Blar i NTNU Open på forfatter "Chai, Wei"
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A comparative study of the stochastic averaging method and the path integration method for nonlinear ship roll motion in random beam seas
Chai, Wei; Dostal, Leo; Næss, Arvid; Leira, Bernt Johan (Journal article; Peer reviewed, 2017)In this paper, the energy-based stochastic averaging method and the path integration method are applied to study the stochastic response of the nonlinear roll motion in random beam seas. Specifically, the Markov diffusion ... -
A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines
Cheng, Zhengshun; Madsen, Helge Aagard; Chai, Wei; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)Currently development of floating wind turbines for deep water is mainly based on horizontal axis wind turbines (HAWTs). However, floating vertical axis wind turbines (VAWTs) are possible alternative due to their potential ... -
Application of a sea surface roughness formula using joint statistics of significant wave height and spectral wave steepness
Myrhaug, Dag; Leira, Bernt Johan; Chai, Wei (Journal article; Peer reviewed, 2020)This article provides some statistical features of the sea surface roughness given as a function of the spectral wave steepness and the significant wave height suggested by Taylor and Yelland (J Phys Oceanogr 31:572–590, ... -
Assessment of methods for short-term analysis of riser collision probability
Fu, Ping; Leira, Bernt Johan; Myrhaug, Dag; Chai, Wei (Peer reviewed; Journal article, 2021)Reliability- and performance-based design of a riser cluster requires an accurate estimation of the extreme values of the stochastic relative distance between the risers during a given time duration. This study presents a ... -
A benchmarking exercise for environmental contours
Haselsteiner, Andreas F.; Coe, Ryan G.; Manuel, Lance; Chai, Wei; Leira, Bernt Johan; Clarindo, Guilherme; Soares, Carlos Guedes; Hannesdóttir, Ásta; Dimitrov, Nikolay; Sander, Aljoscha; Ohlendorf, Jan-Hendrik; Thoben, Klaus-Dieter; Hauteclocque, Guillaume de; Mackay, Ed; Jonathan, Philip; Qiao, Chi; Myers, Andrew; Rode, Anna; Hildebrandt, Arndt; Schmidt, Boso; Vanem, Erik; Huseby, Arne Bang (Peer reviewed; Journal article, 2021)Environmental contours are used to simplify the process of design response analysis. A wide variety of contour methods exist; however, there have been a very limited number of comparisons of these methods to date. This ... -
Comparative study of short-term extreme responses and fatigue damages of a floating wind turbine using two different blade models
Qu, Xiaoqi; Li, Yan; Tang, Yougang; Chai, Wei; Gao, Zhen (Journal article; Peer reviewed, 2020)In this work, two different blade structural models are used to estimate the blade deformations and the global structural responses of a 10MW floating offshore wind turbine (FOWT). One model is based on the Euler-Bernoulli ... -
Comparative Study of the Path Integration Method and the Stochastic Averaging Method for Nonlinear Roll Motion in Random Beam Seas
Chai, Wei; Dostal, Leo; Næss, Arvid; Leira, Bernt Johan (Journal article; Peer reviewed, 2017)In this work, the path integration method and the energy-based stochastic averaging method are introduced in order to study the stochastic responses of ship roll motion in random beam seas. Based on the Markov property of ... -
Development of environmental contours for first-year ice ridge statistics
Chai, Wei; Leira, Bernt Johan; Næss, Arvid; Høyland, Knut Vilhelm; Ehlers, Sören (Peer reviewed; Journal article, 2020)Ice ridges represent a major threat to ships and offshore structures in areas with sea ice but no icebergs, since they frequently determine and govern the structural design loads. This work focuses on the development of ... -
Environmental contours based on inverse SORM
Chai, Wei; Leira, Bernt Johan (Journal article, 2018)It is well known that the full long-term response analysis is recognized as the most accurate and reliable method for evaluation of the extreme response in the design of ships and marine structures. However, such a method ... -
Extreme Value Estimation of Beaufort Sea Ice Dynamics Driven by Global Wind Effects
Sinsabvarodom, Chana; Næss, Arvid; Leira, Bernt Johan; Chai, Wei (Journal article; Peer reviewed, 2022) -
Extreme Value Estimation of Mooring Loads Based on Station-Keeping Trials in Ice
Sinsabvarodom, Chana; Leira, Bernt Johan; Chai, Wei; Næss, Arvid (OMAE2020-18172, Chapter; Peer reviewed, 2020)he purpose of this work is to perform an extreme value estimation of the mooring loads associated with station-keeping of a ship operating in ice. In general, the design of mooring lines is based on estimation of the extreme ... -
Ice rose diagrams for probabilistic characterization of the ice drift behavior in the Beaufort Sea
Sinsabvarodom, Chana; Chai, Wei; Leira, Bernt Johan; Høyland, Knut Vilhelm; Næss, Arvid (Journal article; Peer reviewed, 2022) -
Long-term extreme response and reliability of a vessel rolling in random beam seas
Chai, Wei; Næss, Arvid; Leira, Bernt Johan (Journal article; Peer reviewed, 2018)In this paper, the long-term extreme response of a vessel rolling in random beam seas and the associated reliability evaluation are addressed. The long-term response analysis is based on the upcrossing rates of the roll ... -
Numerical Prediction of Ship-Ice Interaction: A Project Presentation
Hahn, Malte; Dankowski, Hendrik; Ehlers, Sören; Erceg, Sandro; Rung, Thomas; Huisman, Michael; Sjöblom, Henrik; Leira, Bernt Johan; Chai, Wei (Chapter; Peer reviewed, 2017)It is inevitable that commercial shipping and oil and gas resource exploitation activities in the Arctic will increase due to decreasing sea ice extent caused by global climate changes. Significantly more demanding and at ... -
On characteristics of ice ridges and icebergs for design of ship hulls in polar regions based on environmental design contours
Leira, Bernt Johan; Chai, Wei; Radhakrishnan, Gowtham (Journal article; Peer reviewed, 2021) -
On Correlation and Underlying Physics
Leira, Bernt Johan; Chai, Wei; Sinsabvarodom, Chana (Chapter, 2019) -
Probabilistic assessment of ice rose diagrams for ice drift in the beaufort sea
Sinsabvarodom, Chana; Chai, Wei; Leira, Bernt Johan; Høyland, Knut Vilhelm; Næss, Arvid (Journal article; Peer reviewed, 2019)The intention of this paper is to introduce the ice rose diagram, which is a graphical tool that makes it possible to display the ice drift speed, the occurrence frequency, and the drift direction at a particular location ... -
Probabilistic methods for estimation of the extreme value statistics of ship ice loads
Chai, Wei; Leira, Bernt Johan; Næss, Arvid (Journal article; Peer reviewed, 2017)It is well known that when a ship sails in ice-covered regions, the ship-ice interaction process is complex and the associated ice loads on the hull is a stochastic process. Therefore, statistical models and methods should ... -
Short-term extreme ice loads prediction and fatigue damage evaluation for an icebreaker
Chai, Wei; Leira, Bernt Johan; Næss, Arvid (Journal article; Peer reviewed, 2018)In this paper, the short-term extreme value statistics of the ice loads acting on ship hull and the fatigue damage due to ice loads actions are studied. Due to the stochastic nature of the ice-induced loads and randomness ... -
Short-term extreme mooring loads prediction and fatigue damage evaluation for station-keeping trials in ice
Sinsabvarodom, Chana; Leira, Bernt Johan; Chai, Wei; Næss, Arvid (Journal article, 2021)Full-scale tests of station-keeping trials (SKT) in drifting ice were conducted as part of research activities undertaken by the company Equinor in the Bay of Bothnia in March 2017. In the SKT project, Magne Viking was ...