マリンエンジニアリング
Online ISSN : 1884-3778
Print ISSN : 1346-1427
ISSN-L : 1346-1427
49 巻 , 5 号
選択された号の論文の24件中1~24を表示しています
特集 舶用機器の将来像 次世代へ向けた舶用機器メーカーの取り組み
随想
解説
製品紹介
解説
技術資料
解説
特集 船舶の運航支援・監視の現状と将来
随想
解説
技術資料
解説
技術資料
  • 加納 敏幸
    2014 年 49 巻 5 号 p. 654-659
    発行日: 2014/09/01
    公開日: 2015/12/03
    ジャーナル フリー
      The author has promoted and implemented the research and development of the eco-friendly electric propulsion ship “Super Eco-Ship”, weather routing for domestic vessels “Navigation Support System”, and ship allocation problem “Ship scheduling support system” from the viewpoint of operational support of domestic shipping. In other words, the following steps were taken to improve vessel operation efficiency. First, build a highly efficient vessel by adopting the latest technology and having it operated by a great master. Then, optimally allocate vessels to meet the shipper’s requests and perform effective fleet management to achieve environmental and economic benefits. Although there are other tasks such posting crew assignments or vessel maintenance, NMRI takes the viewpoint of operational support technology.
      This paper introduces the history on Research & Development of operational support technology for fleet-management including the evaluation methodology of transportation fleets. These technologies are expected to find application not only in coastal shipping but also in ocean going shipping.
解説
論文
  • 西尾 澄人, 柳 東勲, 岸 武行, 福田 哲吾, 徐 芝徳
    2014 年 49 巻 5 号 p. 666-673
    発行日: 2014/09/01
    公開日: 2015/12/03
    ジャーナル フリー
    At low load operation using heavy fuel oil (HFO) and at engine start-up in a 4-stroke cycle marine diesel engine, a significant amount of smoke is generated. This paper presents results of improvement of combustion in a 4-stroke cycle medium speed marine diesel engine using marine diesel oil (MDO) and heavy fuel oil (HFO). The authors investigated the effect of fuel injection control using a novel fuel injection system (HIS: Hybrid Injection System) composed of a common rail system and a cam drive pump. The findings are the following: (1) At engine start-up using MDO, it is possible to reduce smoke by using low pressure pre-injection of a small amount of fuel. (2) In low engine load conditions using HFO, it is possible to reduce CO and smoke by low pressure pre-injection of a small amount of fuel and after-injection of large amount of fuel. (3) By using HFO as main fuel and MDO as sub fuel, it is possible to reduce CO and smoke significantly by low pressure pre-injection of a small amount of fuel and after-injection of large amount of fuel.
  • 村田 裕幸, 岡 秀行, 春海 一佳
    2014 年 49 巻 5 号 p. 674-681
    発行日: 2014/09/01
    公開日: 2015/12/03
    ジャーナル フリー
      In order to investigate heat transfer distributions on riser walls of a circulating fluidized bed (CFB) under rolling motion, a series of visualization experiments which utilized thermo-chromic liquid crystal was performed. Superficial velocity and rolling period were varied in the experiments, while amplitude of the rolling motion was fixed at 15deg. One-dimensional unsteady thermal conduction analysis was also carried out to evaluate followability of liquid crystal coloration to changes in riser wall temperature. The following results were obtained: (1) Thermal conduction analysis shows that the response delay time of liquid crystal coloration to the wall temperature stays within several seconds under the present experimental conditions. (2) In bubbling and turbulent fluidization regimes at the upright attitude, a remarkable change in liquid crystal coloration due to the steep gradient of voidage was observed at the bottom of the riser wall. On the other hand, uniform coloration was observed over the entire area at the middle of the riser wall. Time-averaged heat transfer rate of the present experiment agrees well with previous results. (3) When the CFB undergoes rolling motion, liquid crystal coloration changes periodically at the middle part of the riser wall. The change is induced by heat transfer fluctuation due to the periodic change of the downflow.
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