关键词: 航空发动机;鲁棒控制;零点配置/回路传函恢复+;Kalman滤波器+;稳定性

Abstract: Zero Placement /Loop Transfer Recovery(ZP/LTR) method has better mid-frequency property than LQG/LTR method.But the closed loop stability of ZP/LTR method is not guaranteed.This was a great shortcoming of this method that restricted its application.To overcome this shortcoming,an improvement to the ZP/LTR method was introduced.The key part of this improvement was due to a Kalman Filter introduced.With some specially chosen parameters,the Kalman Filter could approximate and finally be substituted for the target feedback loop(TFL) of the original ZP/LTR method.Therefore,with the Kalman Filter as TFL,the improved ZP/LTR method would have similar performance as the original ZP/LTR method.On the other hand,it was proved that,with the specially chosen parameters,the Kalman Filter(as TFL) was stable.According to the separation principle,the resulted closed-loop system was also stable.This is the stability guarantee of the improved ZP/LTR method.Finally,an example was given in this paper.

Key words: Aircraft engine;Robust control;ZP/LTR~+;Kalman filter~+;Stability