View/Open - Scholarly Commons Home

Nominal is best
Larger is better
S / N NB 10log
10[ S
n is the number of size of a sample and S 2 is the variance of that sample. A signal to
ratio is calculated for each treatment combination. Taguchi claims that treatment
combination with largest true average signal-to noise ratio produces the least
variation in the response variable. This can identify the factors that can reduce
variation.
4.5 Experimental design for CLFDM experiments
Based on the extensive research done above, Taguchi‟s L8 design was selected to
come up with a strategic design for the series of experiments. While the basic part
for the experiments is the thin shell type part as already stated, the experimental
design includes curvature of the part, speed and style of deposition as critical
factors. The design matrix is built based on the Taguchi L8 orthogonal array
considering each of these factors at two different levels. The design matrix is shown
in Table 4.1.
S /
N
LB
n 1 1
10log
10
2
n
i1 Yi
2
]
93