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simuv4.1: change tire heating model for graining and heat curve to be dependent on initial atmospheric temp (allows for "Initial Temperature" to simulate tire warmers) 

git-svn-id: https://svn.code.sf.net/p/speed-dreams/code/trunk@9249 30fe4595-0a0c-4342-8851-515496e4dcbd
This commit is contained in:
harunasan 2024-01-17 04:47:30 +00:00
parent 2209103346
commit 2edbcd78ab
1 changed files with 17 additions and 6 deletions
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23
src/modules/simu/simuv4.1/wheel.cpp
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@ -911,9 +911,14 @@ void SimWheelUpdateTire(tCar *car, int index)
tdble lockMod = 0;
if (slipRatio < -0.9 && sqrt(car->airSpeed2) > 0)
//if (slipRatio < -0.9 && sqrt(car->airSpeed2) > 0)
if (slipRatio <= 1 && slipRatio > 0)
{
lockMod = ((fabs(wheel->tireSlip) * wheel->longHeatFactor) * 2500) * SimDeltaTime;
lockMod = (slipRatio) * (longForce) * fabs(wheelSpeed) * SimDeltaTime;
}
else if (slipRatio > 1)
{
lockMod = (1) * (longForce) * fabs(wheelSpeed) * 0.020 * SimDeltaTime;
}
// Calculate energy loss of the tire (convection, convection model approximation from papers,
@ -954,7 +959,7 @@ void SimWheelUpdateTire(tCar *car, int index)
wheel->Ttire -= ((wheel->coolingFactor) * (fabs(wheel->Ttire - Tair) * SimDeltaTime));
// Effect of temperature on live tire pressure
wheel->currentPressure = wheel->Ttire / wheel->Tinit * wheel->pressure;
wheel->currentPressure = wheel->Ttire / Tair * wheel->pressure;
// Wear
double deltaWear = (wheel->currentPressure - SimAirPressure) * slip * wheelSpeed * SimDeltaTime * normalForce
@ -965,7 +970,9 @@ void SimWheelUpdateTire(tCar *car, int index)
wheel->currentWear = 1.0f;
// Graining
tdble grainTemperature = (wheel->Topt - wheel->Tinit) * 3.0f / 4.0f + wheel->Tinit;
// Note that we use the TRACK temp and not the initial tire temp
// if the initial tire temp is higher (tire warmers, for example)
tdble grainTemperature = (wheel->Topt - Tair) * 3.0f / 4.0f + Tair;
tdble deltaGraining = (grainTemperature - wheel->Ttire) * deltaWear;
if (deltaGraining > 0.0f)
{
@ -984,9 +991,13 @@ void SimWheelUpdateTire(tCar *car, int index)
// Temperature window.
tdble di;
// Racing tires typically have a roughly 10-20C window
// where they achieve most of their optimal grip. This
// is a slightly simplified implementation.
if (wheel->Ttire < (wheel->Topt - 20))
{
di = (wheel->Ttire - wheel->Topt - 20) / (wheel->Topt - wheel->Tinit);
di = (wheel->Ttire - wheel->Topt - 20) / (wheel->Topt - Tair);
}
else if (wheel->Ttire <= wheel->Topt)
{
@ -994,7 +1005,7 @@ void SimWheelUpdateTire(tCar *car, int index)
}
else
{
di = (wheel->Ttire - wheel->Topt) / (wheel->Topt - wheel->Tinit);
di = (wheel->Ttire - wheel->Topt) / (wheel->Topt - Tair);
}
wheel->currentGripFactor = ((1.0f-(MIN((di*di), 1.0f)))/4.0f + 3.0f/4.0f) * (1.0f - wheel->currentGraining / 10.0f);