Pre-compensation of servo tracking errors through data-based reference trajectory modification |
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Authors: | Alper Dumanli Burak Sencer |
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Affiliation: | Oregon State University, Corvallis, USA |
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Abstract: | This paper presents a new dynamic error compensation approach with novel data-based closed-loop tuning scheme to enhance tracking accuracy of machine tool feed-drives. Both servo dynamics and friction disturbance induced positioning errors are pre-compensated by modifying the reference trajectory. Velocity and acceleration profiles of reference trajectory are modulated to achieve perfect tracking. Reference position profile is modified based on the pre-sliding friction regime to eliminate quadrant glitches. Optimal error compensation is achieved by a digital trajectory pre-filter whose parameters are tuned automatically by making on-the-fly iterative adjustments. Effectiveness of proposed compensation approach is validated experimentally in multi-axis feed-drive systems. |
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Keywords: | Corresponding author Identification Compensation Feed-drive |
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