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

Table 8

Natural frequencies of free vibration on the triangular plate under the boundary condition of three-side simply supported (Hz).

Mode	Simply supported
	Present	FEM	Error (%)
1	122.93	122.37	0.4576
2	245.85	244.79	0.4344
3	319.61	318.00	0.5079
4	417.94	416.25	0.4072
5	491.69	489.74	0.3997
6	614.69	610.59	0.6723
7	639.18	637.05	0.3358
8	713.41	710.93	0.3489
9	836.13	832.47	0.4398
10	910.22	906.65	0.3938