I simulated the resonant mode of OMC stack with Autodesk Fusion. I used drawings shown in the slides here as a reference of the CAD design. Young modulus of the rubber are estimated from the measured value reported in klog 29651 as 15 MPa. Poisson ratio is assumed to be 0.5, which is a typical values for rubbers. With these values, shear moduls is calculated by 5 MPa. In this simulation no extra load is added.
Here I summarized the resonant frequency and the corresponding mode in the list below:
| No. | Frequency | Shape |
| 1 | 4.718 | Common X |
| 2 | 4.721 | Common Y |
| 3 | 4.891 | Common Yaw |
| 4 | 14.022 | (Bottom, Mid)-Top Differential X |
| 5 | 14.025 | (Bottom, Mid)-Top Differential Y |
| 6 | 14.142 | (Bottom, Mid)-Top Differential Yaw |
| 7 | 20.658 | (Bottom, Top)-Mid Differential Yaw |
| 8 | 21.503 | (Bottom, Top)-Mid Differential X |
| 9 | 21.504 | (Bottom, Top)-Mid Differential Y |
| 10 | 38.875 | Common Pitch |
| 11 | 38.999 | Common Roll |
| 12 | 40.128 | Common Z |
| 13 | 97.361 | (Bottom, Mid)-Top Differential Pitch |
| 14 | 97.761 | (Bottom, Mid)-Top Differential Roll |
Attached figures show the shape of each resonant mode. The color ndicates the displacement along x axis.
