Learning Forum

[Hongtian CHEN]

When I did a random vibration analysis, after using the code below to draw the psd graphic in apdl, it works well:

...

PSDCOM

PSDRES,DISP,ABS                     !PSDRES, Lab(DISP/VELO/ACEL), RelKey(REL/ABS/OFF)

PSDRES,VELO,ABS

PSDRES,ACEL,ABS

SOLVE

FINISH

/POST26

STORE,PSD,5

NSOL,2,NODE0,U,X

RPSD,3,2,,3,1

/SHOW,JPEG

PLVAR,3

which mean I use /POST26 in the same file, it works well for a spectrum analysis.

 

However, when I do the part of solution in a file named "Pipe_3A_Transient_Analysis", and use the command "SAVE" to finish the solution part and save the file:

...

PSDCOM

PSDRES,DISP,ABS                     !PSDRES, Lab(DISP/VELO/ACEL), RelKey(REL/ABS/OFF)

PSDRES,VELO,ABS

PSDRES,ACEL,ABS

SOLVE

FINISH

After that, in a new file named "Pipe_4_Post26_TimeHistory", I use the command below to reload the results of  Pipe_3A_Transient_Analysis:

FINISH

/CLEAR

/FILNAME,Pipe_4_Post26_TimeHistory,1

/TITLE,HAHA

/REPLOT

/COM,STRUCTURAL

/UNITS,SI

*AFUN,RAD

PI = 3.14159265354

RESUME,'Pipe_3A_Transient_Analysis','db','.'

/POST26

FILE,'Pipe_3A_Transient_Analysis','rst'

STORE,PSD,5

 

the error occurs, in my opinions, it means the .rst file could not be open successfully. 

Because when I do the same operation using the GUI, after clicking on the "TimeHist Postproc", the second GUI occurs, which corresponds to the command "FILE,'Pipe_3A_Transient_Analysis','rst'.

However, after that, for a spectrum analysis, there is another GUI:

which has not a corresponding command to make a choice. I think it is a bug, what do you think, and are there any way to solve this question with an APDL command???

(if I click OK with the GUI method at this moment, it can enter the TimeHist Postproc module, and the command like STORE,PSD/NSOL,.../ESOL,... works well after that, but I want to just use the APDL command, it seems that only the command /POST26 and FILE,'Pipe_3A_Transient_Analysis','rst' could not enter the TimeHist Postproc module correctly for the spectrum analysis case. )

 

[dlooman]

Personally, I try to avoid using the APDL gui for anything PSD related.  It seems you already know the commands.  Just issue them in batch mode and if you want to capture a plot use /show,png.  The gui isn't being maintained, so even if there is a bug, it doesn't matter.