Pub Date : 2025-01-01Epub Date: 2025-08-05DOI: 10.1016/j.ijnaoe.2025.100677
Byung-Hwa Song , Bon-Yeong Park , Dong-Kun Lee
This study examines the feasibility of gross tonnage (GT) measurement using 3D point cloud technology as a digital alternative to traditional manual methods. While ships over 24 m follow standardized regulations under the 1969 Tonnage Measurement Convention (TMC), those under 24 m are subject to diverse national rules, often based on simplified formulas. In this study, 3D point clouds were acquired using laser scanners for two Korean vessels—a government-owned ship over 24 m and a fishing vessel under 24 m. After post-processing, the enclosed volume was estimated using a convex hull algorithm and compared with GT values calculated under national standards. The point cloud-based method showed minimal variation, with a maximum difference of 0.30 % in volume and 0.23 TON in GT. These results indicate that 3D scanning provides a reliable and accurate alternative for GT measurement and offers potential for broader institutional adoption through standardized digital workflows.
{"title":"A case study on the introduction of an advanced ship inspection method: Gross tonnage measurement 3D point clouds","authors":"Byung-Hwa Song , Bon-Yeong Park , Dong-Kun Lee","doi":"10.1016/j.ijnaoe.2025.100677","DOIUrl":"10.1016/j.ijnaoe.2025.100677","url":null,"abstract":"<div><div>This study examines the feasibility of gross tonnage (GT) measurement using 3D point cloud technology as a digital alternative to traditional manual methods. While ships over 24 m follow standardized regulations under the 1969 Tonnage Measurement Convention (TMC), those under 24 m are subject to diverse national rules, often based on simplified formulas. In this study, 3D point clouds were acquired using laser scanners for two Korean vessels—a government-owned ship over 24 m and a fishing vessel under 24 m. After post-processing, the enclosed volume was estimated using a convex hull algorithm and compared with GT values calculated under national standards. The point cloud-based method showed minimal variation, with a maximum difference of 0.30 % in volume and 0.23 TON in GT. These results indicate that 3D scanning provides a reliable and accurate alternative for GT measurement and offers potential for broader institutional adoption through standardized digital workflows.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100677"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-05-09DOI: 10.1016/j.ijnaoe.2025.100661
Jingjing Wu, Qichang He
The layout of pipeline supports (LPS) is essential for ensuring the safety of pipeline, which prioritize safety while considering spatial arrangement, pipeline characteristics, and technical constraints. Due to the complexity of the design process, there has been a long-term reliance on manual design, resulting in significant efficiency bottlenecks in the design phase. The research introduces a design framework for LPS based on sequential generation. Initially, a feature vector is defined by focusing on the significant design factors. Subsequently, a knowledge-driven variable-step-size sampling method introduces to optimize efficiency without compromising effectiveness. Then, the sampling sequence is processed through a Multi-Heads-Attention based Encoder (MHA-Encoder) to predict labels for each point in the sequence, which indicating the support type and its index signifying the placement. Finally, the proposed method’s validity was confirmed via real-world design cases, demonstrating an accuracy of 91.55% with minimal errors and a 40-fold reduction in the design cycle.
管道支架的布置是保证管道安全的关键，在考虑管道空间布置、管道特性和技术约束的前提下，将安全放在首位。由于设计过程的复杂性，长期依赖人工设计，导致设计阶段的效率瓶颈显著。介绍了一种基于顺序生成的LPS设计框架。最初，特征向量是通过关注重要的设计因素来定义的。随后，引入知识驱动的变步长采样方法，在不影响效率的前提下优化效率。然后，通过基于多头注意的编码器（Multi-Heads-Attention - based Encoder, MHA-Encoder）对采样序列进行处理，预测序列中每个点的标签，这些标签表示支持类型，其索引表示放置位置。最后，通过实际设计案例验证了该方法的有效性，其精度为91.55%，误差最小，设计周期缩短了40倍。
{"title":"A sequential-generation-based intelligent method for layout of pipeline supports","authors":"Jingjing Wu, Qichang He","doi":"10.1016/j.ijnaoe.2025.100661","DOIUrl":"10.1016/j.ijnaoe.2025.100661","url":null,"abstract":"<div><div>The layout of pipeline supports (LPS) is essential for ensuring the safety of pipeline, which prioritize safety while considering spatial arrangement, pipeline characteristics, and technical constraints. Due to the complexity of the design process, there has been a long-term reliance on manual design, resulting in significant efficiency bottlenecks in the design phase. The research introduces a design framework for LPS based on sequential generation. Initially, a feature vector is defined by focusing on the significant design factors. Subsequently, a knowledge-driven variable-step-size sampling method introduces to optimize efficiency without compromising effectiveness. Then, the sampling sequence is processed through a Multi-Heads-Attention based Encoder (MHA-Encoder) to predict labels for each point in the sequence, which indicating the support type and its index signifying the placement. Finally, the proposed method’s validity was confirmed via real-world design cases, demonstrating an accuracy of 91.55% with minimal errors and a 40-fold reduction in the design cycle.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100661"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-11-07DOI: 10.1016/j.ijnaoe.2025.100701
Yongchul Lee , Taegoo Lee , Ji-Woo Hong , Byoung-Kwon Ahn , Kyungjun Lee , Donghyun Lee
Propeller cavitation is a highly complex phenomenon involving multiphase flow structures. Detailed observation of cavity behavior in localized regions is essential for safe and efficient propeller design. Partial blade models allow for focused investigation of specific blade angles and operating conditions, with a relatively larger observation frame than conventional cavitation tunnel tests. This study investigates the tip vortex flow characteristics of a full-scale propeller using two stationary partial blade models with different section shapes and cambers. The experiments were conducted under operating conditions corresponding to ship speeds of 16–18 knots and cavitation numbers ranging from 0.51 to 0.36. Several important physical phenomena were observed, such as the collapse of cavitation bubbles triggered by re-entrant flow and the complex interactions between primary and secondary vortex cavities. In particular, the high-speed imaging analysis clearly visualizes the collapse process of cavitation bubbles caused by the re-entrant flow in the blade tip region. The analysis showed that, at a cavitation number of 0.42, the two models exhibited a difference of approximately 28 %. The study identifies the formation of primary and secondary vortex cavities, clarifies the process by which they interact and grow together, and provides insight into how the adverse effects of tip vortex cavitation can be effectively mitigated.
{"title":"Experimental investigation of tip vortex cavitation using a stationary partial propeller blade model","authors":"Yongchul Lee , Taegoo Lee , Ji-Woo Hong , Byoung-Kwon Ahn , Kyungjun Lee , Donghyun Lee","doi":"10.1016/j.ijnaoe.2025.100701","DOIUrl":"10.1016/j.ijnaoe.2025.100701","url":null,"abstract":"<div><div>Propeller cavitation is a highly complex phenomenon involving multiphase flow structures. Detailed observation of cavity behavior in localized regions is essential for safe and efficient propeller design. Partial blade models allow for focused investigation of specific blade angles and operating conditions, with a relatively larger observation frame than conventional cavitation tunnel tests. This study investigates the tip vortex flow characteristics of a full-scale propeller using two stationary partial blade models with different section shapes and cambers. The experiments were conducted under operating conditions corresponding to ship speeds of 16–18 knots and cavitation numbers ranging from 0.51 to 0.36. Several important physical phenomena were observed, such as the collapse of cavitation bubbles triggered by re-entrant flow and the complex interactions between primary and secondary vortex cavities. In particular, the high-speed imaging analysis clearly visualizes the collapse process of cavitation bubbles caused by the re-entrant flow in the blade tip region. The analysis showed that, at a cavitation number of 0.42, the two models exhibited a difference of approximately 28 %. The study identifies the formation of primary and secondary vortex cavities, clarifies the process by which they interact and grow together, and provides insight into how the adverse effects of tip vortex cavitation can be effectively mitigated.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100701"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145568262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-03-15DOI: 10.1016/j.ijnaoe.2025.100653
SeongMo Yeon, Chang Seop Kwon, Yoo-Chul Kim, Kwang Soo Kim, Yeon Gyu Kim, Yun Ho Kim, Hee Jin Kang
The study investigated a Flettner rotor performance on a hull, analyzing design modifications and wind profiles for a small catamaran which designed by KRISO for the K-Energy Observer platform was analyzed. The rotor mounted on the hull showed a nearly 48% performance degradation in lift coefficient compared to the standalone rotor due to the disturbed flow by the hull at spin ratios 3–4. Two design factors were examined to improve performance: foundation shape and bottom configuration of the rotor. A square foundation shape showed relatively better improvement but it was not significant. On the other hand, it was found that the rotating end plate significantly improved thrust, achieving up to 80% of the standalone rotor’s performance. Comparing uniform and Norwegian Petroleum Directorate (NPD) wind profiles, the NPD profile showed a 12% improvement due to stronger winds at the rotor’s upper section. The study also compared performance under different wind directions and it showed a 20% increase at 30° and 18% at 60° for the original configuration. In contrast, the rotating end plate configuration showed a 6% decrease at 30° but a 10% increase at 60°. However, overall performance improvement was observed in the rotating end plate configuration with increases of 12%, 34%, and 44% for 30°, 60° and 90° compared to the original configuration. Additionally, under a 5° inclined hull condition, performance decreased by 21% for the original configuration but only 13% for the rotating end plate configuration, which highlighted the design’s effectiveness in mitigating performance loss.
{"title":"Performance analysis of Flettner rotor considering Marine wind profile and ship installation using CFD","authors":"SeongMo Yeon, Chang Seop Kwon, Yoo-Chul Kim, Kwang Soo Kim, Yeon Gyu Kim, Yun Ho Kim, Hee Jin Kang","doi":"10.1016/j.ijnaoe.2025.100653","DOIUrl":"10.1016/j.ijnaoe.2025.100653","url":null,"abstract":"<div><div>The study investigated a Flettner rotor performance on a hull, analyzing design modifications and wind profiles for a small catamaran which designed by KRISO for the K-Energy Observer platform was analyzed. The rotor mounted on the hull showed a nearly 48% performance degradation in lift coefficient compared to the standalone rotor due to the disturbed flow by the hull at spin ratios 3–4. Two design factors were examined to improve performance: foundation shape and bottom configuration of the rotor. A square foundation shape showed relatively better improvement but it was not significant. On the other hand, it was found that the rotating end plate significantly improved thrust, achieving up to 80% of the standalone rotor’s performance. Comparing uniform and Norwegian Petroleum Directorate (NPD) wind profiles, the NPD profile showed a 12% improvement due to stronger winds at the rotor’s upper section. The study also compared performance under different wind directions and it showed a 20% increase at 30° and 18% at 60° for the original configuration. In contrast, the rotating end plate configuration showed a 6% decrease at 30° but a 10% increase at 60°. However, overall performance improvement was observed in the rotating end plate configuration with increases of 12%, 34%, and 44% for 30°, 60° and 90° compared to the original configuration. Additionally, under a 5° inclined hull condition, performance decreased by 21% for the original configuration but only 13% for the rotating end plate configuration, which highlighted the design’s effectiveness in mitigating performance loss.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100653"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-10-04DOI: 10.1016/j.ijnaoe.2025.100696
In-Su Han , Myung-Il Roh , Min-Chul Kong
The P&ID (Piping and Instrumentation Diagram) is an essential drawing used to understand the structure and interconnections of systems within a ship. It serves a critical role throughout the entire lifecycle, from design to maintenance. However, because P&IDs express complex engineering information using simplified symbols, lines, and text, manual interpretation is typically required, which poses challenges such as high expertise demands, time consumption, and inconsistency depending on the individual engineer's interpretation. In this study, we proposed a method for automatically analyzing the interconnections between equipment and piping from P&IDs in both image and DXF (Drawing eXchange Format) formats, considering the distinct characteristics and limitations of each format, and converting them into a normalized graph structure. First, deep learning-based object detection was applied to image-formatted P&IDs to automatically detect various symbols and extract their classes and position information. Among the models tested, Cascade R-CNN demonstrated the best detection performance. Subsequently, entities such as lines and text were extracted from DXF-formatted P&IDs, and algorithms were developed to filter out significant lines and automatically determine branch relationships. Finally, the key components extracted from the P&ID were defined as nodes, and the interconnections between them were defined as edges to form a structured graph. Experimental results using test P&IDs confirmed that the proposed method could accurately identify interconnections and convert them into a structured graph even in environments that reflect real-world drawing conventions. As a result, the proposed method significantly improves upon the previously manual and repetitive interpretation process. It establishes a foundation for utilizing structured graph data in a wide range of future design and operational support applications by converting P&ID information into digital and normalized data.
{"title":"An automated method for converting P&IDs in shipbuilding to structured graphs","authors":"In-Su Han , Myung-Il Roh , Min-Chul Kong","doi":"10.1016/j.ijnaoe.2025.100696","DOIUrl":"10.1016/j.ijnaoe.2025.100696","url":null,"abstract":"<div><div>The P&ID (Piping and Instrumentation Diagram) is an essential drawing used to understand the structure and interconnections of systems within a ship. It serves a critical role throughout the entire lifecycle, from design to maintenance. However, because P&IDs express complex engineering information using simplified symbols, lines, and text, manual interpretation is typically required, which poses challenges such as high expertise demands, time consumption, and inconsistency depending on the individual engineer's interpretation. In this study, we proposed a method for automatically analyzing the interconnections between equipment and piping from P&IDs in both image and DXF (Drawing eXchange Format) formats, considering the distinct characteristics and limitations of each format, and converting them into a normalized graph structure. First, deep learning-based object detection was applied to image-formatted P&IDs to automatically detect various symbols and extract their classes and position information. Among the models tested, Cascade R-CNN demonstrated the best detection performance. Subsequently, entities such as lines and text were extracted from DXF-formatted P&IDs, and algorithms were developed to filter out significant lines and automatically determine branch relationships. Finally, the key components extracted from the P&ID were defined as nodes, and the interconnections between them were defined as edges to form a structured graph. Experimental results using test P&IDs confirmed that the proposed method could accurately identify interconnections and convert them into a structured graph even in environments that reflect real-world drawing conventions. As a result, the proposed method significantly improves upon the previously manual and repetitive interpretation process. It establishes a foundation for utilizing structured graph data in a wide range of future design and operational support applications by converting P&ID information into digital and normalized data.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100696"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145358278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-08-14DOI: 10.1016/j.ijnaoe.2025.100685
Hyeon-Su Kim , Dong-Hyun Moon , Dong-Ju Lee , Myung-Hyun Kim
Highly skewed propellers (HSPs), with skew angles over 25 degrees, are widely used to improve propulsion efficiency and reduce noise. However, their unique geometry can negatively impact fatigue performance, especially in nickel-aluminum-bronze (NAB) blades prone to casting flaws. This study re-evaluated current quality control standards, focusing on the risk of thermal embrittlement from post-weld heat treatment (PWHT), which may lower fatigue resistance in repair welds. As an alternative, shot peening was proposed and optimized to enhance fatigue life while meeting quality standards. Additionally, a new flaw evaluation algorithm was developed to visualize the stress intensity factor range (ΔK) and identify severity zones based on the fatigue crack growth threshold (ΔKth). Flaws inside the severity zone undergo fatigue crack growth analysis, while those outside may not require repair. This method enables a more efficient, quantitative assessment of flaw acceptability, improving both the reliability and quality control of HSP blades.
{"title":"Development of flaw acceptance criteria and quality control measures for highly skewed propeller blades","authors":"Hyeon-Su Kim , Dong-Hyun Moon , Dong-Ju Lee , Myung-Hyun Kim","doi":"10.1016/j.ijnaoe.2025.100685","DOIUrl":"10.1016/j.ijnaoe.2025.100685","url":null,"abstract":"<div><div>Highly skewed propellers (HSPs), with skew angles over 25 degrees, are widely used to improve propulsion efficiency and reduce noise. However, their unique geometry can negatively impact fatigue performance, especially in nickel-aluminum-bronze (NAB) blades prone to casting flaws. This study re-evaluated current quality control standards, focusing on the risk of thermal embrittlement from post-weld heat treatment (PWHT), which may lower fatigue resistance in repair welds. As an alternative, shot peening was proposed and optimized to enhance fatigue life while meeting quality standards. Additionally, a new flaw evaluation algorithm was developed to visualize the stress intensity factor range (ΔK) and identify severity zones based on the fatigue crack growth threshold (ΔK<sub>th</sub>). Flaws inside the severity zone undergo fatigue crack growth analysis, while those outside may not require repair. This method enables a more efficient, quantitative assessment of flaw acceptability, improving both the reliability and quality control of HSP blades.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100685"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-06-20DOI: 10.1016/j.ijnaoe.2025.100669
Kun-Yuan Tsai , Chih-Chung Fang
This study aims to develop a smart navigation database for ship manoeuvring based on real-time simulations in calm water. In the ship manoeuvring simulation, the entry of a large container ship into the Kaohsiung and Keelung harbours is executed by different marine mates by using the PC version of the real-time ship simulator. First, multiple real-time simulations are conducted for each harbour, and qualitative analyses are performed based on relevant statistics. Furthermore, the ship collision avoidance E-navigation-aid system developed by the authors is used to assist the five marine mates in entering the Kaohsiung and Keelung harbours, and the differences between the scenario in which the mates are assisted by the system and that in which they perform manual operation are discussed. Finally, based on simulation statistics, comparisons of voyage time, voyage distance, and rudder operation with and without the ship collision avoidance E-navigation-aid system are presented and discussed.
{"title":"Analysis of real-time ship manoeuvring simulation with a ship collision avoidance E-navigation aid system","authors":"Kun-Yuan Tsai , Chih-Chung Fang","doi":"10.1016/j.ijnaoe.2025.100669","DOIUrl":"10.1016/j.ijnaoe.2025.100669","url":null,"abstract":"<div><div>This study aims to develop a smart navigation database for ship manoeuvring based on real-time simulations in calm water. In the ship manoeuvring simulation, the entry of a large container ship into the Kaohsiung and Keelung harbours is executed by different marine mates by using the PC version of the real-time ship simulator. First, multiple real-time simulations are conducted for each harbour, and qualitative analyses are performed based on relevant statistics. Furthermore, the ship collision avoidance E-navigation-aid system developed by the authors is used to assist the five marine mates in entering the Kaohsiung and Keelung harbours, and the differences between the scenario in which the mates are assisted by the system and that in which they perform manual operation are discussed. Finally, based on simulation statistics, comparisons of voyage time, voyage distance, and rudder operation with and without the ship collision avoidance E-navigation-aid system are presented and discussed.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100669"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-08-13DOI: 10.1016/j.ijnaoe.2025.100682
Jung Kwan Seo , O-Hyun Kwon , Dae Kyeom Park , Joo Shin Park
Jack-up units have recently become common due to the expansion of offshore drilling and installation vessels. In most previous research, guidelines for related jack-up rig structures have assessed the interaction with the soil structure during installation in terms of penetration of a spudcan. However, the design of safe operating conditions must also take into account the interactions with the soil structure in case of horizontal impact loads from collisions with attendant and/or passing vessels. It is therefore important to consider the risk-based design of rig foundations, incorporating a study of soil-structural characteristics, to minimise the effects of collision accidents that may occur under operating conditions. In this study we develop a fundamental dataset and a simplified understanding of soil stiffness that will enable the simulation of the rig-installation process using simplified experimental models that involve soil modelling, and penetration and impact. These data will be used in structural design and risk management for industrial practices as well as in further validation/calibration studies for advanced numerical/experimental modelling and design guidance.
{"title":"A simplified experimental soil-leg interaction model for ship to Jack-up leg collision","authors":"Jung Kwan Seo , O-Hyun Kwon , Dae Kyeom Park , Joo Shin Park","doi":"10.1016/j.ijnaoe.2025.100682","DOIUrl":"10.1016/j.ijnaoe.2025.100682","url":null,"abstract":"<div><div>Jack-up units have recently become common due to the expansion of offshore drilling and installation vessels. In most previous research, guidelines for related jack-up rig structures have assessed the interaction with the soil structure during installation in terms of penetration of a spudcan. However, the design of safe operating conditions must also take into account the interactions with the soil structure in case of horizontal impact loads from collisions with attendant and/or passing vessels. It is therefore important to consider the risk-based design of rig foundations, incorporating a study of soil-structural characteristics, to minimise the effects of collision accidents that may occur under operating conditions. In this study we develop a fundamental dataset and a simplified understanding of soil stiffness that will enable the simulation of the rig-installation process using simplified experimental models that involve soil modelling, and penetration and impact. These data will be used in structural design and risk management for industrial practices as well as in further validation/calibration studies for advanced numerical/experimental modelling and design guidance.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100682"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-03-01DOI: 10.1016/j.ijnaoe.2025.100651
Maochun Wei , Keyu Chen , Fei Yan , Jikang Ma , Kaiming Liu , En Cheng
Environmental perception and object detection are pivotal research topics in the marine domain. The sea surface presents unique challenges, including harsh weather conditions, wave interference, and multi-scale targets, often resulting in suboptimal detection results. To address these issues, we present an innovative solution: the integration of the Efficient Scale Fusion Module (ESFM) into the advanced YOLO architecture, resulting in the enhanced model, YOLO-ESFM. The ESFM serves as both the backbone and detection head of the network, significantly improving performance compared to the baseline models in YOLOv5s, YOLOv7-tiny, and YOLOv7. Furthermore, to tackle the limitations of the CIOU in YOLOv7, we introduce an improved method, ZIOU, which has been rigorously evaluated and proven effective on the Sea Surface Target Dataset. Comparative studies demonstrate that YOLO-ESFM not only maintains efficiency in terms of parameters and FLOPs but also surpasses YOLOv7 in detection accuracy on both the Sea Surface Target Dataset and the PASCAL VOC 07+12 Dataset.
{"title":"YOLO-ESFM: A multi-scale YOLO algorithm for sea surface object detection","authors":"Maochun Wei , Keyu Chen , Fei Yan , Jikang Ma , Kaiming Liu , En Cheng","doi":"10.1016/j.ijnaoe.2025.100651","DOIUrl":"10.1016/j.ijnaoe.2025.100651","url":null,"abstract":"<div><div>Environmental perception and object detection are pivotal research topics in the marine domain. The sea surface presents unique challenges, including harsh weather conditions, wave interference, and multi-scale targets, often resulting in suboptimal detection results. To address these issues, we present an innovative solution: the integration of the Efficient Scale Fusion Module (ESFM) into the advanced YOLO architecture, resulting in the enhanced model, YOLO-ESFM. The ESFM serves as both the backbone and detection head of the network, significantly improving performance compared to the baseline models in YOLOv5s, YOLOv7-tiny, and YOLOv7. Furthermore, to tackle the limitations of the CIOU in YOLOv7, we introduce an improved method, ZIOU, which has been rigorously evaluated and proven effective on the Sea Surface Target Dataset. Comparative studies demonstrate that YOLO-ESFM not only maintains efficiency in terms of parameters and FLOPs but also surpasses YOLOv7 in detection accuracy on both the Sea Surface Target Dataset and the PASCAL VOC 07+12 Dataset.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100651"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01Epub Date: 2025-10-30DOI: 10.1016/j.ijnaoe.2025.100699
Soonhyun Lee, Hyungju Kim
This study presents a bibliometric analysis of the tidal energy generation research landscape, aiming to identify current trends, intellectual structures, and future directions in the field. A total of 791 relevant publications were retrieved from the Scopus database, and the data were analyzed using Biblioshiny and VOSviewer. The study identified influential publications, leading authors, prominent institutions, core journals, and contributing countries. A three-field plot was generated to visualize the relationships among keywords, key journals, and countries. Keyword coupling was employed to classify thematic clusters, and four major research themes were identified: Turbulence analysis, Tidal turbine design, Tidal energy assessment, and Feasibility analysis. Influential and relatively recent papers were selected from each cluster to review the tidal energy-related technologies, analytical methods, key findings, and potential applications associated with each theme. Based on the outcomes of this analysis, future research directions for advancing the field of tidal energy generation were briefly discussed. Overall, the research, development, and investment in the tidal energy sector appear insufficient considering its potential. To address this gap, it is essential to enhance energy conversion efficiency and to promote continued research, investment, and an increase in experimental and demonstration projects. Consequently, this study highlights these needs and discusses potential future directions for the development of tidal energy.
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