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Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding最新文献

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Some appreciations concerning the performance indicators of the maritime ship repairs shipyards 对海船修船厂业绩指标的几点评价
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.10
E. Manea
{"title":"Some appreciations concerning the performance indicators of the maritime ship repairs shipyards","authors":"E. Manea","doi":"10.35219/annugalshipbuilding.2019.42.10","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.10","url":null,"abstract":"An organization, to effectively use the information obtained from measuring performance, has to make the transition from measuring range to analysis and decision, which represents performance management. This offers the possibility for the performance indicators measurements analysis, which helps define the major objectives of the organization, on different terms and main ways of achieving them, together with the resources allocated to achieve a competitive advantage in the field. The performance indicators can be strategic, managerial and operational, measuring three components - business, profitability and productivity. The results monitor the activities performed and costs incurred, constituting the standard measure that allows to examine and highlight strategies for sustainability objectives achievement. The paper presents a series of personal observations and comments regarding performance indicators - as a result of its author’s professional experience - and leads to the conclusion that the options for a performance-oriented shipyard strategy should be developed based on its own business characteristics through the following: agresive marketing – low costs; strategic alliance with the equipment suppliers - differentiating services; orientation towards a particular ships market segment – focusing.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69960502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Statistical properties of the yield strength of normal strength hull structural steel plates 标准强度船体结构钢板屈服强度的统计特性
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.08
Z. Sekulski
{"title":"Statistical properties of the yield strength of normal strength hull structural steel plates","authors":"Z. Sekulski","doi":"10.35219/annugalshipbuilding.2019.42.08","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.08","url":null,"abstract":"The statistical properties were studied of normal strength hull structural steel plates (with a strength level of 235) of a thickness of £ 50 mm that were manufactured in 1990-1991 at four European steelworks. The study focused on the yield strength, as the available literary sources indicate that in terms of structural strength and design assessment this particular aspect is the most essential property of steel used for ship structures, and at the same time its values are characterized by the highest variability. Detailed statistical tests were performed on nearly 2,200 plates. The results of these analyses suggested that for the sample examined herein the mean yield strength value was 308.3 MPa, the standard deviation was 25.24 MPa, the coefficient of variation was 0.0819 (8.19%), the (average) difference bias was 73.3 MPa and the (average) ratio bias was 1.31. It has been shown that both lognormal distribution LN(5.7276, 0.0817) and normal distribution N(308.2589, 25.2444) provide an adequate representation of normal strength hull structural steel plates .","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The mesh influence in fluid flow 网格对流体流动的影响
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.02
L. Galateanu, M. Baciu, A. Pohilca, C. Mocanu, Dunărea de Jos
{"title":"The mesh influence in fluid flow","authors":"L. Galateanu, M. Baciu, A. Pohilca, C. Mocanu, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.02","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.02","url":null,"abstract":"The principal objective of this study is to adapting the mesh of the computational fluid dynamics to obtain a good accuracy. In the past, the experimental results were a good bench-mark for predicting ship water resistance, but due to the evolution of the technol-ogy, mathematical flow patterns can be solved by applying the RANS equations. The towing test results can by apply for a low Froude number, but for a high Froude number, all phenomena that appear along the simulation aren’t relevant because the scale effects can provide a realist vision of the phenomena for a real ship (scale 1:1). Hence, this study presents methods of improving the mesh quality by making comparisons with the experimental tests, and also presents the limit of the towing test results.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69960131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Theoretical and experimental investigation of a catamaran resistance 双体船阻力的理论与实验研究
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.06
D. Obreja, G. Iatan, Dunărea de Jos
{"title":"Theoretical and experimental investigation of a catamaran resistance","authors":"D. Obreja, G. Iatan, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.06","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.06","url":null,"abstract":"A comparative theoretical and experimental analysis over catamaran resistance was developed in this paper. The theoretical estimation was performed on the basis of Sahoo method, typical for the round bilge catamarans with high speed. Experimental model tests were developed in the Towing Tank of “Dunarea de Jos” University of Galati, both with the demihull and the full catamaran, with blocked sinkage and trim, to study the influence of the hulls interference. Also, catamaran model tests with free trim were realized. In order to transpose the model results at full scale, the ITTC 1957 method was applied. The conclusions reveal significant differences between the theoretical and experimental results.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Control of welding deformation in thin plate 薄板焊接变形控制
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.17
Muhammad Taha Ali, Renardo-Florin Teodor, Dunărea de Jos
{"title":"Control of welding deformation in thin plate","authors":"Muhammad Taha Ali, Renardo-Florin Teodor, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.17","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.17","url":null,"abstract":"Welding is a process to join metals with different arrangements of the plates. In the shipbuilding industry, the joining of plates in such a way as to ensure higher productivity is very important, but the industry has been facing the problem of deformation for seven decades. The shipbuilding industry is trying to control this problem, but thin plates bring non-linear problems in the structure, especially in the bulkhead of the structure that leads to more deformation due to small members of the profiles. This problem occurs in the construction of yachts because clients need good outlook of the ship. To control this problem the computational analysis is the more productive method than other to solve this deformation problem. The thermal elastic plastic FEM method is used to analyse the thermal and mechanical problems. This analysis confirmed that this TEP – Finite Element Method is applicable for the control of deformation in the thin plate.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Strength assessment in oblique design waves for a Europe B2 1740T river barge type 欧洲B2 1740T河驳船斜设计波强度评估
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.04
L. Domnișoru, Dunărea de Jos
{"title":"Strength assessment in oblique design waves for a Europe B2 1740T river barge type","authors":"L. Domnișoru, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.04","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.04","url":null,"abstract":"The operation limits of a Europe B2 1740T barge have to be evaluated by several safety criteria. A practical approach is based on the global strength criteria evaluation by equivalent beam barge model and equivalent rules waves, with several heading angle cases. There are considered the Danube river navigation conditions and eventually a costal route, too. The barge is considered with three loading cases and the numerical analyses are done by P_QSW eigen program. The numerical results, hull beam sectional efforts, are evaluated by shipbuilding rules global strength criteria and the allowed operation conditions are obtained.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
On the influences of loading cases and inertial characteristics on the behaviour of a floating crane 载荷情况和惯性特性对浮式起重机性能的影响
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.22
P. Paşcu, L. Crudu
{"title":"On the influences of loading cases and inertial characteristics on the behaviour of a floating crane","authors":"P. Paşcu, L. Crudu","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.22","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.22","url":null,"abstract":"The evaluation of the dynamics of floating structures has to be investigated in order to define the operational index which is reflecting the ability to operate at certain sea state. The applications have been performed for a floating crane using a range of operational loading cases and sea states in the Black Sea coastal area. The influence of the way to evaluate the moments of inertia for the different loading cases is also systematically taken into account. The conclusions are formulated based on the comparative diagrams, incorporating the influences of the above mentioned parameters.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47467728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The calculation of pipeline network comprising pressure reduction valve (PRV) with Q-equation 用q -方程对含减压阀的管网进行了计算
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.07
A. Ioan, Dunărea de Jos
{"title":"The calculation of pipeline network comprising pressure reduction valve (PRV) with Q-equation","authors":"A. Ioan, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.07","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.07","url":null,"abstract":"The calculation of pipeline networks with Q- equations involves the determination of flow rates of liquid flowing through pipes by solving the system of equations comprising the mass conservation equation and the energy conservation equations written along the loops and pseudo-loops. The paper presents an application that solves a network comprising a PRV (Pressure reduction valve). In case of mounting a PRV in the device it takes place a leap of energy and energy conservation equation along a loop is no longer valid. The literature recommends fitting a fictitious tank instead of the device and writing the energy conservation equation in the pseudo-loop.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical analysis using CFD methods of flowing around trimaran hull 三体船船体绕流CFD数值分析
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.15
M. Baciu, L. Galatanu, C. Mocanu, R. Bidoae, Dunărea de Jos
{"title":"Numerical analysis using CFD methods of flowing around trimaran hull","authors":"M. Baciu, L. Galatanu, C. Mocanu, R. Bidoae, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.15","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.15","url":null,"abstract":"In order to reduce the pollution caused by the expanding economy, solutions are sought to find new forms of energy instead of the one based on the burning of fossil fuels. In this context, the Nordic countries (Sweden, Denmark, the Netherlands, England, Norway) use the wind as a source of electricity generation. Thus, in the North Sea of the European continent, \"windmills\" appeared, which, through the generators, are coupled to a system of pale energy production. These complex installations are installed in large winds with strong winds that produce waves with high heights and short periods. Vessels that service these complicated installations must respond to safe sailing requirements for maintenance personnel and transported equipment. Since classical ships do not exactly fit these requirements, they look for forms of hulls that give good behavior to such large ones. In the paper, the Trimaran type ship is approached, using the CFD numerical methods, the shape of the bodies as well as the distance between the bodies so that the ship's behavior meets the safety requirements of the offshore installation.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Noise onboard 9000 cbm oil tanker 9000立方米油轮上的噪音
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2018-12-31 DOI: 10.35219/ANNUGALSHIPBUILDING.2018.41.21
I. Bosoanca, Dunărea de Jos
{"title":"Noise onboard 9000 cbm oil tanker","authors":"I. Bosoanca, Dunărea de Jos","doi":"10.35219/ANNUGALSHIPBUILDING.2018.41.21","DOIUrl":"https://doi.org/10.35219/ANNUGALSHIPBUILDING.2018.41.21","url":null,"abstract":"The paper shows the noise levels in cabins or work places for seafarers. The measured values are compared with the Marine Safety Committee acceptable limits, revised by MSC 337(91) CODE ON NOISE LEVELS ONBOARD SHIP for a better acoustic comfort, both for crew and passengers. The results obtained from measurements in sea trials, showed some consistent exceeding of the limit values in certain spaces which could be avoided if a noise prediction for this ship would be provided early in design stage of vessels.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69959778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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