008mm however the sheet thickness showed a standard

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Unformatted text preview: c (α ) and uc ( L) are the combined uncertainties of quantities α and L respectively, which are estimated by u ( f ) = ∑ c u ( x ) . With i ranging from 1 to N, ci and u ( x ) are respectively the 2 N 2 2 c L j = f L , j ( ∆ LU , ∆ G X , ∆ B A, ∆ X P ) i =1 i i i sensitivity coefficients and the standard uncertainty of the influencing factors xi . According to [GUM, 1992], with i = 1 to N , ci ’s are calculated by: ci = ∂f ∂xi (8) In other words, the sensitivity coefficients are determined based on the function f expressing the quantity of interest. Substituting equations (2) and (5) into (8) allows estimating the sensitivity of the uncertainty of the bend angle and bend lengths to those of the influencing factors, as expressed in (9) and (10). {cc cV (α ) = 1 2 (1 A + 1 B )(YP + s ) cXp (α ) = (1 A −1 B )(YP + s ) cζ (α ) = −1 (9) cYp (α ) = − ((V 2 + ∆X P ) A − (V 2 − ∆X P ) B ) cs (α ) = − ((V 2 + ∆X P ) A + (V 2 − ∆X P ) B ) 2 2 2 2 and...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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