System::CCableRM Class Reference

#include <CCable.h>

Inheritance diagram for System::CCableRM:

Collaboration diagram for System::CCableRM:

Classes
struct	element

Public Member Functions
	CCableRM (const string &simObjectName, ISimObjectCreator *const creator)
	Reads parameters, registers states, input/output ports and shared resources.
void	OdeFcn (const double T, const double *const X, double *const XDot, const bool bIsMajorTimeStep)
	Computes object derivatives as a function of time, states and input ports.
void	InitialConditionSetup (const double T, const double *const currentIC, double *const updatedIC, ISimObjectCreator *const creator)
void	FinalSetup (const double T, const double *const X, ISimObjectCreator *const creator)
const double *	forceA (const double T, const double *const X)
	Output port. Returns current force in endpoint A of cable.
const double *	forceB (const double T, const double *const X)
	Output port. Returns current force in endpoint B of cable.
void	calculations (const double T, const double *const X)
	Performs a series of computations within the cable object.
const double *	OutPos (const double T, const double *const X, const int i)

Protected Types
typedef Eigen::Matrix< double, 3, 3 >	mat3
typedef Eigen::Matrix< double, 3, 1 >	vec3

Protected Member Functions
void	DistributeCatenary (Eigen::Matrix< double, 3, 1 > P1, Eigen::Matrix< double, 3, 1 > P2, double L, double *states, int i1, int i2, ISimObjectCreator *creator)

Protected Attributes
CPrintDuringExec *	m_print
CEnvironment *	m_environment
int	m_numElements
double	m_totalLength
double	m_radius
double	m_weight
double	m_alphaN
double	m_betaN
double	m_epsilonN
double	m_alphaM
double	m_betaM
double	m_epsilonM
double	m_alphaT
double	m_betaT
double	m_epsilonT
double	m_bending_epsilon [3]
double	m_length
double	m_mass
double	m_Ixy
double	m_Iz
bool	m_kelp
double	m_wKelp
element *	m_el
ISignalPort *	m_posA
ISignalPort *	m_posB
ISignalPort *	m_velA
ISignalPort *	m_velB
ISignalPort *	m_retractedLengthA
ISignalPort *	m_retractedLengthB
ISignalPort *	m_retractedSpeedA
ISignalPort *	m_retractedSpeedB
int	m_retractedNodesA
int	m_retractedNodesB
int	m_numFreeNodes
vec3	m_ka
vec3	m_kb
ICommonComputation *	m_calcDynamics
Eigen::Matrix< double, Eigen::Dynamic, 1 >	m_lambda
Eigen::Matrix< double, Eigen::Dynamic, 1 >	m_F_MDotV
double	m_forceA [3]
double	m_forceB [3]
int	m_numAddedForce
std::unique_ptr< int[]>	m_addElement
std::unique_ptr< double[]>	m_addForce
int	m_numOutElePos
std::unique_ptr< int[]>	m_OutEleIndex

Detailed Description

Author

Jørgen Haavind Jensen

Simobject name for use in input file: Cable.

Retains the same structural properties as the simObject CFlexibleBottomRing, but has a simpler interface where Young's and shear moduluses are provided rather than using the \(\alpha\), \(\beta\) and \(\epsilon\) values used in CFlexibleBottomRing.

Parameters

Parameter	Default	Comment
cableLength	-	total length of the cable [m]
numElements	-	number of rigid elements in the cable [#]
diameter	-	diameter of the cable. [m]
cableWeight	-	weight of the cable [kg/m]
E-modulus	-	Young's modulus for cable material[GPa]
G-modulus	\(\frac{E-modulus}{2.6}\)	shear modulus for cable material[GPa]
damping	1	structural damping in the cable [-]
updateFreq	-	parameter which preserves simulation stability [-]
stabilityFactor	-	parameter which preserves simulation stability [-]

Input ports

Tag	Size	Comment
PositionA	3	position of end-connection point A
PositionB	3	position of end-connection point B
VelocityA	3	velocity of end-connection point A
VelocityB	3	velocity of end-connection point B
RetractedLengthA	1	length of cable retracted on side A
RetractedLengthB	1	length of cable retracted on side B
RetractedSpeedA	1	retraction rate of cable retracted on side A
RetractedSpeedB	1	retraction rate of cable retracted on side B

Output ports

Tag	Size	Comment
ForceA	3	Reaction force on side A
ForceB	3	Reaction force on side B

States

Tag	Size	Comment
pos<i>	3	Position (x,y,z) of element with index <i>
vel<i>	3	Velocity of element with index <i>
theta<i>	4	Quaternion of element with index <i>
omega<i>	3	Angular derivatives of element (?) <i>

Note

The hydrodynamic load model does not currently support the effect of added mass.

 \par Revision history:
                    Q3 2011 JHJ: Initial version.

Constructor & Destructor Documentation

CCableRM()

System::CCableRM::CCableRM	(	const string &	simObjectName,
		ISimObjectCreator *const	creator
	)

The constructor performs all initial setup for a cable simobject. Reading in parameters, setting up communication interface i.e. output ports, input ports, and states, plus additional 'one time only' resource setup.

Parameters

[in]	simObjectName	-> The name of the simobject
[in]	creator	-> Retrieve parameters. Register states, ports and shared resources reads parameters, registers states, output and intput ports.

Member Function Documentation

calculations()

void System::CCableRM::calculations	(	const double	T,
		const double *const	X
	)

Computations that are important for the cable object dynamics, but only should be called once during each time step when simulating. Results are stored in member variables in the object.

Parameters

[in]	T	-> Current simulation time
[in]	X	-> Current simulation state

forceA()

const double * System::CCableRM::forceA	(	const double	T,
		const double *const	X
	)

See PortDefs.h

Parameters

[in]	T	-> Current simulation time
[in]	X	-> Current simulation state

Returns

-> Address of current force in endpoint A of cable

forceB()

const double * System::CCableRM::forceB	(	const double	T,
		const double *const	X
	)

See PortDefs.h

Parameters

[in]	T	-> Current simulation time
[in]	X	-> Current simulation state

Returns

-> Address of current force in endpoint B of cable

OdeFcn()

void System::CCableRM::OdeFcn	(	const double	T,
		const double *const	X,
		double *const	XDot,
		const bool	bIsMajorTimeStep
	)

Returns state derivatives.

Parameters

[in]	T	-> Current simulation time
[in]	X	-> Current simulation state
[out]	XDot	-> State derivatives
[in]	bIsMajorTimeStep	-> Is this a major time step?

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

• /update_root/webfhsim/reloadrepos/fhsim_maritime/src/system/CCable.h