Ocean Engineering最新文献_第5页

Analysis of dynamic response of a transmission tower under downburst wind-wave loads

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121069

Xiao Luo , Zehao Pan , Jian Ma , Yong Chen , Wending Mou , Wenjuan Lou

{"title":"Analysis of dynamic response of a transmission tower under downburst wind-wave loads","authors":"Xiao Luo , Zehao Pan , Jian Ma , Yong Chen , Wending Mou , Wenjuan Lou","doi":"10.1016/j.oceaneng.2025.121069","DOIUrl":"10.1016/j.oceaneng.2025.121069","url":null,"abstract":"<div><div>Under downburst conditions, the intricate wind-wave conditions for offshore transmission towers limit the accurate configuration of combined wind-wave loads and dynamic analysis. This study aims to establish the theoretical framework for the efficient dynamic analysis method associated with the reasonable load configuration. Based on the laboratory test, the downburst-generated wave's power spectral density is formulated, leading to the combined stochastic downburst wind-wave load. Thereby, the spectral representation method is employed to simulate the synchronous wind-wave loads. Furthermore, regarding the fluctuating component of combined load, an approximating method for dynamic analysis is developed by separating the response into background and resonant components, which is more efficient than the traditional time-domain and frequency-domain dynamic analysis methods. All the relevant equations are expressed in matrix form to facilitate using the modal analysis results obtained from the three-dimensional finite element model. Considering an offshore tower as the engineering background, the results show that the proposed approximating method effectively captures the tower's dynamic behavior with higher efficiency. A comparison of the dynamic response results, corresponding to the load cases involving and not involving wind-wave coherence reveals negligible deviation, indicating that the cross-power spectral density of wind and wave loads can be ignored in the analysis.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737312","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

Design and study of a bionic docking device for autonomous underwater vehicles

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-30 DOI: 10.1016/j.oceaneng.2025.121041

Juan Li, Qian Cong, Tingkun Chen

{"title":"Design and study of a bionic docking device for autonomous underwater vehicles","authors":"Juan Li, Qian Cong, Tingkun Chen","doi":"10.1016/j.oceaneng.2025.121041","DOIUrl":"10.1016/j.oceaneng.2025.121041","url":null,"abstract":"<div><div>Autonomous underwater vehicle (AUV) docking devices have been widely studied, however, the existing docking devices have the problems of damaging the AUV shell and low docking success. Based on the excellent hunting performance of octopus, this paper investigates and designs an octopus-like docking device. The structure of the device is similar to an octopus, and the actuator consists of four rows and four columns of sub-actuators, each of which moves independently and is equipped with a suction cup. Based on the sucker grasping mechanism of the octopus, the control scheme of the actuator is proposed. The finite element simulation method is used to analyze the structure of the device and optimize the drag reduction, and the docking process is simulated. The feasibility of the control scheme and the load-bearing capacity of the device are evaluated through physical experiments. The results show that the suction cup grasping will not damage the experimental shell, and the control scheme is feasible and can improve the docking success. When the pressure between each suction cup and the shell is 7 N, the maximum load capacity of the device is 11.2 kg, and the docking device has a certain load capacity.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121041"},"PeriodicalIF":4.6,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735299","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

Evaluation of Australian offshore wind and wave energy resources for joint exploitation

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-30 DOI: 10.1016/j.oceaneng.2025.121066

Shabnam Hosseinzadeh , Rodney A. Stewart , Bahareh Kamranzad , Amir Etemad-Shahidi

{"title":"Evaluation of Australian offshore wind and wave energy resources for joint exploitation","authors":"Shabnam Hosseinzadeh , Rodney A. Stewart , Bahareh Kamranzad , Amir Etemad-Shahidi","doi":"10.1016/j.oceaneng.2025.121066","DOIUrl":"10.1016/j.oceaneng.2025.121066","url":null,"abstract":"<div><div>The diminishing supply of fossil fuels and the critical need for environmental protection have increased the emphasis on renewable energy sources to achieve clean energy. Offshore wind and wave energy resources offer significant potential and consistent availability. This study explores the joint exploitability of these energy resources in the Australian offshore region using a two-stage framework. The first stage identifies hotspots based on energy resources potential, variability, cross-correlation, and their complementarity by providing a heatmap using over four decades of re-analysis and hindcast data. The second stage ranks the selected hotspots by assessing extreme weather conditions and site accessibility for operations and maintenance. The study identifies ten optimal sites, on the western and southern coasts of Australia, with high energy potential, low cross-correlation, low variability, high complementarity, and acceptable accessibility. Finally, the performance of four combinations of offshore wind turbines (OWTs) and wave energy converters (WECs) was analyzed at these hotspots. The results showed that the SWT-Wave Star combination generally outperforms others, while SWT-Wave Dragon is optimal in some cases. These combinations offer higher annual energy production, capacity factor, and manageable power variability, making them ideal for maximizing energy production and operational stability.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121066"},"PeriodicalIF":4.6,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735298","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

Optimizing a monopile with a bottom-supported tension leg tower concept for offshore wind turbine in intermediate waters

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-30 DOI: 10.1016/j.oceaneng.2025.121055

Mohd Ishtiyak, Arunjyoti Sarkar

{"title":"Optimizing a monopile with a bottom-supported tension leg tower concept for offshore wind turbine in intermediate waters","authors":"Mohd Ishtiyak, Arunjyoti Sarkar","doi":"10.1016/j.oceaneng.2025.121055","DOIUrl":"10.1016/j.oceaneng.2025.121055","url":null,"abstract":"<div><div>Bottom supported Offshore Wind Turbines are dominating the offshore wind energy market today. Researchers are trying to develop novel concepts to increase the cost effectiveness of such structures at deeper waters where conventional concepts appear to be massive and expensive.</div><div>The Bottom Supported Tension Leg Tower (BSTLT) concept introduces the use of a traditional monopile or jacket structure, combined with a system of pretensioned tethers and a hinge, aimed at reducing the design bending moment at the base. While the effectiveness of this approach has been demonstrated for a monopile design at a 50-m water depth, no structural optimization has yet been undertaken. Such optimization is essential to identify potential material savings and cost benefits.</div><div>In this study, structural optimization of a monopile, both with and without the BSTLT concept, has been conducted at a 50-m water depth using a Genetic Algorithm. The analysis was performed in the frequency domain, and the optimized structure was subsequently re-evaluated in the time domain to validate the results.</div><div>The results show that the required cross-sectional area of a monopile design with conventional approach for the stated water depth can be significantly reduced when BSTLT concept is used.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121055"},"PeriodicalIF":4.6,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic characteristics of subsea structures being lifted out of water in irregular waves

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.oceaneng.2025.121044

Yingfei Zan , Zhongming Li , Feng Li , Licheng Qin , Fuxiang Huang , Baowen Qi

{"title":"Dynamic characteristics of subsea structures being lifted out of water in irregular waves","authors":"Yingfei Zan , Zhongming Li , Feng Li , Licheng Qin , Fuxiang Huang , Baowen Qi","doi":"10.1016/j.oceaneng.2025.121044","DOIUrl":"10.1016/j.oceaneng.2025.121044","url":null,"abstract":"<div><div>The exit of structures from water bodies in the presence of irregular waves is a key issue in offshore lifting operations. This study investigates the dynamic characteristics of structures during the water-exit process in irregular waves using experiments and numerical simulations. The analysis focuses on cable tension and structural motion. The results show that irregular waves significantly affect the structural motion, with notable pitch motion occurring after the structure has fully exited the water. The maximum cable tension increases as the sea state becomes more severe. The ideal environmental conditions for lifting operations occur when the significant wave height <em>H</em><sub>s</sub> ≤ 1.5 m. When <em>H</em><sub>s</sub> > 2 m, the cable tension increases significantly, and large fluctuations occur. The dynamic effect of cable tension, which follows a normal distribution, increases as the severity of the sea state rises, and reaches its maximum value when the structure passes through the splash zone. This study provides a reliable basis for assessing the safety of offshore lifting operations in irregular waves.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121044"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725481","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 investigation of remediation techniques for enhancing the seismic performance of offshore caisson-type composite breakwaters on liquefiable seabed soils

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.oceaneng.2025.121035

Babak Ebrahimian , Mohammad Roshanfar , Abbas Ghalandarzadeh

{"title":"Experimental investigation of remediation techniques for enhancing the seismic performance of offshore caisson-type composite breakwaters on liquefiable seabed soils","authors":"Babak Ebrahimian , Mohammad Roshanfar , Abbas Ghalandarzadeh","doi":"10.1016/j.oceaneng.2025.121035","DOIUrl":"10.1016/j.oceaneng.2025.121035","url":null,"abstract":"<div><div>This study examines the failure mechanisms of offshore caisson-type composite breakwaters (OCCBs) under seismic loading through 1g shaking table model tests, comparing cases with and without remediation measures against seabed soil liquefaction. For this purpose, several countermeasures are implemented, comprising wraparound geogrid inclusions within the rubble mound layer, stone columns and compacted improvement zones in the seabed soil, all aimed at enhancing the seismic resilience and stability of OCCBs. Six physical model tests are conducted to evaluate the effectiveness of the applied remediation measures in minimizing liquefaction-induced deformations of OCCBs, including settlement, lateral movement, and tilting. Experimental findings indicate that the caisson settlement is primarily caused by the lateral flow of the foundation soil and the rubble mound layer. The combined use of stone columns and wraparound geogrid reinforcements efficiently mitigates this lateral flow. Notably, remediating just 2.8 % of the liquefiable seabed soil with stone columns decreases OCCB settlement and tilting by 45.4 % and 31 %, respectively, compared to the non-remediated model. Additionally, incorporating wraparound geogrid reinforcements within the rubble mound layer results in even further reductions of settlement and tilting by 90.6 % and 91.3 %, respectively. This research offers valuable insights for developing effective countermeasures to mitigate seismic-induced damage to OCCBs seated on liquefiable seabed soils.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121035"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725490","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

Thermal aspects of submarine cables in bend stiffeners

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.oceaneng.2025.121027

W. Poradowski , G.J. Anders

{"title":"Thermal aspects of submarine cables in bend stiffeners","authors":"W. Poradowski , G.J. Anders","doi":"10.1016/j.oceaneng.2025.121027","DOIUrl":"10.1016/j.oceaneng.2025.121027","url":null,"abstract":"<div><div>This paper examines thermal behavior of a submarine power cable placed in a bend stiffener. The severity of thermal conditions for power cables in offshore platform installations is emphasized. First, a finite element analysis (FEM) of such an installation fully submerged in water is performed to determine which aspects of the model have the greatest influence on the computed temperature of the cable. This is followed by the development of the analytical model for current rating calculations for submarine installations considering short thermal bottlenecks. The analytical model implements the Galerkin approach for solving steady-state axisymmetric heat conduction problem. The FEM study shows the importance of the applied boundary conditions for the convective heat transfer in the gap between the inner diameter of the bend stiffener and the diameter of the cable. For the power cable rating calculations purpose, if the heat from the cable surface in a semi-enclosed water gap is assumed to dissipate by conduction only, pessimistic results of the cable ampacity are obtained. On the other hand, for the installation of the submarine cable in the bend stiffener placed in air examined with FEM analyses, the results suggest that the convective component in the gap may be disregarded.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121027"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725491","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

Construction of a virtual dataset of maritime search and rescue targets for unmanned aerial vehicles

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.oceaneng.2025.120926

Zhenqiang Zhao , Helong Shen , Xiao Liang , Lucai Wang , Bing Han

{"title":"Construction of a virtual dataset of maritime search and rescue targets for unmanned aerial vehicles","authors":"Zhenqiang Zhao , Helong Shen , Xiao Liang , Lucai Wang , Bing Han","doi":"10.1016/j.oceaneng.2025.120926","DOIUrl":"10.1016/j.oceaneng.2025.120926","url":null,"abstract":"<div><div>The success of Unmanned Aerial Vehicle (UAV) Maritime Search and Rescue (SAR) missions is highly dependent on the accurate detection and identification of ship targets, and the construction of high-quality datasets is the key to improving the performance of the algorithms. Existing real datasets suffer from high annotation cost, insufficient scene diversity, and difficulty in covering complex sea state and occlusion conditions. For this reason, this study proposes a virtual ship dataset generation method based on Unity3D, aiming to provide low-cost, highly automated and accurately labelled virtual data for UAV maritime search and rescue missions. The method generates diverse ship postures and backgrounds by constructing a large-scale marine scene simulation system, integrating dynamic weather, light, waves and other environmental variables, and designing three UAV shooting modes. Meanwhile, combining with the MVP transform principle in computer graphics, the automatic labelling of virtual ship bounding boxes is achieved, and the difference between virtual images and real scenes is reduced by post-processing techniques. In addition, the hybrid training strategy further validates the enhancement of virtual data on the generalisation ability of the model. In the hybrid training experiments with real and virtual data on two types of datasets, <span><math><mrow><mi>m</mi><mi>A</mi><msub><mi>P</mi><mrow><mn>0.5</mn><mo>:</mo><mn>0.95</mn></mrow></msub></mrow></math></span> improved by 1.4 %,2.3 %, 1.4 %, 3.2 %, 0.5 % and 4.0 % respectively. The experimental results show that it is feasible to train and test a UAV maritime search and rescue target detector using the generated virtual dataset and demonstrate the improved model performance.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 120926"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725492","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

Structural response analysis of different submerged floating tunnel route selection conditions in the complex strait under the action of typhoon Sepat

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.oceaneng.2025.121072

Cheng Cui , Bo Huang , Minglin Chen , Wenlong Luo , Jianting Zhou , Hao Ding , Ke Li , Liang Cheng , Dan Zhong , Jiawei Zhou

{"title":"Structural response analysis of different submerged floating tunnel route selection conditions in the complex strait under the action of typhoon Sepat","authors":"Cheng Cui , Bo Huang , Minglin Chen , Wenlong Luo , Jianting Zhou , Hao Ding , Ke Li , Liang Cheng , Dan Zhong , Jiawei Zhou","doi":"10.1016/j.oceaneng.2025.121072","DOIUrl":"10.1016/j.oceaneng.2025.121072","url":null,"abstract":"<div><div>The submerged floating tunnel (SFT), a newly proposed tunnel engineering concept, will replace traditional sea-crossing bridges potentially. The SFT has the advantages of the cost, environmental protection, and terrain adaptability. Existing route proposals for SFT suggest its possible construction in the strait on the western coast of the Pacific Ocean. However, these straits are frequently threatened by typhoon disasters, making it crucial to study the mechanical response of SFT under extreme marine environmental conditions. Therefore, this study has focused on the strait in it and utilized the ADCIRC hydrodynamic model and the SWAN wave model to assess storm surge disaster risks in the region. The finite element software ABAQUS has been used to model the SFT. The study has discussed the spatiotemporal heterogeneity of the coupled response between typhoon waves and the SFT, and the sensitivity of structural parameters under extreme marine conditions. The results indicate that: (1) The dynamic response of the SFT during the movement of the typhoon showed significant variation. (2) Increasing the elastic modulus and diameter of the cables significantly reduced the mechanical response fluctuation of SFT caused by typhoon. (3) The submerged depth of the SFT in the Penghu channel section was suggested to be set to 55–65 m when the typhoon is considered.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121072"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725479","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

ADP-based secure trajectory tracking for unmanned surface vehicles with false data injections

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.oceaneng.2025.121043

Yanwei Huang, Guozhen Lai

引用次数: 0