Marine Structures最新文献

A validated fluid–structure interaction simulation model for vortex-induced vibration of a flexible pipe in steady flow 稳定流动中挠性管道涡激振动的流固耦合仿真模型

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-15 DOI: 10.1016/j.marstruc.2025.103895

Xuepeng Fu, Shixiao Fu, Zhibo Niu, Bing Zhao, Jiawei Shen, Pengqian Deng

{"title":"A validated fluid–structure interaction simulation model for vortex-induced vibration of a flexible pipe in steady flow","authors":"Xuepeng Fu, Shixiao Fu, Zhibo Niu, Bing Zhao, Jiawei Shen, Pengqian Deng","doi":"10.1016/j.marstruc.2025.103895","DOIUrl":"10.1016/j.marstruc.2025.103895","url":null,"abstract":"<div><div>We propose a validated fluid–structure interaction simulation framework based on the strip method for the vortex-induced vibration of a flexible pipe. The numerical results are compared with the experimental data from three steady flow conditions: uniform, linearly sheared, and bidirectionally sheared flow. The Reynolds number ranges from <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> to <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>5</mn></mrow></msup></mrow></math></span>. The flow field is simulated based on open-source software OpenFOAM. The solid field is modeled based on the finite element method of the Euler–Bernoulli beam, and fluid–structure coupling is implemented via a weak coupling algorithm developed in MATLAB. The vortex-induced vibration response is assessed in terms of amplitude and frequency, along with the differences in strain. Additionally, wavelet analysis and traveling wave phenomena are investigated. This study presents the first numerical simulation of flexible pipe VIV under bidirectionally sheared flow, validated against experimental data. Compared to uniform and linearly sheared flow, the bidirectionally sheared flow condition leads to more pronounced traveling wave behavior and stronger multi-frequency responses, especially in the in-line direction. The simulation results are directly compared with measured strain data, showing agreement across different flow conditions. The numerical simulation codes and experimental data in this manuscript are openly available, providing a foundation for more complex vortex-induced vibration simulations in the future.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103895"},"PeriodicalIF":4.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

New analysis in the preliminary design for LNG and LPG ships LNG和LPG船舶初步设计中的新分析

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-14 DOI: 10.1016/j.marstruc.2025.103863

Mariano Marcos-Pérez , Javier Jiménez de la Jara , Daniel Precioso , Aurelio Muñoz , M. Victoria Redondo-Neble , David Gómez-Ullate

引用次数: 0

Theoretical investigation on ultimate bearing capacity of offshore floating hoses under internal pressure 内压作用下海上浮式软管极限承载力的理论研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-14 DOI: 10.1016/j.marstruc.2025.103898

Daifeng Wei , Chen An , Songlin Gao , Jixiang Zhang , Youan Li , Segen F. Estefen

{"title":"Theoretical investigation on ultimate bearing capacity of offshore floating hoses under internal pressure","authors":"Daifeng Wei , Chen An , Songlin Gao , Jixiang Zhang , Youan Li , Segen F. Estefen","doi":"10.1016/j.marstruc.2025.103898","DOIUrl":"10.1016/j.marstruc.2025.103898","url":null,"abstract":"<div><div>Floating hoses are critical components in offshore oil and gas transportation systems, engineered to withstand various loads such as internal pressure, tension, torsion, and bending. In this study, an anisotropic constitutive model for cord-rubber and helix wire-rubber composite materials was proposed based on the Mooney–Rivlin hyperelastic formulation, taking into account the nonlinear mechanical behavior of rubber. Linear systems of equations describing the displacement and stress fields within the composite layers were established, incorporating unknown integration constants. The accuracy of the proposed theoretical model was validated through full-scale burst tests. Furthermore, the mechanical behavior of the hose under a design pressure of 10 MPa—five times the rated working pressure—was analyzed. Parametric studies were conducted to examine the effects of key structural parameters, including the cord winding angle, number of cord layers, helix wire diameter, pitch, and hose inner diameter, on the ultimate internal pressure and axial stiffness. The findings provide valuable technical guidance for the structural optimization and performance improvement of offshore floating rubber hoses.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103898"},"PeriodicalIF":4.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Structural optimization of non-rotating floating cranes: Analysis of classical designs and development of a dual-pontoon configuration 非旋转浮式起重机结构优化：经典设计分析及双浮桥结构的发展

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-11 DOI: 10.1016/j.marstruc.2025.103897

Sergey G. Gnezdilov , Alexander N. Shubin

引用次数: 0

Fatigue damage prediction model for broadband non-Gaussian random processes based on Bayesian optimized random forest 基于贝叶斯优化随机森林的宽带非高斯随机过程疲劳损伤预测模型

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-10 DOI: 10.1016/j.marstruc.2025.103894

Kuilin Yuan , Boyu Huang , Hanchu Qin

{"title":"Fatigue damage prediction model for broadband non-Gaussian random processes based on Bayesian optimized random forest","authors":"Kuilin Yuan , Boyu Huang , Hanchu Qin","doi":"10.1016/j.marstruc.2025.103894","DOIUrl":"10.1016/j.marstruc.2025.103894","url":null,"abstract":"<div><div>Marine structures operating in harsh ocean environments are continuously exposed to cyclic loads that may induce fatigue damage. Accurate fatigue damage prediction is therefore essential for ensuring the structural integrity of marine structures. When the structural responses exhibit broadband non-Gaussian characteristics, the existing frequency-domain methods appears to have insufficient accuracy. Although the time-domain rainflow counting method can achieve higher accuracy, it incurs high computational costs. To address these challenges, this study develops a fatigue damage prediction model for broadband non-Gaussian random processes by combining the random forest (RF) algorithm with Bayesian optimization (BO) approach. The BO-RF model is trained by employing the database including the fatigue damage related to diverse power spectra with a broad range of bandwidth parameters and a variety of S-N curve slope, skewness and kurtosis. Extensive numerical simulations demonstrate that the developed BO-RF model is superior to the tradition frequency-domain methods in terms of accuracy and robustness. Furthermore, comparative analysis against an artificial neural network (ANN) model further reveals the advantages of BO-RF model in both training efficiency and generalization capability. This study demonstrates the proposed BO-RF model can provide a feasible solution for accurate and efficient fatigue damage prediction of marine structures under broadband non-Gaussian random loading.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103894"},"PeriodicalIF":4.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Numerical study of soft-connected modular offshore floating photovoltaic array 软连接模块化海上浮动光伏阵列的数值研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-08 DOI: 10.1016/j.marstruc.2025.103893

Jenish Baniya , Jian Dai , Zhiyu Jiang , Chi Zhang

{"title":"Numerical study of soft-connected modular offshore floating photovoltaic array","authors":"Jenish Baniya , Jian Dai , Zhiyu Jiang , Chi Zhang","doi":"10.1016/j.marstruc.2025.103893","DOIUrl":"10.1016/j.marstruc.2025.103893","url":null,"abstract":"<div><div>Offshore floating photovoltaics (FPV) has emerged as a viable technology due to abundant space and efficiency. However, deploying FPV in offshore environments is challenging due to harsh environmental conditions. This paper studies a recently developed FPV concept with a lightweight, semi-submersible float with soft connections for offshore conditions to address the technical and economic challenges. The study aims to obtain insight into the dynamic behaviour of the proposed FPV design with a numerical model. The hydrodynamic model is based on the potential solver WADAM. The rigid body motions of floats with the dynamics of flexible structural elements subjected to wave excitations are studied in time-domain software SIMO-RIFLEX. The time domain numerical model is calibrated and validated by using available experimental results. The results from the numerical simulation are found to match the experimental results on the float motions and mooring tensions satisfactorily under regular and irregular wave conditions. A parametric study is carried out to examine the effect of mooring line pretension and stiffness on the motion response of the FPV floats. The findings from the numerical study provide valuable insight for further design optimisation and development of similar systems.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103893"},"PeriodicalIF":4.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Unexpected ice-induced vibrations of a conical structure in model scale 模型尺度下锥形结构的意外冰激振动

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-08 DOI: 10.1016/j.marstruc.2025.103880

Alice Petry , Otto Puolakka , Tim C. Hammer , Hayo Hendrikse , Arttu Polojärvi

{"title":"Unexpected ice-induced vibrations of a conical structure in model scale","authors":"Alice Petry , Otto Puolakka , Tim C. Hammer , Hayo Hendrikse , Arttu Polojärvi","doi":"10.1016/j.marstruc.2025.103880","DOIUrl":"10.1016/j.marstruc.2025.103880","url":null,"abstract":"<div><div>Offshore wind turbines in cold sea areas can be fitted with ice cones to reduce static and dynamic loads from drifting sea ice. The effectiveness of ice cones in reducing static loads has been tested in model-scale ice basin experiments. However, only a few experiments used compliant test setups to study ice-induced vibrations on conical structures. This study explores the dynamic interaction between level ice and a downward-bending cone with a 60° slope angle through ice basin tests with a hardware-in-the-loop system based on a hybrid technique, combining a physical indenter with a numerical structure model of an offshore wind turbine. Two types of periodic ice-induced vibrations were observed for the first time in an ice basin: bending failure-induced vibrations and unexpected vibrations caused by local failure at the ice-structure interface. The local failure had characteristics of both shear failure and crushing failure and occurred at low ice-structure interaction speeds during tests. Local failure-induced vibrations were significant in the dynamic test with an ice-drift speed of 5mms<sup>-1</sup>, however they also contributed to the dynamic response of the structure at higher ice-drift speeds. Bending failure-induced vibrations occurred at critical ice-drift speeds (30mms<sup>-1</sup> to 40mms<sup>-1</sup> and 70mms<sup>-1</sup> to 100mms<sup>-1</sup>) where the bending failure frequency matched the 1st or 2nd natural frequency of the structure model. The results show that ice-induced vibrations on conical structures occur at various ice-drift velocities for both previously known and unexpected ice failure modes. Furthermore, the results provide new insight into conducting ice basin tests on ice-structure interaction with compliant conical structures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103880"},"PeriodicalIF":4.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Study on plasma arc penetration process of abandoned offshore wells 海上废弃井等离子弧穿透过程研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-03 DOI: 10.1016/j.marstruc.2025.103889

Peng Liu , Yonghong Liu , Qingxiang Wang , Xinlei Wu , Chi Ma

{"title":"Study on plasma arc penetration process of abandoned offshore wells","authors":"Peng Liu , Yonghong Liu , Qingxiang Wang , Xinlei Wu , Chi Ma","doi":"10.1016/j.marstruc.2025.103889","DOIUrl":"10.1016/j.marstruc.2025.103889","url":null,"abstract":"<div><div>Recently, massive numbers of offshore production platforms have faced decommissioning. Abandoned offshore wells demolition is a significant part of offshore platform decommissioning. This work explored the plasma arc penetration process of abandoned offshore wells. Three types of workpieces were made for underwater penetration experiments. Workpiece 1 was a single-layer steel plate, workpiece 2 was a double-layer steel plate with a gap, and workpiece 3 was a double-layer steel plate with a cement layer. It was found that slag bridging occurred during the penetration of workpiece 2. Slag bridging was closely related to the gap size. There was no slag bridging during the penetration of workpiece 3, but its penetration difficulty was the greatest among the three working conditions. It was also found that the penetration effect of the second steel plate was strongly influenced by the branching arc acting on the second steel plate. The wider the gap and the cement layer, the lower the branching arc current on the second steel plate and the worse the penetration effect. In summary, the plasma arc can penetrate all three types of workpieces under certain operating conditions. This technology is expected to play a significant role in abandoned offshore wells demolition.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103889"},"PeriodicalIF":4.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 qualitative study on the lateral behavior of rock-socketed monopiles 嵌岩单桩横向特性的定性研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-03 DOI: 10.1016/j.marstruc.2025.103892

Shamsher Sadiq , Hyeon-Jung Kim , Myoung-Soo Won , Young-Chul Park

{"title":"A qualitative study on the lateral behavior of rock-socketed monopiles","authors":"Shamsher Sadiq , Hyeon-Jung Kim , Myoung-Soo Won , Young-Chul Park","doi":"10.1016/j.marstruc.2025.103892","DOIUrl":"10.1016/j.marstruc.2025.103892","url":null,"abstract":"<div><div>Monopile supporting offshore wind turbines (OWT) in regions with shallow rock can benefit from rock-socketing. This study qualitatively investigates the effect of the rock layer on the serviceability limit state (SLS) and the ultimate limit state (ULS) of the monopiles. A nonlinear three-dimensional finite element model was constructed to simulate monopile–soil interaction and was validated using data from centrifuge experiments. The effect of the rock-socketing was analyzed for three cases flexible, semi-rigid and rigid, and compared with conditions in pure sand. The results are presented in terms of the limit state selection, lateral capacities, lateral deformation modes, soil deformation patterns, lateral earth pressure distribution and soil reaction curves (p-y). The finding indicates that rock-socketing significantly affects the lateral responses for semi-rigid and rigid monopiles, while its impact on the flexible monopiles is minimal. Furthermore, the study highlights the need to develop a generalized lateral earth pressure distribution for the simplified lateral response prediction of rock-socketed monopiles.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103892"},"PeriodicalIF":4.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Eliciting dynamic features of a large interconnected box-pontoon-type offshore floating photovoltaic array 大型互联箱型浮桥式海上浮动光伏阵列的动力学特性研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-03 DOI: 10.1016/j.marstruc.2025.103887

Yongqiang Chen , Xiantao Zhang , Xiaodong Wu

{"title":"Eliciting dynamic features of a large interconnected box-pontoon-type offshore floating photovoltaic array","authors":"Yongqiang Chen , Xiantao Zhang , Xiaodong Wu","doi":"10.1016/j.marstruc.2025.103887","DOIUrl":"10.1016/j.marstruc.2025.103887","url":null,"abstract":"<div><div>This paper investigates a 5MW box-pontoon-type interconnected Offshore Floating Photovoltaic (OFPV) square platform with a side length of 160 m. Two primary problems in designing the box-pontoon-type OFPV platform are addressed, that is, the optimal modular unit size (hinge configurations) within specific wavelength range, and under what conditions can the structure be treated rigid to mitigate computational cost. To deal with the first issue, the displacement type is proposed after investigations into hydroelasticity of fifteen hinge configurations. The selected hinge configurations should put the structure in proper displacement type with relatively small vertical displacement and mild hinge shear force. To deal with the latter issue, dynamic responses of rigid modular units are calculated and compared, which indicate the box-pontoon-type OFPV cannot be simplified as rigid bodies unless it has an unrealistic large elastic modulus. The genralized rigid state is then proposed to illustrate a critical elastic modulus value, which shows that hydroelasticity will stablize instead of increasing once the structure’s elastic modulus exceeds this value.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103887"},"PeriodicalIF":4.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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