Fluctuating Harmonic Control Algorithm For Active Vibration Control Of Helicopter Fuselage

Abstract

Active vibration control (AVC) has been successfully applied to reduce helicopter fuselage harmonic vibrations. The frequency domain algorithms widely used in the AVC owing to their simplicity, strong robustness, and ease of implementation. Although these frequency-domain methods efficiently suppress steady-state fuselage vibrations, their AVC performance degrades significantly under conditions of time-varying rotor loads. This paper introduces a novel Fluctuating Harmonic Control (FHC) algorithm designed to achieve rapid convergence and maintain high control effectiveness for helicopter fuselage AVC under time-varying loads. The principles of FHC are introduced, and its robustness and convergence speed are analyzed. Comparative simulations of a helicopter fuselage structure subjected to several time-varying rotor loads were conducted employing FHC and traditional algorithms, demonstrating that FHC exhibits better vibration environment tracking capability and achieves superior control performance under time-varying vibration conditions.