著者
市川 慎平 竹花 范平 植松 義量 小林 捷雄
出版者
独立行政法人 海上技術安全研究所
雑誌
船舶技術研究所報告 (ISSN:0495775X)
巻号頁・発行日
vol.1, no.3, pp.207-234, 1964-07-30

It is generally well-known that gas cutting speed can be remarkably increased dy using a divergent-type gas cuttig nozzle instead of a normal straight-type one. In order to the peculiar curvature of its inner shape, however, it is considered to be very difficult to produce a divergent nozzle by simple machining. Therefore, the authors have newly developed two kinds of methods to produce a divergent gas cutting nozzle; one is an electrolytic-forming and another is a swaging. In this paper, the detail of the methods and the processes related to the massproduction and the results of many investigations carried on the cutting performance of the divergent nozzles made by these two methods are described. The following conclusions are summarized. A divergent nozzle made by the electrolytic-forming method shows many advantages; such as a better accuracy, higher cutting capabilities and a lower production-loss, while by the swaging somewhat inferior only in an accuracy compared to the former. However, it is confirmed that the both methods have an extremely higher economies and an easier production, and that, moreover, the gas cutting performance of the divergent nozzles made by these methods is increased 15% in cutting speed and 8% in cutting thickness of plate compared to straight nozzles.
出版者
独立行政法人 海上技術安全研究所
雑誌
船と海のサイエンス : 船と海の総合誌
巻号頁・発行日
vol.1, no.2002, pp.60-63, 2002-08-20

世はあげてスピード時代、船舶の世界でも「より早く、より強く、より安全」な船造りが要請されている。創業以来、これをモットーに掲げて成長を遂げてきたのが、今回ご紹介する墨田川造船株式会社である。高速船艇の建造にかけては、わが国屈指の永い伝統と技術を誇る同造船所に石渡博社長を訪ね、高度な建造技術の実績を支えてきた努力や信念、また新たな時代への展望と抱負を語っていただいた。
著者
森 信篤 森 政彦
出版者
独立行政法人 海上技術安全研究所
雑誌
船舶技術研究所報告 (ISSN:0495775X)
巻号頁・発行日
vol.16, no.2, pp.p63-74, 1979-03

In order to investigate the effect of approach speed upon the manoeuvrability, the manoeuvring test was carried out using a model of container ship with quadruple propellers. From the results, it was made clear that the effect of approach speed upon the manoeuvrability was considerably large, even if the approach speed was less than 0.35 in Froude's Number, and it was caused mainly by the heel of the model in turning. In addition, the effect of initial heel and the number of rudders upon the manoeuvrability and differences of the manoeuvrability between the above-mentioned container ship with quadruple propellers and that of container ships with single, twin and triple propellers, which were previously tested and reported by one of the authors were discussed in this report.