With which joint can I prevent a rotation around the roll axis?

I'm trying to adapt the "Linear Transport System" example from the "Simscape Multibody Parts Library" by allowing the transport system to also move up and down. However, my adjustment with "planar joint" no longer works because I need more freedom of rotation. However, when I remove the planar joint, the carriage rotates around the track.

Answer 1

[Steve Miller]

Hi Nils - the Planar Joint is a simple way to keep the vehicle chassis parallel with the plane that the track is in, and it assumes the track is only in one plane.

• If your track is still in a single plane, you can add a degree of freedom to the chassis using a Prismatic Joint. This will let the chassis move up-and-down relative to the plane where the track is.
• If you want to permit the chassis to rotate around the track, you can add a Revolute Joint to the chassis to add an additional degree of freedom. You can control that degree of freedom by enabling a motion input.

--Steve

[Nils Boller]

Hi Steve, first of all thanks for the quick reply. In my problem, the rail is no longer in one plane (see image).

I managed to get the carriage to follow the track, but it now rotates around the z-axis (see image), which I want to prevent.