In iterative learning control schemes for linear discrete time systems, conditions to guarantee the monotonic convergence of the tracking9 error norms are derived. By using the Markov parameters, it is shown in the time-domain that there exists a non-increasing function such that when the properly chosen constant learning gain is multiplied by this function, the convergence of the tracking error norms is11 monotonic, without resort to high-gain feedback. 2005 Published by Elsevier Ltd.13
Kevin L. Moore, Yangquan Chen, Vikas Bahl