IV. Reliability Modeling and Prediction
B. Reliability Predictions
1. Part count prediction and part stress analysis (Apply)
Use parts failure rate data to estimate system- and subsystem-level reliability.
Tally up the failure rates for the individual parts of a system should result in a reasonable estimate of the system reliability Sometimes this may work given good data. An improvement is to consider the component level stress, too.
Additional References
Quick Quiz
1-62. During the early design stage, which is the best method to use to predict new device reliability?
(A) part stress analysis
(B) burn-in
(C) parts count
(D) accelerated testing
(A) part stress analysis
Of the options provided only the earliest possible methods, not requiring working prototypes, are the parts count and part stress analysis methods. Part stress analysis attempts to account for the stress experienced by each part providing a little improvement over the part count method.
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