飞翼布局无人机着舰飞行动力学分析

Analysis of the Flight Dynamic During Flying Wing UAV Carrier Landing

飞翼布局无人机具有独特的气动特性,研究飞翼布局无人机着舰飞行动力学特性对设计无人机着舰控制律具有重要意义。针对飞翼布局无人机着舰下滑飞行过程,建立六自由度飞行动力学模型,并通过对着舰飞行轨迹稳定性的分析,根据飞行品质对飞行轨迹稳定性的约束,计算达到一级飞行品质要求的着舰飞行速度。通过配平计算和小扰动线性化处理,得到无人机着舰下滑运动线性模型,并分析无人机纵向和横航向的固有模态特性。结果表明,飞翼无人机着舰下滑过程中,纵向的长、短周期模态及横航向的滚转和螺旋模态收敛但收敛慢,荷兰滚模态发散。

Flying wing UAV has distinct aerodynamic characteristic. It＇ s of great significance to research the flight dynam- ic character for the design of control law during the carrier-landing of flying wing UAV. A six-degree-of-freedom flight dynamic model of flying wing UAV carrier landing was presented. Based on the analysis of the flight stability of the UAV gliding, the range of approaching velocity achieving flight quality of first-class level was calculated, according to the re- quirement of the flight quality to the flight stability. Through the trim calculation and small perturbation linearization, the linear model of UAV gliding motion was obtained. The longitudinal and lateral-directional modal properties were ana- lyzed. Results showed that during the flying wing UAV gliding, the longitudinal long-periodic and short-periodic mode and the lateral-directional roll and spiral mode became convergent slowly, but the dutch roll mode was divergent.