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changes.mady.by.user Sicherer-Roetman, Anneke

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changes.mady.by.user Frank Tap

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1    Adding parameters to Hydrostatics Image Added

  • Create a new class alongside Dimensions and call it General.
  • Create the following parameters (all are values) within the Knowledge Browser:

Parameter name

Dimension

Determined by

Reference

In Class

Cb

[-] (none!)

VR: User only

Block coefficient

Dimensions

Displacement

[t]

USR: User or System/equation

Displacement of vessel at design draft

Dimensions

Rho

[t/m^3]

VR: User only

Density of water

General

T_design

[m]

VR: User only

Design draft of ship

Dimensions

Volume

[m^3]

USR: User or System/equation

Hull volume at design draft

Dimensions

 

  • Next drag and drop the parameters: Lpp, Boa, Cb, Displacement, Rho, T_design and Volume from the Knowledge Browser into the entity Hydrostatics.

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2    Creating a drop down box Image Added

Because their will only be two possible values for parameter Rho (1.025 or 1.000 [t/m3]), it is useful to create a dropdown box. This can be done by providing a special reference.

  • Select the Parameter tab of the Properties window for Rho.
  • In the Reference field type the following:

Density of water. Select water type;
1.025<EQ>Saltwater
1.000<EQ>Freshwater

3    Creating entity relations

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  • Enter the following relation and click Save.

Boa = ENTITY#(12).Boa

This means Boa is equal to (will copy the value of) the Boa of the entity with QEntityID = 12.

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  • Create an entity relation for Lpp in entity Hydrostatics in the same way. This parameter must be equal to the value of Lpp in Entity Main Dimensions:

Lpp = ENTITY#(12).Lpp

Finally, relations must be provided to calculate Displacement and Volume in entity Hydrostatics. The following calculations should be made:

Displacement = Cb * Lpp * Boa * T_design * Rho

Volume = Cb * Lpp * Boa * T_design

  • Create an entity relation for Volume in the same way. Delete ENTITY#()in the editor and enter the expression above.

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