Ocean Engineering最新文献_第3页

Performance characteristics of the Archimedes screw hydrokinetic turbine 阿基米德螺杆水力透平的性能特点

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.122062

Temitope E. Phillips , David H. Wood

{"title":"Performance characteristics of the Archimedes screw hydrokinetic turbine","authors":"Temitope E. Phillips , David H. Wood","doi":"10.1016/j.oceaneng.2025.122062","DOIUrl":"10.1016/j.oceaneng.2025.122062","url":null,"abstract":"<div><div>The Archimedes Screw hydrokinetic turbine (AST) is garnering considerable interest because of its potential applicability in harvesting river and tidal energy. The turbine is well suited to bi-directional flows, low-velocity flows, and shallow watercourses. Because the AST is a reasonably new hydro-technology, very little literature is available on its design and performance optimization. This study experimentally investigates the torque and power generation of the AST. Laboratory scale turbine models with one, two, and three flights (blades) were tested in a water tunnel to measure torque and angular velocity at different flow velocities and varying inclination angles (<span><math><mi>β</mi></math></span>) of the turbine. A maximum coefficient of performance (<span><math><msub><mi>C</mi><mi>P</mi></msub></math></span>) of 0.41 was obtained at a tip speed ratio (<span><math><mi>λ</mi></math></span>) of 0.52 at a flow velocity (<span><math><msub><mi>U</mi><mi>∞</mi></msub></math></span>) of 0.45 m/s and <span><math><mi>β</mi></math></span> = 30<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span> for a turbine with two flights. In the case of the 3-flight turbine, the highest value of <span><math><msub><mi>C</mi><mi>P</mi></msub></math></span> was also obtained at 30<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span> (0.40 at <span><math><mi>λ</mi></math></span> = 0.53). For the 1-flight turbine, a maximum <span><math><msub><mi>C</mi><mi>P</mi></msub></math></span> of 0.23 was obtained at a <span><math><mi>β</mi></math></span> of 28<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span> and <span><math><mi>λ</mi></math></span> of 0.30. The results also showed a time-varying fluctuation in the torque, which reduced in magnitude with an increase in number of flights. The ripple was found to occur once-per-revolution and not once-per-flight, irrespective of the number of flights.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122062"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535707","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

Towards intelligent energy management in hybrid ships: Predicting and optimizing solar, wind, and diesel energy 迈向混合动力船舶的智能能源管理：预测和优化太阳能、风能和柴油能源

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.122092

Qi Zhang , Chunteng Bao , Pengfei Han

{"title":"Towards intelligent energy management in hybrid ships: Predicting and optimizing solar, wind, and diesel energy","authors":"Qi Zhang , Chunteng Bao , Pengfei Han","doi":"10.1016/j.oceaneng.2025.122092","DOIUrl":"10.1016/j.oceaneng.2025.122092","url":null,"abstract":"<div><div>With the continuous growth of global energy demand and the increasing concern over carbon emissions, hybrid vessels have become a promising solution for reducing the environmental impact of maritime transportation. However, the effective management of ship energy, especially the optimal utilization of renewable energy sources such as wind and solar power, as well as the operation of diesel engines, remains an unresolved challenge. This study proposes a comprehensive framework that utilizes neural network models and the integrated technology of evolutionary multi-task optimization (NN-EMTO-A) to predict and optimize the energy usage of hybrid vessels, with a focus on the real-time operating conditions during maritime navigation. The proposed method combines key environmental factors - cloud cover, wind speed, temperature, wind direction of solar energy and the position of ships predicted by wind energy - as well as the efficiency of diesel engines over time. By inputting these variables into NN-EMTO-A, the system predicts the most efficient energy usage of hybrid ships. The experimental results show that NN-EMTO-A can accurately predict energy output and adaptively select the optimal energy according to different sea conditions. Meanwhile, the efficiency level of the energy storage system is 97.82 %, and the comprehensive efficiency is 76.52 %. Within the predicted range, the predicted efficiency of wind energy reaches 92.43 %, This research provides a novel and promising solution for improving the energy efficiency of hybrid ships, which is of great significance for sustainable Marine energy management.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122092"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535705","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

Straightened velocity obstacle algorithm for inland ships collision avoidance 内河船舶避碰的直线速度障碍算法

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.121935

Zhi'ang Wang , Yamin Huang , Linying Chen , Liang Huang , Yuanqiao Wen

{"title":"Straightened velocity obstacle algorithm for inland ships collision avoidance","authors":"Zhi'ang Wang , Yamin Huang , Linying Chen , Liang Huang , Yuanqiao Wen","doi":"10.1016/j.oceaneng.2025.121935","DOIUrl":"10.1016/j.oceaneng.2025.121935","url":null,"abstract":"<div><div>With the advancement of artificial intelligence, inland Maritime Autonomous Surface Ships (MASS) are gaining traction. While various algorithms exist for collision avoidance, many assumptions from open waters, such as constant speed and course, do not apply to inland waterways. Ships in these environments are constrained by riverbanks, making traditional methods like DCPA/TCPA-based risk evaluation and the Linear Velocity Obstacle (LVO)algorithm ineffective. To address this issue, we propose a Straightened Velocity Obstacle (SVO) algorithm for collision avoidance in inland waters. This algorithm is based on the observation that ships maintain a relatively constant distance from the riverbank or the channel's centerline. Unlike traditional methods that use geodetic coordinates, the SVO algorithm sets the channel's centerline as the y-axis and the distance to it as the x-axis, effectively straightening the meandering channel for better collision detection in Decision Space (DS). Simulations using traffic data from inland waters validate the proposed algorithm. Scenarios involving heading and overtaking in curved channels demonstrate that the SVO algorithm outperforms traditional LVO and CPA-based methods, demonstrating its effectiveness for MASS in constrained inland environments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 121935"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535702","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 into heading stability of turret-moored vessels in regular waves 规则波条件下炮塔系泊船舶航向稳定性研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.122037

Yongjun Yu , Yaliu Liu , Zhengxin Huang , Yu Liang , Liqin Liu

{"title":"Investigation into heading stability of turret-moored vessels in regular waves","authors":"Yongjun Yu , Yaliu Liu , Zhengxin Huang , Yu Liang , Liqin Liu","doi":"10.1016/j.oceaneng.2025.122037","DOIUrl":"10.1016/j.oceaneng.2025.122037","url":null,"abstract":"<div><div>In practical marine engineering, single-point mooring (SPM) vessels under heading regular wave excitation manifest sustained and large-amplitude slow yaw motions. To clarify the essential mechanisms, this work employs the nonlinear dynamics method to investigate the bifurcation characteristics and stability of the system. Firstly, the phenomenon of yaw instability was observed in experiments. Then, the surge-sway-yaw horizontal motion equations were established, linear stability analysis was conducted, and the stability criterion was obtained. Comparison with experimental and numerical results demonstrates great agreement. Subsequently, critical parameters, including turret position and pitch damping, are selected to analyze the bifurcation characteristics and evaluate the yaw stability region. The results show that wave frequency, turret position, pitch damping, and load condition affect equilibrium heading angle and yaw stability pronouncedly. In contrast, wave height and mooring stiffness demonstrate negligible impact on equilibria and yaw static stability. It is concluded that yaw instability under regular waves manifests as a transition process where the SPM system shifts from its zero equilibrium point to a non-zero equilibrium state, indicating a loss of static stability. The qualitative analysis of system parameters presented in this paper could offer practical guidance for the preliminary design stage of SPM vessels, particularly in optimizing turret positioning, load condition, and metocean conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122037"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the ultimate strength of box-type hull girders subjected to extreme cyclic bending moments 极限循环弯矩作用下箱式船体梁极限强度试验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.122044

Kang Hu , Fangji Zhang , Renjie Xu , Huwei Cui , Ping Yang

{"title":"Experimental study on the ultimate strength of box-type hull girders subjected to extreme cyclic bending moments","authors":"Kang Hu , Fangji Zhang , Renjie Xu , Huwei Cui , Ping Yang","doi":"10.1016/j.oceaneng.2025.122044","DOIUrl":"10.1016/j.oceaneng.2025.122044","url":null,"abstract":"<div><div>The purpose of this paper is to gain insight into the failure mechanism and ultimate strength behavior of ship hull girder subjected to cyclic bending moments. To this end, experimental study and numerical simulation were performed to investigate the ultimate strength behavior of ship hull girder under cyclic bending, and to analyze the attenuation law of ultimate strength considering the cumulative plasticity and crack propagation in the cracked hull girder. Firstly, a simplified box-type hull girder is selected as the research target and a set of test fixtures is innovatively designed for the ultimate strength assessment of box-type hull girders under bi-directional cyclic bending. Then, six test models including a cracked model are designed and fabricated to make clear the relationship between the ultimate bending moment and the constant/variable amplitude of curvature as well as the number of cycles; and the corresponding relation curves are drawn. Based on test data and simulation results, the rationality and accuracy of numerical simulation are validated by error analysis. Finally, a few new insights are revealed so as to provide a feasible solution for the numerical simulation and experimental investigation on the ultimate strength behavior of hull girder in rough sea conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122044"},"PeriodicalIF":4.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549419","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 three-dimensional hybrid model for predicting underwater noise from impact pile driving 冲击桩水下噪声的三维混合预测模型

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-03 DOI: 10.1016/j.oceaneng.2025.122080

Jiarui Xie , Fuqiang Niu , Ruichao Xue , Jian Guo

引用次数: 0

Bayesian deep learning based semantic segmentation for unmanned surface vehicles in uncertain marine environments 基于贝叶斯深度学习的不确定海洋环境下无人水面航行器语义分割

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-02 DOI: 10.1016/j.oceaneng.2025.122065

Zehao Ye , Yanhong Huang , Peng Wu , Yuanchang Liu

{"title":"Bayesian deep learning based semantic segmentation for unmanned surface vehicles in uncertain marine environments","authors":"Zehao Ye , Yanhong Huang , Peng Wu , Yuanchang Liu","doi":"10.1016/j.oceaneng.2025.122065","DOIUrl":"10.1016/j.oceaneng.2025.122065","url":null,"abstract":"<div><div>Unmanned Surface Vehicles (USVs) face challenges in complex marine environments due to the diversity and unpredictability of obstacles. These challenges are exacerbated by the limited availability of marine semantic segmentation datasets. To address these issues, this work aims to investigate the potential of a Bayesian deep learning-based semantic segmentation approach to improve obstacle recognition and uncertainty estimation. Specifically, Bayesian SegNet is employed to better handle uncertainties arising from environmental changes and model parameters. By estimating uncertainties, USVs can navigate and avoid obstacles more effectively, even in novel environments. Given the scarcity of USV-specific datasets, a stepwise learning strategy is implemented, where training is conducted on the MaSTr1325 dataset, and testing is performed using both the MaSTr1325 and OASIs datasets. This strategy enhances the model’s ability to generalise to real-world scenarios. Experimental results demonstrate that Bayesian SegNet significantly outperforms non-Bayesian models, achieving a 1.3 % increase in precision and a 6.5 % improvement in <span><math><mrow><mi>F</mi><mn>1</mn></mrow></math></span> score in marine environments. Additionally, Bayesian SegNet exhibits superior uncertainty estimation and generalisation capabilities, with a notable 39.77 % higher <span><math><mrow><mi>F</mi><mn>1</mn></mrow></math></span> score on the OASIs dataset compared to traditional SegNet, highlighting its effectiveness in improving semantic segmentation accuracy in USV navigation tasks.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122065"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523785","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

Investigations and applications of carbon control technology: The roadmap to zero-carbon shipping 碳控制技术的研究和应用：零碳航运的路线图

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-02 DOI: 10.1016/j.oceaneng.2025.121898

Kai Wang , Hongzhi Liang , Xing Liu , Zhongwei Li , Zesheng Jing , Yanpo Chi , Ranqi Ma , Jianlin Cao , Lianzhong Huang

{"title":"Investigations and applications of carbon control technology: The roadmap to zero-carbon shipping","authors":"Kai Wang , Hongzhi Liang , Xing Liu , Zhongwei Li , Zesheng Jing , Yanpo Chi , Ranqi Ma , Jianlin Cao , Lianzhong Huang","doi":"10.1016/j.oceaneng.2025.121898","DOIUrl":"10.1016/j.oceaneng.2025.121898","url":null,"abstract":"<div><div>With the increasingly stringent carbon emission regulations issued by International Maritime Organization (IMO), ship carbon emissions have attracted increasing attention. The ship carbon control regulations are first comprehensively analyzed. On this basis, the monitoring and analysis technology of ship carbon emissions is introduced. Then, the research status of ship carbon control technology from the short, medium and long-term points of view is systematically reviewed. The shortcomings and challenges of the ship carbon control technology are summarized, and the future development trends are summarized and prospected. The comprehensive analysis results show that the short-term carbon control technologies can reduce ship carbon emissions through operational measures and optimization measures, but it is rather hard to meet medium and long-term goals of carbon control. The medium-term carbon control technologies, including methanol fuel and biofuels, could further reduce ship carbon emissions, but they still cannot achieve zero-carbon emissions. In order to realize the long-term carbon emission control goal, the long-term carbon control technologies, including ammonia fuel and carbon capture technology, should be adopted to achieve the truly green shipping industry.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 121898"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523786","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

Integrated topology and power distribution optimization for the shipboard hybrid energy storage system via genetic algorithms and dynamic programming 基于遗传算法和动态规划的舰载混合储能系统拓扑和配电综合优化

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-02 DOI: 10.1016/j.oceaneng.2025.122095

Soon Ho Hong , Su Bin Choi , Min Young Jang , Sun Je Kim

{"title":"Integrated topology and power distribution optimization for the shipboard hybrid energy storage system via genetic algorithms and dynamic programming","authors":"Soon Ho Hong , Su Bin Choi , Min Young Jang , Sun Je Kim","doi":"10.1016/j.oceaneng.2025.122095","DOIUrl":"10.1016/j.oceaneng.2025.122095","url":null,"abstract":"<div><div>Recently, the shipping industry has accelerated the transition to electrified propulsion systems to improve fuel efficiency in response to strengthening environmental regulations. Ships experience nonlinear variations in power demand due to propulsion and hotel loads from onboard accommodations and equipment. To effectively manage fluctuating loads, it is essential to design propulsion systems integrated with Energy Storage Systems (ESS). However, ships have a larger physical scale than other mobility systems, single battery-based ESS is not sufficient to respond to changing loads. Accordingly, it is necessary to configure a hybrid energy storage system (HESS) that combines energy storage devices with different characteristics to secure optimal performance and reliability. This study proposes an efficient configuration and integrated power topology optimization method for HESS. To achieve this, a genetic algorithm (GA)-based sizing optimization and a dynamic programming (DP)-based load distribution optimization are applied. The results showed a 64 % reduction in weight and a 19 % reduction in energy loss through optimized battery-flywheel coordination. The optimization methodology of this study contributes to maximizing energy and operational efficiency and also improving lifespan of ESS and system stability of hybrid electric ship for various ship types.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122095"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524000","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

Characteristics of bulk wave run-up on shoreface-nourished beach 滩面滋养下的体波爬升特性

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-02 DOI: 10.1016/j.oceaneng.2025.122040

Yuan Li , Shubin Chen , Jiatao Cai , Shaohua Zhao , Fan Yu , Hongshuai Qi , Chi Zhang

{"title":"Characteristics of bulk wave run-up on shoreface-nourished beach","authors":"Yuan Li , Shubin Chen , Jiatao Cai , Shaohua Zhao , Fan Yu , Hongshuai Qi , Chi Zhang","doi":"10.1016/j.oceaneng.2025.122040","DOIUrl":"10.1016/j.oceaneng.2025.122040","url":null,"abstract":"<div><div>This study investigates wave run-up behaviour on nourished beaches with an artificial sandbar through a combination of physical experiments and phase-resolving numerical model SWASH. The research focuses on the dynamic interactions between wave run-up and morphological changes of the nourished beach. Results show that the presence of an artificial sandbar does not always reduce wave run-up. Under specific storm wave conditions, run-up energy on the nourished beach can exceed that on the natural (undisturbed) beach, particularly in low- and mid-frequency bands. This is attributed to wave energy shifting toward lower frequencies and resonances between the artificial sandbar and shoreline, as confirmed by first-order resonant frequency estimations. Temporal analysis of frequency components reveals that variations in crest water depth and seaward slope of the artificial sandbar significantly modulate total, low-, and high-frequency run-up, although high-frequency swash remains dominant throughout the morphological evolution. Existing empirical parameterizations for wave run-up, primarily developed for natural beaches, were evaluated against model results. While reasonable agreements are achieved, they tend to overlook the effects of submerged features and the saturation behaviour of run-up under specific conditions. The run-up prediction accuracy is improved by incorporating the dimensionless crest water depth in the modified formula, demonstrating its potential use for fast predictions of wave run-up on evolving nourished beaches.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122040"},"PeriodicalIF":4.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524001","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