著者
武田 幸男 坂本 研也 根岸 道明
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.10, no.2, pp.160-169, 1975-02-01 (Released:2010-05-31)
参考文献数
11

大容量化する船舶電源装置では, 発電機を常時並列運転することが一般化してきた.並列運転時に発生する無効横流を抑制するために横流補償装置が用いられるが, 負荷時には母線電圧を低下するように作動するから, 従来は横流補償率を大きくすることが出来なかった.それゆえ, 低い横流補償率の場合は並列運転系統の安定度が低下し, 負荷の増加によって乱調を発生する場合がある.本文は, 大きな横流補償抵抗と, 差動変流器 (DCT) を組合せた差動横流補償装置 (DCC) を用いて.極めて安定で, かつ, 電圧変動率の小さい電源構成が得られることを示したものである.すなわち, 差動変流器を横流補償回路に導入した場合の動態安定度と定態安定度の解析を行なって.動態安定度は差動変流器の有無に関係しないこと, 及び, 横流補償度 (横流補償率とAVRの制御ゲインの積) の最低制限値が定態安定度から求められることなどを明らかにした.又, その結果に基づいて, 差動横流補償装置の設計方針を示し, 単独・並列運転のいずれにおいても母線の電圧変動率を±1%以内とする安定な電源設計例を示した.本装置はすでに多数の船舶に装備され, その効果は確認されている.
著者
畑中 義博 大西 正幸
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.18, no.4, pp.352-358, 1983-04-01 (Released:2010-05-31)
参考文献数
13
被引用文献数
1

The reduction in fuel consumption and NOxemission have been confirmed with burning of emulsified fuels in diesel and boiler plant so far. Fuel savings from four to seven per cent have been achieved, when burning water-in-heavy oil emulsions in marine diesel engines.In the evaluations of emulsified fuel combustion, the following parameters should have been considered: water content, particle size, distribution, stability, viscosity, specific gravity. These fundamental data with emulsified fuel have been lacked.Thus investigations have been given to these parameters which affect conditions of combustion.
著者
伊藤 聡史 志摩 政幸 菅原 隆志 地引 達弘 秋田 秀樹 雨澤 弘機 大貫 晃
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.45, no.2, pp.269-275, 2010 (Released:2012-12-06)
参考文献数
8
被引用文献数
2 6

A basic study on the development of sliding materials which can be used in seawater is made in this paper. As well known, stainless steel and titanium alloy are both fine anti-corrosive materials in seawater, but these are easily worn as resulting from corrosive type of wear in seawater. In order to overcome the disadvantage silicon (Si) particles were embedded into the surface layers of them, by applying the rubbing treatment process which was developed by the authors. The wear tests were done in artificial seawater by using the reciprocating wear apparatus. The results show that the coefficient of frictions are not so improved, but wear resistant properties are improved, especially for Si treated stainless steel mated by the same substrate material. Based on the results the wear mechanism of the developed materials is discussed.
著者
Lunde Tore
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
Marine engineering : journal of the Japan Institution of Marine Engineering = マリンエンジニアリング : 日本マリンエンジニアリング学会誌 (ISSN:13461427)
巻号頁・発行日
vol.40, no.3, pp.337-340, 2005-05-01

Unlike all cargo ships, liquefied natural gas (LNG) carriers have continued to use steam turbine propulsion plant despite more efficient diesel engine being available. This is because the gas that naturally evaporates from the cargo (called boil-off) is used as fuel for the steam turbines, and until recently there was no other use for it. The ability to reliquefy the gas given off by the cargo now makes it possible to increase the amount of LNG delivered to the discharge port, which is more profitable than using it as ship' s bunker.<BR>Reliquefying LNG and returning it to the cargo tanks means that gas never enter the engine room, adding to the general safety margin. Total separation between cargo and engine room means that the propulsion system and type of fuel used can be chosen freely.
著者
一色 尚次 塚原 茂司 崔 甲錫 桑原 孫四郎 杠 好秋
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.12, no.9, pp.705-714, 1977

Firstly, a theoretical comparison of performance of Stirling engine cycle of various types, the Rombic type, L (or V) type, and Inversed T type (I-T type), is shown in this report.<BR>By the results, the non dimensional power &Delta;<I>pm/pm</I> is highest for the I-T type with adequate value of <I>x</I> (non dimensional volume difference between low temperature cylinder and high temperature cylinder of displacer cylinders) .<BR>Also it is shown that, the weight ratio of gas which pass through regenerator to the total gas is highest at I-T type.<BR>Secondly, an experiment of Stirling engine of L-type by atomospheric air is reported here.<BR>By its results, the power is high when the pressure drop by the regenerator is smaller than 1/10 of mean absolute pressure.<BR>The tendency of performance is known to be proportional with Schmidt theory that uses two region model of constant temperature.<BR>By this study many fundamental knowledge about Stirling Engine is accumulated very much.