摘要
连接翼布局是高空长航时探测无人机的适宜布局之一。以某大展弦比连接翼布局为例,研究其前/后翼飞行控制特性,包括在纵向姿态和轨迹控制中单独使用前、后翼升降舵的特性和直接升力控制中的协调使用特性。结果表明,虽然定性而言前翼控制对于轨迹响应时间延迟降低有利,但由于内在的慢响应特性,单独前、后翼升降舵控制效果相当;前/后翼协调使用有利于消除俯仰姿态和轨迹的耦合影响,能够有效调整闭环系统零极点,从而调节时间明显缩短;另外,基于输出反馈的特征结构配置方法适宜于直接升力控制律设计,过程直接,得到的结果易实现。这些结果为连接翼飞机飞行控制律设计建立了基础。
The joined-wing configuration is one of the good options for high altitude and long endurance unmanned aerial vehicles. Based on a high aspect-to-chord ratio joined-wing configuration, the flight control features of the forward-/rear-wing elevators were investigated, with both the independent use of forward- or rear-wing elevator and the direct lift control coordination being evaluated for the longitudinal attitude and path control. It is shown that the forward-wing elevator scheme and rear-wing elevator scheme are quantitatively comparable due to the innate slow settle-down nature, in spite that the forward-wing elevator scheme tends to be qualitatively better in terms of the time delay in the path response; also that the coordinated use of the forward- and rear-wing elevators is favorable for the decoupling of the pitch attitude and flight path, with both the closed-loop zeros and poles being adjustable as required, and the response transient settled down quickly; moreover, the eigenstructure assignment by output feedback technique can be utilized in the direct lift control law design, with design simplicity and realization possibility. These resuits give insight for the flight control law design of the joined-wing aircraft.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2008年第B05期91-96,共6页
Acta Aeronautica et Astronautica Sinica
关键词
连接翼布局
前/后翼升降舵
纵向控制
直接力控制
特征结构配置
joined-wing configuration
forward-/rear-wing elevator
longitudinal control
direct force control
eigenstructure assignment
