Research Article
Free Vibration Analysis of Rings via Wave Approach
Table 3
Comparison of free vibration by FEM for four type boundaries.
| Different boundaries | 1st mode | 2nd mode | 3rd mode | 4th mode | 5th mode |
| Inner free, outer free | 143.40 Hz | 334.10 Hz | 569.55 Hz | 1336.50 Hz | 1845.16 Hz | Inner fixed, outer free | 37.76 Hz | 168.30 Hz | 415.19 Hz | 1247.90 Hz | 1448.10 Hz | Inner free, outer fixed | 70.44 Hz | 321.96 Hz | 572.94 Hz | 1388.86 Hz | 1848.67 Hz | Inner fixed, outer fixed | 101.07 Hz | 413.28 Hz | 1272.37 Hz | 1479.74 Hz | 2927.38 Hz |
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