Vessel - Profile Options & Reference Point
If you want to define a vessel profile, three options are provided on the Profile Options drop-down list shown in the figure below, namely Standard Vessel Profile, TLP Vessel Profile and User Vessel Profile. If you choose any of these options, the Properties button to the right of the drop-down list becomes enabled. The User Specified Profile button is also enabled if you select a User Vessel Profile.
If you choose the Standard Vessel Profile option, an outline of a generic vessel is generated. The Properties option in this case is used to define mandatory inputs of Length and Depth of Keel below Origin, which are self-explanatory. A third input called Horizontal Offset from Origin allows you to optionally offset the midpoint of the vessel profile away from the vessel origin in the vessel’s local-Y direction. This is useful if the vessel origin is not located at its midpoint.
If you choose TLP Vessel Profile, an outline of a generic TLP is generated. The mandatory Properties inputs in this case are Height, Depth of Keel below Origin, Length and Width, which are again self-explanatory. Similar to the standard vessel, you may optionally offset the midpoint of the vessel profile away from the vessel origin – this time in the horizontal plane. This is facilitated by the optional Y Offset from Origin and Z Offset from Origin inputs which are all in local vessel co-ordinates.
The final User Vessel Profile option allows you to define an arbitrary vessel profile. In this case, you use the User Specified Profile dialog to select an ASCII data file containing the vessel profile. This is identified via a standard Windows Open dialog, which allows you to browse for the file on your computer or local network. In the actual ASCII file itself, the vessel profile is input as a series of point locations and connections. Similar to the other vessel profiles, you may optionally offset the arbitrary vessel profile away from the vessel origin – this time in all directions. This is facilitated by optional X Offset from Origin, Y Offset from Origin and Z Offset from Origin inputs on the Properties dialog, which again are in local vessel co-ordinates.
All vessel profile types have an option for creating solid profiles of the vessel in the animation files generated by an analysis. Such solid profiles may prove more visually pleasing than a basic wire frame representation and to request them you should set the Create Solid Profile drop-down list to Yes on the Properties dialog.
To specify a reference point on the vessel that is different to the vessel origin, click on the Reference Point button. Enter the X Coordinate, Y Coordinate, and Z Coordinate values for the reference point, relative to the vessel origin. You define vessel motions and RAOs relative to the vessel reference point.