Now that the ship lay out is finalized, the first analysis, Mass calculation, can be performed. Incidentally, it is always possible to change the values you entered in the previous section. The child entities of Mass calculation
are:
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In the Mass Calculation
entity, which is a subgoal of the total solution, the mass and the centre of gravity of the whole system will be calculated. These quantities depend on the mass and centre of gravity of both the ship itself (Light Ship Weight
) and the cargo it carries (Mass Cargoes
). The total mass is calculated by the summation of all mass components. The centre of gravity of a system of components is defined as the average of their positions, weighted by their masses. This method is used at every level (entity/subgoal) of Mass calculation
.
At the level of entities In the entities Mass Calculation
and Light Ship Weight
(and Mass Cargoes)
no input is requested to requested from the user.The first 'stop' in the calculation process is in Mass hull
.
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Quaestor will calculate all information in these entities when all required information from lower entities is available. You can see this because these entities are still colored red. A yellow cell will be calculated by a relation.
Based on the results of the entities Main Dimensions
and Hydrostatics
(in Ship design | Lay out | Hull
), the centre of gravity and volume of the hull is determined. Scroll through the parameter list to see the used relations in the Explanation window. For this simplified ship configurator it is assumed that the mass of the hull can be computed by:
...
In the previous section, you defined the names and positions for two decks. Entity The entity Decks
presents a table which contains a number of parameters for each defined Deck
.
...
Weight_area_factor
s of the bulkheads and press Enter.That The last thing to do for the mass calculation is entering data for the cargo objects. You'll know how to do this. For this tutorial, limit yourself to a few objects, because otherwise you will have a lot to enter! Note that there is a picture of the coordinate system to help you in the Explanation window. For two pieces of cargo, the input will look something like this:
The mass and centre of gravity of the whole system are input for the intact stability calculation. For this tutorial a very unrealistic simplified stability |Co calculation is developed. The moment of area inertia of the waterline water plane area is the only required input value.
Entity “The entity Intact stability
” is only included to give an idea how a configurator can be build built with a taxonomy approach. Example input values for Entity “the entity Intact stability
” is presented in Figure 28.
Figure 28: Intact stability calculation
...
are presented below:
At the moment you leave Entity “the entity Intact stability
” with the "Accept input & Continue" button Next button, Quaestor jumps automatically in Entity“Data to the entity Data to Word
report”report
. In here Here you do not have to provide any input values. Quaestor will directly generate (if all information from the previous Entities entities is available) a little MS Word report. When you have this document open at that moment, you will see the generation of the reports taking place on your screen.
Note |
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Be aware that fatal errors may occur when you are actively working in Word while the reports are generated. Therefore, please wait until the documents are closed. |
There are two ways to open the created Word documented from inside Quaestor.
Report_document$
in Entity “Example report” and click the entity Example report
and click on “Click here for value” in ” in the Explanation window below “Name, value dimension & dimension”group”.Report_document$
(in Figure 29 “Report_151212_2.doc”).FinallyOf course, it is always possible to find and open the document in your project folder on your computer. The example report document is built up from two sub documents (two chapters) that also can be watched / opened separately.
Figure 29: Generation of example MS Word report
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The main dimensions and a table of deck data will also be will be written to an Excel file too. In here Here, the total deck area will be calculated and the result will be send back to Quaestor in parameter “Total_deck_
area”, see Figure 30area
. If Quaestor knows all the required data, the Excel file will be made at the moment you are in Entity “Data to Excel”.Please note that the visit the entity Data to Excel
.
Info |
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The knowledge engineer (the developer) can decide whether to leave |
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an Excel sheet (or |
...
Word document) open, or close it automatically. In the case of the Excel sheet, it |
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was decided to leave the Excel sheet open. |
There are two ways to open an Excel file from Quaestor.
File_name_Excel$
in Entity “Data to Excel” and click the entity Data to Excel
and click on “Click here for value” in ” in the Explanation window below “Name, value dimension & dimension”group”.File_name_
Excel$ (in Figure 30 “Deck_data_153402.xls”).Excel
$
.Of course Finally it is always possible to find and open the document in your project folder on your computer .
Figure 30: Data to Excel(The default path for the Ship_configurator is C:/Users/Public/Documents/My_Knowledge/Projects/_Ship_configurator/Solutions
).
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If you are a Knowledge Engineer, you might want to continue with the tutorial explaining how the database that was used here can be developed. |
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