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Tire Models

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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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Notes

  1. 1.

    Actually, the formulation presented here of the brush model is quite general, and hence it is a bit involved.

  2. 2.

    For the very first time we look at the kinematics of points in the contact patch.

  3. 3.

    Not to be confused with the global friction coefficients (2.90) and (2.92).

  4. 4.

    The use of the practical slip \(\varvec{\kappa }\) would not have provided an equally neat formula.

  5. 5.

    The total time derivative is evaluated within \(\hat{{\mathsf {S}}}\), that is as if \(\,\mathbf {i}\) and \(\,\mathbf {j}\) were fixed.

  6. 6.

    As reported in [11, p. 4], this approach is actually due to d’Alembert.

  7. 7.

    In the brush model, \(\hat{y}\) is more a parameter than a variable.

  8. 8.

    More convenient governing equations for the sliding state are given in (11.59) and (11.60).

  9. 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. 10.

    Since the tangential force is constant in time, it is possible to exploit its dependence on the given slips.

  11. 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. 12.

    More generally, in tilting vehicles, which may have three wheels, like MP3 by Piaggio, or even four.

  13. 13.

    Of course, the effect cannot be to “add” the camber force, that is to translate the curve vertically.

  14. 14.

    The crucial aspects are: \(\mathbf {e}_s\) not depending on time, \(\mathbf {e}_a(\hat{x}_s,t)=\mathbf {e}_s(\hat{x}_s)\).

References

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Correspondence to Massimo Guiggiani .

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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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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-73219-0

  • Online ISBN: 978-3-319-73220-6

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