White Paper: Robust Tracking Control of Mobile Robot Formation with Obstacle Avoidance

In this paper, we suggest a robust formation tracking scheme for a team of constrained wheeled mobile robots (WMRs) in the environment with obstacles. Our first main result is that the problem of finding the collision-free trajectory for the robots can be formulated as a nonconvex optimization problem under general convex obstacle assumption and solved using MILP method. Our second main result concerns moving horizon formation control of multiple mobile robots with parametric uncertainties and actuator saturations.

01/26/2011


We consider the formation control problem of multiple wheeled mobile robots with parametric uncertainties and actuator saturations in the environment with obstacles. First, a nonconvex optimization problem is introduced to generate the collision-free trajectory. If the robots tracking along the reference trajectory find themselves moving close to the obstacles, a new collision-free trajectory is generated automatically by solving the optimization problem. Then, a distributed control scheme is proposed to keep the robots tracking the reference trajectory. For each interacting robot, optimal control problem is generated. And in the framework of LMI optimization, a distributed moving horizon control scheme is formulated as online solving each optimal control problem at each sampling time.Moreover, closed-loop properties inclusive of stability and H∞ performance are discussed. Finally, simulation is performed to highlight the effectiveness of the proposed control law.

 

Click here to download the white paper.



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