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2020-09-02 16:35:03 -0500 marked best answer where is the controller from /cmd_vel to the force applied to robot?

It seems to me that what ros provides us to control a robot is the expected velocity /cmd_vel, but from this signal to real force/torque applied to the robot, there must be a controller there. Can someone tell me in which file I can see this controller? Thanks.

Actually, I'm not dealing with hardware yet. I mean the pure simulation. e.g. the husky simulator, the /cmd_vel finally goes to the gazebo husky model, and the gazebo model returns the effect of the control. in the rqt_graph i can see the there is a controller between the /cmd_vel and gazebo, but i just cannot find the file which describes it.

2020-09-02 16:34:33 -0500 marked best answer which file implements the husky_velocity_controller?

When I controll the husky simulator, the motion of husky is driven by the /husky_velocity_controller/cmd_vel, I send a cmd_vel topic as expected velocity, the robot moves. But from physics, we know there must be a controller that transform the cmd_vel signal into the force that drives the vehicle. Where can I find the implementation of this controller? in which file? Thanks.

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2019-08-29 06:23:41 -0500 commented answer which file implements the husky_velocity_controller?

isn't it just a choice of which to pass through?

2019-08-28 22:39:27 -0500 commented answer which file implements the husky_velocity_controller?

Thank you. this link just relates to config files, where is the explicit implementation?

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2019-08-27 12:31:06 -0500 answered a question import cv2 error caused by ROS!

i met the same problem, here is how i "solved" it, ugly but worked write "import cv2" into import sys sys.path.remove('

2019-08-26 12:34:11 -0500 commented answer where is the controller from /cmd_vel to the force applied to robot?

sorry, i did not state the question clear enough. I updated it.

2019-08-26 12:33:39 -0500 edited question where is the controller from /cmd_vel to the force applied to robot?

where is the controller from /cmd_vel to the force applied to robot? It seems to me that what ros provides us to control

2019-08-26 08:13:58 -0500 asked a question which file implements the husky_velocity_controller?

which file implements the husky_velocity_controller? When I controll the husky simulator, the motion of husky is driven

2019-08-26 07:45:56 -0500 asked a question where is the controller from /cmd_vel to the force applied to robot?

where is the controller from /cmd_vel to the force applied to robot? It seems to me that what ros provides us to control

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2019-08-20 22:42:23 -0500 commented answer How to create a Publisher about trajectory path, then show it in rviz?

Thanks, this really helps.

2019-08-19 21:14:48 -0500 commented answer how to point and click on rviz map and output the position.

but, the coordinate is only the relative position wrt the vehicle?

2019-08-18 20:33:30 -0500 commented answer Cannot read parameters from file in launch file

I just want to put the "true" in this line <arg name="laser_enabled" value="true"/> in to a yaml file, and read t

2019-08-18 20:31:51 -0500 edited question Cannot read parameters from file in launch file

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fi

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2019-08-18 20:31:03 -0500 edited question Cannot read parameters from file in launch file

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fi

2019-08-16 11:57:14 -0500 asked a question the cmakelist tutorial in wiki.ros for publisher/subscriber is not right

the cmakelist tutorial in wiki.ros for publisher/subscriber is not right http://wiki.ros.org/ROS/Tutorials/WritingPublis

2019-08-13 09:40:55 -0500 commented answer Cannot read parameters from file in launch file

you are not the only one who think so. I think the exercise itself does not make it very clear enough. do you see the se

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2019-08-10 23:15:29 -0500 commented answer Cannot read parameters from file in launch file

Sorry, I havn't got an answer yet. I was saying I am trying to solve it, but got stuck at this point. I said possible be

2019-08-10 23:14:21 -0500 commented answer Cannot read parameters from file in launch file

Sorry, I havn't got an answer yet. I was saying I am trying to solve it, but got stuck at this point.

2019-08-10 22:29:55 -0500 commented answer launching nodes in a new terminal with roslaunch

thanks, this really helps.

2019-08-09 08:01:04 -0500 answered a question Publisher and Subscriber using same node!

I kind of like this one: https://www.youtube.com/watch?v=lR3cK9ZoAF8 Hope this may help

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2019-08-07 20:32:37 -0500 commented answer Cannot read parameters from file in launch file

It is possible. See the tutorial example here: http://wiki.ros.org/ROS/Tutorials/Roslaunch%20tips%20for%20larger%20proje

2019-08-07 07:44:25 -0500 commented answer Cannot read parameters from file in launch file

Thank you. But why can the argument of a function not take value from global variables? And what should I do if I want t

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2019-08-07 00:01:39 -0500 asked a question Cannot read parameters from file in launch file

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fin