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CMS substructuring
 
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martin.ulriksen
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Joined: 17 May 2012
Posts: 35

PostPosted: Sat Jun 16, 2012 3:32 pm  Reply with quote

Hi,

I'm trying to make a CMS analysis in ANSYS Workbench 14.0. The superelement is going to be the middle element in a cantilever beam with 3 elements. But I can't get it to work.

The generation code is (taken from a tutorial):

/FILNAME, FIRSTWHEEL ! Name of the Superelement is FirstWheel
/SOLU


/COM, SELECT A SET OF NODES FOR POINT OF APPLICATION OF HARMONIC DISPLACEMENT ON THE FIRST WHEEL
NSEL, S, NODE, 1001 , N1 ! Select the node n1 as a new subset
NSEL, A, NODE, 1002 , N2 ! Additionally select the node n2 and extend the current set

M, ALL, ALL ! Define them as master nodes

ALLSEL, ALL
CMSEL, ALL

NUM_MODES = 100 ! Number of modes to extract for each component = 100
/SOLU
ANTYPE, SUBSTR ! Perform a substructure analysis
SEOPT, FIRSTWHEEL, 2 ! Generate the stiffness and mass matrices
CMSOPT, FIX, NUM_MODES, 0, 100000 ! Use fixed-interface method to extract 100 modes between 0 and a
! large number
! associated with the first wheel and the attached shaft
ESLN, S ! Select a new set of elements attached to the selected nodes
SOLVE
FINISH
SAVE

This is used in a modal analysis. Therefore, the superelement is transferred to another analysis file. Am I only supposed to copy the .sub file or should I copy other files?
In the modal analysis I use this command:

/FILNAME, USE
/PREP7
*GET, MAX_ETYPE, ETYP, , NUM, MAX ! Retrieve the value of the maximum element type number (what should I write here?)
! and store it as MAX_ETYPE
ET, MAX_ETYPE+1, 50 ! Define Matrix50 as the next element type number
TYPE, MAX_ETYPE+1 ! Assign this type number to the elements
MAT, 1 ! Assign 1 as the material number to subsequently defined
! elements
REAL, MAX_ETYPE+1 ! Set the element real constant set attribute pointer
SE, FIRSTWHEEL ! Define the superelement associated with the Wheel1

FINISH

This do not work when trying to run a modal analysis. Is there anyone out there who can tell me what I'm doing wrong? Would be relly appreciated.

Regards,
Martin Ulriksen
Aalborg University
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umut.tabak
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Joined: 08 Apr 2012
Posts: 30

PostPosted: Tue Oct 09, 2012 7:38 am  Reply with quote

Quote:


I am not sure but I have a plate example for this and if you are interested and still could not find the solution I can send it to you, let me know.

_________________
Umut Tabak
Delft University of Technology
Precision and Microsystems Engineering
Engineering Dynamics
Mekelweg 2, Delft, The Netherlands
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martin.ulriksen
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Joined: 17 May 2012
Posts: 35

PostPosted: Tue Oct 09, 2012 7:46 am  Reply with quote

Dear Mr. Tabak,

Thank you very much for the reply.

I found out how to do it myself, so everything is good.

Kind regards,
Martin Ulriksen
Student, Aalborg University
Denmark
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rithesh.baliga
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Joined: 29 Jul 2015
Posts: 3

PostPosted: Wed Oct 14, 2015 3:01 am  Reply with quote

Dear Sir

I am looking to use the technique. please send me the file
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rithesh.baliga
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Joined: 29 Jul 2015
Posts: 3

PostPosted: Wed Oct 14, 2015 3:03 am  Reply with quote

with regards
Rithesh Baliga B
MTech Computer aided mechanical design and analysis CAMDA(2014-2016)
MIT Manipal
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