Hi all, I am trying to model a quadrotor, i have the .model file from an old implementation in gazebo but i need to rewrite it as a .urdf to be used in ROS. My problem is that rather then setting the inertia for each link i would like to set it for the whole robot (in fact the controller will consider the quadrotor as a unique body). Is it possible somehow?
Thank you
Originally posted by erpa on ROS Answers with karma: 111 on 2011-08-25
Post score: 2
...moving my comment here as I ran out of room :)
If the links are connected via fixed joints, you should be able to assign inertia to any one of the fixed-joint-connected links and set the rest of the links inertia to some very small numbers (1e-6). As of diamondback, inertia of fix-joint-connected links are lumped into their parent. In general, 0 inertia will not work as the urdf2gazebo parser will ignore the link and break the kinematic chain.
On the other hand, non-fixed-joint-connected links with inertia close to 0 might make your dynamics unstable.
Originally posted by hsu with karma: 5780 on 2011-08-25
This answer was ACCEPTED on the original site
Post score: 0
Comment by erpa on 2011-08-29:
thanks a lot for your help