Hello,

I have a basic question about how the motion calculations are carried out in UM7. A rigid body, e.g. a disk, consists of multiple mass points. Does the software consider a defined number of mass point to carry out motion calculatioons or does the software consider only the center of mass for a body to carry out the motion calculations?

I ask this because I have designed an overhanging spinning disk which rotates in a certain distance around a fixed pivot. If I run the simulation the spinning disk should precess around the pivot due to gyroscopic effects, however, the calculated motion results in a more ore less chaotic oscillationg motion (not nutation motion) but not in an unform precessing motion, which would be expected as a rule.

Is there a possibilty in UM7 to consider not only the center of mass of an object but consider a certain number of mass points of an object?

Thank you in advance for your feedback.

Best regards,

Harry