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

Table 12

Natural frequencies of the isosceles trapezoidal plate with curved sides under the clamped boundary condition (Hz) (C-C-C-C).

Mode	Clamped
	Present	FEM	Error (%)
1	2.55	2.54	0.50
2	4.77	4.76	0.22
3	5.58	5.56	0.36
4	7.91	7.86	0.63
5	8.16	8.17	0.15
6	10.08	10.06	0.21
7	11.70	11.69	0.05
8	12.44	12.36	0.66
9	12.58	12.59	0.08
10	15.63	15.68	0.29