Description

Definition of a continuous band track assembly using an ANCFshell-based web A track assembly consists of a sprocket, an idler (with tensioner mechanism), a set of suspensions (road-wheel assemblies), and a collection of track shoes.

This class defines the template for a track assembly using a web modeled as an FEA mesh with ANCF shell elements.

#include <ChTrackAssemblyBandANCF.h>

Inheritance diagram for chrono::vehicle::ChTrackAssemblyBandANCF:
Collaboration diagram for chrono::vehicle::ChTrackAssemblyBandANCF:

Public Types

enum  ContactSurfaceType { NONE, NODE_CLOUD, TRIANGLE_MESH }
 Type of the mesh contact surface.
 

Public Member Functions

 ChTrackAssemblyBandANCF (const std::string &name, VehicleSide side)
 Construct an ANCFshell-based track assembly on the specified vehicle side. More...
 
virtual std::string GetTemplateName () const override
 Get the name of the vehicle subsystem template.
 
void SetContactSurfaceType (ContactSurfaceType type)
 Set the type of contact surface (default: TRIANGLE_MESH).
 
virtual size_t GetNumTrackShoes () const override
 Get the number of track shoes.
 
virtual std::shared_ptr< ChTrackShoeGetTrackShoe (size_t id) const override
 Get the specified track shoe subsystem.
 
std::shared_ptr< fea::ChMeshGetMesh () const
 Get the FEA mesh which contains all track shoe FEA elements in this assembly.
 
- Public Member Functions inherited from chrono::vehicle::ChTrackAssemblyBand
 ChTrackAssemblyBand (const std::string &name, VehicleSide side)
 
virtual std::shared_ptr< ChSprocketGetSprocket () const override
 Get a handle to the sprocket.
 
- Public Member Functions inherited from chrono::vehicle::ChTrackAssembly
VehicleSide GetVehicleSide () const
 Return the vehicle side for this track assembly.
 
size_t GetNumTrackSuspensions () const
 Get the number of suspensions.
 
size_t GetNumRollers () const
 Get the number of rollers.
 
std::shared_ptr< ChIdlerGetIdler () const
 Get a handle to the idler subsystem.
 
std::shared_ptr< ChTrackWheelGetIdlerWheel () const
 Get a handle to the idelr wheel subsystem.
 
std::shared_ptr< ChTrackBrakeGetBrake () const
 Get a handle to the brake subsystem.
 
const ChTrackSuspensionListGetTrackSuspensions () const
 Get the list of suspension subsystems.
 
std::shared_ptr< ChTrackSuspensionGetTrackSuspension (size_t id) const
 Get a handle to the specified suspension subsystem.
 
std::shared_ptr< ChTrackWheelGetRoller (size_t id) const
 Get a handle to the specified roller subsystem.
 
std::shared_ptr< ChTrackWheelGetRoadWheel (size_t id) const
 Get a handle to the specified road wheel subsystem.
 
const ChVector3dGetTrackShoePos (size_t id) const
 Get the global location of the specified track shoe. More...
 
const ChQuaternionGetTrackShoeRot (size_t id) const
 Get the orientation of the specified track shoe. More...
 
const ChVector3dGetTrackShoeLinVel (size_t id) const
 Get the linear velocity of the specified track shoe. More...
 
ChVector3d GetTrackShoeAngVel (size_t id) const
 Get the angular velocity of the specified track shoe. More...
 
ChVector3d GetTrackShoeTension (size_t id) const
 Get track tension at the specified track shoe. More...
 
BodyState GetTrackShoeState (size_t id) const
 Get the complete state for the specified track shoe. More...
 
void GetTrackShoeStates (BodyStates &states) const
 Get the complete states for all track shoes. More...
 
virtual const ChVector3d GetSprocketLocation () const =0
 Get the relative location of the sprocket subsystem. More...
 
virtual const ChVector3d GetIdlerLocation () const =0
 Get the relative location of the idler subsystem. More...
 
virtual const ChVector3d GetRoadWhelAssemblyLocation (int which) const =0
 Get the relative location of the specified suspension subsystem. More...
 
virtual const ChVector3d GetRollerLocation (int which) const
 Get the relative location of the specified roller subsystem. More...
 
void Initialize (std::shared_ptr< ChChassis > chassis, const ChVector3d &location, bool create_shoes=true)
 Initialize this track assembly subsystem. More...
 
double ReportTrackLength () const
 Return total assembled track length (sum of pitch over all track shoes).
 
ChTrackSuspension::ForceTorque ReportSuspensionForce (size_t id) const
 Return current suspension forces or torques, as appropriate (spring and shock) for the specified suspension. More...
 
void SetSprocketVisualizationType (VisualizationType vis)
 Set visualization type for the sprocket subsystem.
 
void SetIdlerVisualizationType (VisualizationType vis)
 
void SetSuspensionVisualizationType (VisualizationType vis)
 Set visualization type for the suspension subsystems.
 
void SetIdlerWheelVisualizationType (VisualizationType vis)
 Set visualization type for the idler-wheel subsystems.
 
void SetRoadWheelVisualizationType (VisualizationType vis)
 Set visualization type for the road-wheel subsystems.
 
void SetRollerVisualizationType (VisualizationType vis)
 Set visualization type for the roller subsystems.
 
void SetTrackShoeVisualizationType (VisualizationType vis)
 Set visualization type for the track shoe subsystems.
 
void SetWheelCollisionType (bool roadwheel_as_cylinder, bool idler_as_cylinder, bool roller_as_cylinder)
 Set collision shape type for wheels.
 
void Synchronize (double time, double braking)
 Update the state of this track assembly at the current time. More...
 
void Synchronize (double time, double braking, const TerrainForces &shoe_forces)
 Update the state of this track assembly at the current time. More...
 
virtual void SetOutput (bool state) override
 Enable/disable output for this subsystem. More...
 
void LogConstraintViolations ()
 Log current constraint violations.
 
bool IsRoadwheelCylinder () const
 
bool IsIdlerCylinder () const
 
bool IsRolerCylinder () const
 
- Public Member Functions inherited from chrono::vehicle::ChPart
const std::string & GetName () const
 Get the name identifier for this subsystem.
 
void SetName (const std::string &name)
 Set the name identifier for this subsystem.
 
bool IsInitialized () const
 Return flag indicating whether or not the part is fully constructed.
 
double GetMass () const
 Get the subsystem mass. More...
 
const ChFrameGetCOMFrame () const
 Get the current subsystem COM frame (relative to and expressed in the subsystem's reference frame). More...
 
const ChMatrix33GetInertia () const
 Get the current subsystem inertia (relative to the subsystem COM frame). More...
 
const ChFrameGetTransform () const
 Get the current subsystem position relative to the global frame. More...
 
void SetVisualizationType (VisualizationType vis)
 Set the visualization mode for this subsystem.
 
bool OutputEnabled () const
 Return the output state for this subsystem.
 

Protected Member Functions

void SetRubberLayerMaterial (double rho, const ChVector3d &E, const ChVector3d &nu, const ChVector3d &G)
 Set material properties of the rubber layers (isotropic material). More...
 
void SetSteelLayerMaterial (double rho, const ChVector3d &E, const ChVector3d &nu, const ChVector3d &G)
 Set material properties of the steel layer (isotropic material). More...
 
void SetElementStructuralDamping (double alpha)
 Set element structural damping (default: 0.05).
 
void SetLayerFiberAngles (double angle_1, double angle_2, double angle_3)
 Set fiber angle for the three layers. More...
 
virtual void CreateContactMaterial (ChContactMethod contact_method)=0
 Create the contact material for the web mesh, consistent with the specified contact method.
 
- Protected Member Functions inherited from chrono::vehicle::ChTrackAssemblyBand
bool FindAssemblyPoints (std::shared_ptr< ChBodyAuxRef > chassis, int num_shoes, const std::vector< double > &connection_lengths, std::vector< ChVector2d > &shoe_points)
 Assembly Algorithm Utility Functions.
 
void FindCircleTangentPoints (ChVector2d Circle1Pos, double Circle1Rad, ChVector2d Circle2Pos, double Circle2Rad, ChVector2d &Tan1Pnt1, ChVector2d &Tan1Pnt2, ChVector2d &Tan2Pnt1, ChVector2d &Tan2Pnt2)
 
void CheckCircleCircle (bool &found, ChVector2d &Point, ChMatrixDynamic<> &Features, int FeatureIdx, ChVector2d &StartingPoint, double Radius)
 
void CheckCircleLine (bool &found, ChVector2d &Point, ChMatrixDynamic<> &Features, int FeatureIdx, ChVector2d &StartingPoint, double Radius)
 
- Protected Member Functions inherited from chrono::vehicle::ChTrackAssembly
 ChTrackAssembly (const std::string &name, VehicleSide side)
 
virtual void InitializeInertiaProperties () override
 Initialize subsystem inertia properties. More...
 
virtual void UpdateInertiaProperties () override
 Update subsystem inertia properties. More...
 
virtual void ExportComponentList (rapidjson::Document &jsonDocument) const override
 Export this subsystem's component list to the specified JSON object. More...
 
virtual void Output (ChVehicleOutput &database) const override
 Output data for this subsystem's component list to the specified database.
 
- Protected Member Functions inherited from chrono::vehicle::ChPart
 ChPart (const std::string &name)
 Construct a vehicle subsystem with the specified name.
 
void AddMass (double &mass)
 Add this subsystem's mass. More...
 
void AddInertiaProperties (ChVector3d &com, ChMatrix33<> &inertia)
 Add this subsystem's inertia properties. More...
 
virtual void Create (const rapidjson::Document &d)
 Create a vehicle subsystem from JSON data. More...
 
void ExportBodyList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChBody >> bodies) const
 Export the list of bodies to the specified JSON document.
 
void ExportShaftList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChShaft >> shafts) const
 Export the list of shafts to the specified JSON document.
 
void ExportJointList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChLink >> joints) const
 Export the list of joints to the specified JSON document.
 
void ExportCouplesList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChShaftsCouple >> couples) const
 Export the list of shaft couples to the specified JSON document.
 
void ExportMarkerList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChMarker >> markers) const
 Export the list of markers to the specified JSON document.
 
void ExportLinSpringList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChLinkTSDA >> springs) const
 Export the list of translational springs to the specified JSON document.
 
void ExportRotSpringList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChLinkRSDA >> springs) const
 Export the list of rotational springs to the specified JSON document.
 
void ExportBodyLoadList (rapidjson::Document &jsonDocument, std::vector< std::shared_ptr< ChLoadBodyBody >> loads) const
 Export the list of body-body loads to the specified JSON document.
 

Protected Attributes

ChTrackShoeBandANCFList m_shoes
 track shoes
 
std::shared_ptr< fea::ChMeshm_track_mesh
 web mesh
 
std::shared_ptr< ChContactMaterialm_contact_material
 contact material for the web mesh
 
ContactSurfaceType m_contact_type
 type of contact surface model (node cloud or mesh)
 
- Protected Attributes inherited from chrono::vehicle::ChTrackAssemblyBand
std::shared_ptr< ChSprocketBandm_sprocket
 sprocket subsystem
 
double m_sprocket_offset
 
- Protected Attributes inherited from chrono::vehicle::ChTrackAssembly
VehicleSide m_side
 assembly on left/right vehicle side
 
ChVector3d m_rel_loc
 assembly location relative to chassis
 
std::shared_ptr< ChIdlerm_idler
 idler (and tensioner) subsystem
 
std::shared_ptr< ChTrackBrakem_brake
 sprocket brake
 
ChTrackSuspensionList m_suspensions
 road-wheel assemblies
 
ChTrackWheelList m_rollers
 roller subsystems
 
bool m_roadwheel_as_cylinder
 
bool m_idler_as_cylinder
 
bool m_roller_as_cylinder
 
std::vector< std::shared_ptr< ChLoadBodyForce > > m_shoe_terrain_forces
 terrain force loads on track shoes
 
std::vector< std::shared_ptr< ChLoadBodyTorque > > m_shoe_terrain_torques
 terrain torque loads on track shoes
 
- Protected Attributes inherited from chrono::vehicle::ChPart
std::string m_name
 subsystem name
 
bool m_initialized
 specifies whether ot not the part is fully constructed
 
bool m_output
 specifies whether or not output is generated for this subsystem
 
std::shared_ptr< ChPartm_parent
 parent subsystem (empty if parent is vehicle)
 
double m_mass
 subsystem mass
 
ChMatrix33 m_inertia
 inertia tensor (relative to subsystem COM)
 
ChFrame m_com
 COM frame (relative to subsystem reference frame)
 
ChFrame m_xform
 subsystem frame expressed in the global frame
 

Friends

class BroadphaseCulling
 

Additional Inherited Members

- Static Public Member Functions inherited from chrono::vehicle::ChPart
static ChMatrix33 TransformInertiaMatrix (const ChVector3d &moments, const ChVector3d &products, const ChMatrix33<> &vehicle_rot, const ChMatrix33<> &body_rot)
 Utility function for transforming inertia tensors between centroidal frames. More...
 
- Static Protected Member Functions inherited from chrono::vehicle::ChPart
static void RemoveVisualizationAssets (std::shared_ptr< ChPhysicsItem > item)
 Erase all visual shapes from the visual model associated with the specified physics item (if any).
 
static void RemoveVisualizationAsset (std::shared_ptr< ChPhysicsItem > item, std::shared_ptr< ChVisualShape > shape)
 Erase the given shape from the visual model associated with the specified physics item (if any).
 

Constructor & Destructor Documentation

◆ ChTrackAssemblyBandANCF()

chrono::vehicle::ChTrackAssemblyBandANCF::ChTrackAssemblyBandANCF ( const std::string &  name,
VehicleSide  side 
)

Construct an ANCFshell-based track assembly on the specified vehicle side.

Parameters
[in]namename of the subsystem
[in]sideassembly on left/right vehicle side

Member Function Documentation

◆ SetLayerFiberAngles()

void chrono::vehicle::ChTrackAssemblyBandANCF::SetLayerFiberAngles ( double  angle_1,
double  angle_2,
double  angle_3 
)
protected

Set fiber angle for the three layers.

Parameters
angle_1fiber angle for bottom (outter) rubber layer (default: 0 rad)
angle_2fiber angle for middle steel layer (default: 0 rad)
angle_3fiber angle for top (inner) rubber layer (default: 0 rad)

◆ SetRubberLayerMaterial()

void chrono::vehicle::ChTrackAssemblyBandANCF::SetRubberLayerMaterial ( double  rho,
const ChVector3d E,
const ChVector3d nu,
const ChVector3d G 
)
protected

Set material properties of the rubber layers (isotropic material).

Parameters
rhodensity (default: 1100)
Eelasticity moduli, E_x, E_y, E_z (default: 1e7)
nuPoisson ratios, nu_x, nu_y, nu_z (default: 0.49)
Gshear moduli, G_x, Gy, Gz (default: 0.5 * E / (1 + nu))

◆ SetSteelLayerMaterial()

void chrono::vehicle::ChTrackAssemblyBandANCF::SetSteelLayerMaterial ( double  rho,
const ChVector3d E,
const ChVector3d nu,
const ChVector3d G 
)
protected

Set material properties of the steel layer (isotropic material).

Parameters
rhodensity (default: 1100)
Eelasticity moduli, E_x, E_y, E_z (default: 1e7)
nuPoisson ratios, nu_x, nu_y, nu_z (default: 0.3)
Gshear moduli, G_x, Gy, Gz (default: 0.5 * E / (1 + nu))

The documentation for this class was generated from the following files:
  • /builds/uwsbel/chrono/src/chrono_vehicle/tracked_vehicle/track_assembly/ChTrackAssemblyBandANCF.h
  • /builds/uwsbel/chrono/src/chrono_vehicle/tracked_vehicle/track_assembly/ChTrackAssemblyBandANCF.cpp