Research Article
Free Vibration of Rectangular Plates with Porosity Distributions under Complex Boundary Constraints
Table 8
Nondimensional frequency parameter Ω for porous rectangular plates with different thickness ratios h/b (e = 0.2 and a/b = 0.5).
| Type | Mode no. | Thickness ratio | 0.02 | 0.04 | 0.06 | 0.08 | 0.1 | 0.15 | 0.2 |
| I | 1 | 0.0114 | 0.0440 | 0.0936 | 0.1556 | 0.2258 | 0.4200 | 0.6238 | 2 | 0.0147 | 0.0564 | 0.1192 | 0.1968 | 0.2841 | 0.5241 | 0.7756 | 3 | 0.0207 | 0.0783 | 0.1634 | 0.2666 | 0.3811 | 0.6900 | 0.9708 | 4 | 0.0291 | 0.1085 | 0.2203 | 0.3494 | 0.4855 | 0.7282 | 1.0097 | 5 | 0.0293 | 0.1087 | 0.2232 | 0.3588 | 0.4867 | 0.8393 | 1.1906 |
| II | 1 | 0.0117 | 0.0450 | 0.0956 | 0.1586 | 0.2296 | 0.4250 | 0.6292 | 2 | 0.0151 | 0.0578 | 0.1217 | 0.2005 | 0.2887 | 0.5303 | 0.7823 | 3 | 0.0212 | 0.0801 | 0.1667 | 0.2714 | 0.3869 | 0.6975 | 0.9709 | 4 | 0.0298 | 0.1109 | 0.2243 | 0.3546 | 0.4855 | 0.7282 | 1.0178 | 5 | 0.0300 | 0.1111 | 0.2275 | 0.3647 | 0.4926 | 0.8459 | 1.1977 |
| III | 1 | 0.0113 | 0.0437 | 0.0932 | 0.1549 | 0.2249 | 0.4186 | 0.6220 | 2 | 0.0147 | 0.0561 | 0.1186 | 0.1959 | 0.2830 | 0.5225 | 0.7735 | 3 | 0.0206 | 0.0779 | 0.1626 | 0.2655 | 0.3796 | 0.6879 | 0.9695 | 4 | 0.0289 | 0.1080 | 0.2194 | 0.3482 | 0.4848 | 0.7272 | 1.0071 | 5 | 0.0291 | 0.1082 | 0.2223 | 0.3574 | 0.4851 | 0.8372 | 1.1882 |
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