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Chapter 12 Maintainability and Availability. 12.1 introduction Availability analysis of the system requires a knowledge: (1)How the components are functional.

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Presentation on theme: "Chapter 12 Maintainability and Availability. 12.1 introduction Availability analysis of the system requires a knowledge: (1)How the components are functional."— Presentation transcript:

1 Chapter 12 Maintainability and Availability

2 12.1 introduction Availability analysis of the system requires a knowledge: (1)How the components are functional connected. (2)The failure process of the component. (3)The method of operation and the definition of the failure. (4)The repair or maintenance police.

3 12.2 Maintainability Concept Maintainability M(t) : the probability of repairing a failed component or system in a specified period of time. Two kinds: Preventive maintainability Corrective maintainability

4 Preventive maintainability reliability of the system

5 System Reliability

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10 Example 12.2 derive the condition under preventive maintenance is beneficial to the

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13 imperfect maintenance

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16 Repair time distribution

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22 Unrepaired failure Number of unrepaired failure in time

23 Optimum replacement strategy The total number of the times the component is replaced is given by

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25 Spare parts requirement The probability of having n failure in time t :

26 Example 12.9 Three kind of component in an system : 20 in type A (failure rate 0.002), 130 in type B (failure rate ), and 100 in type C (failure rate ). Find the number of spare parts required to cover the mission period 30 days and 99 percent of probability

27 12.3 Availability definition

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29 3. Steady state availability 4. Inherent availability 5.Achieved availability 6.Operational availability

30 Availability Analysis Development of model

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34 system with single component

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39 Series system One repair person :

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43 Two repairperson

44 Parallel system

45 One repair person

46 Two repair persons

47 12.4 Optimization Approach


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