Mode-superposition harmonic analysis using APDL macros

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  • Last Post 07 August 2018
marius_aachen posted this 07 August 2018

Hello ANSYS community,

I'm working with APDL macros to run a linear harmonic analysis using mode-superposition in ANSYS 18. The harmonic analysis works well for the first defined load vector, however when I try to restart the modal analysis to define another load vector I get the following error message:

"Element order vector is not found in the database. The previous modal  solution is probably not saved into the db file or wrong database is used."

I attached the relevant extracts of the APDL code I'm using. The error message occurs in the main file in the line with the solve command of the restarted modal analysis. If you need further macros please let me know.

I'm grateful for any idea you may have.

Kind regards,

Marius Hensgens

harmonic-analysis apdl

Attached Files

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SandeepMedikonda posted this 07 August 2018

Marius, 

  Can you use a Blockquote/Preformatted styling and paste the relevant APDL code?

~Sandeep

marius_aachen posted this 07 August 2018 

/solu
allsel
antype,modal
modopt,modeExtrMethod,maxNumModes,modStartFreq,modStopFreq
resvec,resvKey                        
outres,erase            
outres,all,none
outres,nsol,all
outpr,erase
outpr,all,none
save
/output,'modal','txt'
solve
/output,'%jobname%_2',txt,,append
finish

save,modRes
parsav,all

*do,exInd,1,exNum,1

  *do,sliceInd,1,numSlices,1
     
     parsav,all
     resume,modRes
     parres
   
     modeOrder  = exMat(1,exInd)
     radTan = exMat(2,exInd)
     cosSin = exMat(3,exInd)

     ATOFORCIT !Macro creating load vector

     /solu
     antype,modal,restart
     allsel,all
     solve
     finish

     minMode = 1     
     maxMode = numModes
     modeInd = '%minMode% through %maxMode%'

     /solu
     allsel

     antype,harmic                        
     hropt,msup,maxMode,minMode,mCout
     harfrq,harStartFreq,harStopFreq           
     hrout,reImKy,clust,mCont           
     lvscale,1              !! Scale Down Any Loads/acel Because They Are Already Applied From LVSCALE
     kbc,1                            
     nsubst,nsbstp              

     dmprat,dampRatio                   
     resvec,resvKey                      
     outres,erase                      
     outres,all,none                                                            !! SVAR: State variables; LOCI: Integration point locations
     outres,nsol,all                     
         
     outpr,erase
     outpr,all,none                   
  
     save
     solve
     finish

     MCFCTRL.MAC !! Modal coordinates store
 
  *enddo
*enddo
         

I should additionally mention that this code works with ANSYS version 14.5. However, this code should run with ANSYS 18 and at the moment this is not the case.

SandeepMedikonda posted this 07 August 2018

I can't tell of error errors in there...maybe someone else can. It is possible that the restart solution overwrote the files needed for the modal restart. 

Can you go through Example 5.8 in the help that describes a modal analysis restart and see if you are missing something?

~Sandeep

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