Table 3 The natural frequencies (Hz) of FFFF [0°/90°/90°/0°] laminated square plate coupled with a rectangular cavity under different plate thicknesses and acoustic medium.

From: Isogeometric modeling and vibroacoustic analysis of a symmetrically laminated thin plate coupled with an acoustic cavity

h

Mode order

Acoustic medium

In-vacuo

Air

Water

IGA

IFSM50

IGA

IFSM50

IGA

ISFM50

1 mm

1

2.104

2.110

1.942

1.947

0.176

0.176

2

6.233

6.233

5.890

5.890

0.627

0.627

3

7.558

7.559

7.184

7.185

0.805

0.805

4

15.242

15.241

14.403

14.403

1.533

1.534

5 mm

1

10.520

10.548

10.341

10.369

1.941

1.946

2

31.162

31.157

30.794

30.789

6.873

6.873

3

37.786

37.786

37.387

37.387

8.801

8.796

4

76.204

76.130

75.286

75.212

16.806

16.779

10 mm

1

21.038

21.092

20.857

20.910

5.398

5.407

2

62.314

62.274

61.939

61.897

18.982

18.953

3

75.558

75.515

75.150

75.105

24.243

24.197

4

152.385

151.791

151.377

150.785

46.411

46.060

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