发布求助
文献互助 智能选刊 最新文献

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

筛选
英文 中文
A comparative evaluation of the behaviour of some typical floating offshore structures 几种典型海上浮式结构物性能的比较评价
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.13
L. Crudu, O. Marcu, Diana Donose, Dunărea de Jos, Damen Shipyards Galati
{"title":"A comparative evaluation of the behaviour of some typical floating offshore structures","authors":"L. Crudu, O. Marcu, Diana Donose, Dunărea de Jos, Damen Shipyards Galati","doi":"10.35219/annugalshipbuilding.2019.42.13","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.13","url":null,"abstract":"It is commonly accepted that, during the design process, the characteristics of the location play a major influence leading to the design wave principle. In fact, as compared to ship design process, in case of offshore structures including the ship shaped ones, conceptual design plays a decisive role regarding the capability to safely operate at zero speed on locations in order to reach a high operational index in rough seas. This is directly linked to the limits of the accelerations due to body behaviour in waves which are clearly stated related to the comfort on board corresponding to different types of activities (intellectual work, manual work etc.). On the other hand, the above mentioned restrictions and the operational limits related to the body motions amplitudes, need to be considered. Consequently, the body geometry as well as the masses distribution solutions is mandatory to be carefully evaluated taking also into account the direct influences on the induced structural loads. To this purpose, a comparative evaluation of the Response Amplitude Operators (RAO’s) has been performed for six different bodies consisting in an AHTS ship, a floating crane, a semisubmersible and a group of three pipe laying vessels. The results presented in the paper could be useful when future development of activities on a certain location is envisaged providing quantitative data as well as qualitative ones, giving reliable information depending on the geometry and mass distribution.","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":"48459439","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
Seaway and Octopus as a study tools for ship motions 海道和章鱼作为研究船舶运动的工具
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.09
M. Manea
{"title":"Seaway and Octopus as a study tools for ship motions","authors":"M. Manea","doi":"10.35219/annugalshipbuilding.2019.42.09","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.09","url":null,"abstract":"The engineers are interested in the theoretical and practical ways by which, in the activity of design, construction and operation of the ship, the complications generated by the sea waves can be overcome. The paper presents some examples regarding the possibilities of com-puter-assisted study of characteristics that define the behaviour of the ship under navigational conditions (linear and angular amplitudes of movements, energy spectre of response to different positions of the ship in relation to the incident waves). The study, carried out for a container vessel, took into account the different operating speeds of the ship and rudder angles. Was used features offered by two tools for modelling and simulation - OCTOPUS and SEAWAY - software that allows the study of the computerized behaviour of the ship on the waves in the real navigational conditions. Program library was used for both the ship and navigation environment (modelled using Jonswap energy spectrum).","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":"69959820","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
Retrofitting of Danube vessels for a green and efficient fleet 改造多瑙河船只，打造绿色高效的船队
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.24
C. Angheluță, S. Perijoc, A. Presură
{"title":"Retrofitting of Danube vessels for a green and efficient fleet","authors":"C. Angheluță, S. Perijoc, A. Presură","doi":"10.35219/annugalshipbuilding.2019.42.24","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.24","url":null,"abstract":"The following paper presents a research study based on the idea of reducing the environmental impact of inland waterway vessels by resorting to state-of-the-art technologies for treating the exhaust gases. The paper summarizes an analysis into the feasibility of retrofitting existing ships so as to comply with Stage V, the latest emission norms of the European Commission. Several types of river pushers were analyzed for the case study in order to reach a proper understanding of the implications of installing a new engine and after treatment system. The solutions proposed by engine manufacturers for compliance with the norms were analyzed and suitable engines were identified for the selected vessels, with the goal being to minimize the modifications required on-board. Based on the information obtained, a detailed analysis into the structural, piping, machinery, outfitting and electrical impact was made.","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":"69960383","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
On 3D-FEM analysis of a 9000 tdw tanker global eigen vibration modes 9000 tdw油轮整体本征振动模态的三维有限元分析
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.06
D. Perijoc, Dumitru Silviu, L. Domnișoru, Dunărea de Jos
{"title":"On 3D-FEM analysis of a 9000 tdw tanker global eigen vibration modes","authors":"D. Perijoc, Dumitru Silviu, L. Domnișoru, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.06","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.06","url":null,"abstract":"Identifying a vessel global eigen vibration modes during early stages of the design process is necessary, as it allows the prediction of special phenomena such as springing, whipping or other different resonance conditions, that can lead to an uncomfortable working environment or in extreme cases even damage of the structure or equipment’s. An advance approach for assessing the ships’ eigen vibration characteristics is based on the 3D-FEM method. This research is focused to analyse the eigen global vibration frequencies, for vertical, horizontal, and torsion modes, of a 9000 tdw tanker, pointing out the influence of the surrounding water by hydrodynamic added masses formulation.","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":"69959807","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
Small ships hydrodynamics software platform 小型船舶流体力学软件平台
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.01
D. Obreja, Dunărea de Jos
{"title":"Small ships hydrodynamics software platform","authors":"D. Obreja, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.01","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.01","url":null,"abstract":"The hydrodynamics performances prediction of the small ships represents an important issue in the initial design stage. The Preliminary Hydrodynamics Performances (PHP) software platform was realised in the Research Centre of the Naval Architecture Faculty in “Dunarea de Jos” University of Galati, in order to calculate the ship resistance, powering and manoeuvring performances of the small ships. The description of the most important software modules and corresponding theoretical aspects is presented in this paper. The software platform is used for the didactical applications and research activities dedicated to the estimation of the hydrodynamics performances of the small ships, in the preliminary design stage .","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":"69960080","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
Global strength analysis for a split hopper barge subject to head equivalent design wave 船首等效设计波作用下裂斗驳船整体强度分析
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.04
L. Moise, Costică Hogaș, L. Domnișoru, C. Mocanu, Dunărea de Jos
{"title":"Global strength analysis for a split hopper barge subject to head equivalent design wave","authors":"L. Moise, Costică Hogaș, L. Domnișoru, C. Mocanu, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.04","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.04","url":null,"abstract":"Due to the Classification Societies’ regulations, in the preliminary design stage for new ship constructions it is necessary to prove with calculations that the stress and deformation distributions in the ship structure do not exceed the stress limit values, regardless the sea state such as calm water, sagging or hogging wave conditions. Normally, it is consid-ered that the hogging and sagging conditions are the worst head wave conditions, when the vertical shear forces and bending moments can reach high values and the risk of ship structure collapse can be high. The main purpose of this study is to assess, using the Finite Element Method (FEM), the global strength for a split hopper barge in three sea state conditions: calm water, hogging and sagging head design waves.","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":"69960236","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
Wing body junctions in ship hydrodynamics 船舶流体力学中的翼身连接
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.19
C. Ungureanu, C. Mocanu, Dunărea de Jos
{"title":"Wing body junctions in ship hydrodynamics","authors":"C. Ungureanu, C. Mocanu, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.19","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.19","url":null,"abstract":"Starting with First of January 2013 all ships greater than 400 gross tons must comply with design or operational energy efficiency index, in order to reduce the greenhouse emissions. From naval architect point of view the emission reduction measures can be hydrodynamic, structural, technological and operational. The hydrodynamic measures which are the first that can be taken into consideration in order to reduce the EEDI are materialized through the optimization of the hull. The Naval Architect may interfere on the bulbous bow, hydrodynamic shoulders, bulb stern, transom or appendages, the drag being then modified by reducing the wave, viscous pressure or frictional resistance com-ponents. Other way to improve the hydrodynamics of a ship is the using of the Energy Saving Devices (ESD). These are appendages mounted on the ship hull developed to improve the flow near the propeller who operates in non-uniform wake field of ship. The flow mechanism around ESD’s resumes as wing-body juncture flow problems and due to their application to the ship appendage flow, recently, they have received much attention in ship hydrodynamics. Despite its simple geometric configuration the wing-body junction flow is a very complicate flow due to the so-called horseshoe vortex system determined by the adverse pressure gradient induced by the presence of the obstacle and the three di-mensional boundary layer separations around the junction. The horseshoe vortex flow affects the drag, lift and causes a persistent lack of uniformity in the wake and is also considered as one source of the noises, vibration and unsteady inflow for the propeller.","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":"69960593","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
"Technical aspects of wave-generators systems Wec: wave energy converters" 波浪发生器系统的技术方面Wec:波浪能转换器
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.17
A. Maimon, Dunărea de Jos
{"title":"\"Technical aspects of wave-generators systems Wec: wave energy converters\"","authors":"A. Maimon, Dunărea de Jos","doi":"10.35219/annugalshipbuilding.2019.42.17","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.17","url":null,"abstract":"The main purpose of this article is to point out the actual progress on wave energy con-verters by stressing their differences of construction in all their main parts and by indicat-ing their main working principle as well as their installation characteristics. Resulting from the effect of wind on marine surfaces (the power of the waves is substantially proportional to the power of the wind speed), the wave energy is a net availability of 1 to 5% of the world's annual electricity demand. Recoverable energy could reach up to 2000TWh/year with more efficient conversion systems. However, it is necessary to consider the relatively low conversion efficiency (of the order of 10% on annual averages) of the current recovery systems.","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":"69960476","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
Various aspects of the exploitation of marine current energy with tidal turbines 利用潮汐涡轮机开发海流能源的各个方面
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.18
A. Maimon
{"title":"Various aspects of the exploitation of marine current energy with tidal turbines","authors":"A. Maimon","doi":"10.35219/annugalshipbuilding.2019.42.18","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.18","url":null,"abstract":"The main purpose of this paper is to present a short review of the actual progress on the tidal energy and on the tidal energy convertors: turbines, dam systems, oscillating wings and their operation characteristics. The energy of the oceans: the tides, the waves, the difference of osmotic pressure between the fresh water and that of the oceans, the thermal gradient in the depths of the oceans, the sea currents, represents a huge reservoir of electricity estimated at an annual production of 120.000 TWh. The energy of the tides could provide a lot of electricity, but a power station of this type causes damage to the environment of the estuary where it is built and to its wild life because it prevents the passage of fish. Tidal turbines could be an alternative solution in environment protection.","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":"69960579","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
Aspects of using 3-D laser scanning technology in ship retrofit projects 三维激光扫描技术在船舶改造工程中的应用
Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding Pub Date : 2019-11-26 DOI: 10.35219/annugalshipbuilding.2019.42.21
Vasile Rață, Steluta Secobeanu
{"title":"Aspects of using 3-D laser scanning technology in ship retrofit projects","authors":"Vasile Rață, Steluta Secobeanu","doi":"10.35219/annugalshipbuilding.2019.42.21","DOIUrl":"https://doi.org/10.35219/annugalshipbuilding.2019.42.21","url":null,"abstract":"The number of ship retrofit and conversion projects has increased dramatically over the last couple of years, mainly as a result of new international regulations to limit environment pollution. Another driver has been conversion of oil tankers into floating production, storage and offloading (FPSO) vessels as offshore oil and gas production has moved into deeper waters. The need to accurately establish the existing location of equipment and systems onboard ships prior to a retrofit project has lead to an increasing use of 3-D laser scanning. This technology brings benefits as it increases the accuracy of the retrofit design and associated production information and it shortens the time needed for the onboard survey. The paper describes the laser 3-D technology and compares the time allocated to the classical practice of collecting input data onboard of ships with 3-D laser scanning activity, based on review of records from several onboard scanning and subsequent retrofit projects.","PeriodicalId":33188,"journal":{"name":"Annals of Dunarea de Jos University of Galati Fascicle XI Shipbuilding","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48516234","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
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信