Pub Date : 2000-12-01DOI: 10.2534/JJASNAOE1968.2002.169
Y. Okumoto, Koji Nakamagoe, Shigeo Inoue, O. Baba
Though the physical burdens by welding works and manual material handling works in the shipbuilding have been studied before, the grinding work will be one of the most severe work for the human body. In the grinding work, undesired sound, hand-arm vibration and reaction force from the tool are big, and the adequate countermeasures for the body work seem to be necessary, because the aging of the workers and embrittlement of the youth will become remarkable in near future. Therefore, in this paper, the human body analysis at grinding work has been carried out, using general-purpose human simulation software “Jack”; static strength prediction of human body, lumbar force analysis, and energy consumption analysis, same as previous reports.This time, “Kansei Engineering” technique has been introduced for the evaluation of the results by biomechanical analysis. SD (Semantic Differential) evaluation has been carried out concerning the body feeling of the grinding workers, and then multiple factor analysis, one of multivariate analysis, has been executed, according to the process of “Kansei Engineering”. The results have been compared with the analytical results by the digital human model, and it was concluded that both were well coincided especially for the lower human body.
{"title":"Study of Workability and Safety Using Virtual Human Model","authors":"Y. Okumoto, Koji Nakamagoe, Shigeo Inoue, O. Baba","doi":"10.2534/JJASNAOE1968.2002.169","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.169","url":null,"abstract":"Though the physical burdens by welding works and manual material handling works in the shipbuilding have been studied before, the grinding work will be one of the most severe work for the human body. In the grinding work, undesired sound, hand-arm vibration and reaction force from the tool are big, and the adequate countermeasures for the body work seem to be necessary, because the aging of the workers and embrittlement of the youth will become remarkable in near future. Therefore, in this paper, the human body analysis at grinding work has been carried out, using general-purpose human simulation software “Jack”; static strength prediction of human body, lumbar force analysis, and energy consumption analysis, same as previous reports.This time, “Kansei Engineering” technique has been introduced for the evaluation of the results by biomechanical analysis. SD (Semantic Differential) evaluation has been carried out concerning the body feeling of the grinding workers, and then multiple factor analysis, one of multivariate analysis, has been executed, according to the process of “Kansei Engineering”. The results have been compared with the analytical results by the digital human model, and it was concluded that both were well coincided especially for the lower human body.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"32 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477498","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_11
C. Kawakita, S. Takano
The influence of streamwise pressure gradients and curved surfaces on microbubble skin friction reduction was examined in cavitation tunnel at free-stream speeds of 5, 7 and 10m/sec. A 1.5m long, 0.3m width flat plate and 2D convex model were used. In order to change streamwise pressure gradient, using temporary slopping bottom changed sectional area at the test section.The effect of skin friction reduction under favorable pressure gradients tended to rather reduce compared with the zero pressure gradient case. In opposition, the adverse pressure gradients tended to rather increase. Moreover, there was a condition that the skin friction reduction effect increased extremely under the adverse pressure gradient. Air bubbles under that condition looked like cloud and the void fraction of inner layer was high. There seems to be possible to find an effective microbubble method by the optimization with air bubble diameter and distribution.
{"title":"Microbubble Skin Friction Reduction under the Influence of Pressure Gradients and Curved Surface","authors":"C. Kawakita, S. Takano","doi":"10.2534/JJASNAOE1968.2000.188_11","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_11","url":null,"abstract":"The influence of streamwise pressure gradients and curved surfaces on microbubble skin friction reduction was examined in cavitation tunnel at free-stream speeds of 5, 7 and 10m/sec. A 1.5m long, 0.3m width flat plate and 2D convex model were used. In order to change streamwise pressure gradient, using temporary slopping bottom changed sectional area at the test section.The effect of skin friction reduction under favorable pressure gradients tended to rather reduce compared with the zero pressure gradient case. In opposition, the adverse pressure gradients tended to rather increase. Moreover, there was a condition that the skin friction reduction effect increased extremely under the adverse pressure gradient. Air bubbles under that condition looked like cloud and the void fraction of inner layer was high. There seems to be possible to find an effective microbubble method by the optimization with air bubble diameter and distribution.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"2000 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131373899","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_387
K. Aoyama, Shoji Takechi, T. Nomoto
The module construction system is established as an efficient production system in a shipyard. Because an efficiency and productivity of the module construction system are depends on block division plans, it is necessary to make proper block plans. A lot of design support systems for shipbuilding have been recently developed, but it seems that there is no effective support system for a block division planning. Therefore, a computer aided block division planning is a problem to be solved for shipbuilding CIM. In order to develop a computer aided block division planning system, this paper introduces a concept of candidate seam and shows that information on joint plays a significant role in block division planning. In this research, a computer aided block division planning system is introduced, and this system gives two processes with user interface;-A block designer specifies information on joint of block seams and distributes structural members to each block to design blocks.- A system generates information on joint at any position at cutting apart designed structural members.- A system proposes some block division plans from specified block seams.Above-mentioned functions for block division planning are implemented into the shipbuilding CIM system of authors. In order to select better division block, this system evaluates designed blocks by using product data and constraints of a facility. A few outputs from the block division planning system is shown in this paper.
{"title":"Basic study on the design support system for construction block on CIM in shipbuilding","authors":"K. Aoyama, Shoji Takechi, T. Nomoto","doi":"10.2534/JJASNAOE1968.2000.188_387","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_387","url":null,"abstract":"The module construction system is established as an efficient production system in a shipyard. Because an efficiency and productivity of the module construction system are depends on block division plans, it is necessary to make proper block plans. A lot of design support systems for shipbuilding have been recently developed, but it seems that there is no effective support system for a block division planning. Therefore, a computer aided block division planning is a problem to be solved for shipbuilding CIM. In order to develop a computer aided block division planning system, this paper introduces a concept of candidate seam and shows that information on joint plays a significant role in block division planning. In this research, a computer aided block division planning system is introduced, and this system gives two processes with user interface;-A block designer specifies information on joint of block seams and distributes structural members to each block to design blocks.- A system generates information on joint at any position at cutting apart designed structural members.- A system proposes some block division plans from specified block seams.Above-mentioned functions for block division planning are implemented into the shipbuilding CIM system of authors. In order to select better division block, this system evaluates designed blocks by using product data and constraints of a facility. A few outputs from the block division planning system is shown in this paper.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115496214","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_127
Y. Inoue, M. R. Islam, M. Murai
by Yoshiyuki Inoue *, Member, M. Rafiqul Islam * M. Murai *, MemberSummary In this paper, the application of three dimensional source technique for computations of motion responses and drift forces for multi-body floating system with zero forward speed in waves are investigated. The mean wave drift forces are obtained by far field and near field (direct pressure integration) methods. Numerical results for the first order motion responses and the mean wavedrift forces for a parallel arrangement of a FPSO (Floating Production Storage and Offloading Unit) and a LNG carrier are discussed. Some comparisons are made for a single floating body (semi-submersible) as well as for a simple multi-body system of a cylindrical body with a box shaped hull. Numerical results for motion responses are compared with experimental ones for the FPSO-LNG system and also results for mean wave drift forces obtained from both of the methods are compared with experimental ones. The trend of the results as well as correlation between both of the methods found to be comparatively well in agreement. The effects of roll damping to the second order wave drift forces for sway and yaw are also discussed.
{"title":"A STUDY ON MOTIONS AND DRIFT FORCES OF A MULTIBODY FLOATING SYSTEM IN WAVES","authors":"Y. Inoue, M. R. Islam, M. Murai","doi":"10.2534/JJASNAOE1968.2000.188_127","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_127","url":null,"abstract":"by Yoshiyuki Inoue *, Member, M. Rafiqul Islam * M. Murai *, MemberSummary In this paper, the application of three dimensional source technique for computations of motion responses and drift forces for multi-body floating system with zero forward speed in waves are investigated. The mean wave drift forces are obtained by far field and near field (direct pressure integration) methods. Numerical results for the first order motion responses and the mean wavedrift forces for a parallel arrangement of a FPSO (Floating Production Storage and Offloading Unit) and a LNG carrier are discussed. Some comparisons are made for a single floating body (semi-submersible) as well as for a simple multi-body system of a cylindrical body with a box shaped hull. Numerical results for motion responses are compared with experimental ones for the FPSO-LNG system and also results for mean wave drift forces obtained from both of the methods are compared with experimental ones. The trend of the results as well as correlation between both of the methods found to be comparatively well in agreement. The effects of roll damping to the second order wave drift forces for sway and yaw are also discussed.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129446661","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_645
H. Yoshinari, S. Aihara
Influence of grain orientation anisotropy (texture) on brittle fracture propagation properties in steel was analyzed based on a fracture mechanics model, which assumes that a crack propagates along the cleavage plane with the highest tensile normal stress among the cleavage planes in a grain. The model predicted the higher degree of zigzag crack path with higher intensity of grain texture. The degree of zigzag crack path was also predicted to increase with increasing crack-tip plasticity. This was explained by the fact that plastic crack-tip stress distribution has less potency of driving the crack direction back to the original crack direction than linear elastic crack-tip stress distribution does. Above results agreed well with observations of Charpy impact fracture surfaces of textured and non-textured steel.
{"title":"Influence of steel texture on brittle crack propagation characteristics","authors":"H. Yoshinari, S. Aihara","doi":"10.2534/JJASNAOE1968.2000.188_645","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_645","url":null,"abstract":"Influence of grain orientation anisotropy (texture) on brittle fracture propagation properties in steel was analyzed based on a fracture mechanics model, which assumes that a crack propagates along the cleavage plane with the highest tensile normal stress among the cleavage planes in a grain. The model predicted the higher degree of zigzag crack path with higher intensity of grain texture. The degree of zigzag crack path was also predicted to increase with increasing crack-tip plasticity. This was explained by the fact that plastic crack-tip stress distribution has less potency of driving the crack direction back to the original crack direction than linear elastic crack-tip stress distribution does. Above results agreed well with observations of Charpy impact fracture surfaces of textured and non-textured steel.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124430127","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_359
Zuogang Chen, Y. Doi
Unsteady viscous flow field around an undulating advancing plate in low Reynolds number range is numerically studied. The main objective is to study the abilities of an undulating plate to produce thrust and achieve higher propulsive efficiency in low Reynolds number range. The Reynolds number based on the oncoming velocity and the plate length is 1000. The flow around an undulating plate is simulated by solving the full 3 D unsteady Navier-Stokes equation in a primitive value formulation. The numerical scheme is based on the MAC method where the Navier-Stokes equation is solved by the time marching method on a body fitted coordinate system.The simulation shows that pressure is acting as thrusting force while frictional force is acting as resistance during the undulating motion. Strouhal number is the most important governing parameter for the propulsive efficiency. The propulsive efficiency is enhanced with the increase of the Reynolds number. The advancing thrust mainly comes from the aft part of the plate and the modification of the plate shape can improve the propulsive efficiency. The present study is expected to be applied for the development of a propulsor for micro-hydro-machine.
{"title":"Numerical Investigation on Propulsion by Undulating Plate","authors":"Zuogang Chen, Y. Doi","doi":"10.2534/JJASNAOE1968.2000.188_359","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_359","url":null,"abstract":"Unsteady viscous flow field around an undulating advancing plate in low Reynolds number range is numerically studied. The main objective is to study the abilities of an undulating plate to produce thrust and achieve higher propulsive efficiency in low Reynolds number range. The Reynolds number based on the oncoming velocity and the plate length is 1000. The flow around an undulating plate is simulated by solving the full 3 D unsteady Navier-Stokes equation in a primitive value formulation. The numerical scheme is based on the MAC method where the Navier-Stokes equation is solved by the time marching method on a body fitted coordinate system.The simulation shows that pressure is acting as thrusting force while frictional force is acting as resistance during the undulating motion. Strouhal number is the most important governing parameter for the propulsive efficiency. The propulsive efficiency is enhanced with the increase of the Reynolds number. The advancing thrust mainly comes from the aft part of the plate and the modification of the plate shape can improve the propulsive efficiency. The present study is expected to be applied for the development of a propulsor for micro-hydro-machine.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124018056","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_507
T. Yao, M. Fujikubo, M. Khedmati
A method of progressive collapse analysis of a ship's hull girder under longitudinal bending developed by the first author is extended in order to take local pressure loads into account. First, the average stress-average strain relationship of the plate elements subjected to combined thrust and lateral pressure is formulated in an analytical manner. Then, based on the equilibrium conditions of forces and bending moments considering the influence of lateral pressure, the average stress-average strain relationship of stiffener elements with attached plating is derived. The proposed analytical procedure is then verified through the comparison of the calculated results with those by the FEM analysis for both plate and stiffener elements. Finally, developed formulations are implemented into the computer code “HULLST”, and the modified code is applied to the analysis of collapse behaviour and ultimate hull girder strength of MV “Energy Concentration.”
{"title":"Progressive Collapse Analysis of a Ship' s Hull Girder under Longitudinal Bending considering Local Pressure Loads","authors":"T. Yao, M. Fujikubo, M. Khedmati","doi":"10.2534/JJASNAOE1968.2000.188_507","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_507","url":null,"abstract":"A method of progressive collapse analysis of a ship's hull girder under longitudinal bending developed by the first author is extended in order to take local pressure loads into account. First, the average stress-average strain relationship of the plate elements subjected to combined thrust and lateral pressure is formulated in an analytical manner. Then, based on the equilibrium conditions of forces and bending moments considering the influence of lateral pressure, the average stress-average strain relationship of stiffener elements with attached plating is derived. The proposed analytical procedure is then verified through the comparison of the calculated results with those by the FEM analysis for both plate and stiffener elements. Finally, developed formulations are implemented into the computer code “HULLST”, and the modified code is applied to the analysis of collapse behaviour and ultimate hull girder strength of MV “Energy Concentration.”","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124197381","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 : 2000-12-01DOI: 10.2534/JJASNAOE1968.2000.188_317
Xiaodong Liu, S. Makino, K. Hanai, S. Sakai
Experiments were carried out in a two-dimensional water flume to measure the elastic deformation and mooring force of a large-scale floating structure under solitary wave. The main purpose of the present study is to investigate the effect of hydroelastic response on the mooring force by changing the thickness and the length of model structures. The results are briefly concluded as follows. Firstly, the fission of a solitary wave under a large-scale floating structure is observed, and the maximum deformation of structure becomes smaller than incident wave height when the fission phenomenon occurs and decreases with the increase of the propagation distance of fissioned waves. Secondly, mooring force increases when flexural rigidity becomes larger for a certain scale of structure. Thirdly, mooring force exists a maximum value in the condition just when fission phenomenon occurs. Fourthly, mooring force can be predicted from provided wave and structure information by the non-dimensionalized parameters defined in this study.
{"title":"Experimental Study on the Mooring Force and the Hydroelastic Effect of a Large-scale Floating Structure under Tsunami","authors":"Xiaodong Liu, S. Makino, K. Hanai, S. Sakai","doi":"10.2534/JJASNAOE1968.2000.188_317","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_317","url":null,"abstract":"Experiments were carried out in a two-dimensional water flume to measure the elastic deformation and mooring force of a large-scale floating structure under solitary wave. The main purpose of the present study is to investigate the effect of hydroelastic response on the mooring force by changing the thickness and the length of model structures. The results are briefly concluded as follows. Firstly, the fission of a solitary wave under a large-scale floating structure is observed, and the maximum deformation of structure becomes smaller than incident wave height when the fission phenomenon occurs and decreases with the increase of the propagation distance of fissioned waves. Secondly, mooring force increases when flexural rigidity becomes larger for a certain scale of structure. Thirdly, mooring force exists a maximum value in the condition just when fission phenomenon occurs. Fourthly, mooring force can be predicted from provided wave and structure information by the non-dimensionalized parameters defined in this study.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131651508","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 : 2000-10-25DOI: 10.2534/JJASNAOE1968.2000.188_633
G. Pirker, Y. Fujimoto, Samudro
A probabilistic model for the evaluation of the corrosion degradation of ship hull members is presented. Emphasis is put to obtain a simple relationship between corrosion depth and service time based on the actual data collected from plate thickness measurements. The corrosion phenomenon is assumed to be the result of two sequential processes: generation of pitting points and progress behaviour of pitting points after their generation. Both processes are treated by the probabilistic method. The proposed model is applied to the collected data of plate thickness measurements of Caraka Jaya ships, and the corrosion behaviour of the ship hull members is evaluated. In the second part of the paper, the effect of corrosion on the longitudinal strength degradation of Caraka Jaya ships is discussed.
{"title":"A simple probabilistic model for corrosion evaluation of a ship's hull","authors":"G. Pirker, Y. Fujimoto, Samudro","doi":"10.2534/JJASNAOE1968.2000.188_633","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_633","url":null,"abstract":"A probabilistic model for the evaluation of the corrosion degradation of ship hull members is presented. Emphasis is put to obtain a simple relationship between corrosion depth and service time based on the actual data collected from plate thickness measurements. The corrosion phenomenon is assumed to be the result of two sequential processes: generation of pitting points and progress behaviour of pitting points after their generation. Both processes are treated by the probabilistic method. The proposed model is applied to the collected data of plate thickness measurements of Caraka Jaya ships, and the corrosion behaviour of the ship hull members is evaluated. In the second part of the paper, the effect of corrosion on the longitudinal strength degradation of Caraka Jaya ships is discussed.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"476 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131676232","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 : 2000-06-01DOI: 10.2534/JJASNAOE1968.2000.41
T. Kinoshita, H. Kagemoto
In the usual linear wave-body interaction problems, the variation of the space-wise mean level of the free-surface is ignored and the free-surface boundary condition is imposed on the calm water-surface level. In some problems, however, the variation of the mean free-surface displacement can be so large that it can no longer be ignored even in a linear theory. In the present paper, the formulation that accounts for such effect is presented. As an example application of the presented formulation, the water-surface displacements associated with an oil recovery ship, part of which consists of a water-way bounded by a shallow bottom plate, are computed and compared with experimental results.
{"title":"On the variation of a mean free-surface level caused by the motion of a floating body","authors":"T. Kinoshita, H. Kagemoto","doi":"10.2534/JJASNAOE1968.2000.41","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.41","url":null,"abstract":"In the usual linear wave-body interaction problems, the variation of the space-wise mean level of the free-surface is ignored and the free-surface boundary condition is imposed on the calm water-surface level. In some problems, however, the variation of the mean free-surface displacement can be so large that it can no longer be ignored even in a linear theory. In the present paper, the formulation that accounts for such effect is presented. As an example application of the presented formulation, the water-surface displacements associated with an oil recovery ship, part of which consists of a water-way bounded by a shallow bottom plate, are computed and compared with experimental results.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128401696","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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