Implemented in Code_Aster
=============================

The treatment of the base sector is identical to that of the substructures in classical substructuring. It involves the operators CALC_MODES [:external:ref:`U4.52.02 <U4.52.02>`], DEFI_INTERF_DYNA [:external:ref:`U4.64.01 <U4.64.01>`], and DEFI_BASE_MODALE [:external:ref:`U4.64.02 <U4.64.02>`].

The natural modes of the cyclic symmetric structure are calculated by the operator MODE_ITER_CYCL [:external:ref:`U4.52.05 <U4.52.05>`] as a function of the projection base of the base sector previously defined and the number of sectors of the complete structure.

The retrieval of the results on a physical basis is identical to the classical substructuring. It involves the operator REST_SOUS_STRUC [:external:ref:`U4.63.32 <U4.63.32>`] and possibly the operator DEFI_SQUELETTE [:external:ref:`U4.24.01 <U4.24.01>`].