Reliability Modelling of CNC Machine Tools Based on the Improved Maximum Likelihood Estimation Method

Table 4

Test parameters for four-factor and four-level orthogonal simulation conditions.

Number	Number of machine tools	Test time; T/h	Ideal parameters		MRCT
			1	5		1000	800	0.8	0.81
2	5	1400	1200	1.2	0.80
3	5	1800	1600	1.6	0.82
4	5	2200	2000	2.0	0.84
5	10	1000	1200	1.6	0.90
6	10	1400	800	2.0	0.67
7	10	1800	2000	0.8	0.84
8	10	2200	1600	1.2	0.74
9	20	1000	1600	2.0	0.95
10	20	1400	2000	1.6	0.91
11	20	1800	800	1.2	0.57
12	20	2200	1200	0.8	0.67
13	50	1000	2000	1.2	0.94
14	50	1400	1600	0.8	0.84
15	50	1800	1200	2.0	0.73
16	50	2200	800	1.6	0.49