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 14 of 14 for “"propulsion mechanism"”.
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Design, Simulation, and Experimental Validation of a Novel High-Speed Omnidirectional Underwater Propulsion Mechanism
… dissertation explores a novel omnidirectional propulsion mechanism for observation-class underwater vehicles, enabling for operation in extreme, hostile, or otherwise high-speed turbulent environments where unprecedented speed and agility are necessary. With a small overall profile, the …
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Biologically inspired underwater propulsion and adhesion mechanisms
… of this thesis include two different parts: a propulsion mechanism using a passive compliant tail and a reversible underwater adhesion mechanism. The propulsion mechanism is the primary concern of this research. The hypothesis of this part of research is that a continuous passive compliant tail …
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Design and Evaluation of a Propulsion System for Small, Compact, Low-Speed Maneuvering Underwater Vehicles
… In this thesis, the design and analysis of a new propulsion system for such underwater vehicles is presented. It consists primarily of a syringe and a plunger driven by a linear actuator and uses different inflow and outflow nozzles to provide continuous propulsive force. A prototype of the …
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Underwater Robotic Propulsors Inspired by Jetting Jellyfish
… understand the fundamentals of this new form of propulsion and subsequently translate the understanding onto the engineered platform to validate the hypothesis and construct robust models. Jetting jellyfish species are generally smaller in dimensions than rowing jellyfish, consume lower energy …
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Maintenance practices for emergency diesel generator engines onboard United States Navy Los Angeles class nuclear submarines
… nuclear reactors also require a backup means of propulsion. All underway Navy nuclear reactors are operated with diesel generators as a backup power system, able to provide emergency electric power for reactor decay heat removal as well as enough electric power to supply an emergency propulsion …
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Robust Model-Based Control of Nonlinear Systems for Bio-Inspired Autonomous Underwater Vehicles
… structural component to generate thrust, a propulsion mechanism that can be tuned to operate under resonance and consequently improve the overall system efficiency. The control parameter should then be selected to keep the system operating in such a condition. Another important aspect is to …
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Basic communication framework for a robotic device for the inspection of nuclear reactor piping structures
… of the a robot through water using a new type of propulsion mechanism. This first implementation of the designed software and electronics illustrates the adaptability of this work and its potential application in many iterations.
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Active lubricant-impregnated surfaces
… solid particles. The surface's droplet propulsion mechanism is described, and is demonstrated to operate independently of the fluid or solid's physical properties that normally inhibit motion (such as conductivity, viscosity, magnetization). In addition, several previous methods for …
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Design Options to Address Submersion Criticality for Low-Enriched Uranium Nuclear Thermal Propulsion Rocket
… method between Earth and Mars. Nuclear thermal propulsion (NTP) is well suited to be the main propulsion mechanism for interspace travel due to its high specific impulse. In order to develop a robust NTP system, the reactor core must be able to prevent a supercritical state from occurring in the …
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Non-equilibrium self-assembly processes of complex dipolar colloids
… developed with the aim to unveil the underlying mechanisms of structure formation and particle aggregation. The experimental systems motivating this work correspond to two prototype non-equilibrium processes, which are lane formation and diffusion limited aggregation. In the case of lane …
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Effect of Kinematics and Caudal Fin Properties on Performance of a Freely-Swimming Fin
… like fish to address the issue with alternate propulsion mechanism. Mostly, research on fish locomotion involved studying a foil tethered to a fixed point inside uniform flow. A major drawback of such study is that neither it resembles a freely swimming fish nor it takes into consideration the …
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Motion of Janus and Patchy Particles Near Various Boundaries
… has been used to shed more light on the propulsion mechanism of chemically active Janus particles in H<sub>2</sub>O<sub>2</sub>. Overall, the thesis contributes to a better understanding of the dynamical motion of both passive and active anisotropic particles near boundaries and provides …
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Motility of Swimming Bacteria Hydrodynamics and Statistics
… known as “taxis”. Here, we explore the mechanisms involved in the propulsion and navigation of swimming bacteria, using low Reynolds number flow techniques and random walks. First, we introduce the physical principles that govern the dynamics of a low Reynolds number swimmer. We pay …