| Q about structure of ISO 80000 and QUDV in SysML Papyrus and how to apply it. [message #1843775] |
Tue, 17 August 2021 15:26  |
 Marnix Verkammen
Messages: 4
Registered: August 2021 |
Junior Member |
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Dear all,
I have limited experience with SysML, but I am part of a team creating some form of mapping between a SysML software and another MBSE tool.
I want this mapping to be ale to interpret the ISO 80000 package, but for this, I first need to know how this package works in Papyrus.
I am using the ISO80000 library given in Commnent 6 of this bug-thread: Comment 6 of this Eclipse bug discussion: https://bugs.eclipse.org/bugs/show_bug.cgi?id=478131#c6
I am unsure as to how the new units or QuantityKinds (QKs) should be defined.
Let's assume that I want to create the unit Newton from scratch (not using the one in the ISO 80000 package), stating that it is a unit derived from kg, m and s (km/s^2).
Do I then need to create and InstanceSpecification with as name Newton and as classifier DerivedUnit (taken from the QUDV modelLibrary)?
I have tried creating a normal SysML unit, than change its classifier to derivedUnit, but then the unit transforms itself into an InstanceSpecification. Hence why I think one should create an instanceSpecification.
My question then is: how does one assign the factor, unit and (primary)quantitykind, as shown in Figure E.9 of OMG' s System Modelling Language v1.5 document? I place the figure below.
I see that these relationships exist in the QUDV modelLibrary in Papyrus, however I am unsure how to drag them (?) under the newton Derived Unit.
Would someone be so kind as to give more information, or a resource in which this can be found? I have searched quite extensively on the internet, but have yet to find a manual, forum thread, etc. about using the QUDV library in Papyrus.
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A second question I have regards the structure of the pre-existing Units, Valuetypes and QuantityKinds. Are they linked properly in the Papyrus ISO 80000 package? By that I mean for instance: Are the unit and quantityKinds of a ValueType properly defined? I see that most (if not all, since I have not checked all of them of course) Valuetypes have empty Units and QKs. An example of this is <<ValuetType>>mass(zeptogram), see image below.
In the same line of thought: Are prefixed units (or derived units for that matter) actually defined as described in the OMG SysML document? As far as I can see prefixedUnits such as zeptogram have two slots: one for the name (in an instanceValue) and one for the prefix. The latter seems to be also an instanceValue with "zepto" written in it. Hence, I am not sure if it is in any way connected to the prefix "zepto" defined in ISO 80000-1
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I look forward to your help or advice.
Kind regards,
Marnix.
PS: if this thread is better suited elsewhere, please do move it. I could not find any better place in this forum than here.
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