TAILIEUCHUNG - Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 33

Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 33 studies the combination of various methods of designing for reliability, availability, maintainability and safety, as well as the latest techniques in probability and possibility modelling, mathematical algorithmic modelling, evolutionary algorithmic modelling, symbolic logic modelling, artificial intelligence modelling, and object-oriented computer modelling, in a logically structured approach to determining the integrity of engineering design. . | Theoretical Overview of Availability and Maintainability in Engineering Design 303 of systems availability. Maintainability on the other hand is similar to reliability in that both relate the occurrence of a single type of event over time. It is thus necessary to consider in closer detail the various definitions of availability Conlon et al. 1982 . Inherent availability can be defined as the prediction of expected system performance or system operability over a period which includes the predicted system operating time and the predicted corrective maintenance down time . Achieved availability can be defined as the assessment of system operability or equipment usage in a simulated environment over a period which includes its predicted operating time and active maintenance down time . Operational availability can be defined as the evaluation of potential equipment usage in its intended operational environment over a period which includes its predicted operating time standby time and active and delayed maintenance down time . These definitions indicate that the availability of an item of equipment is concerned either with expected system performance over a period of expected operational time or with equipment usage over a period of expected operational time and that the expected utilisation of the item of equipment is its expected usage over an accountable period of total time inclusive of downtime. This aspect of usage over an accountable period relates the concepts of availability to utilisation of an item of equipment where the accountable period is a measure of the ratio of the actual input to the standard input during the operational time of successful system performance. The process measure of operational input is thus included in the concept of availability. By grouping selected availability techniques into these three different qualitative definitions it can be readily discerned which techniques relating to each of the three terms can be logically applied .

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