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.
Results
Showing 1 to 20 of 272 for “"yaw"”.
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Robust Yaw/roll Control of High-Speed Containerships
… for high-speed containerships with aggravated yaw/roll characteristics. With the trend of higher superstructures, low density cargo, and the deck loading of containerships, major problems have arisen in regard to roll motion stabilization. To minimize the yaw/roll coupling effect on the …
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Incremental adaptation to yaw head movements during 30 RPM centrifugation
… the Man Vehicle Lab have studied adaptation to yaw head movements while rotating at 23 RPM. To investigate adaptation to head movements at a higher rotation rate, 28 subjects participated in a 3-Day protocol in which centrifuge velocity was incremented from 14 RPM on Day 1, to 23 RPM on Day 2, …
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Relative effects of roll and yaw motion cues in manual control.
Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics. Thesis. 1968. M.S.
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Bio-inspired pressure sensing for active yaw control of underwater vehicles
… active detection and correction of the vehicle's yaw angle. Preliminary experiments demonstrate that a low number of sensors are sufficient to enable the discrimination between different orientations, and that a basic proportional controller is capable of keeping the vehicle aligned with the …
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The Influence of Yaw and Coning on Small Bio-Inspired Wind Turbines
… The study also investigates the effect of yaw on the small wind turbine models for yaw angles (γ) of 10◦ and 20◦. Power coefficient measurements revealed that coning had a more pronounced effect on the turbine model in yawed inflows than in zero-yaw. Rotor with β = 15◦ had a 14% higher …
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A probe to measure stagnation pressure, static pressure, yaw and pitch angle
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1958.
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Prototype development and testing of active yaw moment control system using vehicle momentum wheel
… and active research topic nowadays. Active yaw moment control to improve vehicle’s handling and stability has been chosen as the control strategy. This technique uses a momentum wheel control (MWC) independent of the tire/road interaction to generate the corrective yaw moment. A fully …
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Eight Degree of Freedom Vehicle Model with Pitch, Yaw, Tire Control and Sensor Inputs
<p>This research focuses on the development of an eight degree of freedom vehicle model in the MATLAB computing language. Its purpose is to provide flexibility in the modeling and implementation of signal inputs and crash avoidance logic while maintaining accuracy in the physics of the vehicle’s …
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Measurement Drift in 3-Hole Yaw Pressure Probes From 5 Micron Sand Fouling at 1050° C
… of accurately measuring flow angles in the yaw plane. These probes can be utilized inside a jet engine hot section for diagnostics and flow characterization. Sand and other particulate pose a significant risk to hot section components and measurement devices in gas turbine engines. The …
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Design and Evaluation of an Active Yaw and Turbulence Generation System to Produce Unsteady Flow in Automotive Wind Tunnels
… development, and testing of a novel unsteady yaw and turbulence generation system (TGS) for automotive wind tunnels that replicates on-road conditions using three combined subsystems. The focus of this thesis is primarily on one of the TGS subsystems, the unsteady yaw generation subsystem, …
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Roll and Yaw Stability Evaluation of Class 8 Trucks with Single and Dual Trailers in Low- and High-speed Driving Conditions
A comprehensive evaluation of roll and yaw stability of tractor/semitrailers with single and dual trailers in city and highway conditions is conducted. Commercial vehicles fundamentally behave differently in city driving conditions than at high speeds during highway driving conditions. In order to …
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Skin Friction and Cross-flow Separation on an Ellipsoidal Body During Constant Yaw Turns and a Pitch-up Maneuver with Roll Oscillation
… (non-BOR) ellipsoidal model performing constant-yaw turns and a pitch-up maneuver, each with roll oscillation were studied for the first time. The detailed, low uncertainty, flow topology data provide an extensive experimental database on the flow over non-BOR hull shapes that does not exist …
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Global Estimation Methodology for Wave Adaptation Modular Vessel Dynamics Using a Genetic Algorithm
… The model has been optimized using a “No Surge-Yaw” model (minimal surge coupling) and a “Full” model (all states have coupling effects to each other) to determine how well each model can be estimated. The “No Surge-Yaw” model had the best results with making a working marine vessel model. The …
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Experimental and computational investigation of helium injection into air at supersonic and hypersonic speeds
… models at different injector transverse and yaw angles in order to determine the mixing rate and core penetration of the injectant and the flow field total pressure losses. when gaseous injection occurs into a supersonic freestream. Tested in the Virginia Tech supersonic tunnel. with a …
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Propellers in yawed flow at low speeds
… at low Reynolds numbers, nor their behavior in yaw are clearly known. Knowledge of the aerodynamic characteristics of these propellers is instrumental in providing an appropriate propulsion system. The goal behind this thesis is to evaluate the performance of several propellers at multiple …
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The dynamics of the human head during natural activities that require clear vision
… MEMs based angular velocity sensors to track the yaw and pitch velocities of the head and the trunk. Subjects were tested under experimental conditions that required them to 1) simultaneously walk or run, and visually track and catch a moving ball, 2) walk or run without being given a defined …
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Dynamic wind turbine wake trajectory control: Strategies and real-time validation
… demonstrated power production enhancements using yaw-based wake steering. However, slower yaw actuation rates compared to inflow change rate cause time-varying downstream-rotor-wake overlap conditions, diminishing its benefits. To accommodate for inflow variations, closed-loop wake control can be …
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Lateral Tracking and Stability Control for Automated Vehicles
… is proposed and used in the design of direct yaw moment control. This thesis solves the problem of optimal usage of tire traction in the application of vehicle stability control by using the 2-D Modified LuGre tire model. Since the model captures 2-D tire friction force distribution …
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Regulator control of a short-radius centrifuge and subjective responses to head movements in a rotating environment
… changes induced by head movements in both the yaw and pitch planes while supine during centrifugation. Yaw right, yaw left, and pitch head movements yielded successively significantly higher heart rate than baseline. Results show that 68% of subjects in the yaw plane and 48% of subjects in the …
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Computational Simulations of a Non-body of Revolution Ellipsoidal Model Utilizing RANS
… streamwise and spanwise pressure gradients and yaw turn boundary layer characteristics, are also established. A range of conditions are studied including ahead, pitched up, steady 10 and 15 degree yaw turns, and unsteady 10 and 15 degree yaw turns. Simulation results show good agreement for …
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