Post-critical analysis of ground resonance phenomenon: effect of stator asymmetry
Résumé
In helicopter with hinged rotor, an unstable dynamic phenomenon known as ground resonance may occur, leading to the total destruction of the aircraft. The prediction of the stability boundary has been addressed for various helicopter configurations by using different methods. However, in order to develop control strategies for this phenomenon, the post-critical behavior of the system needs to be known. In this paper, the post-critical behavior of the ground resonance instability is investigated. For this purpose, the behavior of a helicopter with four identical hinged blades is investigated and fuselage asymmetry is taken into account. It is shown that, due to fuselage asymmetry, in addition to periodic solutions the system may exhibit quasiperiodic and chaotic response.