F modeling
==============


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

The characteristics of modeling F are identical to those of modeling A except for substructure 2 where the second discrete element has been replaced by the relationship :math:`F=-\mathit{kx}`. This modeling makes it possible to test the use of option RELA_EFFO_DEPL in a dynamic substructuring calculation.


.. image:: images/Shape1.gif


.. _RefSchema_Shape1.gif:

The transient response of the system is calculated using 'Craig-Bampton' interfaces (blocked interfaces). The method of integration by central differences is applied. The calculation of the direct response (without substructuring) is not included in this modeling.


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


.. csv-table::

    "**Identification**", "**Reference**"
    "Method: DIFF_CENTRE ", ""
    "Node :math:`{x}_{3}`, move (:math:`m`)", "4.17 10—1"
    "Method: DIFF_CENTRE ", ""
    "Knot :math:`{x}_{3}`, speed (:math:`{\mathrm{m.s}}^{-1}`)", "-4.3011 10—1"
    "Method: DIFF_CENTRE ", ""
    "Node :math:`{x}_{3}`, Acceleration (:math:`{\mathrm{m.s}}^{-2}`)", "3.3749 10—1"