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I try to analysis universal joint (Cardan's joint) in MDO
the mechanism is composed with 2 universal joint, i have a slide between U joint.
on enter shaft, i use a speed servomotor
on exit shat, i use a torque servomoteur
It'OK, a speed and torque values are consistent
But, for design the bearing betwenn cross and fork, i need to calculate the forces on cross
of course, this force is torque/ fork radius (tangential force)
in pivot link (red circle) link betwen fork and cross
Creo fin a right torque value, if i ask a radial torque of this link.
logically, if i ask a radial force of this link ( axial is not possible with my link) he has to give me 3600N approximately.
But it's wrong! Creo return 0.05N
For this step, i don't use external load
and he give me
I don't find my error !!
now, i create a simplified model.
I use 1 universal joint
red arrow = servomotor constant speed
green arrow = servomotor constant torque
when i run simulation i find speed and torque oscillate. of course it's OK because this joint are not