Research of Hard Fault Diagnosis Simulation Platform of Aero-engine's Key Sensors Based on Neural Network

摘要

The purpose of the research is to establish a fault diagnosis model of the aero-engine's key sensors using the artificial neural networks to replace the engine's mathematical model, so as to establish a hard fault diagnosis simulation platform to monitor the performances of the engine sensors on real-time, to judge the engine failure mode timely, and to locate the fault type of sensors accurately. By analyzing the correlations of the parameters that affect the conditions of the engine, a three-layer BP network model is established. The related QAR (Quick Access Recorder) data are used to simulate and analyze the models using the MATLAB. Combined with the characteristics of the hard failure of the critical engine sensors and the correlation of the parameters, the fault diagnosis simulation platform is established. Then, the parameters of the normal engine and the failure engine are used respectively to evaluate and validate the platform. The simulation results show that the platform can judge the critical sensors' faults of the engine accurately, and can locate the type of sensors reliably.