REREARCH ON A PROGNOSTIC AND HEALTH MONITORING APPROACH FOR EMAS IN THE FLIGHT CONTROL SYSTEM

摘要

For a more critical use in commercial aircraft, the Electromechanical Actuators(EMAs) technology must prove to be the same level of safety and reliability assystems based on Electrohydrostatic Actuators (EHA) and Hydraulics Actuators(HAs).The use of a Prognostic and Health Monitoring (PHM) is an additional way tosecure the jamming free approach for EMA in flight control system and is becomingrecognized as an efficient strategy for increasing reliability and improvingmaintenance of EMAs in this area.Firstly, does a detailed analysis of the multi-EMA system, and builds the fault treeof system, considering the three aspects of the control unit, electrical equipment andmechanical equipment; secondly, monitors the real state of the EMAs, relying onalready existing sensors and signals, such as motor currents, temperature sensor andposition sensors, according to the presented results, the current and position signalscan provide useful information for monitoring the EMAs; in the end, assesses andforecasts the health status, the failure time, remaining life of the components andsystem, through the fast Fourier transform algorithm and intelligent fuzzy logicmodel(FLM).