Ocean Engineering最新文献_第9页

Experimental study on the irregular wave-induced pore pressure of a sloping beach with cross-shore profile evolution

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-24 DOI: 10.1016/j.oceaneng.2025.120680

Titi Sui, Yunhan Yang, Zhendi Yang, Chi Zhang, Jinhai Zheng

{"title":"Experimental study on the irregular wave-induced pore pressure of a sloping beach with cross-shore profile evolution","authors":"Titi Sui, Yunhan Yang, Zhendi Yang, Chi Zhang, Jinhai Zheng","doi":"10.1016/j.oceaneng.2025.120680","DOIUrl":"10.1016/j.oceaneng.2025.120680","url":null,"abstract":"<div><div>Wave-induced seabed response, associated with beach instability, is a great concern to the coastal engineers. Previous studies mostly focused on the flat seabed, neglecting the effects of wave nonlinear transformation (<span><math><mrow><mi>e</mi><mo>.</mo><mi>g</mi><mo>.</mo></mrow></math></span> wave shoaling, breaking) and complex underwater bed morphology that is commonly seen in a natural beach condition. This study performed a series of physical experiments to investigate the temporal and spatial distribution of pore pressure inside a sloping beach that is subjected to irregular waves. Cross-shore beach evolution profiles over a continuous 60-h period were prepared, and 15 h of these were used for the pore pressure recording and analysis. Effects of <span><math><mrow><mi>e</mi><mo>.</mo><mi>g</mi><mo>.</mo></mrow></math></span> non-linear wave loading, bed morphology, and seabed thickness on the pore pressure response were systematically examined. Based on dimensional analysis, one empirical model was proposed for the prediction of wave-induced pore pressure inside the sloping beach. The main findings of this study indicate that (1) low-frequency components of the pore pressure signal are found chiefly below the sandbar and are more sensitive to the sandbar movement, (2) the increasing wave nonlinearity (Ursell number) would decrease the normalized pore pressure which indicates the normalized pore pressure has a gradual decrease with wave shoaling process from offshore to nearshore, and (3) the local slope of the seabed is found with a negative correlation to pore pressure, <span><math><mrow><mi>i</mi><mo>.</mo><mi>e</mi><mo>.</mo></mrow></math></span>, an increase in local slope decreases the magnitude of pore pressure.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120680"},"PeriodicalIF":4.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474204","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

Position-based Dubins-RRT* path planning algorithm for autonomous surface vehicles

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-24 DOI: 10.1016/j.oceaneng.2025.120702

Ji Zhang , Guiyong Zhang , Zhouhua Peng , Huan Hu , Zhifan Zhang

{"title":"Position-based Dubins-RRT* path planning algorithm for autonomous surface vehicles","authors":"Ji Zhang , Guiyong Zhang , Zhouhua Peng , Huan Hu , Zhifan Zhang","doi":"10.1016/j.oceaneng.2025.120702","DOIUrl":"10.1016/j.oceaneng.2025.120702","url":null,"abstract":"<div><div>Path planning is a critical technology for developing autonomous surface vehicles (ASVs). The goal is to plan a collision-free, feasible, and optimal path from a defined start state to a target state in an environment with obstacles. The existing Dubins-RRT* algorithm can satisfy this requirement, but it is still inadequate in terms of path quality and computational efficiency. This paper proposes an efficient position-based Dubins-RRT* (P-Dubins-RRT*) algorithm. Specifically, the local Dubins problem is reduced to a relaxed Dubins problem, as only the position coordinates are sampled during the planning process. The fundamental expansion curves are shortened Dubins paths, while complete Dubins paths are employed for goal-state connection and rewire. The efficiency of path planning is enhanced by accelerating tree expansion, which is achieved by eliminating the constraint of heading angle. Simulation results indicate that the proposed P-Dubins-RRT* efficiently balances planning efficiency and path feasibility. On the test maps, P-Dubins-RRT* reduces the initial path generation time by an average of 70.3% compared to Dubins-RRT* and demonstrates superiority in path quality. The proposed method is applicable to issues of local path planning for vehicles with turning constraints in two-dimensional space.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120702"},"PeriodicalIF":4.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474205","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

Development and validation of a fully coupled dynamic analysis tool for an articulated foundation offshore wind turbine

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-23 DOI: 10.1016/j.oceaneng.2025.120677

Pei Zhang , Cui Li , Jiayang Gu , Yaoyu Hu , Yan Li , Yougang Tang

{"title":"Development and validation of a fully coupled dynamic analysis tool for an articulated foundation offshore wind turbine","authors":"Pei Zhang , Cui Li , Jiayang Gu , Yaoyu Hu , Yan Li , Yougang Tang","doi":"10.1016/j.oceaneng.2025.120677","DOIUrl":"10.1016/j.oceaneng.2025.120677","url":null,"abstract":"<div><div>Offshore wind turbines are located in complex marine environments where various components interact with environmental loads, leading to complex dynamic responses. Numerical simulation methods can more quickly and conveniently explore their complex coupled dynamic response characteristics. This paper developed a simulation framework that includes multi-body dynamics, aerodynamics, hydrodynamics, seismic dynamics, and controller dynamics, and programmed as an integrated code ADRT (short for AFOWT Dynamic analysis and Responses prediction Tool), for the fully coupled dynamic analysis of offshore wind turbines (OWTs). Unlike conventional wind turbine numerical programs, ADRT can address the response of wind turbine systems under various complex environmental loads, including waves, currents, wind, and earthquakes. Moreover, the program modules in ADRT are not encapsulated, allowing users to modify the kinetics equations and load conditions based on their specific requirements. To better verify the effectiveness of the program, we used a case study of an articulated foundation offshore wind turbine (AFOWT) as an example and conducted a comparative analysis between ADRT and Openfast programs. The results show that the calculation errors of loads and structural responses for both programs are within 5%. This indicates that the newly-developed coupling code, possesses satisfactory capabilities for conducting fully coupled simulation analysis of OWTs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120677"},"PeriodicalIF":4.6,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471376","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 variational Bayesian deep learning framework for reconstructing the particle image velocity field of pump-jet propulsor

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-23 DOI: 10.1016/j.oceaneng.2025.120401

Chengcheng Qiu , Jinping Wu , Jing Yang , Minghua Lu , Guang Pan

{"title":"A novel variational Bayesian deep learning framework for reconstructing the particle image velocity field of pump-jet propulsor","authors":"Chengcheng Qiu , Jinping Wu , Jing Yang , Minghua Lu , Guang Pan","doi":"10.1016/j.oceaneng.2025.120401","DOIUrl":"10.1016/j.oceaneng.2025.120401","url":null,"abstract":"<div><div>This study establishes a novel super-resolution (SR) framework for reconstructing the low resolution (LR) velocity field of pump-jet propulsor (PJP) obtained by particle image velocimetry (PIV) method, which combines down-sampled skip-connection/multi-scale (DSC/MS) models and variational Bayesian (VB) theory to form the VB-DSC/MS model. The PIV method is can obtain the spatial-temporal velocity field of PJP, while the PIV method consumes expensive costs and a lot of time. The VB-DSC/MS method can investigate the real information of PIV velocity field and spatial-temporal prior knowledge to establish nonlinear relationships, and which will obtain the SR flow field. The investigate uses velocity field data obtained by improved delayed detached eddy simulation (IDDES) and PIV methods as data-sets, which learned the accuracy and uncertainty distribution of reconstructing the axial wake flow field at different conditions using VB-DSC/MS method. The results show that the SR method has a higher accuracy to reconstruct the contour and wake evolution of LR velocity field obtained by PIV method. It can accurately reconstruct the fluid acceleration region, hub low-velocity region, and mixed flow region of PIV field, and which the improvement factor can reach to 256. Although there is a higher uncertainty distribution at a larger scaling factors, all reconstructed velocity field data are within a 95% confidence interval.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120401"},"PeriodicalIF":4.6,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471306","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 study on ice load evolution and ice crushing mechanism of 2D rigid hydrofoil ice-cutting based on Peridynamics theory

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-23 DOI: 10.1016/j.oceaneng.2025.120577

Chenxu Gu , Kang Han , Chengjie Cao , Chao Wang , Chunhui Wang , Yuan Zhang

引用次数: 0

Hydrodynamic and power-capturing performances of a multi-tube oscillating water column device: An experimental study

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-22 DOI: 10.1016/j.oceaneng.2025.120736

Lihui Huang , Xiaochen Dong , Chuanli Xu , Zhen Liu , Ruijie Sun

{"title":"Hydrodynamic and power-capturing performances of a multi-tube oscillating water column device: An experimental study","authors":"Lihui Huang , Xiaochen Dong , Chuanli Xu , Zhen Liu , Ruijie Sun","doi":"10.1016/j.oceaneng.2025.120736","DOIUrl":"10.1016/j.oceaneng.2025.120736","url":null,"abstract":"<div><div>An innovative oscillating water column device with a compact tube array, called the “PILOT” device, is proposed and tested experimentally. The device consists of twelve tubes arranged in two rows and six columns, sharing a common chamber. Regular and irregular wave scenarios with various tube lengths and drafts are employed in the tests. The effects of the relative distance between the tubes, the relative tube draft, and the relative tube length difference on the hydrodynamic, aerodynamic, and energy-harvesting performance of the device model are analyzed. In regular wave scenarios, for various relative drafts and tube length differences, the relative distance between the tubes significantly influences the performance of the device model, with the peak capture width ratio reaching 0.31. In irregular wave scenarios, the average amplitude differences in the free-surface elevation among different tubes, the air pressure variation in the shared chamber, the pneumatic power, and the capture width ratio decrease significantly. The peak capture width ratio is obtained at 0.34. The phase difference between the tubes greatly influences the performance of the shared chamber, which presents opportunities for improvement to enhance the overall performance of the device.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120736"},"PeriodicalIF":4.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465316","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

Comparative design space exploration of centred and off-centred semisubmersible configurations for floating offshore wind turbines

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-22 DOI: 10.1016/j.oceaneng.2025.120740

Claudio A. Rodríguez Castillo , Maurizio Collu , Feargal Brennan

{"title":"Comparative design space exploration of centred and off-centred semisubmersible configurations for floating offshore wind turbines","authors":"Claudio A. Rodríguez Castillo , Maurizio Collu , Feargal Brennan","doi":"10.1016/j.oceaneng.2025.120740","DOIUrl":"10.1016/j.oceaneng.2025.120740","url":null,"abstract":"<div><div>Achieving net-zero carbon goals demands an accelerated energy transition, with offshore wind energy emerging as a key contributor due to its vast potential. While floating offshore wind turbines (FOWTs) have seen significant progress through demonstrators, scaling up turbine capacities and deploying large-scale wind farms require further research and innovation. This study explores the design trade-offs between centred and off-centred semisubmersible configurations in FOWTs, using the UMaine and WindFloat designs as base for representative case studies. Parametric analyses were conducted to evaluate key aspects such as dimensioning, mass properties, equilibrium, intact stability, natural periods, and wave-induced loads, applied to the 15-MW IEA reference wind turbine at Scotland's NE8 offshore site. The findings reveal that off-centred semisubmersible configurations face significant challenges due to stringent ballast distribution constraints, which restrict the feasible design space. Conversely, centred semisubmersible configurations demonstrated better overall performance across key design metrics, achieving these outcomes with notably less hull steel mass. These results highlight the critical influence of tower placement on floating substructure design, emphasising the importance of refining and optimising proven configurations to support the development of efficient, large-scale floating wind energy systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120740"},"PeriodicalIF":4.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465313","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

A data-driven based hybrid multi-branch framework for AUV navigation

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-22 DOI: 10.1016/j.oceaneng.2025.120675

Xin Zhang , Li Sheng , Bo He , Yunpeng Lu

{"title":"A data-driven based hybrid multi-branch framework for AUV navigation","authors":"Xin Zhang , Li Sheng , Bo He , Yunpeng Lu","doi":"10.1016/j.oceaneng.2025.120675","DOIUrl":"10.1016/j.oceaneng.2025.120675","url":null,"abstract":"<div><div>In the Autonomous Underwater Vehicle (AUV) navigation task, aiming at the problem that traditional state estimation techniques introduce multiple errors affecting the navigation accuracy, and considering the uniqueness of different navigation sensor parameters, this paper proposes a hybrid multi-branch network framework for high-precision AUV navigation that can extract local characteristics while capturing the long-term temporal dependence of the input sequences. Firstly, each input time series is separately processed by the One Dimensional-Convolutional Neural Network (1D-CNN) based feature extraction module to provide a feature representation with various parameters. After that, the extracted features are concatenated to obtain a new time series and fed into the Long Short-Term Memory (LSTM)-based feature fusion module to learn the long-term temporal dependencies in the series. Finally, the output of the network can be obtained by performing regression calculations through the Fully Connected (FC) layer. Sailfish 210 AUV actual sea trial data has been used to validate the effectiveness of the proposed algorithm.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120675"},"PeriodicalIF":4.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465318","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 on cavity evolution characteristics of structure passing through crushed ice area

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-22 DOI: 10.1016/j.oceaneng.2025.120754

Lin Lu , Shuai Yang , Yanxiao Hu , Kaimin Chen , Zhe Yang , Yongdong Cheng

{"title":"Experimental investigation on cavity evolution characteristics of structure passing through crushed ice area","authors":"Lin Lu , Shuai Yang , Yanxiao Hu , Kaimin Chen , Zhe Yang , Yongdong Cheng","doi":"10.1016/j.oceaneng.2025.120754","DOIUrl":"10.1016/j.oceaneng.2025.120754","url":null,"abstract":"<div><div>To investigate the influence of the crushed ice cover density on the structure's water-entry cavity evolution, experiments were conducted with three different crushed ice cover densities based on water-entry experimental platform. By comparing the water-entry process of an inclined structure in different conditions, the influence of ice cover density on cavity evolution during the water-entry process is analyzed. The results show that the crushed ice will hinder the outward expansion of the liquid surface fluid, resulting in the reduction of the diameter of the cavity; the crushed ice will also hinder the inward contraction of the free surface fluid, prolonging the time of the expansion of the cavity, then the total volume of air within the cavity will augment, resulting in a reduction of the pressure differential between the interior and exterior of the cavity, which will ultimately lead to a delay in the time of the cavity's closure. As the density of the crushed ice cover increases, its inward contraction of the free surface fluid obstruction is gradually enhanced, further prolonging the closure time of the cavity, the length and maximum diameter of the cavity is also increased accordingly. In lower crushed ice cover densities, jets point to the interior of the cavity during its collapse. In addition, under the condition of higher crushed ice cover densities, the wall of the cavity is wrinkled by the irregular impact of the fluid. Cavity closure occurs below the free surface, and the large influx of air slows down the collapse of the cavity, with the increase in the depth of the structure into the water, the cavity occurs a deep necking phenomenon under the effect of ambient pressure.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120754"},"PeriodicalIF":4.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465333","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

Investigation of the effect of blade angle of Archimedes spiral hydrokinetic turbine based on hydrodynamic performance and entropy production theory

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-22 DOI: 10.1016/j.oceaneng.2025.120731

Ke Song , Hui-Ting Huan , Liu-Chuang Wei , Chun-Xia Liu

{"title":"Investigation of the effect of blade angle of Archimedes spiral hydrokinetic turbine based on hydrodynamic performance and entropy production theory","authors":"Ke Song , Hui-Ting Huan , Liu-Chuang Wei , Chun-Xia Liu","doi":"10.1016/j.oceaneng.2025.120731","DOIUrl":"10.1016/j.oceaneng.2025.120731","url":null,"abstract":"<div><div>The Archimedes Spiral Hydrokinetic Turbine (ASHT) represents a novel design specifically engineered to operate in low-speed ocean currents. However, the characteristics of energy losses associated with these turbines have not yet been fully understood. This paper examines nine ASHTs with varying blade angle configurations. The analysis of the hydrodynamic performance and energy loss characteristics of these turbines, under both axial and yawed flow conditions, is conducted using computational fluid dynamics in conjunction with entropy production theory. The results indicate that ASHTs with larger blade angles can operate across a broader range of tip speed ratios, achieving optimal power performance at higher tip speed ratios and generating greater thrust. In contrast, variable blade angle configurations demonstrate higher peak power but exhibit lower thrust and a narrower operating range of yaw angles compared to their fixed blade angle counterparts. The wake region behind the ASHT with a larger blade angle is characterized by a more extensive low-velocity area and a prominent hub recirculation zone. The energy loss occurring in the wake region is primarily attributed to the vortices generated at the tip and hub, with hub vortices being the main contributors to increased entropy production rates for configurations with larger blade angles. Under yawed flow conditions, an increase in yaw angle results in significant reductions in power and thrust, altered wake structures, and an increase in total entropy production. These findings provide crucial insights for the design and optimization of ASHTs, ultimately contributing to the development of more efficient and cost-effective ocean current power generation systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"324 ","pages":"Article 120731"},"PeriodicalIF":4.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465319","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