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Reliability Analysis and Maintenance Strategies for Complex Systems and Components

Evaluation of reliability and maintenance strategies for complex systems.

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    Reliability Analysis and Maintenance Strategies for Complex Systems and Components A power supply consists of three rectifires in series. Each rectifier has a Weibull failure didtribution with  eqaul to 2.1. However they have different characteristics lifetimes given by 12,000 hr, 18,500 hr and 21,500 hr. Find the MTTF and the design life of the power supply corresponding to a reliability of 0.90. Given values: failure didtribution with  eqaul to 2.1. with different life times as 1 2 3 2.1                       3 1 2 2.1 2.1 2.1 2.1 1 2 3 1 2 3 / / / 1 2 3 /12,000 /18,500 / 21,500 1 1 12000 185 2.1 12, 000 ; 18,500 ; 21,500 for weibul distribution, R t t Q t Q t Q t t t t Q hrs Q hrs Q hrs R R R e e e e e e e                                                                       2.1 2.1 9 2.1 9 1 00 21500 1 1 1 12000 18500 21500 0 4.6 10 0 4.6 10 2.1 9 , Design T for R t 0.9 0.9 ln 0.9 4.6 10 3196.16 3197 . t t t Now MTTF e dt e dt e t t t hrs                                        A system has two failure modes. One failure mode due to external conditions, has a constant failure rate of 0.07 failure per year. The second attributed to wearout, has a Weibull distribution with a characteristics life of 10 year and a shape parameter of 1.8. Determine the system reliability for a design life of 1 year. Find by trial and error the median time of failure

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