Civil Engineering Reference
In-Depth Information
10
−
4
10
−
5
10
−
6
Test
FEM
10
−
7
4
2
0
−
2
−
4
100
300
500
700
900
1100
1300
1500
Frequency (Hz)
(a)
10
−
4
10
−
5
10
−
6
Test
FEM
10
−
7
4
2
0
−
2
−
4
100
300
500
700
900
1100
1300
1500
Frequency (Hz)
(b)
Figure 13.20
Normal displacement at the centre of: (a) the foam free surface and (b)
the PVDF surface for 100 V applied to the PVDF film (LeRoy 2008).
and Omrani
et al
. (2006) has been described in Section 12.6 for the radiation problem
(structure - cavity configuration of Figure 13.3). For the transmission loss problem, it uses
first the finite element method to calculate the mechanical impedance of the trim com-
ponents to be superimposed to the modal mechanical impedance of the panel structure.
Next, a boundary element method (BEM) is used to calculate the radiation impedance
