Tire parameters - Revision history

Timo 6: Update categories

2012-09-01T11:17:36Z

Update categories

Timo 6: Formatting style updates

2012-08-27T16:42:15Z

Formatting style updates

Timo 6: 8 revisions: Import from old wiki (on 15 May 2012)

2012-08-26T17:28:38Z

8 revisions: Import from old wiki (on 15 May 2012)

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Example '''carparts/tire/touring'''
<pre>
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
</pre>

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
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
</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

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

[[Category:Cars]]
[[Category:Files]]
[[Category:Reformat]]

NaN at 19:27, 30 June 2010

2010-06-30T19:27:21Z

NaN at 19:17, 30 June 2010

2010-06-30T19:17:16Z

Show changes

NaN: Car parameters moved to Tire parameters: Tire parameters article

2010-06-30T19:05:13Z

Car parameters moved to Tire parameters: Tire parameters article

NaN at 18:58, 30 June 2010

2010-06-30T18:58:19Z

NaN at 18:12, 30 June 2010

2010-06-30T18:12:13Z

NaN at 18:00, 30 June 2010

2010-06-30T18:00:14Z

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NaN: Car parameters moved to Car parameters(old): Car parameters update

2010-06-30T17:57:15Z

Car parameters moved to Car parameters(old): Car parameters update

New page

#REDIRECT [[Car parameters(old)]]

← Older revision		Revision as of 11:17, 1 September 2012
Line 105:		Line 105:
	[[Category:Cars]]		[[Category:Cars]]
	[[Category:Files]]		[[Category:Files]]
−	~~[[Category:Reformat]]~~

@@ Line 28: / Line 28: @@
 ==Engine==
 <pre>
 position = 0.86, 0.0, -0.21
 mass = 140.0
@@ Line 66: / Line 67: @@
 ==Clutch==
 <pre>
 sliding = 0.27
 radius = 0.15
@@ Line 75: / Line 77: @@
 ==Transmission==
 <pre>
 gears = 6
 gear-ratio-r = -2.8
@@ Line 89: / Line 92: @@
 ==Differential==
 <pre>
 final-drive = 4.100
 anti-slip = 600.0
@@ Line 98: / Line 102: @@
 ==Fuel tank==
 <pre>
-position = -0.8, -0.1, -0.26
+[fuel-tank]
 capacity = 0.0492
 volume = 0.0492
@@ Line 104: / Line 109: @@
 </pre>
 The fuel tank's position, the current volume of fuel and the density of the fuel affect the car's weight distribution. The capacity tag sets the maximum volume of fuel that the tank can hold. The initial volume is set with the volume tag. The density of the fuel is set with fuel-density.
 ==Suspension==
@@ Line 126: / Line 173: @@
 hinge = 0,0,0
 </pre>
 The hinge is the center of the wheel's path as the suspension moves. The location of the hinge is determined by suspension geometry, and may be outside of the car itself.
 Wheel alignment is set with the camber, caster, and toe tags. All angles are in degrees.
 ==Tire==
@@ Line 256: / Line 296: @@
 </pre>
 The bias parameter is the fraction of braking pressure applied to the front brakes (in the front brake section) or the rear brakes (in the rear brake section).  To make sense, the rear value should equal 1.0 minus the front value.  The maximum brake torque is calculated as friction * area * bias * max-pressure * radius.  Some fraction of this value is applied based on the brake pedal.
 ==Wheel==
 <pre>
 position = 1.14, 0.76, -0.47
@@ Line 287: / Line 304: @@
 restitution = 0.1
 </pre>
 ==Particle==
 <pre>
 mass = 30.0
-position = -1.28, 0.0, -0.36
+position = 0.0, -1.28, -0.36
 </pre>
-These values are used for weight distribution and rotational inertia.
+These values are used for weight distribution and rotational inertia. Up to 100 particles are supported. Most cars will use 6-10.

@@ Line 1: / Line 1: @@
 The units are all in [http://scienceworld.wolfram.com/physics/MKS.html MKS] (meters, kilograms, seconds). It might also help to read [http://www.miata.net/sport/Physics/ ''The Physics of Racing''] by Brian Beckman.
 For unit conversion you can go to: [http://www.sonar-equipment.com/useful_conversion_factors_table1_p00.htm ''This Site''].
@@ Line 264: / Line 266: @@
 The position determines driver model position. The view positions define 3D coordinates for camera placement.  The view-stiffness parameter defines the stiffness of the camera bounce effect, where 0.0 is a sports car and 1.0 is F1-ish.
-==Drag==
+==Aerodevice==
 <pre>
 position = 1.9, 0.0, 0.60
@@ Line 282: / Line 275: @@
 efficiency = 0.95
 </pre>
 Downforce can be added with wings. The amount of downforce is determined by the value in the lift-coefficient tag. If the lift coefficient is positive, upforce is generated. This is usually undesirable for cars. The efficiency determines how much drag is added as downforce increases. The surface-area is the surface area of the wing. This value is also used in the drag calculation.
@@ Line 299: / Line 294: @@
 position = -1.28, 0.0, -0.36
 </pre>
-These values are used for weight distribution and balance.
+These values are used for weight distribution and rotational inertia.

@@ Line 1: / Line 1: @@
-Example '''carparts/tire/touring'''
+Example from '''carparts/tire/touring''':
-<pre>
+ 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:
-</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
 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

← Older revision	Revision as of 19:05, 30 June 2010
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