Simple multibody simulation/Fusion Simulation Extension

[david1992BH6XK]

Dear Autodesk Users,

unfortunately, Fusion alone does not have the possibility to perform simple multibody simulations (I tried HOTINT before, but 3D Modelling is too complex, why I switch to Autodesk), so I try out the simulation extension.

Could somebody provide me please with a simulation file, that simulates a simple cube on ground and a torque applied at a specified point? The solution should provide the answer if the dice (depending on mass, corner shape) tilts or not.

I would be very thankfull, as I am not a mechanical engineer (electrical instead), I have no experience in CAD/CAE and I want to use my 14 day trial for the simulation extension properly.

Kind Regards,

David

[kacper.suchomski]

Hi

It's difficult to comment on your situation without knowing the specifics.

Please share your current development files if you need help with further steps.

[david1992BH6XK]

Hello Kacper,

I would be happy already, if I could simulate how the cube falls due to gravity. Maybe later how it reacts when it falls on a surface. Am I right, that this is possible in Fusion + Simulation Extension, but for those taks MBS Tools like ADAMS and RecurDyn are more appropriate?

[TheCADWhisperer · Accepted solution]

@david1992BH6XK 

I would use Autodesk Inventor Professional - Dynamic Simulation for something like this.

https://youtu.be/kPNixMABFyc

[henderh · Accepted solution]

Hi @david1992BH6XK,

I agree 100% with @TheCADWhisperer for using Inventor Professional's Dynamic Simulation as the simulation tool instead. Additionally, it offers the Unknown Force / Torque 'Imposed motion' that may suit the setup well. Fusion Simulation's (and Inventor Professional's Stress Analysis) employ a Linear Static stress solver, which is limited to small deformations / displacements, and require a statically stable setup without open degrees of freedom that the FEM cannot solve. The setup you describe is more of a dynamic scenario, and should be able to be solved using the F=ma 'Newtonian physics' type solver. Ironically, some aspects of the analysis / calculations may be solved using a hand-calc static analysis employing a free body diagram, knowing the center of gravity coordinate, the 'tipping' contact point, and the perpendicular distance between those two (friction effects not included).

FWIW, when it comes to an applied torque / moment on a body, the location of the torque axis should have no effect on the moment load's effect on the body (i.e. the summation of moments about a point equals zero equation has no distance multiplier for moments, as it does for Force x perpendicular distance to the line of action).

Hope this helps! Please let us know if you have additional questions, comments, or suggestions.

Best regards,

[david1992BH6XK]

Thanks Mr Henderson and Suchomski. I got a trial license for RecurDyn student version and I am fascinated. In future, I will definitely look for Inventor too, as it is much cheaper and I have no big company.

Though, it is good to have a comparison and some experience with RecurDyn. I could answer my first questions with RecurDyn. Thanks for support, AutoDesk is making huge progress and Inventor can be my choice in future.

You can close this thread, thanks.