Research Article
Free Vibration Analysis of Rotating Pretwisted Functionally Graded Sandwich Blades
Table 7
Nondimensional frequency parameters for the first six modes of the FG sandwich blade with varying thickness ratio (
, , , and
).
| Mode | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| 1st | 4.4578 | 4.4743 | 4.4745 | 4.4759 | 4.4903 | 4.5064 | 4.5022 | 4.5115 | 4.5146 | 4.5213 | 2nd | 24.2636 | 25.4167 | 25.5518 | 25.6696 | 25.7090 | 25.7337 | 25.7686 | 25.8024 | 25.8433 | 25.8342 | 3rd | 28.2468 | 33.0633 | 38.1941 | 44.8357 | 51.5288 | 59.2127 | 67.3645 | 74.2099 | 77.6186 | 77.2360 | 4th | 43.9320 | 73.0937 | 75.9033 | 76.1792 | 76.4980 | 76.7083 | 76.7618 | 76.3814 | 82.7484 | 91.1187 | 5th | 76.6391 | 89.2792 | 113.8445 | 130.9914 | 147.7835 | 151.9612 | 156.271 | 159.8808 | 159.7313 | 159.6019 | 6th | 87.7677 | 99.5237 | 126.202 | 147.8068 | 155.1631 | 169.1361 | 191.4968 | 207.7979 | 230.7914 | 250.1723 |
|
|