Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme最新文献_第2页

Numerical study on keying capacity of gravity installed anchors in sand 砂土中重力锚杆锚固能力的数值研究

4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-27 DOI: 10.1115/1.4063937

Dr. Haixiao Liu, Depeng Jiao, Zhou Li, Chenyang Zhang, Yancheng Yang

{"title":"Numerical study on keying capacity of gravity installed anchors in sand","authors":"Dr. Haixiao Liu, Depeng Jiao, Zhou Li, Chenyang Zhang, Yancheng Yang","doi":"10.1115/1.4063937","DOIUrl":"https://doi.org/10.1115/1.4063937","url":null,"abstract":"Abstract Being the latest representative of GIAs, the OMNI-Max anchor performs comprehensive behaviors in the seabed, like keying and diving, by adjusting orientation and position to derive higher capacity and therefore to avoid anchor failure. Current research of OMNI-Max anchors is concentrated on clay, while there is a notable gap of the work on sand. During the keying process of GIAs, many factors may influence the keying capacity, such as the embedment depth, the anchor orientation, the rotational center, the bearing area and the soil strength. Large deformation finite element analyses combined with a bounding-surface plasticity constitutive model are performed to investigate systematically the keying behavior of GIAs. A series of analytical cases involving multiple factors are designed and analyzed to explore the effects of various factors on the keying capacity of GIAs, defined by the soil resistance coefficient during keying. The soil resistance coefficient increases with increasing soil density, while it tends to be stable with the increase of the embedment depth. The closer the rotational center approaches to the two ends of the anchor, the greater the soil resistance coefficient becomes. An explicit expression of the soil resistance coefficient during keying is derived to quantify the effects of various factors. These findings are helpful to understand further the comprehensive anchor behaviors and to promote the application of GIAs in offshore engineering.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136261857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of wave spectral parameters using multiple-output regression models to support the execution of marine operations 利用多输出回归模型预测波浪谱参数，以支持海洋作业的执行

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-27 DOI: 10.1115/1.4063938

Jonathan Procel, Marco Guamán, Wilson Guachamín Acero

{"title":"Prediction of wave spectral parameters using multiple-output regression models to support the execution of marine operations","authors":"Jonathan Procel, Marco Guamán, Wilson Guachamín Acero","doi":"10.1115/1.4063938","DOIUrl":"https://doi.org/10.1115/1.4063938","url":null,"abstract":"Abstract Execution of a marine operation (MO) requires coordinated actions of several vessels conducting simultaneous and sequential offshore activities. These activities have their operational limits given in terms of environmental parameters. Wave parameters are important because of their high energetic level. During the execution of a MO, forecast wave spectral parameters, i.e. significant wave height (Hs), peak period (Tp), and peak direction, are used to make an on-board decision. For critical operations, the use of forecasts can be complemented with buoy measurements. This paper proposes to use synthetic statistics of vessel dynamic responses to predict “real-time” wave spectral parameters using multi-output machine learning (ML) regression algorithms. For a case study of a vessel with no forward speed, it is observed that the random forest model predicts accurate Hs and Tp parameters. The prediction of wave direction is not very accurate but it can be corrected with on-board observations. The random forest model has good performance; it is efficient, useful for practical purposes, and comparable with other deep learning models reported in scientific literature. Findings from this research can be valuable for real-time assessment of wave spectral parameters, which are necessary to support decision-making during the execution of MOs.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of the bottom vortex on the surrounding flow characteristics of a semi-submerged rectangular cylinder under four aspect ratios 四长弦比下底部涡对半淹没矩形圆柱周围流动特性的影响

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-20 DOI: 10.1115/1.4063853

Jiaqi Zhou, Junsheng Ren, Dongyue Li, Can Tu, Weiwei Bai

引用次数: 0

Novel exact solution of elastic catenary and applications on floating wind turbine mooring systems 弹性悬链线的新精确解及其在浮式风力发电机系泊系统中的应用

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-20 DOI: 10.1115/1.4063852

Pengpeng Xu, Xing Chang, Yuan E. Liu

引用次数: 0

Dynamic Analysis of Three Alternative Mooring Systems for a Semi-submersible Wind Turbine in Intermediate Water Depth 半潜式风力机三种备选系泊系统在中等水深下的动力分析

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-20 DOI: 10.1115/1.4063854

Qun Cao, Zhengshun Cheng, Longfei Xiao, Mingyue Liu

{"title":"Dynamic Analysis of Three Alternative Mooring Systems for a Semi-submersible Wind Turbine in Intermediate Water Depth","authors":"Qun Cao, Zhengshun Cheng, Longfei Xiao, Mingyue Liu","doi":"10.1115/1.4063854","DOIUrl":"https://doi.org/10.1115/1.4063854","url":null,"abstract":"Abstract Three forms of mooring system in 60 m water depth are proposed for SPIC (Semi-submersible with Partially Inclined Columns) concept FWT (Floating Wind Turbine). One is a simple form with only catenary lines, and the others are hybrid forms including clump weights. The clumps are attached to the suspended section for Hybrid form1 and the bottom section for Hybrid form2. Hybrid form2 achieves the smallest line length and chain weight. Three proposals can be evaluated through mooring line characteristics, dynamic responses, utilization factors and cost analysis. Hybrid form2 allows for smallest pretension, and largest stiffness and nonlinearity only at large offsets. Under operational conditions, the mean surge for Hybrid form1 and Hybrid form2 is similar, but the fairlead tension is significantly smaller for Hybrid form2. Under survival condition, the clumps of Hybrid form2 are lifted up and put down, leading to large wave-frequency components of line tension. Among the three forms, the hybrid form2 can limit the FWT to the smallest offset range while also controlling the mean line tension to a level similar to the other two forms. Under normal working conditions and accidental conditions with single line broken, the maximal surge motions of FWT under the restraint of three forms all meet the design requirements. The mooring line strength of the three forms meets the requirements in ULS (ultimate limit state) and ALS (accidental limit state) analysis. Among them, the utilization coefficient of Hybrid form2 is closest to 1, demonstrating its best economic performance.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135570133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of wave force and run-up acting on an impermeable vertical circular cylinder surrounded by multiple thick porous layers 多厚多孔层包围的不透水垂直圆柱体上波浪力和爬升的分析

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-19 DOI: 10.1115/1.4063497

Sunanda Saha, Swaroop Nandan Bora

{"title":"Analysis of wave force and run-up acting on an impermeable vertical circular cylinder surrounded by multiple thick porous layers","authors":"Sunanda Saha, Swaroop Nandan Bora","doi":"10.1115/1.4063497","DOIUrl":"https://doi.org/10.1115/1.4063497","url":null,"abstract":"Abstract In this work, we analyze the effect of multiple thick porous layers, fitted around a rigid vertical circular cylinder, on the wave forces acting on the rigid structure. Using the eigenfunction expansion method in cylindrical coordinates, we derive the expressions for velocity potentials in the respective domains and finally calculate the wave force acting on the rigid structure by integrating the pressure term. Consideration of the multiple porous layers, each with different porosities, gives rise to a very basic question to answer: what will be the appropriate arrangement of the porous layers to reduce the wave impact? Hence, for numerical study, we consider three different arrangements of the porous layers. For such arrangements of the porous layers, we also analyze the effects of the other crucial parameters, such as the number and the thickness of the porous layers, on the wave force. The key finding of the analysis is that the wave force acting on the rigid structure can be minimized by increasing the number of porous layers with decreasing porosity from the innermost layer to the outermost layer. The wave breaking and forced oscillations for certain values of the porous impedance parameter are some of the interesting observations. The present model is also verified against an existing work in the literature which shows an excellent agreement.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135667261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of rate effects, temperature and moisture content on the geomechanical behavior of marine clays 速率效应、温度和含水量对海相粘土地质力学行为的影响

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-19 DOI: 10.1115/1.4063699

Vinícius Batista Godoy, Fernando Schnaid, Eduardo Cirio, Hugo Scheuermann Filho, Adriana Leonhardt, Inácio Abreu Pestana

{"title":"Influence of rate effects, temperature and moisture content on the geomechanical behavior of marine clays","authors":"Vinícius Batista Godoy, Fernando Schnaid, Eduardo Cirio, Hugo Scheuermann Filho, Adriana Leonhardt, Inácio Abreu Pestana","doi":"10.1115/1.4063699","DOIUrl":"https://doi.org/10.1115/1.4063699","url":null,"abstract":"The study of the geomechanical behavior of marine clays is a basic requirement for project optimization of the oil and natural gas industry. As part of a large-scale project, this study explored the effects of moisture content, temperature and rate effects using laboratory vane shear tests. A series of results has helped in the identification of the effects of ground freezing on the undrained shear strength. For temperatures below freezing (−2.0°C) the undrained shear strength increases with increasing water content and decreases with increasing shear rates for applied angular velocities in the range of 0.0025 to 0.015 rpm. Apparently, with the freezing of pore fluids, the shear strength is partially governed by the strength of the ice-soil particle bonds. The increase in shear rate appears to facilitate the breakage of the ice-bonds and afterwards the ice crystals reducing the viscous effects on the mobilized shear strength. Conversely, samples tested at temperatures above freezing, show an increase in undrained shear strength with the increase in the imposed angular velocity, and decreases with increasing soil moisture. Based on these studies, it is concluded that rate effects should be coupled to the influence of temperature and moisture content in design of offshore structures.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135667706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Analysis of Factors Influencing Ice Management Performance in an Experimental Marine Simulator and their Application to Decision Support System Design 海洋实验模拟器冰管理性能影响因素分析及其在决策支持系统设计中的应用

4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-19 DOI: 10.1115/1.4063617

Jonathan Soper, Erik Veitch, Rebecca Thistle, Jennifer Smith, Brian Veitch

{"title":"An Analysis of Factors Influencing Ice Management Performance in an Experimental Marine Simulator and their Application to Decision Support System Design","authors":"Jonathan Soper, Erik Veitch, Rebecca Thistle, Jennifer Smith, Brian Veitch","doi":"10.1115/1.4063617","DOIUrl":"https://doi.org/10.1115/1.4063617","url":null,"abstract":"Abstract Ice management is essential for maintaining the safety of offshore operations in Arctic regions. We present the combined results of three experiments conducted in a full-mission bridge simulator specially designed for ice management. From a quantitative analysis of the results, we infer the effect of three variables on performance: (1) experience, (2) training, and (3) Decision Support System (DSS). The results confirm that experience and training improve performance for untrained and inexperienced simulator participants. The DSS also improves performance, but with a smaller effect. Qualitative observations using vessel position heat-map diagrams and exit interviews suggested that novice participants using the DSS adopted expert strategies but carried out their tasks more slowly and with less precision. This has important consequences for the design of a future DSS used in training simulators or onboard ships. Potential improvements to the DSS design might include real-time feedback to the user, a redesign of the human–machine interface (HMI), and increasing user input and customization with a human factors focus.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135666684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and dynamic analysis of a co-existence solution between a semi-submersible offshore fish cage and a spar-type floating offshore wind turbine 半潜式海上网箱与浮式海上风力机共存方案设计与动力分析

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-17 DOI: 10.1115/1.4063806

Yu Ma, Lin Li, Muk Chen Ong, Jingzhe Jin, Biao Su

{"title":"Design and dynamic analysis of a co-existence solution between a semi-submersible offshore fish cage and a spar-type floating offshore wind turbine","authors":"Yu Ma, Lin Li, Muk Chen Ong, Jingzhe Jin, Biao Su","doi":"10.1115/1.4063806","DOIUrl":"https://doi.org/10.1115/1.4063806","url":null,"abstract":"Abstract Clean energy captured by offshore wind turbines have been widely used for supporting onshore activities. In the near future, facilities such as offshore wind turbines can also play an important role in energy transition of offshore activities. Offshore wind energy can be employed for electrifying the operations in offshore fish farms, which are traditionally supplied by diesel-engine barges/generators. Based on this motivation, this study focuses on a design of shared mooring system between a semi-submersible offshore fish cage and a spar-type floating wind turbine. A numerical model of the proposed shared-mooring system is implemented in a global response analysis software SIMA for performing fully coupled time domain simulations. The configuration of the shared mooring line is determined using an engineering approach which comprises Irvine's formulation, system eigenvalue analysis and cost estimation. Moreover, relevant case studies by altering the environmental conditions are performed. Extreme operational conditions that may give large relative motions are investigated thoroughly. The dynamic performance of the integrated system is compared with that of individual structures. The global motion of the floating wind turbine and its mooring line's tension behavior are obviously influenced by the existence of the shared line. In general, the present work investigates the feasibility of a shared-mooring system for these types of offshore structures and further gives insights about the engineering design procedure.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135993953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SERVICEABILITY LIMIT STATE ASSESSMENT OF SEMI-SUBMERSIBLE FLOATING WIND TURBINES 半潜式浮式风力发电机的使用极限状态评估

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Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-10-03 DOI: 10.1115/1.4063618

Shuaishuai Wang, Torgeir Moan

{"title":"SERVICEABILITY LIMIT STATE ASSESSMENT OF SEMI-SUBMERSIBLE FLOATING WIND TURBINES","authors":"Shuaishuai Wang, Torgeir Moan","doi":"10.1115/1.4063618","DOIUrl":"https://doi.org/10.1115/1.4063618","url":null,"abstract":"Abstract The design of a floating wind turbine (FWT) should satisfy the serviceability limit state (SLS) requirement for an efficient and safe operation throughout the entire work life. The SLS requirements are introduced by the owner/developer of the wind turbine facility to achieve production of power or an efficient operation of the facility or a first step towards ensuring safety. Currently, there are limited information about SLS requirements in design standards. This study deals with an assessment of current methods, criteria and procedure for the SLS design check with an emphasis on tilt/pitch and nacelle accelerations in view of power production and its fluctuations. Moreover, other criteria, on the borderline between serviceability and safety criteria, e.g. relating to clearance, are briefly discussed. The criteria relating to power production are illustrated in a case study with a 10-MW semi-submersible FWT considered for an offshore site in the Northern North Sea. Static and dynamic analysis in terms of serviceability are presented, discussed and applied in the case study. A good understanding of wind turbine dynamic performance associated with serviceability is essential to facilitate design decision-making. The relative contribution of wind and wave loads to the different SLS criteria is investigated. Finally, the main conclusions are summarized. I lieu of the current state of the art regarding SLS requirements for FWTs, we hope that this study provides a basis for improving design standards and guiding research and engineering practice for the semi-submersible floater design of FWTs.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135697774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0