Research Article
Isomap-Based Three-Dimensional Operational Modal Analysis
Table 15
PCA and Isomap by LSMS with a real modal damping ratio of 0.05.
| Real order | Identified order | LSMS | PCA (MDS) | Isomap | MAC | Frequencies | Relative error (%) | MAC | Frequencies | Relative error (%) |
| 1 | 2 | 0.6311 | 1059 | 0.389 | 0.6316 | 1065 | 0.957 | 2 | 1 | 0.3026 | 1143 | −0.236 | 0.3019 | 1143 | −0.236 | 3 | 3 | 0.1082 | 1232 | −0.613 | 0.1088 | 1229 | −0.855 | 4 | 4 | 0.0801 | 1437 | −0.340 | 0.0788 | 1441 | −0.062 | 5 | 6 | 0.0037 | 1747 | 0.402 | 0.0227 | — | — | 7 | 5 | 0.0219 | 1868 | −0.198 | 0.0211 | 1879 | 0.390 |
|
|