Question

Three communication channels in parallel have independent failure modes of 0.1 failure per hour. These components must share a common transceiver. Determine the MTTF of the transceiver in order that the system has a reliability of 0.85 to support a 5- hr. mission. Assume constant failure rates.

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Answer:

the MTTF of the transceiver is 50.17

Given the data in the question;

failure modes = 0.1 failure per hour

system reliability = 0.85

mission time = 5 hours

Now, we know that the reliability equation for this situation is;

R(t) = [ 1 - ( 1 - )³]

so we substitute

R(5) = [ 1 - ( 1 - )³] = 0.85

[ 1 - ( 1 - )³] = 0.85

[ 1 - ( 0.393469 )³] = 0.85

[ 1 - 0.06091 ] = 0.85

0.9391 = 0.85

= 0.85 / 0.9391

= 0.90512

MTTF = 5 / -ln( 0.90512 )

MTTF = 50.17

Therefore, the MTTF of the transceiver is 50.17