chrono::fea::ChLoadXYZROTnodeForceAbsolute Class Reference

Description

Load representing a concentrated force acting on a ChNodeXYZ, as a constant force, or it provides a function to modulate it with time.

As it is constant in space, IsStiff() is false, as default.

#include <ChLoadsXYZROTnode.h>

Inheritance diagram for chrono::fea::ChLoadXYZROTnodeForceAbsolute:
Collaboration diagram for chrono::fea::ChLoadXYZROTnodeForceAbsolute:

Public Member Functions

 ChLoadXYZROTnodeForceAbsolute (std::shared_ptr< ChNodeFEAxyzrot > node, const ChVector3d &force)
 
virtual ChLoadXYZROTnodeForceAbsoluteClone () const override
 "Virtual" copy constructor (covariant return type).
 
virtual void ComputeForceTorque (const ChFrameMoving<> &node_frame_abs_pos_vel, ChVector3d &abs_force, ChVector3d &abs_torque) override
 Compute the force on the node, in absolute coordsystem, given absolute position and speed of node passed via node_frame_abs_pos_vel. More...
 
void SetForceBase (const ChVector3d &force)
 Set the applied force vector: it is assumed constant, unless a non-constant scaling time function is provided. More...
 
ChVector3d GetForce () const
 Return the current force vector (scaled by the current modulation value).
 
void SetModulationFunction (std::shared_ptr< ChFunction > modulation)
 Set modulation function. More...
 
- Public Member Functions inherited from chrono::fea::ChLoadXYZROTnode
 ChLoadXYZROTnode (std::shared_ptr< ChNodeFEAxyzrot > body)
 
virtual void ComputeQ (ChState *state_x, ChStateDelta *state_w) override
 Compute Q, the generalized load. More...
 
ChVector3d GetForce () const
 For diagnosis purposes, this can return the actual last computed value of the applied force, expressed in absolute coordinate system, assumed applied to node.
 
ChVector3d GetTorque () const
 For diagnosis purposes, this can return the actual last computed value of the applied torque, expressed in absolute coordinate system, assumed applied to node.
 
- Public Member Functions inherited from chrono::ChLoadCustom
 ChLoadCustom (std::shared_ptr< ChLoadable > loadable_object)
 
virtual int LoadGetNumCoordsPosLevel () override
 Gets the number of DOFs affected by this load (position part).
 
virtual int LoadGetNumCoordsVelLevel () override
 Gets the number of DOFs affected by this load (speed part).
 
virtual void LoadGetStateBlock_x (ChState &mD) override
 Gets all the current DOFs packed in a single vector (position part).
 
virtual void LoadGetStateBlock_w (ChStateDelta &mD) override
 Gets all the current DOFs packed in a single vector (speed part).
 
virtual void LoadStateIncrement (const ChState &x, const ChStateDelta &dw, ChState &x_new) override
 Increment a packed state (e.g., as obtained by LoadGetStateBlock_x()) by a given packed state-delta. More...
 
virtual int LoadGetNumFieldCoords () override
 Number of coordinates in the interpolated field. More...
 
virtual void ComputeJacobian (ChState *state_x, ChStateDelta *state_w) override
 Compute Jacobian matrices K=-dQ/dx, R=-dQ/dv, and M=-dQ/da. More...
 
virtual void LoadIntLoadResidual_F (ChVectorDynamic<> &R, double c) override
 Add the internal loads Q (pasted at global offsets) into a global vector R, multiplied by a scaling factor c. More...
 
virtual void LoadIntLoadResidual_Mv (ChVectorDynamic<> &R, const ChVectorDynamic<> &w, double c) override
 Increment a vector R with the matrix-vector product M*w, scaled by the factor c. More...
 
virtual void LoadIntLoadLumpedMass_Md (ChVectorDynamic<> &Md, double &err, const double c) override
 Add the lumped mass to an Md vector, representing a mass diagonal matrix. More...
 
virtual void CreateJacobianMatrices () override
 Create the Jacobian loads if needed and set the ChVariables referenced by the sparse KRM block.
 
virtual ChVectorDynamicGetQ ()
 Access the generalized load vector Q.
 
- Public Member Functions inherited from chrono::ChLoadBase
ChLoadJacobiansGetJacobians ()
 Access the Jacobians (if any, i.e. if this is a stiff load).
 
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...
 
- 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.
 
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 void ArchiveOut (ChArchiveOut &archive_out)
 Method to allow serialization of transient data to archives.
 
virtual void ArchiveIn (ChArchiveIn &archive_in)
 Method to allow de-serialization of transient data from archives.
 
virtual std::string & ArchiveContainerName ()
 

Protected Member Functions

virtual bool IsStiff () override
 Inherited classes could override this and return true, if the load benefits from a Jacobian when using implicit integrators.
 
virtual void Update (double time) override
 Update, called at least at each time step. More...
 
- Protected Member Functions inherited from chrono::ChObj
int GenerateUniqueIdentifier ()
 

Protected Attributes

ChVector3d m_force_base
 base force value
 
std::shared_ptr< ChFunctionm_modulation
 modulation function of time
 
double m_scale
 scaling factor (current modulation value)
 
- Protected Attributes inherited from chrono::fea::ChLoadXYZROTnode
ChVector3d computed_abs_force
 
ChVector3d computed_abs_torque
 
- Protected Attributes inherited from chrono::ChLoadBase
ChLoadJacobiansm_jacobians
 
- 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
 

Additional Inherited Members

- Public Attributes inherited from chrono::ChLoadCustom
std::shared_ptr< ChLoadableloadable
 
ChVectorDynamic load_Q
 

Constructor & Destructor Documentation

◆ ChLoadXYZROTnodeForceAbsolute()

chrono::fea::ChLoadXYZROTnodeForceAbsolute::ChLoadXYZROTnodeForceAbsolute ( std::shared_ptr< ChNodeFEAxyzrot node,
const ChVector3d force 
)
Parameters
nodenode to apply load to
forceapplied force in absolute coordsys

Member Function Documentation

◆ ComputeForceTorque()

void chrono::fea::ChLoadXYZROTnodeForceAbsolute::ComputeForceTorque ( const ChFrameMoving<> &  node_frame_abs_pos_vel,
ChVector3d abs_force,
ChVector3d abs_torque 
)
overridevirtual

Compute the force on the node, in absolute coordsystem, given absolute position and speed of node passed via node_frame_abs_pos_vel.

Compute the force on the node, in absolute coordsystem, given position of node as abs_pos.

Implements chrono::fea::ChLoadXYZROTnode.

◆ SetForceBase()

void chrono::fea::ChLoadXYZROTnodeForceAbsolute::SetForceBase ( const ChVector3d force)

Set the applied force vector: it is assumed constant, unless a non-constant scaling time function is provided.

It is expressed in absolute coordinates.

◆ SetModulationFunction()

void chrono::fea::ChLoadXYZROTnodeForceAbsolute::SetModulationFunction ( std::shared_ptr< ChFunction modulation)
inline

Set modulation function.

This is a function of time which (optionally) modulates the specified applied force. By default the modulation is a constant function, always returning a value of 1.

◆ Update()

void chrono::fea::ChLoadXYZROTnodeForceAbsolute::Update ( double  time)
overrideprotectedvirtual

Update, called at least at each time step.

  • It recomputes the generalized load Q vector(s)
  • It recomputes the Jacobian matrices K,R,M in case of stiff load Q and Jacobians assumed evaluated at the current state. Jacobians are automatically allocated if needed.

Reimplemented from chrono::fea::ChLoadXYZROTnode.


The documentation for this class was generated from the following files:
  • /builds/uwsbel/chrono/src/chrono/fea/ChLoadsXYZROTnode.h
  • /builds/uwsbel/chrono/src/chrono/fea/ChLoadsXYZROTnode.cpp