分布式旋翼飞行器耦合动特性参数影响研究

Study on Coupling Dynamic Characteristics and Parameter Influence of Multi-tiltrotor Aircraft

为探索不同参数对分布式旋翼飞行器动特性的影响机制,采用Hamilton原理和中等变形梁理论推导了分布式旋翼/短舱/机翼耦合结构动力学方程,建立了适用于耦合动特性分析的求解方法,计算了旋翼/短舱/机翼耦合模态,结果对比误差小于5%,表明本文建立的计算方法是准确有效的。在此基础上研究了旋翼线密度、短舱高度、旋翼转速、安装位置参数对耦合动特性的影响,得出一些结论规律:分布式旋翼飞行器的短舱长度增加时,机翼模态将整体减小;旋翼、机翼模态频率同时受到旋翼线密度的影响;分布式旋翼安装位置向翼尖移动时,机翼扭转频率明显变小。本文结论可为分布式旋翼飞行器设计提供参考。

In order to explore the influence mechanism of different parameters on multi-rotor aircraft dynamic characteristics,Hamilton principle and the theory of medium deformation beam are used to derive the rotors/nacelle/wing coupling structure dynamic equation,and a solution method suitable for the analysis of coupled dynamic characteristics is established.By using literature as an example calculate rotor/nacelle/wing coupling frequency,the error is less than 5%compared with the experimental results in the literature,indicating that the coupling model in this paper is accurate and effective.On this basis,the influences of rotor mass,nacelle length,rotor speed,spanwise position on the coupling dynamic characteristics are studied,the typical frequencies and vibration patterns of rotor and wing are calculated and analyzed,the respective parameter influence curves are drawn,and some meaningful conclusions and parameter influence laws are obtained,which provides reference for the design of distributed rotorcraft.