试飞确定电传飞控系统稳定裕度

The Determination of Fly by Wire Flight Control System Stability Margin in Flight Test

根据飞控系统稳定裕度的要求，给出了几种求取稳定裕度的方法，尤其是提出的基于返回误差阵奇异值的稳定裕度判定方法，可解决多通道多回路复杂交联系统的稳定裕度评价问题。并就各种方法的基本环节——频率扫描确定开环／闭环系统频率响应的具体方法，通过ＢＷ－１变稳机人工手动扫频和试验信号发生器不同位置扫频激励试飞进行了验证，结果是正确的，从而确保了各种测取稳定裕度方法的有效可行。

Based on the requirements for flight control system stability margin. Especially a new method, derived from the minimum singular value concepts of return difference matrix (RDM), can be applied to the flight validation of multi channel/loop complex system stability. Furthermore, basic element determining open /close loop system frequency response by using frequency sweep technique, involved in a variety of methods, is fully verified to be correct, through both manual and automatic frequency sweep at different input position in the control loop with BW 1 variable stability aircraft. So that the various methods of measuring stability margin are ensured to be effective and feasible.