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

Table 4

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

Mode	Natural frequencies (Hz)
	Lx3 = 0.2 m	Lx3 = 0.3 m	Lx3 = 0.4 m	Lx3 = 0.6 m	Lx3 = 0.8 m
1	77.969	74.750	72.187	63.692	51.435
2	78.370	76.336	75.047	73.312	71.639
3	84.681	84.688	84.658	84.563	77.943
4	88.875	87.553	86.872	86.164	84.438
5	154.72	154.52	137.34	87.783	85.788
6	157.60	156.63	153.99	145.49	112.56
7	160.95	161.22	156.09	155.41	129.74