Model
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Description
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Lambda Tau
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This model approximates the probability of failure and asymptotic unavailability.
A = λτ
τ =mission time to MTTR
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Average Unavailability (approximately)
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This model approximates the average unavailability.
A =λτ/ 2
τ =time between tests (inspection interval)
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Probability of Failure
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This model uses Tau as the mission time.
A = 1 – exp{–λτ}
τ =mission time to MTTR
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Asymptotic Unavailability
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This model uses asymptotic behaviour.
A= λτ /(λτ + 1)
τ =MTTR
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Average Unavailability
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This models uses average unavailability over 0 and Tau.
A=1+ (exp{–λτ} – 1)/ λτ
τ =time between tests (inspection interval)
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