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 87 for “"Subsea"”.
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Imperfect upheaval subsea pipeline buckling
… industrial practice with regard to in-service, subsea pipeline buckling. The role of imperfections is shown to be of central importance. These factors are considered in the context of modern offshore engineering practice, including the particular employment of trenching and/or burial for …
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Design of subsea energy storage chamber
… be stored offshore by displacing water from a subsea chamber. This chamber could be incorporated into the mooring system of present offshore harvesting devices to yield more favorable economics. This report establishes the baseline assumptions for designing this energy storage device and …
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Battery-Free Subsea Internet-of-Things
Bringing massive connectivity to low-cost, low-power ocean sensors is important for numerous oceanographic applications (across climate/weather modeling, marine biology, aquaculture, and defense). However, standard IoT technologies (e.g, Bluetooth, WiFi, GPS) cannot operate underwater, which has …
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Estimation of Wax Deposition in Subsea Pipelines
… model forecasting wax deposition rate within subsea production pipelines. This research employs experiments from 1-D and 2-D multiphase flow that have been successfully matched by a combined physics model on a closed-loop structure where the measuring length was 2.5m and the pipe inside …
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Estimation of Wax Deposition in Subsea Pipelines
… model forecasting wax deposition rate within subsea production pipelines. This research employs experiments from 1-D and 2-D multiphase flow that have been successfully matched by a combined physics model on a closed-loop structure where the measuring length was 2.5m and the pipe inside …
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Applications of Organic Electrochemical Transistors in Subsea Environments
… technology that offer significant advantages for subsea contaminant detection due to their stability in aqueous environments, ability to sense in complex solutions, and capability to amplify signals. This thesis investigates three applications of OECT sensing in subsea environments. The first …
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Design of position sensors for subsea oil tools
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Reliability evaluation for a subsea to shore production system
… of a new offshore production concept, the Subsea to Shore system, and the relationship between reliability and flow assurance. The offshore production system is assumed as a multi-state system and treated with the universal generating function approach. Based on probability analysis the …
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Design of an underwater vertical glider for subsea equipment delivery
Delivery of subsea equipment and sensors is generally accomplished with unguided sinking platforms or powered autonomous underwater vehicles (AUVs). An alternative would be to augment existing platforms with navigation and guidance capability, enabling them to actively guide themselves to their …
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An integrated approach to the design of moonpools for subsea operations
… the water column oscillation and the forces on a subsea unit in the moonpool may be predicted. The effects of a variety of geometrical configurations are then studied, both mathematically and experimentally, in order to select configurations which allow large modifications of the moonpool …
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Stochastic Motion Planning for Applications in Subsea Survey and Area Protection
This dissertation addresses high-level path planning and cooperative control for autonomous vehicles. The objective of our work is to closely and rigorously incorporate classication and detection performance into path planning algorithms, which is not addressed with typical approaches found in …
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High Performance Sensorless Controlled PMSM Drive with Long Cable for Subsea Applications
The increasing interest in subsea oil and gas as an energy source has led to a demand for highly efficient and reliable motors and their control. These motors are essential components of subsea applications like drilling, pumping, and boosting, which are necessary to extract natural gas and oil. …
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Modeling multiphase solid transport velocity in long subsea tiebacks: numerical and experimental methods.
… from deep/ultra-deep offshore through a long subsea tieback/pipeline is inevitable. This form of transportation is complex and requires accurate knowledge of critical transport velocity, flow pattern changes, phase velocity, pressure drop, particle drag and lift forces, sand/liquid/gas holdup, …
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Predicting hydrates plugging risk in subsea gas pipeline: CFD, analytical and linear regression modelling.
This study addresses critical limitations in managing hydrate plugging risk for gas pipelines. The main challenges lie in accurately predicting hydrate deposition rates and associated pressure drops. To overcome these limitations, the study developed and validated a 3D computational model using …
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FSI Methodology for Analyzing VIV on Subsea Pipeline Free Spans with Practical Boundary Conditions
The objective of this thesis is to develop a more realistic numerical model than current methodologies for free span stability of submarine pipelines based on fatigue analysis. A general assumption in performing vortex-induced vibration (VIV) analysis of pipeline free spans is that both ends of the …
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The design of a coiled tubing cutter for use in subsea oil drilling applications
… proper disconnect of an offshore system from a subsea wellhead during the testing of the well. Design requirements for the device were established by the requirements of the SenTree tool. Additional force requirements for the prototype were established through theoretical models and experimental …
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Trajectory planning and supervisory control for the cleaning and inspection of subsea structural nodes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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SUBSEE: An exploration and development of the 3D visualisation and grading of subsea survey data
High-resolution subsea surveying offers new opportunities to explore difficult or hazardous underwater environments and, when using multi-beam sonar, provides three-dimensional bathymetric data for visualisation. The primary focus of this practice-led research is whether the 3D visualisation and …
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Wireless Systems for a Sustainable Future: From Battery-Free Subsea IoT to THz-Based Agriculture Monitoring
… we design and implement an ultra-low power subsea backscatter communication system, enabling battery-free underwater imaging, sensing and localization. Second, the thesis describes a new technology that can support sustainability in agriculture through real-time food quality assessment that …
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Application of superparamagnetic nanoparticle-based heating for non-abrasive removal of wax deposits from subsea oil pipelines
… nanopaint coating on the internal surface of subsea pipelines could generate heat and thus remove formation of methane hydrates and wax. In our work, the role of key parameters affecting heating performance of superparamagnetic nanoparticles such as particle size, and magnetic field is …
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