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 65 for “"control surfaces"”.
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Macro Fiber Composite Actuated Control Surfaces with Applications Toward Ducted Fan Vehicles
In most man-made flight, vehicle control is achieved by deflecting flaps. However, in nature, morphing surfaces are found on both flying and swimming creatures. Morphing is used in nature because it is a more efficient form of control. This thesis investigates using morphing flaps to control a …
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Hydrodynamic effects of leading-edge tubercles on control surfaces and in flapping foil propulsion
… a static foil, with application to conventional control surfaces--such as rudders or dive planes--found on marine vehicles. The second study uses a dynamic foil, with application to flapping foil propulsion. The lift and drag characteristics of foils with and without tubercles are compared using …
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Using control surfaces to evaluate weighting coefficients for fast thermo-fluid reduced-order-modelling strategies
… work explores the possibility of utilizing control surfaces to develop POD ROMs that can bypass the need to exploit the underlying governing equations with a view to evaluating their potential for fast thermo-fluid modelling in a forced, natural or mixed convection regime. The thesis …
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Implementation of Constrained Control Allocation Techniques Using an Aerodynamic Model of an F-15 Aircraft
Control Allocation as it pertains to aerospace vehicles, describes the way in which control surfaces on the outside of an aircraft are deflected when the pilot moves the control stick inside the cockpit. Previously, control allocation was performed by a series of cables and push rods, which …
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Active Flight Path Control for an Induced Spin Flight Termination System
In this thesis, we describe a method for controlling the cycle-averaged velocity direction of a fixed-wing aircraft in an unpowered, helical descent. While the aircraft propulsion system is disabled, either intentionally or due to a failure, the aerodynamic control surfaces (aileron, elevator, and …
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The contribution of the pectoral fins, body, and the ribbon fin to turning maneuvers of a gymnotiform swimmer
… complex environments. Fishes with traditional control surfaces primarily use body bending and pectoral fins to turn. However, little is known about how fishes with atypical control surfaces facilitate turning. This study investigated the weakly electric Black ghost knifefish (<em>Apteronotus …
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A novel optimised design using slots for flow control and high-lift performance of UCAVs
… of two flying wing planforms; second to control the flow by inserting leading-edge and chordwise slots and analysing the viscous flow development over the outboard sections of a flying-wing configuration to maximise the performance of control surfaces. The first part is demonstrated using …
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An integrated approach to the design of an aircraft gain scheduled controller
… parameters and of the corresponding feedback controller. The plant parameters are typically the sizes of the control surfaces or other aerodynamical surfaces of the aircraft. The approach is to rewrite the aircraft dynamic requirements as linear matrix inequalities (LMI's) and to optimize a …
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Design and Development of Stability and Control Systems for Small, Deployable Aircraft
… requirements present challenges in designing control surfaces with adequate stability and control performance. To satisfy the stowability requirements, the tail was designed with an oblique hinge in which the deployment axis doubles as the control-surface actuation axis. Actuation mechanics, …
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New Optimal-Control-Based Techniques for Midcourse Guidance of Gun-Launched Guided Projectiles
… is an exploration into the optimal guidance and control of gun-launched guided projectiles. Unlike their early counterparts, modern-day gun-launched projectiles are capable of considerable accuracy. This ability is enabled through the use of control surfaces, such as fins or wings, which allow …
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Suppression of limit cycle oscillations in an aeroelastic system using robust and adaptive control
In this thesis control systems are designed for the flutter control of nonlinear aeroelastic system. The aeroelastic model describes the plunge and pitch motion of a wing. The model includes plunge and pitch nonlinearities, and has both leading and trailing edge control surfaces for the purpose of …
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A Parametric Model for Predicting Submarine Dynamic Stability in Early Stage Design
… thesis is to develop a dynamic stability and control module that can be used in the concept exploration phase of design. The purpose of the module is to determine the hydrodynamic coefficients/derivatives and stability characteristics of a given design. Two tools, GEORGE and CEBAXI and LA_57, …
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Dual Mode Macro Fiber Composite-Actuated Morphing Tip Feathers for Controlling Small Unmanned Aircraft
… industry has become interested in alternative control surfaces and uses for smart materials. A Macro Fiber Composite (MFC), a smart material, takes advantage of the piezoelectric effect and provides an attractive alternative actuator to servos in the Small Unmanned Aerial Systems (SUAS) regime …
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Control Power Optimization using Artificial Intelligence for Hybrid Wing Body Aircraft
Traditional methods of control allocation optimization have shown difficulties in exploiting the full potential of controlling a large array of control surfaces. This research investigates the potential of employing artificial intelligence methods like neurocomputing to the control allocation …
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Investigation of adipose-derived mesenchymal stem cells interaction with electrospun demineralized bone matrix nanofiber scaffolds
… (ε-caprolactone) (PCL) scaffolds were used as control surfaces. Live cell stain calcein-AM and CellTiter 96® Non-Radioactive Cell Proliferation assays were used for cell adhesion and cell proliferation, respectively. DBM scaffolds supported greater cell adhesion compared to PCL nanofiber …
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On the development of computer code for aircraft flight dynamics analysis
… of three flight parameters if their aircraft control surfaces operated. These three flight parameters are the side slip angle β, the roll angle and the yaw angle . These three parameters describe the aptitude of the aircraft which can be obtained through solving the governing equation of …
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Design and manufacturing of a VTOL Micro Aerial Vehicle
… in a protective duct structure. Independent control of propeller pitch provides thrust and yaw control for the vehicle while in a hover mode. Translational control is provided by four independently actuated control surfaces which are placed in the area of high-speed flow aft of the propeller …
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Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles
… vehicles tend to be unstable and high frequency control is required to maintain steady flight. To provide high frequency control, aerodynamic control surfaces may need to be supplemented or replaced by high frequency actuators. Reaction control (RC) jets are an attractive solution, as they are …
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RESONANCE BASED LOW FREQUENCY SYNTHETIC JET ACTUATOR MODELING, DESIGN, AND TESING
… industry because of their ability to actively control flow over aerodynamic surfaces without discrete control surfaces such as a flap. One challenge has been to develop a low frequency, lightweight actuator that can provide large displacements. This study will discuss the modeling, design, …
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The Flying Fish, an untethered oceanographic sensor platform with acoustic homing capability
… An autopilot uses this information to actuate control surfaces and correct vehicle attitude. This thesis describes the oceanographic context in which the vehicle will be used, translates the scientific mission into a set of coherent engineering specifications, describes a prototype design that …
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