Isomap-Based Three-Dimensional Operational Modal Analysis

Table 12

RDT and NExT results with a real modal damping ratio of 0.05.

Real order	Identified order	Real modal ratio = 0.05
		PCA (MDS)				Isomap
		LSMS		DMA		LSMS		DMA
		RDT	NExT	RDT	NExT	RDT	NExT	RDT	NExT
1	2	0.0312	0.0331	0.0312	0.0454	0.0297	0.0331	0.0373	0.0442
2	1	0.0716	0.0854	0.0585	0.0679	0.0825	0.0861	0.0549	0.0673
3	3	0.0388	0.0410	0.0543	0.0611	0.0391	0.0410	0.0524	0.0597
4	4	0.0274	0.0367	0.0625	0.0780	0.0298	0.0368	0.0619	0.0821
5	6	0.0434	0.0450	0.0361	0.0450	—	—	0.0364	0.0471
7	5	0.0492	0.0485	0.0393	0.0453	0.0499	0.0496	0.0416	0.0462