Spring-Force Function-Block

Use the Spring-Force FB to apply a force between two Points.

The force is a function of different parameters.

Edit the Spring-Force FB to edit the different parameters.


See: Add Spring Force FB, Tutorial 13: Use Forces, 'Configure Power Source'.


tog_plusSpring-Force FB dialog-box

Dialog-R10-SpringFB-SpringParameters

A Spring All of the Forces are 'super-imposed' to give a total force.

Spring Parameters...

Enable Spring Force check box.

It is active by default.

Spring-Rate:

The Force [in Force Units] exerted by the Spring for each Linear Unit [in Linear Units] difference between the Free-Length and the actual distance between the Points.

Free-Length:

At this length, the 'Spring' will exert a force between the Points equal to the Constant Force, which may be zero.

Constant-Force:

A Positive value will pull Points together.

A Negative value will push Points apart.

See Machine Settings for Force Units.

Dialog-R10-SpringFB-VelocityParameters

Velocity Parameters...

Coulomb Friction Force: (Ff = μ.F)
A Constant Force that is opposite to the direction of the motion.
The Force is intended to be similar to a Friction Force. It is NOT Friction Force.
Note: MechDesigner cannot model Friction Force since it is not a Kinetostatic Force.
Viscous Coefficient: (Fv α V)
A Force that is proportional to the relative velocity between the Points.
The Force is opposite to the direction of motion.
Drag Factor: (Fd α V2)
A Force that is proportional to relative velocity and squared.
For example, air resistance.
The Force is opposite to the direction of motion.

See Machine Settings for Force Units.

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