Marine Structures最新文献

Influence of wave directional spreading of short-crested irregular waves on ship motions and wave loads

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-08 DOI: 10.1016/j.marstruc.2025.103825

Zhenwei Chen , Jialong Jiao , Yuanming Chen , Caixia Jiang , Shuai Chen

{"title":"Influence of wave directional spreading of short-crested irregular waves on ship motions and wave loads","authors":"Zhenwei Chen , Jialong Jiao , Yuanming Chen , Caixia Jiang , Shuai Chen","doi":"10.1016/j.marstruc.2025.103825","DOIUrl":"10.1016/j.marstruc.2025.103825","url":null,"abstract":"<div><div>The conventional ship seakeeping analysis are conducted under the assumption of uni-directional regular or irregular waves. However, full-scale real ships operate in sea states of three-dimensional multi-directional irregular waves. This paper simulates ship motions and load responses in short-crested irregular waves with various directional functions by using CFD-FEM method. First, the simulated waves with various directional functions are comparatively analyzed and validated. Then, ship motions and loads in different short-crested wave states and also in long-crested waves are comprehensively analyzed and compared from the aspect of time series, frequency spectra, statistical values and exceedance of probability. The effect of directional function of short-crested waves on ship motions and loads is comprehensively discussed, which provides useful regression formula for the rapid extrapolation and estimation of ship motions and loads in short-crested waves using the long-crested wave response results. This paper sheds light on the effect of wave directional spreading on ship motions and load responses.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103825"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799035","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

Dynamic configuration simulation of multi-branches towed array system

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-03 DOI: 10.1016/j.marstruc.2025.103819

Yi Zhang , Dapeng Zhang , Yifan Xie , Yining Zhang , Zhengjie Liang , Keqiang Zhu , Shutian Zhang

引用次数: 0

Experimental investigation on thermal response of stiffened panel under high-temperature gas leakage

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-01 DOI: 10.1016/j.marstruc.2025.103820

Yuchao Yuan , Yifei Yang , Li Guo , Wenyong Tang

{"title":"Experimental investigation on thermal response of stiffened panel under high-temperature gas leakage","authors":"Yuchao Yuan , Yifei Yang , Li Guo , Wenyong Tang","doi":"10.1016/j.marstruc.2025.103820","DOIUrl":"10.1016/j.marstruc.2025.103820","url":null,"abstract":"<div><div>High-temperature gas is widely used in ship power systems. As service time increases, pipeline damage will lead to high-temperature gas leakage which will cause structural expansion. The surrounding constraint will prevent the expansion resulting in thermal stress threatening the safety of the hull structure. There is limited research focusing on the impact of high-temperature gas leakage on the thermal response of structures. It is a complex fluid-structure coupling problem that should consider the gas diffusion, structural heat absorption and expansion to simulate the realistic gas leakage scenario. In this paper, to investigate the thermal response of stiffened panel under the action of high-temperature gas, a set of experimental equipment including a steam generation module, a stiffened panel and a signal acquisition module is designed. The effects of high temperature, leakage distance and leakage pressure on the thermal response of panel are investigated. The results show that the high-temperature gas will significantly amplify the stress response of the panel. The center of the panel which is directly opposite to the leakage hole shows an obvious impact effect. The leakage pressure affects the temperature distribution little and mainly influences the stress and displacement. The leakage distance has an effect on the temperature, stress and deformation distribution simultaneously. With the increase of the leakage distance, the extreme temperature, stress and displacement will reduce. The results can deepen the understanding of the mechanism of high-temperature gas leakage on structural thermal response and provide certain guidance to the numerical simulation and hull structural design.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103820"},"PeriodicalIF":4.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738034","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

G-Twin: Graph neural network-based digital twin for real-time and high-fidelity structural health monitoring for offshore wind turbines

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-01 DOI: 10.1016/j.marstruc.2025.103813

Chunhao Jiang , Nian-Zhong Chen

{"title":"G-Twin: Graph neural network-based digital twin for real-time and high-fidelity structural health monitoring for offshore wind turbines","authors":"Chunhao Jiang , Nian-Zhong Chen","doi":"10.1016/j.marstruc.2025.103813","DOIUrl":"10.1016/j.marstruc.2025.103813","url":null,"abstract":"<div><div>The development of digital twin (DT) of real-time and high-fidelity structural health monitoring (SHM) is critical for ensuring the structural safety of an offshore wind turbine (OWT) during its service life. However, reconstruction of high-fidelity stress field in SHM faces great challenges because the monitoring stress data from sensors is normally sparse and limited. In this study, a novel graph neural network (GNN)-based DT, named herein G-Twin, is proposed to reconstruct the high-fidelity stress field in real time using sparse monitoring data. In G-Twin, structures of an OWT are represented as graphs, with nodes and edges capturing the structural geometry in a non-Euclidean space. Graph features are designed as the sparse monitoring data and these features are iteratively aggregated and updated through a message-passing mechanism in terms of the local topology of the graph and the high-fidelity stress field is then achieved. Moreover, an enhanced Mixup technique is developed for data augmentation to minimize the prediction errors when the OWT is subjected to the extreme loading. A series of numerical experiments are conducted and the results show that the G-Twin can accurately predict the high-fidelity stress distribution of an OWT in terms of sparse sensor data in real time (the inference time for the G-Twin on a consumer-grade GPU is approximately 0.013 s on average). The proposed G-Twin has demonstrated its great capability and feasibility for DT of real-time and high-fidelity SHM for OWTs.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103813"},"PeriodicalIF":4.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738033","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

Efficient long-term extreme response and fatigue analysis of offshore structures under stochastic wave, current and wind loads

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-31 DOI: 10.1016/j.marstruc.2025.103815

Qingqing Miao, Ying Min Low

{"title":"Efficient long-term extreme response and fatigue analysis of offshore structures under stochastic wave, current and wind loads","authors":"Qingqing Miao, Ying Min Low","doi":"10.1016/j.marstruc.2025.103815","DOIUrl":"10.1016/j.marstruc.2025.103815","url":null,"abstract":"<div><div>Offshore structures face complex and stochastic loads from waves, current, and wind. An accurate long-term analysis is crucial for reliability assessment for overloading and fatigue failures. This problem is challenging due to the small probabilities and numerous uncertainties, thus existing methods mostly rely on simplifications or empirical rules. To address these challenges, this paper presents a new method for long-term extreme response and fatigue analysis, incorporating seven long-term environmental variables following a prescribed joint distribution and short-term uncertainties from irregular waves. The method combines subset simulation (SS) for efficient reliability analysis of rare events and an advanced metamodel GE-NARX for predicting the time series response for a wide range of environmental inputs. A new design-of-experiments scheme is developed to train the metamodel effectively. Another novel aspect is the application of SS to efficiently evaluate not only the failure probabilities but also the mean damage. The proposed method is tested on a floating system and shown to accurately predict the long-term extreme response and cumulative fatigue damage when compared with a time-consuming benchmark method, while offering a substantial computational speedup. The proposed method is highly efficient, allowing the investigation of diverse scenarios for better insight. Among other things, the results reveal the critical role of wave, current and wind directionality, and assuming deterministic values for wave, wind and current parameters can be substantially erroneous, highlighting the limitations of design codes. The proposed method is an effective tool for design and potentially for real-time risk assessment of offshore structures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103815"},"PeriodicalIF":4.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738032","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 prediction model for the global collision behavior of marine risers

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-30 DOI: 10.1016/j.marstruc.2025.103817

Honglu Gu, Yufeng Jiang, Fuheng Li, Xiaomin Li

{"title":"A numerical prediction model for the global collision behavior of marine risers","authors":"Honglu Gu, Yufeng Jiang, Fuheng Li, Xiaomin Li","doi":"10.1016/j.marstruc.2025.103817","DOIUrl":"10.1016/j.marstruc.2025.103817","url":null,"abstract":"<div><div>This study develops a precise and efficient numerical model for predicting the global collision behavior of marine risers. Considering the combined effects of currents, random waves, top motions, and hydrodynamic interference, a dual-riser mechanical model is developed using the vector form intrinsic finite element (VFIFE) method. The point-value modeling method overcomes the limitations of displacement governing equations, eliminating the need for displacement constraint and stiffness matrix modification in the collision region. The issue of collision discontinuity is addressed using path elements. A two-stage collision detection strategy and an adaptive detection interval function, along with a self-developed collision detection algorithm, enhance efficiency without compromising accuracy. Additionally, the collision detection criteria are refined to avoid \"pseudo-collisions.\" Upon detecting a riser collision, a rigid-body collision model is employed between collision path elements to correct riser element \"penetration,\" thereby obtaining the true collision response. The model's accuracy is validated against ABAQUS results and is applied to analyze the global collision response of a tandem top-tensioned riser system. The results show that this model substantially improves calculation efficiency. Riser collisions are nearly line-line contacts and affect the downstream riser more than upstream riser. These collisions impact velocity response more than displacement. Normal collision velocities are much higher than tangential ones.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103817"},"PeriodicalIF":4.0,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738035","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

Understanding wave effects on the hydrodynamic characteristics of knotless nylon netting and flow field analysis around netting

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-24 DOI: 10.1016/j.marstruc.2025.103812

Shaojian Guo , Cheng Zhou , Zhiqiang Liu , Rong Wan , Yucheng Wang , Jiankang Wang , Xi Zhang , Zimu Xu

{"title":"Understanding wave effects on the hydrodynamic characteristics of knotless nylon netting and flow field analysis around netting","authors":"Shaojian Guo , Cheng Zhou , Zhiqiang Liu , Rong Wan , Yucheng Wang , Jiankang Wang , Xi Zhang , Zimu Xu","doi":"10.1016/j.marstruc.2025.103812","DOIUrl":"10.1016/j.marstruc.2025.103812","url":null,"abstract":"<div><div>Knotless nylon (PA) netting has been extensively employed in aquaculture cages, fishing gears and trash-blocking nettings, with its hydrodynamic characteristics playing a vital role in both operational efficiency and structural performance. This study investigated the hydrodynamic characteristics of knotless nylon (PA) netting under different wave cases through a series of flume experiments. Particle Image Velocimetry (PIV) technology was employed to analyze the flow field around the netting, further elucidating the mechanisms behind its hydrodynamic performance. The results show that: (1) wave period, wave height, and solidity ratio are positively correlated with the horizontal wave force on the nettings. Inertial forces cannot be neglected and increases with the increase in period and amplitude; (2) the drag coefficients for the four nettings range from 1.169 to 2.625, while the inertial coefficients range from 1.642 to 23.845. The drag coefficient decreases with increasing <em>Re</em> and <em>KC</em>, whereas the inertial coefficient shows no consistent variation trend; (3) PIV-measured velocities have an average absolute error of 4.855 % compared to theoretical values. The velocity exhibits a cosine-like trend, consistent with the variation pattern of horizontal wave forces; (4) higher wave heights and periods increase water particle velocities and the amplitude of velocity variations across phases. This study serves as a foundational reference for optimal design of efficient aquaculture cages and trash-blocking nettings, fostering enhanced the performance of marine structures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103812"},"PeriodicalIF":4.0,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686010","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

Investigation and formulation of LJF in collar-reinforced K-joints under OPB in jacket substructures of offshore wind turbines

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-22 DOI: 10.1016/j.marstruc.2025.103810

Hossein Nassiraei (Associate Professor) , Hamid Reza Chavoshi (Master Student) , Pooya Rezadoost (PhD Candidate)

{"title":"Investigation and formulation of LJF in collar-reinforced K-joints under OPB in jacket substructures of offshore wind turbines","authors":"Hossein Nassiraei (Associate Professor) , Hamid Reza Chavoshi (Master Student) , Pooya Rezadoost (PhD Candidate)","doi":"10.1016/j.marstruc.2025.103810","DOIUrl":"10.1016/j.marstruc.2025.103810","url":null,"abstract":"<div><div>This study examines the local joint flexibility of collar-reinforced K-shaped tubular connections subjected to balanced and unbalanced out-of-plane bending moments. The accuracy of numerical models was first validated by comparing them with available experimental and numerical data. Following this, 274 finite element analyses were performed on 134 connections to investigate the influence of geometric parameters on the flexibility coefficient and the ratio of the flexibility coefficient in reinforced to associated unreinforced connections. The findings revealed that reinforcing K-shaped connections with collar plates significantly reduced the flexibility coefficient, with reductions reaching up to 90.41%, primarily due to the increased radial stiffness of the chord. Additionally, the results showed that longer and thicker collar plates led to a substantial decrease in the flexibility coefficient. Also, the effect of collar thickness becoming more pronounced as collar length increased, highlighting their combined contribution to improving connection stiffness. Moreover, the increase of <em>β</em> and decrease of <em>γ</em> result in the drop of the Local Joint Flexibility coefficient. Finally, two parametric formulas for calculating the flexibility coefficient in reinforced connections were proposed, demonstrating robustness and reliability, and providing consistency with industry standards across a range of connection configurations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103810"},"PeriodicalIF":4.0,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686007","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

Nonlinear thermal responses of the cracked pipeline rehabilitated by the FGP-GPLs liner with an oval-shaped cross-section

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-22 DOI: 10.1016/j.marstruc.2025.103811

Qian Zhang , Shiyi Zhang , Meiling Shen , Zhaochao Li

{"title":"Nonlinear thermal responses of the cracked pipeline rehabilitated by the FGP-GPLs liner with an oval-shaped cross-section","authors":"Qian Zhang , Shiyi Zhang , Meiling Shen , Zhaochao Li","doi":"10.1016/j.marstruc.2025.103811","DOIUrl":"10.1016/j.marstruc.2025.103811","url":null,"abstract":"<div><div>Subsea pipelines are subjected to damage following extended operational periods. A cost-efficient and effective trenchless remediation approach is to install flexible thin-walled liners for continued operation. However, oval-shaped imperfections may happen in the liner because of problems including under-dilatation, distortion of the original pipeline, and faulty joint alignment in engineering applications. This investigation reveals stability characteristics for the encased functionally graded porous (FGP) liner with an oval-shaped cross-section consolidated by graphene platelets (GPLs) within a heating field. The Halpin-Tsai micromechanics approach and Gaussian random field are utilized to characterize the distributed pattern of the porosity and GPLs within the cross-sectional view of the liner. Geometric nonlinearity is considered. A formula for displacement is presented to outline the radial deflection in the FGP-GPLs oval liner. Utilizing the thin-walled shell principle and energy criterion, the temperature-displacement equilibrium path is predicted, and the minimum/critical temperature variation is deduced. Thereafter, comparative examinations are carried out with the results of other investigations. Good accordance indicates the present study is efficient and accurate. Finally, a parameter assessment is accomplished by looking into the impacts of pores, the weight fraction of the GPLs, and ovality on the anti-buckling responses. The conclusion shows that both minimum temperature variation and critical temperature variation decrease by 24.7 % as the ovality increases from 0 % to 10 %.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103811"},"PeriodicalIF":4.0,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686008","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

Investigation on the cyclic laterally-loaded response of pile-bucket foundation with grouted connection

IF 4 2区工程技术

Marine Structures Pub Date : 2025-03-22 DOI: 10.1016/j.marstruc.2025.103808

Lichen Li , Ningxiao Yan , Zhuo Liu , Wenbing Wu , Guosheng Jiang , Libo Chen , Hao Liu

{"title":"Investigation on the cyclic laterally-loaded response of pile-bucket foundation with grouted connection","authors":"Lichen Li , Ningxiao Yan , Zhuo Liu , Wenbing Wu , Guosheng Jiang , Libo Chen , Hao Liu","doi":"10.1016/j.marstruc.2025.103808","DOIUrl":"10.1016/j.marstruc.2025.103808","url":null,"abstract":"<div><div>As a newly emerged solution for supporting the new generation of offshore wind turbines (OWTs), the pile-bucket foundation has received wide attention. However, little attention has been paid to the grouted connection that connects the monopile and bucket foundation. As the load-transferring, yet vulnerable component, the fatigue mechanism of the grouted connection and its influence on the cyclic laterally-loaded response of OWT foundation are still not clear. In this study, a sophisticated three-dimensional (3D) finite element (FE) model of the pile-bucket foundation with grouted connection is constructed, which incorporates a hypoplastic clay model and the concrete damage plasticity (CDP) to consider the cyclic load effect on both soil and grout material. A modal analysis is first performed to verify the rationality of the proposed model. Then the influence of cyclic load frequency, load amplitude and stiffener arrangement on the accumulation of pile head displacement, stress distribution and crack development of the grouted connection is systematically analyzed. Results indicate that as load frequency approaches the eigen-frequency, the OWT structure tends to vibrate more intensively, leading to stress concentration and fatigue damage of the grouted material and rapid accumulation of the pile-head displacement. The influence of load amplitude on grout damage seems to be limited in the contact area in the simulated cases. Meanwhile, the installation of stiffeners slightly mitigates the pile head displacement accumulation, but also raises the risk of stress concentration and fatigue damage of the grouted connection. The numerical results reveal the load-transferring function and fatigue damage of the grouted connection, which could provide some reference for an optimized structure and dynamic design for the pile-bucket foundation under cyclic load.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103808"},"PeriodicalIF":4.0,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686011","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