[Getdp] Torque and force calculation based on Virtual Work prinzip

[Ruth Vazquez Sabariego]

thank you for the tips, it works if i put one comma behind $Tstator_vw to fix the small syntax error.


Sorry, quickly done...

But still one small question, that means the function VirtualWork [{d a}] is a build-in function by GetDP?
Yes, it is.

I have found that there are also some build-in functions such as

InitMovingBand2D[MB] ;
MeshMovingBand2D[MB];

ans so on used during the .pro scripts, which are not documented anywhere.
Is there any document for such build-in functions or should i have to see the sorce code?

InitMovingBand2D, initialises the structures of the Moving Band.
MeshMovingBand2D, does the actual mesh between the indicated limiting lines.

We will try to add some lines to the documentation…
You can always have a look at the source code :-)

Ruth



best regards from Braunschweig,
Mang Cai


On 08.02.2016 11:39, Ruth Vazquez Sabariego wrote:
Dear Mang Cai,

For the sake of comparison, you can add:

 Print[ Torque_vw, OnRegion NodesOf[Rotor_Bnd_MB], LastTimeStepOnly, Format RegionValue,
    File >  StrCat[Dir,"Tr_vw", ExtGnuplot], StoreInVariable $Trotor_vw,
    SendToServer StrCat[po_mecT, "rotor vw"], Color "Ivory"] ;
  Print[ Torque_vw, OnRegion NodesOf[Stator_Bnd_MB], LastTimeStepOnly, Format RegionValue,
    File >  StrCat[Dir,"Ts_vw", ExtGnuplot], StoreInVariable $Tstator_vw
    SendToServer StrCat[po_mecT, "stator vw"], Color "Ivory"] ;

to the PostOperation Get_Torque.

We have not done it by default because the computation is a bit slow.

Note that if you want to use the virtual work result for the actual movement, you should also modify:

// Torque computed in postprocessing
  Torque_mag[] = $Tstator ;

Best regards,
Ruth
—
Prof. Ruth V. Sabariego
KU Leuven
Dept. Electrical Engineering ESAT/Electa, EnergyVille
http://www.esat.kuleuven.be/electa
http://www.energyville.be<http://www.energyville.be/>

Free software: http://gmsh.info<http://gmsh.info/> | <http://getdp.info/> http://getdp.info<http://getdp.info/> | <http://onelab.info/> http://onelab.info<http://onelab.info/>







On 06 Feb 2016, at 20:58, Mang Cai <<mailto:m.cai at tu-braunschweig.de>m.cai at tu-braunschweig.de<mailto:m.cai at tu-braunschweig.de>> wrote:

Dear sir,

I have analyse the machine_magstadyn_a.pro file of the electrical machines library of the onelab project carefully and found that the electromagnetic force and torque calculation based on the maxwell tensor is implemented. But that based on Virtual Work is only partly implemented, during the postprocessing phase, the Kern function of VirtualWork[{d a}] is unfortunately does not exist.

Can someone give me some advices to complete this work?
Because it should be very useful to compare the force and torque calculated through the two different approaches.

Thank you very much.
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--

M. Sc. Mang Cai

Technische Universität Braunschweig
Institut für Elektrische Maschinen, Antriebe und Bahnen
Hans-Sommer-Str. 66
38106 Braunschweig

Tel:    +49 531 391-3906
Fax:    +49 531 391-5767
E-Mail: m.cai at tu-braunschweig.de<mailto:m.cai at tu-braunschweig.de>
Raum:   212
Web:    www.tu-braunschweig.de/imab<http://www.tu-braunschweig.de/imab>

—
Prof. Ruth V. Sabariego
KU Leuven
Dept. Electrical Engineering ESAT/Electa, EnergyVille
http://www.esat.kuleuven.be/electa
http://www.energyville.be

Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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