Free-Decay Nonlinear System Identification via Mass-Change Scheme

Table 3

Identified modal masses of the 4-DOF system.

Mode	Identified modal mass (kg)	Theoretical modal mass (kg)	Difference (%)
1	31.634	31.648	0.046
2	3.977	3.982	0.137
3	1.061	1.066	0.488
4	7.746	7.778	0.412