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

Table 8

First four frequencies for Type 2-1 Sandwich FGP doubly curved structure with diverse boundary conditions.

Type	Mode	Parabolic shell			Hyperbolic shell			Elliptical shell
		CC	SS	CF	CC	SS	CF	CC	SS	CF
Case 1	1	64.94	62.44	15.01	107.20	104.70	42.79	354.72	273.62	69.75
	2	67.03	64.52	17.74	110.00	106.64	47.47	383.30	313.01	126.40
	3	70.23	67.79	23.95	134.10	128.93	56.30	456.33	406.35	145.66
	4	78.04	75.83	26.29	135.71	133.17	74.93	546.42	513.89	218.24
Case 2	1	116.71	109.14	22.92	99.86	97.95	40.55	248.11	219.33	45.56
	2	118.70	110.50	25.56	108.03	104.53	42.31	248.57	248.07	60.59
	3	120.66	114.08	29.62	121.11	119.30	55.79	257.72	248.33	128.40
	4	131.52	126.25	40.85	134.06	128.50	64.85	259.37	257.72	167.75
Case 3	1	159.78	142.49	28.23	96.39	94.80	38.96	135.12	134.99	35.26
	2	160.05	143.63	31.25	106.05	102.53	39.72	138.25	138.01	41.87
	3	163.93	146.16	34.37	108.83	107.57	55.60	151.02	150.98	111.92
	4	164.60	149.66	45.07	114.48	111.54	57.71	158.70	158.51	118.26