倾转旋翼/机翼耦合系统过渡飞行瞬态响应分析

Transient Response Analysis of Rotor/Wing Coupled During Tiltrotor Transition Flight

基于多体动力学方法建立倾转旋翼机过渡飞行瞬态响应分析模型,研究过渡飞行状态下倾转旋翼机非线性非定常气弹耦合动力学特性;通过引入倾转过程旋翼尾迹弯曲影响,修正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飞行的多体动力学方程,建立倾转旋翼机过渡飞行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,分析倾转旋翼机倾转过渡飞行瞬态响应时间历程。数值计算表明:本文建立的时域模型能够快速有效分析倾转旋翼机在过渡飞行时的瞬态特性,能够反映倾转旋翼机旋翼/机翼间复杂的气弹耦合动力学关系。

A time domain analytical model of the transient response of the tiltrotor during the transition flight is described. Motion equations based on the multi-body analysis are derived. Effects of the rotor wake curvature on the induced velocity are considered to improve the dynamic inflow model of tiltrotor during transition flight. Multi-body dynamic differential equations are combined with equations of the unsteady dynamic inflow model to get the complete time domain unsteady coupling analytical model of the tiltrotor during the transition flight. Transient responses of the tiltrotor during the transition flight are calculated aiming at semispan soft-in-plane tiltrotor models with the elastic wing. Numerical simulations demonstrate that the derived time domain analytical model has an ability to capture rotor/wing coupled transient characteristics of the tiltrotor during the transition flight.