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Natural frequencies of reference model.
| 1st | 2nd | 3rd | 4th | ||
|---|---|---|---|---|---|
| Measured (0.06 g shaking) | Freq. (Hz) | 4.01 | 13.08 | 25.15 | 41.60 |
| Initial model | Freq. (Hz) | 3.63 | 11.92 | 22.76 | 35.89 |
| Percent error | −11% | −9% | −11% | −15% | |
| Updated model | Freq. (Hz) | 4.01 | 13.03 | 25.38 | 40.92 |
| Percent error | 0% | 0% | 1% | −1% |
