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Reference trajectory modification based on spatial iterative learning for contour control of 2-axis NC systems
journal contribution
posted on 2023-06-09, 20:40 authored by Jiangang Li, Yiming Wang, Yanan LiYanan Li, Wenshu LuoContour error is a main factor that affects the quality of products in numerical control (NC) machining. This paper presents a contour control strategy based on digital curves for high-precision control of computer numerical control (CNC) machines. A contour error estimation algorithm is presented for digital curves based on a geometrical method. The dynamic model of the motion control system is transformed from time domain to space domain because the contour error is dependent on space instead of time. Spatial iterative learning control (sILC) is developed to reduce the contour error, by modifying the reference trajectory in the form of G code. This allows system improvement without interference of low-level controllers so it is applicable to many commercial controllers where interpolators and feed-drive controllers cannot be altered. The effectiveness of this method is verified by experiments on a NC machine, which have shown good performance not only for smooth trajectories but also for large curvature trajectories.
History
Publication status
- Published
File Version
- Accepted version
Journal
IEEE/ASME Transactions on MechatronicsISSN
1083-4435Publisher
Institute of Electrical and Electronics EngineersExternal DOI
Issue
3Volume
25Page range
1266-1275Department affiliated with
- Engineering and Design Publications
Notes
This research is supported by National Key R&D Program of China under grant number 2019YFB1703700 and National Natural Science Foundation of China under grant number U1913213.Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-02-19First Open Access (FOA) Date
2020-02-19First Compliant Deposit (FCD) Date
2020-02-18Usage metrics
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