{"title":"Lateral Oscillation of an Ascending Anchor Chain","authors":"S. Tanaka, N. Hirata, K. Handa, H. Seki","doi":"10.2534/JJASNAOE.13.249","DOIUrl":"https://doi.org/10.2534/JJASNAOE.13.249","url":null,"abstract":"","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127692304","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}
{"title":"Response of Cylindrical Floating Structure Subjected to an Underwater Explosion","authors":"A. Imakita, A. Yasuda","doi":"10.2534/JJASNAOE.6.379","DOIUrl":"https://doi.org/10.2534/JJASNAOE.6.379","url":null,"abstract":"","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132214266","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}
N. Fukuchi, Kousaku Izumi, Changhong Hu, Kohei Tanaka
{"title":"A Study on Diffusing Aspect and Ventilation of Metallic Fume for Improvement of Working Environment in a Fabrication Shop","authors":"N. Fukuchi, Kousaku Izumi, Changhong Hu, Kohei Tanaka","doi":"10.2534/JJASNAOE.1.85","DOIUrl":"https://doi.org/10.2534/JJASNAOE.1.85","url":null,"abstract":"","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125301263","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 : 2002-11-01DOI: 10.2534/JJASNAOE1968.2001.190_107
R. Miyake, T. Zhu, H. Kagemoto
{"title":"On the Estimation of Wave-Induced Loads Acting on Practical Merchant Ships by a Rankine Source Method(Part1, Strength Assessment of Double Hull Tankers)","authors":"R. Miyake, T. Zhu, H. Kagemoto","doi":"10.2534/JJASNAOE1968.2001.190_107","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2001.190_107","url":null,"abstract":"","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"51 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116830505","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}
It is said that the horse power of recent marine propulsion diesel engine corresponding to their ship's sizes has been reduced comparing with former ones. In transient operational condition, such engines with reduced power tend to work to the utmost of their power due to relatively enlarged inertia force of ships. Such being the case, it might be necessary for reconsideration of nowaday practice of design of propulsion system in view of strength. To meet this possible demands, the measuring have been made concerning to the torque acting on actual ship's propulsion shaftings. Through the measurement unexpected increases of the maximum torque from the normal value were observed during ship's crash astern operation, the increase rates of which spread out up to 1.6. In this paper, we will report the measuring results with additional breif study on the behaviour of propulsion diesel in transient condition.
{"title":"SOME CONSIDERATION FOR THE BEHAVIOR OF PROPULSION DIESEL ENGINE IN TRANSIENT CONDITION.","authors":"M. Takagi, S. Sasaki","doi":"10.5988/JIME1966.30.651","DOIUrl":"https://doi.org/10.5988/JIME1966.30.651","url":null,"abstract":"It is said that the horse power of recent marine propulsion diesel engine corresponding to their ship's sizes has been reduced comparing with former ones. In transient operational condition, such engines with reduced power tend to work to the utmost of their power due to relatively enlarged inertia force of ships. Such being the case, it might be necessary for reconsideration of nowaday practice of design of propulsion system in view of strength. To meet this possible demands, the measuring have been made concerning to the torque acting on actual ship's propulsion shaftings. Through the measurement unexpected increases of the maximum torque from the normal value were observed during ship's crash astern operation, the increase rates of which spread out up to 1.6. In this paper, we will report the measuring results with additional breif study on the behaviour of propulsion diesel in transient condition.","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121693990","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 : 1900-01-01DOI: 10.2534/JJASNAOE1968.2000.188_545
Tatsuhiro Suzuki, M. Arai, Taito Shimizu
In this paper, the applicability of response surface methodology (RSM) to the design of ship structures is examined. One of the principal features of RSM is to rationally minimize the number of response evaluations by using the technique of experimental design. RSM also allows easy estimation of the change of response associated with the change of the design parameters on the obtained response surface. This is particularly effective in ship structural designs wherein trade-offs between design parameters are everyday occurrences. However, before RSM is applied to the actual design, the degree of the approximate polynomial equation that represents the response surface, and the necessary number of response evaluations, etc., must be examined. Thus, the optimization of the transverse bulkhead structure of a crude oil tanker is performed as an example of the application of RSM, wherein the method's effectiveness together with the results of above-mentioned basic examinations are shown.
{"title":"ON THE APPLICATION OF RESPONSE SURFACE METHODOLOGY TO THE OPTIMIZATION OF SHIP STRUCTURAL DESIGN.","authors":"Tatsuhiro Suzuki, M. Arai, Taito Shimizu","doi":"10.2534/JJASNAOE1968.2000.188_545","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2000.188_545","url":null,"abstract":"In this paper, the applicability of response surface methodology (RSM) to the design of ship structures is examined. One of the principal features of RSM is to rationally minimize the number of response evaluations by using the technique of experimental design. RSM also allows easy estimation of the change of response associated with the change of the design parameters on the obtained response surface. This is particularly effective in ship structural designs wherein trade-offs between design parameters are everyday occurrences. However, before RSM is applied to the actual design, the degree of the approximate polynomial equation that represents the response surface, and the necessary number of response evaluations, etc., must be examined. Thus, the optimization of the transverse bulkhead structure of a crude oil tanker is performed as an example of the application of RSM, wherein the method's effectiveness together with the results of above-mentioned basic examinations are shown.","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128565383","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 : 1900-01-01DOI: 10.2534/JJASNAOE1968.1994.176_481
M. Yuasa, Tomio Watanabe
This paper summarises results of an appraisal of measured corrosion data of a hull structure obtained through periodical surveys, corrosion tests of specimens of various welded joints, fatigue tests and stress analysis of corroded specimens. Statistical analysis of pitting corrosion on the bottom plate of oil tankers was carried out with good results. It was also found that tank cleaning has a considerable effect on the progress of pitting corrosion. Data of plate thickness on the lower part of side frames of bulk carriers was appraised by two parameters, the initiation life and progress rate of corrosion wastage. Results showed that the progress rate of corrosion wastage was larger than conventional numerals. A corrosion test of welded joint specimen was carried out under the cycles of sea water and air. Grooving corrosion had initiated at the weld toe of butt joints. The cause of grooving corrosion was presumed to be due to the difference of corrosion potential between HAZ and base metal/weld metal of the specimen. Tensile fatigue test and stress analysis of corroded specimens was carried out. The results were examined as to the relation of fatigue strength and stress concentration factor. It was confirmed that in butt joints, the stress concentration factor was increased by corrosion and fatigue strength was reduced. In a cruciform joint, the factor was nearly unchanged and the fatigue strength was hardly reduced.
{"title":"FATIGUE STRENGTH OF CORRODED WELD JOINTS","authors":"M. Yuasa, Tomio Watanabe","doi":"10.2534/JJASNAOE1968.1994.176_481","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.1994.176_481","url":null,"abstract":"This paper summarises results of an appraisal of measured corrosion data of a hull structure obtained through periodical surveys, corrosion tests of specimens of various welded joints, fatigue tests and stress analysis of corroded specimens. Statistical analysis of pitting corrosion on the bottom plate of oil tankers was carried out with good results. It was also found that tank cleaning has a considerable effect on the progress of pitting corrosion. Data of plate thickness on the lower part of side frames of bulk carriers was appraised by two parameters, the initiation life and progress rate of corrosion wastage. Results showed that the progress rate of corrosion wastage was larger than conventional numerals. A corrosion test of welded joint specimen was carried out under the cycles of sea water and air. Grooving corrosion had initiated at the weld toe of butt joints. The cause of grooving corrosion was presumed to be due to the difference of corrosion potential between HAZ and base metal/weld metal of the specimen. Tensile fatigue test and stress analysis of corroded specimens was carried out. The results were examined as to the relation of fatigue strength and stress concentration factor. It was confirmed that in butt joints, the stress concentration factor was increased by corrosion and fatigue strength was reduced. In a cruciform joint, the factor was nearly unchanged and the fatigue strength was hardly reduced.","PeriodicalId":448463,"journal":{"name":"ClassNK technical bulletin","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130417221","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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