a complex machine has a high number of failures. The time to failure was found t

Question

a complex machine has a high number of failures. The time to failure was found to be lognormal with s=1.25. Specifications call for a reliability of 0.95 at 1000 cycles.

a, Determine the median time to failure that must be achieved by engineering modifications to meet spec. Assume changes do not affect the shape parameter s

b, what is the correspondence MTTF and standard deviation?

c, If the desired median time to failure is obtained, what is the reliability during the next 1000 cycles given it has operated for 1000 cycles? Share:by email on facebook on twitter flag question for abuse

Explanation / Answer

a, R(1000)= 1 - f(1/1.25ln(1000/Tmed) =7816.18cylcles

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