Modeling and simulation of aero-hydraulic pump wear failure

The aircraft hydraulic system has a significant impact on the safety of modern civil aviation. The wear of the hydraulic pump is the main cause for the performance degradation of the aircraft hydraulic system. In this paper, changing of oil return flow in hydraulic system under the wear condition of slipper and cylinder bore is studied. Firstly, the factor and mechanism of the degradation of the hydraulic system which caused by wear are analyzed. Then the degradation model is established by the co-simulation of Simulink and AMESim. Finally, multi-step support vector machine (SVM) algorithm is adopted to predict the failure of the aero-hydraulic pump and the remaining useful life (RUL) of the system. The results show the accuracy and effectiveness of the established wear model.