Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme最新文献_第7页

Finding dangerous waves – Review of methods to obtain wave impact design loads for marine structures 寻找危险的波浪——获得海洋结构波浪冲击设计载荷的方法综述

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-02-09 DOI: 10.1115/1.4056888

S. V. van Essen, H. Seyffert

引用次数: 2

Estimation of Subsea Line Structure Behavior Based on Sequential Data Assimilation with Distributed Sensing 基于分布式传感序列数据同化的海底线结构行为估计

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-02-06 DOI: 10.1115/1.4056846

S. Kojima, Ryota Wada, H. Murayama

引用次数: 0

PHYSICAL TESTING CAMPAIGN FACILITATING VALIDATION OF WELDED STEEL STRUCTURES BY NON-LINEAR FINITE ELEMENT ANALYSIS 物理测试活动促进了非线性有限元分析对焊接钢结构的验证

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-30 DOI: 10.1115/1.4056785

M. Eriksson, Magnus Nyberg, Michael Andersen, Jørgen Nielsen, Jesper Tychsen

{"title":"PHYSICAL TESTING CAMPAIGN FACILITATING VALIDATION OF WELDED STEEL STRUCTURES BY NON-LINEAR FINITE ELEMENT ANALYSIS","authors":"M. Eriksson, Magnus Nyberg, Michael Andersen, Jørgen Nielsen, Jesper Tychsen","doi":"10.1115/1.4056785","DOIUrl":"https://doi.org/10.1115/1.4056785","url":null,"abstract":"\u0000 Non-linear finite element analysis is a powerful tool for determination of ultimate capacities of steel components. To produce reliable predictions of structural strength, it is of fundamental importance that non-linear finite element analyses are based on a validated methodology. This paper focuses on physical test campaigns, which are designed with the purpose of providing an experimental foundation for calibrated and validated non-linear finite element assessments of plated components, which form part of typical offshores structures. The experimental work discussed in the current paper is a continuation of the experiments of tubular members and joints, which were carried out by Maersk Oil in the late nineties. The objective is that the two-test campaigns together shall allow for development of a non-linear finite element methodology with calibrated failure criteria providing either characteristic or mean level of capacity/response for the main details in typical offshore structures. This paper particularly focuses on the testing campaign complete in 2017 which forms the basis for the calibration of the failure criteria covering plated sections.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46451566","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

Mitigation of Wave Impact on Sea Wall by a Floating Elastic Plate and a Porous Structure 浮动弹性板与多孔结构减轻波浪对海堤的冲击

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-30 DOI: 10.1115/1.4056787

G. Sahoo, S. Singla, S. C. Martha

{"title":"Mitigation of Wave Impact on Sea Wall by a Floating Elastic Plate and a Porous Structure","authors":"G. Sahoo, S. Singla, S. C. Martha","doi":"10.1115/1.4056787","DOIUrl":"https://doi.org/10.1115/1.4056787","url":null,"abstract":"\u0000 The purpose of the present study is to reduce the high wave load on a sea wall by utilizing an elastic plate (EP) kept at fixed distance from a porous structure (PS). Thin plate theory is used to model the flow past EP, while Sollit and Cross theory is used to model the flow past PS. A linear potential theory-based analytical solution to the current problem is developed using the eigenfunction expansion technique. To understand the effect of PS and EP in creating tranquility zone and minimum wave loads on the rigid wall, horizontal wave force on the wall, reflection coefficient, dissipation coefficient and free surface elevation are computed and analyzed for different values of width and friction factor of PS, flexural rigidity and length of EP, angle of incidence, and distance between PS and EP, and the distance between EP and rigid wall. The study demonstrates that both structures considerably reduce the stress on the rigid wall and the wave reflection. It is found that the force on the wall shifted to the left as the width and frictional factor of PS increased. It is observed that PS effectively minimises the free surface elevation in the region between EP and the wall. It is also found that an effective tranquility zone may be produced, which will put less wave force on the rigid wall, with sufficient spacing between PS and EP, and EP and wall. The given model is expected to assist in preserving various coastal assets significantly.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48101534","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

American and European Hydrostatic Tubular Beam-Column Equation Comparisons 欧美静压管梁柱方程比较

4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-27 DOI: 10.1115/1.4056620

Albert Ku, Mark Richmond

引用次数: 0

An improved method for predicting roll damping and excessive acceleration for a ship with moonpool based on CFD method 基于CFD方法的月池船舶横摇阻尼和超加速度预测改进方法

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-23 DOI: 10.1115/1.4056737

F. Duan, N. Ma, X. Gu, Yao-hua Zhou

{"title":"An improved method for predicting roll damping and excessive acceleration for a ship with moonpool based on CFD method","authors":"F. Duan, N. Ma, X. Gu, Yao-hua Zhou","doi":"10.1115/1.4056737","DOIUrl":"https://doi.org/10.1115/1.4056737","url":null,"abstract":"\u0000 Excessive acceleration is one of the stability failure modes involving large roll motion of ships. The overset method is applied to solve the six degrees-of-freedom motion of the ship with moonpool in beam waves. Based on computational fluid dynamics (CFD) method, the improved method of considering the roll damping of square moonpool are proposed. The improved method of considering moonpool damping is used in vulnerability assessment for excessive acceleration. The comparative analysis of the Level 1 and Level 2 vulnerability assessment of the excessive acceleration of a ship with moonpool is completed. The influence of moonpool on the vulnerability assessment of excessive acceleration is studied by comparing with the model test results. The results show that the main factor affecting the estimation accuracy of lateral acceleration of the ship is the accuracy of roll amplitude calculation. The existence of moonpool will reduce the roll damping coefficient of the ship. The improved methods proposed in this paper can effectively improve the estimation of lateral acceleration of ships with moonpool in the Level 1 vulnerability criteria and increase the safety margin in the Level 2 vulnerability assessment. In the direct stability assessment, the CFD method can simulate the large-amplitude roll motion of the ship with moonpool and bilge keels, and can capture the strong nonlinear phenomena","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47386354","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 Explanation for a Paradox in a Fluid-discharging Cantilevered Pipe attached with an End-mass 端部附体悬臂放液管中一个悖论的解释

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-23 DOI: 10.1115/1.4056734

Guixin Zhao, Shuai Meng, Z. Han, Shixiao Fu

{"title":"An Explanation for a Paradox in a Fluid-discharging Cantilevered Pipe attached with an End-mass","authors":"Guixin Zhao, Shuai Meng, Z. Han, Shixiao Fu","doi":"10.1115/1.4056734","DOIUrl":"https://doi.org/10.1115/1.4056734","url":null,"abstract":"\u0000 For a fluid-discharging cantilevered pipe attached with an end-mass, there are two methods to account for the end-mass effect. The first is that the end-mass is considered in the boundary conditions. The second is that the end-mass is included in the equation of motion via a Dirac delta function. As the analytical solution of the linear free vibration model is not available due to the presence of Coriolis force, the eigenfunctions of a beam which satisfy the same boundary conditions are commonly employed in Galerkin method. It has found the first method is incorrect for natural frequency calculation when the internal flow velocity is nonzero. However, the intrinsic mechanism remains to be clarified. This study has demonstrated the eigenfunctions in the first method depends on the end-mass and the orthogonality relations are quite different from that of typical simple beams, based on which a new model is proposed and the prediction compare well with that in the second method. For further validation, the critical internal flow velocity and the onset flutter frequency of a suspended pipe under gravity is computed, which compare well with experimental observations. This study can provide as a workbench for fluid-conveying pipes with various boundary conditions.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46526141","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

Three-dimensional Fracture Analysis of Large Opening Box Girder with Crack Damage under Bending and Torsion Loads 弯曲和扭转荷载作用下具有裂纹损伤的大开口箱梁三维断裂分析

IF 1.6 4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-23 DOI: 10.1115/1.4056736

Ziya Peng, P. Yang, Yuelin Song, K. Hu

{"title":"Three-dimensional Fracture Analysis of Large Opening Box Girder with Crack Damage under Bending and Torsion Loads","authors":"Ziya Peng, P. Yang, Yuelin Song, K. Hu","doi":"10.1115/1.4056736","DOIUrl":"https://doi.org/10.1115/1.4056736","url":null,"abstract":"\u0000 This work aims to investigate the complex fracture behavior of large opening box girder (LOBG) adopting three-dimensional (3D) finite element method (FEM). A numerical model is developed to simulate the fracture of LOBG under individually or jointly applied torsion and bending loads. The crack damage is introduced into both the side plate and bottom plate of LOBG. The influencing factors including crack lengths, crack angles, crack locations are also emphatically discussed. Besides, the crack growth angles are also predicted during the analysis. The results present that the large opening can generate significant effects on the crack propagation of the side plate crack (SPC) and bottom plate crack (BPC). Under the condition of torsion or hogging, SPC grows more easily than BPC, while BPC is relatively prone to grow under sagging condition. It is also found that the initial crack angles can obviously lower the stress intensity factor (SIF) under bending condition compared to torsion condition. Additionally, the cracks gradually approaching transverse frame are also more likely to induce mode I fracture under torsion condition. These findings from the present study can reveal insights for better understanding of fracture behavior for LOBG.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42812974","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

A Study of Offshore Wind Turbine Wake Effects in Yaw Conditions Using an Improved Actuator Line Method 基于改进致动器线方法的海上风力机偏航尾迹效应研究

4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-19 DOI: 10.1115/1.4056519

Ning Fan, Kangping Liao, Qian Wang, Zheng Fang, Hui Zhou

{"title":"A Study of Offshore Wind Turbine Wake Effects in Yaw Conditions Using an Improved Actuator Line Method","authors":"Ning Fan, Kangping Liao, Qian Wang, Zheng Fang, Hui Zhou","doi":"10.1115/1.4056519","DOIUrl":"https://doi.org/10.1115/1.4056519","url":null,"abstract":"Abstract The study of wind turbine wakes is very important for the layout of offshore wind farms. The technique of regulating the yaw angles of the upstream wind turbine to lessen the influence on the downstream turbines has attracted continual attention in recent years. In this study, the wake interactions between a yaw wind turbine and a downstream wind turbine are investigated using a numerical technique based on the openfoam solver in conjunction with an improved actuator line method. The Gaussian anisotropic body force projection method and the integral velocity sampling method are the two fundamental components of the improvement of the actuator line method. The NREL 5-MW wind turbine benchmark model is used to test the numerical accuracy. The simulation of the wake effects from the upstream turbine in non-yawed conditions that follows has good agreement with the results that have been published in the literature. Finally, this work presents a number of predictions about the power coefficients and wake characteristics of two tandem-arranged wind turbines at various yaw angles based on these precise verification efforts. The results of the analysis in yaw conditions are used to derive the yaw wake characteristics and the optimal yaw angle range. As the yaw angle increases, the total power of the wind turbine increases and then decreases, and the upstream wake area decreases significantly. The total power reaches its maximum at 20–30 deg. The research content of this paper will provide an important reference for wind farm scheduling.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135251564","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

Power Performance and Response Analysis of a Semi-Submersible Wind Turbine Combined With Flap-Type and Torus Wave Energy Converters 襟翼型和环面波能变换器组合的半潜式风力机功率性能及响应分析

4区工程技术

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-19 DOI: 10.1115/1.4056520

Chern Fong Lee, Christodoulos Tryfonidis, Muk Chen Ong

{"title":"Power Performance and Response Analysis of a Semi-Submersible Wind Turbine Combined With Flap-Type and Torus Wave Energy Converters","authors":"Chern Fong Lee, Christodoulos Tryfonidis, Muk Chen Ong","doi":"10.1115/1.4056520","DOIUrl":"https://doi.org/10.1115/1.4056520","url":null,"abstract":"Abstract An integrated offshore wind and wave energy system is an attractive concept in areas with abundant wind and wave energy resources. The sharing of supporting platform and facilities, e.g., mooring systems, offers significant cost savings. This will effectively lower the levelized cost of energy (LCOE). In the present study, a conceptual design consisting of a braceless semi-submersible floating horizontal axis wind turbine (FHAWT), three flap-type wave energy converters (WECs), as well as a torus (donut-shaped) point absorber-type WEC is proposed. The flap-type WECs harvest wave energy through the flap motion caused by oscillating wave surge, while the torus WEC absorbs wave energy generated from its heaving motion. The absorbed mechanical power of the power take-off (PTO) systems is calculated based on linear damping forces and the motions of the WECs relative to the supporting platform. Hydrodynamic interaction between the WECs and the supporting platform is considered by including the coupling terms in the added mass and potential damping coefficient matrices. A fully coupled aero-servo-hydro-elastic numerical model of the concept is constructed. The feasibility study of the concept is carried out using time-domain simulations. Only operational environmental conditions are simulated based on simultaneous wind and wave hindcast data of a selected offshore site. The effects of the WECs on the wind turbine, platform motions, and WEC power take-off are examined. Based on the power performance of WECs, recommendations are also provided for optimum power absorption.","PeriodicalId":50106,"journal":{"name":"Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135251563","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