Forward Dynamics Tool is incorrect after adding the actuator

[yun peng zheng]

Hello everyone, I added an exoskeleton to the knee joint, this exoskeleton and the lower leg with bushingfoce restraint. An actuator is added to the exoskeleton to drive the exoskeleton to move the lower leg. Now Forward Dynamics Tool is used to analyze the torque at the knee joint, as shown in the figure below. The value is very large. I don't know what caused this result. If anyone can give me useful advice, I would be very grateful.

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