USER'S GUIDE - ShipWeight

Additional features
Similar formulas are used for Roll/Yaw and Roll/Pitch calculations.
If ‘Include 2.term of Steiner theorem’ is selected, the following rules will apply
when calculating moment of inertia:
If a weight item is defined with extension in all 3 dimensions, self-inertia will be
calculated for that item and included in the total moment of inertia
If a weight item is defined without extension in all 3 dimensions, self-inertia will
be neglected for that item.
When calculating the self-inertia, the shape of the weight item will be
approximated to a box
The gyration dialog buttons “Item filter” and “Wgt.Grp. filter” enables the
calculation of gyration for parts of the vessel defined by the filter
specifications. Clicking these buttons will pop up the standard filter dialogs as
used in Item dialog and Weight Distribution dialog.
The Gyration dialog will list gyration contribution from each single weight item
in the details list of the lower part of the dialog. The canned print report from
this dialog also has the option of whether or not to include the item details in
the report.
The gyration dialog gives the opportunity to include self-inertia defined in
custom codes by checking the Predef.Val. checkbox and referring to the
custom codes holding self-inertia values by selecting these from the
corresponding drop lists x, y, and z –axis.
4-15
ShipWeight – User’s Guide, version 10.0, April 2011