ROS Resources: Documentation | Support | Discussion Forum | Index | Service Status | ros @ Robotics Stack Exchange |
1 | initial version |
Closed kinamtic chains can not be described by URDF. You have to 'open up' your structure and take care about the constraints using software code that provides the joint coordinates.
Gazebo supports closed chains through SDF:
http://answers.gazebosim.org/question/7308/parallel-robots-implementing-close-kinematic-chains/