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Eigenvectors or vibrating modes from CREO Simulate

Visitor

Eigenvectors or vibrating modes from CREO Simulate

Hi,

 

I am running a modal analysis of some componentes on PTC CREO Simulate. But the results produced by the simulation are only the natural frequencies (eigenvalues) and a graphic representation of the natural modes.

 

However I need a matrix with the eigenvectors of the problem. I am sure that there is a routine inside the Simulate that produces this information (otherwise, how could the program display a graphic representation of the modes?). Do anyone know if it's possible to extract the numerical matrix from the simulation analysis?

 

Thank you!

9 REPLIES 9

Re: Eigenvectors or vibrating modes from CREO Simulate

You had posted in the Mathcad section of this forum.

You should ask a mod to move your question over to the Creo forum.

Re: Eigenvectors or vibrating modes from CREO Simulate

Re: Eigenvectors or vibrating modes from CREO Simulate

mode1_4.JPG

Re: Eigenvectors or vibrating modes from CREO Simulate

Ascii.PNG

Re: Eigenvectors or vibrating modes from CREO Simulate

yes, of course

ascii.JPG

Re: Eigenvectors or vibrating modes from CREO Simulate

I really appreciate your help, my friends. Especially skunks and sweetpeahub, thank you!

 

I did what you suggested and the files are here for each of the 12 modes I have requested from the simulation.

 

Now my question is about the results. The default result is a text file with 4 rows. Can you help me to interpret these results? What means each one of the rows?

Re: Eigenvectors or vibrating modes from CREO Simulate

See the reference document.  

  

https://community.ptc.com/t5/Simulation/how-do-I-output-element-stresses-strains-in-tabular-format-i...

 

.d0x

h-node ID, vector(X, Y, Z)

 

Displacements doComputeMaxMag dontNormalize 7 7 0 -1.000000E+00 3.552309E+02
16182 8.994347E+01 3.461115E+01 -9.662632E-01
5572 9.172775E+01 3.529779E+01 -9.854165E-01
...

 

.neu

h-node ID, node location (X, Y, Z)

h-nodes 40025
16182 1.879850E+03 -1.320951E+03 1.601173E+03
0 0 0 0 0 0 0 0 0
5572 1.880184E+03 -1.321894E+03 1.598402E+03
0 0 0 0 0 0 0 0 0

...

Re: Eigenvectors or vibrating modes from CREO Simulate

Once again, I really appreciate your help, my friends!

 

But now I need to build mass, stiffness and damping matrices from CREO results or even extract them from CREO analysis. Do you know someway to do it?

 

Thank you,

Leonardo

Re: Eigenvectors or vibrating modes from CREO Simulate

Looking at *.pas file using notepad++. you will find that no file is written of such sizes.  The largest file written for this example was the *.s01 with a size of 265MB.  (of course depends on result plotting grid)

note: # of elements * average element matrix size = size of element file

88335*14.9152kb=1,317,534kb=1.31753gb

 

MatrixSize.PNG

 

Until / if ever / CREO supports submodelling or other such matrix element capability, I doubt they will have any matrix exporting option... for many good reasons.

 

Based on the types of questions you have, I suggest looking at some other software than CREO for your research.