Marine Structures最新文献_第2页

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

Simulated ice loads on a ship propeller and comparison with full-scale measurements 模拟船舶螺旋桨上的冰载荷及其与实际测量值的比较

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-03 DOI: 10.1016/j.marstruc.2025.103879

Jorrid Lund, Lina Sapp, Jan Manuel Kubiczek, Angelo Mario Böhm, Franz von Bock und Polach

{"title":"Simulated ice loads on a ship propeller and comparison with full-scale measurements","authors":"Jorrid Lund, Lina Sapp, Jan Manuel Kubiczek, Angelo Mario Böhm, Franz von Bock und Polach","doi":"10.1016/j.marstruc.2025.103879","DOIUrl":"10.1016/j.marstruc.2025.103879","url":null,"abstract":"<div><div>A methodology to better estimate the loads of ice acting on the propeller of a ship is developed. Based on measurements conducted in the North Pole region, an existing failure model for ice based on the Mohr–Coulomb nodal split approach is modified to better represent the lower strength of polar ice compared to laboratory ice. The modified material model for the sea ice is used to compute the propeller torque and a load spectrum for the propeller-ice interaction of the research ship <em>S.A. Agulhas II</em>. To this end, a floe-ice breaking simulation is used to estimate the size and shape of the ice cusps hitting the propeller of this ship. In the next step, a set of finite element simulations of the propeller-ice interaction utilizing the modified Mohr–Coulomb nodal split model is conducted. Based on this, the load spectrum is computed and compared with the measured torque on the propeller shaft of the <em>S.A. Agulhas II</em>. The successful reproduction shows the applicability of the approach to better estimate the loads exerted by the ice on the propeller.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103879"},"PeriodicalIF":4.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549587","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

On the use of an advanced Kirchhoff rod model to study mooring lines 利用先进的基尔霍夫杆模型研究系泊线

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-01 DOI: 10.1016/j.marstruc.2025.103883

Bruno A. Roccia , Thi-Hoa Nguyen , Petter Veseth , Finn Gunnar Nielsen , Cristian G. Gebhardt

{"title":"On the use of an advanced Kirchhoff rod model to study mooring lines","authors":"Bruno A. Roccia , Thi-Hoa Nguyen , Petter Veseth , Finn Gunnar Nielsen , Cristian G. Gebhardt","doi":"10.1016/j.marstruc.2025.103883","DOIUrl":"10.1016/j.marstruc.2025.103883","url":null,"abstract":"<div><div>In this work, we investigate the application of an advanced nonlinear torsion- and shear-free Kirchhoff rod model, enhanced with a penalty-based barrier function (to simulate the seabed contact), intended for studying the static and dynamic behavior of mooring lines. The formulation incorporates conservative and non-conservative external loads, including those coming from the surrounding flow (added mass, tangential drag, and normal drag). To illustrate the favorable features of this model, we consider some key scenarios such as static configurations, pulsating force applications at the fairlead, and fluid–structure interaction between mooring lines and the surrounding flow. Verification against well-established solutions, including catenary configurations and OpenFAST simulations, shows excellent accuracy in predicting mooring line responses for a floating offshore wind turbine. Among the most important results, we can mention that under normal pulsating loads at the fairlead, the mooring line exhibits a transition from a drag-dominated regime at low frequencies to an added-mass-dominated regime at higher frequencies. Furthermore, tangential forcing at the fairlead reveals a strong coupling between axial and bending dynamics, contrasting with normal forcing scenarios where axial dynamics remain largely unaffected. These findings underscore the potential of the proposed approach for advanced mooring line simulations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103883"},"PeriodicalIF":4.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523787","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

Penetration installation of the13-compartment mono-column composite bucket foundation for offshore wind turbines 海上风力发电机组13室单柱复合桶形基础侵彻安装

IF 4 2区工程技术

Marine Structures Pub Date : 2025-07-01 DOI: 10.1016/j.marstruc.2025.103891

Puyang Zhang, Yabo Pang, Xin Qi, Conghuan Le, Hongyan Ding

{"title":"Penetration installation of the13-compartment mono-column composite bucket foundation for offshore wind turbines","authors":"Puyang Zhang, Yabo Pang, Xin Qi, Conghuan Le, Hongyan Ding","doi":"10.1016/j.marstruc.2025.103891","DOIUrl":"10.1016/j.marstruc.2025.103891","url":null,"abstract":"<div><div>The 13-compartment mono-column composite bucket foundation, which will be abbreviated as \"The 13-compartment MCCBF\" in the following text, has stronger applicability to the shallow bedrocks and plays an important role in the development of wind farms in the South China Sea with more shallow bedrocks. This paper studies the penetration installation characteristics of 13-compartment MCCBF under four geological conditions: pure sand, clay over sand, sand over shallow bedrock, and clay over shallow bedrock. Through a 1:60 scale model test, the variation law of the pore water pressure around the foundation during its penetration installation was analyzed, the morphological changes of the surrounding soil and the development law of soil plug after the foundation installation were explained, and the required penetration suction of the foundation under different geological conditions was explored. The research results show that during the penetration installation of the foundation, the required pressure difference increases with the increase of the penetration depth, the pressure of the compartment in the overlying clay geology is higher than that in the overlying sand geology, with a difference of about 3–5.5 times. The penetration installation speed of the foundation in the shallow bedrock geology is faster, about 1.6–5 times that of the geology without shallow bedrocks. The volume of seepage water in the sand over shallow bedrock geology is about 50 % of that in the pure sand geology. Soil plug will be formed in the process of foundation penetration, among which the soil plug is the highest in the sand over shallow bedrock geology.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103891"},"PeriodicalIF":4.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523788","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