C modeling
==============


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

Item DKT with distorted mesh


.. image:: images/10000DE400001389000012EA6A84C4D25673A486.svg
    :width: 252
    :height: 244


.. _RefImage_10000DE400001389000012EA6A84C4D25673A486.svg:

Element slenderness: between 50 and 75.

**Boundary conditions:**

in all :math:`P` nodes on the :math:`\mathrm{Xp}=0.` side:

DDL_IMPO: (GROUP_NO: COTE DX:0., DY:0., DZ: 0., DRY: 0.)


.. csv-table::

    "**Node name:**", "Point :math:`1` = :math:`\mathrm{N1}`"
    "", "Point :math:`\mathrm{25 }` = :math:`\mathrm{N25}`"



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


.. csv-table::

    "Number of knots:", "25"
    "Number of meshes and types:", "32 TRIA3"



Tested sizes and results
------------------------------

**Frequency (** :math:`\mathrm{Hz}` **)**


.. csv-table::

    "**Clean mode order**", "**Reference**", "**Test NAFEMS**", "**Aster**", "**% difference**"
    "", "NAFEMS ", "", "", ""
    "1", "0.421", "0.4174", "0.4163", "—1.12"
    "2", "1.029", "1.020", "1.020", "1.0340", "0.49"
    "3", "2.582", "2.571", "2.571", "2.5644", "—0.68"
    "4", "3.306", "3.317", "3.317", "3.2539", "—1.58"
    "5", "3.753", "3.780", "3.7433", "—0.26"
    "6", "6.555", "6.883", "6.4898", "—0.99"
    "", "Test 0", "", "", ""
    "7", "7.3756", "", "7.2119", "—2.22"
    "8", "7.7332", "", "7.6026", "—1.69"
    "9", "8.5567", "", "8.3232", "—2.73"
    "10", "11.1199", "", "10.7735", "—3.12"
    "11", "11.6474", "", "11.2607", "—3.32"
    "12", "14.3531", "", "13.3008", "—7.34"



notes
---------

Calculations made by:


.. code-block:: text
 CALC_MODES
OPTION = 'PLUS_PETITE'
CALC_FREQ =_F (NMAX_FREQ = 12)
SOLVEUR_MODAL =_F (METHODE = 'TRI_DIAG')


Contents of the results file
----------------------------

12 first natural frequencies, eigenvectors and modal parameters.