Page 320 - Design for Six Sigma a Roadmap for Product Development

290 Chapter Nine

5. Because of the harmful function, we have to add a supporting func-
tion, namely, the chain from “electricity” to “fan” and end with lens
and film. This function is a correcting function to compensate for
the negative effect of harmful function.

Substance field functional models. In TRIZ methodology, the substance
field model is also a popular model for functional modeling and func-
tional analysis. In the substance field model, there are three essential
elements. Figure 9.4 illustrates the template for the substance field
model: These three elements are:

Substance 1 (S1): Article, which is equivalent to “object” in functional
analysis diagram
Substance 2 (S2): Tool, which is equivalent to “subject” in functional
analysis diagram.
Field (F): Represents energy field between the interaction of S1
and S2.

We can give the following two simple examples of substance field
models:

■ A vacuum clear cleans a carpet:
S1—carpet (an article)
S2—vacuum cleaner (a tool)
F—cleaning (mechanical field)
■ A person is painting a wall:
S1—wall (an article)
S2—person (a tool)
F—painting (chemical field)

The substance field model may look complicated for TRIZ beginners.
However, it illustrates that “substances” and “fields” are essential
building blocks for any function.

Field
F

Figure 9.4 Substance field model.
S1 S2
Article Tool