# Difference between revisions of "Tire parameters"

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− | + | Example carparts/tire/touring | |

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<pre> | <pre> | ||

− | + | restitution = 0.1 | |

− | + | tread = 0.25 | |

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rolling-resistance = 1.3e-2, 6.5e-6 | rolling-resistance = 1.3e-2, 6.5e-6 | ||

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# Lateral force | # Lateral force | ||

− | a0=1. | + | a0=1.55 |

− | a1=- | + | a1=-55 |

− | a2= | + | a2=1750 |

− | a3= | + | a3=1900 |

− | a4= | + | a4=7.2 |

a5=0.014 | a5=0.014 | ||

a6=-0.24 | a6=-0.24 | ||

Line 200: | Line 21: | ||

a13=-2.4 | a13=-2.4 | ||

# Longitudinal force | # Longitudinal force | ||

− | b0=1. | + | b0=1.65 |

− | b1=- | + | b1=-110 |

− | b2= | + | b2=1800 |

b3=23.3 | b3=23.3 | ||

− | b4= | + | b4=410 |

− | b5=0 | + | b5=0.075 |

− | b6=0 | + | b6=0 |

b7=0.055 | b7=0.055 | ||

b8=-0.024 | b8=-0.024 | ||

b9=0.014 | b9=0.014 | ||

b10=0.26 | b10=0.26 | ||

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# Aligning moment | # Aligning moment | ||

− | c0=2. | + | c0=2.2 |

− | c1=-3 | + | c1=-4.3 |

− | c2=- | + | c2=-4.4 |

− | c3=-1. | + | c3=-1.9 |

− | c4=- | + | c4=-9.6 |

− | c5=0. | + | c5=0.0225 |

− | c6= | + | c6=0 |

c7=0.044 | c7=0.044 | ||

c8=-0.58 | c8=-0.58 | ||

Line 233: | Line 52: | ||

c17=-1.1 | c17=-1.1 | ||

</pre> | </pre> | ||

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+ | Restitution defines tire restitution(not implemented atm). The tread parameter ranges over arbitrary values of 0.0 to 1.0, where 0.0 is a road tire and 1.0 is an off-road tire. The two elements of rolling-resistance are the constant and velocity-squared terms, respectively. The longitudinal, transverse, and aligning section each contain a vector of “magic formula” coefficients as presented in Motor Vehicle Dynamics, Genta (1997). A description is shown below: | ||

<pre> | <pre> | ||

Shape factor ........................................... A0 | Shape factor ........................................... A0 | ||

Line 286: | Line 106: | ||

More information can be found at http://members.xoom.virgilio.it/adiaforo/epcjk.htm or if it's down try http://web.archive.org/web/20050913052226/http://members.xoom.virgilio.it/adiaforo/epcjk.htm | More information can be found at http://members.xoom.virgilio.it/adiaforo/epcjk.htm or if it's down try http://web.archive.org/web/20050913052226/http://members.xoom.virgilio.it/adiaforo/epcjk.htm | ||

− | + | There is a graphical tire parameters editor to adjust/review the parameters: http://svn.vdrift.net/viewvc.cgi | |

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## Revision as of 12:17, 30 June 2010

Example carparts/tire/touring

restitution = 0.1 tread = 0.25 rolling-resistance = 1.3e-2, 6.5e-6 # Lateral force a0=1.55 a1=-55 a2=1750 a3=1900 a4=7.2 a5=0.014 a6=-0.24 a7=1.0 a8=-0.03 a9=-0.0013 a10=-0.15 a111=-8.5 a112=-0.29 a12=17.8 a13=-2.4 # Longitudinal force b0=1.65 b1=-110 b2=1800 b3=23.3 b4=410 b5=0.075 b6=0 b7=0.055 b8=-0.024 b9=0.014 b10=0.26 # Aligning moment c0=2.2 c1=-4.3 c2=-4.4 c3=-1.9 c4=-9.6 c5=0.0225 c6=0 c7=0.044 c8=-0.58 c9=0.18 c10=0.043 c11=0.048 c12=-0.0035 c13=-0.18 c14=0.14 c15=-1.029 c16=0.27 c17=-1.1

Restitution defines tire restitution(not implemented atm). The tread parameter ranges over arbitrary values of 0.0 to 1.0, where 0.0 is a road tire and 1.0 is an off-road tire. The two elements of rolling-resistance are the constant and velocity-squared terms, respectively. The longitudinal, transverse, and aligning section each contain a vector of “magic formula” coefficients as presented in Motor Vehicle Dynamics, Genta (1997). A description is shown below:

Shape factor ........................................... A0 Load infl. on lat. friction coeff (*1000)... (1/kN) .... A1 Lateral friction coefficient at load = 0 (*1000) ....... A2 Maximum stiffness ........................ (N/deg) ..... A3 Load at maximum stiffness ................ (kN) ........ A4 Camber infiuence on stiffness ............ (%/deg/100) . A5 Curvature change with load ............................. A6 Curvature at load = 0 .................................. A7 Horizontal shift because of camber ........(deg/deg).... A8 Load influence on horizontal shift ........(deg/kN)..... A9 Horizontal shift at load = 0 ..............(deg)........ A10 Camber influence on vertical shift ........(N/deg/kN)... A111 Camber influence on vertical shift ........(N/deg/kN**2) A112 Load influence on vertical shift ..........(N/kN)....... A12 Vertical shift at load = 0 ................(N).......... A13 Shape factor ........................................... B0 Load infl. on long. friction coeff (*1000)... (1/kN) ... B1 Longitudinal friction coefficient at load = 0 (*1000)... B2 Curvature factor of stiffness ............ (N/%/kN**2) . B3 Change of stiffness with load at load = 0 (N/%/kN) ..... B4 Change of progressivity of stiffness/load (1/kN) ....... B5 Curvature change with load ............................. B6 Curvature change with load ............................. B7 Curvature at load = 0 .................................. B8 Load influence on horizontal shift ....... (%/kN) ...... B9 Horizontal shift at load = 0 ............. (%) ......... B10 Load influence on vertical shift ......... (N/kN) ...... B11 Vertical shift at load = 0 ............... (N) ......... B12 Shape factor ........................................... C0 Load influence of peak value ............ (Nm/kN**2) ... C1 Load influence of peak value ............ (Nm/kN) ...... C2 Curvature factor of stiffness ........... (Nm/deg/kN**2) C3 Change of stiffness with load at load = 0 (Nm/deg/kN) .. C4 Change of progressivity of stiffness/load (1/kN) ....... C5 Camber influence on stiffness ........... (%/deg/100) .. C6 Curvature change with load ............................. C7 Curvature change with load ............................. C8 Curvature at load = 0 .................................. C9 Camber influence of stiffness .......................... C10 Camber influence on horizontal shift......(deg/deg)..... C11 Load influence on horizontal shift........(deg/kN)...... C12 Horizontal shift at load = 0..............(deg)......... C13 Camber influence on vertical shift........(Nm/deg/kN**2) C14 Camber influence on vertical shift........(Nm/deg/kN)... C15 Load influence on vertical shift..........(Nm/kN)....... C16 Vertical shift at load = 0................(Nm).......... C17

More information can be found at http://members.xoom.virgilio.it/adiaforo/epcjk.htm or if it's down try http://web.archive.org/web/20050913052226/http://members.xoom.virgilio.it/adiaforo/epcjk.htm

There is a graphical tire parameters editor to adjust/review the parameters: http://svn.vdrift.net/viewvc.cgi