Description

Load for a visco-elasto-plastic bushing acting between two bodies.

It uses three values for stiffness along the X Y Z axes of a coordinate system attached to the second body. This is equivalent to having a bushing with 3x3 diagonal local stiffness matrix. Also, it allows a very simple plasticity model, to cap the plastic force on x,y,z given three yelds.

#include <ChLoadsBody.h>

Inheritance diagram for chrono::ChLoadBodyBodyBushingPlastic:

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Collaboration diagram for chrono::ChLoadBodyBodyBushingPlastic:

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Public Member Functions
	ChLoadBodyBodyBushingPlastic (std::shared_ptr< ChBody > mbodyA, std::shared_ptr< ChBody > mbodyB, const ChFrame<> &abs_application, const ChVector<> &mstiffness, const ChVector<> &mdamping, const ChVector<> &myield)

void	SetYeld (const ChVector<> myeld)
	Set plastic yield, forces beyond this limit will be capped. More...

ChVector	GetYeld () const

ChVector	GetPlasticDeformation () const
	Get the current accumulated plastic deformation. More...

Public Member Functions inherited from chrono::ChLoadBodyBodyBushingSpherical
	ChLoadBodyBodyBushingSpherical (std::shared_ptr< ChBody > mbodyA, std::shared_ptr< ChBody > mbodyB, const ChFrame<> &abs_application, const ChVector<> &mstiffness, const ChVector<> &mdamping)

virtual ChLoadBodyBodyBushingSpherical *	Clone () const override
	"Virtual" copy constructor (covariant return type).

void	SetStiffness (const ChVector<> mstiffness)
	Set stiffness, along the x y z axes of loc_application_B, es [N/m].

ChVector	GetStiffness () const

void	SetDamping (const ChVector<> mdamping)
	Set damping, along the x y z axes of loc_application_B, es [Ns/m].

ChVector	GetDamping () const

Public Member Functions inherited from chrono::ChLoadBodyBody
	ChLoadBodyBody (std::shared_ptr< ChBody > bodyA, std::shared_ptr< ChBody > bodyB, const ChFrame<> &abs_application)

ChVector	GetForce () const
	For diagnosis purposes, this can return the actual last computed value of the applied force, expressed in coordinate system of loc_application_B, assumed applied to body B.

ChVector	GetTorque () const
	For diagnosis purposes, this can return the actual last computed value of the applied torque, expressed in coordinate system of loc_application_B, assumed applied to body B.

void	SetApplicationFrameA (const ChFrame<> &mpA)
	Set the application frame of bushing on bodyA.

ChFrame	GetApplicationFrameA () const

void	SetApplicationFrameB (const ChFrame<> &mpB)
	Set the application frame of bushing on bodyB.

ChFrame	GetApplicationFrameB () const

ChFrameMoving	GetAbsoluteFrameA () const
	Get absolute coordinate of frame A (last computed)

ChFrameMoving	GetAbsoluteFrameB () const
	Get absolute coordinate of frame B (last computed)

std::shared_ptr< ChBody >	GetBodyA () const

std::shared_ptr< ChBody >	GetBodyB () const

Public Member Functions inherited from chrono::ChLoadCustomMultiple
	ChLoadCustomMultiple (std::vector< std::shared_ptr< ChLoadable >> &mloadables)

	ChLoadCustomMultiple (std::shared_ptr< ChLoadable > mloadableA, std::shared_ptr< ChLoadable > mloadableB)

	ChLoadCustomMultiple (std::shared_ptr< ChLoadable > mloadableA, std::shared_ptr< ChLoadable > mloadableB, std::shared_ptr< ChLoadable > mloadableC)

virtual int	LoadGet_ndof_x () override
	Gets the number of DOFs affected by this load (position part)

virtual int	LoadGet_ndof_w () 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 (ex. More...

virtual int	LoadGet_field_ncoords () override
	Number of coordinates in the interpolated field, ex=3 for a tetrahedron finite element or a cable, = 1 for a thermal problem, etc.

virtual void	ComputeJacobian (ChState state_x, ChStateDelta state_w, ChMatrixRef mK, ChMatrixRef mR, ChMatrixRef mM) override
	Compute jacobians (default fallback). More...

virtual void	LoadIntLoadResidual_F (ChVectorDynamic<> &R, double c) override
	Adds the internal loads Q (pasted at global nodes offsets) into a global vector R, multiplied by a scaling factor c, as R += forces * c.

virtual void	LoadIntLoadResidual_Mv (ChVectorDynamic<> &R, const ChVectorDynamic<> &w, double c) override
	Default fallback: compute jacobians via ComputeJacobian(), then use M=-dQ/da to do R += cMw. More...

virtual void	CreateJacobianMatrices () override
	Create the jacobian loads if needed, and also set the ChVariables referenced by the sparse KRM block.

virtual ChVectorDynamic &	GetQ ()
	Access the generalized load vector Q.

Public Member Functions inherited from chrono::ChLoadBase
ChLoadJacobians *	GetJacobians ()
	Access the jacobians (if any, i.e. if this is a stiff load)

virtual void	Update (double time)
	Update: this is called at least at each time step. More...

virtual void	InjectKRMmatrices (ChSystemDescriptor &mdescriptor)
	Tell to a system descriptor that there are item(s) of type ChKblock in this object (for further passing it to a solver)

virtual void	KRMmatricesLoad (double Kfactor, double Rfactor, double Mfactor)
	Adds the current stiffness K and damping R and mass M matrices in encapsulated ChKblock item(s), if any. More...

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

int	GetIdentifier () const
	Gets the numerical identifier of the object.

void	SetIdentifier (int id)
	Sets the numerical identifier of the object.

double	GetChTime () const
	Gets the simulation time of this object.

void	SetChTime (double m_time)
	Sets the simulation time of this object.

const char *	GetName () const
	Gets the name of the object as C Ascii null-terminated string -for reading only!

void	SetName (const char myname[])
	Sets the name of this object, as ascii string.

std::string	GetNameString () const
	Gets the name of the object as C Ascii null-terminated string.

void	SetNameString (const std::string &myname)
	Sets the name of this object, as std::string.

void	MFlagsSetAllOFF (int &mflag)

void	MFlagsSetAllON (int &mflag)

void	MFlagSetON (int &mflag, int mask)

void	MFlagSetOFF (int &mflag, int mask)

int	MFlagGet (int &mflag, int mask)

virtual void	ArchiveOUT (ChArchiveOut &marchive)
	Method to allow serialization of transient data to archives.

virtual void	ArchiveIN (ChArchiveIn &marchive)
	Method to allow de-serialization of transient data from archives.

virtual std::string &	ArchiveContainerName ()

Protected Member Functions
virtual void	ComputeBodyBodyForceTorque (const ChFrameMoving<> &rel_AB, ChVector<> &loc_force, ChVector<> &loc_torque) override
	Implement the computation of the bushing force, in local coordinates of the loc_application_B. More...

Protected Member Functions inherited from chrono::ChLoadBodyBodyBushingSpherical
virtual bool	IsStiff () override
	Report if this is load is stiff. More...

Protected Member Functions inherited from chrono::ChLoadBodyBody
virtual void	ComputeQ (ChState state_x, ChStateDelta state_w) override
	Compute Q, the generalized load. More...

Protected Attributes
ChVector	yield

ChVector	plastic_def

Protected Attributes inherited from chrono::ChLoadBodyBodyBushingSpherical
ChVector	stiffness

ChVector	damping

Protected Attributes inherited from chrono::ChLoadBodyBody
ChFrame	loc_application_A
	application point on body A (local)

ChFrame	loc_application_B
	application point on body B (local)

ChVector	locB_force
	store computed values here

ChVector	locB_torque
	store computed values here

ChFrameMoving	frame_Aw
	for results

ChFrameMoving	frame_Bw
	for results

Protected Attributes inherited from chrono::ChLoadBase
ChLoadJacobians *	jacobians

Protected Attributes inherited from chrono::ChObj
double	ChTime
	the time of simulation for the object

Additional Inherited Members
Public Attributes inherited from chrono::ChLoadCustomMultiple
std::vector< std::shared_ptr< ChLoadable > >	loadables

ChVectorDynamic	load_Q

Constructor & Destructor Documentation

◆ ChLoadBodyBodyBushingPlastic()

chrono::ChLoadBodyBodyBushingPlastic::ChLoadBodyBodyBushingPlastic	(	std::shared_ptr< ChBody >	mbodyA,
		std::shared_ptr< ChBody >	mbodyB,
		const ChFrame<> &	abs_application,
		const ChVector<> &	mstiffness,
		const ChVector<> &	mdamping,
		const ChVector<> &	myield
	)

Parameters

mbodyA	body A
mbodyB	body B
abs_application	create the bushing here, in abs. coordinates.
mstiffness	stiffness, along the x y z axes of the abs_application
mdamping	damping, along the x y z axes of the abs_application
myield	plastic yield, along the x y z axes of the abs_application

Member Function Documentation

◆ ComputeBodyBodyForceTorque()

void chrono::ChLoadBodyBodyBushingPlastic::ComputeBodyBodyForceTorque	(	const ChFrameMoving<> &	rel_AB,
		ChVector<> &	loc_force,
		ChVector<> &	loc_torque
	)

overrideprotectedvirtual

Implement the computation of the bushing force, in local coordinates of the loc_application_B.

Force is assumed applied to loc_application_B of body B, and its opposite reaction to A.

Reimplemented from chrono::ChLoadBodyBodyBushingSpherical.

◆ GetPlasticDeformation()

ChVector chrono::ChLoadBodyBodyBushingPlastic::GetPlasticDeformation ( ) const

inline

Get the current accumulated plastic deformation.

This could become nonzero if forces went beyond the plastic yield.

◆ SetYeld()

void chrono::ChLoadBodyBodyBushingPlastic::SetYeld ( const ChVector<> myeld )

inline

Set plastic yield, forces beyond this limit will be capped.

Expressed along the x y z axes of loc_application_B.

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

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

Description

Public Member Functions

Protected Member Functions