D modeling
==============


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

Identical to modeling A with the addition of proportional viscous damping such as:

:math:`[C]=\alpha [K]+\beta [M]`

with,

:math:`\alpha =1.14110022\times {10}^{-4}` and :math:`\beta =230.4812469`

We use the Sorensen method (METHODE = 'SORENSEN') to calculate the eigenmodes.


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

Same as modeling A.


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

Non-regression tests only.