Comments on "Robust optimal design and convergence properties analysis of iterative learning control approaches" and "On the P-type and Newton-type ILC schemes for dynamic systems with non-affine input factors"

Schmid R

Automatica, Vol.43, No.9, 1666-1669, 2007

DOI10.1016/j.automatica.2007.02.007 Export Citation

Comments on "Robust optimal design and convergence properties analysis of iterative learning control approaches" and "On the P-type and Newton-type ILC schemes for dynamic systems with non-affine input factors"

Schmid R

The papers by Xu and Tan [Robust optimal design and convergence properties analysis of iterative learning control approaches, Automatica 38 (2002) 1867-1880], and Xu and Tan [On the P-type and Newton-type ILC schemes for dynamic systems with non-affine input factors, Automatica 38 (2002) 1237-1242], give a convergence analysis for several iterative learning control approaches. Unfortunately, these papers contains several mathematical errors that render the proofs of the claimed results invalid. As there are no obvious ways to correct these errors, the results presented in these papers are questionable. (C) 2007 Elsevier Ltd. All rights reserved.

Keywords:iterative learning control;higher order ILC scheme;P-type ILC scheme;newton type ILC scheme;Q-factor