3. Modeling A#

3.1. Characteristics of modeling#

Viscoelastic material: 3D_SI modeling.

Steel material: modeling DKT (surface elements are the lower skin of the volume elements of the viscoelastic layer).

_images/1000000000000569000002380ECADD251E1F4183.png

steel layer

(DKT)

viscoelastic layer

(3D_SI) Image 3.1-1: Structure mesh.

steel layer

(DKT)

3.2. Characteristics of the mesh#

Number of knots 186

Number of meshes 376

of which: elements SEG2 132

QUAD4 184

HEXA8 60

3.3. Tested sizes and results#

The calculation of natural modes with the option TYPE_MODE =” COMPLEXE “makes it possible to test both natural frequencies and modal damping. Only the modes of bending in the thickness of the beam are tested (mode No. 3 is a bending in the width).

Mode

Natural Frequency (Hz)

Tolerance

Damping

Tolerance

1

33.093

1.0%

0.011782

12.0%

2

211.356

1.0%

0.018138

10.0%

4

601.643

2.0%

0.018834

10.0%

Table 3.3-1 : Reference values tested.