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


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

:math:`\mathrm{1D}` axisymmetric shells


.. image:: images/1000061A000010A40000131F83939AB0BF20CF72.svg
    :width: 214
    :height: 246


.. _RefImage_1000061A000010A40000131F83939AB0BF20CF72.svg:

No boundary conditions.

The Love-Kirchhoff model is chosen to describe the kinematics. With the selected element, this kinematics is obtained by penalization: we put a large value for the coefficient A_ CIS. In addition, metric correction is neglected.


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

Number of knots: 81

Number of meshes and types: 40 SEG3


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

(Frequencies in hertz)


.. csv-table::

    "**Fashion ID**", "**Reference**", "**Aster**"
    **OPTION =' BANDE '**
    **(simultaneous iteration method)**", "**Aster**
    **OPTION =' AJUSTE '**
    **(inverse power method)**", "**% difference**"
    "2", "237.25", "237.31", "237.31", "237.32", "0.025/0.029"
    "3", "282.85", "282.77", "282.77", "282.78", "—0.028/—0.025"
    "4", "305.24", "304.95", "304.95", "—0.096"
    "5", "324.17", "323.68", "323.68", "—0.150"
    "6", "346.76", "346.23", "346.23", "—0.154"



notes
---------

The purpose of this test with this modeling is only to test the mass matrix. Since a satisfactory difference was observed on the first six frequencies, it was decided not to calculate the following frequencies.