Browsing NTNU Open by Author "Ye, Naiquan"
Now showing items 1-14 of 14
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Algorithmic formulation of clay and sand pipe–soil interaction models for on-bottom stability analysis
Longva, Vegard; Ji, Guomin; Sævik, Svein; Ye, Naiquan; Gjøsteen, Janne Kristin Økland; Giertsen, Egil; Wang, Yanbin (Peer reviewed; Journal article, 2021)This paper presents a new algorithmic formulation of the clay and sand pipe–soil interaction models recommended by the DNV-RP-F109 code for dynamic on-bottom stability analysis of submarine pipelines. The pipe–soil force ... -
An anisotropic friction model in non-bonded flexible risers
Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2018)The present paper addresses small scale friction tests and an anisotropic friction model to predict friction for the interface between the anti-wear tape and tensile armors in non-bonded flexible risers. Small scale friction ... -
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 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 ... -
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 ... -
Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals
Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Peer reviewed; Journal article, 2020)The present paper addresses the stresses in dynamic steel tube umbilicals at the platform hang-off exposed to large motions corresponding to an extreme storm condition. Experimental tests were carried out by mounting ... -
Fatigue Assessment of Aluminium Welded Box-stiffener Joints in Ships
Ye, Naiquan (Doktoravhandlinger ved NTNU, 1503-8181; 2008:88, Doctoral thesis, 2008)One of the trends in ship building is the building of larger and faster ships. However, increasing demand for speed has forced the ship designers to search for alternative materials to reduce the weight of the ship without ... -
Friction models for evaluating dynamic stresses in non-bonded flexible risers
Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2017)This paper addresses friction models used for evaluating dynamic stresses in non-bonded flexible risers. A review of the most commonly used methods to model friction between layers in such structures was performed. Four ... -
Integrated optimisation design of a dynamic umbilical based on an approximate model
Yang, Zhixun; Yan, Jun; Sævik, Svein; Lu, Qingzhen; Ye, Naiquan; Chen, Jinlong; Yue, Qian-Jin (Peer reviewed; Journal article, 2021)An optimised design of a dynamic umbilical requires an extreme cross-sectional stress to be maintained within an allowable limit and a fatigue life to be guaranteed to be sufficient. It should be noted that a dynamic ... -
Investigations of Shear Interaction and Stress in Flexible Pipes and Umbilicals
Dai, Tianjiao (Doctoral theses at NTNU;2018:368, Doctoral thesis, 2018)The present thesis deals with numerical modeling and experimental testing related to dynamic stress behavior of flexible pipes and umbilicals, with particular focus on shear interaction and friction effects. For the ... -
OMAE2017-62644 The Effect of Stick Stiffness of Friction Models on the Bending Behavior in Non-Bonded Flexible Risers
Dai, Tianjiao; Ye, Naiquan; Sævik, Svein (Chapter; Peer reviewed, 2017)This paper investigates the effect of stick stiffness on the bending behavior in non-bonded flexible risers. The stick stiffness was normally implemented in the friction model for calculating the friction stress between ... -
Transverse tensile armour buckling of flexible pipes
Zhou, chongyao (Master thesis, 2014)During the installation and operation process, the empty flexible pipe will experience a largeend fitting load which is the compression load at the ends of the pipe. At the same time, the dynamicload from wave and current ...