Fault diagnosis for hydraulic actuator of a turbofan control system based on PCA

Hydraulic actuator system is one part of turbofan system. The health of this part is of great significance to the operational safety of an aero-engine. Recently with the development of a full authority digital electronic control system (FADEC), the state statistics of fuel control system's core organs have been recorded by the computer, thus provide a basis for a data driven fault diagnosis method. This paper uses simulation software AMEsim to model a hydraulic actuator loop in both normal and abnormal conditions! Then based on a data driven fault diagnosis method-principal component analysis (PCA), a PCA model is built. Finally, using the data obtained from the AMEsim model, the effectiveness of method based on PCA is verified.