{"title":"Global and structural hydroelastic analysis of a large container ship with forward speed using multi-module method","authors":"Yusong Ye, Jijiang Jiang, Shiyuan Zhang, Shixiao Fu, Zhiyuan Pan, Shaobo Wu","doi":"10.1016/j.joes.2026.01.007","DOIUrl":"10.1016/j.joes.2026.01.007","url":null,"abstract":"<div><div>For large container ships, their low structure stiffness caused by large main particulars and openings bring hydroelastic problems. The forward speed alters hydrodynamics encounter frequency and amplitude, inducing difficulties in global and structural analysis. Additionally, the local deformations, which are crucial in stress analysis, are difficult to be predicted by modal superposition method. To address these problems, this paper adopts the speed-dependent beam-connected discrete-modules (BCDM) method for frequency-domain hydroelastic analysis. In this method, the container ship is discretized into several rigid modules connected by a hull girder. The double body flow model is used to obtain multi-body hydrodynamic with speed effect, while the thin-walled beam model is used to derive hull girder stiffness. By coupling the multi-body hydrodynamic with hull girder stiffness, the hydroelastic equation is established. Finally, the pressure and inertial loads from each module are statically mapped onto the finite element model for stress analysis, including global and local deformations. The analysis process is applied to a 14,000 TEU container ship. The global response results are validated through a segmented ship model experiment. Furthermore, the effects of flexibility and speed are analyzed. The results indicate that, at service speed, the hydroelastic response of the sectional loads can be up to four times larger than quasi-static result. Local deformations contribute to increased stress at locations such as the bottom plate between transverse bulkheads and the hatch corners.The analysis method may provide an effective approach for integrated hydroelastic analysis and structural safety verification of large vessels in engineering application.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1179-1200"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance analysis of towed wave glider and dynamic stability study of towed body","authors":"Siyuan Ma, Xiujun Sun, Can Li, Hongqiang Sang","doi":"10.1016/j.joes.2025.12.016","DOIUrl":"10.1016/j.joes.2025.12.016","url":null,"abstract":"<div><div>This study integrates a wave glider with an underwater towed system, forming a towed wave glider configuration. The complete system was modeled in OrcaFlex to evaluate how the underwater towed system affects the wave glider's performance. To address stability challenges in underwater towed systems, an innovative S-shaped towing cable configuration was introduced. The effects of three key parameters - the force coefficient <span><math><msub><mi>K</mi><mi>F</mi></msub></math></span>, spacing coefficient <span><math><msub><mi>K</mi><mi>L</mi></msub></math></span>, and number of wave segments <span><math><mi>N</mi></math></span> on towed body stability were systematically examined. The results demonstrate that the S-shaped towing cable provides excellent vibration damping and disturbance reduction. Optimal towed body stability is achieved when <span><math><mrow><msub><mi>K</mi><mi>F</mi></msub><mo>=</mo><mn>5</mn></mrow></math></span> and <span><math><mrow><msub><mi>K</mi><mi>L</mi></msub><mo>=</mo><mn>2</mn><mo>∼</mo><mn>3.5</mn></mrow></math></span>. However, appropriate adjustment of wave segment number <span><math><mi>N</mi></math></span> is required when sea states change. Both tank tests and sea trials have confirmed the vibration-damping effectiveness of the S-shaped towing cable. The integration of wave gliders with underwater towed systems exhibits substantial potential to significantly broaden the application scope of these platforms in future ocean observation campaigns.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1107-1136"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental and numerical study on the effective length coefficient of pile legs under lateral soil resistance","authors":"Han Fang, Mingxuan Shi, Nianyi Ye, Hongxiang Xue","doi":"10.1016/j.joes.2026.02.004","DOIUrl":"10.1016/j.joes.2026.02.004","url":null,"abstract":"<div><div>Soil-structure interaction significantly affects the buckling behavior of partially embedded piles. This paper conducts the axial compressed experiments to investigate the effect of soil-structure interaction on the buckling behavior of pile. The results demonstrate that soil-provided lateral restraint effectively enhances the buckling resistance capacity of pile. Based on experimental results, a segmented soil spring stiffness model is proposed to quantify the soil resistance under different soil characteristics. By using the segmented model, the numerical simulations are employed to study the effective length coefficient (ELC) of pile with different coverage depth ratio (CDR), soil characteristics, and flexural stiffness. Results shows that ELCs decrease with the increase of CDR and soil resistance ratio factor (SRF). An apparent transition of buckling mode of pile occurs at the critical boundary where CDR is 0.15 or SRF is 20 MN/m<sup>4</sup>. ELC value will gradually converge when the CDR and SRF exceed this boundary. Conversely, the deterioration of buckling performance is accompanied by the increase of cross-sectional size of pile. Based on the parametric analysis, a simplified method is proposed for the rapid calculation of the ELC by considering the CDR, SRF, and cross-sections size.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1304-1321"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yihao Dong, Muhayy Ud Din, Francesco Lagala, Hailiang Kuang, Jianjun Sun, Siyuan Yang, Irfan Hussain, Shaoming He
{"title":"Drone carrier: An integrated unmanned surface vehicle for autonomous inspection and intervention in GNSS-denied maritime environment","authors":"Yihao Dong, Muhayy Ud Din, Francesco Lagala, Hailiang Kuang, Jianjun Sun, Siyuan Yang, Irfan Hussain, Shaoming He","doi":"10.1016/j.joes.2026.02.002","DOIUrl":"10.1016/j.joes.2026.02.002","url":null,"abstract":"<div><div>GNSS denial and interference increasingly challenge maritime robotics. While heterogeneous Unmanned Aerial Vehicles (UAVs) and Unmanned Surface Vehicles (USVs) teams are promising for inspection and intervention, open-sea non-cooperative docking and reliable deck landing on a moving platform remain difficult. This work addresses that gap with a fully electric, modular USV-based drone carrier that autonomously approaches, docks to, and services target vessels without Global Navigation Satellite System (GNSS). The system integrates on-shore camera handover, onboard gimbaled vision and Light Detection and Ranging (LiDAR), Ultra-Wide Band (UWB)+Extended Kalman Filter (EKF) localization, Quick Response (QR)-based terminal landing, and a thrust-vectoring docking controller within a unified Robot Operating System (ROS) architecture. In sea-state-3 trials, the carrier achieved offshore handover at <span><math><mo>≈</mo></math></span> <!--> <!-->200<!--> <!-->m (3<!--> <!-->km standoff), onboard vision lock to <span><math><mo>≈</mo></math></span> <!--> <!-->500<!--> <!-->m, LiDAR modeling within 200<!--> <!-->m, non-cooperative docking with <span><math><mo>≤</mo></math></span>1<!--> <!-->m error, and QR-assisted deck landings with <span><math><mo>≈</mo></math></span> <!--> <!-->20 cm accuracy. These results demonstrate robust closed-loop operation under GNSS denial and delineate the present envelope (rigid deck edge; sea state <span><math><mo>≤</mo></math></span>3), informing deployment for port security and offshore rescue and guiding future extensions to higher sea states and broader target geometries.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1271-1286"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Vortex evolution and acoustic characteristics of toroidal propellers","authors":"Zhenqi Li, Xiaojian Cao, Hongde Qin","doi":"10.1016/j.joes.2026.02.005","DOIUrl":"10.1016/j.joes.2026.02.005","url":null,"abstract":"<div><div>Toroidal propellers, distinguished by their closed-loop blade tip configuration, exhibit significant potential in propulsion systems; however, the underlying physical mechanisms governing the complex interplay between their wake dynamics and acoustic signatures remain poorly understood. This study employs integrated open-water tests, transient 2D-3C PIV measurements, and high-fidelity Large Eddy Simulation (LES) to elucidate the hydrodynamic performance, wake vortex evolution mechanisms, and acoustic characteristics of toroidal propellers across advance coefficients (<em>J</em> = 0–1.0). Key findings demonstrate that the closed-loop blade tip redistributes blade loading and vorticity along the annular surface, reducing radial jet momentum while enhancing thrust. However, premature dissipation and fragmentation of trailing vortex structures occur due to amplified vortex-vortex interactions via leap-frogging instability. Anechoic tank measurements reveal that increased blade pressure loading and distributed spot-like vortex structures intensify dipole and quadrupole sources, adversely affecting broadband and discrete noise suppression. This study has established the first experimental database for small-scale toroidal propellers, achieving quantitative analysis of transient wake structures and completing fluid-acoustic coupling computations. Thereby, it provides a certain data reference for the stealth design and energy efficiency optimization of underwater propellers.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1322-1346"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fating Yu, Zhe Tang, Wenlong Bao, Siyu Zhang, Jinshu Lu
{"title":"A novel 9-DOF coupling dynamic model for parafoil-assisted ship system","authors":"Fating Yu, Zhe Tang, Wenlong Bao, Siyu Zhang, Jinshu Lu","doi":"10.1016/j.joes.2026.01.010","DOIUrl":"10.1016/j.joes.2026.01.010","url":null,"abstract":"<div><div>The parafoil-assisted ship system can convert strong, stable, high-altitude wind energy into propulsion power. This paper clarifies the dynamic coupling strength relationships among the internal factors of the combined parafoil-ship system. Considering the pulling force of traction rope, the 6-DOF motion of the parafoil, and the 3-DOF motion of the ship, a 9-DOF dynamic model of the system is established based on the Newton-Euler laws. The fourth-order Runge-Kutta method is adopted to carry out simulation calculations for the full-phase process. According to the motion characteristics of the system, with the process divided into four stages for factor analysis. Results indicate that a faster extension velocity makes a smoother trajectory, quicker ascent, and increased pulling force and peak angle of attack, but prevents stable ascent if exceeding 3.5m/s. The parafoil’s height or the pulling force are unaffected by wind deflection angle during the ascent stage. In the ship acceleration stage, the parafoil’s height and pulling force decrease as the ship accelerates, reducing the assist force. In the wind-assisted stage, the parafoil stalls when the wind deflection angle exceeds 30°; smaller angles yield lower pulling force but better assistance. In the parafoil recovery stage, a faster retrieval speed of the traction rope results in a quicker descent of the parafoil, but it increases the angle of attack and airspeed, thereby requiring greater pulling force for parafoil recovery. The angle of attack stabilizes at 6.29° in the stable state of the parafoil. The findings inform the design of the parafoil-assisted ship system.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1228-1240"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bo Liu, Juan Shi, Hamed Karimian, Fei Wang, Shengnan Shi, Haochen Wang, Hui Liu, Youliang Chen
{"title":"RED-YOLO: A lightweight synergistic fusion framework with channel-efficient neck and multi-dimensional attention for underwater small object detection","authors":"Bo Liu, Juan Shi, Hamed Karimian, Fei Wang, Shengnan Shi, Haochen Wang, Hui Liu, Youliang Chen","doi":"10.1016/j.joes.2026.05.006","DOIUrl":"10.1016/j.joes.2026.05.006","url":null,"abstract":"<div><div>Accurate object recognition in the marine environment is critical for protecting biodiversity and ensuring the sustainable exploitation of ocean resources. While state-of-the-art techniques based on deep learning have demonstrated impressive accuracy, their high computational requirements prevent real-time deployment, particularly on resource-constrained platforms such as AUVs and ROVs. To overcome this limitation, we present RED-YOLO, a lightweight yet accurate model tailored for underwater vision. Firstly, we introduced an Efficient Multi-scale Attention (EMA) module into the backbone to strengthen multi-resolution feature extraction. In addition, the neck structure incorporates a Lightweight-RepGFPN design to simplify feature fusion while reducing redundant parameters. Finally, we replaced DCNV2 with DCNV4, which employs a scale, spatial, and task-aware attention mechanism to facilitate target localization. Our model outperforms other models with just 2.8 M parameters and 9.7 GFLOPs, achieving 87.3 % mAP on our comprehensive test dataset. We believe that RED-YOLO provides a promising solution for underwater object detection by striking a balance between computational efficiency and detection accuracy.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1379-1399"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jinah Kim, Taekyung Kim, Donghyun Park, Sungyeol Chang, Jinhoon Kim, Inho Kim, Kideok Do
{"title":"Morphodynamics-guided spatiotemporal network for modeling the morphological evolution of sand beaches in response to extreme storm events: alphaBeach-X","authors":"Jinah Kim, Taekyung Kim, Donghyun Park, Sungyeol Chang, Jinhoon Kim, Inho Kim, Kideok Do","doi":"10.1016/j.joes.2025.11.003","DOIUrl":"10.1016/j.joes.2025.11.003","url":null,"abstract":"<div><div>In this study, we propose <em>alpha</em>Beach-<em>X</em>, a morphodynamics-guided spatiotemporal deep neural network designed to model the morphological evolution of a sandy beach and its changes in response to extreme storm events. The model was developed through a knowledge transfer learning strategy, in which morphodynamics were pretrained using numerical simulation data and then fine-tuned using field survey data to improve accuracy. The training and test datasets are curated based on hydrodynamic energy conditions to reduce the data imbalance issues commonly associated with rare extreme events. To further improve prediction accuracy during such extreme events — especially given the non-periodic temporal resolution of the field survey data — a recursive autoregressive process is incorporated into the model. The proposed model was applied to Maengbang Beach, located on the east coast of South Korea, and demonstrated skillful predictability in modeling storm-induced morphological changes through an ensemble prediction. As assessed using the Brier skill score<!--> <!-->(BSS), <em>alpha</em>Beach-<em>X</em> outperformed previous studies, achieving improved accuracy in prediction pre- and post-storm morphological changes. Based on 49 bathymetric survey datasets collected over six years, and using a 70:30 training-to-testing data split, the proposed <em>alpha</em>Beach-<em>X</em> model demonstrates average morphological change prediction performance in the swash zone (above −5<!--> <!-->m relative to mean sea level) with a Root Mean Square Error of 0.63<!--> <!-->m, a Bias of 0.10<!--> <!-->m, a Structural Similarity Index Measure of 0.45, and a BSS of 0.52.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1057-1071"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An integrated solution for underwater image restoration in artificially lit turbid water","authors":"Tianchi Zhang, Yusong Li, Xing Liu, Mingjun Zhang","doi":"10.1016/j.joes.2026.02.003","DOIUrl":"10.1016/j.joes.2026.02.003","url":null,"abstract":"<div><div>This study addresses underwater image restoration in artificially lit low to medium turbid water for vision-based AUV target detection. We propose an integrated restoration framework founded on three key innovations: a bright channel-based method for robust depth estimation, a depth-aware approach for consistent background light estimation, and a background feature-based technique for transmittance estimation under unknown attenuation conditions. Compared to existing methods, the unified framework effectively mitigates depth-related errors, reduces color distortion, and operates without prior knowledge of optical parameters in turbid water. The proposed method is validated using both a private dataset and public benchmarks. Experimental results confirm that it significantly enhances image quality under challenging illumination, demonstrating strong practical value for underwater visual applications.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1287-1303"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ze Li, Ruiyan Gong, Jinhui Jiang, Yiting Wang, Lei Wang
{"title":"Velocity control of dynamic positioning vessel based on linear active disturbance rejection controller with environmental disturbance","authors":"Ze Li, Ruiyan Gong, Jinhui Jiang, Yiting Wang, Lei Wang","doi":"10.1016/j.joes.2025.12.003","DOIUrl":"10.1016/j.joes.2025.12.003","url":null,"abstract":"<div><div>The position keeping of a vessel typically can be accomplished through the implementation of a dynamic positioning (DP) system without specifically controlling the vessel velocity. However, in some offshore operations, the displacement and velocity-controlled may be required simultaneously. To address this issue, present study propose a velocity direct control strategy for a dynamic positioning (DP) vessel by applying Linear Active Disturbance Rejection Control (LADRC) facilitating the vessel to follow a designated trajectory at a specified velocity. Comparative analysis between conventional path tracking control strategy and proposed strategy was carried out utilizing time-domain simulations. The comparisons demonstrate that conventional tracking strategy cannot achieve high-accuracy path tracking and overshoot-free velocity control at the same time, while the proposed velocity direct control strategy can fulfill overshoot-free velocity control across the velocity step input with small offset. The numerical simulations of Z-shaped routes under environmental disturbances further confirm the effectiveness of the proposed method, particularly when it comes to trajectories with abrupt changes.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"11 4","pages":"Pages 1095-1106"},"PeriodicalIF":5.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148806849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}