Papers by Author: Zhao Hui Ji

Abstract: Ni/Graphite seal coating was fabricated by flame spraying technology and the effect of oxygen pressure, the powder feeding rate and spraying distance on the coating hardness was investigated base on the orthogonal regression experimental design method. Analysis of orthogonal calculation results suggest that powder feeding rate is the key spraying influential factor valuing 140.884 which affects coating hardness; both oxygen pressure and spraying distance can be considered as secondary factors; the analysis of cross-sectional microstructure shows that the coating hardness value increases with the increase of graphite content; during coating deposition process, the content of graphite in the coating will change when adjusting the flame spraying parameters, which furthermore leads to that the coating hardness changes with variation of flame spraying parameters

Abstract: Engine fuel flow is one of the most important parameters of aero-engine performance, which can accurately reflect the actual condition of aero-engine. It'is possible to monitor the aero-engine fuel flow (FF) by reading the data of QAR (Quick Access Recorder). However, it's difficult to monitor the actual condition of aero-engine through the traditional method because of the vast amount of QAR data and the complexity of the engine itself. Feed forward process neural network is adopted to monitor the QAR-based aero-engine fuel flow . The results of the simulation are acceptable and show that the Neural Net model is an effective method to monitor aero-engine conditions.