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GM_68896761-Visitor
1-Visitor
January 23, 2022
Question

Wheel to Ground Contact with Friction in Creo Mechanism

  • January 23, 2022
  • 2 replies
  • 2662 views

Hi All,

 

I'm trying to set up a rigid body dynamic analysis with creo mechanism, and I'm getting a little hung up on a wheel to ground contact.

 

I have a very simple wheel/axle similar to the one shown below. I would like to apply friction between the wheel and ground, and measure the force required to rotate the wheel/axle assembly around it's central axis (also shown below). Ideally I could measure this torque in two situations: 

1. The wheels are locked up/not allowed to rotate with respect to the axle. So pure friction between the wheel/ground interface.

2. The wheels are allowed to rotate (more realistic case).

 

Capture.JPG

 

I've been starting with case #1. I've tried a 3D contact between the wheel and ground. This seems to work for a kinematic simulation, but when I add friction the simulation errors out (no specific error message in the notification center).

My question: Would I be better off using a cam connection between the wheel and ground, or should the 3d Contact work for this application?

 

Thanks

2 replies

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
January 24, 2022

A rack and pinion connection between the wheel and ground can be used to simulate pure rolling.

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GM_68896761-VisitorAuthor
1-Visitor
January 27, 2022

Thanks @tbraxton. I did find that option before posting this, although I don't think it would work for my situation. I'm hoping to apply a force and  moment to the axle and predict the movement (combination of rolling and rotation about the axle center).

 

After a bit of reading I'm pretty sure I need to use the 3d contact. I'm still working on getting it to run correctly however.

S
SweetPeasHub17-Peridot
17-Peridot
January 31, 2022

Hi @GM_6889676 ,

Possible static redundancy? i.e. if one tire was very slightly larger than the other would they both touch?

Do you have gravity turned on to keep the tires in contact with the ground?

Are these realistic? Part mass, forces, timeframe to analyze?

If you don't have a material/mass assigned I don't believe there will be any feedback about the problem as it is not required that all parts have mass because they could be there for other reasons. It will just error out.

I think 3D contact is the correct method.

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