![]() ![]() There are currently two directly cited by ADAMS. ![]() Pacejka, the main proponent of the magic formula, and are named according to the age of their release. The Pacejka ’89 and ’94 tire models are named after Professor H. There are four main tire models using magic formula: Pacejka ’89, Pacejka ’94, MF-Tyre and MF-Swift. At low speed, you have a greater longitudinal slip and when you try to turn at the same time it feels awkward.This article combines the TR_rear_pac89.tir file in Adams to introduce the basic knowledge of the magic formula. This could also explain why so many sims struggle with low speed tyre physics. This would be because the longitudinal slip is trying to 'twist the tyre into a straight line'. If you try to get it twisted in the lateral direction at the same time, surely you should be having greater resistance (aligning moment). Surely, the aligning moment is not a function of slip angle alone, but of slip ratio too? If you have a tyre with a high slip ratio, it is twisted a bit in the longitudinal direction. The pacejka model for tyre behaviour consists of 4 curves - Tyre Longitudinal Force: Slip Ratio Tyre Lateral Force: Slip Angle Aligning Moment: Slip Angle Normalized Force: Slip Ratio My source: (Correct me if a part of the model is not described on that page) I think something is missing here. Quote from axus:Hi, Yes, its another mad physics discussion that I'm starting. I am also not sure if it is in other sims and I am not sure my claim is correct. Disclaimer: I do not know how the LFS model works at the moment, and as such I cannot know that this is not already in there. This should make for interesting discussion. I don't think I'll get enough force in there to twist the tyre significantly and I don't think I'll actually be able to calculate/estimate aligning moment. I have some tyres on rims lying around in there but I don't know where to start. Could we do an experiment in the garage/back yard to test this? You slide too much, because your slip angle is much higher than what it feels like it should be (I'm just guessing here). At low speed, you have a greater longitudinal slip and when you try to turn at the same time it feels awkward. If you have a tyre with a high slip ratio, it is twisted a bit in the longitudinal direction. The Pacejka / Magic Formula (MF) equations were conceived to fit the data gathered from experimental tests with real tires. ![]()
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