Complex Geometry

you can create complex internal surfaces, cranking the surface in two orthogonal views.

The geometry of a deck, transverse bulkhead or longitudinal bulkhead is controlled by several Sheer points which in turn can have several Camber points attached (see Figure 3:2 below). In the context of a longitudinal bulkhead, the Sheer points determine the changes longitudinally (cranking) and the Camber points control sectional changes. In the context of a transverse bulkhead, the Sheer points determine the athwartship changes and the Camber points control profile changes.

Open the Internal Surface Editor dialog (COMPARTMENTATION \ INTERNAL SURFACES \ EDITOR...) then set the dialog’s mode to Edit and select the appropriate type (either Transverse, Longitudinal or Deck) for the internal to be edited. Now get the internal by either using;

• the GET menu item, from the pop-up menu in the list box, to select interactively or,

• simply drag the item from the Full View or Compartment View tree and drop it into the list box.

Ensure the internal is selected in the list box so that its geometry can be edited.

Next, to create a sheer curve for say for a deck for instance, select the Manual option, activating the Sheer and Camber spreadsheet grids. In the Sheer grid, select, INSERT, via the pop-up menu (activated by clicking the Right Mouse button). This will enter a new co-ordinate with initial values of 0, 0 for X and dz. Simply alter the values in the cells to those required. Continue to insert additional points to describe the required points of change. Remember that the order of the points affects the shape.

Note:
The value entered in the Position entry field is the reference location from which sheer points are measured. Thus for a deck, dz values are offsets relative to the reference Z value (for example, Position = 5, Sheer dz = 3.5 then the global value is 8.5).

After the correct sheer curve has been produced, the camber curve at the defined sheer locations can be added. In the Sheer grid, select the sheer point for which a camber curve is required. The title above the Camber grid will indicate the selected sheer point by including the X value. Now simply repeat the above method to enter a sufficient number of points to adequately describe the camber curve at each sheer location. Longitudinal bulkheads can also have their geometry modified in a similar fashion.

Note:
The camber point co-ordinates are measured relative to the parent sheer point’s co-ordinates.

Figure 3:2. An Example of a Complex Internal Surface Definition