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 16 of 16 for “"Aerodynamic control"”.
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Aerodynamic control of a vehicle with flexible longitudinal mode
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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The aerodynamic control of the v-type vertical axis wind turbine
… is of simple design and construction, has a low aerodynamic efficiency, yet its originators consider that it will be a cost effective configuration in electricity generation applications. However, the quality and reliability of its power output must be ensured; this necessarily requires continual …
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Actuator-Work Concepts Applied to Morphing and Conventional Aerodynamic Control Devices
… parameter for the comparison of various aerodynamic control device configurations. This estimated "actuator work," or practical work as it will be referred to as in this thesis, is based on the aerodynamic and structural resistance to a control surface deflection. It is meant to represent …
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Design synthesis of NLMPC-based tracking controller for autonomous vehicles with active aerodynamic control
… have witnessed extensive studies on tracking-control for autonomous vehicles (AVs). However, there is a lack of studies on effective design methods in this field. To tackle this problem, this thesis proposes a design synthesis method which is featured a design framework with two layers: at the …
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Design and analysis of active aerodynamic control systems for increasing the safety of high-speed road vehicles
… downforce can be generated by employing aerodynamic wings on the vehicle body to enhance its road holding ability. A split rear wing is proposed to control the aerodynamics of high-speed road vehicles to closely manipulate the dynamics of the vehicle. A nonlinear vehicle model is derived …
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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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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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Analysis and design of propulsive guidance for atmospheric skip entry trajectories
… of NASA's Crew Exploration Vehicle. The primary aerodynamic guidance system must execute an atmospheric skip maneuver when attempting to reach distant landing sites. These maneuvers result in the loss of aerodynamic control authority during the skip phase. The physics of the problem were studied …
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Aerodynamic Flow Control through Adapted Leading Edge Enabled by Pneumatic Artificial Muscle Actuators
<p>This thesis investigates a novel method for aerodynamic flow control at the wing–body junction through the use of a morphing leading-edge fairing actuated by pneumatic artificial muscles (PAMs). The compliant fairing, cast from Ecoflex® 00–31 silicone and embedded with a McKibben-type PAM …
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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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Adaptive Control of an Aeroelastic System for Active Flutter Suppression and Disturbance Rejection
… aircraft design strives for lighter weight, more aerodynamically efficient structures. These improvements may come with the drawback of increased structural flexibility and elevated aeroelastic effects, often resulting in a lower flutter speed. This motivates the implementation of advanced control …
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A Simplified Icing Model for Simulation and Analysis of Dynamic Effects
Ice accretions on aerodynamic surfaces are a major concern during flight. In this research effort, glaze ice is being modeled and its effects on aircraft dynamics analyzed. This type of ice builds up as a clear layer on aerodynamic surfaces and other components such as antennas and intakes. Glaze …
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Neuroinspired control strategies with applications to flapping flight
… simulation, and experimental study of control strategies which are inspired by biological systems. Biological systems, along with sufficiently complicated engineered systems, often have many interacting degrees of freedom and need to excite large-displacement oscillations in order to …
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Performance assessment of Mars entry systems with flap-based trajectory control
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-14 without embargo terms