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Weight of wheel
08-07-2010, 07:35 PM,
#1
Weight of wheel
Where is the weight of the wheel and unsprung part of suspension and brake?

Before:
Code:
[ wheel-FR ]
mass = 19
Reply
08-09-2010, 06:36 AM,
#2
 
It is calculated from tire dimensions. The densities are chosen to match real world tire/rim weight.

Code:
    // calculate wheel inertia/mass
    float tire_radius = tire.GetRadius();
    float tire_width = tire.GetSidewallWidth();
    float tire_thickness = 0.05;
    float tire_density = 8E3;
    
    float rim_radius = tire_radius - tire_width * tire.GetAspectRatio();
    float rim_width = tire_width;
    float rim_thickness = 0.01;
    float rim_density = 3E5;
    
    float tire_volume = tire_width * M_PI * tire_thickness * tire_thickness * (2 * tire_radius  - tire_thickness);
    float rim_volume = rim_width * M_PI * rim_thickness * rim_thickness * (2 * rim_radius - rim_thickness);
    float tire_mass = tire_density * tire_volume;
    float rim_mass = rim_density * rim_volume;
    float tire_inertia = tire_mass * tire_radius * tire_radius;
    float rim_inertia = rim_mass * rim_radius * rim_radius;
Reply
08-09-2010, 09:31 AM,
#3
 
NaN Wrote:It is calculated from tire dimensions. The densities are chosen to match real world tire/rim weight.
I didn´t follow the developers-discussion, but i worried about this result.
Not a good idea because:
- masses an inertia may vary between steel-wheels/normal tyre and cart wheels/slick and rally car or a formula car,
- the result of weight, inertia computation is completely intransparent (can´t add masses in .car-file to totalweight) and
- the unsprung parts of suspension/brakes are unconsidered!

Please allow:
Code:
[wheel-n]
mass = 20
inertia = 0.04
...as optional parameter. Not in 'wheel-n' defined parameter are computed!
Reply
08-10-2010, 04:51 AM,
#4
 
Added optional mass, inertia parameter to wheel declaration in rev 2847.

Quote:Not a good idea because:
- masses an inertia may vary between steel-wheels/normal tyre and cart wheels/slick and rally car or a formula car,
- the result of weight, inertia computation is completely intransparent (can´t add masses in .car-file to totalweight) and
- the unsprung parts of suspension/brakes are unconsidered!
I'd avoid adjustments of wheel properties to get a certain handling. You would tune for the current implementation. And it has its own load of issues (like low inertia values).

I guess you've got some real-world wheel, unsprung parts mass and inertia values?
Reply
08-10-2010, 05:31 PM,
#5
 
Sorry, too slow, to catch Trulli´s rear wheel with unsprung masses in Hockenheim, :-(
NaN Wrote:I guess you've got some real-world wheel, unsprung parts mass and inertia values?
Reply
08-11-2010, 07:36 AM,
#6
 
Try to be faster next time, hehe.
Reply


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