マリンエンジニアリング
Online ISSN : 1884-3778
Print ISSN : 1346-1427
ISSN-L : 1346-1427
46 巻 , 2 号
選択された号の論文の28件中1~28を表示しています
特集 IMO 規制対応の現状および将来技術
随想
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特集 張り巡らされるセンサー・計測技術
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技術資料
論文
  • 山梨 晶弘, 辻田 晋, 清水 悦郎, 伊藤 雅則
    2011 年 46 巻 2 号 p. 240-245
    発行日: 2011年
    公開日: 2013/10/23
    ジャーナル フリー
    Now remotely operated underwater vehicle (ROV) becomes main tool to explore or to make work in the sea and high performance is expected as a usual matter. The authors have been studying how to improve the performance of robot arm on the ROV and proposed here a new technology to show the image of the objects more clearly with diminishing interference of robot arm as a 1st result. This technology uses computer graphics and builds 3D vision through the image of robot arm with it. That is as follows; when we get the interfering image of object and robot arm, we replace the image of robot with the graphic model and fill the interfered parts of object with the data without interference. This method proved usefulness with experiments and it is on the improvement for actual use now.
  • 今井 祥子, 宮田 修, 安藤 裕友, 高橋 千織, 仁木 洋一, 小島 隆志, 千田 哲也
    2011 年 46 巻 2 号 p. 246-251
    発行日: 2011年
    公開日: 2013/10/23
    ジャーナル フリー
    Polycyclic Aromatic Hydrocarbons (PAHs) are formed by incomplete combustion of fuels and discharged into the environment. Some compounds have been identified as carcinogenic, mutagenic, and teratogenic. Exhaust gas from a 4 stroke marine diesel engine was trapped in the resin and filters, and PAHs were analyzed by GC/MS. The relationship between PAHs emissions and the engine operating condition was examined. The results show that as the engine load increases, SOF concentration decreases. Low-molecular PAHs in gaseous state were trapped in the resin. On the other hand, high-molecular PAHs bound to particulate matter were trapped in the filter. PAHs emissions were highest when the engine was operated at 25% load using Heavy Fuel Oil (HFO). Highly toxic PAHs were also detected at this operating condition. PAHs from exhaust gas using HFO were more than those of Marine Diesel Oil. It is necessary to monitor and a accumulate data of PAHs emissions in the exhaust gas of marine diesel engines.
  • 徐 芝徳, 西尾 澄人, 井亀 優, 桑原 孫四郎
    2011 年 46 巻 2 号 p. 252-256
    発行日: 2011年
    公開日: 2013/10/23
    ジャーナル フリー
    In this research an assist-injector was newly developed to improve the CO, THC and smoke emissions from a marine diesel engine fueled with vegetable oil. The effect of pre-injection and after-injection on the combustion characteristics and the exhaust emissions were investigated by engine test bench experiments. Results show that the assist-injector is effective for CO, THC and smoke emissions reduction. The reduction efficiency of CO, THC and smoke is about 30% with after-injection, and is over 50% with pre-injection.
  • 木下 英二, 藤本 將仁, 吉本 康文, 田島 博士, 清水 聡
    2011 年 46 巻 2 号 p. 257-262
    発行日: 2011年
    公開日: 2013/10/23
    ジャーナル フリー
     In order to reduce NOx and Smoke emissions from diesel engines with coconut oil methyl ester (CME), emulsified coconut oil methyl ester (ECME) was made using crude glycerol which is a by-product of transesterification, as an emulsifier. The combustion characteristics and exhaust emissions of ECME were investigated using a DI diesel engine. ECME showed better stability than emulsified rapeseed oil methyl ester (ERME). NOx and Smoke emissions of ECME reduced when the water content was increased up to 20 mass%. ECME with a water content of 15 mass% has lower HC, CO, NOx and Smoke emissions compared to ERME with the same water content due to the lower exhaust emissions of the CME base fuel. From the experimental results, it is concluded that the combustion characteristics and exhaust emissions of emulsified biodiesel are affected by the base fuel.
  • 井上 泰宏, 松浦 貴, 千田 二郎
    2011 年 46 巻 2 号 p. 263-268
    発行日: 2011年
    公開日: 2013/10/23
    ジャーナル フリー
    Biodiesel fuel (BDF) is a renewable resource, and is a promising carbon neutral fuel. However, BDF has the properties of high viscosity and poor volatility. Therefore, the atomization of its spray seems to be inhibited, which results in problems such as severe engine deposits and injector coking. In this study, BDF is mixed with a low boiling fuel to improve its fuel properties. Ethanol was chosen as the fuel to be mixed with BDF because of its higher oxygen content, lower ignitability and higher volatility. The ethanol addition would exert a large influence on mixture formation, ignition, combustion, and exhaust emissions. In the experiments, the spray characteristics were measured by shadowgraph photography and Mie-scattered light photography, while the mixture concentration and ignitability were measured by chemiluminescence photography. The experimental results show that the liquid phase penetration decreased with increasing of the mixture ratio of ethanol to BDF, and the ignition timing and ignition position can be controlled by changing the mixture ratio of BDF and ethanol.
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