著者
正木 宣恒
出版者
公益社団法人日本船舶海洋工学会
雑誌
造船協會會報 (ISSN:05148499)
巻号頁・発行日
no.42, pp.129-162, 1928-03-15

呉海軍工廠造船部に於ては、可なり古くより請負工事を實施し居り、請負基準につきては、長年月の經驗と統計とによる相當確實なる工數表、單價表を制定せられあり、然るに尚此の基準決定を確立する為めに、更に作業の時間研究によりて、工事の基準決定用諸元の研究調査を行ひ、請負基準を科學的に處理決定せんとせり。而して各種方面に亘る造船作業に適應せしむる爲めに、時間研究法を短時間、長時間、既定的、未定的の4に分類し、根本的研究として先づ未定的及長時間研究をなし、一日中の許容時間及添加時間等の割合を定め、工場設備、管理法、作業方法等の適否を見出し、採集したる記録を充分比較吟味して、第2段の既定的及短時間研究に進み基準時間の決定に到達するを最良法と認めたり。實行の結果豫期以上の成績を得、二十幾年來制定せられたる工數表、單價表を確實化し得るに至れり。〓鋲時間研究の一例に見るも、短時間研究と長時間研究とによる標準時間の差約1割に達せる如きは、見逃す能はざる事實なりと認む。
著者
淺羽 隆太郎
出版者
公益社団法人日本船舶海洋工学会
雑誌
造船協會會報 (ISSN:05148499)
巻号頁・発行日
no.42, pp.203-224, 1928-03-15

The auther investigated theoretically the relation between the size of the stabilizer and the amplitude of rolling in several cases ; 1. When the ship is forced to roll by the stabilizer, [numerical formula] denoting the couple produced by the stabilizer by W_m⨂ and the maximum attainable amplitude is given by [numerical formula] 2. When the rolling is quenched by the stabilizer in the still water, [numerical formula] 3. Rolling amongst regular waves. In the case of synchronism, the maximum amplitude is reduced by the stabilizer to θ given by the equation [numerical formula] provided ⨂≦φπ/4. If the size of the stabilizer is so chosen as ⨂=φπ/4,the maximum amplitude is only φπ/4. The larger the size, the less the amplitude, but a vibratory rolling occurs in some cases owing to the too large power of the stabilizer. The theory is compared with the model experiment made by Dr. Motora, showing a fair coincidence.
著者
元良 信太郎
出版者
公益社団法人日本船舶海洋工学会
雑誌
造船協會會報 (ISSN:05148499)
巻号頁・発行日
no.32, pp.75-84, 1924-09-18
被引用文献数
1
著者
山内 俊平 中井 恒男 国広 敏之
出版者
公益社団法人日本船舶海洋工学会
雑誌
関西造船協会誌 (ISSN:03899101)
巻号頁・発行日
no.83, 1956-09

Two liberty ships, the "EVILIZ" and the "EVICYNTHIA", were elongated and reconstructed at the Innoshima Shipyard of Hitachi Shipbuilding and Engineering Co. Ltd.. Seizing this opportunity the authors measured the distribution of the locked-in-stresses along the cutted cross section of the vessels. This paper contains the results of measurement and brief consideration on them.
著者
稗方 和夫 大和 裕幸 リー チー 井上 守正 田中 和哉 小葉竹 泰則
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 (ISSN:18803717)
巻号頁・発行日
no.7, pp.97-106, 2008-06
被引用文献数
1

A methodology to identify crucial tasks of ship design process is proposed in the first report. Crucial tasks of ship design process are identified in the standardized manner to support design knowledge transfer. In this paper, the proposed methodology is implemented as a web based questionnaire system to conduct a large questionnaire-based survey in design department of a shipyard. Unstructured interview after a questionnaire-based survey exhibited the essential characteristics of crucial tasks identified by the methodology. The characteristics in this paper are following three items: Trade-off such as amount of steel product and man hour, capability to extract 3D model and communication skills with outside of his/her team. The survey also pointed out some part of crucial tasks are outsourcing in Japanese shipyards. The proposed methodology is verified in this large empirical study.
著者
稗方 和夫 内藤 紀彦 大和 裕幸 安藤 英幸 中澤 崇
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 (ISSN:18803717)
巻号頁・発行日
no.2, pp.131-137, 2005-12
被引用文献数
5

It's getting more important to transfer knowledge from elder experts to young engineers especially in shipbuilding industry in Japan. We developed knowledge transfer system based on UT-ESS (University of Tokyo Educational Software for Shipbuilding) and proposed a method to acquire knowledge of elder experts using the developed system. The system describes design process as workflows and design documents are associated with tasks in workflows. The association between design process and design documents is described by metadata based on semantic web technology. The proposed method is evaluated through a case study of knowledge acquisition in basic design department in four shipbuilding companies.
著者
尾崎 雅彦 南浦 純一 北島 良則 溝上 宗二 竹内 和久 畠中 勝則
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.187, pp.185-192, 2000-06
被引用文献数
3

Ocean sequestration of the captured CO_2 from fossil fuel burning is a possible option to mitigate the increase of CO_2 concentration in the atmosphere. It can isolate huge amount of CO_2 from the atmosphere for long time in relatively low cost, if it is acceptable from the viewpoint of the oceanic environmental impact. The dissolution type treated in this paper is based on the idea that CO_2 dissolved and sufficiently diluted in seawater does no more harms than slightly increasing the concentration of CO_2 already contained in the seawater. The concept of CO_2 dispersion in the ocean depths by ship is a promising implementation for the efficient dilution. That is, liquefied CO_2 is delivered by ship to the site and injected into ocean depths of 1,000 to 2,500m with a suspended and towed pipe by a slowly moving ship. The constant movement of releasing point of CO_2 causes no stagnation and accumulation of CO_2 in seawater. The released CO_2 will form plenty of droplets, and then they rise gently due to the buoyancy, while reducing in the size to disappear by dissolution in the ambient seawater. Since the turbulent diffusion in the intermediate ocean is dominant horizontally, use of the vertical journey of CO_2 droplets will be very effective for the initial dilution. Thus, authors have good prospects for the dilution ratio of one to a hundred thousands in a couple of hours after injection on an engineering realistic scale, by means that the initial size of droplets is controlled. Drop formations from a fixed nozzle are investigated referring the common knowledge on textbooks. And the possibility of generating relatively large size of droplets from a moving nozzle is experimentally studied. As a result, it is found that the horizontal nozzle towed by the slowly moving ship is promising for the control of the drop formations in a realistic scale .