A prediction model for the quantitative description of wire fray fault

The fray fault of the aircraft wire is common,but it considered difficult to be detected. Now it would be a serious threat to the safety of the aircraft. As the flight of the aircraft, the fray fault can be more and more serious and it would become open or short circuit at last. If the wire fault degree can be detected accurately, it will make important significance to life prediction of wire. A quantitative detection method for wire fray fault is brought out in this paper. Characteristic impedance is selected for describing wire fray fault by theoretically analysis. Simulation model of wire damage is presented and the quantitative relationship between characteristic impedance and wire damage is calculated by FEM analysis. The rule of characteristic impedance changing over time is obtained according to the data gained from the friction-wear test. The result shows that the characteristic impedance of wire increases linearly with time. The proposed method is beneficial for quantitative detection for wire fray fault and prediction for the remaining life.