Slides - Åbo Akademi

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Most Important Distributions Discrete distributions: • binomial distribution • Poisson distribution Continuous distributions: • exponential distribution • normal distribution • lognormal distribution • Weibull distribution • gamma distribution • Pareto distribution
Exponential Distribution The distribution gives: • failure density: f (t) = λe −λt • reliability function: R(t) = e −λt • constant failure and repair rates: λ(t) = λ and µ(t) = µ • MTTF = 1 λ • MTTR = 1 µ The probability of a system working correctly throughout a given period of time decreases exponentially with the length of this time period.
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 and 12: Most Important Distributions Discre
Page 13: Reliability Parameters MTTF: Mean T
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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