Apply force (as tabular) using APDL Command SFE

- June 30, 2020 at 11:25 am
  
  DESOJIB
  Subscriber
  
  Hi all,
  
  I am trying to apply Force on a surface in Harmonic Response Simulation. Force is in Tabular form having Real and Imaginary component in x,y,z direction and diffrent frequency. shown as below.
  
  can any body help how can i apply this force on a surface using SFE command. I have converted 3D elements on Surface in 2D 156 Elements. here is my APDL script
  
  /PREP7
  
  et,101,154
  
  cmsel,s,face
  
  type,101
  
  ESURF
  
  allsel,all
  
  /com,*********** Define Force Using Surface Effect Elements ***********
  
  local,12,0,0.,0.,0.,0.,0.,0.
  
  csys,0
  
  et,101,154
  
  esel,s,type,,101
  
  keyop,101,7,1 ! Use original area so load is constant in large deformation
  
  keyop,101,11,2 ! Use real and not project area
  
  esel,all
  
  /com,****************************************************
  
  /com,******************* SOLVE FOR LS 1 ****************
  
  
  
  *DIM,x,TABLE,2,1,1,FREQ,
  
  ! Frequency values
  
  x(1,0,1) = 0.
  
  x(2,0,1) = 200.
  
  ! Load values
  
  x(1,1,1) = 0.
  
  x(2,1,1) = 10.
  
  *DIM,xi,TABLE,2,1,1,FREQ,
  
  ! Frequency values
  
  xi(1,0,1) = 0.
  
  xi(2,0,1) = 200
  
  ! Load values
  
  xi(1,1,1) = 0.
  
  xi(2,1,1) = 0.507098511632205
  
  esel,s,type,,101
  
  nsle
  
  /SOLU
  
  sfe,all,,pres,1,%x%,
  
  sfe,all,,pres,2,%xi%
  
  /NERR,999999
  
  There i am getting error :
  
  *** ERROR ***                           CP =       0.938   TIME= 14:56:00
  
  There are no degrees of freedom active.
  
  *** ERROR ***                           CP =       1.094   TIME= 14:56:00
  There are no degrees of freedom active.
  
  *** ERROR ***                           CP =       1.094   TIME= 14:56:00
  There are no degrees of freedom active.
  
  *** ERROR ***                           CP =       1.094   TIME= 14:56:00
  There are no degrees of freedom active.
  
  *** ERROR ***                           CP =       1.094   TIME= 14:56:00
  There are no degrees of freedom active.
  
  *** ERROR ***                           CP =       1.094   TIME= 14:56:00
  There are no degrees of freedom active.
  
  Regards,
  
  Bhavin

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