Blar i NTNU Open på forfatter "Sævik, Svein"
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Comparing alternative flexible pipe fatigue stress models with focus on the Bflex helix models
Wang, Lidong (Master thesis, 2014)this thesis deals with the stress and slip behaviour for non-bonded flexible pipe of three different models (itcode0, itcode1 and fullfe), comparisons are made among these three models. Besides, pipes with different cross ... -
Comparison of Different Methodologies for Dynamic Installation Analysis of Flexibles
Anfinsen, Eirin (Master thesis, 2011)Subsea umbilicals and power cables are essential components in sea bed infrastructure, and necessary for control and monitoring of remote wells. By acting as a fixed link between a platform and a subsea wellhead, umbilicals ... -
Comparison of the stress distribution in the metallic layers of flexible pipes using two alternative Bflex formulations
Shi, Yunzhu (Master thesis, 2014)Axisymmetric load is the most common load acting on flexible pipe. Modelling axisymmetric load correctly is very important to estimate the strength of a flexible pipe. The purpose of the thesis is to compare the stress ... -
Comparison study of umbilicals' curvature based on full scale tests and numerical models
Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2016)A full scale test was carried out for a dynamic steel tube umbilical under combination of tensile and bending loads. The purpose of the test was to investigate the behavior of the dynamic bending under complex loading ... -
Data-Driven Prediction of Vortex-Induced Vibration Response of Marine Risers Subjected to Three-Dimensional Current
Riemer-Sørensen, Signe; Wu, Jie; Lie, Halvor; Sævik, Svein; Kim, Sangwoo (Chapter, 2019)Slender marine structures such as deep-water marine risers are subjected to currents and will normally experience Vortex Induced Vibrations (VIV), which can cause fast accumulation of fatigue damage. The ocean current is ... -
Data-driven simultaneous identification of the 6DOF dynamic model and wave load for a ship in waves
Ren, Zhengru; Han, Xu; Yu, Xingji; Skjetne, Roger; Leira, Bernt Johan; Sævik, Svein; Zhu, Man (Peer reviewed; Journal article, 2023)In marine operations, the performance of model-based automatic control design and decision support systems highly relies on the accuracy of the representative mathematical models. Model fidelity can be crucial for safe ... -
Deep Reinforcement Learning Based Parameter Optimisation for Installation Analysis of Marine Cables
Sætre, Sanne Lin (Master thesis, 2023)Masteroppgaven "Deep Reinforcement Learning basert parameter optimalisering for installasjonsanalyse av sjøkabler" utforsker anvendelsen av deep reinforcement learning (RL) teknikker innen marin kybernetikk. Målet med denne ... -
Design of Floating Offshore Wind Turbine Tower Structures
Bordal, Marie Schrader; Bjørshol, Hanna Flem (Master thesis, 2023)Den økende etterspørselen etter fornybar energi har ført til utviklingen av offshore vindparker, som overgår begrensningene til landsbaserte parker når det gjelder tilgjengelige landområder og kontinuerlige, stabile ... -
Design of Floating Offshore Wind Turbine Tower Structures
Bjørshol, Hanna Flem; Bordal, Marie Schrader (Master thesis, 2023)Den økende etterspørselen etter fornybar energi har ført til utviklingen av offshore vindparker, som overgår begrensningene til landsbaserte parker når det gjelder tilgjengelige landområder og kontinuerlige, stabile ... -
Dynamic Analysis of Floating Dock Structures
Børkja, Joakim Le Boulvais (Master thesis, 2015)This paper concerns a dynamic analysis preformed on a floating dock structure. The structure was installed by Bi-Brygga AS and failed in 2013 during a winter storm. Bi-Brygga AS offered this structure as a case study for ... -
Dynamic Analysis of ROV Operation
Jenssen, Fredrik Rødne (Master thesis, 2015)At the semi-submersible rig Snorre B, the work class remotely operated vehicle (WROV) is essential to perform drilling and production activities. Currently, the weather criterion for launching the ROV is set to four meters ... -
Dynamic behavior of subsea wellhead and shallow pipe under seismic action
Liu, Yuhan; Fan, Honghai; Sævik, Svein; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)The interaction between shallow pipe and soil near the subsea wellhead is an important factor in the maintenance of subsea wellhead stability. First, a seismic test was conducted. A shaking table and a shear model box were ... -
Dynamic Load Effects on a Submerged Floating Tube Bridge with emphasis on Vortex-induced Vibrations
Schack, Maria Hapnes von (Master thesis, 2017)A ferry-free highway is under planning of the Norwegian Public Roads Administration on the south-west coast of Norway. Many of the fjords are characterized as very deep and wide, resulting in a need for innovative, new ... -
Dynamic Response of Flexible Pipes Considering Different Damping Models
Liu, Xueying (Master thesis, 2014)Flexible pipe is a layered structure composed of plastic and steel materials. Under a large bending moment, the pipe layers may slide relative to each other due to internal friction. The moment curvature relationship for ... -
Dynamic Response of Flexible Pipes During Installation
Lu, Xin (Master thesis, 2013)This paper is referring to performing dynamic analysis for an installation scenario with the bi-linear assumption for the bending moment stiffness, which is the governing component stiffness for the curvature at the touching ... -
Dynamic Stress Behaviour of Bonded Pipes and Umbilicals
Li, Chunyu (Master thesis, 2015)The main objective of this thesis is to study the characteristics of different types of flexible pipes and summarize the existing analytical methods, and to establish the models in order to simulate dynamic stress behavior ... -
Dynamic Stress due to End Effects in of Non-bonded Flexible Pipes
Li, Miao (Master thesis, 2015)In oil and gas industry, flexile riser is a crucial component for the production system which connected the seabed and the floating units. At the upper end of the flexible riser, bend stiffener is added to reduce the over ... -
Effect of lay angle of anti-buckling tape on lateral buckling behavior of tensile armors
Zhou, Chongyao; Sævik, Svein; Ye, Naiquan; Ji, Guomin (Chapter; Peer reviewed, 2015)During deep water flexible pipe installation, the pipe is normally free hanging in empty condition from the installation vessel to the seabed. This will introduce large hydrostatic forces to the pipe causing true wall ... -
Efficiency improvement on the ANCF cable element by using the dot product form of curvature
Zhang, Peng; Duan, Menglan; Gao, Qiang; Ma, Jianmin; Wang, Jinxin; Sævik, Svein (Peer reviewed; Journal article, 2022)The adoption of the continuum mechanics concept has enabled the absolute nodal coordinate formulation (ANCF) cable element to handle large deformation and large rotation problems. Generally, the generalized elastic forces ... -
Estimation of VIV-parameters based on Response Measurements and Bayesian Machine Learning Algorithms
Andersen, Martin Lieberkind; Sævik, Svein; Leira, Bernt Johan; Wu, Jie; Langseth, Helge; Passano, Elizabeth Anne; Lie, Halvor; Yin, Decao (Chapter, 2022)Analysis of structural response levels due to hydro-elastic vortex-induced vibrations (VIV) involves the specification of several parameters both associated with the fluid flow and the structural properties. To the maximum ...