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Unformatted text preview: erical models Deterministic approach Figure 1; Uncertainty typology structure. 2.1. Specified vs. unspecified geometrical variations The first level of the typology distinguishes between user specified and unspecified geometrical variations. The user specified class, as its name plainly implies, contains uncertainties in the form of tolerances and clearances which are typically specified on a drawing by the designer and which become ultimately part of the product requirement. Specified variations are generally cumulative. Indeed, according to the standards, form tolerances are included in orientation tolerance zones, themselves being contained within location tolerance zones. The envelope principle and the Maximum Material Condition also support the same idea; additional specifications are not likely to change the overall size of the uncertainty zone but rather to add additional layers within it. Unspecified variations obviously capture all other uncertainties and variations that do not fall in the first category outlined above. As opposed to the specifie...
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