Robotic formation: initialisation, trajectory planning and decentralised control. (25th September 2008)

• Record Type: Journal Article
• Authors: Nguyen, A.D.; Ngo, V.T.; Ha, Q.P.; Dissanayake, G.
• Is Part Of: International journal of automation and control. Volume 2:Number 1(2008)
• Page Start: 22
• Page End: 45
• Publication Date: 2008-09-25
• Subjects: robotic formation -- virtual head robot -- l-l control -- path planning -- decentralised control -- mobile robots -- robot coordination -- robot control -- motion planning -- virtual structure -- leader following -- robot tracking -- tracking control -- virtual robots -- singularities -- collision avoidance -- robot trajectories -- feedback control -- group formation; Automation -- Periodicals; Control theory -- Periodicals; Automatic control -- Periodicals; Robots -- Periodicals; Bionics -- Periodicals; Intelligent control systems -- Periodicals
• Languages: English
• ISSNs: 1740-7516

Abstract

Coordination of a group of mobile robots in desired formations requires an integration of motion planning and control strategies subject to communication bandwidth limitations. An architecture combining virtual structure and leader following techniques is proposed in this paper. The robots are initialised using a new Virtual Robot (VR) tracking and l-l control framework to establish an arbitrary formation without singularities involved and inter-robot collision. Path planning is performed using the modified A* search, coupled with a proposed smoothing technique to generate feasible trajectories with mobile robots, dynamic and kinematic constraints taken into account. Safe trajectories are obtained based on the predefined formation configuration and the given workspace, where obstacles are avoided by adjusting robot trajectories or by changing formation of the robots appropriately. To accommodate the restriction in information exchange, a decentralised approach is proposed to implement the global feedback controller for the formation by using linear functional observers. The proposed architecture is tested through simulation and experiments to verify its validity.