Robust Die Compensation in Sheet Metal Design through the Integration of Dual Response Surface and Shape Function Optimization

Table 4

Coded levels adopted for control and noise variables according to the central composite design.

Coded level	α1	α7	α8	(GPa)	t (mm)
-s	-634.63	-157.21	-132.598	1.034	1.410
-1	-591.16	-113.74	-89.131	1.072	1.462
0	-559.63	-82.21	-57.598	1.100	1.500
1	-528.09	-50.67	-26.064	1.128	1.538
S	-484.63	-7.21	0.000	1.166	1.590