Page 278 - Design for Six Sigma a Roadmap for Product Development

248 Chapter Eight

DP 2.2 DP 1.2
DP 2.3 DP 1.3
DP 2.4 DP 1.4
DP 6.1 fluid media
DP 6.2 K factor
DP 4.1 absorption mechanism
DP 4.2 releasing mechanism
DP 4.3 dissipation mechanism
DP 3.1 case
DP 3.2 internal components
DP 5.1 apply/release friction elements
DP 5.2 variator position
DP 5.3 flow rate of primary pulley
DP 5.4 pump excess discharge flow rate restriction
DP 5.5 modulate bypass clutch
DP 5.6 pump flow directing

The resultant design equation is given by Eq. (8.5). By definition, this
design equation is redundant; some DPs need to be fixed. The criteria
used to fix the extra DPs include cost, complexity, and variability opti-
mization. This represents an opportunity for the designer to simplify
the solution entity. Note that the logarithms of certain FRs were tak-
en to achieve the additivity requirement of the axiomatic design for-
mulation (Chap. 6). The deployment of axiom 1 enables Six Sigma
targets for the design functional requirements. It presents a systematic
approach for establishing the potential Six Sigma capability at the con-
ceptual level in the designed system by reducing the coupling vulnera-
bility between the functional requirements (FRs), represented by the
array y. The equation y f(x) is used where y is the array of function-
al requirements and x is the array of design parameters or process vari-
ables. It is by controlling the x terms that both the variation reduction
and target adjustment objectives of y to Six Sigma level can be achieved.

(8.5)