Remaining Useful Life Estimation of Fan Slewing Bearings in Nonlinear Wiener Process with Random Covariate Effect

Table 2

Parameter estimation of the M1model and M2model.

Measurement time (×10^3 min)	M1 Model						M2 Model
						r			r
0.3	3.6591	0.5331	3.6826	0.4502	0.4316	0.8963	2.8723	0.9989	0.5510
2	1.9072	0.2033	1.8821	0.1752	0.2530	0.5853	1.4816	0.9561	0.6808
4	1.5077	0.1827	1.5075	0.1752	0.2461	0.2003	0.8764	0.8249	0.5099