连接翼布局纵向控制特性

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。

Longitudinal Control Features of Joined-wing Configuration

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 tech-nique can be utilized in the direct lift control law design,with design simplicity and realization possibility.These re-sults give insight for the flight control law design of the joined-wing aircraft.