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Analysis, diagnosis and prognosis methods used

Description :
After having called again the different stakes relative to industrial maintenance and defined the different maintenance types, the paper shows the interest of preventive maintenance strategy of SSC (systems-structures-components). The objectives are to maintain or improve the safety level and to reduce unavailability and maintenance costs. It is proved that field data analysis of failures and degradations, of inspection and health monitoring data is essential. Indeed, this analysis, in a first step, permits to express a diagnosis about the physical status of a SSC, then to forecast its future behavior. The chapter will present some of the methods presently used in the industry. These methods are mainly based on the available knowledge from operation feedback (physical measures, historical data), from expertise and from reliability modeling or physical-probabilistic modeling. It should be added that these methods will be dealt with many R&D works .