Spool with a Preload

To avoid chattering when using a spool in a hydraulic valve, it is often necessary to hold the spool in a locked position until the external force exceeds a certain threshold value. In this example, we will explore the interaction between such a force and the spool’s position in a spool with a preload.

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Spool Structure

The image shows a schematic drawing of a spool that can easily be transferred to a model using SystemModeler and the ElastoGap elements found in the Modelica.Mechanics library.
In the PreLoad model in the Mechanics library, a sinusoidal force acts on a spool of a certain mass. In order for the spool to move in either direction, this force has to cross a certain threshold value where it overcomes friction. The model also contains a spring that ensures the return of the spool into a neutral position if the force is removed.

Simulation Results and custom animation

Create interactive custom animations of the simulation result to your liking using built-in Mathematica functions.

Model a spool with a preload

Use Wolfram SystemModeler Link to create a model‐based interactive CDF to visualize the system.