Modeling A
==============


Characteristics of modeling
-----------------------------------

Model A is modelled using elements DIS_T


Characteristics of the mesh
----------------------------

Number of knots: 2

Number of meshes: 3 DIS_T to model the mass (M_T_D_N), the stiffness (K_T_D_L) and the shock absorber (A_T_D_L)


Results
---------

The vertical response spectrum obtained using the macro-command CALC_SPECTRE_IPM from the vertical acceleration of the node N 02 is compared to that obtained using the model B. We are in a case with relative coordinate resolution (single-press loading).

A check of the pseudo_acceleration values is performed for several acceleration values.


.. image:: images/10000201000002BD000002228E99DDFCE10047AB.png
    :width: 4.0043in
    :height: 3.4783in


.. _RefImage_10000201000002BD000002228E99DDFCE10047AB.png:


.. csv-table::

    "**Node**", "**Frequency**", "**Reference**", "**Reference Type**", "**Tolerance**"
    "N02", "5", "0.425896", "'AUTRE_ASTER'", "3%"
    "N02", "10", "1.44050", "'AUTRE_ASTER'", "3%"
    "N02", "15", "1.93754", "'AUTRE_ASTER'", "0.1%"
    "N02", "20", "3.39816", "'AUTRE_ASTER'", "0, 5%"
    "N02", "25", "1.46011", "'AUTRE_ASTER'", "1%"
    "N02", "30", "1.08058", "'AUTRE_ASTER'", "1.1%"
    "N02", "35", "1.00117", "'AUTRE_ASTER'", "0, 9%"
    "N02", "40", "0.929183", "'AUTRE_ASTER'", "0, 3%"
    "N02", "45", "0.871687", "'AUTRE_ASTER'", "1%"
    "N02", "50", "0.833936", "'AUTRE_ASTER'", "1, 9%"


The treatment of the case is also validated in absolute reference, by comparison with the result in relation to a zero training signal.

Finally, we validate the initial correction (CORR_INIT =' OUI ') for which a non-zero initial acceleration is required. To do this, we will shift the training signal slightly in time: :math:`f(t)=\mathrm{sin}(2\mathrm{\pi }20.(t+0.00001))`. The answer obtained will therefore remain very close to the initial calculation without this delay.