A Semianalytic Method for Vibration Analysis of a Sandwich FGP Doubly Curved Shell with Arbitrary Boundary Conditions

Table 4

Numerical comparison of frequencies for Sandwich FGP doubly curved structure with various boundary conditions.

Type	Mode	Elliptical shell				Hyperbolic shell
		C-C		C-F		C-C		C-F
		Present	Reference [35]	Present	Reference [35]	Present	Reference [35]	Present	Reference [35]
Type1-1	1	3.01	3.009	0.574	0.574	2.687	2.68	1.839	1.838
	2	3.012	3.011	0.738	0.738	3.025	3.013	2.218	2.217
	3	3.14	3.14	1.612	1.612	4.182	4.151	2.633	2.627
	4	3.147	3.146	2.028	2.029	4.404	4.386	2.984	2.974
Type1-2	1	3.003	3.004	0.562	0.563	2.671	2.665	1.814	1.814
	2	3.005	3.006	0.735	0.735	2.969	2.959	2.217	2.217
	3	3.129	3.129	1.581	1.582	4.087	4.058	2.613	2.607
	4	3.138	3.139	2.028	2.03	4.333	4.31	2.925	2.916