Marine Structures最新文献

{"title":"An efficient approach for time-domain fatigue analysis for semi-submersible hulls of floating wind turbines","authors":"Shuaishuai Wang ,&nbsp;Torgeir Moan ,&nbsp;Zhen Gao ,&nbsp;Shan Gao","doi":"10.1016/j.marstruc.2025.103955","DOIUrl":"10.1016/j.marstruc.2025.103955","url":null,"abstract":"<div><div>This study evaluates an efficient time-domain fatigue analysis approach for welded joints in semi-submersible floating wind turbine (FWT) hulls. A fully coupled, time domain approach serves as reference for comparing simplified methods. In particular, a simplified decoupled method in which the global load effects due to wind and waves are determined separately and the corresponding hot spot stress for estimating the fatigue damage in representative points is determined by superimposing the time series of the stress due to global wave and wind effects. A 10-MW semi-submersible FWT at various North Sea and China offshore locations, is analyzed employing a multi-segment floater model to capture global structural responses. Fatigue damage of various positions of the hull is estimated using the rainflow cycle counting method and the SN-curve approach. The results indicate that the fully coupled method, while highly accurate in capturing real-time wind-wave interactions, implies significant computational costs. The decoupled approach enhances the efficiency and reduces the simulation requirements by over 80 %, while maintaining a reasonable accuracy, particularly for wind turbines in the Northern North Sea, i.e., with a deviation of &lt;12 %. In addition, a highly simplified method is proposed, which is based on considering only the most probable wave conditions at different wind speeds. This method shows good agreement with fully coupled fatigue assessments in the Northern North Sea, but it leads to notable underestimation in the South China Sea. However, further investigations of this approach are needed to document its feasibility. The findings in this study highlight the trade-offs between computational cost and accuracy, and especially shows the potential of the decoupled method for an efficient long-term fatigue assessment of floating wind turbines. Future research should be carried out to document its applicability for various floating wind turbine designs and offshore locations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103955"},"PeriodicalIF":5.1,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362649","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}

{"title":"Deterministic real-time prediction of ship roll motion with quantified uncertainty based on machine learning","authors":"Limin Huang ,&nbsp;Hangyu Chen ,&nbsp;Yejia Feng ,&nbsp;Gaoxiang Sun ,&nbsp;Hao Jiang ,&nbsp;Xuewen Ma","doi":"10.1016/j.marstruc.2025.103946","DOIUrl":"10.1016/j.marstruc.2025.103946","url":null,"abstract":"<div><div>Real-time prediction of the ship motion in advance can effectively enhance the safety and efficiency of maritime operations. However, the current prediction methods mainly focus on the motion time series forecasting without considering the uncertainty existing in measured motions. In this paper, a novel prediction method combined with the confidence interval forecasting of the motion is proposed. The method integrates the probability prediction module into the time-series prediction model. The normal distribution and student’s T-distribution are considered and the long short-term memory (LSTM) neural network is selected as the time-series prediction model. A set of measured full-scale ship roll motion of Yukun Ship is used to verify the prediction performance. The results demonstrate that the proposed method can effectively predict the confidence intervals of future ship motions, especially for extreme motions. This approach circumvents the issue of reduced accuracy over longer prediction periods, which is commonly existed in traditional time-series prediction models due to the influence of non-stationary characteristics of the data. Particularly, at the confidence level of 99 %, the prediction results could cover &gt;90 % of the motion time series for future 12 s, which can significantly ensure the safety of offshore operations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103946"},"PeriodicalIF":5.1,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220685","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}

{"title":"Influences of interface bonding behavior on the arresting performance of CFRP buckle arrestors - Part II: Analysis","authors":"Xipeng Wang ,&nbsp;Zhi Ding ,&nbsp;Lin Yuan ,&nbsp;Yingying Wang ,&nbsp;Shunfeng Gong","doi":"10.1016/j.marstruc.2025.103922","DOIUrl":"10.1016/j.marstruc.2025.103922","url":null,"abstract":"<div><div>The CFRP buckle arrestor, designed as an innovative arresting device, effectively enhances the local circumferential stiffness of subsea pipes, serving as a barrier to prevent the spread of buckling. This arrestor consists of multiple layers of adhesive and CFRP, carefully wound around the subsea pipes in several loops. In the present work, a fully-coupled nonlinear finite element (FE) model is proposed to simulate the collapse and its evolution of tubes wrapped with CFRP arrestors, which is verified by the previous experimental results. The interface bonding performance between tubes and CFRP arrestors is characterized by the surface-based cohesive behavior in ABAQUS, and the circumferential, axial, and normal bonding behavior is defined according to the measured bonding strength and slip. The failure mechanism at the interface between the tubes and CFRP arrestors is revealed. Subsequently, broad parametric analyses are numerically performed, covering key geometric and material parameters as well as interface bonding properties. Finally, based on the extensive FE results, optimized empirical formulas are established to assess the crossover pressure and arresting efficiency of CFRP buckle arrestors under flattening-mode.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103922"},"PeriodicalIF":5.1,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144810003","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}

{"title":"Simplified ultimate strength estimation method of continuous stiffened panels under biaxial loads and lateral pressure","authors":"Kinya Ishibashi ,&nbsp;Daisuke Shiomitsu ,&nbsp;Minoru Harada ,&nbsp;Masahiko Fujikubo","doi":"10.1016/j.marstruc.2025.103903","DOIUrl":"10.1016/j.marstruc.2025.103903","url":null,"abstract":"<div><div>A simplified method is proposed for estimating the ultimate strength of continuous stiffened panels subjected to combined longitudinal and transverse loads, as well as lateral pressure. For the more rational design of ship hull structures, it is essential to develop an estimation method with a solid physical basis. Previous methods have been developed theoretically, explicitly considering factors such as post-buckling and yielding behaviors in addition to initial deflection. However, these approaches often require numerical iterations, such as the Newton-Raphson method, to obtain the load-deflection relationships. In this study, analytical solutions are derived for the elastic post-buckling behaviors of stiffened panels, eliminating the need for numerical iterations; this enables the development of a simple yet practical method for estimating the ultimate strength. By observing and classifying the collapse behavior of stiffened panels through nonlinear finite element analysis (NLFEA), the ultimate strength can be predicted by assessing yielding at predefined locations corresponding to the identified collapse modes. The accuracy of the proposed method is validated through comparisons with NLFEA results.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103903"},"PeriodicalIF":5.1,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721908","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}

{"title":"Fatigue damage summation with bias correction","authors":"Nils Sødahl ,&nbsp;Sindre O. Skrede ,&nbsp;Guttorm Grytøyr ,&nbsp;Kathrine Gregersen","doi":"10.1016/j.marstruc.2025.103926","DOIUrl":"10.1016/j.marstruc.2025.103926","url":null,"abstract":"<div><div>This paper presents a framework for establishing bias factors for combining fatigue damage from two independent stochastic processes considering linear SN-curves. The proposed design approach for calculating fatigue damage consists of identifying appropriate bias factor from bias factor contours pre-generated by simulations, and correcting the linear sum fatigue estimate to account for stress amplification. Depending on input parameters, the approach can account for Gaussian, non-Gaussian, wide-banded and narrow-banded processes in a practical way, which is not achieved by existing methods. For long-term fatigue assessments, simplified approaches are possible by selecting a conservative representative bias factor at global minimum, while more accurate estimates can be found by more careful selection of bias factor per short-term condition. Case-specific design contours tailored to the application can be generated using the methodology described. In this paper examples of design contours for combination of wave induced- and vortex induced vibrations (VIV) fatigue relevant for marine risers are presented.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103926"},"PeriodicalIF":5.1,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921309","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}

{"title":"Second order buckling load of underwater composite cylinder","authors":"Yao Zhu","doi":"10.1016/j.marstruc.2025.103904","DOIUrl":"10.1016/j.marstruc.2025.103904","url":null,"abstract":"<div><div>In this paper, a novel nonlinear second-order buckling load computational method is proposed for underwater composite submersibles using variational principle while solving the effects of nonorthogonal anisotropic constitutive relationship and all linear and nonlinear terms in the discrete Lagrangian strain. For 20 medium-length experimental specimens in the range of 14.11∼68.70 radius-to-thickness ratios, the maximum prediction error of this method is -15.235 %, the minimum prediction error is 0.90 %, and the average prediction error is 6.17 %; the absolute prediction errors are within 10 % for 16 specimens, and within 15 % for 19 specimens. For the 22 experimental specimens in the range of 8.33 ∼ 68.70 radius-to-thickness ratios with length-to-radius ratio increasing up to 24, the maximum prediction error of the method is -18.85 %, the minimum prediction error is 0.90 %, and the average prediction error is 6.98 %; the absolute prediction error is within 10 % for 16 of the specimens, and within 15 % for 20 of the specimens. In addition, this method has good convergence, stability, and angle order immunity. The method improves the prediction accuracy and reduces the prediction error fluctuation range compared with analytical methods and commercial FEM software. The method solves the difficulty that commercial FEM software is unable to predict the buckling loads under classical simply supported boundary condition. Among the total 22 specimens, the prediction results about 19 of them shows conservative results, with the maximum degree of conservatism of -18.85 %, which is within the engineering acceptance range. This is conducive to providing a more adequate safety margin of buckling load for the design of underwater composite submersibles in offshore engineering.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103904"},"PeriodicalIF":4.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144702601","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}

{"title":"Optimizing mooring tethers to minimize wave-induced structural responses in submerged floating tunnels","authors":"Kiwon Jeong ,&nbsp;Chungkuk Jin ,&nbsp;Yunhak Noh ,&nbsp;Joonseob Kim ,&nbsp;Jongyoon Moon ,&nbsp;Seungjun Kim","doi":"10.1016/j.marstruc.2025.103923","DOIUrl":"10.1016/j.marstruc.2025.103923","url":null,"abstract":"<div><div>This study investigates optimal mooring tether designs for submerged floating tunnels (SFTs) to mitigate dynamic structural responses under wave loading. Four configurations were assessed through hydrodynamics-based numerical simulations in ABAQUS-AQUA, enabling direct comparison of motion control performance. The doubly-inclined tether system exhibited the highest efficiency, and its motion control mechanism was experimentally validated. Based on these findings, an integrated mooring design process incorporating multiple criteria is proposed. Recognizing the difficulty of determining optimal design parameters solely through numerical simulations, a simplified analytical method is introduced as an efficient alternative and validated against simulation results. By applying this method, an optimal doubly-inclined tether configuration was obtained, with an outside tether inclination angle of 27.7°, determined considering maximum and minimum tether stresses, and a spacing of 58 m between tethers, governed by fatigue. As these parameters vary with environmental conditions, their final determination should follow the proposed design process for practical implementation.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103923"},"PeriodicalIF":5.1,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886734","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}

{"title":"Torsional and tension–bending analysis of a three-core submarine power cable","authors":"Pan Fang ,&nbsp;Xiao Li ,&nbsp;Xiaoli Jiang ,&nbsp;Hans Hopman ,&nbsp;Yong Bai","doi":"10.1016/j.marstruc.2025.103896","DOIUrl":"10.1016/j.marstruc.2025.103896","url":null,"abstract":"<div><div>Submarine power cables (SPCs) are subjected to complex mechanical loadings during service, including tension, bending, torsion, and their combinations. However, systematic studies on the behavior of SPCs – particularly multi-core configurations – under such combined environmental loadings remain limited. This lack of comprehensive analysis hampers a full understanding of their mechanical responses and consequently restricts the design and development of these critical structures. Building upon our previously validated Representative Unit Cell (RUC) model for local mechanical analysis under pure tension and pure bending, this paper extends the investigation to a three-core SPC under a range of combined load cases. In addition, full-scale models are developed to study the torsional response in greater detail. The findings of this study provide valuable guidance for cable engineers, offering new insights into the internal interactions within SPCs and supporting more robust cable design.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103896"},"PeriodicalIF":4.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711980","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}

{"title":"Statistical analysis of ice load occurrence in floe ice fields","authors":"Chenxi Xie ,&nbsp;Lijuan Xia ,&nbsp;Longhui Xiao ,&nbsp;Pentti Kujala ,&nbsp;Fang Li","doi":"10.1016/j.marstruc.2025.103921","DOIUrl":"10.1016/j.marstruc.2025.103921","url":null,"abstract":"<div><div>Ships navigating in the Arctic and Antarctic regions frequently encounter the threat of ice. Floe ice exhibits various shapes and sizes, with significant variations in thickness and concentration across different ice fields. Estimating the number of ice loads accurately is crucial for strategic navigation and fatigue damage assessment. This paper focuses on the ice load occurrence in floe ice fields which can be determined by the time intervals between contacts. Previous study has shown that the occurrence in level ice fields follows a Poisson distribution and the time intervals follow an exponential distribution. Based on the measurement data on Polar oly and Research Vessel (PSRV) S.A. Agulhas II during 2018/19 Antarctic voyage which encountered extensive floe ice, this paper examines the applicability of previously proposed patterns in level ice fields to floe ice fields. A mixture of exponential distributions is proposed to fit the time intervals in floe ice fields and the statistical test is adopted to evaluate the goodness of fit. The relationships between the parameters of ice conditions and distribution models are discussed. Monte Carlo method and theoretical method are adopted to obtain the ice load occurrence based on the distribution of time intervals. To assess the uncertainty associated with the estimated parameters and the ice load occurrence, Bayesian approach and Bootstrapping are adopted. To further investigate the influence of ice load occurrence on short-term extreme distributions of local ice loads, three methods are employed and the distributions are found to be highly consistent.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103921"},"PeriodicalIF":5.1,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144864358","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}

{"title":"Numerical analysis of extreme water slamming damage and residual strength of ring-stiffened columns of a semi-submersible floating offshore wind turbine","authors":"Stina Bjørgo Fimreite ,&nbsp;Zhaolong Yu ,&nbsp;Jørgen Amdahl ,&nbsp;Marilena Greco","doi":"10.1016/j.marstruc.2025.103900","DOIUrl":"10.1016/j.marstruc.2025.103900","url":null,"abstract":"<div><div>Foundation platforms of floating offshore wind turbines (FOWTs) must withstand harsh weather conditions, during which wave slamming is an important loading condition. Slamming is a complex dynamic problem involving fluid–structure interactions (FSI) but is often simplified as simple pressure loads neglecting the coupling effects during design. This paper examines the local structural response of a column of a FOWT floater during slamming, offering deeper understanding of impact dynamics and a measure of accuracy for design methods.</div><div>An initial benchmark study on numerical techniques of modeling FSI during water impact of a thin plate was conducted adopting three approaches, i.e. arbitrary Lagrangian–Eulerian (ALE), smoothed particle hydrodynamics (SPH) and incompressible computational fluid dynamics (ICFD). Subsequently, water impact on a ring stiffened cylindrical column of a FOWT floater was investigated using ALE simulations in a range of idealized impact conditions. The structural responses and impact pressures were analyzed, focusing on structural damage evolution. Simplified design methods for predictions of slamming damage were compared with the coupled FSI simulations, using four methods for generating design pressures. Finally, the residual bending strength of the damaged column was determined as an assessment of the consequences of slamming regarding structural integrity.</div><div>This paper provides insights into accuracy levels of different numerical techniques for FSI modeling and contributes to efficient design of offshore structures subjected to severe wave slamming.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"105 ","pages":"Article 103900"},"PeriodicalIF":4.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713366","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}