Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.13
L. Crudu, O. Marcu, Diana Donose, Dunărea de Jos, Damen Shipyards Galati
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.09
M. Manea
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).
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.24
C. Angheluță, S. Perijoc, A. Presură
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.06
D. Perijoc, Dumitru Silviu, L. Domnișoru, Dunărea de Jos
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.01
D. Obreja, Dunărea de Jos
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 .
小型船舶的水动力性能预测是设计初期的一个重要问题。初步流体动力学性能(PHP)软件平台是在加拉蒂大学“Dunarea de Jos”造船学院研究中心实现的，目的是计算小型船舶的船舶阻力、动力和操纵性能。本文对系统中最重要的软件模块和相应的理论方面进行了描述。该软件平台用于教学应用和研究活动，致力于在初步设计阶段估计小型船舶的水动力性能。
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.04
L. Moise, Costică Hogaș, L. Domnișoru, C. Mocanu, Dunărea de Jos
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.19
C. Ungureanu, C. Mocanu, Dunărea de Jos
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.17
A. Maimon, Dunărea de Jos
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.18
A. Maimon
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.
{"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}
Pub Date : 2019-11-26DOI: 10.35219/annugalshipbuilding.2019.42.21
Vasile Rață, Steluta Secobeanu
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.
{"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}
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