triple modular redundancy

[prrmtn]

The typical example to explain triple modular redundancy is the voting circuit system.

The example I am speaking of consists of three identical units (logic or binary) feeding into a common voting system. The value of the output is determined by the majority voting.

The single unit reliability is R and the reliability of the voting system is Rv.

The system reliability is Rs=R^2(3-2R)Rv

My question is, if I am given the reliability of the voting system to be .98 how do i find the crossover reliability of a single unit?

[Pantelis]

Not sure I follow ... are you asking how do I solve for R given Rv but without knowing Rs?

[prrmtn]

Yes that is exactly what I am looking for.

[Pantelis]

Well ... how about the trivial answer .. there are an infinite number of solutions... (one equation two unknowns)

In other words you need more information ... in this case you need to define Rs.