Table 4 The first eight modal frequencies of the coupling system with elliptical panels.

From: An isogeometric modeling and vibro-acoustic characteristics analysis of a double panel-acoustic cavity coupling system with in-plane functionally graded materials

Boundary

Frequency (Hz)

1

2

3

4

5

6

7

8

SSSS

Current

26.825

40.365

42.853

45.716

65.160

66.633

66.757

68.253

ANSYS

26.839

40.325

42.792

45.674

65.027

66.783

66.905

68.157

Error (%)

− 0.052

0.099

0.143

0.092

0.205

− 0.225

− 0.221

0.141

CCCC

Current

12.970

25.449

26.488

39.053

44.030

44.139

46.104

52.856

ANSYS

13.163

25.814

27.099

39.362

44.067

44.175

46.723

53.539

Error (%)

− 1.466

− 1.414

− 2.255

− 0.785

− 0.084

− 0.081

− 1.325

− 1.276