By R. D. Leitch

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**Sample text**

One solution to the problem of improving the reliability for both modes, is to have a 'one-out-of-two-twice' arrangement. 16. 16 Valve systems: 1 out of 2 twice The old arrangement was a 'one-out-of-two' system. Now there are two of them and they both must function properly if the system is to be safe. 17. 99995 This is still extremely high! 18, and the reliability is: 2 2 1 - ( 1 - 0 . 99996 which is a great improvement. 19. 96. 21 (redundancy at component level).

T o answer that question we must know how long the liner will be at sea. The time between planned maintenance is to be six weeks, we are told. That is 1008 hours. 0054, then the reliability after 1008 hours is R = e x p ( - 0 . e. there is almost certain to be a failure in such a time. H o w many failures are there likely to be? 5 for each of the four generators. There may be more, of course, and Poisson probability paper can be used to determine the risk. Another problem that should be addressed at this time is that of reliability demonstration testing.

1 Calculate the M T T F , the failure rate, the reliability at 1000 h and the time at which 15 % of a large number of similar components subjected to similar stresses could be expected to have failed. 1 + l l . 15= 1 - e x p - r / 8 . 14 = - l n ( 0 . 5) Twenty components with C F R were observed being used in a high stress environment. 8 while the remaining 13 were still functioning. Calculate the M T T F , the failure rate, the time at which the reliability is 9 5 % and the reliability after 50 h of use.