飞翼气动布局飞机纵向短周期等效系统参数辨识技术研究

Study on Parameter Identification of Longitudinal Short Period Mode Equivalent System for Flying Wing Aircraft

飞翼布局飞机由于其特殊布局形式,飞控系统设计通常采用高增益大阻尼控制增稳方法,同时飞翼布局飞机的操纵面操纵效率非线性显著,涉及多操纵面组合控制以及控制分配,因此,采用常规的杆力或杆位移作为输入指令,多数情况下无法顺利地激励出理想的纵向短周期模态。本文采用迎角指令跟踪法研究飞翼布局飞机的纵向短周期品质,利用Simulink进行创新操纵面布局飞机的闭环仿真系统建模与验证,并通过小型飞翼布局无人机进行飞行试验评估。结果表明,该方法用于飞翼布局飞机纵向短周期品质试飞时,易于激励出其纵向短周期模态,并可实现飞机精确控制。

For the special layout of the flying wing aircraft, the flight control system usually adopts high gain and large damping, and the control surface＇operating efficiency is nonlinear, involving multiple control surfaces combination and assignment. Thus in most case, the ideal longitudinal short period mode can not be excited by the rod or rod displacement as input command. In this paper, the method of attack tracking method was presented to study the longitudinal short period quality of the flying wing aircraft, verifying by modeling of closed-loop simulation system for ICE aircraft using Simulink and the small flying wing UAV＇ s flight test. The result shows the method can control the aircraft accurately and excite the longitudinal short period mode easily.