PxVehicleTireData Class Reference

#include <PxVehicleComponents.h>

Public Member Functions
	PxVehicleTireData ()
PX_FORCE_INLINE PxReal	getRecipLongitudinalStiffnessPerUnitGravity () const
	Return Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity. More...
PX_FORCE_INLINE PxReal	getFrictionVsSlipGraphRecipx1Minusx0 () const
	Return Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0]) More...
PX_FORCE_INLINE PxReal	getFrictionVsSlipGraphRecipx2Minusx1 () const
	Return Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0]) More...

Public Attributes
PxReal	mLatStiffX
	Tire lateral stiffness is a graph of tire load that has linear behavior near zero load and flattens at large loads. mLatStiffX describes the minimum normalized load (load/restLoad) that gives a flat lateral stiffness response to load. More...
PxReal	mLatStiffY
	Tire lateral stiffness is a graph of tire load that has linear behavior near zero load and flattens at large loads. mLatStiffY describes the maximum possible value of lateralStiffness/restLoad that occurs when (load/restLoad)>= mLatStiffX. More...
PxReal	mLongitudinalStiffnessPerUnitGravity
	Tire Longitudinal stiffness per unit gravitational acceleration. More...
PxReal	mCamberStiffnessPerUnitGravity
	tire Tire camber stiffness per unity gravitational acceleration. More...
PxReal	mFrictionVsSlipGraph [3][2]
	Graph of friction vs longitudinal slip with 3 points. More...
PxU32	mType
	Tire type denoting slicks, wets, snow, winter, summer, all-terrain, mud etc. More...

Private Member Functions
bool	isValid () const

Private Attributes
PxReal	mRecipLongitudinalStiffnessPerUnitGravity
	Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity. More...
PxReal	mFrictionVsSlipGraphRecipx1Minusx0
	Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0]) More...
PxReal	mFrictionVsSlipGraphRecipx2Minusx1
	Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0]) More...
PxReal	mPad [2]

Friends
class	PxVehicleWheels4SimData

Constructor & Destructor Documentation

PxVehicleTireData::PxVehicleTireData ( )

inline

Member Function Documentation

PX_FORCE_INLINE PxReal PxVehicleTireData::getFrictionVsSlipGraphRecipx1Minusx0 ( ) const

inline

Return Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0])

See Also

PxVehicleWheelsSimData::setTireData

PX_FORCE_INLINE PxReal PxVehicleTireData::getFrictionVsSlipGraphRecipx2Minusx1 ( ) const

inline

Return Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0])

See Also

PxVehicleWheelsSimData::setTireData

PX_FORCE_INLINE PxReal PxVehicleTireData::getRecipLongitudinalStiffnessPerUnitGravity ( ) const

inline

Return Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity.

See Also

PxVehicleWheelsSimData::setTireData

bool PxVehicleTireData::isValid ( ) const

private

Friends And Related Function Documentation

friend class PxVehicleWheels4SimData

friend

Member Data Documentation

PxReal PxVehicleTireData::mCamberStiffnessPerUnitGravity

tire Tire camber stiffness per unity gravitational acceleration.

Note

Camber stiffness of the tire is calculated as gravitationalAcceleration*mCamberStiffnessPerUnitGravity

Camber force can be approximated as gravitationalAcceleration*mCamberStiffnessPerUnitGravity*camberAngle.

Specified in kilograms per radian.

Range: [0, PX_MAX_F32)

PxReal PxVehicleTireData::mFrictionVsSlipGraph[3][2]

Graph of friction vs longitudinal slip with 3 points.

Note

mFrictionVsSlipGraph[0][0] is always zero.

mFrictionVsSlipGraph[0][1] is the friction available at zero longitudinal slip.

mFrictionVsSlipGraph[1][0] is the value of longitudinal slip with maximum friction.

mFrictionVsSlipGraph[1][1] is the maximum friction.

mFrictionVsSlipGraph[2][0] is the end point of the graph.

mFrictionVsSlipGraph[2][1] is the value of friction for slips greater than mFrictionVsSlipGraph[2][0].

The friction value computed from the friction vs longitudinal slip graph is used to scale the friction value for the combination of material and tire type (PxVehicleDrivableSurfaceToTireFrictionPairs).

mFrictionVsSlipGraph[2][0] > mFrictionVsSlipGraph[1][0] > mFrictionVsSlipGraph[0][0]

mFrictionVsSlipGraph[1][1] is typically greater than mFrictionVsSlipGraph[0][1]

mFrictionVsSlipGraph[2][1] is typically smaller than mFrictionVsSlipGraph[1][1]

longitudinal slips > mFrictionVsSlipGraph[2][0] use friction multiplier mFrictionVsSlipGraph[2][1]

The final friction value used by the tire model is the value returned by PxVehicleDrivableSurfaceToTireFrictionPairs multiplied by the value computed from mFrictionVsSlipGraph.

See Also

PxVehicleDrivableSurfaceToTireFrictionPairs, PxVehicleComputeTireForce

Range: [0, PX_MAX_F32)

PxReal PxVehicleTireData::mFrictionVsSlipGraphRecipx1Minusx0

private

Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0])

Note

Not necessary to set this value because it is set by PxVehicleWheelsSimData::setTireData

See Also

PxVehicleWheelsSimData::setTireData

PxReal PxVehicleTireData::mFrictionVsSlipGraphRecipx2Minusx1

private

Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0])

Note

Not necessary to set this value because it is set by PxVehicleWheelsSimData::setTireData

See Also

PxVehicleWheelsSimData::setTireData

PxReal PxVehicleTireData::mLatStiffX

Tire lateral stiffness is a graph of tire load that has linear behavior near zero load and flattens at large loads. mLatStiffX describes the minimum normalized load (load/restLoad) that gives a flat lateral stiffness response to load.

Range: [0, PX_MAX_F32)

PxReal PxVehicleTireData::mLatStiffY

Tire lateral stiffness is a graph of tire load that has linear behavior near zero load and flattens at large loads. mLatStiffY describes the maximum possible value of lateralStiffness/restLoad that occurs when (load/restLoad)>= mLatStiffX.

Note

If load/restLoad is greater than mLatStiffX then the lateral stiffness is mLatStiffY*restLoad.

If load/restLoad is less than mLatStiffX then the lateral stiffness is mLastStiffY*(load/mLatStiffX)

Lateral force can be approximated as lateralStiffness * lateralSlip.

Specified in per radian.

Range: [0, PX_MAX_F32)

PxReal PxVehicleTireData::mLongitudinalStiffnessPerUnitGravity

Tire Longitudinal stiffness per unit gravitational acceleration.

Note

Longitudinal stiffness of the tire is calculated as gravitationalAcceleration*mLongitudinalStiffnessPerUnitGravity.

Longitudinal force can be approximated as gravitationalAcceleration*mLongitudinalStiffnessPerUnitGravity*longitudinalSlip.

Specified in kilograms per radian.

Range: [0, PX_MAX_F32)

PxReal PxVehicleTireData::mPad[2]

private

PxReal PxVehicleTireData::mRecipLongitudinalStiffnessPerUnitGravity

private

Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity.

Note

Not necessary to set this value because it is set by PxVehicleWheelsSimData::setTireData

See Also

PxVehicleWheelsSimData::setTireData

PxU32 PxVehicleTireData::mType

Tire type denoting slicks, wets, snow, winter, summer, all-terrain, mud etc.

See Also

PxVehicleDrivableSurfaceToTireFrictionPairs

Range: [0, PX_MAX_F32)

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The documentation for this class was generated from the following file:

• PxVehicleComponents.h