Force::TwoPointLinearSpring Class Reference

#include <Force.h>

Inheritance diagram for Force::TwoPointLinearSpring:

List of all members.

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Detailed Description

A linear spring between two points, specified as a station on each of two bodies.

The stiffness k and unstretched length x0 are provided. Then if d is the unit vector from point1 to point2, and x the current separation, we have f = k(x-x0) and we apply a force f*d to point1 and -f*d to point2. This contributes to potential energy: pe = 1/2 k (x-x0)^2. It is an error if the two points become coincident, since we are unable to determine a direction for the force in that case.

Public Member Functions
	TwoPointLinearSpring (GeneralForceSubsystem &forces, const MobilizedBody &body1, const Vec3 &station1, const MobilizedBody &body2, const Vec3 &station2, Real k, Real x0)
	Create a TwoPointLinearSpring.
	SimTK_INSERT_DERIVED_HANDLE_DECLARATIONS (TwoPointLinearSpring, TwoPointLinearSpringImpl, Force)

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Constructor & Destructor Documentation

TwoPointLinearSpring	(	GeneralForceSubsystem &	forces,
		const MobilizedBody &	body1,
		const Vec3 &	station1,
		const MobilizedBody &	body2,
		const Vec3 &	station2,
		Real	k,
		Real	x0
	)

Create a TwoPointLinearSpring.

Parameters:

	forces	the subsystem to which this force should be added
	body1	the first body to which the force should be applied
	station1	the location on the first body at which the force should be applied
	body2	the second body to which the force should be applied
	station2	the location on the second body at which the force should be applied
	k	the spring constant
	x0	the distance at which the force is 0

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Member Function Documentation

SimTK_INSERT_DERIVED_HANDLE_DECLARATIONS	(	TwoPointLinearSpring	,
		TwoPointLinearSpringImpl	,
		Force
	)

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

• Force.h