Product Form Design Model Based on Multiobjective Optimization and Multicriteria Decision-Making

Table 4

Design variables for cars’ ratio.

Design variables	Diagrammatic sketch	Level 1	Level 2	Level 3
X6; (the ratio of car’s height to car’s length, H1/L1)		0.32 (x61)	0.37 (x62)	0.42 (x63)
X7; (the ratio of car’s top part to car’s height, H2/H1)		0.27 (x71)	0.30 (x72)	0.33 (x73)
X8; (the ratio of wheel’s height to car’s height, H3/H1)		0.40 (x81)	0.45 (x82)	0.50 (x83)
X9; (the ratio of chassis’s height to wheel’s height, H4/H3)		0.20 (x91)	0.35 (x92)	0.50 (x93)
X10; (the ratio of fore part’s length to car’s length, L2/L1)		0.18 (x101)	0.24 (x102)	0.30 (x103)
X11; (the ratio of rear part’s length to car’s length, L3/L1)		0.09 (x111)	0.13 (x112)	0.17 (x113)
X12; (the ratio of front overhang’s length to car’s length, L4/L1)		0.14 (x121)	0.18 (x122)	0.22 (x123)
X13; (the ratio of rear overhang’s length to car’s length, L5/L1)		0.17 (x131)	0.20 (x132)	0.23 (x133)