Table 3 The first eight modal frequencies of the coupling system with rectangular 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

15.340

26.877

27.984

41.877

48.582

48.841

49.333

59.169

 ANSYS

15.338

26.872

27.978

41.879

48.569

48.828

49.319

59.13

Error (%)

0.013

0.019

0.021

− 0.005

0.027

0.027

0.028

0.066

CSCS

 Current

27.676

35.990

37.904

48.053

56.028

62.383

41.167

41.443

 ANSYS

27.665

35.974

37.885

48.048

55.998

62.340

41.18

41.438

 Error (%)

0.040

0.044

0.050

0.010

0.054

0.069

− 0.032

0.012

SFSF

 Current

10.653

13.766

15.306

24.510

24.695

40.618

41.167

41.443

 ANSYS

10.655

13.77

15.308

24.512

24.697

40.635

41.18

41.438

 Error (%)

− 0.019

− 0.029

− 0.013

− 0.008

− 0.008

− 0.042

− 0.032

0.012

CFFF

 Current

3.694

6.181

6.683

13.669

13.927

19.636

22.970

27.014

 ANSYS

3.698

6.207

6.710

13.738

13.990

19.688

23.063

27.163

 Error (%)

− 0.108

− 0.419

− 0.402

− 0.502

− 0.450

− 0.264

− 0.403

− 0.549