Isomap-Based Three-Dimensional Operational Modal Analysis

Table 18

PCA and Isomap by DMA with a real modal damping ratio of 0.05.

Real order	Identified order	DMA
		PCA (MDS)			Isomap
		MAC	Frequencies	Relative error (%)	MAC	Frequencies	Relative error (%)
1	2	0.5395	1052	−0.275	0.5614	1052	−0.275
2	1	0.1402	1143	−0.236	0.1521	1140	−0.498
3	3	0.1928	1225	−1.178	0.1770	1237	−0.210
4	4	0.1213	1434	−0.548	0.1245	1441	−0.062
5	6	0.0005	1877	7.874	0.0003	1889	8.563
7	5	0.0041	1879	0.390	0.0044	1890	0.978