Modal analysis gear

Oleksandr Grinenko

14 Jul, 2025 03:29 PM

In this tutorial - modal analysis for bicycle gear part.

Simulation carried out in FreeCAD FEM workbench.

Mechanical B.C.: fixed on inner bore.
Material: Steel C45
FreeCAD Options:
Solver CCX Standard
Mesh Netgen optimized
(not second order)
Simulation results are eigenvalues : forms and frequencies

Link to the video with descriptions here:
https://vimeo.com/1101246711

1. Step 1: Modal analysis steps

   Basic steps carried out in this demo are:

   0) Open part

   
   

   1) Choose FreeCAD FEM Workbench

   
   

   2) create Analysis container

   
   

   3) apply material Steel C45

   
   

   4) Fixed constraint inner bore

   
   

   5) FEM Mesh from shape from Netgen (simplified)

   
   

   6) Select under Mechanical analysis type: frequency

   
   

   7) Write .inp Files und Run Solver 

   
   

   8) View Results: Eigenforms and frequencies

   
   

   Thanx!