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vj-31-Visitor
1-Visitor
February 25, 2026
Question

Mechanism is not moving for 0.5ms duration dynamic analysis

  • February 25, 2026
  • 1 reply
  • 61 views

Hi,

I am trying to run a dynamic simulation for my assembly. It contains the the lever arm with the pivot at the center of the arm. One end I have mass which generates the force of 25N in one direction. I apply 600N of force on the other end in opposite direction (force curve will start at (0,0) to (0.5ms, 600N)). I have the below setting and it seems like the lever is not rotating. Do we need to change any setting if the duration is very small.

 

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1 reply

S
SweetPeasHub17-Peridot
17-Peridot
February 26, 2026

This should easily be calculated by hand.

You did not mention the lever configuration, but a free mass of 2.5kg with an average force applied of 300N for 0.5ms moves the mass 0.015 mm.

These very tiny movements will at least require significant changes to several Creo settings and may not even work at all.

I am not sure about these helping but here are some suggestions to try:

IN FILE - PREPARE - MODEL PROPERTIES (this is tied to the assembly you are using)

1.  Accuracy (for CAD), make accuracy absolute and small enough to capture the tiny motion. maybe <0.00003 mm  because of 0.015mm / 500 frames

2. Mechanism, make relative tolerance * characteristic length small enough. Likely need relative tolerance like 1E-7 or 1E-8.

 

You may need a configuration file change:

accuracy_lower_bound

 

Also, you can try a model with larger time duration that works (like 1000ms) and gradually decrease the loading time. Adjust parameters above when motion is no longer correct to see if they improve the result. Use hand calculations to verify as you go...

 

 

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