多变量飞控系统稳定裕度与品质关系的研究

 采用系统回差阵的最小奇异值结合通用幅值－相角估算图的方法，研究了多变量系统的稳定裕度与品质间的关系问题。结果表明：量测阵Ｌ置于被控对象的输入、输出端时所得到的稳定裕度有很大差异；当量测阵Ｌ置于输出端时，估算出的稳定裕度大致反映了系统的品质，二者之间有类似于单变量系统的稳定裕度与系统品质间的关系。

STUDY OF THE RELATIONSHIP BETWEEN STABILITY MARGINS AND QUALITY OF MULTIVARIABLE FLIGHT CONTROL SYSTEMS

In this paper, using the minimum singular value of the system return difference matrix and universal gain phase margin diagram, the relations between stability margins and the system quality of multivariable flight control systems have been studied. The results indicate that the stability margins are different when L is introduced at the plant input and output. When L is introduced at the plant input, the result of system robustness is equal to that of structure singular value analysis and when L is introduced at the plant output, the result is equal to that of complement sensitivity singular value analysis. The stability margins evaluated by introducing L at the plant output probably reflect the system quality and the relation between them is the same as that of SISO system.