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 20 for “"marine vessels"”.
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Wedged Vortex Generator Applications for Marine Vessels
This thesis investigates the effectiveness of vortex generators (VGs) in reducing viscous drag in hydrodynamic applications. Initial experimental and computational fluid dynamics analyses identified wedge-shaped VGs as the optimal design for flow manipulation. Comparative testing of three wedge …
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Design of marine vessels for improved damage tolerance
… increase the energy absorbing capabilities of a marine vessel in a collision. The structural model of the vessel includes the stiffened shell, web frame supports, and rigid bulkheads. The failure criterion used is hull rupture, appropriate for tanker design. The collision scenario is a right …
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Potential market for LNG-fueled marine vessels in the United States
… attention being paid to existing technologies in marine engineering that lessen ship emissions. It is estimated that the share of emissions from shipping to total global emissions is increasing, as world trade grows, and land-based emissions sources become cleaner. Shipping currently accounts for …
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Exploring the possibility of placing traditional marine vessels under oscillating foil propulsion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Classification of Marine Vessels in a Littoral Environment Using a Novel Training Database
… detailed classification and categorization of marine vessels commonly found in littoral environments. This research seeks to fill this void and is the combination of a multi-stage research endeavor designed to provide the missing marine vessel ontology. The first of the two stages performed to …
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Determining Emission Factors from Marine Vessels Employing Differential Optical Absorption Spectroscopy (DOAS) and Tunable Diode Laser Absorption Spectroscopy (TDLAS)
… and the sulfur content of fuels for individual marine vessels and trucks passing the measurement site with simultaneous remote measurements of SO2 and CO2 using active-DOAS and TDLAS. A demonstration of the feasibility of the project was carried out by measuring sulfur dioxide (SO2) and carbon …
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Development of a Distributed Simulation Cluster for MOOS-IvP
… important for large, expensive assets, such as marine vessels, where the cost of any failure is high. This thesis discusses the architecture, implementation, and use of an expandable simulation toolbox for MOOS-IvP. The toolbox utilizes Monte Carlo simulations since these are incredibly flexible …
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Modelling and Simulation of Marine Cables with Dynamic Winch and Sheave Contact
Cable-sheave systems are commonly used on marine vessels for lifting and towing applications. As a result of the motion of the vessel, the cable can detach from the surface of the sheave. This thesis presents a simulation of a towed cable system which includes the interaction of the cable with the …
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Electrifying a Jet Ski: Designing & Manufacturing an Electric Drivetrain for a Personal Watercraft
… well into their transition to electrification, marine vessels are lagging behind; specifically, there are very few electric personal watercrafts (PWC) on the market. Though many engineers and hobbyists have retrofitted combustion engines for cars, motorcycles, and other automobiles for electric …
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Investing in aircraft: the South African legal landscape and the partnership model of acquisition
… movable assets such as transport containers (for marine vessels). Included in this asset class would be investment in aircraft and aviation products. The lack of sophisticated infrastructure in Africa has adversely impacted on the growth and development of Southern Africa, but it has presented a …
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Global Estimation Methodology for Wave Adaptation Modular Vessel Dynamics Using a Genetic Algorithm
<p>Determining parameters for a system model for marine vessels becomes more difficult as the model is made more complex. Work has been done to determine the equations of motion, but not to fully define how to estimate all of the system parameters. This work utilizes a global optimization …
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Path Planning for Autonomous Sailing Vessels: Developing Robust and Efficient Survey Strategies
Autonomous sailing vessels offer a promising solution for maritime research, offering low maintenance and sustainable platforms for environmental monitoring and data collection. These vessels utilize wind power, eliminating the need for conventional fuel and enabling long-duration operations with …
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Electroplated composite coatings with incorporated nano particles for tribological systems with the focus on water lubrication
… to broad oceanic applications, for example, marine vessels, conventional power plants, tidal and wave energy systems and other water-lubricated industrial bearings. The current research project aims to evaluate the feasibility of the electrodeposited Ni–based nanocomposite coatings for …
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Hull construction with composite materials for ships over 100 m in length
… the maritime industry requires high performance marine vessels, which demand increased structural integrity and durability, coupled with significant weight reduction and minimization of cost. The design and fabrication of a "large vessel" by use of composite materials is within the current …
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Lorentz actuators for turbulence control and underwater acoustic communications
… and have several potential applications in the marine field. Two areas of interest where improvements would lead to significant contributions are the turbulence control and underwater acoustic communication fields. The ability to control turbulence is directly associated with controlling drag. …
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A Mathematical Model To Simulate Small Boat Behaviour
… technique for predicting the behaviour of large marine vessels. For a variety of reasons, mainly related to effects of scale, existing models are unable to adequately predict the manoeuvring characteristics of smaller vessels. The accuracy with which the performance of a boat under autopilot …
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Application and evaluation of high speed data transfer for decision support in remote health care.
… scenarios viz. remote communities, merchant marine vessels and offshore installations. In each scenario, telemedical technology and new operational procedures were devised and applied, taking into account the health care requirements of the remote population and the medical education of the …
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Developing a Large-Scale Multi-Modal Modeling and Optimization Framework for Freight Transport Network Analysis
Global freight transportation is confronted with unprecedented challenges from heightened logistical complexity, operational uncertainty, and the pressing necessity to minimize environmental footprints. Current simulation models tend not to represent very well the dynamic interaction between …
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Non-Linear Robust Observers For Systems With Non-Collocated Sensors And Actuators
<p>Challenges in controlling highly nonlinear systems are not limited to the development of sophisticated control algorithms that are tolerant to significant modeling imprecision and external disturbances. Additional challenges stem from the implementation of the control algorithm such as the …