Ocean Engineering最新文献_第2页

Influence of non-linear wave load models on monopile supported offshore wind turbines for extreme conditions

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120510

Gerard V. Ryan , Tianning Tang , Ross A. McAdam , Thomas A.A. Adcock

引用次数: 0

Experimental study on the hydrodynamic performance of an innovative floating dual-chamber oscillating water column

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-08 DOI: 10.1016/j.oceaneng.2025.120549

K. Rezanejad , G. Anastas , M. Hashemzadeh , J.F.M. Gadelho , I. López , R. Carballo , C. Guedes Soares

{"title":"Experimental study on the hydrodynamic performance of an innovative floating dual-chamber oscillating water column","authors":"K. Rezanejad , G. Anastas , M. Hashemzadeh , J.F.M. Gadelho , I. López , R. Carballo , C. Guedes Soares","doi":"10.1016/j.oceaneng.2025.120549","DOIUrl":"10.1016/j.oceaneng.2025.120549","url":null,"abstract":"<div><div>A comprehensive experimental study investigates the efficiency of a newly devised concept of a Floating dual-chamber Oscillating Water Column Wave Energy Converter device. Built upon the previous design of Rezanejad and Guedes Soares (2021), substantial geometrical improvements have been made to enhance its hydrodynamic performance. The study examines the influence of Power Take-Off damping and wave characteristics on its hydrodynamic performance. The experimental results demonstrate a significant increase in hydrodynamic performance across a wide range of sea states compared to the previously designed floating dual-chamber Oscillating Water Column device. Specifically, the new system exhibits an average hydrodynamic performance of 61% in all sea states, representing a 49% improvement over the efficiency of the previous design. Additionally, the research highlights that the device's fore and rear chambers play a dominant role in absorbing wave energy within specific wave period ranges, with their mutual interactions significantly enhancing the overall hydrodynamic performance. This substantial improvement in efficiency underscores the potential of the newly devised device for wave energy conversion applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120549"},"PeriodicalIF":4.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351151","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

Extreme design wave parameters optimization of typhoon wave for ocean engineering based on numerical simulation and observation data in the South China Sea

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120603

Dong Jiang , Bigui Huang , Qingsheng Miao , Hang Sun , Zhifeng Wang

{"title":"Extreme design wave parameters optimization of typhoon wave for ocean engineering based on numerical simulation and observation data in the South China Sea","authors":"Dong Jiang , Bigui Huang , Qingsheng Miao , Hang Sun , Zhifeng Wang","doi":"10.1016/j.oceaneng.2025.120603","DOIUrl":"10.1016/j.oceaneng.2025.120603","url":null,"abstract":"<div><div>In this study, 20 typhoons in the South China Sea (SCS) from 2011 to 2022 are selected, based on the Weather Research and Forecasting (WRF) Grid Nudging assimilation technique, the physical parameterization schemes for hindcasting in the SCS during typhoons are Optimization. The best results for typhoon hindcasts are derived using Thompson_KF_YSU combination physical parameterization schemes. Compared to ERA5 reanalysis data, the RMSE decreased by 19.09% overall. Optimization of the physical parameterization scheme in the Simulating WAves Nearshore (SWAN) model using the optimized wind field as input shows that the default Wu wind drag formula overestimates the HS during typhoon events, particularly at higher wind speeds. Westhuysen wind input, FIL wind drag formula, AB whitecapping dissipation, and Madsen bottom friction achieved the best simulation results with the RMSE HS of 0.582m. The Poisson-Gumbel compound extreme value distribution is used to calculate typhoon waves at eight characteristic points in the SCS. The optimized scheme significantly improved the different return period compared to the default SWAN scheme, particularly in severe typhoon affected areas. In the coastal waters of Guangzhou, the 100-year and 50-year return period typhoon waves were improved by 1.12m and 0.96m, respectively, providing a more rational basis for engineering design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120603"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369631","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

Improved mode superposition method for hydrodynamic analysis of underwater piles under seismic excitations

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120537

Po-Chen Chen, Jiunn-Shyang Chiou

{"title":"Improved mode superposition method for hydrodynamic analysis of underwater piles under seismic excitations","authors":"Po-Chen Chen, Jiunn-Shyang Chiou","doi":"10.1016/j.oceaneng.2025.120537","DOIUrl":"10.1016/j.oceaneng.2025.120537","url":null,"abstract":"<div><div>Conventional mode superposition methods for seismic analysis of underwater structures are based on modal orthogonality. However, they introduce errors when dealing with hydrodynamic problems because the hydrodynamic term does not actually satisfy this property. Additionally, previous studies for hydrodynamic responses often assumed structures to be fixed on a rigid base; however, the embedded portion of piles cannot provide sufficient rigidity for the submerged portion as the rigid base does. In this study, we propose an improved method that addresses the non-orthogonality of the hydrodynamic term by incorporating the hydrodynamic force contributions from other modes. Furthermore, the method accounts for base flexibility by modeling the embedded portion of a pile as an equivalent spring matrix. Comparisons with the conventional method indicate that the hydrodynamic effects from other modes are significant under flexible base conditions or when there is pile-head mass. Moreover, parametric analyses of pile seismic responses under near-fault and far-field earthquakes reveal that base flexibility and pile-head mass significantly influence the hydrodynamic forces and associated pile response envelopes, depending on the proximity between the system's resonance frequency and the predominant frequencies of the input motions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120537"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349929","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

Theoretical and experimental investigation of a two-stage X-structure vibration isolation system with inerter coupling for marine equipment

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-07 DOI: 10.1016/j.oceaneng.2025.120351

Jinlin Bai, Tiangui Ye, Guoyong Jin, Yukun Chen, Wenke Li, Junjie Yuan

{"title":"Theoretical and experimental investigation of a two-stage X-structure vibration isolation system with inerter coupling for marine equipment","authors":"Jinlin Bai, Tiangui Ye, Guoyong Jin, Yukun Chen, Wenke Li, Junjie Yuan","doi":"10.1016/j.oceaneng.2025.120351","DOIUrl":"10.1016/j.oceaneng.2025.120351","url":null,"abstract":"<div><div>There is a growing concern about the use of the inerter to reduce low-frequency vibration and noise in ship and ocean engineering. The isolation performance of a traditional inerter-spring-damping vibration isolator outperforms that of a spring-damping isolator in the low-frequency range; however, it levels off at a constant value in the high-frequency range, and the resonant peak becomes large. This study proposes a novel vibration isolation system by horizontally integrating the inerter-spring-damping system into an X-structure and combining it with a two-stage vibration isolation mechanism. With the dynamic modeling, the transmissibility of the proposed vibration isolation system is derived through the frequency response function method. The acceleration, velocity inertance, and resonant frequency are theoretically analyzed by considering the influence of various structural parameters. Additionally, the effects of system parameters, including the number of layer, assembly angle, inerter ratio, and intermediate mass, on the isolation performance can improve in the low-frequency range and decline in the high-frequency range with a certain slope, and the resonant peak can be reduced, compared with the other nine types of scissor-like and vertical coupling structures. The multi-stage integrated structure can cumulatively expand the effective isolation frequency range while generating additional resonant and anti-resonance peaks. The isolation performance of the single-stage vibration system is validated using experimental prototypes and compared with the analytical method, demonstrating the correctness of the proposed theoretical model.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120351"},"PeriodicalIF":4.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369632","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

An integrated SWOT-based interval type-2 fuzzy AHP and TOPSIS methodology for digital transformation strategy selection in maritime safety

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120518

Muhammed Fatih Gulen , Esma Uflaz , Furkan Gumus , Muhittin Orhan , Ozcan Arslan

{"title":"An integrated SWOT-based interval type-2 fuzzy AHP and TOPSIS methodology for digital transformation strategy selection in maritime safety","authors":"Muhammed Fatih Gulen , Esma Uflaz , Furkan Gumus , Muhittin Orhan , Ozcan Arslan","doi":"10.1016/j.oceaneng.2025.120518","DOIUrl":"10.1016/j.oceaneng.2025.120518","url":null,"abstract":"<div><div>In the maritime industry, ships are inherently involved in many high-risk operations. Digital transformation has great potential to minimize risks by improving safety protocols. This study presents an integrated approach combining SWOT analysis, the Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2FAHP), and the Technique for Rank Preference by Similarity to Ideal Solution (TOPSIS) to identify and prioritize digital transformation strategies (DTS) aimed at improving maritime safety. The main objective of the study is to highlighting the importance of a strategic approach to digital transformation, focusing on solutions that facilitate operational safety, support proactive risk management, and enhance traceability, auditability, and procedural compliance. The research emphasizes the importance of a strategic approach to digital transformation, the critical role of digital monitoring and recording, and the efficacy of integrating operations-oriented digital solutions. The research results, which were confirmed by sensitivity analysis, show that the integrated method works well by showing that these strategies are prioritized in different situations. This study contributes to a theoretical understanding of digital transformation in maritime safety by providing a comprehensive framework for the systematic assessment of DTS. The research outputs have provided maritime stakeholders with actionable insights and a roadmap to improve their safety protocols. Overall, it promotes a safer, more efficient maritime industry.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120518"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369620","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 novel foundation design for the hybrid offshore renewable energy harvest system

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120519

Yukun Ma, Liang Cui, Suby Bhattacharya

{"title":"A novel foundation design for the hybrid offshore renewable energy harvest system","authors":"Yukun Ma, Liang Cui, Suby Bhattacharya","doi":"10.1016/j.oceaneng.2025.120519","DOIUrl":"10.1016/j.oceaneng.2025.120519","url":null,"abstract":"<div><div>Establishing a hybrid offshore renewable energy harvest system (HOREHS) on a shared platform can reduce energy costs and increase productions. This paper aims to propose a HOREHS supported by a foundation consisting of a monopile and a plate to integrate various offshore renewable energy devices. Taking the Sheringham shoal wind farm as a case study, the benchmarking monopile dimensions were determined using design guidance and an equivalent monopile-plate combination was determined from FEM simulations. Parametric studies of system mechanical responses were conducted using FEM simulation. It is found that, to maintain the same mechanical response, the embedded depth of the monopile supporting the HOREHS should be increased by about 17% comparing with that supporting an offshore wind turbine. Adding a 14 m diameter steel plate can avoid the extra 17% embedded depth. Adding a plate has no effect on the size of influence zone of lateral soil stress. However, due to the shorter embedded depth, the magnitude of lateral stress for the hybrid foundation is larger than that for monopile, with the maximum increase being about 18%. The system response at the mudline level shows the highest sensitivity to the changes in embedded depth and plate diameter.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120519"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369682","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

Parameterization of waves interacting with homogenous permeable breakwaters: Integrating physical and numerical models with machine learning

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120563

B. Rodrigo Covarrubias-Contreras , Alec Torres-Freyermuth , Camilo Rendón-Valdez , Christian M. Appendini , Ernesto Gray

{"title":"Parameterization of waves interacting with homogenous permeable breakwaters: Integrating physical and numerical models with machine learning","authors":"B. Rodrigo Covarrubias-Contreras , Alec Torres-Freyermuth , Camilo Rendón-Valdez , Christian M. Appendini , Ernesto Gray","doi":"10.1016/j.oceaneng.2025.120563","DOIUrl":"10.1016/j.oceaneng.2025.120563","url":null,"abstract":"<div><div>Breakwaters effectively reduce the incoming wave energy by wave dissipation and reflection. Thus, previous physical and numerical modelling studies have been devoted to improve the functionality and stability of these type of structures. However, less effort has been devoted to investigate the structural functionality of permeable breakwaters solely made of prefabricated elements. In this study, two-dimensional laboratory experiments on waves interacting with permeable breakwaters made of armor units were carried out in a wave flume. Analysis of laboratory data show that permeable breakwaters made of cubes presented larger dissipation and reflection coefficients than those made of tetrapods. A volume of fluid-type numerical model, based on the Volume-Averaged Reynolds-Averaged Navier-Stokes (VARANS) equations, was calibrated using the laboratory data. The VARANS model reproduces complex wave transformation processes including wave reflection, dissipation, and transmission. Hence, the numerical model was further employed to conduct a parametric study considering different breakwater geometry, water levels and wave conditions. New parametric formulations for estimating the wave reflection, transmission, and dissipation coefficients were developed using numerical modelling results and Machine Learning (ML). Hence, this study demonstrates the potential of combining physical and numerical modelling with ML for the study of wave-structure interaction.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120563"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significant wave height prediction based on variational mode decomposition and dual network model

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120533

Jiaxin Chen , Shibao Li , Jinze Zhu , Menglong Liu , Ran Li , Xuerong Cui , Lianghai Li

{"title":"Significant wave height prediction based on variational mode decomposition and dual network model","authors":"Jiaxin Chen , Shibao Li , Jinze Zhu , Menglong Liu , Ran Li , Xuerong Cui , Lianghai Li","doi":"10.1016/j.oceaneng.2025.120533","DOIUrl":"10.1016/j.oceaneng.2025.120533","url":null,"abstract":"<div><div>The precise prediction of significant wave height is crucial for industries such as fisheries, marine exploration, offshore power generation, and maritime transportation. However, due to the non-linearity and non-stationarity of significant wave height, traditional models often exhibit significant phase lag in medium to long-term predictions, leading to a decrease in prediction accuracy. To address this issue, this study proposes a hybrid model that combines variational mode decomposition (VMD), long short-term memory (LSTM), and temporal convolutional network (TCN), named VMD-DLT (Dualnet-LSTM-TCN), for high-precision significant wave height prediction. This study conducts a systematic comparison of the VMD-DLT, LSTM, TCN, and empirical mode decomposition (EMD)-based models (EMD-LSTM, EMD-TCN, CCEMDAN-LSTM and ICCEMDAN-LSTM) in the prediction tasks of 24-h, 36-h and 48-h using four publicly available ocean buoy datasets. The experimental results indicate that the VMD-DLT model significantly outperforms the other models across all time frames, confirming its effectiveness and stability in significant wave height prediction. Further experiments on the 46085 dataset for 24-h, 36-h, 48-h and 60-h predictions show that the DLT model has significantly higher prediction accuracy compared to single LSTM and TCN models. The VMD-LSTM, VMD-TCN, and VMD-DLT models, after applying VMD technology to decompose the non-stationary significant wave height time series, all show improved prediction effects, reducing the impact of phase lag. The Pearson correlation coefficient of the VMD-DLT model in all prediction tasks is 0.9546, 0.9382, 0.8462, and 0.7918, respectively, significantly outperforming other models, further verifying the scientific and practical potential of the VMD and DLT combination method.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120533"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369684","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

Hydrodynamic behavior of a long-large and irregular submarine pipeline adopting a novel immersion approach during immersion construction

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-06 DOI: 10.1016/j.oceaneng.2025.120578

Yanhong Su , Chunyan Li , Zhiwen Wu , Canrong Xie , Ankit Garg , Guanghui Chen , Hangang Hu , Peng Tan , Bo Zhang , Hengdong Wu

{"title":"Hydrodynamic behavior of a long-large and irregular submarine pipeline adopting a novel immersion approach during immersion construction","authors":"Yanhong Su , Chunyan Li , Zhiwen Wu , Canrong Xie , Ankit Garg , Guanghui Chen , Hangang Hu , Peng Tan , Bo Zhang , Hengdong Wu","doi":"10.1016/j.oceaneng.2025.120578","DOIUrl":"10.1016/j.oceaneng.2025.120578","url":null,"abstract":"<div><div>The hydrodynamic behavior of the long-large and irregular submarine pipeline (LISP) is expected to be different from that of the linear pipeline in immersion process. Further, the LISP is prone to cause the stress concentration, cables tension uneven distribution and cables taut-slack phenomenon. This further makes construction process for these types of pipelines more dangerous and uncontrollable. To reduce the potential risks and improve the stability of the immersion construction, a novel approach with a special immersion system is designed. Based on the pipeline theory, winch theory, and fluid loads theory, the numerical model is established. The hydrodynamic behavior of the pipeline immersion system during immersion is investigated. A sensitivity analysis is conducted with varying key parameters, such as the cable release velocity, airbag shape, and external environmental conditions. The results of the proposed numerical simulation show a high degree of consistency with the actual measured data. This novel immersion approach is feasible for the immersion construction of LISP. The cable tension and pipeline stress are very sensitive to the cable release velocity, wave height and tide. This study can provide valuable construction suggestions and avoid potential engineering risks and improve the economy for the immersion engineering of LISP.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"323 ","pages":"Article 120578"},"PeriodicalIF":4.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369681","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