Problem with external torques on simscape multibody.

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amatoallah ouchen
amatoallah ouchen 2022-9-30
回答： Steve Miller 2022-11-19
Greeting
I have a problem with the attached mechanism.
Indeed when I apply a resistant torque in joint 1 and an equivalent but opposite internal toque in the same joint there is no motion which is correct,
I tried to check the same approach on the other joints but it does not work
Joint 2 : couldn´t immoblise the joint by applying an equivalent and opposite external torque.
In joint 3: I could not make the mechanism move by applying an external torque. the only thing to make it work was the internal torque on the joint,
Thank you
Best regards

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Steve Miller
Steve Miller 2022-11-19
Hi Amatoallah - you need to make sure the external torque is applied about the z-axis, not x-axis.
You have it correct for "Revolute " but incorrect for "Revolute Joint1". See screenshot below.
If the torque is applied about the x-axis, it has no effect on this planar mechanism.
--Steve

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