Utilisation rate

4 important questions on Utilisation rate

What is the definition of the utilisation rate?

Fraction of the available time in which a machine is used for production (including operating times).

What are the 2 possible formulas for the utilisation rate?

  • Utilisation rate = total operating time / total available time
  • Utilisation rate = actual output / design capacity

How can the utilisation rate ρ for a workstation consisting of n identical, parallel servers be computed?

ρ = λ / (nµ)
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What are 2 difficulties/things to pay attention to by calculating the utilisation rate?

  • Carefully read whether the inter-arrival time or the arrival rate has been given (similarly: service time versus service rate).
  • Always locate the bottleneck before you start calculating!
Proces 2 heeft een utilisation van meer dan 1. Kan natuurlijk niet, je kunt niet meer dan 100% je best doen, die zit gewoon vol aan zn max en ontstaat een wachtrij voor.
NB de onderste regel: why 10: omdat service rate van process 2 10 minutes is!!

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