Ocean Engineering最新文献

{"title":"Bending behaviour of rigid-flexible combined inflatable membrane structures for floating bridge modules","authors":"Yunling Ye ,&nbsp;Jin Gan ,&nbsp;Huabing Liu ,&nbsp;Weiguo Wu ,&nbsp;Lin Wang ,&nbsp;Junyu Guo ,&nbsp;He Li","doi":"10.1016/j.oceaneng.2025.122005","DOIUrl":"10.1016/j.oceaneng.2025.122005","url":null,"abstract":"<div><div>This paper investigates the load-bearing characteristics of rigid-flexible combined inflatable floating bridge modules. A simplified numerical model incorporating air-membrane coupling is first developed and validated by experimental data. Accordingly, a numerical method is subsequently employed to analyse the structural behaviour of the floating bridge module, including load-deformation feature, failure modes, and the effects of key structural parameters on the structural behaviour. The results reveal an initial linear load-deformation followed by softening, leading to local buckling failures. The parametric study indicates that an increased deck plate thickness, deck height, and internal pressure effectively enhance the load-bearing capacity of the floating bridge module. An equivalent stiffness prediction model is constructed with a prediction error of 0.594 % against numerical results. Overall, this study advances the understanding of load-bearing characteristics for inflated rigid-flexible combined floating bridge modules.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122005"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513666","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":"Numerical modeling of multi-directional lateral behaviour of pile foundations for offshore wind turbines in clay","authors":"Shasha Ren ,&nbsp;Deqiong Kong ,&nbsp;Yueming Du ,&nbsp;Yuan Chen ,&nbsp;Bin Zhu","doi":"10.1016/j.oceaneng.2025.121817","DOIUrl":"10.1016/j.oceaneng.2025.121817","url":null,"abstract":"<div><div>This study investigates the lateral behavior of pile foundations for offshore wind turbines (OWT) under various loading paths in clay, including arc-shaped and cross-shaped trajectories, as well as the impact of occasional deviated loads on displacement accumulation. A finite element model that incorporates soil softening behaviour is established and validated against centrifuge tests conducted by the authors as well as reported in the literature. Following that a parametric study is conducted to explore the complex pile-soil interactions and examine how multi-directional loading influences the behavior of pile foundations. The results show that multi-directional loading significantly enhances pile displacement accumulation, with non-coaxial behavior observed as a mismatch between peak load and peak displacement. It is for the first time revealed that the most undesirable deviated loading angle ranges between 45° and 60°, and even one occasional event of deviated load can substantially impact cumulative displacement. The study further emphasizes the need to introduce a multi-directional loading factor to the design of OWT pile foundations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121817"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513671","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 prognostic driven dynamic predictive maintenance decision-making model for offshore wind turbine systems","authors":"Yi Qin ,&nbsp;Hangjun Yu ,&nbsp;Dingliang Chen ,&nbsp;Yongfang Mao","doi":"10.1016/j.oceaneng.2025.122041","DOIUrl":"10.1016/j.oceaneng.2025.122041","url":null,"abstract":"<div><div>The existing researches on predictive maintenance for offshore wind turbine systems primarily focus on optimizing maintenance costs over a long term, lacking a more detailed assessment of the balance between utilizing the remaining useful life value of degraded components and optimizing maintenance costs. Moreover, the current methods on spare parts management and maintenance scheduling for wind turbines have poor dynamic response characteristics and cannot effectively utilize the prognostic information. To achieve the optimized health management of wind turbine systems, this paper explores a prognostic driven dynamic predictive maintenance decision-making method. Considering two typical health management activities of wind turbine systems, an individual maintenance decision-making model and multi-component maintenance decision-making model are constructed, where two new expected net operation and maintenance cost functions are defined. Based on these two models and the dynamical prognostic information, a system-level dynamic maintenance decision-making model is established to obtain the optimized maintenance schedule of wind turbine systems. Finally, the effectiveness and superiority of the proposed method are validated through an actual offshore wind turbine dataset and several simulation cases.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122041"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513672","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 and numerical investigation on springing and whipping responses of a 21000TEU containership","authors":"Xing Chang ,&nbsp;Zhenwei Chen ,&nbsp;Jialong Jiao ,&nbsp;Bowen Ma","doi":"10.1016/j.oceaneng.2025.121979","DOIUrl":"10.1016/j.oceaneng.2025.121979","url":null,"abstract":"<div><div>In this study, the nonlinear hydroelastic behaviour in terms of ship motion and load responses of an ultra-large 21000 TEU containership in head regular waves are investigated experimentally by a segmented model equipped with a U-shaped backbone. In addition, numerical simulations by using CFD-FEM coupled method are also carried out to reproduce the hydroelastic responses for a comparative study. The ship hydroelasticity in head regular waves under various conditions of wave length, wave height and speed are comprehensively studied. Attention is mainly focused on the responses of springing and whipping phenomena. The springing responses under different orders of resonance frequency are systematically analyzed. The results indicates that for the ultra-large containership with relatively small bow flare area but large fat parallel middle body, the whipping loads contributes no much to the total loads even in high wave states. However, the springing loads can be several times large of the wave-frequency loads even in low and middle wave state, which makes the total loads to be very large and almost in a same magnitude as the whipping loads in severe waves.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121979"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513960","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":"Digital twin-enabled structural real-time monitoring for blended-wing-body underwater gliders","authors":"Huachao Dong ,&nbsp;Jiale Li ,&nbsp;Jinglu Li ,&nbsp;Wenyi Long ,&nbsp;Junchang Liu","doi":"10.1016/j.oceaneng.2025.121980","DOIUrl":"10.1016/j.oceaneng.2025.121980","url":null,"abstract":"<div><div>As innovative marine systems, Blended-wing-body underwater gliders (BWBUGs) have become crucial components in maritime operations. However, during autonomous missions beyond shore-based support infrastructure, BWBUGs face significant challenges from complex marine environmental conditions. Thus, real-time structural monitoring and prediction become essential for ensuring operational stability. To address these requirements, this study develops a digital twin-enabled framework for BWBUG structural monitoring, integrating three key components: data generation and collection, sensor layout optimization, rapid prediction and visualization. Specifically, the framework implementation initiates with baseline dataset generation employing numerical simulations and experiments, with numerical models calibrated iteratively against experimental measurements. Subsequently, the Kriging-assisted discrete global optimization (KDGO) algorithm is employed for optimal strain sensor placement. The final phase implements a predictive model between sparse sensor inputs and full-field strain data, combining isometric mapping (Isomap) dimensionality reduction with radial basis function (RBF) surrogate modeling. Concurrent virtual visualization techniques are implemented for analysis of structural responses. Experimental validation confirms the framework's effectiveness in BWBUG structural real-time monitoring, and its data-driven architecture enables adaptation to other marine equipment requiring real-time monitoring.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121980"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513668","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 coupled FEM-GDQM approach for vibration analysis of stiffened and laminated composite plates","authors":"Aytac Arikoglu ,&nbsp;Mert Serveren ,&nbsp;Ozgur Demir","doi":"10.1016/j.oceaneng.2025.121997","DOIUrl":"10.1016/j.oceaneng.2025.121997","url":null,"abstract":"<div><div>This paper studies free vibration of stiffened and laminated composite plates by a combined finite element method (FEM) and generalized differential quadrature method (GDQM) approach. Stiffener and plate equations are obtained by the Hamilton's principle and they are combined by the use of Dirac-delta function. A novel approach for the solution of such PDEs by the GDQM is proposed. The stiffener model is formulated in its most general form i.e., it carries out axial, bending, lateral bending and torsion deformations. Torsional rigidity of composite stiffeners is calculated by a novel numerical torsion experiment conducted via an in-house FEM code. The results of the proposed framework are validated against the ones found in the literature and commercial FEM software and a very good agreement is observed.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 121997"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518755","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":"Numerical study of flow-sound correlation mechanism and sound source distribution for NACA0012 hydrofoil","authors":"Lianjie Yu ,&nbsp;Decheng Wan ,&nbsp;Qi Shen ,&nbsp;Yan Gao ,&nbsp;Jiaao Geng ,&nbsp;Shang Shi","doi":"10.1016/j.oceaneng.2025.122039","DOIUrl":"10.1016/j.oceaneng.2025.122039","url":null,"abstract":"<div><div>Hydrofoil is a simplified model of the propeller. Its lifting surface is also widely used in the submarine sail, rudder and other structures. Focus on hydrofoil sound source distribution and flow-sound correlation mechanism, NACA0012 hydrofoil is selected as the research object. Large eddy simulation (LES) and acoustic analogy is used to study the flow and sound characteristics. Dual-mesh technology is applied for accelerating the computation. The numerical results are validated by experiments. It is found that the computational efficiency is improved by more than 30 times with no loss of accuracy using dual-mesh technique. Cross spectrum, third-generation vortex identification technique and DMD are used to analyze the mechanism of wall pressure fluctuation and vortex structure on the radiated noise. By calculating the cross-spectral correlation coefficients, it is found that the correlation is stronger at the <em>n</em>th order peak frequency. Both of dipole and wall pressure have extreme values in the suction and lifting direction. With dynamic mode decomposition (DMD), it is found that the vortices are similar to the dominant mode of the Lighthill source. The peak frequency of quadrupole corresponds to the high-energy mode of the vortex shedding.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122039"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513669","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":"Cooperative game method of heterogeneous unmanned surface vehicles based on distributed decision-making framework","authors":"Cong Chen ,&nbsp;Xiao Liang ,&nbsp;Zhao Zhang ,&nbsp;Dianyong Liu ,&nbsp;Changdong Yu ,&nbsp;Wei Li","doi":"10.1016/j.oceaneng.2025.122048","DOIUrl":"10.1016/j.oceaneng.2025.122048","url":null,"abstract":"<div><div>Due to targeted design, unmanned surface vehicles (USVs) with different functions often show significant heterogeneous characteristics. This heterogeneity allows the USV cluster to perform more complex and diverse tasks. This paper innovatively proposes a cooperative game method for a heterogeneous USV cluster based on a distributed decision-making framework, which aims to significantly improve its decision-making quality. Specifically, we first combine the underactuated characteristics of the USV and the actual mission requirements and use the geometric method to accurately calculate the position of the guidance point. On this basis, we introduce the concept of ’neighbor USV’, and construct a distributed decision-making framework based on neighbor USV. The framework further enhances the coordination ability between USVs through a hierarchical decision-making mechanism. In the hierarchical decision-making system, the upper decision-making is mainly responsible for solving the sub-task allocation problem of each USV. The lower decision-making focuses on the specific action strategy of each USV. In order to verify the feasibility and superiority of the proposed method, we carried out Monte Carlo simulation experiments. The experimental results show that this method significantly improves the coordination efficiency and task execution ability of the USV cluster while ensuring real-time decision-making. Through the research of this paper, we provide a new idea for the cooperative control of heterogeneous USV clusters and provide a reference for the broad application of USV clusters in the future complex task environment.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122048"},"PeriodicalIF":4.6,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513673","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":"Vortex-induced vibrations of stepped cylinders with varied spanwise arrangements and diameter ratios","authors":"Muyuan Du,&nbsp;Zhimeng Zhang,&nbsp;Jiahang Lv,&nbsp;Chunning Ji","doi":"10.1016/j.oceaneng.2025.122068","DOIUrl":"10.1016/j.oceaneng.2025.122068","url":null,"abstract":"<div><div>Vortex-induced vibration (VIV) presents a significant challenge in the design of offshore risers and pipeline systems. Compared to bare uniform risers, the attachment of large-diameter buoyancy modules significantly modifies hydrodynamic characteristics and, consequently affects the fatigue damage of the risers. To improve the understanding and optimization of system VIV, this study experimentally investigates the hydrodynamics and response mechanisms of stepped cylinders under both concentrated and staggered buoyancy module configurations with different diameter ratios (<em>D/d</em> = 1.25, 1.5, 2, <em>D</em>: buoyancy module/large cylinder diameter; <em>d</em>: bare pipe segment/small cylinder diameter) in uniform flow. The results show that stepped cylinder in concentrated configurations exhibits a distinct \"dual lock-in\" phenomenon, where the frequency in the second lock-in region is notably higher than in the first region. At small and intermediate diameter ratios (<em>D/d</em> = 1.25 and 1.5), the distinct vibration response branches are respectively dominated by the small and large cylinder segments. However, for increasing to the large diameter ratio condition (<em>D/d</em> = 2), the dominance of the large cylinder segment becomes more pronounced. For staggered configurations, the dynamic behavior diverges with diameter ratios: systems with <em>D/d</em> = 1.25, 1.5 exhibit single lock-in characteristics resembling low-mass-damping uniform cylinders, whereas a dual lock-in response emerges at <em>D/d</em> = 2. During the transition between two lock-in regions, the stepped cylinder exhibits shift in vibration frequency and wake pattern, causing a phase jump between the lift force and structural response; this discontinuity alters the effective added mass coefficient, leading to dual lock-in. The mechanism governing VIV responses lies in the dynamic competition between large and small cylinder segments. This competition intensifies wake interactions and amplifies nonlinearity in both hydrodynamic forces and structural vibrations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122068"},"PeriodicalIF":4.6,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510699","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":"Seismic performance of aged jacket platforms subjected to onshore and offshore earthquakes","authors":"Sining Huang ,&nbsp;Qihang Sun ,&nbsp;Wen Bai ,&nbsp;Xun Guo ,&nbsp;Junwu Dai ,&nbsp;Chuan Ma","doi":"10.1016/j.oceaneng.2025.122021","DOIUrl":"10.1016/j.oceaneng.2025.122021","url":null,"abstract":"<div><div>The aging effect represents a critical factor in seismic research for jacket platforms. This study investigated the seismic performance of aged jacket platforms with consideration of the soil-pile-structure interaction (SPSI). Shaking table tests with a 1/20 scaled model that incorporates the corrosion effects of jacket platforms with service lives of 0, 20, and 30 years were conducted to compare the dynamic characteristics and structural responses of these models under onshore and offshore earthquake excitations. To complement the experimental study, three corresponding finite element (FE) models considering SPSI effects were developed to enable detailed seismic fragility analyses for aged jacket platforms. The results suggest that jacket platforms exhibit significantly higher collapse transcendence probability under offshore earthquake, with 2–3 times larger responses than those under onshore events. Furthermore, after 20 years of service life, the collapse transcendence probability of these platforms increases substantially—by about 20 %–40 % compared to jacket platforms with 0 years of service life—primarily due to extensive corrosion. The experimental and numerical results obtained through this study serve as a valuable basis for risk assessment and seismic design of aged offshore jacket platforms.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122021"},"PeriodicalIF":4.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510697","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}