artisynth.core.materials

Class EquilibriumAxialMuscleTest

java.lang.Object

maspack.util.UnitTest

artisynth.core.materials.EquilibriumAxialMuscleTest

public class EquilibriumAxialMuscleTest
extends UnitTest

Constructor Summary

Constructors

Constructor and Description
EquilibriumAxialMuscleTest()

Method Summary

Modifier and Type	Method and Description
static void	main(java.lang.String[] args)
void	test()
void	testCompliantDerivatives(EquilibriumAxialMuscle mat, boolean lmDotFromLDot, double lnorm, double a, double ldot) Checks computeDFdl() and computeDFdldot() for a compliant tendon against numeric derivatives of computeF(), holding the muscle state from the previous step fixed.
void	testCompliantScaling(EquilibriumAxialMuscle mat, boolean lmDotFromLDot) For a compliant tendon in mid-simulation, scaleDistance(s) should scale the force by s and leave the stiffness and damping unchanged, both from cached values and after recomputing the muscle length.
void	testDerivatives(EquilibriumAxialMuscle mat)
void	testScaling(EquilibriumAxialMuscle mat) Changing units with scaleDistance() or scaleMass() should scale the force by s, with maxContractionVelocity and fibreDamping unchanged.
void	testSideQuery(EquilibriumAxialMuscle mat, boolean lmDotFromLDot, double lfrac) Checks that a query at a length l2 other than that of the step start, made before the next advanceState(), returns the same values as the next step at l2, and does not change the next step.

Methods inherited from class maspack.util.UnitTest

check, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkEquals, checkNormedEquals, checkNormedEquals, getSilent, printUsageAndExit, runtest, setSilent

Methods inherited from class java.lang.Object

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

Constructor Detail

EquilibriumAxialMuscleTest

public EquilibriumAxialMuscleTest()

Method Detail

testDerivatives

public void testDerivatives(EquilibriumAxialMuscle mat)

testCompliantDerivatives

public void testCompliantDerivatives(EquilibriumAxialMuscle mat,
                                     boolean lmDotFromLDot,
                                     double lnorm,
                                     double a,
                                     double ldot)

Checks computeDFdl() and computeDFdldot() for a compliant tendon against numeric derivatives of computeF(), holding the muscle state from the previous step fixed. With computeLmDotFromLDot false, the force depends on l only (vm = (lm-lmprev)/h), so the backward Euler stiffness K + D/h must match dF/dl. With computeLmDotFromLDot true, K and D must match dF/dl and dF/dldot separately.

testScaling

public void testScaling(EquilibriumAxialMuscle mat)

Changing units with scaleDistance() or scaleMass() should scale the force by s, with maxContractionVelocity and fibreDamping unchanged.

testCompliantScaling

public void testCompliantScaling(EquilibriumAxialMuscle mat,
                                 boolean lmDotFromLDot)

For a compliant tendon in mid-simulation, scaleDistance(s) should scale the force by s and leave the stiffness and damping unchanged, both from cached values and after recomputing the muscle length.

testSideQuery

public void testSideQuery(EquilibriumAxialMuscle mat,
                          boolean lmDotFromLDot,
                          double lfrac)

Checks that a query at a length l2 other than that of the step start, made before the next advanceState(), returns the same values as the next step at l2, and does not change the next step. Also checks that repeated solves at the step start length agree, and that the step can be restored with getState()/setState(). lfrac gives the initial muscle length as a fraction of the optimal fibre length; for values < 1 the muscle is on the ascending limb, and Dm > 0, so that the vm/ldot ratio Dt/(Dm+Dt) is not clipped to 1.

test

public void test()

Overrides:

test in class UnitTest

main

public static void main(java.lang.String[] args)