Modal Parameters Identification Method Based on Symplectic Geometry Model Decomposition

Table 1

Comparison of modal parameter identification results.

Model	SVD					SGMD				SGMD-SVD
	Natural frequency	Error (%)	Damping ratio	Error (%)	MAC	Natural frequency	Error	Damping ratio	Error (%)	Natural frequency	Error (%)	Damping ratio	Error (%)	MAC
1	2.204774	17.25	0.128879	20.90	0.904	2.660464	0.15%	0.105204	1.31	2.660789	0.13	0.10789	1.21	0.959
2	6.433347	0.32	0.267495	3.60	0.77	6.39942	0.85%	0.255257	1.14	6.399353	0.85	0.254756	1.33	0.898
3	9.653678	4.12	0.488475	21.30	0.973	9.864816	2.04%	0.396764	1.47	9.864922	2.04	0.407428	1.17	0.952
4	24.27983	70.88	0.20743	63.50	0.964	13.65411	3.98%	0.558576	1.71	13.67084	3.86	0.553462	2.61	0.914
5	56.19371	145.20	0.035751	96.10	0.958	20.79091	9.73%	0.796246	13.14	20.79083	9.73	0.777912	15.14	0.948