Research On Theory Of Reliability Centered Maintenance Decision Of Engine Production Line

In order to improve the condition of low efficiency of device maintenance and high cost, and to improve the utility life and productivity of device, the best project of maintenance decision was made in this paper by the way of analysis on reliability centered maintenance decision.1. IntroductionAlong with the constant improvement of the production automation degree, Maintenance is more important than before in modern enterprises. The expense of failure maintenance and machine stall is quite expensive in modern enterprises. Therefore, the failure control and the prevention are the main question in the modern enterprise. And reliability centered maintenance is exactly one of the key means of solving this subject. The trend of internationalization of manufacturing in china gets more apparently. The productivity and quality of productions are two important factors to qualify manufacturing in china in international market. The maintenance decision plays an important role in keeping adequate competition of manufacturing in china in international market and stability of production as the most basic factor of assuring the quality of production.2 . Application of fuzzy Petri net in failure diagnosisMaintenance man judges possible failure course generally by experience, even try blindly sometimes, which influence device in good condition severely.Fuzzy Petri net is based on its function of knowledge expression and logic reasoning, and is used in failure diagnosis and expression and obtaining of knowledge popularly. FPN model system finds its opposite Indication storehouse in FPN model according to known failure phenomena. Firstly, findthe path having biggest reliability and make a marker, then query reversedly. According to the principle of biggest reliability, system finds opposite path. The system stops query when get to the initial storehouse, otherwise, continue to query reversedly till getting to the initial storehouse. If customize require "very real", the system which is decided fuzzy scale in advance automatically calculate the reliability of that proposition. The proposition is active when the threshold is exceeded. If the proposition is not active, failure course will be hunted in other paths till it is found.3 .Judging device rank by fuzzy synthesis judgment Fuzzy synthesis judgment is also named fuzzy synthesis decision, a synthesis evaluation of some of thing made by taking influence of factors containing kinds of fuzzy into account. During course of maintenance decision of device, device ranking is very important because that device are ranked differently by different standards is good to adopting different maintenance decision. The device ranking is influenced by many factors, and device are ranked by steps such as establishing mass F of factors, reasonable mass C of comment, comment matrix R and issuing synthesis judgment by suitable fuzzy factor etc.4 .Analysis on maintenance decision...