CYAX

Bulk Data Entry Used to list the grids that lie on the axis of symmetry, in cyclic symmetry analysis.

Format 1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CYAX GID1 GID2 GID3 GID4 GID5 GID6 GID7 GID8
GID9 GID10 etc.

Format 2

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CYAX GID1 GID2 GID3 THRU GID5 GID6 GID7 GID8
GID9 GID10 etc.

Example 1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CYAX 101 27 50 51 52 53 54 55
122

Example 2

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CYAX 102 27 50 THRU 55 122

Definitions

Field Contents SI Unit Example
GIDi Unique grid point identification number.

No default (Integer > 0)

Comments

  1. Grid points on the axis of symmetry should not be defined on the CYJOIN entry.
  2. The displacement coordinate system (CD field on the GRID entry) for a grid on CYAX must be rectangular. The Z-axis in this coordinate system must coincide with the axis of symmetry for the model.
  3. Grid points on CYAX may be constrained by SPCs, but not by MPCs. If all components are constrained by SPC, the grid point will be internally ignored from the CYAX list.
  4. When 3 or more cyclic symmetric segments (defined by NSEG field on the CYSYM entry) are involved, then any SPC to be applied to the grids on CYAX should satisfy the following rule:
    • Both components 1 and 2 should be constrained, otherwise neither of them should be constrained. The same rule applies to components 4 and 5.
    • There is no restriction to components 3 and 6.
  5. By default, the axis of symmetry is defined by the first grid pair on the CYJOIN entry, while the CYAX entry does not define the axis of symmetry for cyclic symmetry analysis. Adding PARAM, AXCYSYM, YES allows the axis of symmetry to be defined according to the grids listed on the CYAX entry, instead of using the grids from the CYJOIN entry, and the rules described in Comment 2 still apply.