Eccentricity Parameters Identification for a Motorized Spindle System Based on Improved Maximum Likelihood Method

Table 3

Parameter identification means and 95% confidence interval.

Identification parameter	Different uncertainties (%)	Mean	Confidence interval	Standard deviation
Motor eccentricity (μm)	1	19.9997	[19.9106, 20.0888]	1.5e − 5
	3	19.9995	[19.7059, 20.2932]	2.5e − 5
	5	20.0000	[19.4178, 20.5822]	0
Grinding wheel eccentricity (μm)	1	100.5923	[100.1375, 101.0471]	5.923e − 3
	3	100.9543	[98.4023, 103.5063]	9.543e − 3
	5	100.0314	[99.4962, 100.5665]	3.14e − 4