RELIABILITY AND MAINTAINABILITY OUTLINE

RELIABILITY AND MAINTAINABILITY OUTLINE - Jenai Davis MAN...

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Jenai Davis MAN 3533 302 RELIABILITY AND MAINTAINABILITY OUTLINE I. History of Reliability a. Reliability dates back to World War II b. Experiences in reliability lead to development of AGREE II. Definitions and Concepts a. Reliability – the ability of a product to perform over an extended period i. Defined as a probability 1. For example, .78 reliability is the percentage of the product that will work properly. ii. Also defined in time iii. Inherent reliability – predicted by product design iv. Achieved reliability – observed during use b. Performance – parameter in the definition of reliability c. Failure – inability to perform as expected d. Functional failure – failure due to manufacturing defects e. Reliability failure – failure due to use f. Operating conditions – parameter in reliability that includes type and amount of usage in the environment g. Most recent development in reliability engineering is Reliability Measurement III. Reliability Measurement a. Defined by number of failures per unit time, Failure Rate (λ) i. Large number of items ii. Tested until failed, failure time recorded, histogram b. Expected life is reciprocal of failure rate c. Non-reparable items are Mean Time to Failure d. Reparable items are Mean Time between failure e. Product life characteristic Curve – cumulative percentage of failures versus failure
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RELIABILITY AND MAINTAINABILITY OUTLINE - Jenai Davis MAN...

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