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


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


.. image:: images/Object_7.svg
    :width: 574
    :height: 267


.. _RefImage_Object_7.svg:

To validate the modeling in a coordinate system different from the global coordinate system, the plate is rotated by :math:`\mathrm{15,5}°`. This should not change the natural frequencies obtained.


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

Number of knots: 122

Number of meshes and types: 200 TRIA3


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


.. csv-table::

    "**Identification**", "**Instants**", "**Reference**", "**Aster**", "**% difference**"
    "Frequency
    (mode 4 out of plane)", "", "44.762", "47.358", "5.799"
    "Frequency
    (modes 5 & 6 off plan)", "", "110.52", "118.029
    118.059", "6.795
    6.822"
    "Frequency
    (mode 7 out of plane)", "", "169.08", "187.504", "10.897"
    "Frequency
    (Mode 8 in the map)", "", "193.93", "196.089", "1.114"
    "Frequency
    (mode 9 & 10 in the map)", "", "206.64", "211.658
    212.000", "2.428
    2.594"



notes
----------


*In Aster, the calculated modes are those of rigid bodies: the fourth reference mode is the first mode calculated by the*Code_Aster*.


*Appearance of two flexure modes after reference mode 11 (mode 8 of*Code_Aster*), in the same form as those appeared in modeling DST between reference modes 8 and 9 (modes 6 and 7 of*Code_Aster*).

In the table below we have reported the first 14 natural frequencies found.


.. csv-table::

    "Mode No.", "Frequency (Hz)"
    "1", "47.358"
    "2", "118.03"
    "3", "118.06"
    "4", "187.50"
    "5", "196.09"
    "6", "211.66"
    "7", "212.00"
    "8", "22.53"
    "9", "235.41"
    "10", "235.56"
    "11", "264.73"
    "12", "289.85"
    "13", "302.84"
    "14", "303.15"