Blar i PhD theses (TN-IKM / TN-IMBM) på tittel
Viser treff 1-20 av 32
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Activity-based life-cycle cost analysis : design, operation and maintenance in Arctic environment
(PhD thesis UiS;134, Doctoral thesis, 2011-08-25)Currently the oil and gas exploration and production is moving north towards the Barents Sea on the northern coast of Norway, north of the Arctic Circle. This unfamiliar operational environment of the Arctic poses new ... -
Aerodynamic loads on a wind turbine rotor in axial motion
(PhD thesis UiS;245, Doctoral thesis, 2015-03-13)This study investigates the unsteady aerodynamics of attached flow on a two-dimensional airfoil. The unsteady aerodynamics introduces aerodynamic damping of the offshore wind turbine structure and is thus important for ... -
Analysis and Management of Bottlenecks in Supply Networks : Towards a Structured Approach to Stabilization of Inbound Material Flow
(PhD thesis UiS;256, Doctoral thesis, 2015-06-11)Any organization whose business model is based on production relies, and is dependent, on providers of raw material which it transforms into products. Customers’ demand for products, and thus the producing firm’s demand ... -
Asset Integrity Management : Challenges, planning and implementations
(PhD thesis UiS;306, Doctoral thesis, 2016-08-23)The emergence of asset integrity management (ATM) in the petroleum industry has been encouraged by the demand for a safer and more sustainable workplace with respect to health, safety, environment, value generation and ... -
Bridge aerodynamics in skew winds: Generalized buffeting load modelling and response analysis
(PhD thesis UiS;, Doctoral thesis, 2022-11)This thesis deals with the modelling of wind loads on bridges. When turbulent wind blows past a bridge deck, the deck experiences fluctuating loads, i.e., buffeting loads. Most buffeting theories concern straight bridge ... -
Bridge deck aerodynamics: A case study in full-scale
(PhD thesis UiS;, Doctoral thesis, 2022-04)One of the key aspects of bridge deck aerodynamics is the transformation of the incident wind flow into fluctuating surface pressures around a bridge deck. The atmospheric turbulence generates fluctuating loads on bridge ... -
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 ... -
Design Optimisation of Power Cable Configurations for Floating Offshore Wind Turbines
(PhD Theses UiS;, Doctoral thesis, 2024)The present work investigates the design of dynamic inter-array power cable configurations for floating offshore wind turbines (FOWTs). It builds upon traditional design processes by integrating optimisation methods. Extensive ... -
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, ...