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 14 of 14 for “"ducted fan"”.
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Investigation of Control Effectors for Ducted Fan VTOL UAVs
Ducted fan VTOL UAVs are currently being designed for use by the Army for surveillance and reconnaissance in the battlefield. The vehicle tested in this research is part of the Honeywell MAV program. Able to be carried in a backpack by a single soldier, it has a duct diameter of 11.5-in. and weighs …
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Macro Fiber Composite Actuated Control Surfaces with Applications Toward Ducted Fan Vehicles
… flaps to control a class of UAVs known as ducted fan vehicles. Specifically, this thesis discusses both the challenges and benefits of using morphing control surfaces. To achieve morphing, a piezoelectric device known as Macro Fiber Composites is used. These devices are embedded in the skin …
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Instrumentation and Control of a Ducted Fan Unmanned Aerial Vehicle in Hover Mode
… to hold the position of the vehicle is desired. Ducted fan vehicles are of particular interest because of their high efficiency per unit diameter when compared to the more commonly seen multirotor vehicles. This makes ducted fan UAVs very well suited for size-constrained missions such as indoor …
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Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control
Ducted fan vehicles possess a superior ability to maximize payload capacity while minimizing vehicle size. Their ability to both hover and fly at high speed is a key advantage for information-gathering missions, particularly when close proximity to a target is essential. However, the ducted fan's …
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Effects of Aero-Propulsive Interactions for Various Wing Integration Techniques on Electric Ducted Fan Performance
… coupling effects of wing blended electric ducted fans (EDF) lifting systems over the EDF unit. Wing blended EDFs and isolated EDF are on the rise as a solution to increase efficiency on regional mobility platforms. Electrification of platforms has permitted the introduction of novel …
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Experimental and computational investigation of the transonic aero-propulsive interactions of an overwing ducted fan
The student, Matthew Lauer, submitted this Thesis for approval on 2021-04-21 at 15:17.
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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 …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
A series of experiments were conducted on a quasi-2D S8036 airfoil with a distributed electric propulsion (DEP) system. An overwing ducted fan system was tested with varied thrust angles achieved by deflecting the fan exit flow direction. The DEP system was comprised of five electric fans mounted …
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In-duct measurement techniques for the characterisation of broadband aeroengine noise
… of this thesis is the measurement of broadband fan noise, which due to reductions in tonal and jet noise, is now the dominant source at approach, and a major contributor at takeoff. This thesis proposes three new in-duct measurement techniques for the characterisation and measurement of …
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Scaled electromechanical modeling of the F-35A Joint Strike Fighter
… controlling the aerodynamic surfaces; high speed ducted fan motor for providing the necessary thrust, and LEDs to mimic the aircraft's external lighting system. Despite some minor differences in detail, the F-35A 25:1 scaled model closely resembled most of the physical features contained in the …
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Fundamental Studies of the Herschel-Quinke Tube Concept with Mode Measurements
… environment. A series of experiments was conducted at the NASA Langley Research Center 0.30 m ducted fan test facility where detailed modal measurements were performed. The main goals of this research endeavor were to evaluate the accuracy of the previously developed theoretical model and …
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Rotor Wakes; Formations, Interactions, and Design
… series of experimental campaigns involving both ducted and unducted rotors in static and advancing configurations. Advanced flow diagnostics tools, such as stereoscopic particle image velocimetry (stereo-PIV) to quantify the wake flow in the near-field and far-field, as well as surface pressure …
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Aerodynamic and Electromechanical Design, Modeling and Implementation Of Piezocomposite Airfoils
… and successfully implemented on an experimental ducted-fan vehicle. A custom, fully automated low-speed wind tunnel and a load balance is designed and fabricated for experimental validation. The airfoils are evaluated in the wind tunnel for their two-dimensional lift and drag coefficients at low …