Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions

Table 1

Reliability parameters of the NC machine tools under each covariate.

Covariates		Shape	Scale	MTBF
Fc(KN)	Nh(n/h)
0.35	2	1.2121	1156	1084.6
0.43	17	1.2121	584.5916	548.5002
0.54	4	1.2121	891.4274	836.4116
0.78	10	1.2121	557.8750	523.4331
0.81	4	1.2121	691.2005	648.5274
0.84	6	1.2121	619.7461	581.4844
1.03	14	1.2121	374.9816	351.8384
The method in [1]		1.1468	644.8311	614.1914