1. But

The purpose of the operator is to define:

• the basis for dynamic substructuring, when the complete structure has been divided into substructures;

• or the basis for modal recombination, when the complete structure is treated directly.

The modal base obtained by this operator is of the type: “CLASSIQUE” if the modal base is composed of dynamic eigenmodes and static deformations calculated by the operator from an interfer_dyna_clas concept produced by DEFI_INTERF_DYNA [U4.64.01]. Option DIAG_MASS allows you to recalculate a numbering for static modes so that the mass matrix is diagonal.

The base is of type RITZ in the other cases.

The operator produces a mode_meca concept.