fullseg

   Structure: disk segment
   Test objective: cyclic symmetry for a structure containing the
                   axis of cyclic symmetry for nodal diameter 1
   The first two eigenfrequencies of nodal diameter 0
   and the first two eigenvalues of nodal diameter 1
   correspond to rigid body modes. They are small compared to
   the other eigenfrequencies, however, their values
   highly depend on the computer system