2018, Volume 4, Issue 4
Engineering >> 2018, Volume 4, Issue 4 doi: 10.1016/j.eng.2018.07.013
Control of Velocity-Constrained Stepper Motor-Driven Hilare Robot for Waypoint Navigation
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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Abstract
Finding an optimal trajectory from an initial point to a final point through closely packed obstacles, and controlling a Hilare robot through this trajectory, are challenging tasks. To serve this purpose, path planners and trajectory-tracking controllers are usually included in a control loop. This paper highlights the implementation of a trajectory-tracking controller on a stepper motor-driven Hilare robot, with a trajectory that is described as a set of waypoints. The controller was designed to handle discrete waypoints with directional discontinuity and to consider different constraints on the actuator velocity. The control parameters were tuned with the help of multi-objective particle swarm optimization to minimize the average cross-track error and average linear velocity error of the mobile robot when tracking a predefined trajectory. Experiments were conducted to control the mobile robot from a start position to a destination position along a trajectory described by the waypoints. Experimental results for tracking the trajectory generated by a path planner and the trajectory specified by a user are also demonstrated. Experiments conducted on the mobile robot validate the effectiveness of the proposed strategy for tracking different types of trajectories.
Keywords
Trajectory tracking ; Adaptive control ; Waypoint navigation ; Hilare robot ; Particle swarm optimization ; Probabilistic road map
SupplementaryMaterials
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