The design engineer in question #3 needs to improve the overall system reliability by adding another part in parallel to the unit calculated in question #3. The objective is to achieve an overall system reliability of 99.95%. What reliability must the parallel part have to meet this objective?

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Quizplus · Accepted Answer

(R_S = R₁* R₂* R₃*…… R_n) 99.9% = 99.99%*x; x = 99.95%/99.99% = 99.96 R_P =1 - [P(1^st fails)][P(2^nd fails)] 99.96 = 1-[.0009*x]; P(2^nd fails)=(1-.99.96)/.0009 = 44.5%

The Design Engineer in Question #3 Needs to Improve the Overall