1. But

The role of the control is to standardize specific modes according to a criterion chosen by the user.

The modal calculation operator CALC_MODES [U4.52.02] produces a mode_meca or mode_meca_c concept whose real or complex eigenmodes are normalized in such a way that the largest of the components, which is not a multiplier of LAGRANGE, is equal to 1.

The NORM_MODE operator allows the user to choose another normalization method, for example generalized mass, generalized stiffness…

Depending on the normalization chosen, the modal parameters (participation factor, effective mass,…) are updated.

Re-entering operator.