Marine Structures最新文献

{"title":"An analytical model for dynamic responses of one operating offshore wind turbine structure supported by bucket foundation","authors":"Yuchao Li ,&nbsp;Xiaofeng Dong ,&nbsp;Jijian Lian ,&nbsp;Xu Yang ,&nbsp;Zhuo Miao","doi":"10.1016/j.marstruc.2025.103831","DOIUrl":"10.1016/j.marstruc.2025.103831","url":null,"abstract":"<div><div>Recently, the bucket foundation has gained prominence in offshore wind farm (OWF) due to their superior bearing capacity and lower costs. However, higher towers and larger blades may pose significant vibration safety issues to offshore wind turbine (OWT) structures when OWFs continue developing towards deep-sea areas. It is increasingly crucial to accurately simulate the dynamic response of OWT supported by bucket foundation with the current challenges, including the need to corroborate finite element simulations with actual measurement data and the consideration of bucket-soil interaction and dynamic stiffness. In this research, a analytical model of dynamic responses for one operating OWT supported by bucket foundation was firstly established based on the multi-degree-of-freedom vibration theory. In response to the limitations of existing models, a novel bucket-soil interaction model was introduced considering the dynamic changes in foundation stiffness under external excitation and the influence of soil inside the bucket. The global model simulated wind loads, operational loads, and aerodynamic damping, and the Crayfish Optimization Algorithm (COA) was applied to correction formula of aerodynamic damping based on the measurement data. Furthermore, its accuracy was validated in both shutdown and operating modes by comparing the displacement and acceleration responses at the tower top. Finally, the structural responses were studied under extreme conditions such as earthquakes, wind, waves, and typhoons. It is concluded that the observed response growth trends of the tower-top displacement and acceleration of the established model are consistent with the actual trends observed in the prototype under the operating and shutdown conditions. In operating mode, the average deviations of the displacement and acceleration between the analytical model and the actual OWT structure are 7.18 % and 4.14 %, respectively. The model is suitable for OWT response analysis under seismic intensities below 0.3 g and typhoon of return period of 20 year. It is indicated that the proposed analysis model has good engineering application value for the vibration response simulation of actual OWT.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103831"},"PeriodicalIF":4.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFRP-patch sizing for strengthening perforated steel tubular structures","authors":"Irving D. Hernández ,&nbsp;Murilo A. Vaz ,&nbsp;Julio C.R. Cyrino ,&nbsp;Jorge L. Martinez ,&nbsp;Victor D. Torres ,&nbsp;Gabriel S. Lopes ,&nbsp;Valber A. Perrut ,&nbsp;Gustavo G. de Paula","doi":"10.1016/j.marstruc.2025.103827","DOIUrl":"10.1016/j.marstruc.2025.103827","url":null,"abstract":"<div><div>The use of statistical and non-parameter-based modeling approaches to size a CFRP-patch thickness to restore the intact compressive capacity of perforated steel tubular structures is examined in this paper. Firstly, the effect of the perforation is assessed using non-linear FEM simulations of full-scale tubular structures with multiple levels of slenderness and cutout sizes. Secondly, the contribution of the CFRP-patch to the strengthening of damaged structures is evaluated using a full-factorial design-of-experiment of FEM-models that vary both the ultimate compressive strength and the elastic modulus of the CFRP properties in the longitudinal direction to properly populate a database with the models’ responses. Thirdly, a dataset with thicknesses that restore each damage case's observations to their intact capacity is created. This was accomplished using an ensemble learning method applied to the responses database to estimate the proper CFRP-patch thickness while considering a Hashin's damage criterion level. Finally, a multilinear regression methodology is adopted to describe the dataset, based on the sample and CFRP-patch explanatory variables as well as the Akaike information criterion to fit a model of response surface for the suggested thicknesses. The response predictions from simulated samples with suggested thicknesses are then compared with the ones retrieved from their respective intact models to assess the fitted model's level of effectiveness. Responses from strengthened samples are comparable to those obtained from intact samples, indicating that the fitted model for inferring the CFRP-patch thickness can suggest suitable values of thickness to recover the intact capacity of the samples with ±3 % deviation range.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103827"},"PeriodicalIF":4.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the wrinkling of liner with elliptical defects in lined pipes under axial compression","authors":"Zhan-Feng Chen ,&nbsp;Yi-Fan Liang ,&nbsp;Lin Yuan ,&nbsp;Yi Shuai ,&nbsp;Wen Wang","doi":"10.1016/j.marstruc.2025.103822","DOIUrl":"10.1016/j.marstruc.2025.103822","url":null,"abstract":"<div><div>Transporting corrosive hydrocarbons using the lined pipe is an economical method and has been widely applied in onshore and offshore pipeline systems. However, initial ovality is inevitable in the liner during manufacturing, which can affect the mechanical properties and service life of lined pipes. In this paper, a new lined pipe model considering the initial elliptic defects of the liner is established, and the effect of initial elliptic defects on the liner wrinkling is analyzed by the finite element method. The wrinkling behavior of lined pipes with perfect and elliptic liners under axial compression is studied and compared. Results show that the contact stress on the lined pipe is uneven, and the extent of nonuniformity increases as the ellipticity increases. A large ellipticity can weaken the lined pipe's load-carrying capability. Results also indicate that the liner wrinkling in the lined pipe is sensitive to the initial elliptic defects.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103822"},"PeriodicalIF":4.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A structural safety evaluation approach of offshore wind turbine based on projection pursuit method and extension cloud model","authors":"Xiaofeng Dong ,&nbsp;Yemeng Jia ,&nbsp;Junni Jiang ,&nbsp;Honghao Peng ,&nbsp;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}

{"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 ,&nbsp;Zilong Ti ,&nbsp;Kai Wei ,&nbsp;Piguang Wang ,&nbsp;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}

{"title":"Influence of wave directional spreading of short-crested irregular waves on ship motions and wave loads","authors":"Zhenwei Chen ,&nbsp;Jialong Jiao ,&nbsp;Yuanming Chen ,&nbsp;Caixia Jiang ,&nbsp;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}

{"title":"Dynamic configuration simulation of multi-branches towed array system","authors":"Yi Zhang ,&nbsp;Dapeng Zhang ,&nbsp;Yifan Xie ,&nbsp;Yining Zhang ,&nbsp;Zhengjie Liang ,&nbsp;Keqiang Zhu ,&nbsp;Shutian Zhang","doi":"10.1016/j.marstruc.2025.103819","DOIUrl":"10.1016/j.marstruc.2025.103819","url":null,"abstract":"<div><div>The underwater multi-branch towing cable array is an advanced detection tool widely utilized across various fields, including industry and scientific research. Therefore, studying its operational behavior and nonlinear hydrodynamic characteristics is essential. In this paper, we develop a multi-branch towing cable array model to analyze the primary forces acting on the Control Bird, alongside conducting dynamic analysis for each connected buoy. An effective and reliable method is explored for measuring the formation of the cable array and the fluctuations in tension. This paper proposes and derives a relative current velocity method (RCVM) that improves analysis efficiency. The study evaluates the method's reliability in modeling the normal operation of an underwater multi-branch towing system. Additionally, sensitivity analyses are conducted to examine the system's response to various factors under steady-state and dynamic conditions. The findings offer valuable insights and references for practical engineering applications.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103819"},"PeriodicalIF":4.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on thermal response of stiffened panel under high-temperature gas leakage","authors":"Yuchao Yuan ,&nbsp;Yifei Yang ,&nbsp;Li Guo ,&nbsp;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}

{"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 ,&nbsp;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}

{"title":"Efficient long-term extreme response and fatigue analysis of offshore structures under stochastic wave, current and wind loads","authors":"Qingqing Miao,&nbsp;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}