Ocean Engineering最新文献_第10页

Characterization and predictive modeling of directional piling lateral offsets for offshore conductors

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-21 DOI: 10.1016/j.oceaneng.2025.121008

Jiakang Wang, Jin Yang, Qishuai Yin, Zhan Yang, Guojing Zhu, Wenbo Gong, Zhifu Chen

{"title":"Characterization and predictive modeling of directional piling lateral offsets for offshore conductors","authors":"Jiakang Wang, Jin Yang, Qishuai Yin, Zhan Yang, Guojing Zhu, Wenbo Gong, Zhifu Chen","doi":"10.1016/j.oceaneng.2025.121008","DOIUrl":"10.1016/j.oceaneng.2025.121008","url":null,"abstract":"<div><div>Directional piling refers to a construction method in which the conductor shoe is pre-chamfered to facilitate directional deviation during the piling process. It effectively avoids inter-well collisions during operations. An experimental setup was designed to clarify the offset mechanism of offshore conductors. Directional piling for conductors was tested on a small scale. The study investigated the effects of shoe angle, penetration depth, conductor size, and soil properties on the offset characteristics during directional piling. The results showed that all these parameters have a strong correlation with the conductor's offsets. Numerical simulations were additionally conducted based on the experiments. A robust dataset was constructed by combining experimental results and numerical simulation data. Following feature extraction and parameter preprocessing, a directional piling offset prediction model for offshore conductors was developed using the multilayer perceptron (MLP) regression model. A 97 % fitting rate was attained by the prediction model. The model was applied to a well group in the South China Sea. The prediction model's accuracy was validated when the lateral offset calculation error was kept within ±0.2m of the measured data. The research findings will provide higher precision and efficiency for offshore well construction operations, offering a solid theoretical foundation for conductor anti-collision strategies.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 121008"},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685662","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

Penetration of a modified suction caisson in sand considering seepage effect

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-21 DOI: 10.1016/j.oceaneng.2025.120997

Jipeng Zhao , Yongan Ma , Dayong Li

{"title":"Penetration of a modified suction caisson in sand considering seepage effect","authors":"Jipeng Zhao , Yongan Ma , Dayong Li","doi":"10.1016/j.oceaneng.2025.120997","DOIUrl":"10.1016/j.oceaneng.2025.120997","url":null,"abstract":"<div><div>The modified suction caisson (MSC) adds an external skirt surrounding the top of traditional suction caisson (also called internal caisson here) to increase bearing capacity and to limit its deflection, which can be used in offshore engineering. The seepage effect will change the effective stress of soil around the caisson sidewall during penetration in sand. Meanwhile, piping will occur when the required suction exceeds the critical suction, leading to penetration failure. Therefore. The reliable method to predict the required suction for MSC penetration is necessary by considering the seepage effect. This study explores the influence of length/diameter ratio (<em>L</em>/<em>D</em>) on seepage fields by finite element analyses. The variation of excess porewater pressures (EPPs) and hydraulic gradients (HGs) around the caisson sidewall are revealed. Moreover, the probability of a risk of piping and sand flow decreases as <em>L</em>/<em>D</em> increases under the same suction. Finally, the seepage fields are analyzed when the suction is generated within the internal caisson. The method of calculating the MSC penetration resistance considering the seepage effect is formulated in terms of the principle of static equilibrium. In addition, a new method for estimating the required suction is proposed and validated by model tests.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120997"},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685773","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

Operational modal analysis applied to floating offshore wind turbine dynamics identification in wave basins in the presence of free-surface modes

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-21 DOI: 10.1016/j.oceaneng.2025.120909

Josean Galván , José M. Domínguez , Joseba Albizuri

{"title":"Operational modal analysis applied to floating offshore wind turbine dynamics identification in wave basins in the presence of free-surface modes","authors":"Josean Galván , José M. Domínguez , Joseba Albizuri","doi":"10.1016/j.oceaneng.2025.120909","DOIUrl":"10.1016/j.oceaneng.2025.120909","url":null,"abstract":"<div><div>This paper presents the modal characteristics of a 10 MW floating offshore wind turbine (FOWT) model, scaled to full size. We utilise both traditional and advanced algorithms, including logarithmic decrement, stochastic subspace identification covariance and data-driven methods, to analyse the system's operational behaviour under free decay and irregular wave conditions. This study explores the full damping matrix and the influence of coupled degrees of freedom. Under irregular wave conditions, a 30% deviation in the surge resonance frequency is identified, which is linked to the wave period's near-heave resonance and a fluid free-surface mode of the fluid inside the wave tank. The use of stability diagrams facilitates the identification of these modes from the FOWT's response. Furthermore, this paper examines the evolution of damping and operational deflection shapes across different sea states. The models synthesised from modal estimations of wave tests are validated using autocorrelation functions, which confirm that the employed methods effectively captured the FOWT's rigid-body dynamics, even in extreme conditions where the FOWT and fluid act as a coupled system. The study emphasises that free-surface modes have the potential to introduce additional energy, which could be a significant contributor to the underestimation of low-frequency responses in numerical hydrodynamic models.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120909"},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685829","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 new approach to improving the accuracy of seakeeping predictions using strip theory for high-speed vessels

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-21 DOI: 10.1016/j.oceaneng.2025.120995

Thai Gia Tran , Viet Trung Doan , Hung Tran

{"title":"A new approach to improving the accuracy of seakeeping predictions using strip theory for high-speed vessels","authors":"Thai Gia Tran , Viet Trung Doan , Hung Tran","doi":"10.1016/j.oceaneng.2025.120995","DOIUrl":"10.1016/j.oceaneng.2025.120995","url":null,"abstract":"<div><div>Seakeeping is one of the most essential performances, so accurately predicting this performance during ship design is an important problem, but it is usually ignored due to its complex nature. In current methods, strip theory is often used to solve this problem due to its unique advantages of fast computation and ability to incorporate into the early stages of the ship design process. However, this method provides low accuracy for high-speed vessels due to the incompatibility of the motions of this type of vessel with the linear and small amplitude assumptions of strip theory. This paper presents an approach with algorithms and the frequency and time domain solution to improve the accuracy in the seakeeping prediction of high-speed vessels using strip theory. The results of applying this study to the Vietnamese displacement high-speed vessel named K88 showed that the deviations between theoretical computations and model test data were up 20 % with the classical strip theory by Salvesen et al., 1970), and were greatly reduced to within ±4.5 % in all computation cases after applying our proposed approach with a suitable correction factor.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120995"},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685663","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

Experimental study of plug formation in open-ended pipe piles using image analysis

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.120912

Daniel G. Fridman, Monica Prezzi, Rodrigo Salgado

{"title":"Experimental study of plug formation in open-ended pipe piles using image analysis","authors":"Daniel G. Fridman, Monica Prezzi, Rodrigo Salgado","doi":"10.1016/j.oceaneng.2025.120912","DOIUrl":"10.1016/j.oceaneng.2025.120912","url":null,"abstract":"<div><div>The capacity of an open-ended pipe pile (OEPP) is directly influenced by the soil plug that forms inside its shaft during installation. To investigate plug formation and its impact on pile capacity, eight model OEPP tests were performed in a calibration chamber with image analysis capabilities. The model piles were jacked into sand samples of different relative densities. After installation, compressive static load tests were performed. Using digital image correlation, we analyzed the displacement and strain fields in the sand domain surrounding the pile and inside its plug, for different test conditions and plugging conditions, to study the plug formation process and propose an idealized plugging mechanism. During the installation of a fully coring OEPP, most of the soil deformation is located under the pile annulus. As the OEPP plugs, the deformation progresses towards the axis of the pile in a region below its base. Plugged piles behave much like closed-ended piles, with a zone of intense shearing below the entire pile base. The different deformation patterns around OEPPs for different degrees of plugging influence their responses to axial loading, making it important to account for the history of plugging during installation when designing OEPPs and estimating their axial capacities.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120912"},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685741","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

Enhancing piled raft foundation performance in clay: Exploring the influence of cyclic lateral loading patterns, frequency, and cycles

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.120977

Sommart Swasdi , Tanan Chub-Uppakarn , Watchara Srisakul , Pattamad Panedpojaman , Worathep Sae-Long

{"title":"Enhancing piled raft foundation performance in clay: Exploring the influence of cyclic lateral loading patterns, frequency, and cycles","authors":"Sommart Swasdi , Tanan Chub-Uppakarn , Watchara Srisakul , Pattamad Panedpojaman , Worathep Sae-Long","doi":"10.1016/j.oceaneng.2025.120977","DOIUrl":"10.1016/j.oceaneng.2025.120977","url":null,"abstract":"<div><div>Piled raft foundations are increasingly used in construction due to their cost efficiency, requiring fewer piles than traditional pile foundations. Their ability to withstand cyclic lateral loads, such as those from earthquakes and wind forces, is crucial for structural stability. Understanding their response under cyclic loading conditions is essential, and finite element modeling (FEM) is a valuable tool for analyzing these behaviors. A recent 3D FEM study examined the performance of piled raft foundations in clay soils, focusing on loading pattern, frequency, and number of cycles. Results showed that lateral load capacity decreased as cycle count and frequency increased, with full cyclic loading (FCL) having a more pronounced effect than half cyclic loading (HCL). The raft shared 20.57–39.07 % (HCL) and 27.68–55.13 % (FCL) of lateral loads at frequencies of 0.1–10 Hz over 20 cycles. Additionally, locked-in moments increased by 21 %, and the degradation factor ranged from 65 to 80 % for HCL and 70–90 % for FCL. These findings provide valuable insights into pile-soil interaction and foundation stability under cyclic lateral loading, ensuring more effective design strategies for structures exposed to dynamic forces. Future research should explore long-term cyclic effects to further optimize foundation performance.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120977"},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685737","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

Experimental analysis and proposal of semi-empirical prediction model on tidal stream turbine induced local scour subjected to wave-current loading

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.121020

Xu Deng , Xiangfeng Lin , Jisheng Zhang , Siyuan Liu , Hao Chen , Shibo Zhang , Yiwei Qiu , Zihan Ding

{"title":"Experimental analysis and proposal of semi-empirical prediction model on tidal stream turbine induced local scour subjected to wave-current loading","authors":"Xu Deng , Xiangfeng Lin , Jisheng Zhang , Siyuan Liu , Hao Chen , Shibo Zhang , Yiwei Qiu , Zihan Ding","doi":"10.1016/j.oceaneng.2025.121020","DOIUrl":"10.1016/j.oceaneng.2025.121020","url":null,"abstract":"<div><div>Accurately predicting tidal stream turbine induced morphological evolution is crucial for layout and maintenance of turbine devices. However, the tidal stream turbine induced scour morphology under wave-current loading and corresponding prediction method remain relatively unexplored. Therefore, experimental tests were conducted in the wave-current flume to observe and analyze the mono-pile supported horizontal-axis tidal stream turbine (HATST) induced local scour subjected to wave-current loading. A semi-empirical model was proposed to predict the induced equilibrium scour depth. In this model, the Actuator Disc Theory and wave-current-scour correlations were introduced into Phenomenological Theory of Turbulence. Results indicate that the rotating rotor intensifies the scour around supporting mono-pile under wave-current loading. When waves superposed on current, the equilibrium scour time around HATST was shortened. The higher wave height, larger flow intensity, and longer wave period result in more intense scour around the HATST. The local scour is initially enhanced and then weakened with increasing water depth. The equilibrium scour depth around HATST foundation positively correlates with Keulegan-Carpenter (<em>KC</em>) number and relative wave-current velocity (<em>U</em><sub><em>cw</em></sub>). The derived semi-empirical model can appropriately predict the wave-current induced equilibrium scour depth around the HATST pile foundation when 0.699 ≤ <em>KC</em> ≤ 7.402 and 0.717 ≤ <em>U</em><sub><em>cw</em></sub> ≤ 0.932.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 121020"},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685745","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

Safety-aware isoline tracking control for unmanned surface vehicle

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.120910

Yuzhou Song , Bing Huang , Cheng Zhu , Bo Cheng

引用次数: 0

Hydrodynamic performance of an OWC wave energy converter combined with a perforated wall

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.120955

Chun-Han Ko, Ching-Piao Tsai

{"title":"Hydrodynamic performance of an OWC wave energy converter combined with a perforated wall","authors":"Chun-Han Ko, Ching-Piao Tsai","doi":"10.1016/j.oceaneng.2025.120955","DOIUrl":"10.1016/j.oceaneng.2025.120955","url":null,"abstract":"<div><div>This paper investigates the hydrodynamic performance of a novel Oscillating Water Column (OWC) device, which featuring a perforated wall positioned in front of the OWC chamber. Designed to be integrated into a caisson breakwater, this device aims to harness green energy from ocean waves while strengthening harbor infrastructure. A three-dimensional numerical simulation, utilizing the Reynolds-averaged Navier-Stokes equations, was conducted to explore the flow characteristics and hydrodynamic performance of the OWC. The numerical simulations were validated using data from the literature and current experimental measurements. This study examines the impacts of the underwater opening height of the OWC chamber wall and the novel front perforated wall on flow characteristics and hydrodynamic performance using prototype-scale simulations. The simulation results indicate that the current OWC device achieves optimal hydrodynamic efficiency at a relative water depth <em>kh</em> = 1.58 with a relative underwater opening height <em>h</em><sub><em>b</em></sub>/<em>h</em> = 0.6 and a porosity of the front perforated wall <em>λ</em><sub><em>s</em></sub> = 0.5. A comparative analysis of the hydrodynamic performance of the novel OWC device against U-OWC and conventional OWC devices was also conducted using local site conditions. The findings demonstrate that the current OWC device exhibits a notable improvement in hydrodynamic efficiency.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"327 ","pages":"Article 120955"},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685742","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

Numerical investigation of sloshing flow interaction with porous baffles in a 2D rectangular tank

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-20 DOI: 10.1016/j.oceaneng.2025.120904

Yu-Jin Dong , Sen Wang , Guo-Hai Dong

引用次数: 0