MIMO Frequency Domain Iterative Tuning for Tracking Control

A new ’model-free’ iterative controller tuning method is presented for multiple-input multiple output control systems based estimation algorithms in the frequency domain. The method relies on efficient computation of the negative gradient of the controller cost function in the frequency domain. Only one experiment is used per iteration and the method is therefore suitable for realtime implementation by periodic adjustments of the controller. Both feedback and/or feed-forward controllers can be tuned. Primary target application areas can be self-tuning feedforward/feedback controllers in industry where the reference signals are periodic.