chrono::ChShaftsGearbox Class Reference
Description
Class for defining a gearbox.
It defines a transmission ratio between two 1D entities of ChShaft type, and transmits the reaction of the gearbox to a 3D body that acts as the support truss. Note that the more basic ChShaftsGear can do the same, except that it does not provide a way to transmit reaction to a truss body. Also note that this can also be seen as a ChShaftPlanetary where one has joined the carrier shaft to a fixed body via a ChShaftBodyRotation constraint.
#include <ChShaftsGearbox.h>
Inheritance diagram for chrono::ChShaftsGearbox:
Collaboration diagram for chrono::ChShaftsGearbox:
Public Member Functions | |
| ChShaftsGearbox (const ChShaftsGearbox &other) | |
| virtual ChShaftsGearbox * | Clone () const override |
| "Virtual" copy constructor (covariant return type). | |
| ChShaft * | GetShaft1 () const |
| Get the first shaft (carrier wheel). | |
| ChShaft * | GetShaft2 () const |
| Get the second shaft. | |
| ChBodyFrame * | GetBodyTruss () const |
| Get the third shaft. | |
| void | SetTransmissionRatio (double t0) |
| Set the transmission ratio t, as in w2=t*w1, or t=w2/w1 , or t*w1 - w2 = 0. More... | |
| double | GetTransmissionRatio () const |
| Get the transmission ratio t, as in w2=t*w1, or t=w2/w1. More... | |
| void | SetShaftDirection (ChVector3d md) |
| Set the direction of the shaft with respect to 3D body, as a normalized vector expressed in the coordinates of the body. More... | |
| const ChVector3d & | GetShaftDirection () const |
| Get the direction of the shaft with respect to 3D body, as a normalized vector expressed in the coordinates of the body. | |
| double | GetReaction1 () const |
| Get the reaction torque considered as applied to the 1st axis. | |
| double | GetReaction2 () const |
| Get the reaction torque considered as applied to the 2nd axis. | |
| ChVector3d | GetTorqueReactionOnBody () const |
| Get the reaction torque considered as applied to the body (the truss of the gearbox), expressed in the coordinates of the body. | |
| bool | Initialize (std::shared_ptr< ChShaft > shaft_1, std::shared_ptr< ChShaft > shaft_2, std::shared_ptr< ChBodyFrame > truss, ChVector3d &dir) |
| Initialize this gearbox, given two shafts to join, and the 3D truss body. More... | |
| virtual void | ArchiveOut (ChArchiveOut &archive_out) override |
| Method to allow serialization of transient data to archives. | |
| virtual void | ArchiveIn (ChArchiveIn &archive_in) override |
| Method to allow deserialization of transient data from archives. | |
 Public Member Functions inherited from chrono::ChPhysicsItem | |
| ChPhysicsItem (const ChPhysicsItem &other) | |
| ChSystem * | GetSystem () const |
| Get the pointer to the parent ChSystem(). | |
| virtual void | SetSystem (ChSystem *m_system) |
| Set the pointer to the parent ChSystem(). More... | |
| void | AddVisualModel (std::shared_ptr< ChVisualModel > model) |
| Add an (optional) visualization model. More... | |
| std::shared_ptr< ChVisualModel > | GetVisualModel () const |
| Access the visualization model (if any). More... | |
| void | AddVisualShape (std::shared_ptr< ChVisualShape > shape, const ChFrame<> &frame=ChFrame<>()) |
| Add the specified visual shape to the visualization model. More... | |
| std::shared_ptr< ChVisualShape > | GetVisualShape (unsigned int i) const |
| Access the specified visualization shape in the visualization model (if any). More... | |
| void | AddVisualShapeFEA (std::shared_ptr< ChVisualShapeFEA > shapeFEA) |
| Add the specified FEA visualization object to the visualization model. More... | |
| std::shared_ptr< ChVisualShapeFEA > | GetVisualShapeFEA (unsigned int i) const |
| Access the specified FEA visualization object in the visualization model (if any). More... | |
| virtual ChFrame | GetVisualModelFrame (unsigned int nclone=0) const |
| Get the reference frame (expressed in and relative to the absolute frame) of the visual model. More... | |
| virtual unsigned int | GetNumVisualModelClones () const |
| Return the number of clones of the visual model associated with this physics item. More... | |
| void | AddCamera (std::shared_ptr< ChCamera > camera) |
| Attach a ChCamera to this physical item. More... | |
| std::vector< std::shared_ptr< ChCamera > > | GetCameras () const |
| Get the set of cameras attached to this physics item. | |
| virtual bool | IsActive () const |
| Return true if the object is active and included in dynamics. | |
| virtual bool | IsCollisionEnabled () const |
| Tell if the object is subject to collision. More... | |
| virtual void | AddCollisionModelsToSystem (ChCollisionSystem *coll_sys) const |
| Add to the provided collision system any collision models managed by this physics item. More... | |
| virtual void | RemoveCollisionModelsFromSystem (ChCollisionSystem *coll_sys) const |
| Remove from the provided collision system any collision models managed by this physics item. More... | |
| virtual void | SyncCollisionModels () |
| Synchronize the position and bounding box of any collsion models managed by this physics item. | |
| virtual ChAABB | GetTotalAABB () |
| Get the entire AABB axis-aligned bounding box of the object. More... | |
| virtual void | GetCenter (ChVector3d &mcenter) |
| Get a symbolic 'center' of the object. More... | |
| virtual void | Setup () |
| This might recompute the number of coordinates, DOFs, constraints, in case this might change (ex in ChAssembly), as well as state offsets of contained items (ex in ChMesh) | |
| virtual void | Update (bool update_assets=true) |
| As above, but does not require updating of time-dependent data. More... | |
| virtual void | ForceToRest () |
| Set zero speed (and zero accelerations) in state, without changing the position. More... | |
| virtual unsigned int | GetNumCoordsPosLevel () |
| Get the number of coordinates at the position level. More... | |
| virtual unsigned int | GetNumCoordsVelLevel () |
| Get the number of coordinates at the velocity level. More... | |
| virtual unsigned int | GetNumConstraints () |
| Get the number of scalar constraints. | |
| virtual unsigned int | GetNumConstraintsUnilateral () |
| Get the number of unilateral scalar constraints. | |
| unsigned int | GetOffset_x () |
| Get offset in the state vector (position part) | |
| unsigned int | GetOffset_w () |
| Get offset in the state vector (speed part) | |
| unsigned int | GetOffset_L () |
| Get offset in the lagrangian multipliers. | |
| void | SetOffset_x (const unsigned int moff) |
| Set offset in the state vector (position part) Note: only the ChSystem::Setup function should use this. | |
| void | SetOffset_w (const unsigned int moff) |
| Set offset in the state vector (speed part) Note: only the ChSystem::Setup function should use this. | |
| void | SetOffset_L (const unsigned int moff) |
| Set offset in the lagrangian multipliers Note: only the ChSystem::Setup function should use this. | |
| virtual void | IntStateGather (const unsigned int off_x, ChState &x, const unsigned int off_v, ChStateDelta &v, double &T) |
| From item's state to global state vectors y={x,v} pasting the states at the specified offsets. More... | |
| virtual void | IntStateScatter (const unsigned int off_x, const ChState &x, const unsigned int off_v, const ChStateDelta &v, const double T, bool full_update) |
| From global state vectors y={x,v} to item's state (and update) fetching the states at the specified offsets. More... | |
| virtual void | IntStateGatherAcceleration (const unsigned int off_a, ChStateDelta &a) |
| From item's state acceleration to global acceleration vector. More... | |
| virtual void | IntStateScatterAcceleration (const unsigned int off_a, const ChStateDelta &a) |
| From global acceleration vector to item's state acceleration. More... | |
| virtual void | IntStateIncrement (const unsigned int off_x, ChState &x_new, const ChState &x, const unsigned int off_v, const ChStateDelta &Dv) |
| Computes x_new = x + Dt , using vectors at specified offsets. More... | |
| virtual void | IntStateGetIncrement (const unsigned int off_x, const ChState &x_new, const ChState &x, const unsigned int off_v, ChStateDelta &Dv) |
| Computes Dt = x_new - x, using vectors at specified offsets. More... | |
| virtual void | IntLoadResidual_F (const unsigned int off, ChVectorDynamic<> &R, const double c) |
| Takes the F force term, scale and adds to R at given offset: R += c*F. More... | |
| virtual void | IntLoadResidual_Mv (const unsigned int off, ChVectorDynamic<> &R, const ChVectorDynamic<> &w, const double c) |
| Takes the M*v term, multiplying mass by a vector, scale and adds to R at given offset: R += c*M*w. More... | |
| virtual void | IntLoadLumpedMass_Md (const unsigned int off, ChVectorDynamic<> &Md, double &err, const double c) |
| Adds the lumped mass to a Md vector, representing a mass diagonal matrix. More... | |
| virtual void | IntLoadConstraint_Ct (const unsigned int off, ChVectorDynamic<> &Qc, const double c) |
| Takes the term Ct, scale and adds to Qc at given offset: Qc += c*Ct. More... | |
| virtual void | InjectVariables (ChSystemDescriptor &descriptor) |
| Register with the given system descriptor any ChVariable objects associated with this item. | |
| virtual void | InjectKRMMatrices (ChSystemDescriptor &descriptor) |
| Register with the given system descriptor any ChKRMBlock objects associated with this item. | |
| virtual void | LoadKRMMatrices (double Kfactor, double Rfactor, double Mfactor) |
| Compute and load current stiffnes (K), damping (R), and mass (M) matrices in encapsulated ChKRMBlock objects. More... | |
| virtual void | VariablesFbReset () |
| Sets the 'fb' part (the known term) of the encapsulated ChVariables to zero. | |
| virtual void | VariablesFbLoadForces (double factor=1) |
| Adds the current forces (applied to item) into the encapsulated ChVariables, in the 'fb' part: qf+=forces*factor. | |
| virtual void | VariablesQbLoadSpeed () |
| Initialize the 'qb' part of the ChVariables with the current value of speeds. More... | |
| virtual void | VariablesFbIncrementMq () |
| Adds M*q (masses multiplied current 'qb') to Fb, ex. More... | |
| virtual void | VariablesQbSetSpeed (double step=0) |
| Fetches the item speed (ex. More... | |
| virtual void | VariablesQbIncrementPosition (double step) |
| Increment item positions by the 'qb' part of the ChVariables, multiplied by a 'step' factor. More... | |
| virtual void | ConstraintsBiLoad_Ct (double factor=1) |
| Adds the current Ct (partial t-derivative, as in C_dt=0-> [Cq]*q_dt=-Ct) to the known term (b_i) of encapsulated ChConstraints. | |
| virtual void | ConstraintsBiLoad_Qc (double factor=1) |
| Adds the current Qc (the vector of C_dtdt=0 -> [Cq]*q_dtdt=Qc ) to the known term (b_i) of encapsulated ChConstraints. | |
| virtual void | ConstraintsFbLoadForces (double factor=1) |
| Adds the current link-forces, if any, (caused by springs, etc.) to the 'fb' vectors of the ChVariables referenced by encapsulated ChConstraints. | |
| Public Member Functions inherited from chrono::ChObj | |
| ChObj (const ChObj &other) | |
| int | GetIdentifier () const |
| Get the unique integer identifier of this object. More... | |
| void | SetTag (int tag) |
| Set an object integer tag (default: -1). More... | |
| int | GetTag () const |
| Get the tag of this object. | |
| void | SetName (const std::string &myname) |
| Set the name of this object. | |
| const std::string & | GetName () const |
| Get the name of this object. | |
| double | GetChTime () const |
| Gets the simulation time of this object. | |
| void | SetChTime (double m_time) |
| Sets the simulation time of this object. | |
| virtual std::string & | ArchiveContainerName () |
Additional Inherited Members | |
| Protected Member Functions inherited from chrono::ChObj | |
| int | GenerateUniqueIdentifier () |
| Protected Attributes inherited from chrono::ChPhysicsItem | |
| ChSystem * | system |
| parent system | |
| std::shared_ptr< ChVisualModelInstance > | vis_model_instance |
| instantiated visualization model | |
| std::vector< std::shared_ptr< ChCamera > > | cameras |
| set of cameras | |
| unsigned int | offset_x |
| offset in vector of state (position part) | |
| unsigned int | offset_w |
| offset in vector of state (speed part) | |
| unsigned int | offset_L |
| offset in vector of lagrangian multipliers | |
| Protected Attributes inherited from chrono::ChObj | |
| double | ChTime |
| object simulation time | |
| std::string | m_name |
| object name | |
| int | m_identifier |
| object unique identifier | |
| int | m_tag |
| user-supplied tag | |
Member Function Documentation
◆ GetTransmissionRatio()
|
inline |
Get the transmission ratio t, as in w2=t*w1, or t=w2/w1.
Also the t0 ordinary equivalent ratio of the inverted planetary, if the 3D body is rotating as in planetary gears.
◆ Initialize()
| bool chrono::ChShaftsGearbox::Initialize | ( | std::shared_ptr< ChShaft > | shaft_1, |
| std::shared_ptr< ChShaft > | shaft_2, | ||
| std::shared_ptr< ChBodyFrame > | truss, | ||
| ChVector3d & | dir | ||
| ) |
Initialize this gearbox, given two shafts to join, and the 3D truss body.
The truss receives the reaction torque of the gearbox. Direction is expressed in the local coordinates of the body. The shaft and body must belong to the same ChSystem.
- Parameters
-
shaft_1 first (input) shaft to join shaft_2 second (output) shaft to join truss truss body (also carrier, if rotating as in planetary gearboxes) dir the direction of the shaft on 3D body (applied on COM: pure torque)
◆ SetShaftDirection()
|
inline |
Set the direction of the shaft with respect to 3D body, as a normalized vector expressed in the coordinates of the body.
The shaft applies only torque, about this axis.
◆ SetTransmissionRatio()
| void chrono::ChShaftsGearbox::SetTransmissionRatio | ( | double | t0 | ) |
Set the transmission ratio t, as in w2=t*w1, or t=w2/w1 , or t*w1 - w2 = 0.
For example, t=1 for a rigid joint; t=-0.5 for representing a couple of spur gears with teeth z1=20 & z2=40; t=0.1 for a gear with inner teeth (or epicycloidal reducer), etc. Also the t0 ordinary equivalent ratio of the inverted planetary, if the 3D body is rotating as in planetary gears.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/physics/ChShaftsGearbox.h
- /builds/uwsbel/chrono/src/chrono/physics/ChShaftsGearbox.cpp
