Ocean Engineering最新文献

{"title":"Numerical study on mean and turbulent characteristics of an oscillating jet under the effect of currents","authors":"Zhenshan Xu ,&nbsp;Wanru Zhang ,&nbsp;Yongping Chen ,&nbsp;Shunqi Pan","doi":"10.1016/j.oceaneng.2024.120035","DOIUrl":"10.1016/j.oceaneng.2024.120035","url":null,"abstract":"<div><div>The mean flow and turbulent characteristics of oscillating jets in the current environment are investigated using a three-dimensional large eddy simulation (LES) model. The effect of dimensionless parameters on oscillating jets is analyzed. Moreover, the mean flow velocity distributions of the downstream sections in the oscillating jet in the current environment and wave-current coexisting environment are compared. The results show that increasing the jet-to-current velocity ratio (<em>R</em>_<em>jc</em>) and the amplitude-to-jet velocity ratio (<em>R</em>_<em>aj</em>) can significantly increase the impact height and spreading range of the jet column, reduce its bending degree, and increase turbulence intensity, whereas the Strouhal number (<em>S</em>_<em>t</em>) has a minimal effect on the motion of the oscillating jet. Oscillating jets in a current environment and non-oscillating jets in a wave-current coexisting environment exhibit similar flow characteristics and mean velocity distributions, particularly when <em>R</em>_<em>aj</em>/<em>R</em>_<em>wc</em> is small, but the inconsistency in the range of action leads to stronger vertical penetration of the oscillating jets. This study reveals that the oscillating jet has a positive effect on mixing and dilution.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120035"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A framework for planning underwater hull inspections based on computer vision and degradation assessment","authors":"Edilson Gabriel Veruz ,&nbsp;Alécio Julio Silva ,&nbsp;Miguel Angelo de Carvalho Michalski ,&nbsp;Renan Favarão da Silva ,&nbsp;Gilberto Francisco Martha de Souza ,&nbsp;Anderson Takehiro Oshiro","doi":"10.1016/j.oceaneng.2024.120053","DOIUrl":"10.1016/j.oceaneng.2024.120053","url":null,"abstract":"<div><div>Traditional underwater hull inspections, which rely heavily on human divers, face significant challenges such as safety hazards and dependency on expert judgment. Recent technological advancements, such as remotely operated vehicles and artificial intelligence, offer promising alternatives to address these limitations and enhance the efficiency and safety of underwater inspections. This paper proposes a framework for planning underwater hull inspections based on computer vision and degradation assessment. The proposed modeling includes three main processes: Detect degradation, Assess degradation, and Perform maintenance decision-making. The degradation detection process utilizes Convolutional Neural Networks for computer vision to identify structural degradations such as corrosion and cracks through automatic image analysis. Then, the degradation assessment process assesses the hull degradation based on measurements such as material loss to provide a comprehensive understanding of structural integrity. Finally, the maintenance decision-making process guides the decision on maintenance tasks based on the Remaining Useful Life estimates. Through a case study, the proposed framework was demonstrated considering the operational context of Floating Production Storage and Offloading (FPSO). As a result, the proposed framework showed to be consistent in identifying different types of structural degradations based on a U-Net architecture and supporting underwater hull inspection planning.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120053"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydroacoustic optimization with using 3D viscous-based Noise-GAN","authors":"Serhad Aytaç,&nbsp;Baha Zafer","doi":"10.1016/j.oceaneng.2024.120021","DOIUrl":"10.1016/j.oceaneng.2024.120021","url":null,"abstract":"<div><div>In recent years, noise pollution has significantly affected marine organisms, necessitating the implementation of certain restrictions and safety protocols. The primary objective of these restrictions is to reduce the noise produced by human-operated vehicles in aquatic environments. For this reason, hydroacoustical studies are increasingly being integrated into design processes. This study aims to introduce an innovative approach to the design of hydrofoils, which are regarded as a critical component in hydroacoustic design. The focus of this approach is to develop an advanced optimization tool by integrating machine learning with hydroacoustic performance calculations. This study presents the 3D viscous-based Noise-GAN method, which innovatively combines Generative Adversarial Networks (GAN) algorithms with hydroacoustic performance calculations, enhanced by 3D viscous-based performance calculators. In contrast to the inviscid-based versions, this method, which incorporates 3D and viscous effects, allows for a comparative analysis of the impacts of these effects on the optimization process. Particularly, the performance of optimal geometries obtained through both 3D and 2D solvers will be compared, elucidating the role of 3D effects in the optimization process. This study addresses the drawbacks of 2D profile solutions in the optimization process, which generally offer a rapid solution in the field of machine learning for shape optimization. The effects have been examined at three different angles of attack (AoA). Thus, the positive and negative impacts on the optimization process under challenging environmental conditions have been identified. Additionally, cavitation constraints have been incorporated into the optimization process, ensuring that only profiles devoid of cavitation risk under the specified conditions are considered. Through the utilization of GAN algorithms, innovative profile geometries that do not present cavitation hazards at various angles of attack have been developed. The performance of the obtained optimal geometries has been compared to the widely utilized NACA0009 profile. By comparing the performance of the newly derived geometries with that of a profile with average performance, meaningful insights have been drawn. The results from the 3D viscous-based Noise-GAN method have been presented alongside the outputs derived from the 2D viscous-based method and the performance results of the NACA0009 profile under different Angle of Attack (AoA) conditions in this study.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120021"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study on the wave attenuation performance of a water ballast type floating breakwater","authors":"Xinran Ji ,&nbsp;Xu Li ,&nbsp;Aoming Tang ,&nbsp;Daoru Wang ,&nbsp;Li Zou ,&nbsp;Zhiwen Yang","doi":"10.1016/j.oceaneng.2024.120089","DOIUrl":"10.1016/j.oceaneng.2024.120089","url":null,"abstract":"<div><div>The influence of liquid sloshing within a water ballast type floating breakwater is numerically investigated to assess its effect on overall wave attenuation performance. Liquid sloshing increases the dissipation of incoming wave energy, thereby enhancing the wave attenuation performance. When the incident wave period approaches the natural frequency of the sloshing, resonance occurs in ballast tank, leading to significant non-linear sloshing inside the tank. Under the combined action of the internal liquid and external waves, the transmitted wave behind the floating breakwater is amplified, leading to a trend of reduced wave attenuation performance. The natural frequency of liquid sloshing can be adjusted by dividing the tank into two separate compartments with a baffle, the wave attenuation performance can be increased by up to 51.6%. In practical applications, the natural sloshing frequency in the ballast tank should be kept away from the design wave frequencies. This study presents novel perspectives and practical solutions within the realm of coastal protection engineering, offering valuable references for real-world engineering projects.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120089"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative critical ship arena based on collision accident reports to pre-warn close-quarters situations","authors":"Yaling Li ,&nbsp;Zhiyou Cheng ,&nbsp;Yihao Zhang ,&nbsp;Bing Wu ,&nbsp;C. Guedes Soares","doi":"10.1016/j.oceaneng.2025.120470","DOIUrl":"10.1016/j.oceaneng.2025.120470","url":null,"abstract":"<div><div>This paper proposes the quantitative Critical Ship Arena (C-SA) to pre-warn close-quarters situations using ship collision accident reports. The framework of the critical ship arena is developed based on the ship arena from the perspective of the collision avoidance actions and its geometric distribution around the own ship. The boundary of the C-SA is extracted based on its definition. The radii of the boundary of the C-SA are derived using statistical knowledge. The quantitative critical ship arena in traffic-intensive waters obtained from ship collision accident reports is verified by simulation experiments, which can pre-warn the close-quarters situation. The results show that the distribution of the critical ship arena under various own-ship lengths is similar and nearly oval, which is approximately semi-circular at the bearing of −90°–90° and elliptical at the bearing of 90°–270°. The proposed critical ship arena can pre-warn the close-quarters situation to prevent individual ship collisions and improve maritime traffic safety in different situations and waters, effectively supporting intelligent ship navigation.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120470"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of sea spray at various wave-course angles based on a speed-component towed SPH model","authors":"Daolei Wu ,&nbsp;Xu Bai ,&nbsp;Yingfei Zan ,&nbsp;Aimin Wang ,&nbsp;Zhongming Li","doi":"10.1016/j.oceaneng.2025.120479","DOIUrl":"10.1016/j.oceaneng.2025.120479","url":null,"abstract":"<div><div>The primary source of water contributing to ship icing is sea spray from the interaction between ships and waves, making its analysis crucial for predicting icing events. This paper presents a speed-component towed smoothed particle hydrodynamics (SPH) model designed to investigate sea spray characteristics during ship-wave interactions at various wave-to-course angles. This approach addresses the limitations of existing sea spray models, which often assume that ships navigate directly into head-on waves. The study involves SPH modeling of the ship DTMB5415, facilitating simulations to examine interactions that generate sea spray. A threshold for SPH particle velocity distinguishes between sea spray and green water. The numerical results are validated by comparing the sea spray distribution on a medium-sized fishing vessel (MFV). Additionally, the model’s reliability is verified by comparing the shape and generation of sea spray for DTMB5415 in oblique waves at 5° and 10° angles. Simulations exploring sea spray generation across various wave-to-course angles show that as the angle increases, potential energy expenditure during wave climbing decreases, while sea spray volume generated increases nearly linearly.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120479"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive analysis of flow-induced vibration and rotation characteristics of near-wall hydrofoil","authors":"Lin Ding ,&nbsp;Yiran Duan ,&nbsp;Xiangxi Mao ,&nbsp;Jingyu Ran","doi":"10.1016/j.oceaneng.2024.120085","DOIUrl":"10.1016/j.oceaneng.2024.120085","url":null,"abstract":"<div><div>This research delves into the flow-induced bending and torsional vibration characteristics of a near-wall hydrofoil. The analysis focuses on the impact of reduced velocity, wing-wall distance (<em>H</em>), and initial angle of attack (<em>α</em>_<em>0</em>) on the hydrofoil's bending and torsional vibration behavior. Findings reveal that at low reduced velocities (3≤<em>U∗</em>≤6), the bending-torsional vibration amplitude is minimal. The lift coefficient's standard deviation initially rises and then falls, mirroring the trend in bending amplitude. Within the range 8≤<em>U∗</em>≤12, a \"locked-in\" phenomenon between bending and torsion induces notable changes in vibration and lift-drag coefficient. The lock-in range broadens with increasing wing-wall distance for the flexible hydrofoil. Bending displacement and torsion angle increase with higher reduced velocities and larger wing-wall distances. At small initial angles of attack (<em>α</em>_<em>0</em> = 5°), bending and torsional amplitudes are nearly zero. However, at medium angles (<em>α</em>_<em>0</em> = 10°, <em>α</em>_<em>0</em> = 15°), pronounced vibrations occur within the locked range. Larger initial angles (<em>α</em>_<em>0</em> = 20°, <em>α</em>_<em>0</em> = 25°) show differing effects on bending and torsional amplitudes with velocity. Overall, the standard deviation of the lift coefficient decreases notably for the flexible hydrofoil, maintaining a stable lift-to-drag ratio. Nevertheless, within the locked frequency interval, both the lift coefficient's standard deviation and the time-averaged lift-to-drag ratio experience sharp increases.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120085"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sensor data based system identification and modular autopilot control instrumentation of marine craft","authors":"Ismail Bayezit ,&nbsp;Ahmad Irham Jambak ,&nbsp;Omer Kemal Kinaci ,&nbsp;Baris Fidan","doi":"10.1016/j.oceaneng.2024.119793","DOIUrl":"10.1016/j.oceaneng.2024.119793","url":null,"abstract":"<div><div>This research explores the transformation of non-autonomous leisure marine crafts using a novel modular autopilot control instrumentation. It focuses on leveraging sensor data-based models for understanding the motion dynamics of marine crafts and the strategic integration of PID controllers for heading angle control. The paper addresses the inherent challenges in the marine environment, presenting a comprehensive approach that includes the design, implementation, and validation in a real-world sea trial with the Beneteau Antares 780 Motorboat. The study demonstrates the system’s practical viability through testing on a Vehicle In the Loop setup, showcasing its efficiency and potential for enhancing recreational marine navigation.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 119793"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ship detection using GNSS Wave Buoy MGB-2","authors":"Mingwei Di ,&nbsp;Bofeng Guo ,&nbsp;Tianjun Zhang ,&nbsp;Zebei Hou ,&nbsp;Xingwang Yu ,&nbsp;Anmin Zhang","doi":"10.1016/j.oceaneng.2024.120066","DOIUrl":"10.1016/j.oceaneng.2024.120066","url":null,"abstract":"<div><div>GNSS wave buoys, traditionally used for measuring hydrological parameters such as tides and waves, can also function as ship detection sensors by analyzing their displacement data. Compared to remote sensing techniques, GNSS buoys offer the advantages of continuous observation and high sampling rates. In this research, we propose a novel ship detection method utilizing our independently developed GNSS wave buoy, the ”Multi-antenna GNSS Wave Buoy Generation 2 (MGB-2)”. This study begins by modeling ship wakes and analyzing their impact on wave buoys. Simulation results indicate that wave buoys can detect wake signals within specific frequency bands. Then we introduce the method employing wavelet transform of vertical displacement and the creation of a background field to detect passing ships. Experiments conducted on the Haihe River in Tianjin demonstrated successful detection in all seven observed ship passages. Additionally, by analyzing the buoy’s horizontal displacement, the method enables the determination of ship movement direction based on the propagation characteristics of ship wakes. Finally, to assess the method’s performance in marine environments, we simulated random sea conditions using the JONSWAP wave spectrum combined with the cosine-squared directional spreading function. The results indicate that the proposed method can effectively detect ship wakes even in complex wave conditions, highlighting the potential of GNSS buoys for ship detection in marine environments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120066"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OWP-LIO: A method and experimental study for pose measurement of offshore wind power O&M vessels using Lidar-Inertial odometry","authors":"Yu Deng ,&nbsp;Wenhan Zhang ,&nbsp;Weikang Li ,&nbsp;Songlin Zhou ,&nbsp;Xianchao Zhao ,&nbsp;Weixing Chen","doi":"10.1016/j.oceaneng.2024.120107","DOIUrl":"10.1016/j.oceaneng.2024.120107","url":null,"abstract":"<div><div>Accurate vessel positioning is crucial for operating and maintaining wind power access systems. This study explores Lidar-Inertial Odometry (LIO) as a cost-effective alternative to traditional, expensive IMUs. In offshore wind power operations and maintenance, traditional LIO faces challenges in gravity estimation during initialization and map updating due to vessel movement and limited motion range, complicating high-dynamic scenarios. To address these issues, we propose OWP-LIO, which integrates three components: preprocessing with plane reference gravity estimation for initialization, state estimation using IEKF, and real-time map updating. Experiments in offshore environments, using traditional IMU measurements as ground truth, show that OWP-LIO, using the plane reference gravity estimation method, achieves a 24.6% reduction in RMSE in the heave direction compared to conventional methods. Additionally, land-based ablation experiments simulating highly dynamic and short-range motion demonstrate that the real-time map update reduces point cloud map size by 38.8% and processing time per frame by 8.7%, leading to decreased system resource consumption. In offshore trials, in which traditional IMU data serves as the ground truth, OWP-LIO maintains RMSE within 1 cm in heave and 0.1° in roll and pitch, while reducing costs to 9.6% of traditional IMUs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120107"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094788","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}