航空发动机推力估计新方法

摘要

In estimating the thrust of an aircraft engine, the Kalman tracking filter(KTF) exhibits a steady-state error at the off-design point.To deal with this problem, we propose a thrust estimator based on the controller tracking filter(CTF).A subset of aircraft engine's health parameters are selected as the controlled parameters.The degradation of the controlled parameters are estimated and used to correct the onboard real time engine model, to make the onboard model outputs follow the real engine's measurable parameters output.This makes it possible to accurately estimate immeasurable performance parameters such as the thrust.Compared with the KTF method, the CTF method takes advantage of the integral characteristic of the controller to eliminate the steady state tracking error at off-design point, and improves the accuracy of thrust estimation.%论文针对采用卡尔曼跟踪滤波方法进行航空发动机推力估计时,在非设计点存在稳态跟踪滤波误差的问题,提出了基于控制器跟踪滤波器的推力估计方法.在航空发动机的健康参数中选择一部分作为"被调"参数,对"被调"参数的蜕化进行估计,并修正机载发动机的实时模型,使模型输出与实际发动机可测参数的输出相一致,达到对推力等不可测性能参数进行准确估计的目的.与卡尔曼跟踪滤波估计方法相比,控制器跟踪滤波方法能利用控制器的积分特性,消除非设计点的稳态跟踪滤波误差,提高推力估计的精度.