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1    Total mass calculation

Now that the whole ship itself is in place, you are ready for some analysis functionality.

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• Include the following parameters in entity Mass calculation: Mass, COGX, COGY, COGZ, MOMX, MOMY, MOMZ and QEntityRef.
• Create the following relations in the Knowledge Browser and connect them to the pertaining parameters in entity Mass calculation.

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• .

Mass = SUM(@QEntity, 1, @Mass)

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(The result will be the summation of all parameters

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Mass

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of the

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entities one level below.)

COGX = MOMX/Mass

COGY = MOMY/Mass

COGZ = MOMZ/Mass

MOMX = SUM(@QEntity, 1, @MOMX)

MOMY = SUM(@QEntity, 1, @MOMY)

MOMZ = SUM(@QEntity, 1, @MOMZ)

• To show computed values during a dialogue write “@SHOW” behind “QEntityData”set attribute @SHOW on QEntityData.
• Assign the following text for “QEntityRef”; “Mass to QEntityRef: “Mass calculation: summation of light ship weight and total cargo weight”

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Figure 79: Entity "Mass calculation"

2.4.1      Light Ship Weight

First include the Entities:

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• Include the following parameters in Entity “Light Ship Weight“: “Mass”, “COGX”, “COGY”, “COGZ”, “MOMX”, “MOMY”, “MOMZ “and “QEntityData”.

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• weight”.

Please note, that you just created 'normal' relations and connected these to the parameters in the entity, because these are going to be used in several Mass entities.

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2     Light Ship Weight

• Include the entities: Mass Hull, Mass Decks and Mass Bulkheads as children of Light Ship Weight. All three are singular obligatory.
• Include the following parameters in entity Light Ship Weight: Mass, COGX, COGY, COGZ, MOMX, MOMY, and MOMZ.
• Connect the same relations as above from the Knowledge Browser to the pertaining parameters in

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• Mass = SUM(@QEntity, 1, @Mass) ; The result will be the summation of all parameters “Mass” of the Entities one level below.
• COGX = MOMX/Mass
• COGY = MOMY/Mass
• COGZ = MOMZ/Mass
• MOMX = SUM(@QEntity, 1, @MOMX);
• MOMY = SUM(@QEntity, 1, @MOMY)
• MOMZ = SUM(@QEntity, 1, @MOMZ)entity Light Ship Weight.
• To show computed values during a dialogue write “@SHOW” behind “QEntityData”set attribute @SHOW on QEntityData.

2.4.1.1     Mass Hull

Create the following parameter in the Knowledge Browser.

• Include the following parameters in Entity “following parameters in entity Mass Hull“: “Mass”, “COGX”, “COGY”, “COGZ”, “MOMX”, “MOMY”, “MOMZ “, “Volume”, “ and Weight_volume_factor” and “QEntityData”.
• Create the following relations in

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• entity Mass Hull (here, 12 is the entity ID of Main Dimensions, change this for your case):

COGX = (

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ENTITY#(

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12).Lpp)*0

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.5 (assume the centre of gravity of the hull in X direction half of the ship length

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)

COGY = 0

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(amidships)

COGZ = (

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ENTITY#(

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12).Dm)*0.45

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(assume the centre of gravity of the hull in Z direction at 45 % of the moulded depth

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)

MOMX = COGX*Mass

MOMY = COGY*Mass

MOMZ = COGZ*Mass

• To show computed values during a dialogue write “@SHOW” behind “QEntityData”.set attribute @SHOW on QEntityData.
• Make parameter Volume in entity Mass  use local properties ("Instantiate").
• Create the following relation in entity Mass Hull (here, 13 is the entity ID of Hydrostatics, change this for your case):
• Volume = ENTITY#(xx13).Volume
• ; for xx fill in the value of QEntityID of Entity ”Hydrostatics”. Make sure to instantiate this parameter and remove @MODIFY because you do not want to allow this at this position.
• Mass = Weight_volume_factor*Volume

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