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Showing 1 to 16 of 16 for “"VTOL aircraft"”.
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Conceptual Design Methodology for the Fan-in-Wing VTOL Aircraft
<p>The Fan-In-Wing (FIW) aircraft concept is one 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 …
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A Numerical Vortex Approach To Aerodynamic Modeling of SUAV/VTOL Aircraft
… of tail-sitter vertical take-off and landing (VTOL) aircraft, where the propeller slipstream is the primary source of air flow past the wings in some flight conditions. The algorithm is presented, and results compared with published experimental data.
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A Framework of a Power Management System for a Hybrid Electric VTOL Aircraft using Optimal Control
… takeoff and landing unmanned aerial vehicle (VTOL UAV) is assessed using an optimal control framework for the most energy-efficient and time-efficient trajectories. The UAV is equipped with a modular hybrid propulsion system (MHPS) where the electrical and carbon-fuel system components are …
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Heat Transfer Assessment of Aluminum Alloy Corrugated Naval Ship Deck Panels under VTOL Aircraft Thermal Loads
… thermal loads of Vertical Take-off-and Landing (VTOL) capable aircraft has become a question of interest with the introduction of new primarily aluminum alloy ships to the U.S. Naval Fleet. This study seeks to provide an initial investigation of this question by examining the transient transfer …
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… 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 moments are inextricably linked to power input.</p> <p>This effort begins by characterizing …
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Multilevel Buck Converter Topologies and Their Applications
… relatively low-current application, such as E-VTOL aircraft is proposed. Flying capacitor multilevel buck topology with soft-switching operation is utilized to achieve high efficiency, light weight, and lower EMI. In case II, a modular series capacitor buck topology for high-current, low duty …
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The Futures of Flight
… The emergence of Vertical Takeoff and Landing (VTOL) aircraft, however, represents one potential future with the opportunity to enhance the human relationship with flight. This thesis proposes a regional infrastructure system of ‘skyports’ to support VTOL within the state of Washington. One …
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Comparative Evaluation of Propulsive Power Transmission Technologies for High-Speed Vertical Takeoff and Landing (HSVTOL) Cargo Aircraft
… 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 by …
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Development of a Novel Probe for Engine Ingestion Sampling in Parallel With Initial Developments of a High-speed Particle-laden Jet
… for turbine 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 …
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Development of Diagnostic Tools for Use in a Gas Turbine Engine Undergoing Solid Particulate Ingestion
Aircraft propulsion systems can be exposed to a variety of solid particulates while operating in either arid or 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. …
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The Use of System Theoretic Process Analysis (STPA) onNovel Tiltrotor Aircraft to Prevent Mode Confusion
… tiltrotor and vertical take-off and lift (VTOL) aircraft that enhance commercial and military aviation’s autonomy, capability, and survivability. These designs integrate rotary and fixed-wing elements, introducing distinct safety considerations. These safety concerns are largely due to the …
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In-Flight Learning Based Flight Control of an Unmanned Aircraft System
… A composite mission also requires the aircraft to be able to hover or operate with low cruise speeds for applications involving stationary moments. All of these different operational modes require a hybrid aircraft design that combines fixed wing aircraft capabilities and Vertical …
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Modeling and Control of Dual-Motored Tail-Sitting Flying Wing Using a Fuzzy Logic Pid Controller
… The hybrid vertical take-off and landing, VTOL, UAV is one aircraft that presents a potential solution to the classic trade-off of the traditional VTOL's range and endurance limitations versus the fixed wing's required infrastructure. An aircraft known as the Flite Test Spear is used to …
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Land based air power or aircraft carriers? The British debate about maritime air power in the 1960s
… projects as the TSR.2 and F.111, prospective VTOL aircraft and not least the CVA-01 fleet carrier, but most of all it focuses on the issue of military strategy. The rivalry between the Royal Navy and the Royal Air Force was largely about the questions of carrier aviation versus land-based air …
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Transitions Between Hover and Level Flight for a Tailsitter UAV
<p>Vertical Take-Off and Land (VTOL) Unmanned Air Vehicles (UAVs) possess several desirable characteristics, such as being able to hover and take-off or land in confined areas. One type of VTOL airframe, the tailsitter, has all of these advantages, as well as being able to fly in the more …