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J
JesseStevenson110-Marble
10-Marble
December 2, 2025
Question

Large Displacement at 0 frequency in dynamic frequency analysis of bolted assembly bracket.

  • December 2, 2025
  • 1 reply
  • 219 views

Hello,

 

Looking for an explanation of some strange results I am getting in Creo simulate.  I am wondering if I have the model setup incorrectly.  The model is not that complicated.  its a bolted assembly with some external masses (sensors) that are associated to the bracket via mass elements and weighted links.  

 

I am trying to understand displacement of the mass elements when they are excited at resonance.  The oddity I am seeing is the massive displacement at frequency 0 (clearly not a real result).  

 

Any help or thoughts on this matter would be great!  See the details i have posted below.

JesseStevenson1_0-1764696757360.png

JesseStevenson1_1-1764696842396.pngJesseStevenson1_2-1764696937433.png

JesseStevenson1_3-1764696997484.png

JesseStevenson1_4-1764697018289.png

JesseStevenson1_5-1764697037677.png

 

 

 

 

 

1 reply

C
Chris321-Topaz I
21-Topaz I
December 2, 2025

I would try

 

1. checking your mass units

2. Checking the modulus of your parts

3. looking at the deformed plot and seeing if it looks like you expect

4. Changing the input to 0 and making sure you get an output of 0

5. Run a static analysis and check the results from that

J
JesseStevenson110-MarbleAuthor
10-Marble
December 2, 2025

Thanks for the advice @Chris3, but the anomaly is still present.  after digging i thought that maybe there was a rigid body mode that I did not identify.  But there are not rigid body modes reported in the modal analysis.  i am going to remove the mass and weighted links to see if the problem resolves.

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