マリンエンジニアリング
Online ISSN : 1884-3778
Print ISSN : 1346-1427
ISSN-L : 1346-1427
38 巻 , 8 号
選択された号の論文の5件中1~5を表示しています
  • 橋本 武
    2003 年 38 巻 8 号 p. 488-494
    発行日: 2003/08/01
    公開日: 2010/05/31
    ジャーナル フリー
  • 中井 昇
    2003 年 38 巻 8 号 p. 495-500
    発行日: 2003/08/01
    公開日: 2010/05/31
    ジャーナル フリー
    Two group of rubber have been renewed after the begining of service of the vibration damper on the main engine. The first renewal was after 5 years and 8 months from the installation and the second after 7 and half years from the first. The rubber used now is the third group over 2 years from the second. It was found out that the estimated values of shaft center with calculating the difference of the rubber-shrinkage correspond with the measured ones. So, the detailed investigation could be carried out for the variation of shaft center by the compound deformation due to heat, elasticity and plasticity and the creep of the rubber on each of group for long time. It happened sometimes that the variation of shaft center became about 1.0 mm with the difference of the environmental temperature, e.g. such as that of before starting and just after stopping engine. The value is the limit to the engine. Then the early large creep reduce like gentle slope after 10-12 months from setting new one
  • 木船 弘康, 桑山 信之, 畑中 義博, 中岡 睦雄
    2003 年 38 巻 8 号 p. 501-508
    発行日: 2003/08/01
    公開日: 2010/05/31
    ジャーナル フリー
    This paper describes a novel steam super-heater system which consists of sheath heater and induction heating unit. The structure of hybrid heater system is introduced as compact system for its portable use.The characteristic of electrical equivalent circuit of induction heating load as the temperature of heat exchanger rises is clarified.
    A complex resonant zero current switching (ZCS) high frequency inverter is proposed as the high frequency power supply. The optimum circuit parameters such as inductance ratio and capacitance ratio are investigated in connection with ZCS operation region.
    On the basis of these investigations, the complex resonant ZCS high frequency inverter is designed. The steam super-heater system is successfully examined and superheated steam of 200°C is generated in 30 second from starting condition. The usefulness of the
    high frequency power supply is verified experimentally as high efficiency of 96% on power conversion.
  • 前田 和幸, 高崎 講二, 津田 稔, 阿部 清三
    2003 年 38 巻 8 号 p. 509-513
    発行日: 2003/08/01
    公開日: 2010/05/31
    ジャーナル フリー
    To clarify the proper dilution ratio, new dilution system was designed. The sampling line that was heated by flexible heater was inserted to dilution tunnel horizontally. And the tip of the line was designed as double pipe so that exhaust gas may not be cooled by dilution air. The examinations were carried out to change the dilution ratio was set from 4 to 30 by using old and new dilution systems.
    Results obtained from the examinations are as follows.
    (1) Measured PM decrease when a dilution ratio is enlarged.
    (2) The decrease ratio become about 1/4 by using the new system.
    (3) The most suitable value of the dilution ratio is around 5.
  • ハイ グエン ノック, 西田 修身, 藤田 浩嗣, 原野 亘
    2003 年 38 巻 8 号 p. 514-523
    発行日: 2003/08/01
    公開日: 2010/05/31
    ジャーナル フリー
    ディーゼル機関から排出される粒子状物質 (PM) の大きさ, 数密度および質量濃度を評価するためにRayleigh DebyeによるClusterモデルによる新しい方法を開発した.実際の測定系は散乱法と透過法を併用したものである.この系によって測定される粒子状物質濃度は粒子状物質自身の物性 (光学定数) や使用される光源の波長等が影響因子として考えられる.
    本論文では散乱光強度比より決定づけられる凝集体の等体積球相当径 (Da) を固定し, 数密度を予測するにあたって, 使用光源波長や減衰係数 (Qext) の影響が粒子状物質の数密度値におよぼす影響を検討した.さらにレーザー法とフィルター法の両手法の実験結果を論じた.特に低濃度域でのナノ粒子状物質の大きさおよび質量濃度のリアルタイム計測に大きな役割を果たすことが言えた.
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