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How to set contact force parameters?

pawel.kozlowski
I have a model of a vehicle with defined contact forces between tyres (toruses) and ground (a plane). The contact parameters are set in accordance with the suggestions in the table provided in the tech article (KB8019228) and initially the tyres are in contact with the plane . Currently I am facing two issues. The first one is that the solver cannot find a static equilibrium for my model due to the contact force equations which have the biggest error . And the second one is related with the calculated contact forces throughout a dynamic simulation. The contact forces are not continuos signals but rather set of spikes. And right now I am wondering if it is something which I should leave as it is or it is possible to modify the contact in such a way that it will behave in more continuous manner.
Could you recommend any approach how tackle those issues?
  • 0
    Yes, use a tire element instead of a torus. This has been discussed here many times before.
    Unless your wheel is actually a metal wheel without any deformation in the contact, you will NOT get good results using a solid-solid contact. It will not create realistic forces, neither vertically or horisontally.
    And if you have a metal wheel, you will get s spiky contact as ADAMS does discretize the geometries. There is a setting you can do to use exact geometries but that will be awfully slow. In that casse, you better look up which type of elements ADAMS does exact (analytical) contact for. I have used circles and planes in the past with good results (not to emulate tires but other applications).
     
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