8. G modeling#

8.1. Characteristics of modeling#

Formulation pressure 3D elements” ACOUSTIQUE “

_images/1000000000000162000000C895179413E215C669.png

Divide =

30

meshes HEXA8selon the \(x\) axis

4

meshes HEXA8selon the \(y\) axis

4

meshes HEXA8selon the \(z\) axis

Boundary conditions:

VITE_FACE:

(group_MA: bike

Vnor: RI 0.014 0.0.)

IMPE_FACE:

(group_MA: impe

Impe: RI 445.9 0.)

Node name

\(A=\mathrm{No69}\)

\(B=\mathrm{No95}\)

\(C=\mathrm{No65}\)

\(D=\mathrm{No876}\)

8.2. Characteristics of the mesh#

Number of knots:

775

Number of meshes and types:

480 HEXA832 QUAD4

8.3. Tested values#

Location

Sizes

Reference

Tolerance

\(A\)

\(p(\mathrm{réel},\mathrm{imag})\)

Intensity_Acou

(—6.2426,0.0000) 0.0437

0.3% 3%

\(B\)

\(p(\mathrm{réel},\mathrm{imag})\)

Intensity_Acou

(—6.2426,0.0000) 0.0437

0.3% 3%

\(C\)

\(p(\mathrm{réel},\mathrm{imag})\)

Intensity_Acou

(6.0237,1.6387) 0.0437

4% 3%

\(D\)

\(p(\mathrm{réel},\mathrm{imag})\)

Intensity_Acou

(6.0237,1.6387) 0.0437

4% 3%

Frequency

Clean mode order \(i\)

\(m\)

\(n\)

\(p\)

reference

tolerance

2 3 4 5 6 7 8 9

1 »

2

3

4

5

0

1

2 »

0 0 0 0 0 0 0 0

0 0 0 0 0 1 1 1

171.5 343.0 514.5 686.0 857.5 857.5 874.482 923.556

0.1% 0.2% 0.5% 1% 2% 3% 3% 3%