变转速倾转旋翼机多体系统气弹响应分析

Multi-body aeroelastic analysis of til trotor with varying rotor rotational speed

基于多体动力学方法建立了考虑机翼/旋翼刚柔耦合的倾转旋翼机过渡状态气弹响应分析模型,通过引入倾转过程旋翼尾迹弯曲影响,修正了直升机旋翼常规动态入流模型.集成非定常动态入流方程与倾转过渡状态的多体动力学方程,建立了倾转旋翼机过渡状态下时域非定常耦合分析模型.以半展长弹性机翼全铰接式倾转旋翼机模型为例,分析了倾转旋翼机倾转过渡状态气弹响应时间历程.数值计算表明:建立的时域模型能够快速有效分析了倾转旋翼机过渡状态的气弹特性,能够捕捉变转速倾转旋翼机的机翼/旋翼间复杂的气弹耦合特性.

This paper focuses on the implementation of multibody analysis for the real - time aeroelastic coupling simulation of a tiltrotor during transition flight with varying rotor rotational speed. The effects of rotor wake curvature on induced velocity are considered to improve the dynamic inflow model of a tiltrotor during transition flight. The muhibody dynamic differential equations are combined with the equations of the unsteady dynamic inflow model to attain the complete real - time nonlinear and unsteady aeroelastic coupling model of a tihrotor during transition flight. The aeroelastic coupling responses of the tihrotor during transition flight are calculated aiming at semispan soft in plane tihrotor models with elastic wings. The numerical simulations demonstrate that the real - time analytical model derived in this paper has the capacity to capture the complexity of a rotor/wing aeroelastic coupling response of a tiltrotor during transition flight with varying rotor rotational speed.