Marine Structures最新文献_第5页

Dynamic response of large-scale offshore wind turbine considering spatiotemporal typhoon impact 考虑台风时空影响的大型海上风力机动力响应

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-12-02 DOI: 10.1016/j.marstruc.2025.103967

Hao Wang , Fa Li , Zhitong Lv , Shitang Ke , Bofeng Xu , Tongguang Wang

Typhoon-induced failures of large offshore wind turbines (LOWTs) remain prevalent, with the uncertainty of typhoon hazards being a central scientific debate. Critical knowledge gaps persist regarding spatiotemporal typhoon impact on LOWTs’ dynamic behavioral features. This study establishes a Typhoon-LOWT analysis framework to investigate typhoon-affected dynamic responses through validated numerical simulations of historically typhoon events, incorporating full-coupled aerodynamic-hydrodynamic-servo-structural modeling. Systematic comparisons were performed between: (i) temporal variations in dynamic responses of the same LOWT and (ii) spatial variations among multiple LOWTs under synchronized typhoon conditions. Key findings reveal that structural response variability (coefficients of variation COV = 0.99 for blade tip displacement, 1.09 for platform sway) substantially exceeds inflow variability (COV=0.59 for hub wind speed), demonstrating the invalidity of linear extrapolation for extreme typhoon condition design. Cross-flow dominance observed under EWA (Eyewall Area)/FES (Front Eyewall Stage)/BES (Back Eyewall Stage) conditions compromises structural safety through fundamentally distinct mechanisms: along-flow responses show inflow insensitivity, whereas cross-flow counterparts exhibit intensity-dependent energy redistribution. The positive feedback loops driven by aero-hydro-structural interaction are identified with fundamental implications for the mitigation of cross-flow vibration. This investigation deciphers differential structural performances among co-located LOWTs during the same typhoon events, identifying cross-flow vibration predominance as a critical safety imperative.

台风引起的大型海上风力涡轮机（LOWTs）故障仍然普遍存在，台风危害的不确定性是一个核心的科学辩论。关于台风对低低压动力行为特征的时空影响的关键知识差距仍然存在。本研究建立了台风-低低压分析框架，通过对历史台风事件的有效数值模拟，结合空气动力-水动力-伺服结构全耦合建模，研究台风影响的动力响应。系统比较了台风同步条件下同一低气压系统动力响应的时间变化和多个低气压系统的空间变化。主要研究结果表明，结构响应变异性（叶尖位移的变异系数COV= 0.99，平台摆动的变异系数COV= 1.09）大大超过流入变异性（轮毂风速的变异系数COV=0.59），证明了线性外推法在极端台风条件设计中的有效性。在EWA（眼壁区域）/FES（前眼壁阶段）/BES（后眼壁阶段）条件下观察到的横流优势通过根本不同的机制损害结构安全：沿流响应显示流入不敏感，而横流对应表现出强度依赖的能量再分配。确定了由气动-水-结构相互作用驱动的正反馈回路，这对减轻横流振动具有重要意义。这项研究揭示了在同一台风事件中，位于同一地点的低海拔交通枢纽的不同结构性能，确定了横向流动振动优势是一个关键的安全要求。

{"title":"Dynamic response of large-scale offshore wind turbine considering spatiotemporal typhoon impact","authors":"Hao Wang , Fa Li , Zhitong Lv , Shitang Ke , Bofeng Xu , Tongguang Wang","doi":"10.1016/j.marstruc.2025.103967","DOIUrl":"10.1016/j.marstruc.2025.103967","url":null,"abstract":"<div><div>Typhoon-induced failures of large offshore wind turbines (LOWTs) remain prevalent, with the uncertainty of typhoon hazards being a central scientific debate. Critical knowledge gaps persist regarding spatiotemporal typhoon impact on LOWTs’ dynamic behavioral features. This study establishes a Typhoon-LOWT analysis framework to investigate typhoon-affected dynamic responses through validated numerical simulations of historically typhoon events, incorporating full-coupled aerodynamic-hydrodynamic-servo-structural modeling. Systematic comparisons were performed between: (i) temporal variations in dynamic responses of the same LOWT and (ii) spatial variations among multiple LOWTs under synchronized typhoon conditions. Key findings reveal that structural response variability (coefficients of variation COV = 0.99 for blade tip displacement, 1.09 for platform sway) substantially exceeds inflow variability (COV=0.59 for hub wind speed), demonstrating the invalidity of linear extrapolation for extreme typhoon condition design. Cross-flow dominance observed under EWA (Eyewall Area)/FES (Front Eyewall Stage)/BES (Back Eyewall Stage) conditions compromises structural safety through fundamentally distinct mechanisms: along-flow responses show inflow insensitivity, whereas cross-flow counterparts exhibit intensity-dependent energy redistribution. The positive feedback loops driven by aero-hydro-structural interaction are identified with fundamental implications for the mitigation of cross-flow vibration. This investigation deciphers differential structural performances among co-located LOWTs during the same typhoon events, identifying cross-flow vibration predominance as a critical safety imperative.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"107 ","pages":"Article 103967"},"PeriodicalIF":5.1,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694711","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

Framework for the assessment of ship hull girder reliability and related sensitivity analysis considering accidental damage and ageing 考虑意外损伤和老化的船体梁可靠性评估框架及敏感性分析

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-12-02 DOI: 10.1016/j.marstruc.2025.103986

Krzysztof Woloszyk , Jakub Montewka , Floris Goerlandt , Bruno Sudret

The present study proposes a comprehensive framework for assessing the reliability of a ship hull girder and its sensitivity to key input variables, with particular consideration of accidental hull damage and age-related corrosion. To this end, the physics-based model used to compute the ultimate strength is substituted with a surrogate model based on Polynomial Chaos Expansion. The reliability problem is formulated by incorporating both still-water and wave-induced bending loads. The effects of various parameters, including vessel age (which is associated with corrosion progression), operational region, loading condition, and accidental damage, are systematically examined. The analysis reveals that ship size, operational region, and the specific damage scenario significantly influence the probability of hull failure, thereby highlighting the need for further investigation. The proposed framework offers potential application in risk-based ship design.

本研究提出了一个全面的框架来评估船体梁的可靠性及其对关键输入变量的敏感性，特别是考虑意外船体损伤和与年龄相关的腐蚀。为此，将计算极限强度的物理模型替换为基于多项式混沌展开的代理模型。可靠性问题是通过结合静水和波浪弯曲载荷来制定的。系统地检查了各种参数的影响，包括容器年龄（与腐蚀进展有关）、操作区域、加载条件和意外损坏。分析表明，船舶尺寸、作战区域和具体损伤情景对船体失效概率有显著影响，因此强调了进一步研究的必要性。提出的框架在基于风险的船舶设计中具有潜在的应用前景。

引用次数: 0

Influence of ship manoeuvres on collision damage 船舶操纵对碰撞损伤的影响

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-29 DOI: 10.1016/j.marstruc.2025.103971

Šimun Sviličić, Smiljko Rudan, Ivan Ćatipović, Jerolim Andrić

Ship collisions, though infrequent, can result in severe consequences, including the loss of human life, ships, or cargo, as well as substantial environmental damage. This paper presents a comprehensive study of ship collision phenomena by analysing two key aspects: pre-collision manoeuvres under different rudder angles and comparative collision scenarios involving varying parameters such as impact angle and ship velocity. The study begins by examining various manoeuvres a ship can perform to minimise the risk of collision, taking into account positional and hydrodynamic factors. The second part of the study evaluates collision scenarios through a risk assessment framework, contrasting a high-risk collision scenario with a low-risk scenario, both modelled under the assumption of human error. Both analyses use rotational velocity and acceleration metrics derived from a three-degrees-of-freedom (3DOF) manoeuvrability model established in the first part. Simulations are conducted using LS-DYNA. The model incorporates hydrodynamic forces generated during the collision, as well as forces resulting from ship manoeuvring. The KVLCC2 serves as a case study, with its hydrodynamic properties - such as added mass and viscous damping, determined using Hydrostar software for integration into the Mitsubishi Collision Code (MCOL) boundary condition. The results indicate that large rudder angles (±40°) significantly reduce collision energy and penetration depth compared to no manoeuvre, while higher collision angles also mitigate structural deformation. The findings confirm that incorporating manoeuvrability into collision simulations improves predictive accuracy and provides valuable insight for assessing ship safety and collision prevention strategies.

船舶碰撞虽然不经常发生，但可造成严重后果，包括人员、船舶或货物的损失，以及严重的环境破坏。本文对船舶碰撞现象进行了全面的研究，分析了两个关键方面：不同舵角下的碰撞前操纵和不同参数（如冲击角和航速）下的比较碰撞情景。这项研究首先考察了船舶在考虑位置和水动力因素的情况下，可以采取的各种措施，以尽量减少碰撞的风险。研究的第二部分通过风险评估框架评估碰撞场景，将高风险碰撞场景与低风险场景进行对比，两者都是在人为错误假设下建模的。这两种分析都使用了从第一部分建立的三自由度（3DOF）机动性模型中导出的转速和加速度指标。利用LS-DYNA进行了仿真。该模型结合了碰撞过程中产生的水动力，以及船舶操纵产生的力。KVLCC2以其流体动力学特性为例，例如增加质量和粘性阻尼，使用Hydrostar软件确定，并将其集成到三菱碰撞代码（MCOL）边界条件中。结果表明，与无操纵相比，大舵角（±40°）可显著降低碰撞能量和穿透深度，同时更大的碰撞角也能减轻结构变形。研究结果证实，将机动性纳入碰撞模拟可以提高预测准确性，并为评估船舶安全和碰撞预防策略提供有价值的见解。

{"title":"Influence of ship manoeuvres on collision damage","authors":"Šimun Sviličić, Smiljko Rudan, Ivan Ćatipović, Jerolim Andrić","doi":"10.1016/j.marstruc.2025.103971","DOIUrl":"10.1016/j.marstruc.2025.103971","url":null,"abstract":"<div><div>Ship collisions, though infrequent, can result in severe consequences, including the loss of human life, ships, or cargo, as well as substantial environmental damage. This paper presents a comprehensive study of ship collision phenomena by analysing two key aspects: pre-collision manoeuvres under different rudder angles and comparative collision scenarios involving varying parameters such as impact angle and ship velocity. The study begins by examining various manoeuvres a ship can perform to minimise the risk of collision, taking into account positional and hydrodynamic factors. The second part of the study evaluates collision scenarios through a risk assessment framework, contrasting a high-risk collision scenario with a low-risk scenario, both modelled under the assumption of human error. Both analyses use rotational velocity and acceleration metrics derived from a three-degrees-of-freedom (3DOF) manoeuvrability model established in the first part. Simulations are conducted using LS-DYNA. The model incorporates hydrodynamic forces generated during the collision, as well as forces resulting from ship manoeuvring. The KVLCC2 serves as a case study, with its hydrodynamic properties - such as added mass and viscous damping, determined using Hydrostar software for integration into the Mitsubishi Collision Code (MCOL) boundary condition. The results indicate that large rudder angles (±40°) significantly reduce collision energy and penetration depth compared to no manoeuvre, while higher collision angles also mitigate structural deformation. The findings confirm that incorporating manoeuvrability into collision simulations improves predictive accuracy and provides valuable insight for assessing ship safety and collision prevention strategies.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"107 ","pages":"Article 103971"},"PeriodicalIF":5.1,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624800","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 numerical study on flow-induced vibration of a buoy-mooring system 浮筒系泊系统流激振动的数值研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-26 DOI: 10.1016/j.marstruc.2025.103975

Hanxu Zheng , Mingda Li , Jiasong Wang , Sai Zeng , Dongying Wang , Xiaoyang Hu

This study numerically investigates the Flow-Induced-Vibration (FIV) of a Buoy-Mooring System (BMS), with a particular emphasis on the hydrodynamic coupling between the mooring cable’s vortex-induced vibration (VIV) and the buoy’s vortex-induced motion (VIM). Simulations are conducted across a range of controlled inflow velocities to systematically analyze the time–frequency characteristics of the FIV responses, associated energy transfer mechanisms, and vortex formation patterns. Supplementary two-dimensional (2D) simulations are employed to validate key findings from the three-dimensional (3D) simulations. The system dynamics become VIM-dominant when the buoy undergoes significant oscillatory motion, leading to synchronized, low-frequency, large-amplitude displacements in both structural components. The substantial oscillation amplitude induced by the buoy’s VIM causes the cable to experience cross-flow CF oscillation flow, which in turn generates in-line (IL) vibration components at distinct frequencies. The high-frequency IL vibration component originates from the periodic shedding or sliding of vortex pairs attached to the cable, while a low-frequency IL component emerges exclusively under high-frequency CF oscillations, facilitated by enhanced vortex detachment and shortened CF oscillation cycles. Notably, a higher incoming flow velocity promote downstream advection of shed vortices and attenuates the low-frequency IL vibration component.

本文对浮筒-系泊系统（BMS）的流激振动（FIV）进行了数值研究，重点研究了系泊索涡激振动（VIV）与浮筒涡激运动（VIM）之间的水动力耦合。在控制的流入速度范围内进行了模拟，系统地分析了FIV响应的时频特性、相关的能量传递机制和涡流形成模式。补充的二维（2D）模拟用于验证三维（3D）模拟的关键发现。当浮标发生显著的振荡运动时，系统动力学成为vim主导，导致两个结构部件同步、低频、大幅度位移。浮标的VIM引起的大量振荡幅值使电缆经历了横流CF振荡流，从而产生了不同频率的在线（IL）振动分量。高频IL振动分量来源于附着在电缆上的涡流对的周期性脱落或滑动，而低频IL分量只出现在高频CF振荡中，这是由于涡流分离增强和CF振荡周期缩短所促成的。值得注意的是，较高的来流速度促进了脱落涡的下游平流，并减弱了低频IL振动分量。

{"title":"A numerical study on flow-induced vibration of a buoy-mooring system","authors":"Hanxu Zheng , Mingda Li , Jiasong Wang , Sai Zeng , Dongying Wang , Xiaoyang Hu","doi":"10.1016/j.marstruc.2025.103975","DOIUrl":"10.1016/j.marstruc.2025.103975","url":null,"abstract":"<div><div>This study numerically investigates the Flow-Induced-Vibration (FIV) of a Buoy-Mooring System (BMS), with a particular emphasis on the hydrodynamic coupling between the mooring cable’s vortex-induced vibration (VIV) and the buoy’s vortex-induced motion (VIM). Simulations are conducted across a range of controlled inflow velocities to systematically analyze the time–frequency characteristics of the FIV responses, associated energy transfer mechanisms, and vortex formation patterns. Supplementary two-dimensional (2D) simulations are employed to validate key findings from the three-dimensional (3D) simulations. The system dynamics become VIM-dominant when the buoy undergoes significant oscillatory motion, leading to synchronized, low-frequency, large-amplitude displacements in both structural components. The substantial oscillation amplitude induced by the buoy’s VIM causes the cable to experience cross-flow CF oscillation flow, which in turn generates in-line (IL) vibration components at distinct frequencies. The high-frequency IL vibration component originates from the periodic shedding or sliding of vortex pairs attached to the cable, while a low-frequency IL component emerges exclusively under high-frequency CF oscillations, facilitated by enhanced vortex detachment and shortened CF oscillation cycles. Notably, a higher incoming flow velocity promote downstream advection of shed vortices and attenuates the low-frequency IL vibration component.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103975"},"PeriodicalIF":5.1,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623035","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 damage identification by finite element model updating using transmissibility functions data: Numerical and experimental study 利用传递函数数据更新有限元模型的结构损伤识别：数值与实验研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-24 DOI: 10.1016/j.marstruc.2025.103968

Shahriar Baybordi, Akbar Esfandiari, Ahmad Izadi

A significant challenge in structural damage detection and finite element model (FEM) updating, particularly for large structures, is the difficulty of structural excitation and response measurement. However, the structures can be excited in some manner such as dropped weight while the force measurement is not possible. This study introduces a novel transmissibility function-based approach for structural FEM updating. Compared to other frequency response-based techniques, this method generates more data and equations. The proposed sensitivity relation, operating at an exact sensitivity level, improves equation accuracy by directly integrating measured data into the sensitivity matrix relations. The efficiency of this proposed approach is validated through numerical simulations of three-dimensional jacket platform and plate models considering measurement and modeling uncertainties. The results demonstrate the method's high accuracy in identifying damage locations and severities. Additionally, the method's abilities are assessed through experimental investigations on a ship hull and a 2D frame. The model updating results by the proposed method proves its capability for structural FEM updating and damage detection.

结构损伤检测和有限元模型更新的一个重要挑战是结构激励和响应测量的困难，特别是对于大型结构。然而，在无法测量力的情况下，结构可以以某种方式（如重物掉落）被激发。提出了一种基于传递函数的结构有限元更新方法。与其他基于频率响应的方法相比，该方法产生更多的数据和方程。所提出的灵敏度关系在精确的灵敏度水平上运行，通过将测量数据直接集成到灵敏度矩阵关系中，提高了方程的精度。通过考虑测量和建模不确定性的三维夹套平台和板模型的数值模拟，验证了该方法的有效性。结果表明，该方法具有较高的损伤位置和损伤程度识别精度。此外，通过船体和二维框架的实验研究，对该方法的能力进行了评估。模型更新结果表明，该方法具有较好的结构有限元更新和损伤检测能力。

{"title":"Structural damage identification by finite element model updating using transmissibility functions data: Numerical and experimental study","authors":"Shahriar Baybordi, Akbar Esfandiari, Ahmad Izadi","doi":"10.1016/j.marstruc.2025.103968","DOIUrl":"10.1016/j.marstruc.2025.103968","url":null,"abstract":"<div><div>A significant challenge in structural damage detection and finite element model (FEM) updating, particularly for large structures, is the difficulty of structural excitation and response measurement. However, the structures can be excited in some manner such as dropped weight while the force measurement is not possible. This study introduces a novel transmissibility function-based approach for structural FEM updating. Compared to other frequency response-based techniques, this method generates more data and equations. The proposed sensitivity relation, operating at an exact sensitivity level, improves equation accuracy by directly integrating measured data into the sensitivity matrix relations. The efficiency of this proposed approach is validated through numerical simulations of three-dimensional jacket platform and plate models considering measurement and modeling uncertainties. The results demonstrate the method's high accuracy in identifying damage locations and severities. Additionally, the method's abilities are assessed through experimental investigations on a ship hull and a 2D frame. The model updating results by the proposed method proves its capability for structural FEM updating and damage detection.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103968"},"PeriodicalIF":5.1,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623034","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 novel dual jack-up installation platforms synchronized construction method for sinking tube of submerged floating tunnel 沉浮隧道沉管双自升式安装平台同步施工新方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-20 DOI: 10.1016/j.marstruc.2025.103974

Fang Wang , Jing Li , Jianyun Chen , Qiang Xu

Research on submerged floating tunnels has primarily focused on conceptual analysis, with comparatively limited advances in installation techniques and construction control. This study proposes an innovative construction concept for sinking tube of submerged floating tunnel. The core technology lies in a synchronized operation system utilizing dual jack-up installation platforms. First, a novel jack-up installation platform was designed. Key components such as the platform hull, truss-type pile legs, and rack-and-pinion jacking systems were detailed. Second, critical steps and construction procedures for applying this method to sinking tube were systematically outlined. Finally, a multi-body dynamic response simulation was conducted to analyze the sinking tube operation. The effects of wave and current loads on the motion response of the sinking tube and platforms, as well as mooring line tensions, were discussed. The results indicate that the proposed method offers significant operational advantages, exhibiting robust performance even under extreme wave conditions. This approach effectively extends the available construction time window for sinking operations of submerged floating tunnels.

沉浮隧道的研究主要集中在概念分析上，在安装技术和施工控制方面的进展相对有限。本研究提出了一种创新的沉管施工理念。核心技术在于采用双自升式安装平台的同步作业系统。首先，设计了一种新型自升式安装平台。详细介绍了平台船体、桁架式桩腿和齿条-齿轮顶升系统等关键部件。其次，系统地概述了将该方法应用于沉管的关键步骤和施工程序。最后进行了多体动力响应仿真，分析了沉管运行过程。讨论了波浪和电流载荷对沉管和平台的运动响应以及系缆张力的影响。结果表明，该方法具有显著的操作优势，即使在极端波浪条件下也具有鲁棒性。该方法有效地延长了沉浮隧道沉陷作业的施工时间窗口。

{"title":"A novel dual jack-up installation platforms synchronized construction method for sinking tube of submerged floating tunnel","authors":"Fang Wang , Jing Li , Jianyun Chen , Qiang Xu","doi":"10.1016/j.marstruc.2025.103974","DOIUrl":"10.1016/j.marstruc.2025.103974","url":null,"abstract":"<div><div>Research on submerged floating tunnels has primarily focused on conceptual analysis, with comparatively limited advances in installation techniques and construction control. This study proposes an innovative construction concept for sinking tube of submerged floating tunnel. The core technology lies in a synchronized operation system utilizing dual jack-up installation platforms. First, a novel jack-up installation platform was designed. Key components such as the platform hull, truss-type pile legs, and rack-and-pinion jacking systems were detailed. Second, critical steps and construction procedures for applying this method to sinking tube were systematically outlined. Finally, a multi-body dynamic response simulation was conducted to analyze the sinking tube operation. The effects of wave and current loads on the motion response of the sinking tube and platforms, as well as mooring line tensions, were discussed. The results indicate that the proposed method offers significant operational advantages, exhibiting robust performance even under extreme wave conditions. This approach effectively extends the available construction time window for sinking operations of submerged floating tunnels.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103974"},"PeriodicalIF":5.1,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579179","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

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 : 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。

{"title":"Deep learning-based damage localization method for strain analysis of jacket offshore platform structures","authors":"Shufeng Feng, Lei Song, Zhuoyi Yang, Tengfei Sun, Kai Wu, Peng Liu, Qilong Wu, Jiarui Huang","doi":"10.1016/j.marstruc.2025.103972","DOIUrl":"10.1016/j.marstruc.2025.103972","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103972"},"PeriodicalIF":5.1,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579180","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 the axial load recovery characteristics of damaged tensile armour layers in flexible marine cables 船用柔性电缆受损抗拉护层轴向载荷恢复特性研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-19 DOI: 10.1016/j.marstruc.2025.103969

Qingzhen Lu , Weining Wu , Yuanchao Yin , Yunxin Xie , Bin Feng , Jun Yan , Hailong Lu

In flexible marine cables, the axial load-bearing capacity of a damaged tensile armour layer tends to recover gradually along its axial length. The aim of this study is to determine the specific impact of tensile armour layer damage on axial load capacity, to analyse the axial mechanical behaviour of both intact and damaged tensile armour layers, and to obtain the recovery length after damage. A typical single-layer helically wound structure is selected as the research object, and a fully three-dimensional refined finite element model is established to simulate local damage and interlayer friction. Additionally, optical frequency domain reflectometry (OFDR) experimental analysis is employed to continuously observe the strain responses before and after damage, verifying the applicability of the finite element model and determining the load recovery length of the tensile armour layer under prefabricated damage conditions. Furthermore, key parameters affecting interlayer friction, including the friction coefficient, external pressure, and helical winding angle, are analysed. The results indicate that as the friction coefficient increases from 0.1 to 0.4, the external pressure increases from 0.25 MPa to 0.75 MPa, and the winding angle increases from 10° to 30°, the load recovery length decreases by 53.0 %, 43.9 %, and 44.3 %, respectively. This study provides scientific support for the operational maintenance of damaged tensile armour layers in flexible cables.

在船用柔性电缆中，受损抗拉护层的轴向承载能力沿其轴向长度逐渐恢复。本研究的目的是确定拉伸装甲层损伤对轴向承载能力的具体影响，分析完整和受损拉伸装甲层的轴向力学行为，并获得损伤后的恢复长度。选取典型单层螺旋缠绕结构作为研究对象，建立全三维精细有限元模型，模拟局部损伤和层间摩擦。采用光学频域反射（OFDR）实验分析，连续观察损伤前后的应变响应，验证有限元模型的适用性，确定预制损伤条件下拉伸装甲层的载荷恢复长度。分析了影响层间摩擦的关键参数，包括摩擦系数、外压力和螺旋缠绕角。结果表明：当摩擦系数从0.1增加到0.4，外压力从0.25 MPa增加到0.75 MPa，缠绕角从10°增加到30°时，载荷恢复长度分别减少53.0%、43.9%和44.3%；该研究为柔性电缆受损抗拉护层的运行维护提供了科学依据。

{"title":"Study on the axial load recovery characteristics of damaged tensile armour layers in flexible marine cables","authors":"Qingzhen Lu , Weining Wu , Yuanchao Yin , Yunxin Xie , Bin Feng , Jun Yan , Hailong Lu","doi":"10.1016/j.marstruc.2025.103969","DOIUrl":"10.1016/j.marstruc.2025.103969","url":null,"abstract":"<div><div>In flexible marine cables, the axial load-bearing capacity of a damaged tensile armour layer tends to recover gradually along its axial length. The aim of this study is to determine the specific impact of tensile armour layer damage on axial load capacity, to analyse the axial mechanical behaviour of both intact and damaged tensile armour layers, and to obtain the recovery length after damage. A typical single-layer helically wound structure is selected as the research object, and a fully three-dimensional refined finite element model is established to simulate local damage and interlayer friction. Additionally, optical frequency domain reflectometry (OFDR) experimental analysis is employed to continuously observe the strain responses before and after damage, verifying the applicability of the finite element model and determining the load recovery length of the tensile armour layer under prefabricated damage conditions. Furthermore, key parameters affecting interlayer friction, including the friction coefficient, external pressure, and helical winding angle, are analysed. The results indicate that as the friction coefficient increases from 0.1 to 0.4, the external pressure increases from 0.25 MPa to 0.75 MPa, and the winding angle increases from 10° to 30°, the load recovery length decreases by 53.0 %, 43.9 %, and 44.3 %, respectively. This study provides scientific support for the operational maintenance of damaged tensile armour layers in flexible cables.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103969"},"PeriodicalIF":5.1,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579061","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

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 : 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。

{"title":"Data-driven surface reconstruction for assessing welding-induced distortions in ship-deck panels","authors":"Matti Christmann , Federica Mancini , Heikki Remes","doi":"10.1016/j.marstruc.2025.103970","DOIUrl":"10.1016/j.marstruc.2025.103970","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103970"},"PeriodicalIF":5.1,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579062","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

Evaluation of limited coupled numerical models with damping correction for TLP floating offshore wind turbine 考虑阻尼修正的TLP浮式海上风力机有限耦合数值模型评估

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-11-14 DOI: 10.1016/j.marstruc.2025.103954

Jianing Guo , Mingyue Liu , Yuchao Jia , Shuai Li , Can Yang , Shenglong Zhu

A two-tier limited coupled model (LCM) framework is developed and validated for horizontal-axis tension leg platform wind turbines (TLPWTs), focusing on efficient and reliable prediction of platform motions and tendon loads. In the first tier, Type I LCMs employ fixed-bottom turbine load inputs to predict extreme and mean responses within 15 % of fully coupled model (FCM) results. Deviations emerge when second-order sum-frequency wave loads are included, primarily due to the absence of real-time rotor-nacelle-assembly (RNA) damping, most significantly under pitch-resonant excitations. To mitigate this limitation, a second-order aerodynamic damping formulation is derived, capturing nonlinear aero-hydro interactions. The refined Type II LCM integrates Rayleigh damping applied to the tower to emulate global RNA damping effects. A two-stage data-driven calibration–validation procedure was implemented: short (360 s) FCM–LCM comparisons were used to calibrate damping parameters, followed by long (3600 s) validations. After calibration, Type II LCM errors were consistently below 6 % across motion and load statistics under both operational and parked conditions, including low-amplitude heave and pitch cases. Time-domain and spectral analyses confirmed agreement in dominant frequencies and energy distributions, with improved consistency at harsher sea states. Computational cost was reduced by approximately fivefold relative to FCMs while preserving fidelity. The two-tier framework thus provides stage-appropriate tools: Type I enables early design iterations when full turbine data are unavailable, while Type II offers cost-effective, high-fidelity analysis for platform response prediction, mooring system optimization, and extreme-condition assessment of TLPWTs.

针对水平轴张力腿平台风力涡轮机（TLPWTs），开发并验证了两层有限耦合模型（LCM）框架，重点是高效可靠地预测平台运动和肌腱载荷。在第一层，I型lcm采用固定底部涡轮负荷输入来预测完全耦合模型（FCM）结果的15%以内的极端和平均响应。当二阶和频波载荷包括在内时，偏差出现，主要是由于缺乏实时转子-机舱组件（RNA）阻尼，最明显的是在俯仰共振激励下。为了减轻这一限制，我们推导了二阶气动阻尼公式，以捕获非线性气动-水力相互作用。改进的II型LCM集成了应用于塔的瑞利阻尼，以模拟全局RNA阻尼效应。采用数据驱动的两阶段校准-验证程序：使用短时间（360秒）FCM-LCM比较来校准阻尼参数，然后进行长时间（3600秒）验证。经过校准，II型LCM在运行和停车条件下的运动和负载统计误差始终低于6%，包括低振幅起伏和俯仰情况。时域和频谱分析证实了主频率和能量分布的一致性，在恶劣的海况下一致性得到了提高。在保持保真度的同时，计算成本相对于fcm降低了大约五倍。因此，两层框架提供了适合阶段的工具：I型可在无法获得完整涡轮机数据时进行早期设计迭代，而II型可为平台响应预测、系泊系统优化和tlpwt的极端条件评估提供经济高效、高保真的分析。

{"title":"Evaluation of limited coupled numerical models with damping correction for TLP floating offshore wind turbine","authors":"Jianing Guo , Mingyue Liu , Yuchao Jia , Shuai Li , Can Yang , Shenglong Zhu","doi":"10.1016/j.marstruc.2025.103954","DOIUrl":"10.1016/j.marstruc.2025.103954","url":null,"abstract":"<div><div>A two-tier limited coupled model (LCM) framework is developed and validated for horizontal-axis tension leg platform wind turbines (TLPWTs), focusing on efficient and reliable prediction of platform motions and tendon loads. In the first tier, Type I LCMs employ fixed-bottom turbine load inputs to predict extreme and mean responses within 15 % of fully coupled model (FCM) results. Deviations emerge when second-order sum-frequency wave loads are included, primarily due to the absence of real-time rotor-nacelle-assembly (RNA) damping, most significantly under pitch-resonant excitations. To mitigate this limitation, a second-order aerodynamic damping formulation is derived, capturing nonlinear aero-hydro interactions. The refined Type II LCM integrates Rayleigh damping applied to the tower to emulate global RNA damping effects. A two-stage data-driven calibration–validation procedure was implemented: short (360 s) FCM–LCM comparisons were used to calibrate damping parameters, followed by long (3600 s) validations. After calibration, Type II LCM errors were consistently below 6 % across motion and load statistics under both operational and parked conditions, including low-amplitude heave and pitch cases. Time-domain and spectral analyses confirmed agreement in dominant frequencies and energy distributions, with improved consistency at harsher sea states. Computational cost was reduced by approximately fivefold relative to FCMs while preserving fidelity. The two-tier framework thus provides stage-appropriate tools: Type I enables early design iterations when full turbine data are unavailable, while Type II offers cost-effective, high-fidelity analysis for platform response prediction, mooring system optimization, and extreme-condition assessment of TLPWTs.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"106 ","pages":"Article 103954"},"PeriodicalIF":5.1,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145528181","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