Development Of Aero-engine Real-time Monitoring And Fault Diagnosis System Based On Embedded

The air-engines with high failure rate owe to working in high temperature,high-pressure environment for long time.A variety of advanced sensors with useful algorithms and intelligent models can be used to monitor and diagnose the performance status of air-engine,in order to realize the engine health management and guarantee continuous airworthiness of the aircraft.The embedded technology has the advantages of strong real-time performance,high stability and small portability,and can be applied to aero-engine monitoring and diagnosis system,which can reduce the cost of monitoring and diagnosing equipment and realize the system airborne.Therefore,it has important theoretical and practical significance to develop embedded real-time monitoring and fault diagnosis of aero-engine system.Compared with the traditional monitoring technology,the electrostatic monitoring technology has the advantages of strong real-time and good continuity,and can realize the continuous monitoring of the charge level of the aero-engine.Therefore,this paper selected the electrostatic sensor as the front-end component of the system to provide the status data for the subsequent diagnosis.Based on the analysis of the principle of electrostatic sensor,the equivalent model of sensor was established and a new built-in conditioning circuit was designed.By selecting the time-domain characterization parameters of electrostatic signals,studies of electrostatic baseline and fault mode identification based on SVM were carried out as the theoretical basis of fault diagnosis.The data acquisition module based on coprocessor was designed to receive the data transmitted from the front-end sensor,accomplish the signal conditioning and transformation,and realize the communication with the terminal display and diagnosis module.The Feiling OK6410 development board was selected to build the operating system platform and design the terminal display and diagnostic application to realize the real-time display of the collected signals,data storage and fault diagnosis functions with the touch screen.Finally,the hardware and software of the system were tested and the typical fault simulation experiments of aero-engine were carried out to verify the system monitoring and diagnosis function.In order to achieve further airborne,the relevant airworthiness regulations and reference relevant industry standards were summarized,and the airworthiness certification process of the system was sorted out in the end of this paper.