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 17 of 17 for “"directional stability."”.
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High Angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
… the aerodynamics of forebodies with positive directional stability has been revealed. An unconventional way of presenting the results is used to illustrate how a positive contribution to directional stability arises. Based on this new understanding, a parametric study was then conducted to …
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The directional stability and control of an airplane during the landing roll
This thesis considers the problem of the directional instability, as exhibited by aircraft with tricycle landing gear, during the landing roll after touchdown. The approximate equations of motion are solved on an analog computer to describe the motion of an aircraft as it moves along the runway …
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Crack Path Selection in Adhesively Bonded Joints
… with various T-stresses demonstrate that the directional stability of cracks in adhesive bonds depends on the T-stress level. Cracks tend to be directionally stable when the T-stress is compressive whereas directionally unstable when the T-stress is tensile. However, the direction of crack …
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Modeling and Control of an Active Dihedral Fixed-Wing Unmanned Aircraft
… is often selected based on lateral-directional stability requirements for the vehicle. A study to predict the effect of an active dihedral system on lateral-directional stability and vertical gust rejection capability was conducted to assess the performance and feasibility of the …
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Remote depth survey of the Charles River Basin
… fins were added to the stem of the USV kayak for directional stability without significant drag, permitting a maximum vessel speed of 4.4 knots. A total of 1485 latitude-longitude GPS points with corresponding depth measurements were taken. Charles Basin data was plotted with ArcGIS software and …
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The stability of an aircraft during the landing roll
The object of this thesis is to determine the directional stability of a tricycle-geared aircraft during the landing roll. The motion of the aircraft is simulated by a computer program based on the appropriate equations of motion. Empirical aircraft and tire data are utilized in order to improve …
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Stability and maneuvering of hybrid hydrofoil/SWATH in foilborne mode
… foilborne design is previously unassessed for stability and maneuvering characteristics. A six degree of freedom model of the foilborne vehicle dynamics is introduced as a framework to study vehicle stability and maneuvering. Linearized models of the vehicle dynamics are compared to the six …
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Directional analysis of an a-train double with damped articulation
… has steadily increased in North America. The directional stability and control limits of most combinations have been adversely affected by the increase in weights and dimensions, which has prompted many concerns related to operational safety of such vehicles. Particularly, A-train doubles, …
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Design study of flapping foil propulsion for an Odyssey Class autonomous underwater vehicle
… while dorsal and anal fins provide additional directional stability. A variety of motion schemes were contemplated, but the final design was chosen with an emphasis on simplicity, practicality, and robustness for use in a field setting.
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The lateral-directional characteristics of a 74-degree delta wing employing gothic planform vortex flaps
… investigation to determine the low-speed lateral-directional characteristics of a generic 74-degree delta wing-body configuration employing the latest generation, gothic planform vortex flaps has been conducted. In addition, the theoretical estimates from VORSTAB were compared against experimental …
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On the development of computer code for aircraft flight dynamics analysis
The stability analysis of the aircraft can be evaluated in two flight modes: longitudinal stability analysis and the lateral – directional stability analysis. The present work focused on the second mode of flight. The stability analysis carried out by evaluates the behavior of three flight …
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Analytical and Numerical Optimal Motion Planning for an Underwater Glider
… change may cause the vehicle to stall and lose directional stability. Optimal control theory is applied to the buoyancy and angle of attack scheduling of a point-mass model. A rigid-body model is analyzed on a singular arc steady glide. An analytical solution for the control required to stay on …
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Dynamic Modeling of a Supersonic Tailless Aircraft with All-moving Wingtip Control Effectors
… configuration lacked a vertical tail, a lateral-directional stability augmentation system was vital to its success. The lateral-directional dynamics were improved to Level 1 flying qualities through use of a modified roll/yaw damper. The modified controller fed yaw rate back to both the …
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A closed-loop driver/vehicle directional dynamics predictor
… of a heavy vehicle thus relates to not only its directional stability and control limits, but also the control performance limits of the driver. In view of their lower stability limits, the directional dynamics of articulated freight vehicles have been extensively investigated assuming either …
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Torque Actuated Rear Steering for Urban Electric Commercial Vehicles
… low speeds, 2. At high speed, improve roll-over stability and emergency braking and cornering performance while maintaining accurate path following. Chapter 1 reviews the current state of greenhouse gas emissions within the freight industry and methods for decarbonisation, predominantly the use …
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Intelligent vehicle motion control
… active steering technologies and a brake based directional stability controller. A non-linear vehicle handling model was developed for this study using the Mattab and Simulink tools. This consists of a 4 degree of freedom (d. o. f) lumped-parameter model that includes longitudinal, lateral, yaw …
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Model testing and computational analysis of a high speed planing hull with cambered planing surface and surface piercing hydrofoils
… design departed from the conventional dead-rise. Directional stability of the model in the pre-planing regime was increased by incorporating three vertices at the design dead-rise angle. A set of super-cavitating, surface-piercing hydrofoils were designed to be attached aft of the vessel transom …