Optimal Cost-Effective Maintenance Policy for a Helicopter Gearbox Early Fault Detection under Varying Load

Table 2

Model parameters estimation with EM algorithm.

Parameters	Initial values	First iteration	Second iteration	Last iteration
	0.8	0.6897	0.9187	1.0000
	0.2	0.3103	0.0813
	3	2	2	2
	3	1	2	2
	0.5	0.4063	0.2918	0.2069
	—	−2.48	−1.89	−1.45