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Article | REF: SE4074 V1

Reliability block diagrams

Author: Jean-Pierre SIGNORET

Publication date: February 10, 2017

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2. Main assumptions and mathematical bases for BDFs

From a mathematical point of view, a BDF is an acyclic directed graph, i.e. it has one input and one output, and no loops or feedback. It is based on the following fundamental assumptions:

  • 1) the system has only two states (e.g. on/off);

  • 2) blocks have only two states (e.g. on/off);

  • 3) the BDF represents the logic function linking the operating state of the system to the operating states of its blocks;

  • 4) the blocks are independent of each other.

Note :

point 4) implies, in particular, that the blocks behave independently of each other over time.

The two states of the blocks or system can also...

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Main assumptions and mathematical bases for BDFs
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