Journal of the Japan Society of Naval Architects and Ocean Engineers最新文献_第3页

Study of the practical application of production planning method using shipbuilding process simulation 船舶生产过程仿真生产计划方法的实际应用研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.37.115

Yui Okubo, T. Mitsuyuki

引用次数: 0

Stability Index for Rectangular-Hulled Floating Bodies 矩形船体浮体的稳定性指标

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.63

Yuji Doya, T. Sawada

引用次数: 0

Ultimate Longitudinal Strength of Ships' Hull Girder under Combined Loading — 3rd Report: Introduction of the effect of bulkheads and side structures to torsional analysis with using 1 dimensional finite element method — 组合荷载作用下船体梁的极限纵向强度-第三次报告:用一维有限元法介绍舱壁和舷侧结构对扭转分析的影响-

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/JJASNAOE.16.121

Yoshiteru Tanaka, T. Ando, Yosuke Anai, K. Iijima, M. Fujikubo, T. Yao

{"title":"Ultimate Longitudinal Strength of Ships' Hull Girder under Combined Loading — 3rd Report: Introduction of the effect of bulkheads and side structures to torsional analysis with using 1 dimensional finite element method —","authors":"Yoshiteru Tanaka, T. Ando, Yosuke Anai, K. Iijima, M. Fujikubo, T. Yao","doi":"10.2534/JJASNAOE.16.121","DOIUrl":"https://doi.org/10.2534/JJASNAOE.16.121","url":null,"abstract":"It is necessary to make clear the effect of torsional moment on the ultimate strength of the ships' hull girder for the accurate assessment of that of ultra large container ships with large deck openings. In the present study, the extension of the simplified method of progressive collapse analysis based on Smith's method is attempted to the case of combined loading condition. Firstly, progressive collapse tests are carried out on 1/13-scale three-hold hull girder models referring to a Post-Panamax container ship. The models are fixed to the rigid wall at the aft end and a couple of forces are applied to the fore end so as to generate torsional and vertical bending moment simultaneously. The progressive collapse tests are conducted for the case of the various combinations of torsional and bending moment. The nonlinear finite element analyses by LS-DYNA are executed in accordance with the test conditions. From the test and calculation results, the progressive collapse behavior and the ultimate strength of hull girder models under combined loading are examined. The results will be a basis for the verification of a new simplified analysis method which will be presented in the forthcoming reports.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"45 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":"127011792","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

Development of the Autonomous Control System for Autonomous Underwater Glider with Independently Controllable Main Wings 自主水下滑翔机主翼自主控制系统的研制

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.191

Kanako Kobatake, M. Arima

{"title":"Development of the Autonomous Control System for Autonomous Underwater Glider with Independently Controllable Main Wings","authors":"Kanako Kobatake, M. Arima","doi":"10.2534/jjasnaoe.33.191","DOIUrl":"https://doi.org/10.2534/jjasnaoe.33.191","url":null,"abstract":"In recent years, global warming has become more and more serious, and the practical application of renewable energy that does not rely on fossil fuels has become an urgent issue. The 17 Sustainable Development Goals (SDGs) adopted by the United Nations as goals to be achieved by 2030 include \"take urgent action to combat climate change and its impacts\" and \"conserve and sustainably use the oceans, seas and marine resources for sustainable development\", and countries around the world are beginning to work on it. The ocean, which occupies about 70% of the earth's surface, has a great influence on the global climate change, and it is extremely important to understand the ocean environment correctly. Recently, autonomous underwater vehicles (AUVs) are playing an active role in oceanographic surveys and seafloor exploration. Especially, autonomous underwater gliders that can be operated for a long period of time are attracting attention for global marine environment surveys. The underwater glider with independently controllable main wings developed at Osaka Prefecture University realises high kinetic performance by controlling the left and right main wings independently. In this research, the authors attempted to develop an autonomous control system and verify it by automatic navigation simulation aiming at the establishment of a control system to be implemented on a testbed vehicle of the underwater glider with independently controllable main wings, \"SOARER\".","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"138 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":"121790627","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

Investigation of Crack Propagation Behaviors in a Fillet Welded Joint Employing X-FEM 角焊缝裂纹扩展行为的X-FEM研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.137

Kengo Maeda, Satoyuki Tanaka, Hiroki Takahashi, Koki Tazoe

引用次数: 4

Deep Reinforcement Learning Control to Maximize Output Energy for a Wave Energy Converter 波能转换器输出能量最大化的深度强化学习控制

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.31.229

Jun Umeda, T. Fujiwara

引用次数: 2

A Study on Bayesian Updating of Time History Sea State Estimation Based on Measured Hull Stresses 基于实测船体应力的时程海况估计贝叶斯更新研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.34.73

H. Kubo, T. Okada, Xi Chen, Y. Kawamura, T. Mitsuyuki

引用次数: 1

A Study on Preventive Measures for Fatigue Cracking at Welded Joints in Cargo Tank Structure of Chemical Tanker 化工船货油舱结构焊接接头疲劳开裂预防措施研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.149

K. Okada, S. Kimura, Yuichi Yamamoto, H. Ogata, Masayuki Kaneko, Hiromi Ando, Ryotaro Muta, T. Tanino, H. Yajima

引用次数: 0

Numerical Estimation of Position and Flux of Naturally Seeping CO2 in Kagoshima Bay Using AUV Observation Data 利用水下航行器观测资料对鹿儿岛湾自然渗透CO2位置和通量的数值估算

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.143

Yuuki Takeoka, Shunsuke Kanao, Satoshi Tahara, Toru Sato, K. Shitashima, Y. Maeda

{"title":"Numerical Estimation of Position and Flux of Naturally Seeping CO2 in Kagoshima Bay Using AUV Observation Data","authors":"Yuuki Takeoka, Shunsuke Kanao, Satoshi Tahara, Toru Sato, K. Shitashima, Y. Maeda","doi":"10.2534/jjasnaoe.30.143","DOIUrl":"https://doi.org/10.2534/jjasnaoe.30.143","url":null,"abstract":"To mitigate global warming, the large volume of CO2 released into the atmosphere must be reduced. CO2 capture and storage (CCS) is one of the promising means for this purpose. In Japan, CCS operators who inject and store CO2 into sub-seabed geological formations are legally required to monitor CO2 leakage in seawater, even though such probability is extremely low; if unusually high CO2 concentration is detected, specifying the position and flux of the associated CO2 seepage is necessary for social responsibility. In this study, we adopted the adjoint marginal sensitivity method to estimate the position and flux of the CO2 naturally seeping on the hillside of a sea knoll on the east of Wakamiko Caldera in Kagoshima Bay, using the pH data observed by an AUV. The tidal currents were time-forwardly simulated and stored to use negatively in the time-backward calculation of the adjoint marginal sensitivity. The result indicated a seepage position on the east hillside of the knoll and a plausible seepage flux. Another observation of the vertical pH distribution implied that there could be two seepage positions at short distances on the same hillside, and the estimated one was in the middle of them. It is then inferred that this method can be applied for the source detection of various marine pollutants and resources.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"5 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":"123685507","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

Consideration on how to decide the optimal control force of a PA-WEC for maximizing its electric power generation in irregular waves 如何确定PA-WEC的最优控制力，使其在不规则波浪中发电量最大化

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.31.73

M. Murai, H. Iikura

{"title":"Consideration on how to decide the optimal control force of a PA-WEC for maximizing its electric power generation in irregular waves","authors":"M. Murai, H. Iikura","doi":"10.2534/jjasnaoe.31.73","DOIUrl":"https://doi.org/10.2534/jjasnaoe.31.73","url":null,"abstract":"This paper describes an analytical solution on the optimal control force for maximizing power generation of Point Absorber Wave Energy Converter (PA-WEC) in irregular waves. The response and optimum control force on a PA-WEC in regular waves achiving a maximum electric power generation has been already developed taking into account the energy loss in the electric circuit in frequency domain and in regular waves. On the other hand, in irregular waves, to obtain the best control force in timely has been difficult, because the control force act on the instantaneous power generation rate and the whole later heaving response of the PA-WEC. This means that whether the decided control force is the best or not is difficult to judge. Actually, in the previous researches, the researchers applied a lot of way to decide the control force. But the generated electric power in irregular waves ratio to the expected generated power obtained from the wave spectrum is up to almost from 0.3 to 0.7. This paper presents an analytical solution of the control force parameter for maximizing the generated electric power in irregular waves on a PA-WEC in time domain. Then, numerical studies are carried based on the proposed method. From these results, it is shown that the proposed method achieves the generated electric power to the expected generated power obtained from the wave spectrum","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"8 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":"121562962","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