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See Add Spring FB
Use a Spring FB to apply a force between two Points. The name we use for the two Points is Anchor-Points.
See also:
Machine Settings > Engineering Units
In Mechanism-Editor:
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Note: It is not necessary to connect a wire to the input-connector or from the output-connectors of the Spring FB. The input and output-connectors provide extra functionality - see Here |
The Spring dialog-box is now open.
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☑ Check-box to enable the Spring FB. Spring-Rate:
Spring-Length is the distance between the two anchor-points. The Force always tries to move the anchor-point to the Free-Length (They cannot, of course). Free-Length:
Constant-Force:
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Coulomb Friction Force: (Ff = μ.Fn )
This parameter is intended to be similar to a Friction Force. However, it is not Friction Force, because the Coulomb Friction-Force parameter is not a function of the Normal Force. Viscous Coefficient: (Fv α V ( N/(mm/s) )
E.g. If the Damping Coefficient = 4 and the Velocity is +100mm/s, (anchor points moving away from each other), The force pulling the points together is a force of 400N. Drag Factor: (Fd α V2) ( N/((mm/s)2 ) )
E.g. If the Drag Factor = 4, and the Velocity = +100mm/s (anchor-points are moving apart), then the force pulling the anchor-points together is a force of 40000N. |
Input-Connector Connect a wire to the input-connector to add a force-function between the Spring's Anchor-Points. The units of the data at the input-connector must be Newtons. Use a Math FB to convert the data-type of the Motion data-type to the Force data-type. For example, the function might be designed as a motion. In which case, you would need to connect the output of a Motion FB , which has units of mm or degrees to a Math FB to convert the units to Newtons. And then connect the output to the Spring-FB Note 1: Units inside the Math FB become SI units. To convert 100mm at the input to a Math FB to 100N, you must: 1.Change the Output Data Type to Force (N) AND 2.Multiply the input-value by 1000 to convert 0.1m to 100N TOP output-connector Dimension, Velocity and Acceleration relating to the distance between the Spring's anchor-points. Bottom output-connector Total Applied-Force between the Spring's anchor-points. oTotal Applied-Force = Force at the Input-connector + Force that results from the parameters as set in the Spring FB dialog-box or oDriving-Force = Linear Motive Force, if you configure the Spring FB as a Linear Motor - see Configure Power Source |