Isomap-Based Three-Dimensional Operational Modal Analysis

Table 13

RDT and NExT results with a real modal damping ratio of 0.03.

Real order	Identified order	Real modal ratio = 0.03
		PCA (MDS)				Isomap
		LSMS		DMA		LSMS		DMA
		RDT	NExT	RDT	NExT	RDT	NExT	RDT	NExT
1	2	0.0185	0.0204	0.0213	0.0286	0.0181	0.0204	0.0206	0.0286
2	1	0.0183	0.0188	0.0160	0.0197	0.0167	0.0187	0.0163	0.0196
3	3	0.0230	0.0271	0.0212	0.0209	0.0230	0.0270	0.0212	0.0210
4	4	0.0168	0.0212	0.0149	0.0210	0.0160	0.0216	0.0163	0.0214
5	6	0.0270	0.0267	0.0269	0.0267	—	—	0.0550	0.0678
7	5	0.0275	0.0274	0.0290	0.0274	0.0298	0.0282	0.0297	0.0277