Analytical chain drive system modeling

Chain Drive System Modeling

For various reasons, it is common to simulateSprocketThe assembly, i.e. the dynamics of the chain drive system, is a difficult task.In order to simulate a sprocket drive train, all relevant components in the chain drive must be modeled.However, since a typical chain drive consists of multiple links, which are interconnected and wound around multiple sprockets, it takes a lot of time to build the geometry.

3D animation simulation of a chain drive system.

Even if the geometry of a chain link is accurately established, it is a challenge to replicate the entire geometric system through a suitable method.For example, to model the sprocket-to-sprocket meshing and disengaging mechanism, you need to model the structural contact between the sprocket teeth and the contacting links.Likewise, when simulating rotation between adjacent chain links (helping the chain fit and move the sprockets), it is critical to model the correct dynamics.

In principle, you can set up a chain drive system using different functions in the Multibody Dynamics Module, an add-on product to COMSOL.However, manually setting up the true chain drive geometry and associated physics of each component of the system is time-consuming and error-prone.To simplify these steps and quickly model chain drives, new functionality has been added to COMSOL in version 5.5.

Using the chain drive functionality in the Multibody Dynamics interface, you can easily add a chain drive model setup with multiple physics at the click of a button.To simplify model setup, a series of built-in geometry parts have been added in version 5.5 that can be used to parametrically build the geometry of sprocket assemblies.

In the first part of this article, you will learn how to use the built-in geometry parts from the Parts Library to create custom chain drive geometry.The second part will focus on how the chain rotation function takes the geometric model as input and automatically creates the various physical features required for the analysis.