Here are the nominal parameters of the disk with flats
| Parameter |
Value |
| Diameter (nominal) |
75.0 mm |
| Thickness (nominal) |
1.00 mm |
Distance of flats from center of disk
(as measured by MO) |
36.05 mm |
| Young's modulus (from G1601850) |
72.3 GPa |
| Poisson's ratio (from G1601850) |
0.164 |
| Density |
2202 kg/m^3 |
A COMSOL simulation gives the frequencies and mode shapes shown in the attached PDF file. Following the list of frequencies and a classification of the mode family (numer of radial nodes, number of azimuthal nodes in a half turn):
| Frequency [Hz] |
Radial |
Azimuthal |
| 1089.7 |
0 |
2 |
| 1109.1 |
0 |
2 |
| 1661.1 |
1 |
0 |
| 2501.3 |
0 |
3 |
| 2542.3 |
0 |
3 |
| 3837.7 |
1 |
1 |
| 3909.8 |
1 |
1 |
| 4359.9 |
0 |
4 |
| 4421.2 |
0 |
4 |
| 6656 |
0 |
5 |
| 6665.3 |
1 |
2 |
| 6732.7 |
0 |
5 |
| 6780 |
1 |
2 |
| 7283.9 |
2 |
0 |
| 9381.5 |
0 |
6 |
| 9470.6 |
0 |
6 |
| 10054.1 |
1 |
3 |
| 10210.2 |
1 |
3 |
| 11244.2 |
2 |
1 |
| 11414.2 |
2 |
1 |
| 12528.4 |
0 |
7 |
| 12655.4 |
0 |
7 |
| 13970.1 |
1 |
4 |
| 14148.9 |
1 |
4 |
| 15854.8 |
2 |
2 |
| 15856.8 |
2 |
2 |
| 16101.1 |
0 |
8 |
| 16227.8 |
3 |
0 |
| 16853.9 |
3 |
0 |
| 18387.2 |
1 |
5 |
| 18562.6 |
1 |
5 |
| 19984.9 |
0 |
9 |
| 20045.8 |
0 |
9 |
| 21067.2 |
2 |
3 |
| 21358.1 |
2 |
3 |
| 22300.9 |
3 |
1 |
| 22848.8 |
3 |
1 |
| 23270.5 |
1 |
6 |
| 23419.4 |
1 |
6 |
| 24374.1 |
0 |
10 |
| 24425.2 |
0 |
10 |
| 26793.8 |
2 |
4 |
| 27083.9 |
2 |
4 |
| 28533.5 |
1 |
7 |
| 28637.8 |
1 |
7 |
| 28692 |
3 |
2 |
| 28998.5 |
4 |
0 |
| 29228.3 |
0 |
11 |
| 29271.9 |
0 |
11 |
| 29870.1 |
4 |
0 |
| 33040 |
2 |
5 |
| 33301.4 |
2 |
5 |
| 33949.1 |
0 |
12 |
| 33986.5 |
0 |
12 |
|