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Reliability-based optimum inspection and maintenance proceduresThe development of reliability-based optimum inspection and maintenance schedules for engines needs an understanding of the fatigue behavior of the engines. Critical areas of the engine structure prone to fatigue damage are usually identified beforehand or after the fleet has been put into operation. In these areas, fatigue cracks initiate after several flight hours, and these cracks grow in length until failure takes place when these cracks attain the critical lengths. Crack initiation time and its growth rate are considered to be random variables. Usually, the inspection (fatigue) or test data from similar engines are used as prior distributions. The existing state-of-the-art is to ignore the different lengths of cracks obserbed at various inspections and to consider only the fact that a crack existed (or did not exist) at the time of inspection. In this paper, a procedure has been developed to obtain the probability of finding a crack of a given size at a certain time if the probability distributions for crack initiation and rates of growth are known. Application of the developed stochastic models to devise optimum procedures for inspection and maintenance are also discussed.
Document ID
19750050072
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nanagud, S.
(Georgia Institute of Technology Atlanta, Ga., United States)
Uppaluri, B.
Date Acquired
August 8, 2013
Publication Date
April 1, 1975
Subject Category
Aircraft Propulsion And Power
Accession Number
75A34144
Funding Number(s)
CONTRACT_GRANT: NGR-11-002-169
Distribution Limits
Public
Copyright
Other

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