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 95 for “"Sail"”.
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Blue sail come cover
Blue Sail Come Cover is a study of love—an investigation of care blurred by fear and gratitude, a searching for sign in world and word, both. These poems explore conditions of loss and fear, and within those wounds, the necessity of love and its manifestations—patience and care. This manuscript's …
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Optimization of sail design
… technique to optimize two dimensional sail design. Overall, we consider two distinct problems. The first problem deals with an unconstrained optimization of the lift. Then, to develop the second problem, we introduce an integrated form of Stratford's separation criterion as a limiting …
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Extraplanetary Exploration Using Electric Solar Wind Sail
… exploration using an electric solar wind sail (E-sail). The E-sail is a novel propellantless propulsion technology that harvests energy by repelling the charged particles in solar wind. It consists of a spinning central spacecraft connected by kilometer-long and thin positively charged …
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A comparison of experimental and theoretical sail forces
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1990.
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Design of a high performance solar sail system.
Thesis. 1979. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.
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A sail force dynamometer : design, implementation and data handling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989.
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Design study of a solid-state heliogyro solar sail
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Counter-Intuitive Behavior in Locally Optimal Solar Sail Escape Trajectories
… escape trajectories using an idealized solar sail for propulsion are presented. Results obtained using a trajectory propagator that maximizes the instantaneous rate of increase in total orbital energy to achieve escape---an intuitive control strategy originally presumed to generate …
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An image processing based system for three dimensional sail shape analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1991.
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Design, instrumentation, and control of a heliogyro solar sail ground test demonstrator
… and Control of a Heliogyro Solar Sail Ground Test Demonstrator Thesis directed by Dr. Keith Williams The goal of this research is to establish a means for terrestrial testing and model verification for heliogyro solar sail technology. A simplified testbed was in place but utilized …
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Investigation of Trajectory and Control Designs for a Solar Sail to the Moon
… the technical feasibility of a solar sail-based spacecraft (sailcraft) as a low-cost method of delivering cargo or science instruments to the moon and demonstrates how this sailcraft could be controlled to change its orbit. The concept is a low-cost, commercial launch …
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The analysis of partially separated flow on sail systems using a sectional method
Yacht sail systems are subjected to low speed and transitional flow. Because of the<br/>supporting structure (mast and boom) of the sail system and the curvature of sail<br/>membrane, sail systems also have a partially separated flow.<br/><br/>In this work, it is introduced the sectional method as …
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An experimental investigation of full-scale sail aerodynamics using pressures, shapes and forces
Sail aerodynamics is an active field of study in the research community. The basic behaviour of sails in steady conditions is well known due to numerical computations and wind tunnel testing, but there are several unanswered questions about the sail aerodynamics in actual, dynamic, sailing …
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Determining youths' level of understanding of environmental concepts in the sail training environment
… of four environmental concepts. The crew of the sail ship noted their responses during various lessons offered on board before proceeding with the next. The results indicated that the participating youth were able to compare two different observed scenarios as being either similar or different, …
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The unmanned ship sets sail - is South Africa prepared to open The Ship Register?
The dissertation discusses unmanned shipping from a South African perspective. While some nations are trailblazers in this field, other states lack behind and do not yet provide with a clear strategy for the future. Hence, the threat is real that they might be too late and will lose out in the …
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"We'll Sail Like Columbus": Race, Indigeneity, Settler Colonialism, and the Making of South Asian Diasporas in Canada
This dissertation is an interrogation of colonial and racial formations in the making of white settler states. Through an intersectional and transnational exploration of proximities between South Asians and Indigenous peoples in Canada, the dissertation unravels South Asian complicities in ongoing …
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Unsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Model
… for two model configurations: barebody and sail-on-side case. The dynamic plunge-pitch-roll model mount (DyPPiR) is used to simulate the pitchup maneuvers. The pitchup maneuver is a linear ramp from 1° to 27° in 0.33 seconds. All the tests are conducted at ReL=5,500,000 with a nominal wind …
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A Comparison of PID and Sliding Mode Controllers When Applied to the Orbit Raising of a Satellite Using Solar Sail Propulsion
<p>Solar Sail spacecraft have become increasingly popular due to their ability to perform long term missions without the need for propellant. Because solar sail propulsion is so unique, most research has been focused on developing new mechanical control techniques. However, it can be argued that …
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Mathematical modelling of unsteady problems in thin aerofoil theory
… a thin, flexible membrane fixed at both ends (a 'sail') is then considered. The steady sail is analysed for the case of an inextensible sail and previous work on this topic is extended by using a discretisation of the singular integro-differential equation that is pertinent to the later analysis …
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Investigation Into the Mitigation of the Effects of Uncertain Optical Degradation on an Interplanetary Solar Sail Mission Using a Single Model Update
<p>The renewed academic interest in using solar sails as a source of spacecraft propulsion has been accompanied by a recent fervor of investigations into non-ideal and off-nominal sail performance considerations. One of the most influential considerations, uncertain optical degradation, has been …
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