Atsushi Sano, N. Matsubara, Naruyoshi Izumi, M. Fujikubo
Buckling strength of a non-spherical tank in the partially filled condition, which is one of the severest loading conditions in terms of the buckling design of Moss-type LNG tanks, is investigated both experimentally and theoretically. As the first part of the study, an axisymmetric loading condition for an upright tank position is considered. The buckling collapse test of scaled models is performed under the loading condition similar to the partially filled condition. The non-linear FE analyses of the test models are carried out and the results are compared with the test results to verify the accuracy of the imperfection sensitivity obtained by the FE analysis. A method to estimate the reduction factor of the elastic buckling strength due to initial shape imperfection is proposed by introducing a concept of an equivalent toroidal shell analogy and applying the Hutchinson’s solution to the toroidal shell under combined circumferential compression and meridional tension based on the Koiter’s initial post-buckling theory. A simplified method to estimate the elastoplastic buckling strength is also proposed by applying the Mises’s type plastic correction to the estimated elastic buckling strength. The reasonable accuracy of the estimated elastic and elastoplastic buckling strengths is demonstrated through a comparison with the results of scaled model tests and FE analyses.
{"title":"Buckling Strength of a Non-Spherical Tank in the Partially Filled Condition","authors":"Atsushi Sano, N. Matsubara, Naruyoshi Izumi, M. Fujikubo","doi":"10.1115/OMAE2017-61397","DOIUrl":"https://doi.org/10.1115/OMAE2017-61397","url":null,"abstract":"Buckling strength of a non-spherical tank in the partially filled condition, which is one of the severest loading conditions in terms of the buckling design of Moss-type LNG tanks, is investigated both experimentally and theoretically. As the first part of the study, an axisymmetric loading condition for an upright tank position is considered. The buckling collapse test of scaled models is performed under the loading condition similar to the partially filled condition. The non-linear FE analyses of the test models are carried out and the results are compared with the test results to verify the accuracy of the imperfection sensitivity obtained by the FE analysis. A method to estimate the reduction factor of the elastic buckling strength due to initial shape imperfection is proposed by introducing a concept of an equivalent toroidal shell analogy and applying the Hutchinson’s solution to the toroidal shell under combined circumferential compression and meridional tension based on the Koiter’s initial post-buckling theory. A simplified method to estimate the elastoplastic buckling strength is also proposed by applying the Mises’s type plastic correction to the estimated elastic buckling strength. The reasonable accuracy of the estimated elastic and elastoplastic buckling strengths is demonstrated through a comparison with the results of scaled model tests and FE analyses.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123541236","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}
T. Katayama, K. Yamaguchi, Tatsuki Nanami, Jun Umeda, Shohei Ozeki, Masatsugu Soga, Toshio Watanabe
{"title":"Study on Scale Effects of Hydrodynamics around Prismatic Planing Surface by using CFD","authors":"T. Katayama, K. Yamaguchi, Tatsuki Nanami, Jun Umeda, Shohei Ozeki, Masatsugu Soga, Toshio Watanabe","doi":"10.2534/jjasnaoe.36.1","DOIUrl":"https://doi.org/10.2534/jjasnaoe.36.1","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"39 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":"124865547","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}
K. Ikushima, M. Shibahara, Yoshitaka Kawajiri, Yui Okimi, T. Uchida, K. Akita, H. Suzuki, S. Morooka
In this research, the contour method was applied to measure the residual stress distribution of a bead-on-plate specimen. The measured residual stress distribution was compared with those measured by neutron diffraction method and calculated by thermal elastic plastic finite element analysis. As a result, it was found that the residual stress distribution obtained by these three methods are in good agreement. In addition, the equilibrium of reaction force on cut plane was considered in the contour method to measure residual stresses in asymmetric cutting which is assumed in the measurement of real structures. The proposed method was applied to the measurement of the residual stress in the multi-pass welded joint. The measured results indicated that the proposed method can measure the residual stress distribution in multi-pass welded joint in asymmetric test specimen.
{"title":"Practical Measurement of Residual Stresses Using Contour Method","authors":"K. Ikushima, M. Shibahara, Yoshitaka Kawajiri, Yui Okimi, T. Uchida, K. Akita, H. Suzuki, S. Morooka","doi":"10.2534/jjasnaoe.30.123","DOIUrl":"https://doi.org/10.2534/jjasnaoe.30.123","url":null,"abstract":"In this research, the contour method was applied to measure the residual stress distribution of a bead-on-plate specimen. The measured residual stress distribution was compared with those measured by neutron diffraction method and calculated by thermal elastic plastic finite element analysis. As a result, it was found that the residual stress distribution obtained by these three methods are in good agreement. In addition, the equilibrium of reaction force on cut plane was considered in the contour method to measure residual stresses in asymmetric cutting which is assumed in the measurement of real structures. The proposed method was applied to the measurement of the residual stress in the multi-pass welded joint. The measured results indicated that the proposed method can measure the residual stress distribution in multi-pass welded joint in asymmetric test specimen.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"428 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":"126083513","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":"四胴型自動航行船の最適巡回航路に関する研究","authors":"Yutaro Tsurumi, Min-Su Ji, Ryosuke Saga, Y. Nihei","doi":"10.2534/jjasnaoe.37.57","DOIUrl":"https://doi.org/10.2534/jjasnaoe.37.57","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"29 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":"125378857","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}
The Japan Agency for Marine–Earth Science and Technology (JAMSTEC) has been developing “YUMEIRUKA”, an autonomous underwater vehicle (AUV) with a fore X-rudder and an aft X-rudder. The vehicle can change its submersion depth by controlling the pitch angle using the two-sets X-rudder system. It is said that the advantage of X-rudder is that the motion control performance at the time of trouble is excellent. In this paper, the motion control performance of “YUMEIRUKA” having broken X rudders is verified by simulations. LQI controller is adopted to control the motion of the vehicle in simulations.
{"title":"Motion control performance of AUV “YUMEIRUKA” with broken X rudder","authors":"M. Nakamura, T. Hyakudome","doi":"10.2534/jjasnaoe.29.103","DOIUrl":"https://doi.org/10.2534/jjasnaoe.29.103","url":null,"abstract":"The Japan Agency for Marine–Earth Science and Technology (JAMSTEC) has been developing “YUMEIRUKA”, an autonomous underwater vehicle (AUV) with a fore X-rudder and an aft X-rudder. The vehicle can change its submersion depth by controlling the pitch angle using the two-sets X-rudder system. It is said that the advantage of X-rudder is that the motion control performance at the time of trouble is excellent. In this paper, the motion control performance of “YUMEIRUKA” having broken X rudders is verified by simulations. LQI controller is adopted to control the motion of the vehicle in simulations.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"55 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":"122874347","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":"Development of training program for spray coating worker by the utilization of a 3D-VR spray coating simulator","authors":"Shuhei Fujimoto, Tomoyuki Taniguchi","doi":"10.2534/jjasnaoe.34.185","DOIUrl":"https://doi.org/10.2534/jjasnaoe.34.185","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"359 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":"122921534","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":"Theoretical Study on Wave-Induced Pressure and Drift Force on a Vertical Circular Column","authors":"M. Kashiwagi","doi":"10.2534/jjasnaoe.37.37","DOIUrl":"https://doi.org/10.2534/jjasnaoe.37.37","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"27 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":"128488786","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}
T. Murakami, Takaaki Takeuchi, T. Utsunomiya, K. Gotoh
{"title":"Experimental Study on Wear Coefficient of Mooring Chain for Floating Offshore Structures","authors":"T. Murakami, Takaaki Takeuchi, T. Utsunomiya, K. Gotoh","doi":"10.2534/jjasnaoe.34.63","DOIUrl":"https://doi.org/10.2534/jjasnaoe.34.63","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"216 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":"129445318","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":"Research on a Shallow Water Mooring with a Tower-shaped Buoy for a Floating Offshore Wind Turbine","authors":"Hideyuki Suzuki, M. Takaoka","doi":"10.2534/jjasnaoe.36.41","DOIUrl":"https://doi.org/10.2534/jjasnaoe.36.41","url":null,"abstract":"","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"4 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":"130300023","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}
Container ships are becoming larger in order to reduce fuel consumption per unit transportation volume. As the ship size grows, the number of bays in which containers are loaded will increase, and the number of containers per bay will also increase. The loading order of a large number of containers is usually optimized by a computer-aided planning system called a Loading Computer that can comprehensively consider ship stability and cargo handling efficiency. However, due to the increase in the size of ships, the number of ports of call in one voyage and the number of empty containers to be transported also increase, and the container loading patterns are more diverse than before. There is more than one solution. On the other hand, the loading condition of the containers on deck affects the wind forces during the voyage. The above-mentioned Loading Computer does not consider the wind forces acting on a ship, but from the viewpoint of improving energy efficiency, it is desired to consider the wind forces that change depending on the loading patterns as one parameter. In this paper, the relationship between the loading patterns of containers on deck and wind forces was clarified by means of wind tunnel tests, focusing on the number of gaps between container bays.
{"title":"Changes in Wind Forces of a Container Ship Depending on Loading Conditions on Deck","authors":"K. Kume, T. Hamada","doi":"10.2534/jjasnaoe.33.47","DOIUrl":"https://doi.org/10.2534/jjasnaoe.33.47","url":null,"abstract":"Container ships are becoming larger in order to reduce fuel consumption per unit transportation volume. As the ship size grows, the number of bays in which containers are loaded will increase, and the number of containers per bay will also increase. The loading order of a large number of containers is usually optimized by a computer-aided planning system called a Loading Computer that can comprehensively consider ship stability and cargo handling efficiency. However, due to the increase in the size of ships, the number of ports of call in one voyage and the number of empty containers to be transported also increase, and the container loading patterns are more diverse than before. There is more than one solution. On the other hand, the loading condition of the containers on deck affects the wind forces during the voyage. The above-mentioned Loading Computer does not consider the wind forces acting on a ship, but from the viewpoint of improving energy efficiency, it is desired to consider the wind forces that change depending on the loading patterns as one parameter. In this paper, the relationship between the loading patterns of containers on deck and wind forces was clarified by means of wind tunnel tests, focusing on the number of gaps between container bays.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"21 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":"121646167","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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