The Application of the Design of the Experiment to Investigate the Stability of Special Equipment

Table 3

The true values of the influencing factors correspond to the range of change’s upper and lower limits.

Input factors	The value of factors at the center of the plan	Upper limit (“+”)	Lower limit (“-”)
Z1, MPa	30	33	27
Z2	1.055	1.065	1.045
Z3, times of caliber	4.00	4.40	3.60
Z4, MJ/kg	1.00	1.10	0.90
Z5, MPa.s	0.81	0.891	0.729
Z6	0.2210	0.2486	0.1934
Z7, dm^3/kg	1.00	1.10	0.90
Z8, kg/m^3	1600	1760	1440
Z9, kg/dm^3	0.554	0.6149	0.4931