# Difference between revisions of "Tire parameters"

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− | + | Example from '''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 | |

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− | Vertical shift at load = 0................(Nm).......... C17 | ||

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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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− | + | [[Category:Cars]] | |

− | + | [[Category:Files]] | |

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## Latest revision as of 03:17, 1 September 2012

Example from **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