Blar i PhD theses (TN-IKM / TN-IMBM) på tittel
Viser treff 7-26 av 30
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Crack Arresting using Cutout Repair in Tubular Offshore Joints
(PhD thesis UiS;, Doctoral thesis, 2023)Finding efficient repair methods for cracked tubular joints in offshore structures is important, both as a permanent or temporary repair solution. The exploration of such methods and techniques includes the use of hole ... -
Cracking Behavior of Reinforced Concrete Structures Subjected to Service Load: Experimental and Numerical Investigation
(PhD thesis UiS;, Doctoral thesis, 2021-10)Cracks in reinforced concrete (RC) structures are controlled to enhance the service life, for a better aesthetic appearance, and to avoid leakages in liquid retaining structures. The most widely used crack controlling ... -
Design and Dynamic Analysis of a Novel Subsea Shuttle Tanker
(PhD thesis UiS;, Doctoral thesis, 2023)Underwater pipelines, tanker ships, and liquefied gas carriers have traditionally been employed to transport hydrocarbons between offshore oil and gas facilities and onshore locations. However, both methods come with ... -
Development of Advanced Numerical Tools for Dynamic Analysis of Aquaculture Structures
(PhD thesis UiS;, Doctoral thesis, 2022-04)Numerical methods to accurately predict dynamic responses of marine aquaculture structures are essential in the engineering design process, because these structures can be subjected to large wave and current loads in the ... -
Dynamic behaviour of jackets exposed to wave-in-deck forces
(PhD thesis UiS;17, Doctoral thesis, 2005)During the last decade, wave-in-deck loading on fixed offshore structures has increasingly been acknowledged as an issue of concern to the offshore oil and gas industry. Being mainly an issue for existing structures, the ... -
Effect and consequence analysis of expanding PIN-technology in various types of heavy machinery
(PhD thesis UiS;, Doctoral thesis, 2023)Expanding pin systems can be applied in any joint, moveable, or fixed, in any type of machine, crane, or equipment, in almost any type of industry, globally. There are a variety of different versions of expanding pins ... -
Experimental and Numerical Investigation of Residual Stress for Structural Integrity Assessment of Proximity Girth Welds
(PhD thesis UiS;, Doctoral thesis, 2023-01)Over the last decade, there has been a growing interest in the life extension of existing welded structures in offshore and renewable industry. During this phase of extension, repair of welded structures is a common practise ... -
Fatigue of Structural and Additively Manufactured Steels: Damage Assessment and Modelling Techniques
(PhD thesis UiS;, Doctoral thesis, 2022-09)The topics of damage assessment by in situ measurements before a macroscopic crack has been initiated, nonlinear damage modelling and additive manufacturing are herein discussed and researched from the perspective of the ... -
Fuel Cell Powered Drone: Use of Fuel Cells to Extend Multirotor Drone Endurance
(PhD thesis UiS;, Doctoral thesis, 2021-10)Unmanned aerial systems can be used for a range of industrial applications to reduce risk, cost, and time. Fuel cell-based propulsion systems are outlined as a solution to extend mission endurance, one of the current main ... -
Identifying innovation opportunities emerging from technology and business trends
(PhD thesis UiS;, Doctoral thesis, 2023)Businesses are continuously looking for opportunities to innovate. There is a gap in the literature regarding innovation models and approaches that are systematic, practical and easy to apply. This thesis addresses this ... -
Industrial Service Strategy : Development, Implementation and Execution
(PhD thesis UiS;19, Doctoral thesis, 2005)Increasingly, as markets become more competitive and globalized, industrial service providers are dependent on effective and efficient service strategies to achieve a certain level of customer satisfaction and ... -
Life extension of offshore structures : A conceptual framework and fatigue damage models
(PhD thesis UiS;, Doctoral thesis, 2019-09)Many offshore structures worldwide are approaching or have already exceeded their original design life. It is important to use the existing infrastructure efficiently and to estimate remaining service life accurately. ... -
Load sequence effects and mixed-mode fatigue crack growth in offshore structures
(PhD thesis UiS;, Doctoral thesis, 2019-12)An increasing number of the offshore structures in the North Sea are being operated in a life extension phase, which means that their original design life has been exceeded. As the structures age, they are deteriorating, ... -
Mineral Replacements in Flooding Experiments Linked to Enhanced Oil Recovery in Chalk
(PhD thesis UiS;, Doctoral thesis, 2018-11)Seawater injection into chalk-reservoirs on the Norwegian Continental Shelf has increased the oil recovery and reduced seabed subsidence. In the researchfield of Improved Oil Recovery (IOR) the effects of injection of ... -
Numerical Modeling and Dynamic Analysis of Two-Rotor Floating Offshore Wind Turbines
(PhD thesis UiS;682;, Doctoral thesis, 2023)The exploitation of offshore wind in deep waters by means of floating wind turbines is steadily gaining traction as a suitable option to produce renewable energy. Among the innovative technologies recently proposed, two-rotor ... -
Numerical Modelling and Global Response Assessment of Floating Docks towards Efficient, Safer and Autonomous Docking Operations
(PhD thesis UiS;, Doctoral thesis, 2024)Floating docks are known for their construction efficiency and operational flexibility compared to traditional graving docks. They play an important role in shipyards by serving as essential platforms for vessel construction, ... -
Numerical Simulation and Customized DACM Based Design Optimization
(PhD thesis UiS;, Doctoral thesis, 2018)The diverse numerical modelling, analysis and simulation tools that have been developed and introduced to markets are intended to perform the virtual design and testing of products and systems without the construction of ... -
Offshore Structures Exposed to Large Slamming Wave Loads
(PhD thesis UiS;, Doctoral thesis, 2017-12)In sloping shallow water regions, waves undergo different nonlinear transformations such as wave shoaling and breaking, due to the nonlinear wave interactions with the seabed. The forces from breaking waves are of concern ... -
On wave-wind interactions and implications for offshore wind turbines
(PhD thesis UiS;235, Doctoral thesis, 2014-11-17) -
Production Performance Analysis : Reliability, Maintainability and Operational Conditions
(PhD thesis UiS;144, Doctoral thesis, 2011-11-28)With the increasing demand for energy over recent decades, the Arctic region has become an interesting area for future exploration and development for the oil and gas industry. The Arctic region is known to have a harsh ...