Research Article
Free Vibration Analysis of Rotating Pretwisted Functionally Graded Sandwich Blades
Table 6
Nondimensional frequency parameters for the first six modes of FG sandwich blade with varying twist angle (
, , , and
).
| Mode | 0° | 5° | 10° | 15° | 20° | 25° | 30° | 45° | 50° | 60° |
| 1st | 4.5233 | 4.5342 | 4.5342 | 4.5206 | 4.5041 | 4.4935 | 4.4743 | 4.4020 | 4.3605 | 4.3245 | 2nd | 27.9633 | 28.0799 | 27.9178 | 27.4621 | 26.8716 | 26.1715 | 25.4167 | 22.9643 | 22.1860 | 20.7649 | 3rd | 28.3106 | 28.2050 | 28.5154 | 29.1565 | 29.9955 | 31.3439 | 33.0633 | 38.0040 | 39.9970 | 44.6692 | 4th | 75.9386 | 75.7447 | 75.3807 | 74.8841 | 74.5120 | 73.8517 | 73.0937 | 70.8379 | 70.1630 | 68.9817 | 5th | 79.3035 | 79.7009 | 80.7576 | 82.0284 | 84.0329 | 86.7774 | 89.2792 | 98.6081 | 101.9785 | 107.9219 | 6th | 87.5852 | 87.9114 | 88.9680 | 90.5827 | 92.8839 | 95.9725 | 99.5237 | 112.9271 | 118.0741 | 130.0957 |
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