/u/GaryGiesel - (how) do you simulate these deformations and their knock-on effects? Can/do the n-post rigs replicate the lateral forces on the wheel assembly? Thanks!
To be honest this is a question best directed at a tyre expert - it’s one of those very detailed phenomena which certainly isn’t modelled in the relatively simple tyre models I’ve personally used, but I suspect the complicated physical models that the experts use may model this sort of dynamics.
Again, not an expert on ride or rig tests, but I don’t think you can really simulate this on a 7-post rig either. Not only do all the machines I’ve ever seen only apply vertical load, but more importantly in the rig tests you tend to use different tyres, which have a construction designed to mimic the vertical stiffness of a spinning tyre while stationary. (This sort of rig tyre is something that Pirelli supplies, along with things like wind tunnel tyres and show tyres)
TMeasy Version 6.0 actully does eigenmodes really well.
Version 6.0 an extension to the standard TMeasy version 5.3, takes the first two rigid body eigenmodes of the belt into consideration. These modes represent the in plane longitudinal and rotational movements of the belt relative to the rim. The dynamics of the longitudinal force is of higher order then and reproduces the tire wheel vibrations, required for indirect tire-pressure monitoring systems (iTPMS) of second generation
sufficiently well.
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u/carstuffaccount Apr 19 '21 edited Apr 20 '21
/u/GaryGiesel - (how) do you simulate these deformations and their knock-on effects? Can/do the n-post rigs replicate the lateral forces on the wheel assembly? Thanks!