Download - Chapter 3 Maintainability and Availability
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Chapter 12Maintainability and Availability
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12.1 introductionAvailability analysis of the system requires a knowledge:How the components are functional connected.The failure process of the component.The method of operation and the definition of the failure.The repair or maintenance police.
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12.2 Maintainability12.2.1 ConceptMaintainability M(t) : the probability of repairing a failed component or system in a specified period of time.Two kinds:Preventive maintainabilityCorrective maintainability
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12.2.2 Preventive maintainabilityreliability of the system
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System Reliability
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Example 12.2 derive the condition under preventive maintenance is beneficial to the
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12.2.3 imperfect maintenance
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12.2.4 Repair time distribution
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12.2.5 Unrepaired failure
Number of unrepaired failure in time
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12.2.6 Optimum replacement strategyThe total number of the times the component is replaced is given by
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12.2.7 Spare parts requirementThe probability of having n failure in time t :
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Example 12.9 Three kind of component in an system : 20 in type A (failure rate 0.002), 130 in type B (failure rate 0.0001), and 100 in type C (failure rate 0.0005). Find the number of spare parts required to cover the mission period 30 days and 99 percent of probability
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12.3 Availability12.3.1 definition
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3. Steady state availability
4. Inherent availability
Achieved availability
Operational availability
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12.3.2 Availability Analysis
12.3.3 Development of model
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12.3.4 system with single component
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12.3.5 Series system
One repair person :
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Two repairperson
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12.3.6 Parallel system
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One repair person
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Two repair persons
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12.4 Optimization Approach