Formulas and calculation basis

Contents

MTTR Calculation

With the parameters availability and MTTR, random distributions for disturbance durations (Erlang function) and distance of disturbances (negative exponential function) are automatically determined in the background

The general formula is:

Availability = MTBF : ( MTBF + MTTR)

MTBF = Availability * MTTR / (1-Availability)

Level related to working time (when the object is working on a product, the product is on the input and the output is not blocked)

With:

MTTR: Mean-time-to-repair

MTBF: Mean-time-between-failures

Failure behavior

Definitions:

20240905_Berechnung_Ausfallverhalten_3

Figure 1 - Definition Failure behavior

Calculations:

20240905_Berechnung_Ausfallverhalten_1

Figure 2 - Calculation Failure behavior

20240905_Berechnung_Ausfallverhalten_2

Figure 3 - Calculation Failure behavior