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 8 of 8 for “"Underwater propulsion"”.
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Biologically inspired underwater propulsion and adhesion mechanisms
… of this research is to develop an innovative underwater pipe inspection robot with both swimming and crawling capabilities as opposed to conventional in-pipe robots with wheeled designs or driven by propellers. The contents of this thesis include two different parts: a propulsion mechanism …
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Parallel pulsed jets for precise underwater propulsion
A significant limitation for underwater robots is their ability to maneuver in tight spaces or for complex tracking tasks. Next generation vehicles require thrusters that can overcome this problem and efficiently provide high maneuverability at low speeds. Recently, thruster design has begun to …
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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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Are there structural differences in the flight feathers among Procellariiformes related to the use of wings for underwater propulsion?
… lesser extent, gannets use their wings to ‘fly’ underwater as well as in the air. These different environments differ greatly in terms of density. The aim of this study is to investigate if there are differences in the flight feathers of seabirds that use their wings for both underwater and …
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The optimization of a dual foil flapping device
… capacity than any man-made device. If their propulsion methods could be replicated mechanically, the benefits to underwater propulsion would be great. A dual foil pitching-plunging device is used to replicate the basic swimming motion of a dolphin. Numerical simulations are used to predict …
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Comparison of the long bone microstructure of two southern African marine birds, the Cape gannet (Morus capensis) and the African penguin (Spheniscus demersus) with respect to their aquatic adaptations
… On the other hand, the flightless penguin swims underwater using only its forelimbs. In this study, the long bones of ten penguins and nine gannets were compared in terms of microanatomy and histology with respect to ontogenetic stage (hatchlings, juveniles and adults) and locomotion. …
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A comparison study of biologically inspired propulsion systems for an autonomous underwater vehicle
The field of Autonomous Underwater Vehicles (AUVs) has increased dramatically in size and scope over the past two decades. Application areas for AUVs are numerous and varied; from deep sea exploration, to pipeline surveillance to mine clearing. However, one limiting factor with the current …
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Propulsion optimization for ABE, an autonomous underwater vehicle (AUV)
… primarily on the power consumption of the propulsion system, the control system and the sensor packages. A customized propulsion thruster is designed. This includes a specialized propeller tailored to ABE and a matched motor and transmission. A non-linear lumped parameter model of the …