B modeling
==============


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

A modal calculation is carried out using the dynamic substructuring technique.

A first calculation is carried out using a projection base of the substructure composed only of static modes. For the second calculation, a base composed of normal modes and five interface modes is used.


.. image:: images/Object_25.png
    :width: 6.339in
    :height: 2.9543in


.. _RefSchema_Object_25.png:


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

The complete structure is composed of two substructures.

The first substructure is the result of a mesh composed of 240 elements of type HEXA8.

The second substructure is obtained by translating the first substructure of :math:`-0.25m`.


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

The first five natural frequencies of the complete structure are tested.


.. csv-table::

    "**Identification**", "**Reference type**", "**Reference value**"
    ":math:`{f}_{1}` (base: static modes)", "'NON_REGRESSION'", "660.430033152 Hz"
    ":math:`{f}_{2}` (base: static modes)", "'NON_REGRESSION'", "1030.71541399 Hz"
    ":math:`{f}_{3}` (base: static modes)", "'NON_REGRESSION'", "1772.49983 Hz"
    ":math:`{f}_{4}` (base: static modes)", "'NON_REGRESSION'", "2652.54751842 Hz"
    ":math:`{f}_{5}` (base: static modes)", "'NON_REGRESSION'", "2746.67605831 Hz"
    ":math:`{f}_{1}` (base: normal modes + five interface modes)", "'SOURCE_EXTERNE'", "660.430033153 Hz"
    ":math:`{f}_{2}` (base: normal modes + five interface modes)", "'SOURCE_EXTERNE'", "1030.71541399 Hz"
    ":math:`{f}_{3}` (base: normal modes + five interface modes)", "'SOURCE_EXTERNE'", "1772.49983 Hz"
    ":math:`{f}_{4}` (base: normal modes + five interface modes)", "'SOURCE_EXTERNE'", "2652.54751842 Hz"
    ":math:`{f}_{5}` (base: normal modes + five interface modes)", "'SOURCE_EXTERNE'", "2746.67605831 Hz"