Control of Pitch-Flap Instabilities in Helicopter Rotors using Delayed Feedback

TL;DR

This paper explores how delayed feedback can be used to stabilize helicopter rotor vibrations, providing new analytical insights and numerical evidence specifically for hovering flight conditions.

Contribution

It introduces an improved analysis method for using delay as a stabilization tool in helicopter rotor vibration control, advancing previous strategies.

Findings

Delay can effectively stabilize rotor vibrations.

Mathematical tools provide new insights into delay-based stabilization.

Numerical simulations support the proposed approach.

Abstract

The problem of vibration suppression in helicopter rotors is the main topic of this paper. We revisit a strategy for the stabilization of such systems based on delayed feedback. By means of an improved analysis, made possible by recently developed mathematical tools, we present insights on how the delay can be used as stabilization tool for this problem. The results are supported with numerical simulations. For simplicity, only the case of hovering flight is considered.