Free Vibration of Rectangular Plates with Porosity Distributions under Complex Boundary Constraints

Table 7

Nondimensional frequency parameter Ω of porous rectangular plates with different aspect ratios (CCCC) (e = 0.2 and h/b = 0.2).

Type	Mode no.	Aspect ratio a/b
		0.5	1.0	1.5	2.0	2.5	3.0	3.5
I	1	0.6238	0.3112	0.2455	0.2258	0.2181	0.2144	0.2124
	2	0.7756	0.5429	0.3558	0.2841	0.2522	0.2362	0.2274
	3	0.9708	0.5429	0.5002	0.3811	0.3130	0.2763	0.2551
	4	1.0097	0.7207	0.5186	0.4855	0.3971	0.3346	0.2967
	5	1.1906	0.7207	0.5559	0.4867	0.4493	0.4081	0.3511
II	1	0.6292	0.3160	0.2496	0.2296	0.2218	0.2180	0.2160
	2	0.7823	0.5493	0.3612	0.2887	0.2564	0.2402	0.2312
	3	0.9709	0.5493	0.5063	0.3869	0.3181	0.2809	0.2594
	4	1.0178	0.7208	0.5254	0.4855	0.4032	0.3400	0.3016
	5	1.1977	0.7208	0.5559	0.4926	0.4493	0.4144	0.3568
III	1	0.6220	0.3101	0.2446	0.2249	0.2172	0.2136	0.2115
	2	0.7735	0.5412	0.3545	0.2830	0.2512	0.2353	0.2265
	3	0.9695	0.5412	0.4986	0.3796	0.3118	0.2752	0.2541
	4	1.0071	0.7197	0.5169	0.4848	0.3956	0.3333	0.2955
	5	1.1882	0.7197	0.5551	0.4851	0.4487	0.4066	0.3498