Chatter reduction in sliding mode tuner controller using skipping surface

TL;DR

This paper proposes a method to reduce chatter in sliding mode tuner controllers by observing the approach rate to the sliding surface, improving performance and reducing mechanical wear.

Contribution

It introduces a novel approach to decrease chatter in minimum seeking sliding mode controllers by monitoring the rate of convergence to the sliding surface.

Findings

Chatter is effectively reduced using the proposed method.

Performance of the tuner controller is improved.

Mechanical wear is minimized due to reduced chatter.

Abstract

TRIUMF ISAC 1 tuning controllers operate using minimum seeking sliding mode controller to minimize the reflected power in their cavities. As with all mini-mum seeking algorithms, chatter present in the control-ler can degrade its performance and cause necessary mechanical wear. By observing the rate at which the minimizing function approaches the sliding surface, it is possible to determine whether a change in direction is necessary, thereby reducing the amount of chatter throughout the minimum seeking process.