Research Article
Isomap-Based Three-Dimensional Operational Modal Analysis
Table 2
Comparison of natural frequencies with different assembly methods.
| | Orders | Frequency calculated by FEA (frequency/Hz) | Orders of Isomap components | Identified by LSMS-based Isomap (frequency/Hz) | Relative error (%) | Identified by DMA-based Isomap (frequency/Hz) | Relative error (%) |
| | 1 | 1054.9 | 2 | 1059 | 0.387 | 1059 | 0.387 | | 2 | 1145.7 | 1 | 1145 | −0.061 | 1149 | 0.288 | | 3 | 1239.6 | 3 | 1237 | −0.210 | 1237 | −0.210 | | 4 | 1441.9 | 4 | 1441 | −0.062 | 1441 | −0.062 | | 5 | 1740.0 | 6 | — | — | — | — | | 7 | 1871.7 | 5 | 1874 | 0.123 | 1874 | 0.123 |
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