Description

Base class for all constitutive models of sections of Tapered Timoshenko beams.

This tapered section consists of two objects of ChBeamSectionTimoshenkoAdvancedGeneric. To be used with ChElementBeamTaperedTimoshenko.

#include <ChBeamSectionTaperedTimoshenko.h>

Inheritance diagram for chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric:

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Public Member Functions
void	SetLength (double mv)
	Set the length of beam element with two sections.

double	GetLength () const
	Get the length of beam element with two sections.

void	SetLumpedMassMatrixType (bool mv)
	Set the type of mass matrix: More...

bool	GetLumpedMassMatrixType () const
	Get the type of mass matrix： More...

void	SetSectionA (std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric > my_material)
	Set the section & material of beam element at end A.

void	SetSectionB (std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric > my_material)
	Set the section & material of beam element at end B.

std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric >	GetSectionA ()
	Get the section & material of the element at end A.

std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric >	GetSectionB ()
	Get the section & material of the element at end B.

virtual void	ComputeInertiaMatrix (ChMatrixDynamic<> &M)
	Compute the 12x12 sectional inertia matrix, as in {x_momentum,w_momentum}=[Mm]{xvel,wvel} The matrix is computed in the material reference (i.e. More...

virtual void	ComputeInertiaDampingMatrix (ChMatrixNM< double, 12, 12 > &Ri, const ChVector<> &mW_A, const ChVector<> &mW_B)
	Compute the 12x12 local inertial-damping (gyroscopic damping) matrix. More...

virtual void	ComputeInertiaStiffnessMatrix (ChMatrixNM< double, 12, 12 > &Ki, const ChVector<> &mWvel_A, const ChVector<> &mWacc_A, const ChVector<> &mXacc_A, const ChVector<> &mWvel_B, const ChVector<> &mWacc_B, const ChVector<> &mXacc_B)
	Compute the 12x12 local inertial-stiffness matrix. More...

virtual DampingCoefficients	GetBeamRaleyghDamping () const
	Get the average damping parameters of this tapered cross-section.

virtual void	ComputeAverageSectionParameters ()
	Compute the average section parameters: mass, inertia and rigidity, etc.

virtual std::shared_ptr< AverageSectionParameters >	GetAverageSectionParameters () const
	Get the average sectional parameters(mass, inertia and rigidity, etc.) of this tapered cross-section.

Public Attributes
bool	compute_inertia_damping_matrix = true
	Flag that turns on/off the computation of the [Ri] 'gyroscopic' inertial damping matrix. More...

bool	compute_inertia_stiffness_matrix = true
	Flag that turns on/off the computation of the [Ki] inertial stiffness matrix. More...

bool	compute_Ri_Ki_by_num_diff = false
	Flag for computing the Ri and Ki matrices via numerical differentiation even if an analytical expression is provided. More...

bool	compute_ave_sec_par = false
	A lock to avoid computing avg_sec_par several times, initialized as false by default. More...

Protected Member Functions
virtual void	ComputeLumpedInertiaMatrix (ChMatrixNM< double, 12, 12 > &M)
	Compute the 12x12 sectional inertia matrix in lumped format, as in {x_momentum,w_momentum}=[Mm]{xvel,wvel} The matrix is computed in the material reference (i.e. More...

virtual void	ComputeSimpleConsistentInertiaMatrix (ChMatrixNM< double, 12, 12 > &M)

virtual void	ComputeConsistentInertiaMatrix (ChMatrixNM< double, 12, 12 > &M)
	A very generic implementation for consistent mass matrix, considering mass center offset and axis orientation. More...

Protected Attributes
double	length
	The length of beam element with two sections.

std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric >	sectionA
	The section & material of beam element at end A.

std::shared_ptr< ChBeamSectionTimoshenkoAdvancedGeneric >	sectionB
	The section & material of beam element at end B.

bool	use_lumped_mass_matrix
	The type of mass matrix: More...

std::shared_ptr< AverageSectionParameters >	avg_sec_par

Member Function Documentation

◆ ComputeConsistentInertiaMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeConsistentInertiaMatrix ( ChMatrixNM< double, 12, 12 > & M )

protectedvirtual

A very generic implementation for consistent mass matrix, considering mass center offset and axis orientation.

The transformation of mass center offset and mass principal axis orientation is hard-coded.

Parameters

M	12x12 sectional mass matrix values here

◆ ComputeInertiaDampingMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeInertiaDampingMatrix	(	ChMatrixNM< double, 12, 12 > &	Ri,
		const ChVector<> &	mW_A,
		const ChVector<> &	mW_B
	)

virtual

Compute the 12x12 local inertial-damping (gyroscopic damping) matrix.

The lumped format is used, need to multiple 0.5 * length to obtain the final inertial-damping matrix

Parameters

Ri	12x12 sectional inertial-damping matrix values here
mW_A	current angular velocity of section of node A, in material frame
mW_B	current angular velocity of section of node B, in material frame

◆ ComputeInertiaMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeInertiaMatrix ( ChMatrixDynamic<> & M )

virtual

Compute the 12x12 sectional inertia matrix, as in {x_momentum,w_momentum}=[Mm]{xvel,wvel} The matrix is computed in the material reference (i.e.

it is the sectional mass matrix)

Parameters

M	12x12 sectional mass matrix values here

Reimplemented in chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGenericFPM.

◆ ComputeInertiaStiffnessMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeInertiaStiffnessMatrix	(	ChMatrixNM< double, 12, 12 > &	Ki,
		const ChVector<> &	mWvel_A,
		const ChVector<> &	mWacc_A,
		const ChVector<> &	mXacc_A,
		const ChVector<> &	mWvel_B,
		const ChVector<> &	mWacc_B,
		const ChVector<> &	mXacc_B
	)

virtual

Compute the 12x12 local inertial-stiffness matrix.

The lumped format is used, need to multiple 0.5 * length to obtain the final inertial-stiffness matrix

Parameters

Ki	12x12 sectional inertial-stiffness matrix values here
mWvel_A	current angular velocity of section of node A, in material frame
mWacc_A	current angular acceleration of section of node A, in material frame
mXacc_A	current acceleration of section of node A, in material frame)
mWvel_B	current angular velocity of section of node B, in material frame
mWacc_B	current angular acceleration of section of node B, in material frame
mXacc_B	current acceleration of section of node B, in material frame

◆ ComputeLumpedInertiaMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeLumpedInertiaMatrix ( ChMatrixNM< double, 12, 12 > & M )

protectedvirtual

Compute the 12x12 sectional inertia matrix in lumped format, as in {x_momentum,w_momentum}=[Mm]{xvel,wvel} The matrix is computed in the material reference (i.e.

it is the sectional mass matrix)

Parameters

M	12x12 sectional mass matrix values here

◆ ComputeSimpleConsistentInertiaMatrix()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::ComputeSimpleConsistentInertiaMatrix ( ChMatrixNM< double, 12, 12 > & M )

protectedvirtual

Parameters

M	12x12 sectional mass matrix values here

◆ GetLumpedMassMatrixType()

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::GetLumpedMassMatrixType ( ) const

inline

Get the type of mass matrix：

true: lumped mass matrix.
false: consistent mass matrix.

◆ SetLumpedMassMatrixType()

void chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::SetLumpedMassMatrixType ( bool mv )

inline

Set the type of mass matrix:

true: lumped mass matrix, which is default.
false: consistent mass matrix.

Member Data Documentation

◆ compute_ave_sec_par

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::compute_ave_sec_par = false

A lock to avoid computing avg_sec_par several times, initialized as false by default.

If one wants to recalculate the avg_sec_par again, set this variable to 'false' and run ComputeAverageSectionParameters() again.

◆ compute_inertia_damping_matrix

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::compute_inertia_damping_matrix = true

Flag that turns on/off the computation of the [Ri] 'gyroscopic' inertial damping matrix.

If false, Ri=0. Can be used for cpu speedup, profiling, tests. Default: true.

◆ compute_inertia_stiffness_matrix

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::compute_inertia_stiffness_matrix = true

Flag that turns on/off the computation of the [Ki] inertial stiffness matrix.

If false, Ki=0. Can be used for cpu speedup, profiling, tests. Default: true.

◆ compute_Ri_Ki_by_num_diff

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::compute_Ri_Ki_by_num_diff = false

Flag for computing the Ri and Ki matrices via numerical differentiation even if an analytical expression is provided.

Children calsses must take care of this. Default: false.

◆ use_lumped_mass_matrix

bool chrono::fea::ChBeamSectionTaperedTimoshenkoAdvancedGeneric::use_lumped_mass_matrix

protected

The type of mass matrix:

true: lumped mass matrix, which is default.
false: consistent mass matrix.

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

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

Description

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Member Function Documentation

◆ ComputeConsistentInertiaMatrix()

◆ ComputeInertiaDampingMatrix()

◆ ComputeInertiaMatrix()

◆ ComputeInertiaStiffnessMatrix()

◆ ComputeLumpedInertiaMatrix()

◆ ComputeSimpleConsistentInertiaMatrix()

◆ GetLumpedMassMatrixType()

◆ SetLumpedMassMatrixType()

Member Data Documentation

◆ compute_ave_sec_par

◆ compute_inertia_damping_matrix

◆ compute_inertia_stiffness_matrix

◆ compute_Ri_Ki_by_num_diff

◆ use_lumped_mass_matrix