1. But

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

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

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

The data required for this macro is:

1. the matrices: \(K,C,G\) and \(M\)

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.