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 39 for “"vertical take-off and landing"”.
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Viability of Cross-Flow Fan for Vertical Take-Off and Landing Aircraft
… a housing design that, when paired with an off-the-shelf cross-flow fan rotor, will generate a trust-to-weight ratio significant enough to allow for vertical take-off. The commercial computational fluid dynamics software, ANSYS CFX, was used to perform a computational analysis of various …
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Vertical Take-Off and Landing Control via Dual-Quaternions and Sliding Mode
<p>The landing and reusability of space vehicles is one of the driving forces into renewed interest in space utilization. For missions to planetary surfaces, this soft landing has been most commonly accomplished with parachutes. However, in spite of their simplicity, they are susceptible to …
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Concept Study of a High-Speed, Vertical Take-Off and Landing Aircraft
… the features of a retractable rotor system for vertical take-off and landing (VTOL) with an integral, circular wing for high-speed flight. Tests were conducted to generate basic aerodynamic characteristics of the DiscRotor in hover and in fixed-wing flight. To assess the DiscRotor during hover, …
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Design of an automatic landing system for twin rotor vertical take-off and landing unmanned air vehicle
With the release of Bombardier's new vertical take-off and landing unmanned air vehicle (VTOL UAV), the company's design team were interested in exploring new ideas for automatically landing the craft. Bombardier established guidelines and limitations on performance in order to ensure the safety of …
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Numerical Modeling of Synthetic Vortical Disturbance Interactions Using OpenFOAM
… the number of Advance Air Mobility (AAM) Electic Vertical Take-off and Landing (eVTOL) concepts is rapidly increasing due to their capability of vertical take-off and landing at vertiports located on rooftops of tall urban buildings, which does not require using the ground space in a condensed …
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A Numerical Vortex Approach To Aerodynamic Modeling of SUAV/VTOL Aircraft
A combined wing and propeller model is presented as a low-cost approach to preliminary modeling of slipstream effects on a finite wing. The wing aerodynamic model employs a numerical lifting-line method utilizing the 3D vortex lifting law along with known 2D airfoil data to predict the lift …
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A Multi-modal Robot for Ground and Aerial Locomotion
This thesis describes the design and testing of a quadcopter that capable of both driving and flying. This was achieved by mounting quadcopter motors and propellers to the center of each of the robot's four wheels. The wheels are then capable of changing orientation in order to allow the robot to …
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Aggressive landing maneuvers for unmanned aerial vehicles
VTOL (Vertical Take Off and Landing) vehicle landing is considered to be a critically difficult task for both land, marine, and urban operations. This thesis describes one possible control approach to enable landing of unmanned aircraft systems at all attitudes, including against walls and ceilings …
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System identification for development of distributed electric propulsion vertical take-off vehicles
… estimating the inertia matrix of a multi-rotor vertical take-off and landing vehicle. The procedure starts with an overview of vehicle dynamics. An estimator and a controller are introduced based on these dynamics, which can be tuned to the desired performance specifications. Once the vehicle is …
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Multi-modal motion planning using composite pose graph optimization
… transcribing cost function, vehicle dynamics, and state and control constraints into a sparse factor graph is introduced. By formulating the motion planning problem in pose graph form, the motion planning problem can be addressed using efficient optimization techniques, similar to those already …
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Instrumentation and Control of a Ducted Fan Unmanned Aerial Vehicle in Hover Mode
… are increasingly being used for both military and commercial applications to replace more costly and dangerous manned operations. Vehicles with vertical take-off and landing (VTOL) and hovering capabilities are of interest for functions such as surveillance and inspection where the ability to …
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Motion Coordination of Aerial Vehicles
… attitude synchronization of rigid bodies and the formation control of Unmanned Aerial Vehicles (UAVs) capable of Vertical Take-Off and Landing (VTOL). The information flow between members of the team is assumed fixed and undirected. The first part of this thesis is devoted to the attitude …
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Key-Based Authentication Scheme for eVTOL Drones Using Chebyshev Chaotic Maps
<p>The development of electric Vertical Take-Off and Landing (eVTOL) drones signifies a substantial advancement in urban air mobility, ready to transform transportation models in densely populated regions. These advanced drones, distinguished by their capacity to function in limited spaces and …
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Development of a Miniature VTOL Tail-Sitter Unmanned Aerial Vehicle
The design, analysis, construction and flight testing of a miniature Vertical Take-Off and Landing (VTOL) tail-sitter Unmanned Aerial Vehicle (UAV) prototype is presented in detail. Classic aircraft design methods were combined with numerical analysis to estimate the aircraft performance and flight …
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Market Mechanisms for Service Provider Operations in Advanced Air Mobility
… air mobility (AAM) flights in the form of vertical take-off and landing aircraft (VTOL) and uncrewed aircraft systems (UAS) in the near future will require a new air traffic management system adapted for on-demand flights flying at low altitudes and far from existing airports and aviation …
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Algorithms for Generation and Tracking of Fast and Agile Flight Trajectories
… applications. It requires motion planning and flight control algorithms that enable highly accurate maneuvering at the edge of the vehicle’s capability. These algorithms must overcome challenges particular to fast and agile flight, such as complex dynamics effects including significant …
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Adaptive Control of the Transition from Vertical to Horizontal Flight Regime of a Quad-Tailsitter UAV
… (Unmanned Aerial Vehicles) are a type of VTOL (Vertical Take off and Landing) aircraft that combines the agility of a quadrotor drone with the endurance and speed of a fixed-wing aircraft. For this reason, they have become popular in a wide range of applications from tactical surveillance to …
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3-D Point Cloud Generation from Rigid and Flexible Stereo Vision Systems
… Unmanned Ground Vehicle (UGV), such problems as landing site estimation or robot path planning become a concern. Deciding if an area of terrain has a level enough slope and a wide enough area to land a Vertical Take Off and Landing (VTOL) UAV or if an area of terrain is traversable by a ground …
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