1 0 0 0 OA 文化の日

出版者
公益社団法人日本船舶海洋工学会
雑誌
らん : 纜 (ISSN:09160981)
巻号頁・発行日
no.42, 1998-12-30
著者
矢崎 敦生
出版者
公益社団法人日本船舶海洋工学会
雑誌
日本造船学会誌 (ISSN:03861597)
巻号頁・発行日
no.724, pp.692-694, 1989-10-25
出版者
公益社団法人日本船舶海洋工学会
雑誌
造船協会誌 (ISSN:03861597)
巻号頁・発行日
no.429, pp.155-160, 1965-04-25

60mまでの小型沿岸船の復原能力はある種の荷重状態のもとで, あるいはまた甲板上に氷結を起こしたとき, 不十分なものとなる。多くの小型船が未知の条件のもとで遭難を起こしたため, この問題について1950年から60年にかけて多くの理論的, 実験的な研究が行なわれて来ている。Manleyの指摘するところによると, 60mまでの小型船は復原能力の立場から見ると大型船よりも危険状態にある。さらに船舶の全遭難数のうち, これら小型船の遭難が占める割合は増加の傾向を示し, 1899年から1913年の間の36%が第2次大戦後は66%に達している。一方全船舶数に対して小型の占める割合は20%から30%を保っている。また小型船の遭難の70%は冬期に起こり特に乾玄の低いこと, 甲板上に貨物を搭載していたことが共通している。これらの小型船の遭難を防止するためには, 遭難機構を解明し, 現実的な規則をもうけて復原能力の欠陥を改善しなければならず, また国際安全規則に対するトン数制限を500登録トン以下に引き下げることが望ましいものと思われる。
著者
黒田 七郎 田中 拓 上田 隆康 隆杉 憲行
出版者
公益社団法人日本船舶海洋工学会
雑誌
造船協會論文集
巻号頁・発行日
no.117, pp.292-309, 1965-06

It is well known that a submarine has the excellent propulsive performance in high speed navigation in deeply submerged condition, but few papers have sufficiently shown economical feasibility of submarines for commerical use.The authors have studied about the feasibility of submarine tankers with a view to develop technical problems of commercial submarines. At first, the experiments on five submarine tanker models with the circular and rectangular hull sections were performed by method of three-component measurements at Mejiro No. 2 Tank.Examining the resistance, stability, floating draft and general arrangement of the submarine tankers, the authors chose the ST-2 type rectangular hull form as best for the submrine tanker. The lines of the ST-2 type hull form was shown in Fig. 3 The ST-2 type submarine tankers with various dead weights and shaft horse powers were designed and their investment, operation cost, annual profit, freight rate per dead weight and cpital recovery factor were calculated. The results of this study were summarized in Fig. 19 to 23. The best submarine tanker in the point of view of commercial feasibility was 40,000 tons in dead weight and 20,000 horse powers in shaft horse power under restrained condition within 14 meters in maximum floating draft. On the contrary to the previous opinions, was shown she fact that the submarine tankers would not be very fast than present conventional tankers. As shown in Fig. 23,the submarine tanker would not have commercial feasibility without drastically decreased cost of nuclear power plants.
著者
安藤 英幸 大和 裕幸 堀 晃 増田 宏 白山 晋
出版者
公益社団法人日本船舶海洋工学会
雑誌
日本造船学会論文集 (ISSN:05148499)
巻号頁・発行日
no.192, pp.475-483, 2002-12
被引用文献数
1

Machinery maintenance activities should be based on statistics and knowledge of past machinery failures, but it is often difficult to keep gathering those data in engineers' daily works. This paper describes an approach to acquire those data and knowledge from machinery failure reports, which are written as free texts, by applying text mining techniques. The method consists of three stages. The first state is event extraction. The term event represents a status of an object ; "damage of a piston ring" is an example of it. Each machinery failure reports is converted into a set of events in this stage. The second stage is to find relations between the events. To find taxonomic relations, we defined a lexical distance and direction measure to evaluate similarities among events. To find non-taxonomical relations, an association rule mining method is used. The third stage is evaluating extracted relations. Authors tested the proposing knowledge acquisition process with 136 machinery failure reports and expert engineers validated more than 80% relations are correct knowledge.
著者
市来崎 哲雄 山本 郁夫
出版者
公益社団法人日本船舶海洋工学会
雑誌
日本船舶海洋工学会論文集 = Journal of the Japan Society of Naval Architects and Ocean Engineers (ISSN:18803717)
巻号頁・発行日
no.5, pp.9-13, 2007-06-01
被引用文献数
1

The authors developed a robotic fish that swim with fins that apply flexible oscillating fin technology. The Carp Robot, whose artificial appearance was created through three-dimensional CAD processing of numerical data for the outer shape of living carp sampled through three-dimensional laser digitizing. Although this robotic fish was developed for the amusement field, it is thought to contain key technologies for the development of work robots in the future. For example, "mechatronics" technology involving center-of-gravity shifts, FM radio wave technology for navigation, CCD image data transfer technology for observation, and other technologies were applied to the robotic fish. In this report this robotic fish will be used as examples to explain these development achievements.