Weight/CG and Cost Tracking
The RhinoMarine Model Management module adds new properties to Rhino objects that allow you to attach weight and center of gravity (CG) and cost information to them. The weights and CG's and costs are then totaled in the Weight/Cost editor dialog. Weight/CG data can also be seen in the Weight Editor dialog in the RhinoMarine Hydrostatics dialog box. Cost is divided into two categories: Material Cost and Labor Cost.
The weight of an object may be specified directly (e.g., in pounds, kg, etc.), or as a weight density. The weight density depends on the object type:
Object Type Weight Density Point n/a Curve Weight/Length (e.g. lbs/ft, kg/m, etc.) Surface Weight/Area (e.g. lbs/ft^2, kg/m^2, etc.) Mesh Weight/Area (e.g. lbs/ft^2, kg/m^2, etc.) Solid Wt/Area OR Wt/Volume
In a similar fashion, the costs may be specified directly, or as a "cost density" (cost per unit length, area, volume, or weight).
Here is an example of the Rhino Properties dialog, with a surface selected in the model.
Note that the drop down list at the top of the dialog has been used to select the "RhinoMarine Weight Properties" property. Since it is a surface, the user has the choice of entering an area weight density or the actual weight.
When "RhinoMarine Cost Properties" are selected, the dialog will look like the following:
Once the properties have been set, you can see a list of the objects and their weight and cost in the Weight/Cost dialog:
The data may be exported to an Excel spreadsheet, with separate worksheets for Weight and Cost. The objects will be organized according to the hierarchy that you have set up in the RhinoMarine Explorer tree. The computed values (weight and cost) are entered in the spreadsheet as formulas rather than values, so once in the spreadsheet you can experiment with different weight and cost densities.
The Weight data can also be used as input to your RhinoMarine hydrostatics calculations. From the "Calc" tab of the RhinoMarine Hydrostatics dialog, click on the Weight Editor button. Once in the Weight Editor, check the "Include Geometry" box, and you will see a list of your items, with their weights and CG's. Note that you can still add weight items at the bottom of the list, for any weight that is not represented in the model.
At the bottom of the Weight Editor you will see the overall weight and CG, which will be used in your hydrostatics calculations if you have selected "Displacement/CG" or "Displacement/CG/Trim" as your Flotation Plane Definition.