Description

Load for a visco-elastic translational/rotational bushing acting between two bodies.

It uses a full user-defined 6x6 matrix [K] to express the local stiffness of the bushing, assumed expressed in the bushing coordinate system attached to the second body. A user-defined 6x6 matrix [D] can be defined for damping, as well. Note that this assumes small rotations. Differently from the simpler ChLoadBodyBodyBushingMate and ChLoadBodyBodyBushingSpherical this can represent coupled effects, by using extra-diagonal terms in [K] and/or [D].

#include <ChLoadsBody.h>

Inheritance diagram for chrono::ChLoadBodyBodyBushingGeneric:

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Collaboration diagram for chrono::ChLoadBodyBodyBushingGeneric:

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Public Member Functions
	ChLoadBodyBodyBushingGeneric (std::shared_ptr< ChBody > bodyA, std::shared_ptr< ChBody > bodyB, const ChFrame<> &abs_application, const ChMatrix66d &stiffness66, const ChMatrix66d &damping66)

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

void	SetStiffnessMatrix (const ChMatrix66d &mstiffness)
	Set a generic 6x6 stiffness matrix, expressed in local coordinate system of loc_application_B.

const ChMatrix66d &	GetStiffnessMatrix () const

void	SetDampingMatrix (const ChMatrix66d &mdamping)
	Set a generic 6x6 damping matrix, expressed in local coordinate system of loc_application_B.

const ChMatrix66d &	GetDampingMatrix () const

void	SetNeutralForce (const ChVector3d mf)
	Set the initial pre-load of the bushing, applied to loc_application_A, expressed in local coordinate system of loc_application_B. More...

ChVector3d	GetNeutralForce () const

void	SetNeutralTorque (const ChVector3d mt)
	Set the initial pre-load torque of the bushing, applied to loc_application_A, expressed in local coordinate system of loc_application_B. More...

ChVector3d	GetNeutralTorque () const

ChFrame &	NeutralDisplacement ()
	Set/get the initial pre-displacement of the bushing, as the pre-displacement of A, expressed in local coordinate system of loc_application_B. More...

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

ChVector3d	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.

ChVector3d	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 >> &loadable_objects)

	ChLoadCustomMultiple (std::shared_ptr< ChLoadable > loadableA, std::shared_ptr< ChLoadable > loadableB)

	ChLoadCustomMultiple (std::shared_ptr< ChLoadable > loadableA, std::shared_ptr< ChLoadable > loadableB, std::shared_ptr< ChLoadable > loadableC)

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 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, called at least at each time step. More...

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.

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 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
	Report if this is load is stiff. More...

virtual void	ComputeBodyBodyForceTorque (const ChFrameMoving<> &rel_AB, ChVector3d &loc_force, ChVector3d &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::ChLoadBodyBody
virtual void	ComputeQ (ChState state_x, ChStateDelta state_w) override
	Compute the generalized load(s). More...

Protected Member Functions inherited from chrono::ChObj
int	GenerateUniqueIdentifier ()

Protected Attributes
ChMatrix66d	stiffness

ChMatrix66d	damping

ChVector3d	neutral_force

ChVector3d	neutral_torque

ChFrame	neutral_displacement

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)

ChVector3d	locB_force
	store computed values here

ChVector3d	locB_torque
	store computed values here

ChFrameMoving	frame_Aw
	for results

ChFrameMoving	frame_Bw
	for results

Protected Attributes inherited from chrono::ChLoadBase
ChLoadJacobians *	m_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::ChLoadCustomMultiple
std::vector< std::shared_ptr< ChLoadable > >	loadables

ChVectorDynamic	load_Q

Constructor & Destructor Documentation

◆ ChLoadBodyBodyBushingGeneric()

chrono::ChLoadBodyBodyBushingGeneric::ChLoadBodyBodyBushingGeneric	(	std::shared_ptr< ChBody >	bodyA,
		std::shared_ptr< ChBody >	bodyB,
		const ChFrame<> &	abs_application,
		const ChMatrix66d &	stiffness66,
		const ChMatrix66d &	damping66
	)

Parameters

bodyA	body A
bodyB	body B
abs_application	create the bushing here, in abs. coordinates.
stiffness66	stiffness as a 6x6 matrix, local in the abs_application frame
damping66	damping as a 6x6 matrix, local in the abs_application frame

Member Function Documentation

◆ ComputeBodyBodyForceTorque()

void chrono::ChLoadBodyBodyBushingGeneric::ComputeBodyBodyForceTorque	(	const ChFrameMoving<> &	rel_AB,
		ChVector3d &	loc_force,
		ChVector3d &	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.

Implements chrono::ChLoadBodyBody.

◆ IsStiff()

virtual bool chrono::ChLoadBodyBodyBushingGeneric::IsStiff ( )

inlineoverrideprotectedvirtual

Report if this is load is stiff.

If so, InjectKRMMatrices will provide the Jacobians of the load.

Implements chrono::ChLoadBase.

◆ NeutralDisplacement()

ChFrame& chrono::ChLoadBodyBodyBushingGeneric::NeutralDisplacement ( )

inline

Set/get the initial pre-displacement of the bushing, as the pre-displacement of A, expressed in local coordinate system of loc_application_B.

Default behavior is no initial pre-displacement.

◆ SetNeutralForce()

void chrono::ChLoadBodyBodyBushingGeneric::SetNeutralForce ( const ChVector3d mf )

inline

Set the initial pre-load of the bushing, applied to loc_application_A, expressed in local coordinate system of loc_application_B.

By default it is zero.

◆ SetNeutralTorque()

void chrono::ChLoadBodyBodyBushingGeneric::SetNeutralTorque ( const ChVector3d mt )

inline

Set the initial pre-load torque of the bushing, applied to loc_application_A, expressed in local coordinate system of loc_application_B.

By default it is zero.

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

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ ChLoadBodyBodyBushingGeneric()

Member Function Documentation

◆ ComputeBodyBodyForceTorque()

◆ IsStiff()

◆ NeutralDisplacement()

◆ SetNeutralForce()

◆ SetNeutralTorque()