The Tire-Road Interaction (Magic Formula) block models the longitudinal forces at the tire-road contact patch using the Magic Formula of Pacejka. The figure displays the forces on the tire. The table defines the tire model variables. Most vehicle manufacturers use what is commonly known as Pacejka’s ‘Magic Formula’, the tire model developed and presented in this book Show less New edition of the definitive book on tire mechanics, by the acknowledged world authority on the topic.
The Pacejka / Magic Formula (MF) equations were conceived to fit the data gathered from experimental tests with real tires. The equations can then predict the behavior of each specific real tire with great precision. Real Pacejka/MF data sets are heavily protected intellectual property of the tire manufacturers. However, when used in video games where gameplay is important, the Pacejka curves can be fine tuned in a variety of ways in order to achieve the desired result. This guide explains how each parameter of the Pacejka ’94 specification affects the resulting curve, as well as the typical range for the values. Longitudinal Force Pacejka ’94 Longitudinal Force parameters: Parameter Role Units Typical range Sample b0 Shape factor 1.4.
1.8 1.5 b1 Load influence on longitudinal friction coefficient (.1000) 1/kN -80. +80 0 b2 Longitudinal friction coefficient (.1000) 900. 1700 1100 b3 Curvature factor of stiffness/load N/%/kN^2 -20. +20 0 b4 Change of stiffness with slip N/% 100.
500 300 b5 Change of progressivity of stiffness/load 1/kN -1. +1 0 b6 Curvature change with load^2 -0.1. +0.1 0 b7 Curvature change with load -1. +1 0 b8 Curvature factor -20. +1 -2 b9 Load influence on horizontal shift%/kN -1.
![]()
+1 0 b10 Horizontal shift% -5. +5 0 b11 Vertical shift N -100. +100 0 b12 Vertical shift at load = 0 N -10.
+10 0 b13 Curvature shift -1.
Comments are closed.
|
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |