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 24 for “"marine structures"”.
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Estimation of residual stresses in marine structures
A finite element model that is capable of simulating the thermo-mechanical welding process was developed by using full thermal-elasto-plastic computational analysis and validated by comparison with experimental data. It shows that distortions predicted by the finite element model agree well with …
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Novel Lightweight Noise and Vibration Control Treatments for Marine Structures
… absorber designs were then tested on a large, marine-type plate (4 feet by 2 feet by 1/4 inch) and showed both broadband noise and vibration control from 60 Hz to 5 kHz. DVAs could reduce the vibrating plate resonance magnitudes on the order of 15 dB at their tuning frequencies while providing …
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Hull girder ultimate strength and fracture toughness of damaged marine structures
… bending moment on the intact & damaged ship structures must be extensively investigated. The rational interaction equations must be developed, which based on the extensive ship types. - Accidents such as collision, grounding and explosions occur and can have major consequences to the ship …
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Load measurement of in-service marine structures to influence their design.
… intensities will inform the design process of marine structures and could result in lighter and more efficient designs. This research investigates the possibility of solving these problems employing artificial intelligence (AI) as an alternative to the current methods. Few studies have applied …
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Three dimensional geometrical and material nonlinear finite element analysis of adhesively bonded joints for marine structures
… joining method has been gaining recognition in marine industry in recent years, though it has been widely adopted in other fields such as aerospace, automobiles, trains and in civil constructions. The type of materials used and design practices followed in marine structures are different from …
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Asymptotically optimal path planning and surface reconstruction for inspection
Motivated by inspection applications for marine structures, this thesis develops algorithms to enable their autonomous inspection. Two essential parts of the inspection problem are (1) path planning and (2) surface reconstruction. On the first problem, we develop a novel analysis of asymptotic …
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Modified inverse first-order reliability method (I-FORM) for predicting extreme sea states
… of the standard current practice for designing marine structures to survive extreme sea states. Such environmental contours are characterized by combinations of significant wave height (Hs) and energy period (Te) or peak period (Tp) values calculated for a given recurrence interval using a set …
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Análise de estruturas marítimas e sistemas flexíveis constituídos por cabos
… presents a procedure to nonlinear analysis of marine structures with cable arrays, by using the finite element method. A catenary cable element is employed. A computer program has been developed, using FORTRAN language and implemented in the system Burroughs B6700. This program allows statics …
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The Biology of Spaeroma Terebrans in Lake Pontchartrain, Louisiana with Emphasis on Burrowing
… this isopod is found burrowed in wood and marine structures of fresh to saline water. Existing literature on S. terebrans focuses on the destruction of red mangrove (Rhizophora mangle) in India, Pakistan, and Florida. This study concentrates on S. terebrans habitat and boring preferences in …
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The effect of cyclic wetting and drying on the corrosion rate of steel in reinforced concrete
… chloride-induced reinforcement corrosion in marine concrete structures remains a concern for structural engineers. Marine structures are typically exposed to high chloride concentrations through direct exposure to sea water, which provides the primary conditions required for reinforcement …
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A numerical eigenmode analysis of the progressive buckling of thin-walled tubes
… impact is concerned with the behaviour of structures subject to static and dynamic loads which produce inelastic deformations. This field is of particular interest for the crash-worthiness design of aeroplanes, motor cars, buses, trains, ships and marine structures, where the survivability …
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Range-based navigation of AUVs operating near ship hulls
… the inspection of ship hulls and other submerged marine structures which has been successfully demonstrated to achieve a coverage rate on the order of 700m2/hour with centimeter-scale resolution for a variety of hull types. AUV navigation often involves dead reckoning based on velocity …
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An experimental investigation of pressure of a simple dam break generated wave impacting a plate
… the strength needed in the building materials of marine structures that may be struck by tall waves. These waves may be caused by storms, tsunamis, or dam breaks and can cause serious damage. This thesis presents two experiments aimed at measuring the pressure exerted by a wave. In both …
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Investigation Into Snap Loading of Cables Used in Moored Breakwaters
… snap loads in mooring lines. Breakwaters are structures used to attenuate or eliminate waves and protect shorelines, harbors, and other natural and man-made marine structures from wave damage. The breakwater in this investigation is modeled both as a point mass and as a rigid body. Both models …
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Al-Ga Sacrificial Anodes: Understanding Performance via Simulation and Modification of Alloy Segregation
Marine structures must withstand the corrosive effects of salt water in a way that is low cost, reliable, and environmentally friendly. Aluminum satisfies these conditions, and would be a good choice for a sacrificial anode to protect steel structures if it did not passivate. However, various …
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Evaluation of the durability of elastomeric easy-release coatings
… to solve problems associated with biofouling of marine structures, particularly ship hulls. The best candidates to date are multilayered coatings incorporating silicone rubber technology. These materials are efficient because they exhibit excellent release properties. However, they are very soft …
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Fatigue behaviour of CFRP-repaired corroded RC beams
… and deterioration can be a major problem in marine structures and bridges. Such structures are often subjected to oscillating loads that cause fatigue, significantly reducing the life of the structure. With the use of fibre reinforced plastics (FRPs) to rehabilitate and extend the life of …
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A life cycle assessment method for alternative material selection strategies in boat structures
… lightweight and lower maintenance costs to the marine industry in the leisure, fast and fishing boats sectors. The social and economic benefits of using composite materials have made users complacent about the pollution and the health and safety issues associated with these materials. As the …
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Investigation of New, Low-Voltage, Aluminum, Sacrificial Anode Chemistries
… induced by cathodic protection on ships and marine structures. As compared to high voltage anodes, low voltage, aluminum, sacrificial anodes reduce the likelihood of causing hydrogen embrittlement or stress corrosion cracking when used to protect high strength steels. In this study, open …
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Computations of fully nonlinear three-dimensional wave-body interactions
… challenges in the design of surface ships and marine structures, owing to the complexity of the hydrodynamic problem itself and limited computational facilities. This research is focused on: (i) development of a highly efficient numerical scheme for the computation of fully-nonlinear …
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