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


Geometry
---------

Excitation is a seismic movement of the imposed force type applied to point :math:`\mathrm{P4}` in the :math:`\mathrm{dx}` direction.

We are interested in the DSP of moving the :math:`\mathrm{P4}` node.


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


.. csv-table::

    "Point masses:", ":math:`m=10\mathrm{Kg}`"
    "Elastic springs:", ":math:`k={10}^{5}N/m`"
    "Shock absorbers:", ":math:`c=50N/(m/s)`"



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

The problem is one-dimensional in the :math:`x` direction (1 degree of freedom per mass).

The excitement is a DSP of constant strength of level 1, between 3 and 13 :math:`\mathrm{Hz}`.


.. image:: images/1000029400001D4000000E93A646CB3D3CEF5ABA.svg
    :width: 377
    :height: 187


.. _refImage_1000029400001d40000001d4000000e93a646 CB3D3CEF5ABA .svg: