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Equivalent <transmission> or <actuator> tags in SDF (compared to URDF)

asked 2012-11-29 19:02:31 -0600

Gwen gravatar image

updated 2012-11-30 10:00:12 -0600

Does anyone know what Gazebo 1.2 does with the information in <transmission> or <actuator> tags? Perhaps using plugins? I know I can, for instance, use a model plugin to set one joint angle to be equivalent to another joint angle in the OnUpdate() function, but this seems to screw with the physics (and generally be an inelegant hack).

Has anyone had any luck loading the old pr2 gripper into new Gazebo? May be you can point me to an example of how to implement actuator or transmission models? I guess what I'm really interested in is a more elegant way to access the physics engine via a plugin to write my own transmissions like the ones used by pr2, or at least get theirs to work within a new Gazebo model.

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hey. so did u figure out how to attach the pr2 controller to the robot in sdf format?

gazer gravatar imagegazer ( 2013-05-27 11:25:27 -0600 )edit

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answered 2012-11-30 11:57:04 -0600

hsu gravatar image

Hi Gwen,

The transmission and actuator tags are used by the pr2_mechanism_model package. Upstream to that, pr2_mechanism_model is loaded through the gazebo_ros_controller_manager plugin. I've tried to explain it a little bit in the header file copied over to drcsim.

If you want to see the pr2 gripper in action in the new gazebo, try it out in the groovy release of pr2_simulator by simulating the entire PR2. Otherwise, with a little bit of work, you might be able to get a working gripper by itself by stripping out the rest of the robot.

The different types of transmissions are implemented here.

Hope this helps. John

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Checkout the new ros_control: http://www.ros.org/wiki/ros_control

nkoenig gravatar imagenkoenig ( 2013-07-23 17:09:54 -0600 )edit

This is an update to an old thread, as of today (Feb 16, 2016) there is no native transmission or actuator tags in SDF. Some beginning discussions on how to generalize actuators/transmission into SDF be found here https://bitbucket.org/osrf/gazebo_design/src/090bd9e7997523a97002ca55b2ac253b612845d6/transmission/transmission.md?fileviewer=file-view-default , inputs welcome.

hsu gravatar imagehsu ( 2016-02-16 11:15:25 -0600 )edit
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Asked: 2012-11-29 19:02:31 -0600

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Last updated: Nov 30 '12