Note that the absolute value sum of the contributions equals 100%. From these charts we can visually gage the percentage contributions. Then a plan can be formulated to attack those inputs driving quality (if possible) and pay less scrutiny to the others.įigure 12-1 displays Sensitivity Charts produced from a CB simulation. If an engineer knows that some inputs contribute more (or even way more) to variation output than others, would that be of use? Absolutely.
(WCA does not.) These contributions are reported as percentages whose total from all input contributions must equal unity (100%). What if a sigma score of three is not good enough? What does the design engineer do to the input standard deviations to comply with a 6 sigma directive?īoth RSS and MC analysis provide information on Sensitivity Contributions. In the case of the one-way clutch example, the current MC quality prediction for system outputs provide us with approximately 3- and 6-sigma capabilities (Z-scores).
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