Difference between revisions of "Tire parameters"
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| − | Example '''carparts/tire/touring''' | + | Example from '''carparts/tire/touring''': |
| − | + | restitution = 0.1 | |
| − | restitution = 0.1 | + | tread = 0.25 |
| − | tread = 0.25 | + | rolling-resistance = 1.3e-2, 6.5e-6 |
| − | rolling-resistance = 1.3e-2, 6.5e-6 | + | # Lateral force |
| − | # Lateral force | + | a0=1.55 |
| − | a0=1.55 | + | a1=-55 |
| − | a1=-55 | + | a2=1750 |
| − | a2=1750 | + | a3=1900 |
| − | a3=1900 | + | a4=7.2 |
| − | a4=7.2 | + | a5=0.014 |
| − | a5=0.014 | + | a6=-0.24 |
| − | a6=-0.24 | + | a7=1.0 |
| − | a7=1.0 | + | a8=-0.03 |
| − | a8=-0.03 | + | a9=-0.0013 |
| − | a9=-0.0013 | + | a10=-0.15 |
| − | a10=-0.15 | + | a111=-8.5 |
| − | a111=-8.5 | + | a112=-0.29 |
| − | a112=-0.29 | + | a12=17.8 |
| − | a12=17.8 | + | a13=-2.4 |
| − | a13=-2.4 | + | # Longitudinal force |
| − | # Longitudinal force | + | b0=1.65 |
| − | b0=1.65 | + | b1=-110 |
| − | b1=-110 | + | b2=1800 |
| − | b2=1800 | + | b3=23.3 |
| − | b3=23.3 | + | b4=410 |
| − | b4=410 | + | b5=0.075 |
| − | 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 | + | # Aligning moment |
| − | # Aligning moment | + | c0=2.2 |
| − | c0=2.2 | + | c1=-4.3 |
| − | c1=-4.3 | + | c2=-4.4 |
| − | c2=-4.4 | + | c3=-1.9 |
| − | c3=-1.9 | + | c4=-9.6 |
| − | c4=-9.6 | + | c5=0.0225 |
| − | c5=0.0225 | + | c6=0 |
| − | c6=0 | + | c7=0.044 |
| − | c7=0.044 | + | c8=-0.58 |
| − | c8=-0.58 | + | c9=0.18 |
| − | c9=0.18 | + | c10=0.043 |
| − | c10=0.043 | + | c11=0.048 |
| − | c11=0.048 | + | c12=-0.0035 |
| − | c12=-0.0035 | + | c13=-0.18 |
| − | c13=-0.18 | + | c14=0.14 |
| − | c14=0.14 | + | c15=-1.029 |
| − | c15=-1.029 | + | c16=0.27 |
| − | c16=0.27 | + | c17=-1.1 |
| − | 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 | |
| − | 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: | + | Lateral friction coefficient at load = 0 (*1000) ....... A2 |
| − | + | Maximum stiffness ........................ (N/deg) ..... A3 | |
| − | Shape factor ........................................... A0 | + | Load at maximum stiffness ................ (kN) ........ A4 |
| − | Load infl. on lat. friction coeff (*1000)... (1/kN) .... A1 | + | Camber infiuence on stiffness ............ (%/deg/100) . A5 |
| − | Lateral friction coefficient at load = 0 (*1000) ....... A2 | + | Curvature change with load ............................. A6 |
| − | Maximum stiffness ........................ (N/deg) ..... A3 | + | Curvature at load = 0 .................................. A7 |
| − | Load at maximum stiffness ................ (kN) ........ A4 | + | Horizontal shift because of camber ........(deg/deg).... A8 |
| − | Camber infiuence on stiffness ............ (%/deg/100) . A5 | + | Load influence on horizontal shift ........(deg/kN)..... A9 |
| − | Curvature change with load ............................. A6 | + | Horizontal shift at load = 0 ..............(deg)........ A10 |
| − | Curvature at load = 0 .................................. A7 | + | Camber influence on vertical shift ........(N/deg/kN)... A111 |
| − | Horizontal shift because of camber ........(deg/deg).... A8 | + | Camber influence on vertical shift ........(N/deg/kN**2) A112 |
| − | Load influence on horizontal shift ........(deg/kN)..... A9 | + | Load influence on vertical shift ..........(N/kN)....... A12 |
| − | Horizontal shift at load = 0 ..............(deg)........ A10 | + | Vertical shift at load = 0 ................(N).......... A13 |
| − | Camber influence on vertical shift ........(N/deg/kN)... A111 | + | |
| − | Camber influence on vertical shift ........(N/deg/kN**2) A112 | + | Shape factor ........................................... B0 |
| − | Load influence on vertical shift ..........(N/kN)....... A12 | + | Load infl. on long. friction coeff (*1000)... (1/kN) ... B1 |
| − | Vertical shift at load = 0 ................(N).......... A13 | + | Longitudinal friction coefficient at load = 0 (*1000)... B2 |
| − | + | Curvature factor of stiffness ............ (N/%/kN**2) . B3 | |
| − | Shape factor ........................................... B0 | + | Change of stiffness with load at load = 0 (N/%/kN) ..... B4 |
| − | Load infl. on long. friction coeff (*1000)... (1/kN) ... B1 | + | Change of progressivity of stiffness/load (1/kN) ....... B5 |
| − | Longitudinal friction coefficient at load = 0 (*1000)... B2 | + | Curvature change with load ............................. B6 |
| − | Curvature factor of stiffness ............ (N/%/kN**2) . B3 | + | Curvature change with load ............................. B7 |
| − | Change of stiffness with load at load = 0 (N/%/kN) ..... B4 | + | Curvature at load = 0 .................................. B8 |
| − | Change of progressivity of stiffness/load (1/kN) ....... B5 | + | Load influence on horizontal shift ....... (%/kN) ...... B9 |
| − | Curvature change with load ............................. B6 | + | Horizontal shift at load = 0 ............. (%) ......... B10 |
| − | Curvature change with load ............................. B7 | + | Load influence on vertical shift ......... (N/kN) ...... B11 |
| − | Curvature at load = 0 .................................. B8 | + | Vertical shift at load = 0 ............... (N) ......... B12 |
| − | Load influence on horizontal shift ....... (%/kN) ...... B9 | + | |
| − | Horizontal shift at load = 0 ............. (%) ......... B10 | + | Shape factor ........................................... C0 |
| − | Load influence on vertical shift ......... (N/kN) ...... B11 | + | Load influence of peak value ............ (Nm/kN**2) ... C1 |
| − | Vertical shift at load = 0 ............... (N) ......... B12 | + | Load influence of peak value ............ (Nm/kN) ...... C2 |
| − | + | Curvature factor of stiffness ........... (Nm/deg/kN**2) C3 | |
| − | Shape factor ........................................... C0 | + | Change of stiffness with load at load = 0 (Nm/deg/kN) .. C4 |
| − | Load influence of peak value ............ (Nm/kN**2) ... C1 | + | Change of progressivity of stiffness/load (1/kN) ....... C5 |
| − | Load influence of peak value ............ (Nm/kN) ...... C2 | + | Camber influence on stiffness ........... (%/deg/100) .. C6 |
| − | Curvature factor of stiffness ........... (Nm/deg/kN**2) C3 | + | Curvature change with load ............................. C7 |
| − | Change of stiffness with load at load = 0 (Nm/deg/kN) .. C4 | + | Curvature change with load ............................. C8 |
| − | Change of progressivity of stiffness/load (1/kN) ....... C5 | + | Curvature at load = 0 .................................. C9 |
| − | Camber influence on stiffness ........... (%/deg/100) .. C6 | + | Camber influence of stiffness .......................... C10 |
| − | Curvature change with load ............................. C7 | + | Camber influence on horizontal shift......(deg/deg)..... C11 |
| − | Curvature change with load ............................. C8 | + | Load influence on horizontal shift........(deg/kN)...... C12 |
| − | Curvature at load = 0 .................................. C9 | + | Horizontal shift at load = 0..............(deg)......... C13 |
| − | Camber influence of stiffness .......................... C10 | + | Camber influence on vertical shift........(Nm/deg/kN**2) C14 |
| − | Camber influence on horizontal shift......(deg/deg)..... C11 | + | Camber influence on vertical shift........(Nm/deg/kN)... C15 |
| − | Load influence on horizontal shift........(deg/kN)...... C12 | + | Load influence on vertical shift..........(Nm/kN)....... C16 |
| − | Horizontal shift at load = 0..............(deg)......... C13 | + | Vertical shift at load = 0................(Nm).......... C17 |
| − | 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 | 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 | ||
Revision as of 08:42, 27 August 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
