Ocean Engineering最新文献_第3页

Hydrodynamic response of separated undulating fins based on numerical simulation and orthogonal experiment: Analysis and optimization of thrust influencing factors

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-02 DOI: 10.1016/j.oceaneng.2025.121094

Guanghao Li , Penglei Ma , Xin Fang , Gongbo Li , Guijie Liu , Xinyu Liu

{"title":"Hydrodynamic response of separated undulating fins based on numerical simulation and orthogonal experiment: Analysis and optimization of thrust influencing factors","authors":"Guanghao Li , Penglei Ma , Xin Fang , Gongbo Li , Guijie Liu , Xinyu Liu","doi":"10.1016/j.oceaneng.2025.121094","DOIUrl":"10.1016/j.oceaneng.2025.121094","url":null,"abstract":"<div><div>The purpose of this study is to investigate the factors influencing the thrust enhancement phenomenon in separated undulating fins and to elucidate the underlying mechanisms. Numerical simulations were employed to conduct an Orthogonal testal study on the thrust and thrust enhancement efficiency of separated undulating fins under the influence of multiple factors. The effects of variables such as oscillation angle, wave number, and phase on thrust enhancement were comprehensively analyzed. The results indicate that variations in the oscillation angle most significantly impact the thrust, showing a positive correlation between the two. In terms of thrust enhancement efficiency, changes in the wave number are particularly notable, displaying a negative correlation. Under optimal conditions, the thrust enhancement efficiency of the separated undulating fins reached 23.42 %. It is important to note that phase alterations primarily affect the instantaneous thrust enhancement efficiency, with minimal impact on the average thrust enhancement efficiency. Flow field analysis revealed that thrust enhancement is associated with the region influenced by vortices. As the wave number increases, this region decreases significantly. This study provides new insights into the enhancement of thrust by undulating fins.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121094"},"PeriodicalIF":4.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746504","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

DOA estimation of internal waves generated by fluctuating cylinder in stratified medium via array processing

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-02 DOI: 10.1016/j.oceaneng.2025.120959

Ehsan Davoodi , Hamed Deldar , Mohammad Maleki

{"title":"DOA estimation of internal waves generated by fluctuating cylinder in stratified medium via array processing","authors":"Ehsan Davoodi , Hamed Deldar , Mohammad Maleki","doi":"10.1016/j.oceaneng.2025.120959","DOIUrl":"10.1016/j.oceaneng.2025.120959","url":null,"abstract":"<div><div>The movement of an objective in a stratified medium such as oceans, generates internal waves that propagate with the specific directions. The frequency of the internal waves is very low (0.01–0.008 Hz) and they can spread over long distance (∼50 km). Also, direction-of-arrival (DOA) estimation refers to the process of retrieving the direction information of several electromagnetic waves/sources from the outputs of a number of receiving antennas that form a sensor array. In this theoretical-experimental study using DOA conception, the propagation direction of internal waves induced by a moving objective in a stratified medium is estimated. It can lead to detect moving targets inside of stratified mediums in a passive way with various applications. As a case study, a fluctuating cylinder in the stratified water is utilized to generate internal waves and as well as five fast response salinity sensors are used in a uniform linear array (ULA) arrangement to mine data. In current work, six well-known algorithms Bartlet, MUSIC, WMUSIC, DML, SML and WSF are used to DOA estimation of the generated internal wave. The comparative results show the proper performance of DOA estimation (for the direction of wave propagation) so that estimation errors are insignificant.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 120959"},"PeriodicalIF":4.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746506","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

Seakeeping analysis of an amphibious vessel using CFD-modified potential (CMP) simulation and experimental validation

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121045

Seol Nam , Jong-Chun Park , Jun-Bum Park , Hyeon Kyu Yoon , Momchil Terziev , Atilla Incecik

{"title":"Seakeeping analysis of an amphibious vessel using CFD-modified potential (CMP) simulation and experimental validation","authors":"Seol Nam , Jong-Chun Park , Jun-Bum Park , Hyeon Kyu Yoon , Momchil Terziev , Atilla Incecik","doi":"10.1016/j.oceaneng.2025.121045","DOIUrl":"10.1016/j.oceaneng.2025.121045","url":null,"abstract":"<div><div>This study introduces a hybrid simulation method, CFD-Modified Potential (CMP), that integrates Computational Fluid Dynamics (CFD) with potential flow methods to analyze the seakeeping performance of an amphibious vessel. The CMP procedure addresses the limitations of potential flow models, which are computationally efficient but neglect viscous effects, and CFD models, which are accurate but computationally intensive. By combining these approaches, CMP achieves both computational feasibility and enhanced accuracy. The method was used to predict roll and pitch damping ratios, derive Response Amplitude Operators (RAOs), and evaluate seakeeping performance. Results showed that CMP improved the accuracy of roll motion predictions in beam sea (90°) with errors below 5 % compared to experimental data. For pitch motion in head sea (120°–180°), significant improvements were observed when applying the CMP-derived damping ratio. Seakeeping performance predictions, particularly for roll motion, closely aligned with experimental results across all wave conditions, demonstrating CMP's reliability. While direct experimental data for pitch motion were unavailable, the method's robustness was validated through CFD-based comparisons. This study highlights CMP as a practical and reliable tool for accurate seakeeping performance assessments, minimizing the need for extensive experimental testing and supporting the design optimization of amphibious vessels.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121045"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746379","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

Shape parameterization method and hydrodynamic noise characteristics of low-noise toroidal propeller

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121088

Peng Liu , Shuaiqiang Li , Hui Jin , Xiaojie Tian , Guijie Liu

{"title":"Shape parameterization method and hydrodynamic noise characteristics of low-noise toroidal propeller","authors":"Peng Liu , Shuaiqiang Li , Hui Jin , Xiaojie Tian , Guijie Liu","doi":"10.1016/j.oceaneng.2025.121088","DOIUrl":"10.1016/j.oceaneng.2025.121088","url":null,"abstract":"<div><div>A toroidal propeller distributes a generated vortex on the whole propeller blade, effectively preventing vortex leakage from the tip of the propeller, which causes the vortex to dissipate quickly in the water and reduces the propagation of hydrodynamic noise. However, owing to their complex structure, modeling toroidal propellers via conventional propeller modeling methods is difficult. In this paper, a low-noise toroidal propeller shape parameterization method is proposed, and the hydrodynamic performance and non cavitation noise are compared with those of a DTMB P4119 propeller. The results show that the modeled toroidal propeller has more thrust than the DTMB P4119 propeller under the same rotational speed conditions. Under the same thrust conditions, the hydrodynamic noise of the modeled toroidal propeller is lower than that of the DTMB P4119 propeller; the total noise SPL at the radial measurement point is reduced by approximately 4 dB, and the total noise SPL at the axial measurement point is reduced by approximately 6 dB compared with that of the DTMB P4119 propeller. This novel toroidal propeller shape parameterization method provides a theoretical basis for suppressing the hydrodynamic noise of ships and underwater vehicles.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121088"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746381","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

Parametric dynamic modeling-based robust nonlinear model predictive control design for tracking unmanned surface vehicle trajectory

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121074

Siyuan Wang , Man Zhu , Yuanqiao Wen , Kang Tian

{"title":"Parametric dynamic modeling-based robust nonlinear model predictive control design for tracking unmanned surface vehicle trajectory","authors":"Siyuan Wang , Man Zhu , Yuanqiao Wen , Kang Tian","doi":"10.1016/j.oceaneng.2025.121074","DOIUrl":"10.1016/j.oceaneng.2025.121074","url":null,"abstract":"<div><div>This paper proposes a robust nonlinear model predictive control scheme based on parameter identification (EF-NMPC) for trajectory tracking control of unmanned surface vehicle (USV) under uncertain time-varying disturbances and actuator saturation. An extended Kalman filter (EKF)-based parameter identification method is employed to construct the maneuvering motion model of the USV, enhancing the accuracy of internal dynamic estimation. A novel nonlinear disturbance observer (FDO) is designed to estimate unknown disturbances and uncertainties affecting the system, and this observer is integrated into the predictive model to mitigate the impact of model inaccuracies on control performance. The Cybership II model ship is used as the simulation experiment object, with various operating conditions and trajectory tracking scenarios designed to test the tracking performance of the robust nonlinear model predictive control (NMPC) scheme based on parameter identification. Comparative simulations with EF-LMPC and other control schemes demonstrate that the proposed control scheme exhibits strong robustness, with lower average tracking error and faster error convergence speed compared to current mainstream control schemes, resulting in better tracking performance.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121074"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746383","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 high-frequency oscillating tensegrity robotic fish with wide-ranging online body stiffness adjustability

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121063

Fuhui Ding, Wenxiang Chen, Jiaze Zhang, Bingxing Chen

{"title":"A high-frequency oscillating tensegrity robotic fish with wide-ranging online body stiffness adjustability","authors":"Fuhui Ding, Wenxiang Chen, Jiaze Zhang, Bingxing Chen","doi":"10.1016/j.oceaneng.2025.121063","DOIUrl":"10.1016/j.oceaneng.2025.121063","url":null,"abstract":"<div><div>Body and/or caudal fin (BCF) fish mainly use their body and tail fin as propulsors, and tune their stiffness during swimming to enable rapid and efficient locomotion. However, current variable-stiffness biomimetic robotic fish with high-frequency actuation mainly focuses on the effect of tail fin stiffness. In this paper, we develop a free-swimming tensegrity robotic fish with multi-tensegrity joints, to experimentally study the effect of online body stiffness variation in fish-like swimming with high actuation frequency. We detail its remote high-frequency driving mechanism and fast stiffness adjustment system. We validate the wide-range and fast stiffness adjustment for the tensegrity joint. The robotic fish can dynamically alter various body stiffness distributions online by changing its joints’ stiffness. The experimental results illustrate the nonlinear and dramatic effects of the driving frequency, body stiffness, and swimming state. The ability to adjust body stiffness online in swimming is demonstrated, enabling large range and fast changes in swimming speed and thrust. Compared to other biomimetic robotic fish, the tensegrity robotic fish’s swimming performance is at an upper-middle level, and its variable stiffness ability is outstanding. This work offers valuable insights for the future optimization online of the swimming process in biomimetic fish design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121063"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746385","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

Gray-box identification for added power prediction in rough seas based on spectral analysis of model test results

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121106

Seungbeom Lee , Jeonghwa Seo , Dong-Hwan Kim , Jaehyung Park , Kwanwoo Kim , Sangmin Han , Mintae Kim , Sungwook Chung

引用次数: 0

Solgenia—A test vessel toward energy-efficient autonomous water taxi applications

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121011

Hannes Homburger , Stefan Wirtensohn , Patrick Hoher , Tim Baur , Dennis Griesser , Moritz Diehl , Johannes Reuter

{"title":"Solgenia—A test vessel toward energy-efficient autonomous water taxi applications","authors":"Hannes Homburger , Stefan Wirtensohn , Patrick Hoher , Tim Baur , Dennis Griesser , Moritz Diehl , Johannes Reuter","doi":"10.1016/j.oceaneng.2025.121011","DOIUrl":"10.1016/j.oceaneng.2025.121011","url":null,"abstract":"<div><div>Autonomous surface vessels are a promising building block of the future’s transport sector and are investigated by research groups worldwide. This paper presents a comprehensive and systematic overview of the autonomous research vessel <em>Solgenia</em> including the latest investigations and recently presented methods that contributed to the fields of autonomous systems, applied numerical optimization, nonlinear model predictive control, multi-extended-object-tracking, computer vision, and collision avoidance. These are considered to be the main components of autonomous water taxi applications. Autonomous water taxis have the potential to transform the traffic in cities close to the water into a more efficient, sustainable, and flexible future state. Regarding this transformation, the test platform <em>Solgenia</em> offers an opportunity to gain new insights by investigating novel methods in real-world experiments. An established test platform will strongly reduce the effort required for real-world experiments in the future.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121011"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746570","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

The free fall dynamics and the similarity criteria for gravity installed anchors in water

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121070

Haixiao Liu, Jiancai Gao, Jing Sun

{"title":"The free fall dynamics and the similarity criteria for gravity installed anchors in water","authors":"Haixiao Liu, Jiancai Gao, Jing Sun","doi":"10.1016/j.oceaneng.2025.121070","DOIUrl":"10.1016/j.oceaneng.2025.121070","url":null,"abstract":"<div><div>For reduced-scaled model experiments of the gravity installed anchor (GIA), it is of great significance to extrapolate the model results to the prototype, highlighting the importance of exploring the similarity criteria. In the present work, the approach of computational fluid dynamics (CFD) is utilized to calculate the drag forces at different velocities of three typical GIAs, including the finless, T98 and OMNI-Max anchors, with which the relation expressions between the drag force and the velocity are fitted. The whole free fall process of GIAs in water can then be analyzed, and an analytical framework of the similarity criteria can be constructed. The structured-meshes are utilized to simulate the free fall process of reduced-scaled anchors, through which the similarity criteria are validated. Two case studies are performed to demonstrate various applications of the similarity criteria. By utilizing the similarity criteria developed, the whole dynamic falling process of GIAs in water can be obtained, not only from the reduced-scaled model test to the prototype anchor or the model anchor with a different scale, but also from the prototype test to the model anchors with any scales. This makes it possible to fully utilize precious and infrequent measured data from either prototype or model tests, and enlarges the knowledge of free fall properties of GIAs with any scales.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121070"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746382","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

Efficient and lightweight deep learning model for enhanced ship detection in maritime surveillance

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121085

Ying Li, Siwen Wang

{"title":"Efficient and lightweight deep learning model for enhanced ship detection in maritime surveillance","authors":"Ying Li, Siwen Wang","doi":"10.1016/j.oceaneng.2025.121085","DOIUrl":"10.1016/j.oceaneng.2025.121085","url":null,"abstract":"<div><div>Accurate and real-time ship detection is crucial for maritime surveillance, enabling effective collision avoidance and route transportation planning. Existing detection methods struggle to balance real-time performance, accuracy, and parameter efficiency, especially in complex maritime environments. To address these challenges, we propose an enhanced lightweight YOLO-based model, named PMS-YOLO, for real-time ship detection. PMS-YOLO introduces a Partial Multi-Scale Feature Extraction (PMFE) module to improve feature extraction capabilities, a Multi-Branch Auxiliary FPN (MAFPN) to enhance feature fusion, and a Shared Convolution Detection Head (SCDH) to reduce computational complexity while maintaining detection precision. Experimental results on self-built and public ship detection datasets demonstrate that PMS-YOLO achieves an average detection accuracy of 81.4 % and 82.0 %, respectively, representing improvements of 1.75 % and 1.74 % over YOLOv8, while reducing the number of parameters by 29.74 % and lowering computational complexity by 12.5 %. The proposed model effectively balances lightweight design and high precision, enabling real-time ship detection and facilitating deployment on devices with limited resources. Our code is available at https://github.com/wsw1996/ship-detection-PMS-YOLO.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121085"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746384","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