OpenSim::Muscle::FiberVelocityInfo Struct Reference

FiberVelocityInfo contains velocity quantities related to the velocity of the muscle (fiber + tendon) complex. More...

#include <Muscle.h>

Public Member Functions
	FiberVelocityInfo ()

Public Attributes
double	fiberVelocity
double	fiberVelocityAlongTendon
double	normFiberVelocity
double	pennationAngularVelocity
double	tendonVelocity
double	normTendonVelocity
double	fiberForceVelocityMultiplier
SimTK::Vector	userDefinedVelocityExtras

Friends
std::ostream &	operator<< (std::ostream &o, const FiberVelocityInfo &fvi)

Detailed Description

FiberVelocityInfo contains velocity quantities related to the velocity of the muscle (fiber + tendon) complex.

The function that populates this struct, calcFiberVelocityInfo, is called when position and velocity information is known. This function is the second function that is called of these related functions:calcMuscleLengthInfo,calcFiberVelocityInfo and calcMuscleDynamicInfo. When calcFiberVelocity is called the acceleration of the muscle path, and any forces the muscle experiences will not be known.

NAME DIMENSION UNITS fiberVelocity length/time m/s fiberVelocityAlongTendon length/time m/s [1] normFiberVelocity (length/time)/Vmax NA [2]

pennationAngularVelocity angle/time rad/s [3]

tendonVelocity length/time m/s normTendonVelocity (length/time)/length (m/s)/m [4]

fiberForceVelocityMultiplier force/force NA [5]

userDefinedVelocityExtras NA NA [6]

[1] fiberVelocityAlongTendon is the first derivative of the symbolic equation that defines the fiberLengthAlongTendon.

[2] normFiberVelocity is the fiberVelocity normalized with respect to the optimal fiber length of the fiber and the maximum fiber velocity defined in fiber-lengths/s.

[3] The sign of the angular velocity is defined using the right hand rule.

[4] normTendonVelocity is the tendonVelocity (the lengthening velocity of the tendon) divided by its resting length

[5] The fiberForceVelocityMultiplier is the scaling factor that represents how a muscle fiber's force generating capacity is modulated by the contraction (concentric or eccentric) velocity of the fiber. Generally this curve has a value of 1 at a fiber velocity of 0, has a value of between 1.4-1.8 at the maximum eccentric contraction velocity and a value of 0 at the maximum concentric contraction velocity. The force velocit curve, which computes this term, is usually an interpolation of an experimental curve.

[6] This vector is left for the muscle modeler to populate with any computationally expensive quantities that are computed in calcFiberVelocityInfo, and required for use in the user defined function calcMuscleDynamicsInfo. None of the parent classes make any assumptions about what is or isn't in this field

• use as necessary.

Constructor & Destructor Documentation

OpenSim::Muscle::FiberVelocityInfo::FiberVelocityInfo ( )

inline

Friends And Related Function Documentation

std::ostream& operator<< ( std::ostream &  o, const FiberVelocityInfo &  fvi  )

friend

Member Data Documentation

double OpenSim::Muscle::FiberVelocityInfo::fiberForceVelocityMultiplier

double OpenSim::Muscle::FiberVelocityInfo::fiberVelocity

double OpenSim::Muscle::FiberVelocityInfo::fiberVelocityAlongTendon

double OpenSim::Muscle::FiberVelocityInfo::normFiberVelocity

double OpenSim::Muscle::FiberVelocityInfo::normTendonVelocity

double OpenSim::Muscle::FiberVelocityInfo::pennationAngularVelocity

double OpenSim::Muscle::FiberVelocityInfo::tendonVelocity

SimTK::Vector OpenSim::Muscle::FiberVelocityInfo::userDefinedVelocityExtras

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

• E:/Projects/OpenSimTrunk/OpenSim/Simulation/Model/Muscle.h