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To check/change your user level go to the general tab of  Tools>Options. You can change your User level. If you are not able to change it to Knowledge Engineer (level 3), you do not have KE rights. Please contact your ICT department or Qnowledge for the proper license.

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  Add the following relation (belonging to fresh water) in a similar way as described above

Rho = 998

5    Creating constraints

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Now  the relation Rho = 1025 and select Constraint->Add New. In the upper part of the new window enter the following constraint:Watertype$= "SW"

and press Save (figure 7).

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   Select Watertype$ in the knowledge browser, and add the following text as reference text in the frame viewer (figure 9):

Watertype: 

SW<eq>Saltwater  

FW<eq>Freshwater

Figure 9   A dropdown box is created by entering this information in the reference slot of the frame viewer

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   Add the following relation to the class Main Dimensions:DISP= Cb*Lpp*B*T*Rho/1000

which defines the displacement of the ship in tons

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  Enter the following data for our first calculation:        B= 10   Cb= 0.55   Lpp= 60   T= 6   Watertype$= SW (Salt Water)

Note that the input of Watertype$ consists of a dropdownbox, which we created in (4), see figure 11. 

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