Table 4.

Recognition results of fault types based on the GHMM; normal condition (NC), inner race defect condition (IRDC), ball defect condition (BDC) and outer race defect condition (ORDC).

Sample No.	Optimal GHMM for NC	Optimal GHMM for IRDC	Optimal GHMM for BDC	Optimal GHMM for ORDC
1	[−0.0842, −0.0412]	[−Inf, −1617.4]	[−172.79, −582.69]	[−Inf, −1949.5]
2	[−Inf, −Inf]	[−2.248, −51.994]	[−94.4, −110.13]	[−Inf, −97.352]
3	[−Inf, −Inf]	[−Inf, −623]	[−108.19, −4.997]	[−Inf, −639.01]
4	[−921.2, −Inf]	[−424.76, −165.2]	[−11.965, −54.34]	[−9.16, −12.445]