关键词: 反作用控制系统;推力器;故障检测;故障诊断

Abstract: According to external measurable attitude information,a novel failure detection and diagnosis(FDD) scheme for nonlinear system was developed for the identification of thrusters′ open failure and close failure in Reaction Control System(RCS)by means of Strong Tracking Filter(STF) and Multi Model Predictor(MMP).In the close failure case,fault amplitued can be directly acquired using the modified STF in real time.According to the estimated failure,a Modified Bayes′ Decision Law was proposed to lessen alarm delay.In addition,based on the fault direction,the failed thruster was isolated.In the open failure case a novel MMP approach which can attract failure information from occasionally appearing effect and at the same time achieve the reconfiguration of the estimated state under the failure was presented.Finally the proposed approach was used in RCS of a spacecraft and the efficacy of the FDD scheme was shown

Key words: Reaction control system;Thruster;Fault detection;Fault diagnosis