Difference between revisions of "Tire parameters"

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Example '''carparts/tire/touring'''
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Example from '''carparts/tire/touring''':
<pre>
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restitution = 0.1
restitution = 0.1
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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
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b0=1.65
b0=1.65
+
b1=-110
b1=-110
+
b2=1800
b2=1800
+
b3=23.3
b3=23.3
+
b4=410
b4=410
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b5=0.075
b5=0.075
+
b6=0
b6=0
+
b7=0.055
b7=0.055
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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
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c0=2.2
c0=2.2
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c1=-4.3
c1=-4.3
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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:
</pre>
+
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
<pre>
+
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
 
</pre>
 
 
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
 
There is a graphical tire parameters editor to adjust/review the parameters: http://svn.vdrift.net/viewvc.cgi
 +
 +
[[Category:Cars]]
 +
[[Category:Files]]

Latest revision as of 04:17, 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