Identification of Engine Inertia Parameters and System Dynamic Stiffness via In Situ Method

Table 3

Effects of rigid shapes on the identification of inertia parameters.

		Theory	Ignore rigid shapes	Error (%)	Consider rigid shapes	Error (%)
Mass (kg)	m	160.6	161.3	−0.44	163.7	−0.44
Centre of gravity (mm)	xc	147.0	147.0	0.00	144.8	0.00
	yc	152.3	151.1	0.79	148.4	0.79
	zc	112.9	112.9	0.00	111	0.00
Moment of inertia (kgm^2)	Jx	7.74	7.79	−0.65	7.78	−0.65
	Jy	7.71	7.70	0.13	7.68	0.13
	Jz	9.86	9.89	−0.30	9.87	−0.30
Product (kgm^2)	Jxy	3.64	3.65	−0.27	3.65	−0.27
	Jxz	2.75	2.72	1.09	2.71	1.09
	Jyz	2.42	2.38	1.65	2.38	1.65