Analysis of the Vibro-Acoustic Behavior of a Stiffened Double Panel-Cavity System

Table 3

First seven natural frequencies of the stiffened double panel-cavity coupled system with the different thickness of the stiffener.

Mode	Natural frequencies (Hz)
	h3 = 0.001 m	h3 = 0.002 m	h3 = 0.004 m	h3 = 0.006 m	h3 = 0.008 m
1	28.956	34.529	51.435	66.297	77.855
2	32.128	57.074	71.640	78.322	83.472
3	32.382	65.343	77.945	84.449	84.454
4	47.504	70.485	84.440	85.798	85.801
5	54.079	70.618	85.790	89.355	101.10
6	66.829	84.411	112.56	150.29	161.50
7	68.532	85.770	129.74	159.13	161.55