Free Vibration Analysis of Arbitrary-Shaped Plates Based on the Improved Rayleigh–Ritz Method

Table 11

Natural frequencies of the elliptical thin plate under the clamped boundary condition (Hz).

Mode	Clamped
	Present	FEM	Error (%)
1	34.123	34.153	0.08
2	49.200	49.292	0.18
3	69.721	69.893	0.24
4	87.090	87.359	0.30
5	95.895	96.228	0.34
6	109.697	110.09	0.35
7	127.815	128.47	0.51
8	136.944	137.5	0.40
9	164.982	166.37	0.83
10	165.533	166.64	0.66