In the automated transportation of large aerospace structures, image-based mobile robot tracking of variable-curvature trajectories faced image visibility constraints and steering angular velocity limits. An image-based visual servo control strategy was proposed with a preview mechanism and prescribed performance control. By employing an error transformation function, constrained normalized plane errors were converted into unconstrained errors, and a prescribed performance function was introduced to ensure error convergence within predefined bounds, and maintain the feature point visibility. Meanwhile, combined with a curvature-driven adaptive preview distance model,a “dual-region” feature extraction scheme was developed to anticipate and correct state feedback, effectively suppressing angular velocity spikes. The proposed method was verified through MATLAB/Simulink simulation and physical experiments, the results show that the proposed method effectively constrains errors within prescribed limits, and the integration of the preview mechanism significantly improves the tracking accuracy and motion smoothness of the mobile robots.
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