不同失稳模态下倾转旋翼机回转颤振参数敏感性对比研究OA

To address the core challenge of whirl flutter severely limiting the high-speed flight capability of tiltrotor air-craft and to overcome the analytical inaccuracies of traditional rigid rotor theory,a coupled rotor-pylon-wing aeroelastic dynamics model based on finite volume beam theory and multibody dynamics is established,specifically for the refined analysis of the whirl flutter problem.The core innovation of this research lies in the first systematic comparative study of two baseline configurations with distinct instability mechanisms within the same framework:the Bell model,prone to wing-mode instability,and the MTR model,prone to rotor-mode instability.The influence of key design parameters such as pitch-flap coupling angle,pylon mass,rotor mast height,and wing stiffness on the whirl flutter stability bound-ary is investigated.The results demonstrate that the influence of the same design parameter on the whirl flutter boundary speed varies significantly across different baseline configurations.For instance,an increase in pylon mass leads to oppo-site trends in stability for the two configurations.This indicates that the optimization strategy for improving whirl flutter stability is highly configuration-dependent.This research not only provides a high-fidelity theoretical tool for tiltrotor aircraft whirl flutter analysis,but also offers a clear and targeted theoretical basis for the aeroelastic optimization of dif-ferent configurations through innovative comparative analysis.