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has been cited by the following article:

• TITLE: Load Disturbance Conditions for Current Error Feedback and Past Error Feedforward State-Feedback Iterative Learning Control

  AUTHORS: Athari Alotaibi, Asmaa Alkandri, Muhammad Alsubaie

  KEYWORDS: Iterative Learning Control, Disturbance Conditions, Singular Values

  JOURNAL NAME: Intelligent Control and Automation, Vol.12 No.2, May 25, 2021

  ABSTRACT: Iterative learning control is a controlling tool developed to overcome periodic disturbances acting on repetitive systems. State-feedback ILC controller was designed based on the use of the small gain theorem. Stability conditions were reported in the case of past error and current error feedback schemes based on Singular values. Disturbances acting on the load of the system were reported for the case of past error feedforward only which kept the investigation of the current error feedback as an open question. This paper develops a comparison between the past error feedforward and current error feedback schemes disturbance conditions in singular values. As a result, the conditions found highly support the use of the past error over the current error feedback.