonian System and the concept of trajectory …
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Vision-Based Self-Motion Estimation in a Fixed-Wing Aerial Vehicle
… a complete algorithm to estimate the motion of a fixed-wing aircraft given a series of digitized flight images. The algorithm was designed for fixed-wing aircraft because carefully procured flight images and corresponding navigation data were available to us for testing. After image …
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Identification of Unsteady Flight Dynamic Models and Model-based Wind Estimation with Flight Test Validation
… boundary layer (ABL). Small, low-cost, uncrewed aircraft (drones) can be used to measure wind and a distribution of these vehicles could potentially provide measurements with much greater density and resolution, in both space and time, than current methods allow. To measure wind, a drone could be …
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Augmented Propeller Design with the use of a Passive Circulation Control Pressurization System
… control is a high-lift device used on the main wing of an aircraft. This technology has been in the research and development phase for over sixty years primarily for fixed-wing aircraft when the early models were referred to as "blown flaps." Circulation control works by increasing the near …
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Online Aircraft System Identification Using a Novel Parameter Informed Reinforcement Learning Method
… learning neural networks for online aircraft system identification of multiple similar linear systems, such as all fixed wing aircraft. This approach, termed Parameter Informed Reinforcement Learning (PIRL), dictates that reinforcement learning neural networks should be trained using …
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A Study of Morphing Wing Effectiveness in Fighter Aircraft using Exergy Analysis and Global Optimization Techniques
… synthesis/design of an Air-to-Air Fighter (AAF) aircraft with and without wing-morphing capability. In particular, a morphing-wing AAF is compared to a traditional fixed-wing AAF by applying large-scale optimization using exergy- and energy-based objective functions to the synthesis/design and …
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An assessment of electric STOL aircraft
… which enable new vehicle configurations by allowing the efficient distribution of many smaller propulsors around the airframe. One application of this technology is to greatly enhance the short takeoff and landing (STOL) capability of a fixed-wing aircraft. STOL aircraft may have advantages over …
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Active Flight Path Control for an Induced Spin Flight Termination System
… the cycle-averaged velocity direction of a fixed-wing aircraft in an unpowered, helical descent. While the aircraft propulsion system is disabled, either intentionally or due to a failure, the aerodynamic control surfaces (aileron, elevator, and rudder) are assumed to be functional. Our …
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Linear Parameter Varying Path Following Control of a Small Fixed Wing Unmanned Aerial Vehicle
A mathematical model of a small fixed-wing aircraft was developed through application of parameter estimation techniques to simulated flight test data. Multiple controllers were devised based on this model for path following, including a self-scheduled linear parameter-varying (LPV) controller with …
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Structure-Inspired Disturbance Observer Design and Disturbance Observer-Based Control/estimation
… are supported by three application examples---a fixed-wing aircraft, an underwater vehicle, and a Furuta pendulum.
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Modeling and Simulation of Vehicle Performance in a UAV Swarm Using Horizon Simulation Framework
… a simplified model of the MQ-1 Predator, a large fixed-wing aircraft. The simulated swarm utilizes a decentralized cooperative control approach to command the assets through the use of digital pheromones and a pheromone map. Each vehicle operates at steady-state flight conditions of 36 m/s with an …
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Implementation of mechanical, electrical, and feedback control systems in unmanned aerial vehicles
… that was capable of stable, autonomous flight. A fixed wing aircraft was chosen to simplify some of the flight characteristics and avoid some of the challenges found in rotary wing machines. Two aircraft were tested: a large and heavy gasoline powered aircraft and a smaller and much lighter …
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Multi-modal motion planning using composite pose graph optimization
… using a vertical take-off and landing (VTOL) fixed-wing aircraft that can transition between hover and horizontal flight modes.
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A computational approach to display layout analysis
… flew an instrument flight simulation of a light fixed-wing aircraft, performing various flight control and systems monitoring tasks. Both qualitative (subjective) and computational (objective) assessments were made as to the adherence of each display condition to each of the three display layout …
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