Description

Class for a single 'point' node, that has 3 DOF degrees of freedom and a mass.

#include <ChNodeXYZ.h>

Inheritance diagram for chrono::ChNodeXYZ:

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Collaboration diagram for chrono::ChNodeXYZ:

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Public Member Functions
	ChNodeXYZ (const ChVector3d &initial_pos)

	ChNodeXYZ (const ChNodeXYZ &other)

ChNodeXYZ &	operator= (const ChNodeXYZ &other)

virtual ChVariablesNode &	Variables ()=0

const ChVector3d &	GetPos () const

void	SetPos (const ChVector3d &mpos)

const ChVector3d &	GetPosDt () const

void	SetPosDt (const ChVector3d &mposdt)

const ChVector3d &	GetPosDt2 () const

void	SetPosDt2 (const ChVector3d &mposdtdt)

virtual double	GetMass () const =0

virtual void	SetMass (double mm)=0

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

virtual unsigned int	GetLoadableNumCoordsPosLevel () override
	Gets the number of DOFs affected by this element (position part)

virtual unsigned int	GetLoadableNumCoordsVelLevel () override
	Gets the number of DOFs affected by this element (speed part)

virtual void	LoadableGetStateBlockPosLevel (int block_offset, ChState &mD) override
	Gets all the DOFs packed in a single vector (position part)

virtual void	LoadableGetStateBlockVelLevel (int block_offset, ChStateDelta &mD) override
	Gets all the DOFs packed in a single vector (speed part)

virtual void	LoadableStateIncrement (const unsigned int off_x, ChState &x_new, const ChState &x, const unsigned int off_v, const ChStateDelta &Dv) override
	Increment all DOFs using a delta.

virtual unsigned int	GetNumFieldCoords () override
	Number of coordinates in the interpolated field, ex=3 for a tetrahedron finite element or a cable, etc. More...

virtual unsigned int	GetNumSubBlocks () override
	Get the number of DOFs sub-blocks.

virtual unsigned int	GetSubBlockOffset (unsigned int nblock) override
	Get the offset of the specified sub-block of DOFs in global vector.

virtual unsigned int	GetSubBlockSize (unsigned int nblock) override
	Get the size of the specified sub-block of DOFs in global vector.

virtual bool	IsSubBlockActive (unsigned int nblock) const override
	Check if the specified sub-block of DOFs is active.

virtual void	LoadableGetVariables (std::vector< ChVariables * > &mvars) override
	Get the pointers to the contained ChVariables, appending to the mvars vector.

virtual void	ComputeNF (const double U, const double V, const double W, ChVectorDynamic<> &Qi, double &detJ, const ChVectorDynamic<> &F, ChVectorDynamic<> state_x, ChVectorDynamic<> state_w) override
	Evaluate Q=N'*F , for Q generalized lagrangian load, where N is some type of matrix evaluated at point P(U,V,W) assumed in absolute coordinates, and F is a load assumed in absolute coordinates. More...

virtual double	GetDensity () override
	This is not needed because not used in quadrature.

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.

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

ChNodeBase &	operator= (const ChNodeBase &other)

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

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).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Public Member Functions inherited from chrono::ChLoadableUVW
virtual bool	IsTetrahedronIntegrationNeeded ()
	If true, use quadrature over u,v,w in [0..1] range as tetrahedron volumetric coords (with z=1-u-v-w) otherwise use default quadrature over u,v,w in [-1..+1] as box isoparametric coords.

virtual bool	IsTrianglePrismIntegrationNeeded ()
	If true, use quadrature over u,v in [0..1] range as triangle natural coords (with z=1-u-v), and use linear quadrature over w in [-1..+1], otherwise use default quadrature over u,v,w in [-1..+1] as box isoparametric coords.

Public Attributes
ChVector3d	pos

ChVector3d	pos_dt

ChVector3d	pos_dtdt

Additional Inherited Members
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)

Member Function Documentation

◆ ComputeNF()

void chrono::ChNodeXYZ::ComputeNF	(	const double	U,
		const double	V,
		const double	W,
		ChVectorDynamic<> &	Qi,
		double &	detJ,
		const ChVectorDynamic<> &	F,
		ChVectorDynamic<> *	state_x,
		ChVectorDynamic<> *	state_w
	)

overridevirtual

Evaluate Q=N'*F , for Q generalized lagrangian load, where N is some type of matrix evaluated at point P(U,V,W) assumed in absolute coordinates, and F is a load assumed in absolute coordinates.

The det[J] is unused.

Parameters

U	x coordinate of application point in absolute space
V	y coordinate of application point in absolute space
W	z coordinate of application point in absolute space
Qi	Return result of N'*F here, maybe with offset block_offset
detJ	Return det[J] here
F	Input F vector, size is 3, it is Force x,y,z in absolute coords.
state_x	if != 0, update state (pos. part) to this, then evaluate Q
state_w	if != 0, update state (speed part) to this, then evaluate Q

Implements chrono::ChLoadableUVW.

Reimplemented in chrono::fea::ChNodeFEAxyzDDD, chrono::fea::ChNodeFEAxyzDD, and chrono::fea::ChNodeFEAxyzD.

◆ GetNumFieldCoords()

virtual unsigned int chrono::ChNodeXYZ::GetNumFieldCoords ( )

inlineoverridevirtual

Number of coordinates in the interpolated field, ex=3 for a tetrahedron finite element or a cable, etc.

Here is 6: xyz displ + xyz rots

Implements chrono::ChLoadable.

Reimplemented in chrono::fea::ChNodeFEAxyzDDD, chrono::fea::ChNodeFEAxyzDD, and chrono::fea::ChNodeFEAxyzD.

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

/builds/uwsbel/chrono/src/chrono/physics/ChNodeXYZ.h
/builds/uwsbel/chrono/src/chrono/physics/ChNodeXYZ.cpp

Description

Public Member Functions

Public Attributes

Additional Inherited Members

Member Function Documentation

◆ ComputeNF()

◆ GetNumFieldCoords()