Design and Stress Analysis of Extraterrestrial ... - The Black Vault

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Fig. 1.19. Bar graphs of accumulated
failures. Points a-d correspnnd to
the acceptance of solutions which
improved the work of the module; point
d corresponds to the end o,' finishing.
KEY: (1) Quantity of accumulated
failures, n; (2) Total number of tests
examined, Nk.
* With the aim of rapidly revealing the weakest spots in the
motor during experimental processing, it is advisable to plot such
curves for individual units, aggregates, processes, techniques,
bench test conditions, and for other reasons affecting reliability
in the module development process as shown in Fig. 1.20.
Thus, the quantity P 4 dhar~cterizes the validity of the
reference data at the Ni-th moment of testing. At the end of
the development work, when failures for any reasons cease, the
module achieves the full required reliability PM*
Using the graph in Fig. 1.20, we can, in certain limits,
predict the future course of finishing work and, if necessary,
pose the problems of the necessity for accepting specific solutions
capable of increasing the reliability level.
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