TABLE I.
Pairing between the peak frequencies in measurements and in modelling. The right hand side of the table reports the “useful” frequency ranges, as determined by the method detailed in the first column.
| Method | Frequency / kHz | |||||
|---|---|---|---|---|---|---|
| Electric impedance | 134 ± 1 | 140 | 153 ± 7 | 163 | n.a. | 174 |
| Visual aggregation | n.a.a | 142.5 ± 0.5 | n.a. | 163 ± 3 | 170 ± 1 | 174.5 ± 0.5 |
| FEM (Fig. 3) | 134 | 141.5 | n.a. | 164 | 171 | 173.5 |
| FEM (with damping) | n.a. | 141.5 | n.a. | 164 | Merged | |
| Laser vibrometer (Fig. 5) | n.a. | 163 ± 3 | 169 ± 1 | 174.5 ± 0.5 | ||
a
Not available (n.a.).