桨根弹性约束刚度对无人直升机飞行品质影响

基于美国陆军航空设计标准ADS-33E-PRF，从稳定性、操纵性和轴间耦合3个方面，对“跷跷板”式旋翼桨榖加装弹性支承件后的“翼扇涵体”无人直升机进行飞行品质评价。简要介绍了样例无人直升机的飞行动力学模型；结合无人直升机的飞行操纵特点，对ADS-33E-PRF中有关稳定性、操纵性和轴间耦合的内容做了适应性剪裁；以旋翼桨根加装了弹性支承件的样例直升机为例，计算不同弹性约束刚度下的配平特性和飞行品质参数，结合飞行品质评价方法，对样例无人直升机的飞行品质进行评价和比较分析。结果表明:桨根弹性约束刚度对飞行品质中的稳定性、操纵性和轴间耦合3个方面均有影响，并且刚度系数取1左右比较合适。 

Effect of elastic restriction stiffness of blade root on flying qualities of unmanned helicopter

The flying qualities of the seesaw ducted fan configurational unmanned helicopter with an elastic support on the hub was evaluated for the stability,maneuverability and inter-axis coupling based on the U.S.army's aviation design standard ADS-33E-PRF.The flight dynamic model of the sample unmanned helicopter was introduced.The stability,maneuverability and inter-axis coupling in ADS-33E-PRF were pruned applicably based on the flight control characteristics of unmanned helicopter.By taking the sample helicopter with elastically supported blade roots as an example,the characteristics in trimming and flying qualities parameters of different stiffness of elastic restriction were computed,and the flying qualities of the sample unmanned helicopter were evaluated,compared and analyzed based on the flying quality evaluation methods.The comparative and analytical results show that the sta bility,maneuverability and inter-axis coupling of flying qualities are all influenced by the stiffness of elastic restriction,and the stiffness coefficient about 1 is more appropriate.