日本舶用機関学会誌
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
25 巻, 11 号
選択された号の論文の5件中1~5を表示しています
  • 大山 正俊
    1990 年 25 巻 11 号 p. 707-711
    発行日: 1990/11/01
    公開日: 2010/05/31
    ジャーナル フリー
  • 木村 隆一, 水谷 博
    1990 年 25 巻 11 号 p. 712-721
    発行日: 1990/11/01
    公開日: 2010/05/31
    ジャーナル フリー
    The sounds generated from an engine contain the information of its operation condition. We decide to make overall evaluation of the information contained in each frequency through the specturum analysis of the sounds. Detection of abnormal sound is performed using statistical analysys. The basic sound pattern of normal operation in the engine is f romed. Sample sound is compared this basic sound pattern, and judged whether abnormal sound exists in the its radiation sound. 400 basic patterns are coverd for one cycle of engine.
    The diesel engine, whose rated power 1500ps, is uesd in this experimental study. The experiments are carried on a voyage. During the engine operate, abnormal sound which artificially is created by hitting is radiated. And the detection of the abnormal sound is tried for sample sound, and its results are successfully obtained.
  • 緒方 一彦, 橋本 正孝, 茶本 哲男
    1990 年 25 巻 11 号 p. 722-736
    発行日: 1990/11/01
    公開日: 2010/05/31
    ジャーナル フリー
    This paper reviews about turbulence charactericities of the squish flow in engines. Since turbulence has a major effect on the combustion process and on the heat transfer near top dead center of the power stroke, it is important to achieve a better understanding of turbulence generation during the intake process.
    Former study, we showed the squish flow by the smoke wire method for flow visualization. Photographs of flow field were analyzed by computer. But results were obtained qualitative. And in this work we investigated several turbulence charactericities by using of hot wire anemometry.
  • 貝瀬 徹, 堀籠 教夫
    1990 年 25 巻 11 号 p. 737-745
    発行日: 1990/11/01
    公開日: 2010/05/31
    ジャーナル フリー
    This paper mainly deals with the field data gathering and their analysis by using a personal computer (PC) equipped in merchant ships. In general, the field data have been collected by the crew, and then they have been investigated by some section of data analysis on shore. In such techniques, there have been often happened the following accidents: missing or loss of data, loss of information due to data analysis, misunderstandings between on board and on shore. Moreover, it has been observed that the results obtained by analysing the data gathered from many merchant ships often do not present the characteristics of reliability and maintainability of each ship well and have not always been useful or available for each ship. This fact suggests that the data analysis should be performed on board, and then the results or the inf ormations obtained should be used immediately. First in order to gather the field data, the outline of a new software based on the text“Application of Failures and Alarms on Equipment for MO ships”edited by Ministry of Transport and Nippon Kaiji Kyokai is presented, and next the data analysis methods based on the Weibull probability paper and the Weibull type of the cumulative hazard paper are proposed newly. These methods are performed by utilizing the PC. Finally, the methods presented in this paper are shown to be very useful by illustrating the case studies.
  • 日本舶用機関学会軸系研究委員会
    1990 年 25 巻 11 号 p. 746-755
    発行日: 1990/11/01
    公開日: 2010/05/31
    ジャーナル フリー
    Although a temperature sensor for stern tube bearing is one of the most important items in the propulsion shafting system in the sense of knowing the operating condition of stern tube bearing, the relations among positioning and structuring for installation of the temperature sensor and sensing effectiveness is not fully understood and method of sensor installation is different among the respective companies.
    Under the circumstances, simulation about sensing effectiveness is carried out in the use of model testing devices, and information about installation of temperature sensor and measured value of temperature is gathered from actual ships.
    As a result of them, essential points on installing the temperature sensor and monitoring temperature are rounded up in order.
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