1. A system has two failure modes, One mode is caused by external environmental events where the value of the failure value is a constant of -0.008 per year. The second failure mode is characterized by wearouts, which have a Weibull distribution with 10-year age characteristics and shape parameters - 1.8 The system life is designed for 5 years.
a) Determine system reliability
b). If Preventive Maintenance is used in wearout failure mode restoration to get good new conditions, calculate with trial and error, maintenance intervals required for system reliability are 0.95 (second excess failure mode) Assume there is no maintenance inclusion failure.
c) If this number 0.005 is the maintenance probability of the cause of failure, how many maintenance intervals are needed to adjuse the expected reliability of 0.95 2
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