Reference problem
=====================


Geometry
---------

The system studied is composed of 3 masses (:math:`m`) and 4 springs (:math:`k`). The set is embedded at its ends.


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    :height: 159


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Material properties
-----------------------

Spring stiffness: :math:`k=\mathrm{1 }N/m`.

Point masses: :math:`m=\mathrm{1 }\mathrm{kg}`.


Boundary conditions and loads
-------------------------------------


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    :width: 420
    :height: 159


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Points :math:`A` and :math:`B` embedded.

Application to point :math:`\mathrm{x1}` of a constant force :math:`F=\mathrm{1 }N`, starting from instant :math:`t=\mathrm{0 }s`.


Initial conditions
--------------------

Structure initially at rest.