首页 > 最新文献

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme最新文献

英文 中文
Lateral Buckling of an Elastic Pipe on a Frictional Seabed 摩擦海床上弹性管道的侧向屈曲
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2023-01-11 DOI: 10.1115/1.4056648
R. Peek
Pipelines tend to buckle laterally under thermal expansion. In existing analytical solutions by Kerr and Hobbs, it is assumed that the seabed resistance q0 to lateral pipe movements is constant in magnitude, and opposite in direction to the total displacement. Here it is opposite to the velocity instead, i.e. the seabed is taken to be frictional rather than nonlinear elastic with a V-shaped potential function. A 3-lobe (“Mode 3f”) analytical solution is provided for the frictional case, using the same approximate end-of-buckle condition v=v'=v''=0 used by Hobbs in his “Mode 3” solution for the nonlinear elastic case. For both Mode 3 and 3f solutions, the shape of the buckle does not change as it grows with increasing thermal expansion, though the scaling factors in the axial and lateral directions are different, i.e. the solutions are self-similar. A single finite element solution for the frictional case with an initial imperfection imposed by a bumper can be scaled to cover all such cases. It shows that the shape of the buckle depends on the amplitude of the initial triggering imperfection, and is close to the Mode 3f solution for very small initial imperfections. The difference between Mode 3 and 3f is significant in regard to buckle shape and the relative size of the buckle lobes, but small in regard to the maximum bending moment for a given amount of thermal expansion accommodated by the buckle.
管道在热膨胀作用下往往会发生横向弯曲。在Kerr和Hobbs现有的分析解中,假设海底对管道横向运动的阻力q0在大小上是恒定的,并且在方向上与总位移相反。在这里,它与速度相反,即海床被认为是摩擦的,而不是具有V形势函数的非线性弹性。使用Hobbs在其非线性弹性情况的“模式3”解中使用的相同近似带扣末端条件v=v'=v''=0,为摩擦情况提供了一个3叶(“模式3f”)解析解。对于模式3和3f解决方案,带扣的形状不会随着热膨胀的增加而改变,尽管轴向和横向的比例因子不同,即解决方案是自相似的。具有保险杠施加的初始缺陷的摩擦情况的单个有限元解可以按比例缩放以覆盖所有此类情况。它表明,带扣的形状取决于初始触发缺陷的振幅,并且对于非常小的初始缺陷,它接近于模式3f的解。模式3和3f之间的差异在带扣形状和带扣凸起的相对尺寸方面是显著的,但在由带扣容纳的给定热膨胀量的最大弯曲力矩方面是小的。
{"title":"Lateral Buckling of an Elastic Pipe on a Frictional Seabed","authors":"R. Peek","doi":"10.1115/1.4056648","DOIUrl":"https://doi.org/10.1115/1.4056648","url":null,"abstract":"\u0000 Pipelines tend to buckle laterally under thermal expansion. In existing analytical solutions by Kerr and Hobbs, it is assumed that the seabed resistance q0 to lateral pipe movements is constant in magnitude, and opposite in direction to the total displacement. Here it is opposite to the velocity instead, i.e. the seabed is taken to be frictional rather than nonlinear elastic with a V-shaped potential function. A 3-lobe (“Mode 3f”) analytical solution is provided for the frictional case, using the same approximate end-of-buckle condition v=v'=v''=0 used by Hobbs in his “Mode 3” solution for the nonlinear elastic case. For both Mode 3 and 3f solutions, the shape of the buckle does not change as it grows with increasing thermal expansion, though the scaling factors in the axial and lateral directions are different, i.e. the solutions are self-similar. A single finite element solution for the frictional case with an initial imperfection imposed by a bumper can be scaled to cover all such cases. It shows that the shape of the buckle depends on the amplitude of the initial triggering imperfection, and is close to the Mode 3f solution for very small initial imperfections. The difference between Mode 3 and 3f is significant in regard to buckle shape and the relative size of the buckle lobes, but small in regard to the maximum bending moment for a given amount of thermal expansion accommodated by the buckle.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42334165","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
Assessment of the hydrodynamic performance of an Oscillating Water Column device in front of a V-shaped vertical wall v型垂直壁面前振荡水柱装置的水动力性能评价
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2023-01-10 DOI: 10.1115/1.4056643
D. Konispoliatis
In this work, an Oscillating Water Column (OWC) device is considered placed in front of a V-shaped vertical breakwater. The idea conceived, is based on the amplified wave power absorption due to the wave interactions originated from the presence of the breakwater. A theoretical analysis is presented in the realm of linear potential theory, based on the solution of proper diffraction, and radiation problems in the frequency domain, using the eigenfunction expansion method, the method of images and the multiple scattering approach. Optimum absorption efficiency is examined taking into consideration the characteristics of the Power Take Off (PTO) system and the air compressibility. Numerical results are presented and discussed in terms of the expected power absorption. The effect of the distance between the OWC and the vertical walls, the breakwater's forming angle, and the wave heading angle, is examined to demonstrate the enhanced absorption ability of the device. It is concluded that the device's efficiency is strongly dependent on the position of the OWC in front of the walls, as well as the angle of the wave impact, and should be taken into account when determining the optimum device parameters for maximization of its performance.
在这项工作中,振荡水柱(OWC)装置被考虑放置在V形垂直防波堤的前面。设想的想法是基于防波堤的存在引起的波浪相互作用所产生的放大的波浪功率吸收。基于固有衍射和频域辐射问题的求解,利用本征函数展开法、图像法和多重散射法,在线性势理论领域进行了理论分析。考虑到动力输出(PTO)系统的特性和空气压缩性,对最佳吸收效率进行了检验。给出了数值结果,并根据预期功率吸收进行了讨论。研究了OWC与垂直墙之间的距离、防波堤的形成角和波浪航向角的影响,以证明该装置增强了吸收能力。得出的结论是,该设备的效率在很大程度上取决于OWC在墙前的位置以及波浪冲击的角度,在确定最佳设备参数时应将其考虑在内,以使其性能最大化。
{"title":"Assessment of the hydrodynamic performance of an Oscillating Water Column device in front of a V-shaped vertical wall","authors":"D. Konispoliatis","doi":"10.1115/1.4056643","DOIUrl":"https://doi.org/10.1115/1.4056643","url":null,"abstract":"\u0000 In this work, an Oscillating Water Column (OWC) device is considered placed in front of a V-shaped vertical breakwater. The idea conceived, is based on the amplified wave power absorption due to the wave interactions originated from the presence of the breakwater. A theoretical analysis is presented in the realm of linear potential theory, based on the solution of proper diffraction, and radiation problems in the frequency domain, using the eigenfunction expansion method, the method of images and the multiple scattering approach. Optimum absorption efficiency is examined taking into consideration the characteristics of the Power Take Off (PTO) system and the air compressibility. Numerical results are presented and discussed in terms of the expected power absorption. The effect of the distance between the OWC and the vertical walls, the breakwater's forming angle, and the wave heading angle, is examined to demonstrate the enhanced absorption ability of the device. It is concluded that the device's efficiency is strongly dependent on the position of the OWC in front of the walls, as well as the angle of the wave impact, and should be taken into account when determining the optimum device parameters for maximization of its performance.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44862291","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: 1
AUTOMATIC CLUSTERING OF METOCEAN CONDITIONS IN THE BRAZILIAN COAST 巴西海岸海洋气象条件的自动聚类
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2023-01-04 DOI: 10.1115/1.4056618
Felipe Marino Moreno, E. Tannuri, F. G. Cozman
This paper introduces a pipeline that assembles a dataset of metocean conditions consisting of wind, wave and surface currents, and then clusters this data to find the characteristic environmental conditions of each region in the Brazilian coast and the associated Exclusive Economic Zone. Clustering uses the Partitioning Around Medoids algorithm with the silhouette coefficient. As examples, we first present an analysis for the whole Exclusive Economic Zone and then a focused analysis around the Santos port in Southeastern Brazil.
本文介绍了一种管道,该管道组装了由风、波浪和地表流组成的海洋气象条件数据集,然后对这些数据进行聚类,以找到巴西海岸和相关专属经济区每个区域的特征环境条件。聚类使用具有轮廓系数的Medoids周围划分算法。作为例子,我们首先对整个专属经济区进行了分析,然后围绕巴西东南部的桑托斯港进行了重点分析。
{"title":"AUTOMATIC CLUSTERING OF METOCEAN CONDITIONS IN THE BRAZILIAN COAST","authors":"Felipe Marino Moreno, E. Tannuri, F. G. Cozman","doi":"10.1115/1.4056618","DOIUrl":"https://doi.org/10.1115/1.4056618","url":null,"abstract":"\u0000 This paper introduces a pipeline that assembles a dataset of metocean conditions consisting of wind, wave and surface currents, and then clusters this data to find the characteristic environmental conditions of each region in the Brazilian coast and the associated Exclusive Economic Zone. Clustering uses the Partitioning Around Medoids algorithm with the silhouette coefficient. As examples, we first present an analysis for the whole Exclusive Economic Zone and then a focused analysis around the Santos port in Southeastern Brazil.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42165163","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
A code-to-code comparison for dynamic modelling and response analysis of offshore wind turbine blade mating process 海上风力涡轮机叶片匹配过程动态建模和响应分析的代码对代码比较
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2023-01-04 DOI: 10.1115/1.4056617
Saravanan Bhaskaran, A. Verma, Shuai Yuan, Zhiyu Jiang, K. Halse
Offshore wind turbine blade installation using jack up crane vessel is a challenging task. Wave and wind induced loads on the installation system can cause large relative motion between the blade root and the hub during the mating process. Currently, several numerical tools are used to analyse such critical global motion responses; however, the industry suffers from lack of experiments and full-scale measurements to validate the accuracy of these results. Consequently, a code-to-code comparison exercise becomes critical as it allows comparing different numerical tools for reliable prediction and verification of results. In the present paper, a numerical model of the offshore wind turbine blade mating process using a jack-up crane vessel is developed in OrcaFlex, and a code-to-code comparison is performed against SIMA; both these tools are immensely used in the industry for modelling marine operations. Different comparisons are made between both the tools such as: (1) modal analyses of the jack-up vessel and the blade lifting gear, (2) time-domain analysis of the fully coupled installation vessel-crane-blade system, and (3) a comprehensive sensitivity study based on different seed numbers and simulation periods. The results of the study show a good agreement between both the tools with a deviation of less than 3% in terms of modal analysis and less than 5% variation in time domain results. Further, the paper provides modelling guidelines for the industry practitioners that heavily rely on both the tools for modelling marine operations.
使用自升式起重船安装海上风力涡轮机叶片是一项具有挑战性的任务。在配合过程中,安装系统上的波浪和风引起的载荷会导致叶根和轮毂之间的较大相对运动。目前,有几种数值工具用于分析这种临界全局运动响应;然而,该行业缺乏实验和全尺寸测量来验证这些结果的准确性。因此,代码对代码的比较练习变得至关重要,因为它可以比较不同的数字工具,以可靠地预测和验证结果。本文在OrcaFlex中开发了一个使用自升式起重船的海上风机叶片匹配过程的数值模型,并与SIMA进行了代码对代码的比较;这两种工具在海洋作业建模行业中都得到了广泛应用。这两种工具之间进行了不同的比较,如:(1)自升式船舶和叶片起重装置的模态分析,(2)全耦合安装船吊叶片系统的时域分析,以及(3)基于不同种子数和模拟周期的综合灵敏度研究。研究结果表明,两种工具之间的一致性很好,模态分析的偏差小于3%,时域结果的变化小于5%。此外,该文件为严重依赖这两种工具进行海洋作业建模的行业从业者提供了建模指南。
{"title":"A code-to-code comparison for dynamic modelling and response analysis of offshore wind turbine blade mating process","authors":"Saravanan Bhaskaran, A. Verma, Shuai Yuan, Zhiyu Jiang, K. Halse","doi":"10.1115/1.4056617","DOIUrl":"https://doi.org/10.1115/1.4056617","url":null,"abstract":"\u0000 Offshore wind turbine blade installation using jack up crane vessel is a challenging task. Wave and wind induced loads on the installation system can cause large relative motion between the blade root and the hub during the mating process. Currently, several numerical tools are used to analyse such critical global motion responses; however, the industry suffers from lack of experiments and full-scale measurements to validate the accuracy of these results. Consequently, a code-to-code comparison exercise becomes critical as it allows comparing different numerical tools for reliable prediction and verification of results. In the present paper, a numerical model of the offshore wind turbine blade mating process using a jack-up crane vessel is developed in OrcaFlex, and a code-to-code comparison is performed against SIMA; both these tools are immensely used in the industry for modelling marine operations. Different comparisons are made between both the tools such as: (1) modal analyses of the jack-up vessel and the blade lifting gear, (2) time-domain analysis of the fully coupled installation vessel-crane-blade system, and (3) a comprehensive sensitivity study based on different seed numbers and simulation periods. The results of the study show a good agreement between both the tools with a deviation of less than 3% in terms of modal analysis and less than 5% variation in time domain results. Further, the paper provides modelling guidelines for the industry practitioners that heavily rely on both the tools for modelling marine operations.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42352818","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
Wave effects on vortex-induced vibrations of a top-tensioned riser 波浪对顶张立管涡激振动的影响
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-12-19 DOI: 10.1115/1.4056521
Decao Yin, Jie Wu, H. Lie, E. Passano, Svein Savik, G. Grytøyr, M. Tognarelli, T. Andersen, R. Igland, D. Karunakaran, Collin Gaskill
Offshore drilling risers, top-tensioned risers and many production risers are top tensioned, connecting the vessel and seabed via joints. External loads such as currents, waves and vessel motions introduce cyclic loads and motions on riser sections, which may shorten the service life due to accumulated fatigue damage. Dynamic responses under combined currents and waves are more complicated than vortex-induced vibrations (VIV) due to pure currents, and it is not fully understood. Several model test campaigns on top-tensioned riser (TTR) have been carried out at SINTEF Ocean (former MARINTEK) during the past decades. Currents, waves and vessel motions were modeled, and the riser model responses were measured. In this study, selected cases from such model tests are analysed, and used to validate a semi-empirical time domain VIV prediction tool – VIVANA-TD. A better understanding of the dynamic responses of TTR under combined currents and waves has been achieved. By comparing the results from numerical simulation using VIVANA-TD and model test measurements, validity and limitation of the time domain tool have been investigated. Important features that need to be considered are discussed. The experience gained from the present study establishes a good basis for VIV and wave load prediction of full-scale TTRs under combined currents and waves where the uncertainty of VIV prediction is further reduced.
海上钻井立管、顶部张紧立管和许多生产立管都是顶部张紧的,通过接头连接船只和海床。电流、波浪和船舶运动等外部载荷会在立管段上引入循环载荷和运动,这可能会由于累积的疲劳损伤而缩短使用寿命。与纯电流引起的涡激振动(VIV)相比,电流和波浪组合下的动态响应更为复杂,而且还没有完全理解。在过去的几十年里,SINTEF Ocean(前MARINTEK)已经对顶张立管(TTR)进行了几次模型试验。对海流、波浪和船舶运动进行了建模,并测量了立管模型的响应。在本研究中,分析了此类模型测试中的选定案例,并用于验证半经验时域VIV预测工具——VIVANA-TD。对TTR在组合电流和波浪作用下的动态响应有了更好的理解。通过比较VIVANA-TD数值模拟和模型试验测量的结果,研究了时域工具的有效性和局限性。讨论了需要考虑的重要特性。从本研究中获得的经验为全尺寸TTR在组合电流和波浪下的VIV和波浪载荷预测奠定了良好的基础,从而进一步降低了VIV预测的不确定性。
{"title":"Wave effects on vortex-induced vibrations of a top-tensioned riser","authors":"Decao Yin, Jie Wu, H. Lie, E. Passano, Svein Savik, G. Grytøyr, M. Tognarelli, T. Andersen, R. Igland, D. Karunakaran, Collin Gaskill","doi":"10.1115/1.4056521","DOIUrl":"https://doi.org/10.1115/1.4056521","url":null,"abstract":"\u0000 Offshore drilling risers, top-tensioned risers and many production risers are top tensioned, connecting the vessel and seabed via joints. External loads such as currents, waves and vessel motions introduce cyclic loads and motions on riser sections, which may shorten the service life due to accumulated fatigue damage. Dynamic responses under combined currents and waves are more complicated than vortex-induced vibrations (VIV) due to pure currents, and it is not fully understood. Several model test campaigns on top-tensioned riser (TTR) have been carried out at SINTEF Ocean (former MARINTEK) during the past decades. Currents, waves and vessel motions were modeled, and the riser model responses were measured. In this study, selected cases from such model tests are analysed, and used to validate a semi-empirical time domain VIV prediction tool – VIVANA-TD. A better understanding of the dynamic responses of TTR under combined currents and waves has been achieved. By comparing the results from numerical simulation using VIVANA-TD and model test measurements, validity and limitation of the time domain tool have been investigated. Important features that need to be considered are discussed. The experience gained from the present study establishes a good basis for VIV and wave load prediction of full-scale TTRs under combined currents and waves where the uncertainty of VIV prediction is further reduced.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44892688","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 a Moored and Articulated Multibody Offshore System in Steep Waves 系泊和铰接式多体海洋系统在巨浪中的分析
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-12-19 DOI: 10.1115/1.4056522
Changqing Jiang, Peng Xu, O. el Moctar, Guiyong Zhang
Wave-induced motions of and loads on a moored and articulated multibody offshore structure are numerically analyzed, where a coupled mooring-joint-viscous flow solver was used to account for mooring dynamics, joint restrictions, nonlinear rigid body motions, and viscous flow effects. The considered concepts consisted of two MFSs connected by two types of connections, namely a rigid joint and a flexible joint, and positioned by four symmetrical catenary mooring lines. The analyzed responses comprised multibody motions as well as associated forces acting in the hinged joints and the mooring lines. Results indicated that surge motions of the articulated bodies were almost identical to each other, whereas the effects of the joint on heave motions were not pronounced. However, highly dynamic pitch motions between two hinged MFSs were observed. Apart from motion responses, forces acting on the hinged joint and the mooring lines were estimated. The coupled mooring-joint-viscous flow solver demonstrated its capability to predict wave-induced motions of and loads on a moored multibody offshore structure articulated by various types of joints.
对系泊和铰接多体海上结构的波浪诱导运动和载荷进行了数值分析,其中使用耦合系泊关节粘性流求解器来考虑系泊动力学、关节限制、非线性刚体运动和粘性流效应。所考虑的概念包括两个MFS,它们由两种类型的连接件连接,即刚性接头和柔性接头,并由四条对称的悬链线系泊缆定位。分析的响应包括多体运动以及作用在铰接接头和系泊缆中的相关力。结果表明,铰接体的涌浪运动基本相同,而关节对升沉运动的影响并不明显。然而,观察到两个铰接MFS之间的高度动态俯仰运动。除了运动响应外,还估算了作用在铰接接头和系泊缆上的力。耦合系泊关节粘性流求解器证明了其预测由各种类型的关节铰接的系泊多体海上结构的波浪诱导运动和载荷的能力。
{"title":"Analysis of a Moored and Articulated Multibody Offshore System in Steep Waves","authors":"Changqing Jiang, Peng Xu, O. el Moctar, Guiyong Zhang","doi":"10.1115/1.4056522","DOIUrl":"https://doi.org/10.1115/1.4056522","url":null,"abstract":"\u0000 Wave-induced motions of and loads on a moored and articulated multibody offshore structure are numerically analyzed, where a coupled mooring-joint-viscous flow solver was used to account for mooring dynamics, joint restrictions, nonlinear rigid body motions, and viscous flow effects. The considered concepts consisted of two MFSs connected by two types of connections, namely a rigid joint and a flexible joint, and positioned by four symmetrical catenary mooring lines. The analyzed responses comprised multibody motions as well as associated forces acting in the hinged joints and the mooring lines. Results indicated that surge motions of the articulated bodies were almost identical to each other, whereas the effects of the joint on heave motions were not pronounced. However, highly dynamic pitch motions between two hinged MFSs were observed. Apart from motion responses, forces acting on the hinged joint and the mooring lines were estimated. The coupled mooring-joint-viscous flow solver demonstrated its capability to predict wave-induced motions of and loads on a moored multibody offshore structure articulated by various types of joints.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49450020","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: 2
2D Planar Modelling of the Depth Control of a Subsea Shuttle Tanker 海底穿梭油轮深度控制的二维平面建模
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-12-06 DOI: 10.1115/1.4056418
Yucong Ma, Y. Xing, D. Sui, M. Ong, T. Hemmingsen
A novel subsea shuttle tanker (SST) concept was proposed as a cost-effective alternative to subsea pipelines and tanker ships for liquid CO2 transportation between a source facility and a subsea well. The SST will be deployed to transport CO2 to marginal subsea fields with an annual CO2 storage capacity around 1 million tonnes. A baseline design was recently developed by the authors to support research work aimed at assessing large and ultra-efficient subsea cargo drone technology. One crucial aspect is the development of SST's operation envelope, i.e., the safe depth versus speed regions. The development of this envelope entails comprehensive and detailed studies of SST's dynamic load-effects under all expected operating scenarios which in the early concept development phase can be performed using suitable computational models. In this technical brief, the initial development of such a model is unveiled. This fully coupled 2D planar model considers the most relevant load-effects which are from hydrodynamics, hydrostatics, and control surface induced loads. The most important features of the model such as the derivation of hydrodynamic derivatives and model verification are also discussed. As an example, this model is then used to study the depth control problem which is a key aspect in the determination of the safety operational envelope. The results show that unsuitable control schemes that do not look ahead in the trajectory lead to undesirable results. In contrast, a feed-forward heading control method achieves a good and fast control response.
提出了一种新型的海底穿梭油轮(SST)概念,作为海底管道和油轮的一种经济有效的替代方案,用于在源设施和海底井之间运输液态二氧化碳。SST将用于将二氧化碳输送到边缘海底油田,年二氧化碳储存能力约为100万吨。作者最近开发了一种基线设计,以支持旨在评估大型超高效水下货运无人机技术的研究工作。一个关键的方面是SST的操作包络的发展,即安全深度与速度区域。该包络线的开发需要全面和详细地研究海温在所有预期操作场景下的动态负载效应,在早期概念开发阶段可以使用合适的计算模型进行研究。在这个技术简报中,这种模型的初步开发是公开的。这个完全耦合的二维平面模型考虑了来自流体力学、静力学和控制面诱导载荷的最相关的载荷效应。讨论了该模型最重要的特点,如水动力导数的推导和模型的验证。以该模型为例,研究了确定安全运行包络线的关键问题——深度控制问题。结果表明,不考虑轨迹前瞻的不合适的控制方案会导致不理想的结果。相比之下,前馈航向控制方法获得了良好而快速的控制响应。
{"title":"2D Planar Modelling of the Depth Control of a Subsea Shuttle Tanker","authors":"Yucong Ma, Y. Xing, D. Sui, M. Ong, T. Hemmingsen","doi":"10.1115/1.4056418","DOIUrl":"https://doi.org/10.1115/1.4056418","url":null,"abstract":"\u0000 A novel subsea shuttle tanker (SST) concept was proposed as a cost-effective alternative to subsea pipelines and tanker ships for liquid CO2 transportation between a source facility and a subsea well. The SST will be deployed to transport CO2 to marginal subsea fields with an annual CO2 storage capacity around 1 million tonnes. A baseline design was recently developed by the authors to support research work aimed at assessing large and ultra-efficient subsea cargo drone technology. One crucial aspect is the development of SST's operation envelope, i.e., the safe depth versus speed regions. The development of this envelope entails comprehensive and detailed studies of SST's dynamic load-effects under all expected operating scenarios which in the early concept development phase can be performed using suitable computational models. In this technical brief, the initial development of such a model is unveiled. This fully coupled 2D planar model considers the most relevant load-effects which are from hydrodynamics, hydrostatics, and control surface induced loads. The most important features of the model such as the derivation of hydrodynamic derivatives and model verification are also discussed. As an example, this model is then used to study the depth control problem which is a key aspect in the determination of the safety operational envelope. The results show that unsuitable control schemes that do not look ahead in the trajectory lead to undesirable results. In contrast, a feed-forward heading control method achieves a good and fast control response.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48020793","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
Verification and Validation of CFD Simulations of a FOWT Semi-submersible under Bichromatic and Random Waves FOWT半潜器在双色波和随机波作用下CFD模拟的验证
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-12-06 DOI: 10.1115/1.4056421
Yu Wang, Hamn-Ching Chen
In the present work an extensive verification and validation study is performed to evaluate the accuracy and credibility for CFD simulations of the hydrodynamic responses of a semi-submersible Floating Offshore Wind Turbine (FOWT) platform under bichromatic waves and random waves. A dynamic mooring model is coupled with the CFD code to accurately simulate the mooring system. For the bichromatic wave case, the surge, heave and pitch RAOs at wave frequencies, mean surge offset and mean surge force of the semi-submersible platform are investigated. The numerical uncertainties of the above metrics are quantified, which are primarily sourced from the discretization uncertainty. For the random wave case, the surge, heave and pitch PSD sums in wave frequency range and low frequency range are validated against the experimental results. The numerical uncertainty derived from the bichromatic wave case is applied in the validation of the random wave case. The PSD sums in wave frequency range have achieved the validation within the validation uncertainty. Though the PSD sums in low frequency range are under-predicted, the results with the utilization of the CFD code agree more with the experimental value than the mid-fidelity tools.
在本工作中,进行了广泛的验证和验证研究,以评估半潜式浮动海上风力涡轮机(FOWT)平台在双色波和随机波下的流体动力学响应CFD模拟的准确性和可信度。将动态系泊模型与CFD代码相结合,以精确模拟系泊系统。对于双色波情况,研究了半潜式平台在波浪频率、平均涌浪偏移和平均涌浪力下的涌浪、升沉和纵摇RAO。对上述度量的数值不确定性进行了量化,这些不确定性主要来源于离散化不确定性。对于随机波浪情况,根据实验结果验证了波浪频率范围和低频范围内的浪涌、升沉和纵摇PSD总和。从双色波情况导出的数值不确定性应用于随机波情况的验证。波频率范围内的PSD总和在验证不确定度范围内实现了验证。尽管低频范围内的PSD总和预测不足,但与高保真度工具相比,CFD代码的使用结果更符合实验值。
{"title":"Verification and Validation of CFD Simulations of a FOWT Semi-submersible under Bichromatic and Random Waves","authors":"Yu Wang, Hamn-Ching Chen","doi":"10.1115/1.4056421","DOIUrl":"https://doi.org/10.1115/1.4056421","url":null,"abstract":"\u0000 In the present work an extensive verification and validation study is performed to evaluate the accuracy and credibility for CFD simulations of the hydrodynamic responses of a semi-submersible Floating Offshore Wind Turbine (FOWT) platform under bichromatic waves and random waves. A dynamic mooring model is coupled with the CFD code to accurately simulate the mooring system. For the bichromatic wave case, the surge, heave and pitch RAOs at wave frequencies, mean surge offset and mean surge force of the semi-submersible platform are investigated. The numerical uncertainties of the above metrics are quantified, which are primarily sourced from the discretization uncertainty. For the random wave case, the surge, heave and pitch PSD sums in wave frequency range and low frequency range are validated against the experimental results. The numerical uncertainty derived from the bichromatic wave case is applied in the validation of the random wave case. The PSD sums in wave frequency range have achieved the validation within the validation uncertainty. Though the PSD sums in low frequency range are under-predicted, the results with the utilization of the CFD code agree more with the experimental value than the mid-fidelity tools.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49413129","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: 1
UiS Subsea-Freight Glider: A Large Buoyancy-Driven Autonomous Cargo Glider 美国水下货运滑翔机:一种大型浮力驱动的自主货运滑翔机
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-12-06 DOI: 10.1115/1.4056419
Usman Ahmad, Y. Xing, Yucong Ma
This work presents the baseline design for the autonomous subsea vehicle capable of traveling at a lower speed of 1 m/s with an operating range of 400 km. Owing to UiS subsea-freight glider's (USFG) exceedingly economical and unique propulsion system, it can transport various types of cargo over variable distances. The primary use-case scenario for the USFG is to serve as an autonomous transport vessel to carry CO2 from land-based facilities to subsea injection sites. This allows the USFG to serve as a substitute for weather-dependent cargo tankers and underwater pipelines. The length of the USFG is 50.25 m along with a beam of 5.50 m, which allows the vessel to carry 518 m3 of CO2 while serving the storage needs of the carbon capture and storage (CCS) ventures on the Norwegian continental shelf. The USFG is powered by battery cells, and it only consumes a little less than 8 kW of electrical power. Along with the mechanical design of the USFG, the control design is also presented in the final part of the paper. The manoeuvring model of the USFG is presented along with two operational case studies. For this purpose, an LQR and PID-based control system is designed, and a detailed comparison study is also shown in terms of tuning and response characteristics for both controllers.
这项工作提出了自主水下航行器的基线设计,能够以1米/秒的较低速度行驶,作业范围为400公里。由于美国水下货运滑翔机(USFG)极其经济和独特的推进系统,它可以运输各种类型的货物在不同的距离。USFG的主要用例是作为一艘自主运输船,将二氧化碳从陆地设施运送到海底注入点。这使得USFG可以作为依赖天气的油轮和水下管道的替代品。USFG的长度为50.25米,横梁为5.50米,这使得该船能够携带518立方米的二氧化碳,同时满足挪威大陆架上碳捕集与封存(CCS)企业的储存需求。USFG由电池提供动力,它只消耗不到8千瓦的电力。在进行USFG的机械设计的同时,本文的最后部分还进行了控制设计。提出了美国联邦政府的机动模型以及两个操作案例研究。为此,设计了一种基于LQR和pid的控制系统,并对两种控制器的调谐特性和响应特性进行了详细的比较研究。
{"title":"UiS Subsea-Freight Glider: A Large Buoyancy-Driven Autonomous Cargo Glider","authors":"Usman Ahmad, Y. Xing, Yucong Ma","doi":"10.1115/1.4056419","DOIUrl":"https://doi.org/10.1115/1.4056419","url":null,"abstract":"\u0000 This work presents the baseline design for the autonomous subsea vehicle capable of traveling at a lower speed of 1 m/s with an operating range of 400 km. Owing to UiS subsea-freight glider's (USFG) exceedingly economical and unique propulsion system, it can transport various types of cargo over variable distances. The primary use-case scenario for the USFG is to serve as an autonomous transport vessel to carry CO2 from land-based facilities to subsea injection sites. This allows the USFG to serve as a substitute for weather-dependent cargo tankers and underwater pipelines. The length of the USFG is 50.25 m along with a beam of 5.50 m, which allows the vessel to carry 518 m3 of CO2 while serving the storage needs of the carbon capture and storage (CCS) ventures on the Norwegian continental shelf. The USFG is powered by battery cells, and it only consumes a little less than 8 kW of electrical power. Along with the mechanical design of the USFG, the control design is also presented in the final part of the paper. The manoeuvring model of the USFG is presented along with two operational case studies. For this purpose, an LQR and PID-based control system is designed, and a detailed comparison study is also shown in terms of tuning and response characteristics for both controllers.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47989017","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: 1
Weather Window Analysis in Operations and Maintenance Policies for Offshore Floating Multi-Purpose Platforms 海上浮动多用途平台运维政策中的天气窗口分析
IF 1.6 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-11-30 DOI: 10.1115/1.4056344
Taemin Heo, Ding-Peng Liu, L. Manuel
In an emerging “blue economy,” the use of large multipurpose floating platforms in the open ocean is being considered. Such platforms could possibly support a diversified range of commercial activities including energy generation, aquaculture, seabed mining, transport, tourism, and sea-based laboratories. A Markov Decision Process (MDP) framework is proposed to deal with operations and maintenance issues that are inevitable; challenges arise from the complex stochastic weather conditions that need to be accounted for. Using data as well as contrasting synthetic simulations of relevant weather variables, we demonstrate the robustness/versatility of the MDP model. Two case studies-one involving constant and another involving time-dependent downtime costs-are conducted to demonstrate how the proposed MDP framework incorporates weather patterns from available data and can offer optimal policies for distinct metocean conditions (i.e., temporal variations in the weather). A realistic example that illustrates the implementation of the proposed framework for multiple O&M issues involving salmon net pens and wave energy converters demonstrates how our optimal policies can minimize O&M costs and maximize crew safety almost as if the true future were known for scheduling.
在新兴的“蓝色经济”中,正在考虑在公海上使用大型多用途浮动平台。这种平台可能支持各种各样的商业活动,包括发电、水产养殖、海底采矿、运输、旅游和海上实验室。提出了一种马尔可夫决策过程框架来处理不可避免的运维问题;挑战来自需要考虑的复杂的随机天气条件。使用数据以及相关天气变量的对比综合模拟,我们证明了MDP模型的鲁棒性/多功能性。两个案例研究(一个涉及恒定成本,另一个涉及与时间相关的停机成本)演示了拟议的MDP框架如何结合来自可用数据的天气模式,并为不同的海洋气象条件(即天气的时间变化)提供最佳策略。一个现实的例子,说明了多个运维问题的拟议框架的实施,包括鲑鱼网围栏和波浪能转换器,证明了我们的最佳策略如何最大限度地降低运维成本,最大限度地提高船员的安全,就像真正的未来是众所周知的调度一样。
{"title":"Weather Window Analysis in Operations and Maintenance Policies for Offshore Floating Multi-Purpose Platforms","authors":"Taemin Heo, Ding-Peng Liu, L. Manuel","doi":"10.1115/1.4056344","DOIUrl":"https://doi.org/10.1115/1.4056344","url":null,"abstract":"\u0000 In an emerging “blue economy,” the use of large multipurpose floating platforms in the open ocean is being considered. Such platforms could possibly support a diversified range of commercial activities including energy generation, aquaculture, seabed mining, transport, tourism, and sea-based laboratories. A Markov Decision Process (MDP) framework is proposed to deal with operations and maintenance issues that are inevitable; challenges arise from the complex stochastic weather conditions that need to be accounted for. Using data as well as contrasting synthetic simulations of relevant weather variables, we demonstrate the robustness/versatility of the MDP model. Two case studies-one involving constant and another involving time-dependent downtime costs-are conducted to demonstrate how the proposed MDP framework incorporates weather patterns from available data and can offer optimal policies for distinct metocean conditions (i.e., temporal variations in the weather). A realistic example that illustrates the implementation of the proposed framework for multiple O&M issues involving salmon net pens and wave energy converters demonstrates how our optimal policies can minimize O&M costs and maximize crew safety almost as if the true future were known for scheduling.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42170129","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
期刊
Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1