航空发动机零点配置/回路传函恢复方法的改进

为了对零点配置／回路传函恢复（ZP／LTR）方法无法保证闭环系统稳定性的缺陷进行改进，在设计过程中引入了Kalman滤波器，通过选取特殊的参数，使Kalman滤波器回路逼近并取代原目标回路，从而在保留ZP／LTR方法性能的同时，通过保证Kalman滤波器回路的稳定性保证了最后闭环系统的稳定性。研究还证明了如果按文中方法选取参数，则所得的Kalman滤波器回路是稳定的，从而最终保证了闭环系统的稳定性。最后的实例验证了所得的结论。

Improved zero placement/loop transfer recovery method in aeroengine control systems

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.