Marine Structures最新文献_第7页

Asymmetric response analysis of large multi-body floating offshore platform in waves based on an improved CFD-FEA method 基于改进cfd -有限元法的大型多体海上浮式平台波浪响应非对称分析

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-11-13 DOI: 10.1016/j.marstruc.2025.103962

Nan Gu , Xueqian Zhou , Lei Li , Huilong Ren

The large multi-body floating offshore platform is a new type of offshore structure with a rectangular, long and flat shape. Traditional CFD-FEA methods, that use one backbone beam to simulate the stiffness of the whole floating offshore platform, is only applicable to symmetric response problems of floating offshore structure, specifically to vertical bending issues under head sea conditions, thus limiting its scope of application. In quartering seas, waves not only vary along the length of the offshore platform but also in the beam direction. The large multi-body floating offshore platform has a large breadth, resulting in a modest overall torsional stiffness. Under severe quartering sea conditions, the large multi-body floating offshore platform may undergo significant torsional deformation due to the substantial torsional moment induced by waves, presenting an asymmetric response problem. In the present paper, an improved CFD-FEA method based on backbone beam grid model composed of Timoshenko beams that can be used to simulate the vertical bending, horizontal bending, and longitudinal torsional motion of the offshore platform is developed for the analysis of asymmetric responses of large multi-body floating offshore platform. The hydrodynamic and structural response characteristics of the large multi-body floating offshore platform are studied experimental via a segmented model test, and also numerically using an improved CFD-FEA method. Comparisons of numerical results with experimental results show the validity of the proposed numerical simulation approach.

大型多体浮式海洋平台是一种矩形、长条形、扁平状的新型海洋结构体。传统的CFD-FEA方法是用一根主梁来模拟整个海上浮式平台的刚度，这种方法只适用于海上浮式结构的对称响应问题，特别是头海条件下的垂直弯曲问题，因而限制了其适用范围。在起锚海域，波浪不仅沿着海上平台的长度变化，而且沿着波束方向变化。大型多体浮式海上平台具有较大的宽度，整体抗扭刚度适中。在恶劣的海况下，大型多体浮式海上平台由于波浪引起的巨大扭转力矩，可能产生较大的扭转变形，呈现不对称响应问题。本文提出了一种改进的基于Timoshenko梁组成的主梁网格模型的cfd -有限元分析方法，该方法可模拟海洋平台的垂直弯曲、水平弯曲和纵向扭转运动，用于分析大型多体浮式海洋平台的非对称响应。通过分段模型试验和改进的CFD-FEA方法，对大型多体浮式海上平台的水动力和结构响应特性进行了实验研究。数值结果与实验结果的比较表明了所提出的数值模拟方法的有效性。

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引用次数: 0

Deep learning-based damage localization method for strain analysis of jacket offshore platform structures 基于深度学习的海洋平台导管架结构应变分析损伤定位方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-11-20 DOI: 10.1016/j.marstruc.2025.103972

Shufeng Feng, Lei Song, Zhuoyi Yang, Tengfei Sun, Kai Wu, Peng Liu, Qilong Wu, Jiarui Huang

Jacket offshore platforms operate in complex marine environments for extended periods, making them susceptible to damage such as cracks and corrosion, which pose serious threats to structural safety. Therefore, research on their structural health monitoring is of great significance. To investigate the effectiveness of deep learning models in damage identification for jacket offshore platforms, this study designed multiple small-scale experimental conditions involving cracks and corrosion on three-pile and four-pile jacket structures. Strain signal data were collected under various damage scenarios. The damage identification performance of convolutional neural networks (CNN), long short-term memory networks (LSTM), and their hybrid model (CNN-LSTM) was evaluated, and the noise resistance of each algorithm was further assessed. The experimental results demonstrate that the CNN model exhibits high accuracy and stability in identifying both crack and corrosion damages, with additional advantages of computational efficiency, structural simplicity, and robustness against noise interference. These findings provide theoretical foundations and methodological support for the structural health monitoring of jacket offshore platforms and show great potential for engineering applications.

导管架海上平台在复杂的海洋环境中长时间运行，容易受到裂缝和腐蚀等损害，对结构安全构成严重威胁。因此，对其结构健康监测的研究具有重要意义。为了研究深度学习模型在导管架海上平台损伤识别中的有效性，本研究设计了涉及三桩和四桩导管架结构裂缝和腐蚀的多个小尺度实验条件。采集了不同损伤情况下的应变信号数据。评估了卷积神经网络（CNN）、长短期记忆网络（LSTM）及其混合模型（CNN-LSTM）的损伤识别性能，并进一步评估了每种算法的抗噪声性能。实验结果表明，CNN模型在识别裂纹和腐蚀损伤方面具有较高的准确性和稳定性，并且具有计算效率高、结构简单、抗噪声干扰能力强等优点。这些研究结果为海上平台导管架结构健康监测提供了理论基础和方法支持，具有很大的工程应用潜力。

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引用次数: 0

Damage-based strength reduction factor for seismic design of structures subjected to offshore ground motions 基于损伤的强度折减系数在近海地震动结构抗震设计中的应用

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-09-23 DOI: 10.1016/j.marstruc.2025.103945

Bali Liu , Hao Tian , Jinjun Hu , Changhai Zhai

This paper focuses on damage-based strength reduction factor (SRF) of single-degree-of freedom (SDOF) systems subjected to an ensemble of 892 offshore ground-motion records from the Kyoshin network in the Japan Sagami Bay Region. Damage-based SRF spectra are statistically developed considering both the offshore ground-motion characteristics (such as seafloor stations, magnitude, epicentral distance, significant duration and mean period) and structural parameters (including initial period, damage level, postyield stiffness ratio, ultimate ductility factor and hysteretic behavior). The differences in damage-based SRF spectra under offshore and onshore ground-motion records are also investigated. The results showed that the effects caused by offshore ground motions on the estimation of damage-based SRF are negligible, while the influence caused by the ultimate ductility factor can reach up to approximately 50 %. Analytical estimates of damage-based SRFs for mean level, 10th percentile values and 90th percentile values in terms of period, damage index, and ultimate ductility factor are proposed for the aseismic design of offshore structures.

本文研究了日本相模湾地区京信网892条海上地面运动记录对单自由度系统损伤强度折减系数的影响。基于损伤的SRF谱在统计上考虑了海上地震动特征（如海底台站、震级、震中距离、显著持续时间和平均周期）和结构参数（包括初始周期、损伤水平、场后刚度比、极限延性系数和滞后行为）。研究了基于损伤的SRF谱在陆上和海上地震动记录下的差异。结果表明，海上地震动对基于损伤的SRF估计的影响可以忽略不计，而极限延性系数的影响可达50%左右。提出了基于损伤的srf均值、第10百分位值和第90百分位值的周期、损伤指数和极限延性系数的分析估计，用于海上结构抗震设计。

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引用次数: 0

Corrigendum to “Analysis on the mechanical properties of TPJ foundation during scour development under different wave and current parameters” [Marine Structures, Volume 104, 15 October 2025, 103899] “不同波浪和水流参数下TPJ地基冲刷发展过程中的力学特性分析”的勘误[海洋结构，104卷，2025年10月15日，103899]

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-09-21 DOI: 10.1016/j.marstruc.2025.103943

Ning Wang , Ruihu Zhu , Qiming Wang , Siyuan He , Ling Qiu

引用次数: 0

An integrated hydrodynamic module of FOWTs using accelerated BEM solver and modified Morison coefficients 利用加速边界元求解器和修正的莫里森系数，建立了一种集成的流体力学模型

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-09-05 DOI: 10.1016/j.marstruc.2025.103928

Lilin Wang , Long Teng , Yuliang Liu , Lizhong Wang , Zhen Guo

Hydrodynamics is critical to the stability and safety of floating offshore wind turbines (FOWTs). To improve computational efficiency in the preliminary design stage, frequency-to-time domain potential flow method combined with the Morison equation are commonly used. However, this method lack systematic validation and require multiple tools, leading to complex workflows and inefficient data transfer. To address these challenges, an integrated hydrodynamic module named Zwave is presented in this study, aiming to streamline wave generation, meshing, potential flow analysis, and viscous force calculation. It incorporates advanced features such as parameterized meshing, an accelerated boundary element solver, and amplitude- and frequency-dependent Morison coefficients. Component-level verification shows that Zwave accurately reproduces target wave spectra, and its hydrodynamic results align well with WAMIT in the frequency domain and Orcaflex in the time domain. Furthermore, with corrected Morison coefficients, Zwave successfully captures the resonance responses observed in wave basin tests. Building upon this, system-level validation is performed using field measurements from the Fukushima 2 MW FOWT, demonstrating good agreement in tower base and top bending moments under various sea states.

流体力学对浮式海上风力发电机的稳定性和安全性至关重要。为了提高初始设计阶段的计算效率，通常采用结合Morison方程的频域-时域势流法。然而，这种方法缺乏系统的验证，需要多种工具，导致工作流程复杂，数据传输效率低下。为了解决这些挑战，本研究提出了一个名为Zwave的集成流体动力学模块，旨在简化波浪生成，网格划分，势流分析和粘性力计算。它结合了先进的功能，如参数化网格，加速边界元求解器，以及依赖于振幅和频率的莫里森系数。分量级验证表明，Zwave能准确再现目标波谱，其水动力结果与WAMIT在频域和Orcaflex在时域上吻合较好。此外，通过校正Morison系数，Zwave成功捕获了波盆试验中观测到的共振响应。在此基础上，利用福岛2mw FOWT的现场测量进行了系统级验证，证明了在各种海况下塔底和顶部弯矩的良好一致性。

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引用次数: 0

Residual ultimate strength of a damaged deck grillage structure 受损甲板梁架结构的剩余极限强度

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-10-15 DOI: 10.1016/j.marstruc.2025.103950

Malcolm Smith , Ken Nahshon , Teresa Magoga , Joel Hogan , Rachel Markert , Joel Higgins

A deck grillage structure was extracted from a decommissioned warship (ex-HMCS IROQUOIS) and damaged as the result of a dynamic pressure loading test, resulting in overall permanent multi-bay deformation of the plating and attached members. The damaged grillage was then re-configured for residual ultimate strength testing under longitudinal loading. The test article spanned three complete frame bays plus half-bays at each end and four continuous longitudinals of the original structure. In addition to thickness and material property measurements, Light Detection and Ranging (LiDAR) measurement of the damaged panel was carried out after re-configuration. The residual strength testing consisted of compressive loading to collapse and post-collapse, followed by two tension-compression cycles. Numerical assessments of the residual strength were performed using nonlinear finite element analysis (FEA) and material models based on measured material properties from material recovered from the ship. Excellent agreement is achieved between the measured and predicted load-shortening behaviour through progressive adjustment of the material modelling parameters. The deformation damage is estimated to result in a 20.7% loss of ultimate strength. The modelling approach developed here is then extended to the analysis of four previously-studied grillage structures recovered from the same vessel.

从一艘退役军舰（前hmcs IROQUOIS）上提取了甲板格栅结构，并在动压加载试验中损坏，导致钢板和附属构件整体永久性多湾变形。然后重新配置损坏的格栅进行纵向荷载下的残余极限强度测试。试验件跨越了三个完整的框架舱和两端的半舱，以及原始结构的四个连续纵向。除了厚度和材料性能测量外，重新配置后对损坏面板进行了光探测和测距（LiDAR）测量。残余强度试验包括破坏前的压缩加载和破坏后的压缩加载，然后是两个拉压循环。利用非线性有限元分析（FEA）和基于从船上回收的材料中测量的材料特性的材料模型对残余强度进行了数值评估。通过逐步调整材料建模参数，在测量和预测的载荷缩短行为之间取得了极好的一致性。变形损伤导致极限强度损失20.7%。这里开发的建模方法随后扩展到分析先前研究的四个从同一艘船中恢复的格栅结构。

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引用次数: 0

Newly fitted Van der Pol parameters for vortex-induced vibration and their application to a deep-sea mining riser 新拟合的涡激振动Van der Pol参数及其在深海采矿立管中的应用

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-10-10 DOI: 10.1016/j.marstruc.2025.103953

Zhiquan Zhou , Jiasong Wang

The stability of wake oscillator model prediction accuracy across varying conditions is a critical and widely studied topic. This study developed a wake oscillator model incorporating newly fitted Van der Pol parameters, derived through mathematical derivation coupled with experimental fitting. The model comprises structural dynamic equations and Van der Pol oscillators in the in-line and cross-flow directions, solved numerically via the central difference method. Comparison with several classical experimental data and other numerical studies illustrates the enhanced comprehensive accuracy of the model. Particularly, this modification effectively addresses the common underestimation of in-line amplitudes and maintains consistent performance across diverse operating conditions. Investigation of the vortex-induced vibrations in the deep-sea mining riser reveals that the application of the new parameters magnifies the vibration amplitude, especially the peaks. The phenomenon arises from localized energy accumulation and reduced phase velocity. The model effectively enhances the higher-order frequency components and modifies the sidelobe width of the dominant vibration frequency, preventing the occurrence of unforeseen resonance. Those variations are amplified as the flow velocity increases. The static displacement of the riser, governed by the mean drag coefficient, remains unaffected. This improvement establishes a foundation for predicting vortex-induced vibrations responses and ensuring operational safety of deep-sea mining risers.

尾流振荡器模型在不同条件下预测精度的稳定性是一个重要而广泛研究的课题。通过数学推导和实验拟合，建立了一个包含新拟合的范德波尔参数的尾流振荡器模型。该模型由结构动力学方程和内流方向和横流方向的范德波尔振子组成，采用中心差分法进行数值求解。与几个经典实验数据和其他数值研究结果的比较表明，该模型的综合精度有所提高。特别是，这种改进有效地解决了常见的在线振幅低估问题，并在不同的操作条件下保持一致的性能。对深海采矿隔水管涡激振动的研究表明，新参数的应用放大了振动幅值，特别是峰值。这种现象是由局域能量积累和相速度降低引起的。该模型有效地增强了高阶频率分量，修改了主导振动频率的旁瓣宽度，防止了非预期共振的发生。这些变化随着流速的增加而被放大。立管的静态位移不受平均阻力系数的影响。这一改进为预测深海采矿立管涡激振动响应和保证作业安全奠定了基础。

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引用次数: 0

Overlaid energy-on-force contour maps method for safe, efficient, and economic design of dual-elastic ship berthing dolphins 双弹性靠泊海豚安全、高效、经济设计的能量-力叠加等值线图方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-10-31 DOI: 10.1016/j.marstruc.2025.103958

Waldemar Magda

The paper explores safe, efficient, and economic design of ship berthing dolphins. Focus is on the real, dual-elastic performance of a modern marine modular rubber fender and a tubular steel-pile substructure of a berthing dolphin. Assuming the simultaneous absorption of a vessel’s berthing kinetic energy by two elastic components of the pile-fender berthing system, an explicit procedure is given for the selection of a steel-pile cross-section geometry in relation to a given size of the rubber fender unit. The procedure uses an easily applicable method of geometrically overlaid energy-on-force contour maps. The contour maps contain isolines of the minimum required potential energy of the berthing dolphin steel-pile substructure and the maximum reaction force of the marine rubber fender. Four example cases of the overlaid contour maps are presented and discussed practically. The application of the overlaid contour maps method assumes a full (100%) efficiency of the fender unit in energy absorption and fulfils a condition of geotechnical stability of the embedded steel-pile dolphin substructure. A practical application of the overlaid contour maps is illustrated by means of a worked example, assuming an oil tanker of 70,000 deadweight tonnes, realistic geometries of large-diameter berthing dolphin steel-piles, and a family of widely used Sumitomo modular rubber fenders. It is shown that the proposed method can serve as a convenient and simple design technique for the optimum selection of the required geometry of steel pile cross-section in relation to the size of the fender unit.

对船舶靠泊海豚的安全、高效、经济设计进行了探讨。重点是现代船用模块化橡胶护舷和停泊海豚的管状钢桩子结构的真实双弹性性能。假设桩-挡泥板靠泊系统的两个弹性构件同时吸收船舶的靠泊动能，给出了根据橡胶挡泥板单元的给定尺寸选择钢桩截面几何形状的明确程序。该程序使用了一种易于应用的几何叠加能量-力等高线图方法。等高线图包含了靠泊海豚钢桩下部结构所需的最小势能和船用橡胶护舷的最大反作用力的等高线。给出了四个叠加等高线图的实例，并进行了实际讨论。采用覆盖等高线图法，假定挡泥板单元的吸能效率为100%，满足钢桩内埋海豚式下部结构的岩土稳定性条件。通过一个工作实例说明了叠加等高线图的实际应用，假设一艘70,000载重吨的油轮，大直径停泊海豚钢桩的现实几何形状，以及广泛使用的Sumitomo模块化橡胶挡泥板系列。结果表明，该方法可作为一种方便、简便的设计方法，根据护舷单元的尺寸优化选择所需的钢桩截面几何形状。

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引用次数: 0

Ice loads on a bottomless cylinder under dynamic wave action: An experimental study 动波作用下无底圆筒冰载荷的实验研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-09-06 DOI: 10.1016/j.marstruc.2025.103902

Hongtao Li , Ersegun D. Gedikli , Zhengshun Cheng , Junji Sawamura , Raed Lubbad , Wenjun Lu

In this study, we report the results of a comprehensive experimental analysis of ice loads on a bottomless cylinder under dynamic wave action and explore advanced methods to identify, isolate, and quantify these loads. To achieve this, we investigate and discuss various system identification techniques, such as the Prony method, dynamic mode decomposition (DMD), and covariance-driven stochastic subspace identification (SSI-cov), highlighting their applicability to experimental data. We also employ advanced signal processing approaches, including Robust Principal Component Analysis (RPCA) and robust local regression, to separate ice loads from quasi-periodic wave loads. Our findings reveal that ice and wave loads exhibit a positive correlation with wave height. Further, when the wave height remains unchanged, the normalized collision duration increases with wave frequency and shows insignificant dependence on peak ice loads. Additionally, ice loads are found to be

3 \sim 4

times larger than wave loads. These results contribute to advancing our understanding of wave–ice–structure interactions and provide practical insights for designing resilient offshore structures in ice-infested waters.

在这项研究中，我们报告了在动力波浪作用下无底圆柱体上冰载荷的综合实验分析结果，并探索了识别、隔离和量化这些载荷的先进方法。为了实现这一目标，我们研究和讨论了各种系统识别技术，如proony方法、动态模态分解（DMD）和协方差驱动的随机子空间识别（SSI-cov），并强调了它们对实验数据的适用性。我们还采用了先进的信号处理方法，包括鲁棒主成分分析（RPCA）和鲁棒局部回归，以分离冰载荷和准周期波载荷。我们的研究结果表明，冰和波浪荷载与浪高呈正相关。当波高不变时，归一化碰撞持续时间随波频增加而增加，与峰值冰荷载的关系不明显。此外，冰荷载比波浪荷载大3 ~ 4倍。这些结果有助于提高我们对波浪-冰-结构相互作用的理解，并为在结冰水域设计弹性离岸结构提供实用的见解。

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引用次数: 0

Data-driven surface reconstruction for assessing welding-induced distortions in ship-deck panels 船舶甲板板焊接变形评估的数据驱动表面重建

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-01-30 Epub Date: 2025-11-18 DOI: 10.1016/j.marstruc.2025.103970

Matti Christmann , Federica Mancini , Heikki Remes

Increasingly stringent regulations on greenhouse gas emissions have sparked interest in lightweight, thin-walled deck panels for cruise ship superstructures. Throughout the ship assembly, irregular welding-induced distortions accumulate on thin plates, affecting their load-carrying capacity significantly. Due to complex geometries, the assessment of distorted thin-walled panel units relies on accurate finite element modeling based on high-density optical scanning measurements, provided as unorganized point clouds (PC). This poses challenges in terms of processing of the data for surface reconstruction and data storage. This paper presents a computationally efficient, iterative B-spline surface fitting procedure for surface reconstruction from an unorganized 3D PC for the finite element analysis of distorted thin-deck panels. The method achieves a minimum geometric reconstruction accuracy of 0.08 mm and structural strain predictions mostly within 89% accuracy, validated against uni-axial monotonic tensile experiments on full-scale panels. Additionally, the proposed procedure reduces the file size to less than 1% of the original, thus representing a valuable solution for the handling of large sets of data from the scanning of multiple decks in ship superstructures. These results highlight the method’s potential for improving the assessment and quality control of thin-walled ship superstructures.

越来越严格的温室气体排放法规引发了人们对游轮上层建筑轻质薄壁甲板板的兴趣。在整个船舶装配过程中，薄板上的不规则焊接变形会累积，严重影响薄板的承载能力。由于复杂的几何形状，变形薄壁面板单元的评估依赖于基于高密度光学扫描测量的精确有限元建模，以无组织点云（PC）的形式提供。这对地表重建和数据存储的数据处理提出了挑战。本文提出了一种计算效率高、可迭代的b样条曲面拟合方法，用于变形薄板有限元分析的无组织三维PC曲面重建。该方法的几何重构精度最低为0.08 mm，结构应变预测精度在89%以内，并通过全尺寸板单轴单调拉伸实验进行了验证。此外，所提出的程序将文件大小减少到原始文件的1%以下，因此对于处理来自船舶上层建筑多个甲板扫描的大量数据来说，这是一个有价值的解决方案。这些结果突出了该方法在改善薄壁船舶上部结构的评估和质量控制方面的潜力。

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引用次数: 0