Has anyone here ever worked on dynamic analysis of a theo jansen walking mechanism using creo mechanism? I am working on a school
project in which I need to do some torque analysis on the crank shaft for this mechanism. I used creo mechanism to create the model with
all the constraints. I used a servo motor with constant angular velocity at the crank and created a measure at the motor for the torque. When
I run the dynamic analysis including gravity for this model, the torque plot shows that the input torque is varying from positive to negative
direction which makes no sense to me.
I will appreciate if anyone here who has worked on it can give me insights into what I did wrong.

Thanks!