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

Table 4

Frequency parameter of various aspect ratios having a plate thickness of h/b = 0.2.

Aspect ratio (a/b)	0.4	0.8	1	1.5	2
Present method	5.18318	2.20114	1.768	1.3164	1.15218
Ref. [1, 11]	5.1831	2.2011	1.7679	1.3164	1.1521
% error	—	—	—	—	—