Research Article
Numerical Investigation on Suppressing High Frequency Self-Excited Noises of Armature Assembly in a Torque Motor Using Ferrofluid
Table 2
The results of modal analysis of armature assembly with and without ferrofluid.
| | (N/m) | 1st order (Hz) | 4th order (Hz) | 6th order (Hz) | 8th order (Hz) | 9th order (Hz) | Other orders |
| | 0 | 590.6 | 1127.9 | 2595.4 | 3705.4 | 3734.6 | | | 21.95 | 591.2 | 1128.1 | 2594.4 | 3708.3 | 3735.4 | Unchanged | | 36.47 | 591.8 | 1128.2 | 2594.5 | 3708.5 | 3735.4 | Unchanged | | 86.72 | 593.7 | 1128.4 | 2594.6 | 3709.3 | 3737.6 | Unchanged | | 339.51 | 603.1 | 1129.7 | 2595.1 | 3713.2 | 3736.7 | Unchanged |
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