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Calspan
Calspan tire model used to determine the forces and moments developed at the tire contact patch
The Calspan tire model, which is used in the Iltis vehicle model described in reference [1], computes expressions for the lateral force and aligning moment. The longitudinal force, rolling resistance moment, and overturning moment are assumed to be zero.
Note: The  port of the Calspan component must be connected directly to the  port of a tire body component, as shown below.
Connections
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Name
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Description
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Color
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Tire reference frame, which must be connected to a tire body component.
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Gray
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Parameters
Note: All units are assumed to be in SI unless otherwise noted.
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Symbol
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Default
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Units
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Description
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ID
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![A[`0...4`]](/support/helpjp/helpview.aspx?si=3665/file09690/math163.png)
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![[2625, 14.47, 12930, 2.29, 18175]](/support/helpjp/helpview.aspx?si=3665/file09690/math166.png)
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-
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Lateral force coefficients
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A0A4
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![`AΩ`[t]](/support/helpjp/helpview.aspx?si=3665/file09690/math179.png)
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-
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Lateral force coefficient
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AWt
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![B[`1...4`]](/support/helpjp/helpview.aspx?si=3665/file09690/math195.png)
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![[-0.464e-4, 0, 1.216, 2.18*10^(-11)]](/support/helpjp/helpview.aspx?si=3665/file09690/math198.png)
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-
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Friction coefficients
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B1B4
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-
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Skid number ratio
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SN
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![AF[`1...4`]](/support/helpjp/helpview.aspx?si=3665/file09690/math227.png)
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![[-0.171e-4, -0.171e-4, 0]](/support/helpjp/helpview.aspx?si=3665/file09690/math230.png)
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-
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Friction coefficients
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AF1AF3
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References
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1
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"The Iltis Benchmark Problem Definition", in Multibody Computer Codes in Vehicle System Dynamics, W. Kortum and R. Sharp, editors, Supplement to the Vehicle System Dynamics journal, Vol.22, Swets and Zeitlinger, 1993, pp. 216-226.
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See Also
Linear, Fiala, Pacejka, User-defined, Standard Tire
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