artisynth.core.materials

Class UWLigamentMaterial

java.lang.Object

artisynth.core.materials.MaterialBase

artisynth.core.materials.AxialMaterial

artisynth.core.materials.UWLigamentMaterial

All Implemented Interfaces:

ScalableUnits, java.lang.Cloneable, CompositeProperty, HasProperties, Clonable, Scannable

public class UWLigamentMaterial
extends AxialMaterial

The ligament model used in the University of Wisconsin knee model. Based on: Blankevoort, L., and Huiskes, R. (1991). Ligament-bone interaction in a three-dimensional model of the knee. Journal of Biomechanical Engineering, 113(3), 263-269. implementation adapted from UW SimTk plugin: https://simtk.org/home/uwmodels Notes: - the restLength property in the associated spring is used as the referenceLength in the UW formulation, where referenceLength is the length of the ligament when the joint is in the reference position (full extension).

Field Summary

Fields

Modifier and Type	Field and Description
static PropertyList	myProps

Constructor Summary

Constructors

Constructor and Description
UWLigamentMaterial()

Method Summary

Modifier and Type	Method and Description
double	computeDFdl(double l, double ldot, double l0, double excitation)
double	computeDFdldot(double l, double ldot, double l0, double excitation)
double	computeF(double l, double ldot, double l0, double excitation)
PropertyList	getAllPropertyInfo() Returns a list giving static information about all properties exported by this object.
double	getLigamentTransitionStrain()
double	getLinearStiffness()
double	getMaxForce()
double	getNormalizedDamping()
double	getReferenceStrain()
double	getTendonSlackLength()
boolean	isDFdldotZero() Returns true if computeDFdldot() always returns zero.
void	setLigamentTransitionStrain(double ligamentTransitionStrain)
void	setLinearStiffness(double linearStiffness)
void	setMaxForce(double maxForce)
void	setNormalizedDamping(double normalizedDamping)
void	setReferenceStrain(double referenceStrain)
void	setTendonSlackLength(double tendonSlackLength)

Methods inherited from class artisynth.core.materials.AxialMaterial

clone, equals, equals, getSubClasses

Methods inherited from class artisynth.core.materials.MaterialBase

getProperty, getPropertyHost, getPropertyInfo, hasProperty, hasSymmetricTangent, isWritable, scaleDistance, scaleMass, scan, setPropertyHost, setPropertyInfo, tangentSymmetryChanged, updateMaterial, write

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

myProps

public static PropertyList myProps

Constructor Detail

UWLigamentMaterial

public UWLigamentMaterial()

Method Detail

getAllPropertyInfo

public PropertyList getAllPropertyInfo()

Description copied from interface: HasProperties

Returns a list giving static information about all properties exported by this object.

Specified by:

getAllPropertyInfo in interface HasProperties

Overrides:

getAllPropertyInfo in class MaterialBase

Returns:

static information for all exported properties

computeF

public double computeF(double l,
                       double ldot,
                       double l0,
                       double excitation)

Specified by:

computeF in class AxialMaterial

computeDFdl

public double computeDFdl(double l,
                          double ldot,
                          double l0,
                          double excitation)

Specified by:

computeDFdl in class AxialMaterial

computeDFdldot

public double computeDFdldot(double l,
                             double ldot,
                             double l0,
                             double excitation)

Specified by:

computeDFdldot in class AxialMaterial

isDFdldotZero

public boolean isDFdldotZero()

Description copied from class: AxialMaterial

Returns true if computeDFdldot() always returns zero. For a linear spring, this simply means the damping is zero. When dFdldot is always 0, then stiffness matrix will be symmetric.

Specified by:

isDFdldotZero in class AxialMaterial

getReferenceStrain

public double getReferenceStrain()

setReferenceStrain

public void setReferenceStrain(double referenceStrain)

getLinearStiffness

public double getLinearStiffness()

setLinearStiffness

public void setLinearStiffness(double linearStiffness)

getLigamentTransitionStrain

public double getLigamentTransitionStrain()

setLigamentTransitionStrain

public void setLigamentTransitionStrain(double ligamentTransitionStrain)

getNormalizedDamping

public double getNormalizedDamping()

setNormalizedDamping

public void setNormalizedDamping(double normalizedDamping)

getMaxForce

public double getMaxForce()

setMaxForce

public void setMaxForce(double maxForce)

getTendonSlackLength

public double getTendonSlackLength()

setTendonSlackLength

public void setTendonSlackLength(double tendonSlackLength)