Abstract
In this chapter a simple, yet significant, tire model is developed. It is basically a brush model, but with some noteworthy additions with respect to more common formulations. For instance, the model takes care of the transient phenomena that occur in the contact patch. A number of Figures show the pattern of the local actions within the contact patch.
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- 1.
Actually, the formulation presented here of the brush model is quite general, and hence it is a bit involved.
- 2.
For the very first time we look at the kinematics of points in the contact patch.
- 3.
- 4.
The use of the practical slip \(\varvec{\kappa }\) would not have provided an equally neat formula.
- 5.
The total time derivative is evaluated within \(\hat{{\mathsf {S}}}\), that is as if \(\,\mathbf {i}\) and \(\,\mathbf {j}\) were fixed.
- 6.
As reported in [11, p. 4], this approach is actually due to d’Alembert.
- 7.
In the brush model, \(\hat{y}\) is more a parameter than a variable.
- 8.
- 9.
The solution of \(y' + f(x) y = g(x)\) is
$$y(x) = \exp \left( -\int ^x f(t) \mathrm{d}t\right) \left[ \int ^x \exp \left( \int ^z f(t) \mathrm{d}t\right) g(z) \mathrm{d}z + C \right] .$$ - 10.
Since the tangential force is constant in time, it is possible to exploit its dependence on the given slips.
- 11.
If, as usual, also \(\hat{x}_0(\hat{x},\hat{y}) = \hat{x}_0(\hat{x},-\hat{y})\) and \(p(\hat{x},\hat{y}) = p(\hat{x},-\hat{y})\).
- 12.
More generally, in tilting vehicles, which may have three wheels, like MP3 by Piaggio, or even four.
- 13.
Of course, the effect cannot be to “add” the camber force, that is to translate the curve vertically.
- 14.
The crucial aspects are: \(\mathbf {e}_s\) not depending on time, \(\mathbf {e}_a(\hat{x}_s,t)=\mathbf {e}_s(\hat{x}_s)\).
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Guiggiani, M. (2018). Tire Models. In: The Science of Vehicle Dynamics. Springer, Cham. https://doi.org/10.1007/978-3-319-73220-6_11
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DOI: https://doi.org/10.1007/978-3-319-73220-6_11
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