Page 302 - Design for Six Sigma a Roadmap for Product Development

272 Chapter Eight

HW CW

D

1 1 1 1 1 1

φ

Figure 8.20 Proposed connecting rod for valve
2 design.

According to Eq. (8.22) design mapping, the flow, Q, is controlled by
turning the rod ends an angle relative to each other, and the tem-
perature, T, is controlled by the position of the rod, D. However, in this
design, it is important to ensure that the mechanism controlling
moves the valve mechanism equally to avoid affecting the tempera-
ture. The hot and cold flow areas need to be further detailed in the con-
necting rod design.

8.8 Summary
Axiomatic Design (AD) is a general principle for design analysis and
synthesis developed by Prof. Nam P. Suh of MIT. It was developed to
establish a scientific basis for design and to improve design activities
by providing the design teams with a theoretical foundation based on
logical and rational thought processes and tools.
The objectives of Axiomatic Design are to establish a scientific basis for
design activity to augment engineering knowledge and experience, pro-
vide theoretical foundation based on logical and rational thought process
and tools, minimize random search or trial and error process, accelerate
product development process, and improve quality and reliability.
Axiomatic Design is a simple and systematic tool to analyze merits
of existing design and new concept before further developments while
promoting thorough functional requirement analysis at concept level
in Step 6 and beyond of the DFSS algorithm. Section 8.7 provides a
case study in addition to the illustrative examples in other sections.