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 18 of 18 for “"aerodynamic forces and moments"”.
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Aerodynamic stability analysis of a CubeSat in high-speed rarefied flow
Small satellites, such as CubeSats and SmallSats, are seeing increased use in Low Earth Orbit, particularly at altitudes with measurable aerodynamic effects. It is important to design these spacecraft, which often have modest control authority, such that the resultant aerodynamic forces and moments …
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An experimental study of the relationship between forces and moments and vortex breakdown on a pitching delta wing
… leading-edge delta wing model at both static and dynamic conditions at a Reynolds number of 1.43 $\times$ 10$\sp6$. Large amplitude oscillatory motions were produced by sinusoidally pitching the model over a range of reduced frequencies. Ramp motions were obtained using an initial sinusoidal …
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A model of quadrotor UAV power consumption and its performance across a range of flight conditions
… parametric model of quadrotor power consumption and characterizes the performance of this model in hardware experiments. Like other existing power models that have been used both for quadrotors and general rotorcraft, it can be expressed as the sum of four terms---induced, parasitic, profile, and …
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An experimental investigation of oblique wing static aeroelastic phenomena
… tunnel tests were conducted to determine the aerodynamic forces and moments produced by several clamped oblique wings. The wing sweep and aileron deflection angles were varied throughout a wide range of dynamic pressures. The wing structure was also stiffened. Strains were measured in the …
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Aerodynamic Properties of the Inboard Wing Concept
… in airliner configurations from an experimental aerodynamics point of view. The concept proposes mounting the fuselages at the tips of a low aspect ratio wing. The motivation for this configuration is to provide an increase in the number of passengers carried with no increase in span over …
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Dynamic control of aerodynamic forces on a moving platform using active flow control
The unsteady interaction between trailing edge aerodynamic flow control and airfoil motion in pitch and plunge is investigated in wind tunnel experiments using a two degree-of-freedom traverse which enables application of time-dependent external torque and forces by servo motors. The global …
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Aerodynamic Modeling Using Computational Fluid Dynamics and Sensitivity Equations
A mathematical model for the determination of the aerodynamic forces acting on an aircraft is presented. The mathematical model is based on the generalization of the idea of aerodynamically steady motions. One important use of these results is the determination of steady (time-invariant) …
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Control of cooperative unmanned aerial vehicles
This thesis addresses the problems of design and control of small cooperative unmanned autonomous quadrotor aerial vehicles. A new approach is proposed, for the modeling of the system’s dynamics using linearized Piecewise AffineModels. The Piecewise Affine dynamic–models cover a large part of the …
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Low-Speed Flight Testing and System Identification of a Small-Scale Supersonic Uncrewed Aerial Vehicle
… supersonic uncrewed aerial vehicle (SSUAV) aerodynamics using novel, air-breathing propulsion. Continued MUFASA development relies on a lightweight, downsized demonstrator possessing satisfactory low-speed stability and control characteristics. Following an iterative prototype development …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
… sized with a diameter-to-chord ratio of 19.7%, and five fans were installed to cover 70.3% of the airfoil model span. Aerodynamic forces and moments were recorded for the airfoil in a static condition, as well as across a range of Reynolds numbers, angles of attack, tip speed ratios, and nozzle …
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Three-dimensional nonequilibrium viscous shock-layer flows over complex reentry vehicles
… flows over blunt spherecones, straight. and bent mul ticonics at angle-of-attack has been developed. The method used is the viscous shock-layer approach- for nonequilibrium, multi-component ionizing air. A seven species chemical reaction model with single ionizing species and an eleven …
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Integrating supplemental lift devices to improve performance in high speed multi rotor UAVs
… generally aft of the vehicle’s center of gravity and lacking control surfaces, into high-speed multi-rotor UAVs. The goal is to improve flight performance across the diverse range of mission profiles these platforms typically encounter. Multi-rotor platforms are traditionally constrained by the …
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… effort 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 …
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An experimental and computational aerodynamic investigation of a low-canard high-wing aircraft design
An experimental and computational investigation of a low-canard high-wing aircraft design has been conducted. The aircraft studied has a canard and wing of similar chord and airfoil section. The canard is approximately half the span of the main wing and both surfaces are untwisted and unswept. …
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Aeroservoelastisches Modell zur Beschreibung der instationären Aerodynamik für nichtlineare beliebige Eingangsgrößen im Zeitbereich
… suppression. The response of the unsteady aerodynamics and the system behav-iour with respect to a non-linear time dependent doublet deflection of the rudder and the angle of attack are calculated. An integrated areoservoelastic model in time domain is set up by means of the indicial …
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From Oscillating Flat Plate to Maneuvering Bat Flight – Role of Kinematics, Aerodynamics, and Inertia
With the aim to understand the synergistic roles played by kinematics, aerodynamics, and inertia in flapping wing maneuvers, this thesis first investigates the plunging motion of a simple flat plate as it is a fundamental motion in the kinematics of many flying animals. A wide range of frequency …
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Ein modulares Verfahren für die numerische aeroelastische Analyse von Luftfahrzeugen
In order to assure economic efficiency and operational safety of new aircrafts, it is necessary to accurately consider the interaction of the elastic aircraft structure and the airflow in early stages of design. For a reliable prediction of effects arising from the interaction of the fluid and the …
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Comparison of Strain Gage and Fiber Optic Sensors On A Sting Balance In A Supersonic Wind Tunnel
Force and moment balances have proved to be essential in the measurement and calculation of aerodynamic properties during wind tunnel testing. With the recent advancements of technology, new fiber optic sensors have been designed to replace the conventional foil strain gage sensors commonly found …