But
===

Calculate the modes and frequencies of the following system as a function of the speeds of rotation,


.. _Ref383400607:

:math:`M\ddot{\delta }+(C+\Omega G)\dot{\delta }+K\delta =0`

Where :math:`M` is the system mass matrix, :math:`C` is a damping matrix, :math:`G` is the gyroscopic matrix (antisymmetric), and :math:`K` is the system stiffness matrix. :math:`\Omega` represents the speed of rotation.

The data required for this macro is:


1. the matrices: :math:`K,C,G` and :math:`M`


2. A list of rotation speeds

This operator returns a list of mode_meca_c:a concept for each rotation speed. It uses the CALC_MODES command.