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6 First Article Testing Protocols for Resistance to Penetration: Statistical Considerations and Evaluation of DoD Test Plans
Pages 39-47

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From page 39...
... This may not provide sufficient incentive for TEST PLANS FOR RESISTANCE TO PENETRATION the manufacturer to sustain current penetration-probability As described in Chapter 4, the RTP test protocol specil ­evels.
From page 40...
... the 1-out-of-40 (1, 40) plan in Figure 6-1 and decided that In Figure 6-1 and subsequent plots of OC curves in this the acceptance probability of 0.10 when θ = 0.10 is too high.
From page 41...
... 1.0 0.8 Probability of Acceptance Statistical Approaches to Selecting (c, n) -Test Plans 0.6 The conventional statistical approach for choosing a test plan is to specify two points on the OC curve: (1)
From page 42...
... binomial distribution. Therefore, the OC curves computed test plan.
From page 43...
... The two OC curves cross 0.12. So, this plan does not strictly satisfy the 90/90 property at about θ = 0.092.
From page 44...
... To evaluate a plan, one needs to consider the whole OC curve, not just one point that may have been used to specify the plan. The DOT&E plan focuses on the point at which θ = 0.10.
From page 45...
... plan is used, for a total of 240 shots. Figure 6-7 provides a comparison of the OC curves of 2The Army's hybrid plan essentially separates the procurement decision the hybrid plan with its component plans and also the legacy from the characterization analysis that is made possible by the complete set of 240 shots.
From page 46...
... of-80 (1, 80) plan would have an OC curve with comparable (slightly lower)
From page 47...
... denote the probability The two plans have virtually identical OC curves. This is of a helmet failure.


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