Model Error

Vishrut Viradia
Vishrut Viradia Altair Community Member
edited October 2020 in Community Q&A

During Single lane change and constant radius analysis, my model is on front wheel and after some time the car pivots and runs on the rear wheels without the front wheels being in contact. Can anyone help me with this?

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Answers

  • Felipe M Leila
    Felipe M Leila New Altair Community Member
    edited August 2020

    Hi Vishrut,

    Probably the road reference marker is to high compared with the tire marker. Try to lower in Z the road reference marker a bit, 10, 20mm should work.

     

    Best regards,

    Felipe.

  • Chris Coker_21312
    Chris Coker_21312 New Altair Community Member
    edited August 2020

    I would recommend a crawl, walk, run approach to building your model.

     

    This also looks like it could be incorrect preloads in the springs, or incorrect sign convention for your shocks.  If you are using non-linear shock curve data, change your shocks back to a linear coefficient, and see if that resolves the issue.  If it does, you know you have a sign issue with the independent variable used for the shock data.

    Spring preloads are best checked with a half-vehicle model, using a static ride analysis, or K&C analysis.  Monitor the load on the tire patch at design position.  This load should be equal to the corner weight you expect to see on the tire.  If it doesn't match, then it is likely the preload (or free length) used to set up the spring is incorrect.

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