Description

Generic finite element node with 9 degrees of freedom representing curvature.

#include <ChNodeFEAcurv.h>

Inheritance diagram for chrono::fea::ChNodeFEAcurv:

Collaboration diagram for chrono::fea::ChNodeFEAcurv:

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Public Member Functions
	ChNodeFEAcurv (const ChVector3d &rxx=VNULL, const ChVector3d &ryy=VNULL, const ChVector3d &rzz=VNULL)

	ChNodeFEAcurv (const ChNodeFEAcurv &other)

ChNodeFEAcurv &	operator= (const ChNodeFEAcurv &other)

void	SetCurvatureXX (const ChVector3d &rxx)
	Set the xx 2nd derivative of position vector.

const ChVector3d &	GetCurvatureXX () const
	Get the xx 2nd derivative of position vector.

void	SetCurvatureYY (const ChVector3d &ryy)
	Set the yy 2nd derivative of position vector.

const ChVector3d &	GetCurvatureYY () const
	Get the yy 2nd derivative of position vector.

void	SetCurvatureZZ (const ChVector3d &rzz)
	Set the zz 2nd derivative of position vector.

const ChVector3d &	GetCurvatureZZ () const
	Get the zz 2nd derivative of position vector.

void	SetCurvatureXX_dt (const ChVector3d &rxx_dt)
	Set the time derivative of the xx 2nd derivative of position vector.

const ChVector3d &	GetCurvatureXX_dt () const
	Get the time derivative of the xx 2nd derivative of position vector.

void	SetCurvatureYY_dt (const ChVector3d &ryy_dt)
	Set the time derivative of the yy 2nd derivative of position vector.

const ChVector3d &	GetCurvatureYY_dt () const
	Get the time derivative of the yy 2nd derivative of position vector.

void	SetCurvatureZZ_dt (const ChVector3d &rzz_dt)
	Set the time derivative of the zz 2nd derivative of position vector.

const ChVector3d &	GetCurvatureZZ_dt () const
	Get the time derivative of the zz 2nd derivative of position vector.

ChVectorDynamic &	GetMassDiagonal ()
	Get mass of the node. / TODO is this even meaningful/needed for this type of node?

void	SetMass (double mass)
	Set mass of the node. / TODO is this even meaningful/needed for this type of node?

ChVariables &	Variables ()

virtual void	Relax () override
	Reset the 2nd derivatives of position vector and their time derivatives.

virtual void	ForceToRest () override
	Reset to no speed and acceleration.

virtual void	SetFixed (bool fixed) override
	Fix/release this node. More...

virtual bool	IsFixed () const override
	Return true if the node is fixed (i.e., its state variables are not changed by the solver).

virtual unsigned int	GetNumCoordsPosLevel () const override
	Get the number of degrees of freedom.

virtual unsigned int	GetNumCoordsVelLevel () const override
	Get the number of degrees of freedom, derivative.

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 de-serialization of transient data from archives.

virtual void	NodeIntStateGather (const unsigned int off_x, ChState &x, const unsigned int off_v, ChStateDelta &v, double &T) override

virtual void	NodeIntStateScatter (const unsigned int off_x, const ChState &x, const unsigned int off_v, const ChStateDelta &v, const double T) override

virtual void	NodeIntStateGatherAcceleration (const unsigned int off_a, ChStateDelta &a) override

virtual void	NodeIntStateScatterAcceleration (const unsigned int off_a, const ChStateDelta &a) override

virtual void	NodeIntStateIncrement (const unsigned int off_x, ChState &x_new, const ChState &x, const unsigned int off_v, const ChStateDelta &Dv) override

virtual void	NodeIntStateGetIncrement (const unsigned int off_x, const ChState &x_new, const ChState &x, const unsigned int off_v, ChStateDelta &Dv) override

virtual void	NodeIntLoadResidual_F (const unsigned int off, ChVectorDynamic<> &R, const double c) override

virtual void	NodeIntLoadResidual_Mv (const unsigned int off, ChVectorDynamic<> &R, const ChVectorDynamic<> &w, const double c) override

virtual void	NodeIntLoadLumpedMass_Md (const unsigned int off, ChVectorDynamic<> &Md, double &error, const double c) override

virtual void	NodeIntToDescriptor (const unsigned int off_v, const ChStateDelta &v, const ChVectorDynamic<> &R) override

virtual void	NodeIntFromDescriptor (const unsigned int off_v, ChStateDelta &v) override

virtual void	InjectVariables (ChSystemDescriptor &descriptor) override
	Register with the given system descriptor any ChVariable objects associated with this item.

virtual void	VariablesFbReset () override
	Set the 'fb' part (the known term) of the encapsulated ChVariables to zero.

virtual void	VariablesFbLoadForces (double factor=1) override
	Add the current forces (applied to node) into the encapsulated ChVariables. More...

virtual void	VariablesQbLoadSpeed () override
	Initialize the 'qb' part of the ChVariables with the current value of speeds.

virtual void	VariablesQbSetSpeed (double step=0) override
	Fetch the item speed (ex. More...

virtual void	VariablesFbIncrementMq () override
	Add M*q (masses multiplied current 'qb') to Fb, ex. More...

virtual void	VariablesQbIncrementPosition (double step) override
	Increment node positions by the 'qb' part of the ChVariables, multiplied by a 'step' factor. More...

Public Member Functions inherited from chrono::fea::ChNodeFEAbase
virtual void	SetIndex (unsigned int mindex)
	Sets the global index of the node.

virtual unsigned int	GetIndex ()
	Gets the global index of the node.

virtual void	SetupInitial (ChSystem *system)
	Initial setup.

Public Member Functions inherited from chrono::ChNodeBase
	ChNodeBase (const ChNodeBase &other)

ChNodeBase &	operator= (const ChNodeBase &other)

virtual unsigned int	GetNumCoordsPosLevelActive () const
	Get the actual number of active degrees of freedom. More...

virtual unsigned int	GetNumCoordsVelLevelActive () const
	Get the actual number of active degrees of freedom, derivative. More...

virtual bool	IsAllCoordsActive () const
	Return true if all node DOFs are active (no node variable is fixed).

unsigned int	NodeGetOffsetPosLevel ()
	Get offset in the state vector (position part).

unsigned int	NodeGetOffsetVelLevel ()
	Get offset in the state vector (speed part).

void	NodeSetOffsetPosLevel (const unsigned int moff)
	Set offset in the state vector (position part).

void	NodeSetOffsetVelLevel (const unsigned int moff)
	Set offset in the state vector (speed part).

Protected Attributes
ChVariablesGenericDiagonalMass *	m_variables

ChVector3d	m_rxx

ChVector3d	m_ryy

ChVector3d	m_rzz

ChVector3d	m_rxx_dt

ChVector3d	m_ryy_dt

ChVector3d	m_rzz_dt

ChVector3d	m_rxx_dtdt

ChVector3d	m_ryy_dtdt

ChVector3d	m_rzz_dtdt

Protected Attributes inherited from chrono::fea::ChNodeFEAbase
unsigned int	g_index
	global node index

Protected Attributes inherited from chrono::ChNodeBase
unsigned int	offset_x
	offset in vector of state (position part)

unsigned int	offset_w
	offset in vector of state (speed part)

Additional Inherited Members
Public Attributes inherited from chrono::fea::ChNodeFEAbase
double	m_TotalMass
	Nodal mass obtained from element mass matrix.

Constructor & Destructor Documentation

◆ ChNodeFEAcurv()

chrono::fea::ChNodeFEAcurv::ChNodeFEAcurv	(	const ChVector3d &	rxx = `VNULL`,
		const ChVector3d &	ryy = `VNULL`,
		const ChVector3d &	rzz = `VNULL`
	)

Parameters

rxx	initial value of xx 2nd derivative of position vector
ryy	initial value of yy 2nd derivative of position vector
rzz	initial value of zz 2nd derivative of position vector

Member Function Documentation

◆ SetFixed()

void chrono::fea::ChNodeFEAcurv::SetFixed ( bool fixed )

overridevirtual

Fix/release this node.

If fixed, its state variables are not changed by the solver.

Implements chrono::fea::ChNodeFEAbase.

◆ VariablesFbIncrementMq()

void chrono::fea::ChNodeFEAcurv::VariablesFbIncrementMq ( )

overridevirtual

Add M*q (masses multiplied current 'qb') to Fb, ex.

if qb is initialized with v_old using VariablesQbLoadSpeed, this method can be used in timestepping schemes that do: M*v_new = M*v_old + forces*dt

Reimplemented from chrono::ChNodeBase.

◆ VariablesFbLoadForces()

void chrono::fea::ChNodeFEAcurv::VariablesFbLoadForces ( double factor = 1 )

overridevirtual

Add the current forces (applied to node) into the encapsulated ChVariables.

Include in the 'fb' part: qf+=forces*factor

Reimplemented from chrono::ChNodeBase.

◆ VariablesQbIncrementPosition()

void chrono::fea::ChNodeFEAcurv::VariablesQbIncrementPosition ( double step )

overridevirtual

Increment node positions by the 'qb' part of the ChVariables, multiplied by a 'step' factor.

pos+=qb*step If qb is a speed, this behaves like a single step of 1-st order numerical integration (Euler integration).

Reimplemented from chrono::ChNodeBase.

◆ VariablesQbSetSpeed()

void chrono::fea::ChNodeFEAcurv::VariablesQbSetSpeed ( double step = 0 )

overridevirtual

Fetch the item speed (ex.

linear velocity, in xyz nodes) from the 'qb' part of the ChVariables and sets it as the current item speed. If 'step' is not 0, also should compute the approximate acceleration of the item using backward differences, that is accel=(new_speed-old_speed)/step. Mostly used after the solver provided the solution in ChVariables.

Reimplemented from chrono::ChNodeBase.

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

/builds/uwsbel/chrono/src/chrono/fea/ChNodeFEAcurv.h
/builds/uwsbel/chrono/src/chrono/fea/ChNodeFEAcurv.cpp

Description

Public Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ ChNodeFEAcurv()

Member Function Documentation

◆ SetFixed()

◆ VariablesFbIncrementMq()

◆ VariablesFbLoadForces()

◆ VariablesQbIncrementPosition()

◆ VariablesQbSetSpeed()