Journal of the Japan Society of Naval Architects and Ocean Engineers最新文献_第4页

CTV から浮体式変電所への作業員移乗時に関する一考察关于从CTV到浮式变电所的工作人员转移时的考察

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.37.81

Kentaro Takagi, Hiroyuki Nakagawa

引用次数: 0

Cellular Automaton Analysis Considering Spatial Covariance Structure on Under-film Corrosion 考虑空间协方差结构的膜下腐蚀元胞自动机分析

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.31.135

K. Shiotani, N. Osawa

引用次数: 0

Wind Velocity Profile and Representative Wind Velocity for Wind Resistance Measurement of Ship Models 船舶模型风阻测量的风速廓线和代表风速

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.1

K. Kume, Hiroki Ohba, H. Orihara, S. Mizokami

{"title":"Wind Velocity Profile and Representative Wind Velocity for Wind Resistance Measurement of Ship Models","authors":"K. Kume, Hiroki Ohba, H. Orihara, S. Mizokami","doi":"10.2534/jjasnaoe.30.1","DOIUrl":"https://doi.org/10.2534/jjasnaoe.30.1","url":null,"abstract":"Wind resistances and moment acting on a ship model measured in a wind tunnel are non-dimensionalized using the air density, the projected area of the model and the representative wind velocity. However, there is no common definition of the representative wind velocity in wind tunnel tests for ships, thus wind velocities which are obtained by an anemometer fixed in a certain place in a wind tunnel or measured at a height equivalent to 10 m from the sea surface are often used. In principle, there is no problem as long as the wind velocity profile under the same condition is assumed and the wind velocity at the same position is employed when the wind resistance coefficients are converted into forces of different scales. Nevertheless, if the wind velocity distributions between in the wind tunnel test and the assumed distribution by the user are different, the wind resistance coefficients cannot be used in the first place. And the existence of various definitions of non-dimensionalization makes it difficult to simply compare wind resistance coefficients themselves. Since it is meaningful to clarify the definition of the representative wind velocity which can provide wind resistances in a realistic and reasonable manner using the wind resistance coefficients without being influenced by the assumed wind velocity distribution, it was derived from the results of wind tunnel tests under the conditions of various wind velocity profiles and using various types of ship models. Furthermore, the influence of the wind velocity profile on the wind resistance measurement was evaluated with the results of the wind resistance measurement in different wind velocity profiles. Several findings on the wind velocity profile required for wind resistance measurements are reported in this paper.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"19 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120845152","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: 4

A Study on Analysis Method of Resistance Test by using Circulating Water Channel 利用循环水通道进行阻力试验分析方法研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.27

H. Nishimoto, T. Kawashima, Y. Doi

引用次数: 2

Strength of GFRP Sandwich Plates for Small Ships 小型船舶用玻璃钢夹芯板强度研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.107

Yoshiteru Tanaka, Yusuke Komoriyama, Yutaka Hashizume, A. Sakurai

引用次数: 0

Development and Demonstration of a Low-Cost Coastal Wind Observation System 低成本海岸风观测系统的研制与示范

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.29.163

T. Kodaira, R. Wada, D. Wada, Shogo Watanabe, Y. Kita, T. Waseda

引用次数: 0

Effectiveness of Bulbous rudder with Horizontal Fins on the Propulsion Performance of Ship in Waves 水平翅片球茎舵对波浪中船舶推进性能的影响

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.34.29

W. Htay, Benson O. Mwangi, H. Matsuura, Y. Toda

引用次数: 0

Effect of Pitch Moment of Inertia on Added Resistance of Container Ship in Waves 纵摇惯量对集装箱船波浪附加阻力的影响

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.33.81

H. Yasukawa, Kenji Enui

引用次数: 0

Characteristics of Roll Damping of Pure Car Carrier and Liquefied Natural Gas Carrier and applicability of Ikeda’s Method 纯汽车运输船和液化天然气运输船的减摇特性及池田方法的适用性

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.31.83

T. Katayama, Y. Takasaki, Toshiya Adachi, Mai Kankaku, Kei Sugimoto, Yusuke Fukumoto

{"title":"Characteristics of Roll Damping of Pure Car Carrier and Liquefied Natural Gas Carrier and applicability of Ikeda’s Method","authors":"T. Katayama, Y. Takasaki, Toshiya Adachi, Mai Kankaku, Kei Sugimoto, Yusuke Fukumoto","doi":"10.2534/jjasnaoe.31.83","DOIUrl":"https://doi.org/10.2534/jjasnaoe.31.83","url":null,"abstract":"It is important for the safety of ship in waves to understand its roll characteristics at the design stage. However, it is not easy to estimate roll accurately, because the viscous effects on roll damping affect significantly roll near its resonance frequency. For that purpose, it is significant to estimate roll damping accurately. As one of prediction methods of the viscous effects, Ikeda’s method is well-known. However, it is pointed out by Tanaka et al. (1981) that the method overestimates the roll damping when the method is applied to a ship with shallow draught. On the other hand, with the recent enlargement and specialization of merchant ship, its breadth has increased compared to the hull form at the time when Ikeda's method was developed, and its height of the center of gravity has increased relative to draft. Therefore, when Ikeda's method is applied to such hull form, there is a concern that the estimation accuracy will deteriorate. In this study, the characteristics of roll damping for two hull types (PCC: Pure Car Carrier and LNGC: Liquefied Natural Gas Carrier) with shallower draft and higher center of gravity compared to the ships which existed when Ikeda's method was developed, are investigated experimentally. The measured results are compared with the results of Ikeda’s method to confirm the estimation accuracy and its characteristics, and the results of investigating the difference of them are reported.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"16 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":"114323816","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

Hull form optimization of an icebreaker ship considering the performance in ice and open water conditions 考虑冰面和开阔水域性能的破冰船船体形状优化

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.35.1

Keisuke Anzai, T. Hino, Y. Yamauchi, S. Mizuno

引用次数: 0