PxVehicleTireData Class Reference
[Vehicle]

#include <PxVehicleComponents.h>

List of all members.

Public Member Functions
	PxVehicleTireData ()
PX_FORCE_INLINE PxReal	getRecipLongitudinalStiffnessPerUnitGravity () const
	Return Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity.
PX_FORCE_INLINE PxReal	getFrictionVsSlipGraphRecipx1Minusx0 () const
	Return Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0]).
PX_FORCE_INLINE PxReal	getFrictionVsSlipGraphRecipx2Minusx1 () const
	Return Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0]).
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.
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.
PxReal	mLongitudinalStiffnessPerUnitGravity
	Tire Longitudinal stiffness per unit gravitational acceleration.
PxReal	mCamberStiffnessPerUnitGravity
	tire Tire camber stiffness per unity gravitational acceleration.
PxReal	mFrictionVsSlipGraph [3][2]
	Graph of friction vs longitudinal slip with 3 points.
PxU32	mType
	Tire type denoting slicks, wets, snow, winter, summer, all-terrain, mud etc.
Private Member Functions
bool	isValid () const
Private Attributes
PxReal	mRecipLongitudinalStiffnessPerUnitGravity
	Cached value of 1.0/mLongitudinalStiffnessPerUnitGravity.
PxReal	mFrictionVsSlipGraphRecipx1Minusx0
	Cached value of 1.0f/(mFrictionVsSlipGraph[1][0]-mFrictionVsSlipGraph[0][0]).
PxReal	mFrictionVsSlipGraphRecipx2Minusx1
	Cached value of 1.0f/(mFrictionVsSlipGraph[2][0]-mFrictionVsSlipGraph[1][0]).
PxReal	mPad [2]
Friends
class	PxVehicleWheels4SimData

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Constructor & Destructor Documentation

PxVehicleTireData::PxVehicleTireData

(

)

[inline]

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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]

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Friends And Related Function Documentation

friend class PxVehicleWheels4SimData [friend]

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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