Slides - Åbo Akademi

More documents

Recommendations

Info

Hardware vs. Software • Hardware for safety-critical systems is very reliable and its reliability is being improved • Software is not as reliable as hardware, however, its role in safety-critical systems increases • The division between hardware and software reliability is somewhat artificial [J. D. Musa, 2004] • Many concepts of software reliability engineering are adapted from the mature and successful techniques of hardware reliability
Hardware Failures The system is said to have a failure when its actual behaviour deviates from the intended one specified in design documents Underlying faults: the largest part of hardware failures caused by physical wear-out or physical defect of a component • transient faults: the faults that may occur and then disappear after some period of time • permanent faults: the faults that remain in the system until they are repaired • intermittent faults: the reoccurring transient faults
Page 1 and 2: Software Safety Lecture 8: System R
Page 3 and 4: Reliability Definition Reliability:
Page 5: Safety-critical Systems • Pervasi
Page 9 and 10: Failure Rate (ctd.) Classification
Page 11 and 12: Most Important Distributions Discre
Page 13 and 14: Reliability Parameters MTTF: Mean T
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

Create successful ePaper yourself

Delete template?

Save as template?