3. Modeling A#

3.1. Characteristics of modeling#

Elements MECA_HEXA8, MEFL_HEXA8, MEFS_QUAD4

_images/100034CE000023DD0000115DD199CA437B799284.svg

Boundary conditions:

In all the knots on the face \(M\)

In all the piston nodes

3.2. Characteristics of the mesh#

Number of knots:

63

Number of meshes and types:

24 HEXA8, 8 QUAD4

3.3. Tested values#

In modal calculation (CALC_MODES)

Frequency

( \(\mathit{Hz}\) )

Reference

ANALYTIQUE

Error (%)

13.8285

13.8277

< 0.01

By MODE_VIBR in DYNA_NON_LINE

Frequency

( \(\mathit{Hz}\) )

Reference

ANALYTIQUE

Error (%)

13.8285

13.8277

< 0.01

3.4. notes#

Mode calculations performed by:

CALC_MODES

OPTION =” AJUSTE “, CALC_FREQ =_F (FREQ =( 10.,20.))

The analytical solution of the first eigenvector is not known.

Contents of the results file:

Value of the first natural vibration frequency of the coupled system.