SAR performance-based fault diagnosis for electrohydraulic control system:A novel FDI framework for closed-loop system  

作　　者：Yang ZHANG Shaoping WANG Jian SHI Xinyu YANG Jiarui ZHANG Xi WANG 

机构地区：[1]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [2]School of Automation Science and Electrical Engineering,Beihang University,Beijing 100191,China [3]Institute for Automatic Control and Complex Systems(AKS),University of Duisburg-Essen,Duisburg 47057,Germany

出　　处：《Chinese Journal of Aeronautics》2022年第10期381-392,共12页中国航空学报（英文版）

基　　金：co-supported by the National Science and Technology Major Project of China(Nos.2017-V-0011-0062,2017-V-0010-0060);National Natural Science Foundation of China(51875014);the Academic Excellence Foundation of BUAA for PhD Students。

摘　　要：Model-based fault diagnosis serves as an efficient and powerful technique in addressing fault detection and isolation(FDI)issues for control systems.However,the standard methods and their modifications still encounter some difficulties in algorithm design and application for complex higher-order systems.To avoid these difficulties,a novel fault diagnosis framework based on multiple performance indicators of closed-loop control system is proposed.Under this framework,a socalled performance residual vector is constructed to measure the differences between the real system and the nominal model in terms of system stability,accuracy,and rapidity(SAR)respectively.The criteria for quantification,normalization of the SAR residuals and the explicit mappings between the thresholds and the required performance are given.FDI can be easily achieved simultaneously by monitoring the normalized residual vector length and direction in the SAR performance residual space.A case study on electro-hydraulic servo control system of turbofan engine is adopted to demonstrate the effectiveness of the proposed method.

关 键 词：Electro-hydraulic servo valve(EHSV) Fault diagnosis Fuel metering unit Performance degradation Performance residual Stability accuracy and rapidity(SAR) 

分 类 号：V263.6[航空宇航科学与技术—航空宇航制造工程]