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Adding parameters to Hydrostatics
Create a new class along side Dimensions and call it General.
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- Create the following parameters (all are values) within the Knowledge Browser
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- :
Parameter name | Dimension | Determined by | Reference | In Class |
| [-] (none!) | VR: User only | Block coefficient | Dimensions |
| [t] | USR: User or System/equation | Displacement of vessel at design draft | Dimensions |
| [t/m^3] | VR: User only | Density of |
water |
1.025<EQ>Saltwater
1.000<EQ>Freshwater
General | ||||
| [m] | VR: User only | Design draft of ship | Dimensions |
| [m^3] | USR: User or System/equation | Hull volume at design draft |
The parameters “Cb”, “Rho” and “T_design” will be user input so select for these parameters in the Slots & Properties window “VR: User only” in the “Determined by” field.
As mentioned above, for the other parameters you do not have to change the “Determined by” field. Leave these parameters as USRbecause we are going to create Entity relations for these parameters.
Next drag and drop the parameters: “Lpp”, “Boa”, “Cb”, “Displacement”, “Rho”, “T_design” and “Volume” from the Knowledge Browser into the Entity “Hydrostatics”, see Figure 57.
Dimensions |
- Next drag and drop the parameters:
Lpp,Boa,Cb,Displacement,Rho,T_designandVolumefrom the Knowledge Browser into the entityHydrostatics.
The parameters Displacement and Volume still have their red crosses because they are not completely defined. You will add relations for them in a minute.Figure 57: Include parameters in Entity "Hydrostatics"
2.3.3.1 Create drop down box for parameter Rho
Select water type;
1.025<EQ>Saltwater
1.000<EQ>Freshwater
Because we want to provide only two options for parameter “Rho” (1.025 or 1.000 [t/m3]), it is useful to create a dropdown box. This can be done by providing the reference text as indicated in Figure 58 in the Frame Viewer. (This is also why the table above showed this as reference text for Rho).
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