Table 12 The first eight natural frequencies (Hz) of the simply supported angle-ply [θ/-θ/θ] laminated plate-elliptical cylindrical cavity coupled system.

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

θ

Medium

Mode order

1

2

3

4

5

6

7

8

15°

In-vacuo

5.59

10.02

17.23

19.44

25.59

27.19

34.12

39.70

Air

9.64

15.27

18.46

21.71

25.00

26.69

33.43

39.38

Water

1.22

2.10

2.78

4.01

5.20

6.20

6.30

8.53

30°

In-vacuo

6.58

11.10

18.56

23.08

28.97

29.39

38.24

42.16

Air

10.62

16.08

22.06

22.50

28.35

28.70

37.47

41.73

Water

1.25

2.70

2.82

4.59

5.26

6.95

7.83

8.64

45°

In-vacuo

7.88

12.27

19.09

27.59

28.95

34.42

40.30

43.28

Air

11.68

16.33

23.09

26.76

27.95

33.67

39.83

42.45

Water

1.32

2.76

3.48

4.90

5.49

7.78

7.87

10.04

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