Slides - Åbo Akademi

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Repair Rate The repair rate expresses the probability that a system, failed for a time t, recovers its ability to perform its function in the next time unit The repair rate of the system can be defined as: where µ(t) = g(t) 1 − M(t) – g(t) is the (repair) probability density function and – M(t) is the system maintainability
Reliability Parameters MTTF: Mean Time to Failure, i.e., the expected time that a system will operate before the first failure occurs (often term MTBF – Mean Time Between Failures – is used for repairable systems) MTTR: Mean Time to Repair, i.e., the average time taken to repair a system that has failed MTTR includes the time taken to detect the failure, locate the fault, repair and reconfigure the system. MTTF = ∫ ∞ 0 R(t)dt MTTR = ∫ ∞ 0 (1 − M(t))dt Availability of a repairable systems is defined as MTTF MTTF + MTTR
Page 1 and 2: Software Safety Lecture 8: System R
Page 3 and 4: Reliability Definition Reliability:
Page 5 and 6: Safety-critical Systems • Pervasi
Page 7 and 8: Hardware Failures The system is sai
Page 9 and 10: Failure Rate (ctd.) Classification
Page 11: Most Important Distributions Discre
Page 15 and 16: Exponential Distribution The distri
Page 17 and 18: MTTF Example A system with a consta
Page 19 and 20: Example: Failure Rate Calculation F
Page 21 and 22: Series Systems Such a configuration
Page 23 and 24: Series-Parallel Combinations The mo
Page 25 and 26: M-of-N Arrangement A system consist
Page 27 and 28: Failure rate The term failure inten
Page 29 and 30: Design diversity Each variant of so

Slides - Åbo Akademi

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