Pub Date : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100680
Daseul Jeong , Kangho Kim , Min Suk Kim , Chunsik Shim
Offshore wind farms transmit power via substations, with turbines interconnected to route electricity efficiently to shore-based substations. This study focuses on the safe transmission of power between two Floating Offshore Wind Turbines (FOWTs) using dynamic power cables. The research utilized FOWT models developed through the 12 MW INO WINDMOOR project. In this study, the models' reliability was enhanced by comparing experimental data with simulations conducted using OrcaFlex. Subsequently, four different cable connection methods were investigated and analyzed in terms of tension, curvature, and fatigue. The results indicate that the Lazy wave configuration performs best across all aspects. Although the Suspended and W-configurations exhibit lower rates of tension and curvature increase when transitioning from normal to extreme conditions, their absolute values remain significantly higher compared to the Lazy wave configuration. Additionally, the Catenary configuration may experience axial compression, which requires careful consideration during the design phase.
{"title":"Numerical study of inter-array cabling methods for two FOWTs in 150 m water depth","authors":"Daseul Jeong , Kangho Kim , Min Suk Kim , Chunsik Shim","doi":"10.1016/j.ijnaoe.2025.100680","DOIUrl":"10.1016/j.ijnaoe.2025.100680","url":null,"abstract":"<div><div>Offshore wind farms transmit power via substations, with turbines interconnected to route electricity efficiently to shore-based substations. This study focuses on the safe transmission of power between two Floating Offshore Wind Turbines (FOWTs) using dynamic power cables. The research utilized FOWT models developed through the 12 MW INO WINDMOOR project. In this study, the models' reliability was enhanced by comparing experimental data with simulations conducted using OrcaFlex. Subsequently, four different cable connection methods were investigated and analyzed in terms of tension, curvature, and fatigue. The results indicate that the Lazy wave configuration performs best across all aspects. Although the Suspended and W-configurations exhibit lower rates of tension and curvature increase when transitioning from normal to extreme conditions, their absolute values remain significantly higher compared to the Lazy wave configuration. Additionally, the Catenary configuration may experience axial compression, which requires careful consideration during the design phase.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100680"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920227","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2024.100640
Hyun-Duk Seo , Jae Min Lee
This paper presents a new analysis method for predicting welding distortions induced by welding heat during the assembly process in various engineering fields. In the proposed method, the tendon force contributing to longitudinal bending deformation is calculated based on the measured inherent deformations in the welding specimen. Additionally, welding distortions along the transverse and longitudinal directions are simultaneously estimated without undesired numerical errors by adopting orthotropic thermal coefficients. Through the proposed method, reliable numerical solutions can be obtained using only linear elastic analysis with the finite element procedure. Consequently, the proposed method can be easily applied to multi-pass welding problems without requiring additional treatments, as it relies on the inherent deformations for the analysis. The performance of the proposed method is verified through numerical and experimental investigations for fillet-welded structures.
{"title":"A new welding distortion analysis method considering inherent deformation-based tendon force estimation","authors":"Hyun-Duk Seo , Jae Min Lee","doi":"10.1016/j.ijnaoe.2024.100640","DOIUrl":"10.1016/j.ijnaoe.2024.100640","url":null,"abstract":"<div><div>This paper presents a new analysis method for predicting welding distortions induced by welding heat during the assembly process in various engineering fields. In the proposed method, the tendon force contributing to longitudinal bending deformation is calculated based on the measured inherent deformations in the welding specimen. Additionally, welding distortions along the transverse and longitudinal directions are simultaneously estimated without undesired numerical errors by adopting orthotropic thermal coefficients. Through the proposed method, reliable numerical solutions can be obtained using only linear elastic analysis with the finite element procedure. Consequently, the proposed method can be easily applied to multi-pass welding problems without requiring additional treatments, as it relies on the inherent deformations for the analysis. The performance of the proposed method is verified through numerical and experimental investigations for fillet-welded structures.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100640"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164721","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100667
ChangYong Song
This study presents a probabilistic design optimization method for enhancing the design safety of shipboard radar mast, which accommodates navigational communication equipment such as radar scanners and antennas. Such structure requires not only robust vibration and strength performance but also minimized weight to reduce marine pollution and increase operational efficiency. Given the lack of definitive classification rules for radar mast structural design, this study employs various reliability analysis methods. A radial basis function neural-network (RBFN) meta-model, generated from Design of Experiments data, was utilized for optimization and reliability analyzes. The probabilistic design optimization problem was formulated to determine the random design variables such that the weight is minimized subject to the probabilistic constraints of vibration and structural strength performance. Various reliability analysis methods such as adaptive importance sampling, first-order reliability method, mean value first-order second moment method, and second-order reliability method were compared to identify the best approach for the probabilistic design optimization. The study concludes by identifying the reliable probabilistic optimal method for improving design safety relative to deterministic design optimization results.
{"title":"Probabilistic design optimization of shipboard radar mast by adopting RBFN meta-model and various reliability methods","authors":"ChangYong Song","doi":"10.1016/j.ijnaoe.2025.100667","DOIUrl":"10.1016/j.ijnaoe.2025.100667","url":null,"abstract":"<div><div>This study presents a probabilistic design optimization method for enhancing the design safety of shipboard radar mast, which accommodates navigational communication equipment such as radar scanners and antennas. Such structure requires not only robust vibration and strength performance but also minimized weight to reduce marine pollution and increase operational efficiency. Given the lack of definitive classification rules for radar mast structural design, this study employs various reliability analysis methods. A radial basis function neural-network (RBFN) meta-model, generated from Design of Experiments data, was utilized for optimization and reliability analyzes. The probabilistic design optimization problem was formulated to determine the random design variables such that the weight is minimized subject to the probabilistic constraints of vibration and structural strength performance. Various reliability analysis methods such as adaptive importance sampling, first-order reliability method, mean value first-order second moment method, and second-order reliability method were compared to identify the best approach for the probabilistic design optimization. The study concludes by identifying the reliable probabilistic optimal method for improving design safety relative to deterministic design optimization results.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100667"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253537","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100690
Sin-Der Lee , Cheng-Yu Fan , Chun-Hsin Yang
Since 2012, Keelung Port has shifted from cargo operations to a tourism-focused harbor. By 2018, it hosted 282 cruise ships and over 940,000 passengers. However, seasonal weather-typhoons in summer and monsoons in winter-poses navigation risks. This study focuses on the SuperStar Aquarius, the most frequent cruise ship at the port in 2018, analyzing its routes using AIS data. Ninety Fast Time Simulations were conducted under six scenarios, mainly under strong northeast monsoon conditions with wind speeds of 8, 10, and 13 m/s and varying tidal flows. Results showed significant route deviations in Zone 2 due to environmental forces. The greatest navigational risk was observed during half-speed entries under winter monsoon conditions, where the combination of reduced maneuverability and strong lateral forces led to excessive drift toward the western breakwater-raising the potential for collisions. The findings provide valuable insights for improving cruise ship navigation safety and guiding port planning efforts.
{"title":"Exploration of safe navigation zones for large cruise ships entering Keelung port by fast time simulations","authors":"Sin-Der Lee , Cheng-Yu Fan , Chun-Hsin Yang","doi":"10.1016/j.ijnaoe.2025.100690","DOIUrl":"10.1016/j.ijnaoe.2025.100690","url":null,"abstract":"<div><div>Since 2012, Keelung Port has shifted from cargo operations to a tourism-focused harbor. By 2018, it hosted 282 cruise ships and over 940,000 passengers. However, seasonal weather-typhoons in summer and monsoons in winter-poses navigation risks. This study focuses on the SuperStar Aquarius, the most frequent cruise ship at the port in 2018, analyzing its routes using AIS data. Ninety Fast Time Simulations were conducted under six scenarios, mainly under strong northeast monsoon conditions with wind speeds of 8, 10, and 13 m/s and varying tidal flows. Results showed significant route deviations in Zone 2 due to environmental forces. The greatest navigational risk was observed during half-speed entries under winter monsoon conditions, where the combination of reduced maneuverability and strong lateral forces led to excessive drift toward the western breakwater-raising the potential for collisions. The findings provide valuable insights for improving cruise ship navigation safety and guiding port planning efforts.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100690"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415146","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100706
Yulong Tuo , Lebin Kong , Shaolong Geng , Zhouhua Peng , Shasha Wang
This paper proposes a fixed-time event-triggered anti-windup collaborative controller for a towing system consisting of an unactuated offshore platform and multiple tugs. Firstly, a fixed-time virtual controller is proposed to acquire required towing force for the platform to track expected trajectory. Subsequently, the required towing force is allocated as desired towline tensions by quadratic programming algorithm, and corresponding desired length of each towline is calculated through towline catenary model. Based on desired towline tensions and lengths, a fixed-time collaborative controller is constructed for tugs with following key components: the input saturation of tugs is approximated by a Gaussian error function; a fixed-time extended state observer is employed to rapidly estimate compound disturbances including saturation approximation errors; a novel dynamic threshold event-triggered mechanism is designed to decrease the control input update frequency while maintaining the convergence performance of entire control system. Finally, simulation results demonstrate the effectiveness of proposed control method.
{"title":"Fixed-time dynamic threshold event-triggered anti-windup collaborative control for multi-tug towing of unactuated offshore floating platform","authors":"Yulong Tuo , Lebin Kong , Shaolong Geng , Zhouhua Peng , Shasha Wang","doi":"10.1016/j.ijnaoe.2025.100706","DOIUrl":"10.1016/j.ijnaoe.2025.100706","url":null,"abstract":"<div><div>This paper proposes a fixed-time event-triggered anti-windup collaborative controller for a towing system consisting of an unactuated offshore platform and multiple tugs. Firstly, a fixed-time virtual controller is proposed to acquire required towing force for the platform to track expected trajectory. Subsequently, the required towing force is allocated as desired towline tensions by quadratic programming algorithm, and corresponding desired length of each towline is calculated through towline catenary model. Based on desired towline tensions and lengths, a fixed-time collaborative controller is constructed for tugs with following key components: the input saturation of tugs is approximated by a Gaussian error function; a fixed-time extended state observer is employed to rapidly estimate compound disturbances including saturation approximation errors; a novel dynamic threshold event-triggered mechanism is designed to decrease the control input update frequency while maintaining the convergence performance of entire control system. Finally, simulation results demonstrate the effectiveness of proposed control method.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100706"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614635","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100710
Ruoling Zhou , Liu Yang , Ailong Fan , Qing Liu , Lei Wang , JunZhang Yang , Nikola Vladimir
With the advancement of global environmental protection policies and the transformation of energy structure, battery electric ships (BESs) are expected to enter a period of accelerated development. However, the associated risk factors are more complex than those of traditional ships, making it difficult for existing risk assessment approaches to fully capture emerging risks. This paper systematically identifies the key risk factors from four dimensions: seafarer, ship, environment and management, summarizes the risk assessment methods ranging from single-component failure analysis to overall ship safety evaluation, and examines corresponding assessment results and preventive measures. The findings show that seafarer and ship risks exert direct influences on ship safety and impose higher technical requirements, whereas environmental and management risks exert indirect effects. For single-component failures, differentiated assessment methods are recommended, such as process-based analyses for seafarer risks, component-focused approaches for batteries, motors, and electronic systems, and dynamic hazard identification for charging facilities and environmental factors. For overall ship safety, comprehensive risk assessment frameworks are suggested. Finally, targeted prevention measures are proposed for various risk categories, including optimization of battery design and enhancement of seafarer competencies. Current risk assessment for BESs faces challenges related to limited data, immature models, and insufficient regulations. Future efforts should focus on gradually accumulating accident cases and risk datasets, as well as developing quantitative assessment methods or models capable of capturing interdependencies among risks.
{"title":"Systematic review of battery electric ship safety: risk factors, assessment methods, and preventive measures","authors":"Ruoling Zhou , Liu Yang , Ailong Fan , Qing Liu , Lei Wang , JunZhang Yang , Nikola Vladimir","doi":"10.1016/j.ijnaoe.2025.100710","DOIUrl":"10.1016/j.ijnaoe.2025.100710","url":null,"abstract":"<div><div>With the advancement of global environmental protection policies and the transformation of energy structure, battery electric ships (BESs) are expected to enter a period of accelerated development. However, the associated risk factors are more complex than those of traditional ships, making it difficult for existing risk assessment approaches to fully capture emerging risks. This paper systematically identifies the key risk factors from four dimensions: seafarer, ship, environment and management, summarizes the risk assessment methods ranging from single-component failure analysis to overall ship safety evaluation, and examines corresponding assessment results and preventive measures. The findings show that seafarer and ship risks exert direct influences on ship safety and impose higher technical requirements, whereas environmental and management risks exert indirect effects. For single-component failures, differentiated assessment methods are recommended, such as process-based analyses for seafarer risks, component-focused approaches for batteries, motors, and electronic systems, and dynamic hazard identification for charging facilities and environmental factors. For overall ship safety, comprehensive risk assessment frameworks are suggested. Finally, targeted prevention measures are proposed for various risk categories, including optimization of battery design and enhancement of seafarer competencies. Current risk assessment for BESs faces challenges related to limited data, immature models, and insufficient regulations. Future efforts should focus on gradually accumulating accident cases and risk datasets, as well as developing quantitative assessment methods or models capable of capturing interdependencies among risks.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100710"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681453","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100654
Qingya Zhang , Jing Xu , Baigong Wu , Qiuping Wang , Xingyu Wang , Zhenrui Zhang , Hong Zhou
Welding residual stress (WRS) seriously affects the fracture performance of welded structures made of high-strength steel (HSS). Nevertheless, the influence mechanism of WRS on fracture performance remains unclear. In this study, a thick weld of Q690 HSS is fabricated, and experiments are conducted to test the tensile performance of the base metal (BM), welded metal (WM), and the welded joint. The Gurson-Tvergaard-Needleman (GTN) parameters for the thick weld are identified through experimental data and numerical simulation. Using transverse residual stress (TRS) and welding defects as initial inputs, the ductile fracture behavior of the thick weld is predicted through the identified GTN damage model. When TRS and welding defects are taken into account, the crack distribution shifts from the BM to the main WM and the back HAZ. The higher tensile stress in the WM, combined with welding defects, significantly reduce the fracture strength by accelerating the void growth and coalescence process.
{"title":"Influence of transverse residual stress and welding defect on fracture performance of thick weld based on GTN damage model","authors":"Qingya Zhang , Jing Xu , Baigong Wu , Qiuping Wang , Xingyu Wang , Zhenrui Zhang , Hong Zhou","doi":"10.1016/j.ijnaoe.2025.100654","DOIUrl":"10.1016/j.ijnaoe.2025.100654","url":null,"abstract":"<div><div>Welding residual stress (WRS) seriously affects the fracture performance of welded structures made of high-strength steel (HSS). Nevertheless, the influence mechanism of WRS on fracture performance remains unclear. In this study, a thick weld of Q690 HSS is fabricated, and experiments are conducted to test the tensile performance of the base metal (BM), welded metal (WM), and the welded joint. The Gurson-Tvergaard-Needleman (GTN) parameters for the thick weld are identified through experimental data and numerical simulation. Using transverse residual stress (TRS) and welding defects as initial inputs, the ductile fracture behavior of the thick weld is predicted through the identified GTN damage model. When TRS and welding defects are taken into account, the crack distribution shifts from the BM to the main WM and the back HAZ. The higher tensile stress in the WM, combined with welding defects, significantly reduce the fracture strength by accelerating the void growth and coalescence process.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100654"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621101","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2024.100642
Lin Ma , Dengkai Chen , Yanpu Yan , Weilan An
Submarine compartment layout design is a multi-objective optimization problem, which needs to consider the mutual position, passage relationship, comfort, convenience, and other aspects between compartments. Based on the characteristics of submarine living cabin layouts, this paper introduces a fuzzy evaluation method to comprehensively analyze the functional adjacency and personnel circulation relationships between compartments. Moreover, combined with emergency evacuation requirements, the study established a double layer cabin layout optimization model and proposed a multi-population genetic algorithm for optimizing the layout of submarine living cabins. Simulation experiments were conducted using MATLAB software to validate the algorithm's effectiveness. A comparison was made between the multi-population genetic algorithm and the standard genetic algorithm. The results verify the feasibility of the proposed design method and its ability to effectively address the submarine compartment layout optimization problem, thereby improving the efficiency of compartment layout optimization design.
{"title":"An optimization design method for submarine cabins based on intelligent algorithms","authors":"Lin Ma , Dengkai Chen , Yanpu Yan , Weilan An","doi":"10.1016/j.ijnaoe.2024.100642","DOIUrl":"10.1016/j.ijnaoe.2024.100642","url":null,"abstract":"<div><div>Submarine compartment layout design is a multi-objective optimization problem, which needs to consider the mutual position, passage relationship, comfort, convenience, and other aspects between compartments. Based on the characteristics of submarine living cabin layouts, this paper introduces a fuzzy evaluation method to comprehensively analyze the functional adjacency and personnel circulation relationships between compartments. Moreover, combined with emergency evacuation requirements, the study established a double layer cabin layout optimization model and proposed a multi-population genetic algorithm for optimizing the layout of submarine living cabins. Simulation experiments were conducted using MATLAB software to validate the algorithm's effectiveness. A comparison was made between the multi-population genetic algorithm and the standard genetic algorithm. The results verify the feasibility of the proposed design method and its ability to effectively address the submarine compartment layout optimization problem, thereby improving the efficiency of compartment layout optimization design.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100642"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164722","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}
Planning safe and efficient routes for small ships inside the marina is essential. However, existing route planning methods have been primarily developed for commercial ships and, therefore, fail to adequately capture the unique navigational characteristics of small ships. To address this limitation, this study proposed a route planning method for small ships navigating inside the marina. The proposed method generated centerline charts based on a Voronoi diagram. Here, the Voronoi diagram was generated from the integrated nautical charts, which comprehensively account for various features inside the marina. Then, the A∗ algorithm was applied by incorporating water depth to plan the optimal route. Furthermore, postprocessing of the planned route was introduced to account for the dredged area and the port-to-port passing rules at marina entrances, including route smoothing. Finally, the proposed method was applied to a marina near the Miami region to evaluate its effectiveness. The results demonstrate that, unlike existing methods, the proposed method successfully considers water depth, dredged area, and port-to-port passing rules at marina entrances while also maintaining a safety distance from the shoreline, all within a short computation time. Accordingly, the proposed method is expected to enhance the safety and efficiency of small ships navigating inside the marina.
{"title":"A route planning method for small ships inside the marina","authors":"In-Chang Yeo , Myung-Il Roh , Dong-Guen Jeong , Jun-Sik Lee","doi":"10.1016/j.ijnaoe.2025.100684","DOIUrl":"10.1016/j.ijnaoe.2025.100684","url":null,"abstract":"<div><div>Planning safe and efficient routes for small ships inside the marina is essential. However, existing route planning methods have been primarily developed for commercial ships and, therefore, fail to adequately capture the unique navigational characteristics of small ships. To address this limitation, this study proposed a route planning method for small ships navigating inside the marina. The proposed method generated centerline charts based on a Voronoi diagram. Here, the Voronoi diagram was generated from the integrated nautical charts, which comprehensively account for various features inside the marina. Then, the A∗ algorithm was applied by incorporating water depth to plan the optimal route. Furthermore, postprocessing of the planned route was introduced to account for the dredged area and the port-to-port passing rules at marina entrances, including route smoothing. Finally, the proposed method was applied to a marina near the Miami region to evaluate its effectiveness. The results demonstrate that, unlike existing methods, the proposed method successfully considers water depth, dredged area, and port-to-port passing rules at marina entrances while also maintaining a safety distance from the shoreline, all within a short computation time. Accordingly, the proposed method is expected to enhance the safety and efficiency of small ships navigating inside the marina.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100684"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917860","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 : 2025-01-01DOI: 10.1016/j.ijnaoe.2025.100659
Jeongung Park , Gyubaek An
With increasing strength and thickness of steel plates, the susceptibility to brittle fracture also grows, primarily due to the reduction in toughness of both the base metal and the weld zone. To maintain structural integrity and mitigate fracture risks in thick, high-strength steels—especially in applications such as ship hulls—advanced design strategies and materials with enhanced brittle crack arrestability have been introduced. The arrest performance is typically assessed by determining the brittle crack arrestability value (Kca) through large-scale experimental methods. However, due to the high cost, time, and equipment demands of such tests, alternative approaches using small-scale specimens and numerical simulations have been actively investigated to estimate Kca more efficiently. This study establishes an analytical model by conducting a parametric investigation of the key factors influencing Kca determination. The analysis incorporates yield stress variations influenced by temperature gradients, strain rates, and thermal effects, considering Young's modulus and strain rate dependency. Additionally, the study examines the influence of crack-growth increments and the impact energy effect on brittle crack initiation (KIC). The reliability of the proposed model is validated by comparing its Kca predictions with experimental results obtained from the ESSO test.
{"title":"Finite-element analysis on the parameters influencing the brittle crack arrest in steel plates","authors":"Jeongung Park , Gyubaek An","doi":"10.1016/j.ijnaoe.2025.100659","DOIUrl":"10.1016/j.ijnaoe.2025.100659","url":null,"abstract":"<div><div>With increasing strength and thickness of steel plates, the susceptibility to brittle fracture also grows, primarily due to the reduction in toughness of both the base metal and the weld zone. To maintain structural integrity and mitigate fracture risks in thick, high-strength steels—especially in applications such as ship hulls—advanced design strategies and materials with enhanced brittle crack arrestability have been introduced. The arrest performance is typically assessed by determining the brittle crack arrestability value (Kca) through large-scale experimental methods. However, due to the high cost, time, and equipment demands of such tests, alternative approaches using small-scale specimens and numerical simulations have been actively investigated to estimate Kca more efficiently. This study establishes an analytical model by conducting a parametric investigation of the key factors influencing Kca determination. The analysis incorporates yield stress variations influenced by temperature gradients, strain rates, and thermal effects, considering Young's modulus and strain rate dependency. Additionally, the study examines the influence of crack-growth increments and the impact energy effect on brittle crack initiation (K<sub>IC</sub>). The reliability of the proposed model is validated by comparing its Kca predictions with experimental results obtained from the ESSO test.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"17 ","pages":"Article 100659"},"PeriodicalIF":2.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916874","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}
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