Jersey Tom wrote:Hasn't this been posted before? I know I've seen it.
Jersey Tom wrote:First things first... what do you mean by THE slip angle? Each tire will be at a different slip angle.
Jersey Tom wrote:Pretty simple solution in any event. At a given location in the corner, if you know the speed and path curvature you can get the lateral acceleration. If you know the lateral acceleration and mass of the front and rear halves of the car you can figure out how much force each axle needs to generate. If you know how much lateral force is required at each axle, and the Fy vs SA curve of each tire, you can arrive at the slip angles.
MadMatt wrote:Knowing the lateral force wouldn't be a problem because I know the tangential speed of the car and the corner radius. The problem is knowing the 3 steering angles. I know the angle at any point in the corner that the car HAS to follow otherwise he's leaving the track (I used 3 points in the corner to calculate this), but I don't know how to get those 3 steering angles.
As soon I as can get them, I know pretty much how to calculate the tire drag !
I have no map of the slip angle depending on the lateral force
Cα = (a30 + a31 P) sin (2 tan -1 (Fz / a40 + a41 P))
α = (m v2 / R )/(Cα - Cr Fz π/180)
a30, a31, a40 and a41 are coefficients given by Michelin, P is the tire pressure and Fz the load. Then when you get Cα, you can calculate the "real" α.
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