[Retracted] Free Vibration Analysis of Thick Rectangular and Elliptical Plates with Concentric Cut-Out

Table 1

The frequency parameter, , for a simply supported elliptical plate , h/b = 0.2 of various sizes, .

	0	0.1	0.2	0.3	0.4	0.5	0.6
	0.3253	0.3129	0.2959	0.2889	0.2949	0.3145	0.3399
	0.5684	0.5662	0.5524	0.5312	0.5229	0.4819	0.4272
	0.8997	0.8927	0.8539	0.6602	0.5459	0.5419	0.5966
	1.0784	1.0427	0.9019	0.8999	0.8395	0.7653	0.7087
	1.3124	1.3003	1.2652	1.2487	1.1474	1.1067	1.1334
	1.4224	1.4026	1.3512	1.2959	1.3654	1.3101	1.2237