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Changing velocity of a fixed object

asked 2017-09-15 05:21:06 -0600

hamzamerzic gravatar image

I have a robot hand model with fingers that are torque controlled. The hand floats and has the task of grasping objects. So far the hand was first fixed to the world (with a revolute joint). Now I would like to add more degrees of freedom in order to allow for the hand to move freely by being able to set the velocities of the base.

The problem is that when I disable the revolute joint to be able to do this, the counter torques from the fingers make the whole model move. What I would like to have is to be able to move the hand around, but to make it act as it is fixed, i.e. to prevent the effects of counter torques to influence it (e.g. just be able to change the linear velocity of the base of the hand, but ignore all the forces acting on it). Is there a way to do that?

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answered 2017-09-15 06:29:47 -0600

hamzamerzic gravatar image

updated 2017-09-16 09:18:41 -0600

After going through the SDF reference, I found the kinematic tag that accomplishes what I wanted. Also, setting this tag allows me to not even have to have the revolute joint mentioned earlier when I simple want the link to be fixed to the world.

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Glad to know you found a solution and that the kinematic tag actually works :)

chapulina gravatar imagechapulina ( 2017-09-15 10:30:24 -0600 )edit
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Asked: 2017-09-15 05:21:06 -0600

Seen: 127 times

Last updated: Sep 16 '17