10. The Statistics of Failure and Evaluation of Reliability on the Marine Diesel Engine

概要

論文の詳細を見る
It is the purpose of this research and investigation to point out the statistics and evaluation of a great number of failure reports on the marine diesel engines of many merchant ships in Japan. Several problems and questions which come up from the recent technical innovation for the above ships are as follows;(1) As the number and variety of parts and elements for marine equipment of propulsive engine plant become rapidly the larger the wider and the more complicated, the relative reliability level of their system, are considered to be the lower. (2) There were not enough useful informations and materials in order to plan and design such a good ship as can endure serious operating conditions. (3) As the container service fleet, MO classed fleet and super-automation fleet need greater amount of investment than the other, they are expected to have much more rationalization, safety, higher efficiency, reliability and better maintainability. (4) A large number of field data and considerable experiences which come from preventive and corrective maintenances submitted by crews at sea cannot be fed back sufiiciently to the ship design, improvement and manufacture at land. From the above points of view, a large number of failure reports from many marine diesel ships were submitted to the marine division of N.Y.K head office in Tokyo Japan. The numbers of failure reports were counted approximately 7500 which were the largest field data for marine propulsive engine, improvement, reliability and maintainability. All of them were handled by engineers on forty six diesel ships during more than one million propelling hours between September 1965 and March 1970, which was the longest period. Researches were limited to the only one operating company but investigated into the four types and ten kinds of main diesel engines. It is concluded from the statistics and evaluation due to researches and investigation described above, the following conclusions might be obtained;(1) The failure reports and their man × hours for repair works on main diesel engine occupied about forty percents of the overall reports and man × hours of total main diesel engine plant. (2) Especially both total hours and occurrences of main engine stoppage occupied more than ninety percents of total serious failures. (3) The overall average of the failure occurring rate was 6.75 occurrences per 1,000 hours, equaling to about 160 hours of MTBF. (4) Four failures out of five could be repaired by crews on board, this means that the marine engine plant should be always depended on man activity and ability and might be a kind of a man-machine system. Finally as a lot of failures have often occurred due to the unstable design and manufacturing for a newly design marine engines, it is not too much to say that to debug the defect of main engine and automated instrument would lead to make much progress on the reliability and maintainability of marine diesel engine plant.
社団法人日本船舶海洋工学会の論文

10. The Statistics of Failure and Evaluation of Reliability on the Marine Diesel Engine

スポンサーリンク

概要

著者

関連論文

スポンサーリンク