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file1.txt file.txt

Hello Friends and Ansys Gurus,

I have a 3D complex structure, made of many components. Now I was trying to do the reduced transient analysis.
I choose some master degrees of freedom, than applied an impulse force on one of the Master DOFs, and wanted to simulate till 0.3 seconds. After an hour or so, I get an error. Error is:
' You have hit the limitation of CP and CE command combinations.  Please 
check your CP and CE commands'
problem is, I don't understand this error. Itried many times doing this simulation but all the time same error.?? It would be helpful, if somebody has the same error experience and the physics behind that to solve it? Second question is: My model is made up of many components, can I remove some of the components and than do 'reduced transient analysis'??  One more information is that, i did Full transient analysis, there I don't have any problem. Only problem with reduced Transient. So I think it should be on selection of master degrees of freedom or constrains that i apply...??? I don't know. I am helpless im moment. Can some body help me? If you need any data or error file i can provide. I am attaching my error file anyway. Thanks a lot in advanced.    Regards! 

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You should carefully read the warnings and errors - thats your job if you are performing such analysis.
And if so, you should notice that some or many nodes are not used in the current run. That means not all nodes are selected. Try the command NSEL, ALL.
And carfeully check the table of REALS as metioned in the first Error-File.
Gerd

[Diese Nachricht wurde von smittytomcat am 17. Mai. 2012 editiert.]

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Which version do you use?
I remember I received this limitation massage as I used to work with Ansys 11. Having updated to higher versions, this massage no longer appeared.

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Grüße, Moe

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@fahranaz : please read first the error files!

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@ smittytomcat
, Obviously it is v.11. Thanks for clarification.

@ rammps
Well, I would give a try with a higher Ansys version if available.

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Grüße, Moe

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@ smittytomcat

Thanks for your first suggestion!
Today, I tried using 'nsel,all'. I think , i tried also some time ago.  But the same problem with new Warnings like (below)......... and than CP - CE limitation  !
---------------------------------------------------------------------
'*** WARNING ***  SUPPRESSED MESSAGE    CP =      23.422  TIME= 11:34:34
Unused node (908501) on CE number= 5087                               
This CE is ignored.  '
---------------------------------------------------------------------
here is my SOLU code, in case you see something strange? It is fairly simple.
************
finish
/solu
antype, 4                  ! Transient analysis
trnopt,reduc,,NODAMP      ! Full Solution Method
deltim,0.005
!
cmsel,s,comp1
! set all translational DOFs to 0
d,all,ux,0
d,all,uy,0
d,all,uz,0
! set all rotational DOFs to 0
d,all,rotx,0
d,all,roty,0
d,all,rotz,0
!
allsel
cmsel,u,AC
lumpm,0
nsel,all
outres,all,all
total,1000,1
!
kbc,0
! Impulse_response
F, 718802,Fx,-100000      ! node 500503
time,0.01
kbc,0
lswrite,1
!
fdele,718802,all
time,0.3
kbc,0
lswrite,2
lssolve,1,2,1
*******************

@farahnaz

thanks for sharing your experience with Ansys 11. I have to try it with higher version to figure it out if it is a version specific problem? Let you knw once tried. May be CP and CE Limitations are different in different version???? 
for the info: I have an academic version of Ansys 11 (not commercial)

Gruss! 

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The warning "unused node ..." menas that this node is not connected to any element.
Perhaps You should use the follwoing commands to select all nodes not connected to elements:

Esel,all
nsle,s,1
nsel,inve

if there are nodes selected, you should set up again your constrainst again after deleting all unused nodes.

Gerd

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Thanks Gerd,
I could remove almost all the warnings related to the unused nodes, and many others using your three line code  . So now the warning file has 4-5 warnings. But still my simulation is stopped, with same error message after 1 hour or so  . ('CP and CE ..Limitation'. )
Strange is that if I do full transient analysis using same boundary condition, than same 4-5 warnings appear on error file but simulation runs without any problem. So i don't understand where exactly i am making mistake? The main difference between reduced and full is the master degrees of freedoms in reduced, which i choose 'total,2000,1' which is i think enough, as i need till first 500 modes approximation. Any other suggestion?? Thanks in advanced!   

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hello Moe  hello Gerd,

higher version of ansys solved the problem.    thanks a lot!

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