Brodogradnja最新文献_第2页

GIS-based floating offshore wind turbine installation site selection using fuzzy analytic hierarchy process in northeast Aegean Sea 利用模糊层次分析法在爱琴海东北部选择基于地理信息系统的浮式海上风力涡轮机安装地点

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-04-01 DOI: 10.21278/brod75204

S. A. Erkurtulmus, Emre Pesman

{"title":"GIS-based floating offshore wind turbine installation site selection using fuzzy analytic hierarchy process in northeast Aegean Sea","authors":"S. A. Erkurtulmus, Emre Pesman","doi":"10.21278/brod75204","DOIUrl":"https://doi.org/10.21278/brod75204","url":null,"abstract":"The ever-increasing consumption of electrical energy due to increasing requirements arising in parallel with the developing technology forces manufactures and users to seek new and environmentally compatible energy resources. Due to it endless energy potential and continuity, wind energy, which has been used by humanity for various purposes for centuries, continues its journey, which started with windmills that transform one form of mechanical energy into another, with offshore wind energy turbines. In this study, installation site selection, which is the first step for floating offshore wind turbine installation, is carried out. First, a Fuzzy Analytic Hierarchy Process (F-AHP) is applied to obtain the weights of criteria. Transformed alternatives and criteria in a fuzzy decision matrix through triangular fuzzy numbers are used to obtain a database via a Geographic Information System (GIS). Finally, the installation site and study area are determined. This area is located in the Northeast Aegean Sea, between Çanakkale and Gökçeada, 12 km to the northeast of Gökçeada, and 12 square kilometers. The minimum distance of the area to ship routes is 3000 m, and its minimum distance to fault lines is 2000 m. The average sea depth is 110 m, and the average wind speed is 9.26 m/s (18 knots). With this potential, enough energy can be generated for settlements on Gökçeada and the coastlines.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140354864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on optimal design of 6in offshore flange connector’s sealing structure 6 英寸海上法兰连接器密封结构优化设计研究

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-04-01 DOI: 10.21278/brod75207

Jianguo Qin, Minghui Ji, Haixia Gong, Sijia Guo, Yanfeng Zhang, Yejiang Li, Haitang Cen

{"title":"Research on optimal design of 6in offshore flange connector’s sealing structure","authors":"Jianguo Qin, Minghui Ji, Haixia Gong, Sijia Guo, Yanfeng Zhang, Yejiang Li, Haitang Cen","doi":"10.21278/brod75207","DOIUrl":"https://doi.org/10.21278/brod75207","url":null,"abstract":"Taking the maximum contact pressure as the objective function for, the optimal design model of the offshore flange connector was established to analyze the impact of the flange cone's angle and the curvature radius of the lenticular gasket's contact surface on the sealing performance of the connector. An optimized three-dimensional model of the offshore flange connector was constructed using the MATLAB software's fmincon function to obtain the optimal size of the cone angle and curvature radius. The maximum contact pressure and maximum equivalent stress values of the non-optimized and optimized offshore flange connectors under the cross combination of two design pressures and six operating temperatures were analyzed by Workbench software, and the sealing performance of the non-optimized and optimized offshore flange connectors was compared according to the sealing judgment basis. The results show that compared with the previously studied offshore flange connector, the sealing structure of optimized offshore flange exhibits maximum increase in contact pressure increase but maximum decrease in equivalent stress. Under actual operating circumstances, the optimized offshore flange connection performs better in sealing and is less prone to breakage.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Subsea jumper damage detection based on fractal analysis and modal characteristics 基于分形分析和模态特征的海底跳线损坏检测

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-03-01 DOI: 10.21278/brod75201

Yan Li

引用次数: 0

The decarbonisation of the maritime sector: Horizon 2050 海事部门的去碳化：地平线 2050

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-03-01 DOI: 10.21278/brod75202

José Miguel Mahía Prados

{"title":"The decarbonisation of the maritime sector: Horizon 2050","authors":"José Miguel Mahía Prados","doi":"10.21278/brod75202","DOIUrl":"https://doi.org/10.21278/brod75202","url":null,"abstract":"The decarbonisation of the maritime sector is one of the world’s priorities to reduce the volume of polluting emissions. The basis of this decarbonisation is the adaptation of existing ships to emission control regulations by means of transformations, installation of new equipment, development of new low-emission fuels and development of the infrastructure that makes the supply of this new generation of fuels feasible. In addition, hydrogen is the energy vector for all these new technologies, and its role over the next 30 years needs to be addressed. In a changing global situation such as the one we are currently experiencing; this article has the objective of making a review paper on the different fuels currently being used in the maritime sector and the existing alternatives. It also discusses the situation and the impact the current environmental situation has on the world ship order book, both in terms of legislation and economics. As a conclusion, the Liquefied Natural Gas (LNG) will have a very important role to play as a bridge between the current situation and the development of hydrogen technology. Hydrogen is an energy vector that can achieve the decarbonisation objectives by 2050. Storage problems, lack of infrastructures to supply it and the development of technology and regulations are the major challenges it will have to face. Biofuels also present a serious proposal for the decarbonisation of the sector, and the role of hydrogen in their composition, is essential to achieve green fuel generation.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140275735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ship collision avoidance decision-making research in coastal waters considering uncertainty of target ships 考虑目标船只不确定性的沿海水域避碰决策研究

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-03-01 DOI: 10.21278/brod75203

Jianjie Gao, Yuquan Zhang

{"title":"Ship collision avoidance decision-making research in coastal waters considering uncertainty of target ships","authors":"Jianjie Gao, Yuquan Zhang","doi":"10.21278/brod75203","DOIUrl":"https://doi.org/10.21278/brod75203","url":null,"abstract":"Ship collision avoidance has always been a concern and it is crucial for achieving safe navigation of ships at sea. There are many studies on ship collision avoidance in open water, but less attention on coastal waters considering the uncertainty of target ships due to the complexity of the environment and traffic flow. In this paper, collision avoidance decision-making research in coastal waters considering the uncertainty of target ships was proposed. Firstly, accurate ship trajectories are obtained by preprocessing the raw Automatic Identification System (AIS) data. Subsequently, the processed trajectories are clustered using the Ordering Points to Identify the Clustering Structure (OPTICS) algorithm and Hausdorff distance, acquiring a dataset for trajectory prediction of target ships. Then, a mixed Gaussian model is utilized to calculate the prior probability distribution of the prediction model, thus establishing a trajectory prediction model that considers the uncertainty of the target ship. Finally, ship maneuverability is simulated using the Mathematical Model Group (MMG) and Proportion Integration Differentiation (PID) models, and a collision avoidance decision-making model for ships is constructed. The proposed algorithm has been tested and verified in a case study. The results show that the approach effectively predicts the trajectory of the target ship and facilitates informed collision avoidance decision-making.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic evaluation of dynamic positioning operability with a Quasi-Monte Carlo approach 用准蒙特卡洛方法对动态定位可操作性进行概率评估

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-01-01 DOI: 10.21278/brod75105

Francesco Mauro

{"title":"Probabilistic evaluation of dynamic positioning operability with a Quasi-Monte Carlo approach","authors":"Francesco Mauro","doi":"10.21278/brod75105","DOIUrl":"https://doi.org/10.21278/brod75105","url":null,"abstract":"During the design phase of an offshore unit, estimating the station-keeping capabilities of the dynamic positioning (DP) system is mandatory. This means, in conventional offshore applications, to determine the maximum sustainable wind speed as a function of the encounter heading, which the unit may counteract by employing the onboard actuators or mooring lines only. Besides the deterministic estimation of DP capability, it is possible to assess the operability of the DP system following a non-deterministic probabilistic process by employing the site-specific joint wind-wave distributions to model the environment. In such a case, the operability results from a Monte Carlo integration process. Here it is proposed to enhance the applicability of the probabilistic analysis of DP operability, investigating the application of a Quasi-Monte Carlo method. In this sense, the procedure uses quasi-random samplings following a Sobol sequence instead of employing random samples of the joint distributions. In this paper, the Quasi-Monte Carlo process is tested and compared on a reference ship, highlighting the improvements to the established probabilistic DP prediction concerning the number of calculations needed to estimate operability. The significant reduction of computational time makes the newly implemented method suitable for the early design stage applications.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139125376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of damage to ship personnel in different seated postures by near-field underwater explosions 近场水下爆炸对不同坐姿船员的伤害分析

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-01-01 DOI: 10.21278/brod75107

Kai Li

{"title":"Analysis of damage to ship personnel in different seated postures by near-field underwater explosions","authors":"Kai Li","doi":"10.21278/brod75107","DOIUrl":"https://doi.org/10.21278/brod75107","url":null,"abstract":"With the frequent occurrence of ship explosion accidents at sea, the safety of ships and crews has attracted much attention. At present, the research on crew injury is relatively weak. Consequently, the current study constructs a numerical model of the ship structure-crew-blast flow field to investigate the discrepancies in injury response of crew members across different sitting postures. LS-DYNA software is used for simulation and direct analysis to evaluate the damage of crew members in different positions under 100 kg TNT equivalent and 2 m blast distance conditions, and the relationship between different explosive equivalents and crew damage is analyzed. The results demonstrate that for crew members situated in working compartment, the injuries incurred across different sitting postures also differed. The lower leg and foot sections were at greater injury risks, while the head area was associated with minimal damage risks. Altering upper body postures of the crew human body had only a very small impact on lower extremity injuries. Moreover, positive correlations were exhibited between explosive equivalents and crew injury values. The research findings may offer references for injury analysis and protective device design of naval personnel.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139128099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD-FEM simulation of water entry of aluminium flat stiffened plate structure considering the effects of hydroelasticity 考虑水弹性效应的铝制平板加劲板结构进水 CFD-FEM 模拟

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-01-01 DOI: 10.21278/brod75108

Jialong Jiao

引用次数: 0

An evaluation of operational risks for general cargo ship operators 评估杂货船运营商的运营风险

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-01-01 DOI: 10.21278/brod75101

Ji-Feng Ding

{"title":"An evaluation of operational risks for general cargo ship operators","authors":"Ji-Feng Ding","doi":"10.21278/brod75101","DOIUrl":"https://doi.org/10.21278/brod75101","url":null,"abstract":"As general cargo ships (GCSs) hold certain advantages over more mainstream shipping services, GCSs have a considerable degree of importance in the shipping market. This paper focuses on the use of risk evaluation procedures to perform empirical analysis of the operational risk faced by GCS operators, which is a subject that has garnered relatively little academic attention. After identifying risk factors, four risk aspects and 16 operational risk factors are determined and used to construct an Analytic Hierarchy Process (AHP)-based risk matrix evaluation model. An expert questionnaire addressing both subjective and objective facets is then used to perform evaluation of the model, enabling conversion of the relative weights to risk scales. Lastly, the determination of each risk factor’s risk areas allows the proposal of risk management strategies. The results indicate that four of the risk factors are in the high risk area; these consisted of the loading stage factor “delays at port of loading,” the laden voyage stage factor “poor stowage and securing,” the laden voyage stage factor “perils of the sea,” and the discharging stage factor “delays at port of discharge.” This paper also proposes risk management strategies on the basis of the experts’ recommendations, and its findings can provide shipowners and charterers with a reference for the drafting of risk clauses when entering into a charter party.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robust optimization method of emergency resource allocation for risk management in inland waterways 内河航道风险管理应急资源分配的稳健优化方法

IF 1.8 4区工程技术

Brodogradnja Pub Date : 2024-01-01 DOI: 10.21278/brod75103

Quandang Ma

{"title":"Robust optimization method of emergency resource allocation for risk management in inland waterways","authors":"Quandang Ma","doi":"10.21278/brod75103","DOIUrl":"https://doi.org/10.21278/brod75103","url":null,"abstract":"This study proposes a robust optimization method for waterborne emergency resource allocation in inland waterways that addresses the uncertainties and mismatches between supply and demand. To accomplish this, we integrate the risk evaluation of maritime with a robust optimization model and employ the Entropy Weighted Method (EWM)-Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)-Analytic Hierarchy Process (AHP) method to evaluate the risk of various areas. The approach enables exploration of the relationship between maritime risk and emergency resource allocation strategy. The robust optimization method is used to deal with uncertainty and derive the robust counterpart of the proposed model. We establish an emergency resource allocation model that considers both the economy and timeliness of emergency resource allocation. We construct an optimization model and transform it into an easily solvable robust counterpart model. The results demonstrate that the proposed method can adapt to real-world scenarios, and effectively optimize the configuration effect while improving rescue efficiency under reasonable resource allocation. Specifically, the proportion of rescue time saved ranges from 28.52% to 92.60%, and the proportion of total cost saved is 95.82%. Our approach has significant potential to provide a valuable reference for decision-making related to emergency resource allocation in maritime management.","PeriodicalId":55594,"journal":{"name":"Brodogradnja","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0