11.4.1. The ZCGE Data Record - Z Coordinate of the Center of Gravity at Equilibrium

This data record is used to specify the Z coordinate of the center of gravity when the structure is at its free-floating equilibrium position (i.e. with no articulations and no mooring lines attached), which is used in the calculation of the linear hydrostatic forces (see The LSTF Data Record - Linear Hydrostatic Stiffness Matrix). It is also used in Aqwa-Line to indicate the structure position for the radiation/diffraction analysis.

      2   5  7   11        21
    - --- -- ---- --------- ---------
   |X|   |  |ZCGE|XXXXXXXXX|         |
    - --- -- ---- --------- ---------
       |  |   |                 |
       |  |   |                 |_(1)Z Coordinate of the Center of Gravity at Equilibrium(F10.0)
       |  |   |
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on Last data record in data category(A3)
Note:

  1. An alternative method of specifying the free-floating equilibrium position is to use the ZLWL data record in Data Category 2 (The ZLWL Data Record - Waterline Height).

  2. If the ZCGE and ZLWL data records are both absent, the definition position based on the nodes in Data Category 1 will be used.

  3. This position is not USED as the starting position for an analysis using Aqwa-Librium, Fer, Drift or Naut. This must be specified in Data Category 15 or by using the RDEP option (Administration and Calculation Options for the Aqwa Suite).