The Modeling Method for Vibration Characteristics Analysis of Composite-Laminated Rotationally Stiffened Plate

Table 4

Frequency parameter Ω of stiffened composite circular sector plate under different boundary and parameter conditions.

Boundary condition	Angle-ply	ϑ	Modal order
			1	2	3	4	5	6	7	8
SSF	[0°/90°]	90°	5.797	8.852	13.234	17.199	18.315	19.821	21.831	22.419
		180°	5.363	6.351	7.923	9.725	9.888	12.097	12.612	14.491
		270°	5.092	5.781	6.572	6.915	7.630	8.873	9.255	10.250
	[90°/0°/90°]	90°	4.619	8.080	12.924	13.823	18.832	18.898	19.251	19.916
		180°	4.161	5.294	7.066	9.224	9.469	11.680	12.183	13.681
		270°	4.023	4.628	5.557	6.580	6.744	8.113	8.668	9.628
CCF	[0°/90°]	90°	8.207	11.190	15.607	18.583	20.855	22.816	23.771	26.580
		180°	7.634	8.732	10.026	10.209	12.106	12.698	14.291	16.709
		270°	6.260	8.199	8.282	8.935	9.300	9.919	11.098	12.436
	[90°/0°/90°]	90°	6.536	10.139	15.326	16.746	19.513	21.686	22.733	23.480
		180°	6.032	7.157	8.927	9.660	11.140	12.303	13.704	16.560
		270°	5.633	6.505	6.961	7.392	8.574	8.695	9.955	11.511
CCC	[0°/90°]	90°	9.601	13.684	18.862	23.991	24.864	30.352	31.681	37.238
		180°	8.234	9.531	11.272	13.558	15.804	18.717	21.293	22.849
		270°	7.912	8.573	9.471	10.608	11.907	12.856	13.393	14.946
	[90°/0°/90°]	90°	8.337	13.307	19.553	19.834	27.063	27.566	34.966	36.190
		180°	6.549	8.111	10.226	12.775	15.615	16.757	18.889	19.482
		270°	6.196	6.957	8.042	9.393	10.911	12.562	12.661	14.496
	[0°/90°]	90°	1.041	3.963	4.724	5.332	6.067	7.035	7.982	9.027
		180°	0.785	3.826	4.030	4.472	5.062	5.310	5.813	6.732
		270°	0.669	3.788	3.855	4.088	4.385	4.757	5.200	5.300
	[90°/0°/90°]	90°	1.026	3.563	4.147	4.610	6.208	7.162	7.765	8.587
		180°	0.771	3.393	3.730	4.112	4.316	5.048	5.982	6.920
		270°	0.653	3.344	3.493	3.818	4.102	4.212	4.680	5.235