Tolerance Stack Analysis Methods A Critical Review
نویسنده
چکیده
This document reviews various ways of performing tolerance stack analyses. This review is limited to assembly criteria which are linear or approximately linear functions of the relevant part dimensions. Beginning with the two extreme cornerstones, namely the arithmetic or worst case tolerance stack and the statistical or RSS tolerance stack method, various compromises or unifying paradigms are presented with their underlying assumptions and rationales. These cover distributions more dispersed than the commonly assumed normal distribution and shifts in the means. Both worst case and statistical stacking of mean shifts are discussed. The latter, in the form presented here, appears to be new. The appropriate methods for assessing nonassembly risk are indicated in each case. ∗ P.O. Box 3707, MS 7L-22, Seattle WA 98124-2207, e-mail: [email protected]
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