Marine Structures最新文献_第2页

Study on the wrinkling of liner with elliptical defects in lined pipes under axial compression 轴压作用下衬管椭圆缺陷衬管起皱研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-14 DOI: 10.1016/j.marstruc.2025.103822

Zhan-Feng Chen , Yi-Fan Liang , Lin Yuan , Yi Shuai , Wen Wang

引用次数: 0

A structural safety evaluation approach of offshore wind turbine based on projection pursuit method and extension cloud model 基于投影追寻法和扩展云模型的海上风力涡轮机结构安全评估方法

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-13 DOI: 10.1016/j.marstruc.2025.103828

Xiaofeng Dong , Yemeng Jia , Junni Jiang , Honghao Peng , Wenqian Li

{"title":"A structural safety evaluation approach of offshore wind turbine based on projection pursuit method and extension cloud model","authors":"Xiaofeng Dong , Yemeng Jia , Junni Jiang , Honghao Peng , Wenqian Li","doi":"10.1016/j.marstruc.2025.103828","DOIUrl":"10.1016/j.marstruc.2025.103828","url":null,"abstract":"<div><div>The offshore wind power (OWP) industry is developing towards deep sea areas, and thus the offshore wind turbine (OWT) will face more severe environmental conditions and excitations such as storms, typhoons and huge waves. The safety evaluation and early warning of OWT structures has become the key issue to ensure the stable operation of offshore wind farm (OWF) and the sustainable development of the OWP industry. In this research, one structural safety evaluation approach of OWT was proposed based on projection pursuit (PP) method and extension cloud model (ECM), and the evaluation results were discussed by considering two actual OWTs as the research objects. Firstly, the multivariate evaluation index system was established based on the safe threshold of different indexes calculated from numerical models of two OWT in the perspectives of time and frequency domain. Secondly, an index weight optimization method was proposed based on PP and particle swarm optimization (PSO) algorithm to accurately determine the importance of each indicator for safety evaluation. The ECM, which can leverage the advantages of normal cloud theory and extension model, was also utilized to establish a multi-level and multi-index safety evaluation method for OWT. The feasibility of the novel approach was further verified through the both randomly generated samples and typical measured data. Especially, one set of measured data, which shows the occurrence of excessive vibration for OWT, can be evaluated as a sub-healthy status. This result can effectively demonstrate the engineering applicability of the proposed method. Lastly, the influence of wind speed, rotation speed and power on the health status of OWT and its change rule was discussed considering the long-term monitoring data for one year. It is expected that the proposed approach can provide necessary assistance for the safe operation and intelligent maintenance of OWFs.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103828"},"PeriodicalIF":4.0,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823947","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 response modeling of sea-crossing bridge pier under the combined action of earthquakes and ocean waves using high-order time-domain boundary element method 地震与海浪共同作用下跨海大桥桥墩动力响应的高阶时域边界元模拟

IF 4 2区工程技术

Marine Structures Pub Date : 2025-04-11 DOI: 10.1016/j.marstruc.2025.103823

Junzhi Pan , Zilong Ti , Kai Wei , Piguang Wang , Yongle Li

{"title":"Dynamic response modeling of sea-crossing bridge pier under the combined action of earthquakes and ocean waves using high-order time-domain boundary element method","authors":"Junzhi Pan , Zilong Ti , Kai Wei , Piguang Wang , Yongle Li","doi":"10.1016/j.marstruc.2025.103823","DOIUrl":"10.1016/j.marstruc.2025.103823","url":null,"abstract":"<div><div>A high-order time-domain boundary element method (TDBEM) for evaluating the combined impact of earthquakes and waves on sea-crossing bridge piers is presented, facilitating a comprehensive simulation of the interactions among seismic activity, wave forces, and structural responses. The proposed method is validated through numerical simulations from existing studies and benchmark model tests. An elliptical pier is used as a case study to analyze these combined effects. Results indicate that water depth significantly influences structural seismic responses due to changes in fundamental frequencies caused by added water mass. The influence of waves in the combined action is contingent upon the dominant seismic frequencies and the structural fundamental frequencies. When the structural fundamental frequency is far from typical ocean wave frequencies, fluid-structure interaction (FSI) effects amplify the peak response by 8 % to 25 %, depending on the ground motion's dominant frequency. When the structural fundamental frequency coincides with typical ocean wave frequency ranges, FSI effects exhibit an uneven influence on the structural response due to the inhomogeneity of wave-induced FSI effects. In such conditions, as the dominant frequency of ground motions increases, the suppression effect induced by wave FSI on the peak response may counterbalance or exceed the influence of earthquake-induced FSI effects.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815253","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

Influence of wave directional spreading of short-crested irregular waves on ship motions and wave loads 短冠不规则波的波向扩散对船舶运动和波浪载荷的影响

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 多支路拖曳阵列系统动态构型仿真

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 高温气体泄漏下加筋板热响应试验研究

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 G-Twin：基于图形神经网络的数字孪生，用于海上风力涡轮机的实时和高保真结构健康监测

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 海上结构在随机波、流、风荷载作用下的有效长期极端响应和疲劳分析

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 海洋隔水管整体碰撞行为的数值预测模型

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 波浪对无结尼龙网水动力特性的影响及网周围流场分析

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