6. Examples for real trends

For modes_meca modes (real eigenmodes) resulting from a resolution of a generalized problem with eigenvalues \((K-\lambda M)x=0\):

• normalizing an eigenvector \(x\) to unit generalized stiffness is equivalent to \(x\) satisfying

\({x}^{T}Kx=1\)

Normalization with duplication of the conceptmode_meca:

NORME = “RIGI_GENE” );

• normalizing an eigenvector \(x\) to the generalized unit mass is equivalent to \(x\) satisfying

\({x}^{T}Mx=1\)

Normalization to the generalized unit mass, with the overriding of the mode_meca concept:

MODE = me, NORME = “MASS_GENE” );