{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,3,2]],"date-time":"2025-03-02T05:23:21Z","timestamp":1740893001586,"version":"3.38.0"},"reference-count":30,"publisher":"SAGE Publications","issue":"6","license":[{"start":{"date-parts":[[2019,9,16]],"date-time":"2019-09-16T00:00:00Z","timestamp":1568592000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100013076","name":"national major science and technology projects of china","doi-asserted-by":"publisher","award":["2017ZX02102004"],"award-info":[{"award-number":["2017ZX02102004"]}],"id":[{"id":"10.13039\/501100013076","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51805496"],"award-info":[{"award-number":["51805496"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering"],"published-print":{"date-parts":[[2020,7]]},"abstract":"<jats:p> Rational basis functions are introduced into iterative learning control to enhance the flexibility towards nonrepeating tasks. At present, the application of rational basis functions either suffers from nonconvex optimization problem or requires the predefinition of poles, which restricts the achievable performance. In this article, a new data-driven rational feedforward tuning approach is developed, in which convex optimization is realized without predefining the poles. Specifically, the optimal parameter which eliminates the reference-induced error is directly solved using the least square method. No parametric model is involved in the parameter tuning process and the optimal parameter is estimated using the measured data. In the noisy condition, it is proved that the estimated optimal parameter is unbiased and the estimation accuracy in terms of variance is analysed. The performance of the proposed approach is tested on an ultraprecision wafer stage. The experimental results confirm that high performance is achieved using the proposed approach. <\/jats:p>","DOI":"10.1177\/0959651819874563","type":"journal-article","created":{"date-parts":[[2019,9,16]],"date-time":"2019-09-16T07:02:35Z","timestamp":1568617355000},"page":"748-758","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Data-driven rational feedforward tuning: With application to an ultraprecision wafer stage"],"prefix":"10.1177","volume":"234","author":[{"given":"Weicai","family":"Huang","sequence":"first","affiliation":[{"name":"State Key Lab of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China"},{"name":"Beijing Key Lab of Precision\/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing, P.R. 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