International Journal of Naval Architecture and Ocean Engineering最新文献

{"title":"Numerical study of inter-array cabling methods for two FOWTs in 150 m water depth","authors":"Daseul Jeong ,&nbsp;Kangho Kim ,&nbsp;Min Suk Kim ,&nbsp;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}

{"title":"A new welding distortion analysis method considering inherent deformation-based tendon force estimation","authors":"Hyun-Duk Seo ,&nbsp;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}

{"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}

{"title":"Influence of transverse residual stress and welding defect on fracture performance of thick weld based on GTN damage model","authors":"Qingya Zhang ,&nbsp;Jing Xu ,&nbsp;Baigong Wu ,&nbsp;Qiuping Wang ,&nbsp;Xingyu Wang ,&nbsp;Zhenrui Zhang ,&nbsp;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}

{"title":"An optimization design method for submarine cabins based on intelligent algorithms","authors":"Lin Ma ,&nbsp;Dengkai Chen ,&nbsp;Yanpu Yan ,&nbsp;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}

{"title":"Finite-element analysis on the parameters influencing the brittle crack arrest in steel plates","authors":"Jeongung Park ,&nbsp;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_IC). 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}

{"title":"A route planning method for small ships inside the marina","authors":"In-Chang Yeo ,&nbsp;Myung-Il Roh ,&nbsp;Dong-Guen Jeong ,&nbsp;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}

{"title":"A fundamental study on structural strength assessment of U-bolts for expanded application to shipbuilding and offshore piping systems","authors":"Minsung Chun ,&nbsp;Jinyoung Kim ,&nbsp;Kangho Kim ,&nbsp;Daseul Jeong ,&nbsp;Deokyeon Lee ,&nbsp;Sungkuk Wi ,&nbsp;Byeonghwa Kim ,&nbsp;Cheonghak Kim ,&nbsp;Chun-Sik Shim","doi":"10.1016/j.ijnaoe.2023.100561","DOIUrl":"10.1016/j.ijnaoe.2023.100561","url":null,"abstract":"<div><p>The currently defined Safe Working Load (SWL) of the U-bolt has been determined excessively conservatively. To address this issue, this study conducted structural tests and numerical analysis on round type U-bolts of various sizes. The structural tests were conducted using a 2.5 MN actuator at the SURF R&amp;D center, and the strain was measured through a uniaxial strain gage. The test showed the failure load greatly exceeded the design load with horizontal force. This necessitates a reevaluation and redefinition of load standards. Nonlinear numerical analysis was carried out, and these results were compared with the structural test results. When subjected to vertical loading, behavior was similar to uniaxial tension. On the other hand, using linear elastic analysis for determining SWL for horizontal loading was found to be irrational. A methodology was proposed for estimating the SWL of the U-bolt.</p></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"16 ","pages":"Article 100561"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209267822300050X/pdfft?md5=51f5052d5c552a2bb1acd4642ed89d4d&pid=1-s2.0-S209267822300050X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628399","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}

{"title":"Evaluation of subgrid scale models in turbulent large eddy simulations of pumpjet propulsor","authors":"Lin Ke ,&nbsp;Jinming Ye ,&nbsp;Wei He","doi":"10.1016/j.ijnaoe.2023.100565","DOIUrl":"10.1016/j.ijnaoe.2023.100565","url":null,"abstract":"<div><p>To assess the effectiveness of subgrid scale (SGS) models on the prediction results of unsteady loads and turbulent fluctuation of pumpjet propulsors equipped with both front and rear stators, a pumpjet propulsor computational model with attached parts at the model scale is developed using a fully structured mesh, and large eddy simulations are conducted. The computational results of the different SGS models are compared based on five aspects: open water characteristics, turbulence parameters, incoming turbulence spectrum, vortex structure, and fluctuating pressure. Their results are also compared with the experimental values, and the correlation between the internal flow characteristics of the pumpjet propulsor and the turbulent fluctuation is analyzed. According to the results, as regards the prediction of the open water performance of the pumpjet propulsor containing both front and rear stators, the overall trend obtained by the three subgrid models is similar, and the error between the values predicted by the SL model and the experimental ones is the smallest. At the same mesh level, the turbulent fluctuating scale obtained by the SL model is larger than that obtained by the WALE and DSL models, and the turbulent time scale obtained by the DSL model has the smallest fluctuation in the circumferential direction. Among the three SGS models, the turbulent fluctuating scale of the SL model is larger than those of the WALE and DSL models. The SL model exhibits the largest energy dissipation among the three SGS models, followed by the DSL model, while that of the WALE model is the smallest. In the WALE model, the leakage vortex at the top of the blade is the longest, followed by the DSL model, while it is the shortest in the SL model. In the WALE and DSL models, the fluctuating load fluctuates more in the transition region from the middle section to the trailing edge of the blade.</p></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"16 ","pages":"Article 100565"},"PeriodicalIF":2.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2092678223000547/pdfft?md5=2377db61ed383f849c1b356aa654b2c1&pid=1-s2.0-S2092678223000547-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138743515","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}

{"title":"Experimental study of the steady-state and dynamic characteristics of 1 kW water-cooled PEMFC","authors":"Quang Khai Nguyen ,&nbsp;Hyun Park ,&nbsp;Kwang Hyo Jung ,&nbsp;Jae Heon Kwon ,&nbsp;Gang Nam Lee","doi":"10.1016/j.ijnaoe.2024.100620","DOIUrl":"10.1016/j.ijnaoe.2024.100620","url":null,"abstract":"<div><div>The Polymer Electrolyte Membrane Fuel Cell (PEMFC) has been widely developed in the shipping sector, prompting the need to accurately understand its characteristics under various operating conditions and load variations. This study presents an experimental investigation into the steady-state and dynamic characteristics of a 1 kW water-cooled PEMFC stack, aiming to optimize reactant consumption and to assess the PEMFC voltage response under varying load conditions. In the steady-state tests, experiments were conducted at three different stoichiometries of hydrogen and air to evaluate the effect of stoichiometry on PEMFC efficiency. The results showed that the electrical efficiency improved by 10% at lower hydrogen stoichiometry (1.2) compared to the manufacturer's recommended values (1.6). In the dynamic tests, the behaviors of undershoot voltage and open circuit voltage (OCV) were examined using load-step and load-ramp conditions. Results showed that the undershoot voltage could be reduced either by narrowing the load step size and ramp rate or by implementing a reactant supply strategy, which increasing the gas flow rates before increasing the current. A consistent 0.55 V recovery was observed at the OCV after 10 s, regardless of the step sizes or ramp rates of load, indicating that the PEMFC was in good state of health after dynamic load conditions. OCV can serve as an effective diagnostic tool for assessing PEMFC health.</div></div>","PeriodicalId":14160,"journal":{"name":"International Journal of Naval Architecture and Ocean Engineering","volume":"16 ","pages":"Article 100620"},"PeriodicalIF":2.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442728","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}