Task Space Planning

2021

Robotics and
Automation Letters
Jake Welde, James Paulos, and Vijay Kumar

In this work, we address the problem of planning dynamically feasible trajectories for underactuated aerial manipulators to achieve a desired trajectory for the end effector. We consider a quadrotor equipped with an arbitrary n-joint articulated arm. We show that the combined underactuated system is differentially flat, however the flat outputs do not correspond directly to the motion of the end effector. We therefore develop a method which determines the family of flat output trajectories which will exactly produce any desired task trajectory, even in the case of dynamic maneuvers. We also give criteria on the manipulator geometry which will ensure certain important stability properties, informing hardware design. The entire approach is demonstrated in simulation for systems of varying geometry and number of joints. The simultaneous resolution of the kinematic and dynamic constraints allows these tasks to be performed dynamically without sacrificing accuracy.

 

Our paper was a Finalist for “Best Paper in Unmanned Aerial Vehicles” at ICRA 2021.

 

Below is the video attachment for our paper.

 

 

My conference presentation was given virtually due to COVID-19, and the recorded version can be found below.

 

 

J. Welde, J. Paulos and V. Kumar, “Dynamically Feasible Task Space Planning for Underactuated Aerial Manipulators,” in IEEE Robotics and Automation Letters, vol. 6, no. 2, pp. 3232-3239, April 2021, doi: 10.1109/LRA.2021.3051572.

 

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