A Hybrid Method to Predict the Remaining Useful Life of Scroll Wheel of Control Rod Drive Mechanism

Table 5

The comparison between the proposed method and HMM method (unit: day).

Real RUL	RUL based on HMM	Relative error value	RUL based on the proposed method	Relative error value
7	6.83	0.17	6.95	0.05
6.5	6.32	0.18	6.38	0.12
6	5.82	0.18	5.80	0.2
5.5	5.31	0.19	5.62	−0.12
5	4.81	0.19	5.22	−0.22
4.5	4.31	0.19	4.64	−0.14
4	3.80	0.20	4.06	−0.06
3.5	3.31	0.19	3.48	0.02
3	2.82	0.18	3.16	−0.16