General Mechanical

General Mechanical

***ERROR*** Resistivity must be input for velocity effect in elements

    • dhruvdeshwal17
      Subscriber

      Greetings

      This is an error I am facing while doing analysis.

      The analysis - A copper plate and a magnet are placed adjacent to each other with a certain gap. A velocity is given to the plate (-0.1m/s) and the magnet remains stationary. So, as the plate move, the plate will see a change in a magnetic field by which eddy current will be generated in the plate and due to this current a magnetic field will be generated of opposite polarity as that of the magnet. Due to this generated magnetic field, the magnet experiences a force. I FMAGBC the copper plate and parallel flux as a boundary condition.

      My aim is to calculate the eddy current, Lorentz force associated with this analysis, but I am not able to solve it.

      Please provide any suggestion regarding loading, model, or anything you like to suggests

      I am providing Marcos of my problem for a better understanding of the analysis.

      /PREP7  

      !*  

      ET,1,SOLID97

      !*  

      KEYOPT,1,1,1

      KEYOPT,1,2,1

      KEYOPT,1,5,1

      !*  

      KEYOPT,1,1,1

      !*  

      !Real Constants


      R,1,

      RMORE, , , , ,-0.1, ,  

      RMORE, , , , , ,

      !*  

      !*  

      R,2,

      RMORE, , , , , , ,  

      RMORE, , , , , ,

      !*  

      !*


      ! Material Properties  

      MPTEMP,,,,,,,,  

      MPTEMP,1,0  

      MPDATA,MURX,1,,1.2289  ! Permeability of magnet

      MPTEMP,,,,,,,,  

      MPTEMP,1,0  

      MPDATA,MGXX,1,, 

      MPDATA,MGYY,1,, 

      MPDATA,MGZZ,1,,9.26e5  !coercive force of magnet  

      MPTEMP,,,,,,,,  

      MPTEMP,1,0  

      MPDATA,MURX,2,,0.999  ! Permeability of copper plate

      MPTEMP,,,,,,,,  

      MPTEMP,1,0  

      MPDATA,RSVX,2,,1.72e-8 ! Resistivity of copper plate 

      MPTEMP,,,,,,,,  

      MPTEMP,1,0  

      MPDATA,MURX,3,,1  ! Permeability of air


      ! Modelling


      BLOCK,-0.013,0.013,-0.013,0.013,-0.0025,0.0025, ! copper plate

      CYLIND,0.013, ,0.0055,0.0355,0,360,  ! magnet

      BLOCK,-0.05,0.05,-0.05,0.05,-0.05,0.05, ! enclosed area

      FLST,2,3,6,ORDE,2  

      FITEM,2,1  

      FITEM,2,-3  

      VOVLAP,P51X 

      FLST,2,3,6,ORDE,3  

      FITEM,2,1  

      FITEM,2,-2  

      FITEM,2,4  

      VGLUE,P51X  

      /VIEW,1,1,1,1  

      /ANG,1  

      /REP,FAST  

      NUMCMP,VOLU


      ! Meshing 


      TYPE,  1  

      MAT,    1

      REAL,    2  

      ESYS,    0  

      SECNUM, 

      !*  

      MSHAPE,1,3D 

      MSHKEY,0

      !*  

      CM,_Y,VOLU  

      VSEL, , , ,    2 

      CM,_Y1,VOLU 

      CHKMSH,'VOLU'  

      CMSEL,S,_Y  

      !*  

      VMESH,_Y1  

      !*  

      CMDELE,_Y  

      CMDELE,_Y1  

      CMDELE,_Y2  

      !*  

      TYPE,  1  

      MAT,    2

      REAL,    1  

      ESYS,    0  

      SECNUM, 

      !*  

      CM,_Y,VOLU  

      VSEL, , , ,    1 

      CM,_Y1,VOLU 

      CHKMSH,'VOLU'  

      CMSEL,S,_Y  

      !*  

      VMESH,_Y1  

      !*  

      CMDELE,_Y  

      CMDELE,_Y1  

      CMDELE,_Y2  

      !*  

      TYPE,  1  

      MAT,    3

      REAL,    2  

      ESYS,    0  

      SECNUM, 

      !*  

      CM,_Y,VOLU  

      VSEL, , , ,    3 

      CM,_Y1,VOLU 

      CHKMSH,'VOLU'  

      CMSEL,S,_Y  

      !*  

      VMESH,_Y1  

      !*  

      CMDELE,_Y  

      CMDELE,_Y1  

      CMDELE,_Y2  

      !*  

      ALLSEL,ALL


      ! Force Flag

        

      VSEL,S, , ,    1 

      ESLV,S  

      CM,A,ELEM  

      ALLSEL,ALL  

      !*  

      !*  

      FMAGBC,'A' 


      ! Boundary Condition

       

      FLST,2,6,5,ORDE,2  

      FITEM,2,11  

      FITEM,2,-16 

      DA,P51X,ASYM

      FINISH  

      /SOL


      ! Tranisent Velocity

      !*  

      ANTYPE,4

      !*  

      TRNOPT,FULL 

      !*  

      DELTIM,0.002,0,0

      OUTRES,ERASE

      OUTRES,ALL,ALL  

      AUTOTS,1

      TIME,0.01  

      /STATUS,SOLU

      SOLVE  


      Thank You!


    • Navya C
      Ansys Employee
      nWhich Ansys tool are you using for this simulation?.RegardsnNavya?n
    • dhruvdeshwal17
      Subscriber
      HellonANSYS APDL 16.0 (Academic Research)nRegardsn
    • Erik Kostson
      Ansys Employee
      This element is no longer supported - use current elements like solid226.nSee example for more info:nhelp/ans_lof/lof2Dstatmaganalexamples.html#d0e5425nIn low-freq. emag chapter:nn2.5.3. Example: 2-D Static Magnetic Analysis with Velocity EffectsnnHope this helpsnnEriknn
    • dhruvdeshwal17
      Subscriber
      Thank You!n
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