Method for realizing weak fault diagnosis and location of airplane wire by utilizing local mean decomposition

Abstract

The invention provides a method for realizing weak fault diagnosis and location of an airplane wire by utilizing local mean decomposition. The method comprises the following steps of: connecting the airplane wire with a time domain reflectometer by an aviation plug; denoising the time domain reflected signal obtained by the time domain reflectometer from the tested wire; carrying out local mean decomposition on the denoised time domain reflected signal to obtain time frequency distribution of the time domain reflected signal; analyzing instantaneous frequency changes of the fault positions by utilizing the time frequency distribution, obtained after local mean decomposition, of the time domain reflected signal; analyzing instantaneous frequency changes of the wire with weak faults after diagnosis by utilizing the time frequency distribution, obtained after local mean decomposition, of the time domain reflected signal to obtain the positions of the weak faults in the wire; and comprehensively analyzing the weak fault diagnosis results of the airplane wire, and analyzing the detection speed and detecting the precision parameters. The method has the following beneficial effect that: the time domain reflectometer is utilized to detect the weak faults of the wire, so the weak fault detection rate is high and the weak fault false alarm rate is low.

Description

technical field [0001] The invention relates to a method for diagnosing and locating weak faults of aircraft wires. In particular, it relates to a method for diagnosing and locating weak faults of aircraft wires by using local mean value decomposition. Background technique [0002] Aircraft wires are important devices that provide power and control signals for aircraft electronic systems, and are widely distributed in various types of aircraft. With the growth of aircraft age, aircraft wires work in a complex environment for a long time, and are prone to failures such as insulation layer wear, aging, and corrosion, which eventually lead to short circuits and open circuits of aircraft wires, burying hidden dangers for aircraft safety. It can be seen that whether the aircraft wire can work well under normal working conditions will directly affect the safety of aircraft flight. Among the existing fault detection methods of aircraft wires, the time domain reflection detection ...

AI Technical Summary

Problems solved by technology

Although the time domain reflection method has a good effect on detecting the short circuit and open circuit of the wire, the effect of detecting weak faults such as wear and wrinkles in the fault of the wire is not obvious

Because the reflection signals obtained by the time domain reflectometer for faults such as wear and wrinkles change weakly in the time domain, it is difficult to directly diagnose and locate weak faults in the time domain

At the same time, because the fault location of the time domain reflection method is realized by calculating the time difference between the reflected signal and the reference signal, and in a normal test environment, it is difficult to accurately judge the position of the rising edge and falling edge of the pulse signal, resulting in the time domain diagnosis method. The test accuracy is low

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