artisynth.core.materials

Class UnidirectionalLinearAxialMaterial

java.lang.Object

artisynth.core.materials.MaterialBase

artisynth.core.materials.AxialMaterial

artisynth.core.materials.LinearAxialMaterial

artisynth.core.materials.UnidirectionalLinearAxialMaterial

All Implemented Interfaces:

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

public class UnidirectionalLinearAxialMaterial
extends LinearAxialMaterial

If distance is less than rest length, applies no force

Author:

"Antonio Sanchez" Creation date: 25 Jan 2013

Field Summary

Fields inherited from class artisynth.core.materials.LinearAxialMaterial

myProps

Constructor Summary

Constructors

Constructor and Description
UnidirectionalLinearAxialMaterial()
UnidirectionalLinearAxialMaterial(double k, double d)

Method Summary

Modifier and Type	Method and Description
LinearAxialMaterial	clone() Returns a clone of this composite property.
double	computeDFdl(double l, double ldot, double l0, double excitation) Computes and returns the derivative of the axial spring tension with respect to the length.
double	computeF(double l, double ldot, double l0, double excitation) Computes and returns the axial spring tension, as a function of length, length time derivative, rest length, and excitation.
boolean	equals(AxialMaterial mat)
boolean	isDFdldotZero() Returns true if computeDFdldot() always returns zero.

Methods inherited from class artisynth.core.materials.LinearAxialMaterial

computeDFdldot, getAllPropertyInfo, getDamping, getDampingMode, getStiffness, getStiffnessMode, scaleDistance, scaleMass, setDamping, setDampingMode, setStiffness, setStiffnessMode

Methods inherited from class artisynth.core.materials.AxialMaterial

equals, getSubClasses

Methods inherited from class artisynth.core.materials.MaterialBase

advanceState, createStateObject, getProperty, getPropertyHost, getPropertyInfo, hasProperty, hasState, hasSymmetricTangent, isWritable, postscan, scan, setPropertyHost, setPropertyInfo, symmetryOrStateChanged, updateMaterial, write, writeItems

Methods inherited from class java.lang.Object

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

Constructor Detail

UnidirectionalLinearAxialMaterial

public UnidirectionalLinearAxialMaterial()

UnidirectionalLinearAxialMaterial

public UnidirectionalLinearAxialMaterial(double k,
                                         double d)

Method Detail

computeF

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

Description copied from class: AxialMaterial

Computes and returns the axial spring tension, as a function of length, length time derivative, rest length, and excitation.

Overrides:

computeF in class LinearAxialMaterial

Parameters:

l - spring length

ldot - spring length time derivative

l0 - spring rest length

excitation - excitation value (varying from 0 to 1)

Returns:

spring tension

computeDFdl

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

Description copied from class: AxialMaterial

Computes and returns the derivative of the axial spring tension with respect to the length.

Overrides:

computeDFdl in class LinearAxialMaterial

Parameters:

l - spring length

ldot - spring length time derivative

l0 - spring rest length

excitation - excitation value (varying from 0 to 1)

Returns:

tension derivative with respect to length

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.

Overrides:

isDFdldotZero in class LinearAxialMaterial

equals

public boolean equals(AxialMaterial mat)

Overrides:

equals in class LinearAxialMaterial

clone

public LinearAxialMaterial clone()

Description copied from interface: CompositeProperty

Returns a clone of this composite property.

Specified by:

clone in interface CompositeProperty

Specified by:

clone in interface Clonable

Overrides:

clone in class LinearAxialMaterial

Returns:

clone of this property