Research Article
Free Vibration Analysis of Rotating Pretwisted Functionally Graded Sandwich Blades
Table 9
Nondimensional frequency parameters for the first six modes of the FG sandwich blade with varying layer thickness ratios (
, , , and
).
| Mode | 1/4 | 1/3 | 1/2 | 1/1 | 2/1 | 3/1 | 4/1 |
| 1st | 4.2021 | 4.3068 | 4.4743 | 4.7574 | 4.9764 | 5.0854 | 5.1378 | 2nd | 23.6280 | 24.3536 | 25.4167 | 27.0889 | 28.3771 | 28.9429 | 29.2352 | 3rd | 30.4576 | 31.3180 | 33.0633 | 35.0677 | 36.7356 | 37.6719 | 38.4396 | 4th | 68.0698 | 70.1619 | 73.0937 | 78.1350 | 81.7252 | 83.5669 | 84.7660 | 5th | 83.1451 | 85.6584 | 89.2792 | 95.5154 | 100.6206 | 103.1477 | 104.3400 | 6th | 92.4498 | 95.1984 | 99.5237 | 106.5238 | 111.4889 | 114.2924 | 116.4530 |
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