1 Exercise: „Reliability and availability“ Additional task 1: The system with the machines of availability types A, B and C represented below is to be tested for its total availability. The used machine types have the following availabilities: Typ B: V B = 0,95 Typ C: V C = 0,9 The total availability of system is to be V SYS =0,9. For machines of availability tpye A an average time for repairs can be ensured in case of machine failure. Which demands have to be made on the downtime behavior of the machine with availability type A?
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Exercise: „Reliability and availability · MTBF MTBF MTBF h MTBF MTTR MTBF A sys A sys A BC BCunten BCoben C | | K K K K K K K K K Additional task 2: A lifting-sinking station was
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1
Exercise: „Reliability and availability“
Additional task 1:
The system with the machines of availability types A, B and C represented below is to be
tested for its total availability.
The used machine types have the following availabilities:
Typ B: VB = 0,95
Typ C: VC = 0,9
The total availability of system is to be VSYS=0,9. For machines of availability tpye A an
average time for repairs can be ensured in case of machine failure.
Which demands have to be made on the downtime behavior of the machine with
availability type A?
2
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MTBF
hMTBFMTBF
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Asys
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Additional task 2:
A lifting-sinking station was investigated by an analysis of the current state. Thereby, the
following data were gained:
Number of repairs M = 6
Number of failures N = 7
cumulated operating time tE = 520 [h]
cumulated downtime tA = 39 [h]
What is the value with which the availability of the lifting-sinking station can be estimated