16. On the Character of a Container Ship
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概要
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This paper describes the summary of a study on the character of a container ship from the viewpoint of economy and structural strength based on the actual data of container ships that were taken through the course of the progress of ships. (These data were mainly produced by the Kobe Shipyard of Mitsubishi Heavy Industries, Ltd. in which the author was employed till recently.) The development of container ships can be observed on two causes "External factor" and "internal factor". "High speed" and "Large size". These can be regarded as the natural characteristics of a container ship, which a conventional cargo liner could not satisfy. Such demand of economics should be called "External factor of development". Another cause called "Internal factor" means "Loading containers on deck" and "Wide and long hatchways". These were attained by container ships. It was verified that expected effects on carrying capacity were proven by these characteristics, by application of various engineering parameters and calculation of economy of ships operation. Existence of this character was also proven by principal component analysis. Furthermore, container ships have the character on structural design that their principal dimensions are determined in accordance with number of containers stowed in holds. The way to future progress of container ships should be considered to utilize further their character. And, the development of total hull girder stress analyzing system in the field of structural design and so called flexible bossings for better performance in the field of resistance should be expected. For guidance the word "container ships" which appears in this paper is understood to be "lift on lift off type".
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