Discussion Forum

Hi Varsha,

This example (which is also distributed with the product in Application Libraries) shows how to model a traveling load:

https://www.comsol.com/model/beam-subjected-to-traveling-load-22251

In this blog post, you will find another example:

https://www.comsol.com/blogs/how-to-make-boundary-conditions-conditional-in-your-simulation/

Regards,

Henrik

Hi Henrik, Thank you for your help. I have already gone through the travelling load example given in comsol. But the problem here is as shown in the attached screenshot of loading diagram the spacing between the loads varies. So I cannot make a single load travelling as periodic with some spacing.

Hi Varsha,

You have to add several such loads, with a shift between them. You can still use one single loading function, you just have to call it with arguments which is shifted in space or time from the different load features.

Regards,

Henrik

Hi Henrik, Thank you for your suggestion. But the example u have suggested (travelling load on beam) has a pulse width load of 2m which cannot be treated as point load which is required in my case. I tried reducing the pulse width but the results are not appropriate. So how can I apply moving point load.

Hi Varsha,

Applying a point load at a general position (which is not a point, and possibly not even a mesh node) is bit tricky. There is no built-in feature which can do that, not even for a non-moving load.

You can however do this, using a General Extrusion coupling operator to pick out the displacement at an arbitrary location (which changes as the load moves), and then add your own weak contribution for the load using an expression like 1[kN]*test(genext1(v)) .

Regards,

Henrik