Shell Expansion

Purpose:

To create a traditional view of the shell, rolled out along frame curves either for drawing development or as an additional view for modelling work.

Prerequisites:

A drawing must be current.

Instructions:

The user is first asked to give the name (make sure that the name is not occupied by another object), side and the limits of the shell expansion and also where to develop the shell expansion from (by default from the center line).

Then the objects to include in the shell expansion are selected. These are:

• Seams/butts

• Longitudinals

• Transversals

• Panels

• Hull curves

Options:

Default parameters used:

• NOLONGNO when given, no longitudinal names are drawn,

• SHX_LNO_DIST specifies the minimum distance between longitudinal names,

• SHX_PARTITION the distance between development curves,

• SHX_ENDCUT_SYMB when given, end cut symbols will be drawn at the ends of shell profiles,

• SHX_BUTTS_OVER_CL when given, the SB/PS part of butts over CL with the longest extension will be drawn.

Result:

A shell expansion view is produced and placed interactively. Modelling work can be performed in the shell expansion view. When an object is created/modified the shell expansion view will be updated in the same way as in any other type of view. To get the best result in the forward and aft part of the ship, the shell expansion might have to be partitioned into smaller parts in these regions.