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 28 for “"Vertical Takeoff and Landing"”.
-
Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… explores the interactions between aerodynamics and hybridelectric power system (HEPS) design and control for vertical takeoff and landing (VTOL) aircraft applications. Specifically, this research focuses on embedded distributed electric propulsion systems, for which the aerodynamic forces and …
-
Comparative Evaluation of Propulsive Power Transmission Technologies for High-Speed Vertical Takeoff and Landing (HSVTOL) Cargo Aircraft
<p>Designing High-Speed Vertical Takeoff and Landing (HSVTOL) cargo aircraft capable of both low downwash velocity hovering and high subsonic speed cruising presents a significant engineering challenge. This challenge, stemming from conflicting design requirements, has been substantially influenced …
-
ROBUST CONTROL OF AN EVTOL THROUGH TRANSITION WITH A GAIN SCHEDULING LQR CONTROLLER
The advancements in electric motor propulsion and battery technologies have made the implementation of electric power in aerial transportation increasingly feasible. As such, the interest and development of electric vertical takeoff and landing (eVTOL) aircraft has become a greater portion of the …
-
The Futures of Flight
This thesis contends that imagination and visions of the future have been present throughout the history of human flight. Events of the past have continuously changed perceptions of possibility in flight and have subsequently expanded the limits of imagination. As these limits expand a number of …
-
Some tracking problems for aerospace models with input constraints
… design problems for key models of planar vertical takeoff and landing (PVTOL) aircraft and unmanned air vehicles (UAVs). The novelty of our PVTOL work is the global boundedness of our controllers in the decoupled coordinates, the positive uniform lower bound on the thrust controller, the …
-
Multidisciplinary design optimization of an eVTOL aircraft using analytical target cascading
… designed subcomponents via coupled analysis and design. In this work, a hierarchical decomposition approach is introduced for the integration of preliminary sizing as well as various component level design and optimization models of a fully electric vertical takeoff and landing (eVTOL) …
-
Elevating the future of urban mobility autonomous passenger drones design
… the rapid development of technology in markets and industries, public focus has moved to the economic and social impacts that unmanned aerial vehicles (UAVs) may bring. Many technology companies have revealed their plans to launch electric vertical takeoff and landing aircraft (VTOLs) and …
-
Optimizing Urban Air Mobility Operations in a Corridor Network
Electric vertical-takeoff-and-landing vehicles give rise to Urban Air Mobility (UAM) concepts. Initial UAM systems are projected to operate high volumes of flights within a capacitated corridor network. This paper develops a tractable methodology to optimize vehicle dispatching and routing in UAM …
-
Robust Optimal Control of a Tailsitter UAV
Vertical Takeoff and Landing (VTOL) Unmanned Aerial Vehicles (UAVs) possess several beneficial attributes, including requiring minimal space to takeoff, hover, and land. The tailsitter is a type of VTOL airframe that combines the benefits of VTOL capability with the ability to achieve efficient …
-
Automated Landing Site Evaluation for Semi-Autonomous Unmanned Aerial Vehicles
… is described for identifying obstacle-free landing sites for a vertical-takeoff-and-landing (VTOL) semi-autonomous unmanned aerial vehicle (UAV) from point cloud data obtained from a stereo vision system. The relatively inexpensive, commercially available Bumblebee stereo vision camera was …
-
DESIGN OF AVIONICS AND CONTROLLERS FOR AUTONOMOUS TAKEOFF, HOVER AND LANDING OF A MINI-TANDEM HELICOPTER
… autonomy is an active research area these days and promises very useful applications. A lot of research has been carried out on Vertical Takeoff and Landing (VTOL) vehicles especially single rotor small scale helicopters. This thesis focuses on a small scale twin rotor helicopter. These …
-
Conceptual Design Methodology for the Fan-in-Wing VTOL Aircraft
… of the most compelling solutions for missions demanding jet-like cruise speeds and Vertical TakeOff and Landing (VTOL) capability. However, despite years of interest and documented improvements in lift-fan technology, there exists little in the way of an adequate theory for conceptual design of a …
-
Adaptive Control Techniques for Transition-to-Hover Flight of Fixed-Wing UAVs
… with the ability to hover combine the speed and endurance of traditional fixed-wing fight with the stable hovering and vertical takeoff and landing (VTOL) capabilities of helicopters and quadrotors. This combination of abilities can provide strategic advantages for UAV operators, especially …
-
Urban Air Mobility (UAM) Landing Site Feasibility Analysis: A Multi-Attribute Decision Making Approach
This thesis presents methods to place landing sites for the Urban Air Mobility (UAM) concept. The analysis shows an integrated approach to establish UAM landing site requirements, place landing sites based on predicted demand, and estimate the costs associated with UAM landing sites. This thesis …
-
Development of a Novel Probe for Engine Ingestion Sampling in Parallel With Initial Developments of a High-speed Particle-laden Jet
… engines, specifically those in aircraft. Sand and related particles tend to become suspended in air, posing an omnipresent health threat to engine components. This issue is most prevalent during operation in sandy environments at low altitudes. Takeoffs and landings can blow a significant …
-
Development of Diagnostic Tools for Use in a Gas Turbine Engine Undergoing Solid Particulate Ingestion
… other hazardous environments. For conventional takeoff and landing aircraft, debris can be ingested directly into the gas turbine powerplant which is exposed to the ambient environment. For helicopters and other vertical takeoff and landing (VTOL) aircraft, rotor down wash presents a particular …
-
Aerodynamic study of a small, ducted VTOL aerial vehicle
… Vehicle (PUAV) is a 9-inch diameter ducted vertical takeoff and landing reconnaissance vehicle with the capability of fast-forward cruise flight. Currently in the development stage, the program is envisaged to yield a man-portable craft that a foot soldier can use to provide over-the-hill …
-
Effects of Duct Lip Shaping and Various Control Devices on the Hover and Forward Flight Performance of Ducted Fan UAVs
The military's desire for ducted fan vertical takeoff and landing (VTOL) unmanned aerial vehicles (UAVs) stems from the vehicles' relatively small size, safety in tight quarters, increased payload capacity for their size, and their ability to hover for surveillance missions. However, undesirable …
-
Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
Small unmanned aircraft and electric vertical takeoff and landing (eVTOL) aircraft have recently emerged as vehicles able to perform new missions and stimulate future air transportation methods. This dissertation presents several system identification research advancements for these modern aircraft …
-
Investigation of the Aerodynamic and Acoustic Performance of a Scaled eVTOL Propeller in Axial and Non-Axial Flight
… adherence to noise emission regulations and general public acceptance. With the design of new and innovative air vehicles utilizing electric Vertical Takeoff and Landing (eVTOL) propulsion systems for UAM applications, significant gaps remain in the understanding of their aerodynamic and …
Page 1 of 2