Unformatted text preview: ponents, the overall failure rate for the system is the sum of the individual failure rates ( ³ i ) for each of the k components: ³ = k ± i = ³ i The mean time between failures (MTBF) is given by: MTBF = ± ² e − ³t dt = 1 ³ Similarly, the repair time (R) is also assumed to obey an exponential distribution and is given by: P±R > t² = e − ´t where µ is the repair rate . Hence, the mean time to repair (MTTR) is given by: MTTR = 1 ´ The fraction of time that a system is operating normally (failure-free) is the system availability and is given by: System availability = MTBF MTBF + MTTR...
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- Spring '08
- Normal Distribution, Probability theory, Failure rate, overall failure rate, exponential failure law