Hull Reference

The hull reference object is a small table containing information about names and name rules of objects in the form data bank. The AVEVA Marine modules access the name of this object via the environment variable SB_HREF.

The hull reference object is created or modified by a feature of hull utility inithull.

The object contains the following information:

• Some characteristic dimensions of the ship (length between perpendiculars, half-breadth, )

• The name and suffix of the main hull surface. See below for an explanation of the suffix and plate option concepts.

• The name and suffix of the deck surface. See below for an explanation of the suffix and plate option concepts.

• The group names of frame, waterlines and buttocks.

  The names main curves of these types are composed by a ‘group name’ concatenated with a curve number (for example, a frame number). These group names are defined in this object.

• Co-ordinate tables for frame, waterline and buttock curves.

  These tables contain the x-, z- and y-co-ordinate, respectively, of the plane in which the curve with a given number is located.

• Group names of seams/butts.

• The names of limit tables along the x and z-axes for seams.

  One of these tables contain the minimum and maximum co-ordinates along the x-axis of all seams, the other the same information for the z-axis.

• Flag to control if free naming of seams and shell profiles is allowed in the project.

It is possible to define additional sculptured surfaces for which the names have to be defined as well in the hull reference object. Curves created in these additional surfaces are named according to the same rules as curves in the main surfaces. To separate them from the main surface curves the group names of these additional surfaces have an additional ‘suffix’ by which the group name extended. These suffixes, as well as plate options, are specified together with the additional surfaces for which they are valid.

For each surface (main, deck and additional) an option is set to control whether plate thickness should be regarded for shell profiles and planar panels. The four alternatives available defines (per surface) whether shell profile traces and plane panel boundaries (individual settings for each of the two) will be adjusted according to thickness of shell plates.

It is good rule (but not compulsory) to let all names start with the ship letters.