Airplane cable fault locating device

Abstract

The invention provides an aircraft cable fault location device, comprising a data processing unit, a trigger control unit, a UWB narrow pulse generating unit, a signal conditioning unit, a delay unit, a data acquisition unit and a CAN interface unit; the UWB narrow pulse generating unit Utilizing the avalanche switching characteristics of the microwave transistor working in the avalanche area, combined with the basic working principle of the MARX circuit, a narrow pulse transmitting signal with ns level rising edge is generated and sent to the cable to be tested. The invention utilizes the low-voltage pulse reflection method to inject narrow-band pulses into the cable to be tested, adopts equivalent sampling to collect the pulse echo signal, and processes the collected data through DSP to realize fast and accurate positioning of the fault point of the cable to be tested, so as to reduce maintenance work The number of wrong disassembly and assembly in the cable can avoid the reduction of cable life due to wrong disassembly and assembly, and it will not be disturbed by environmental noise.

Description

technical field [0001] The invention relates to the field of non-destructive detection of aeronautical engineering fault diagnosis, in particular to an aircraft cable fault location device. Background technique [0002] Aircraft cable fault location is an important part of aircraft maintenance. The types of aircraft cables are complex, including various radio frequency lines, data lines, low-voltage power lines, etc., and the length of the cables is relatively short, which spreads all over the aircraft like "blood vessels", and is often placed in bundles by category in the clamping wall of the aircraft , It is very inconvenient to manually judge the fault point. At present, the special testing equipment used for locomotive maintenance mainly adopts imported time-domain reflectometers. This kind of equipment has strong limitations and is mainly effective for radio frequency coaxial cables. It is expensive. Only a few large-scale maintenance bases in China have such measuring...

AI Technical Summary

Problems solved by technology

The bridge method cannot directly detect high-resistance faults, and it is easy to damage the cable under test when measuring high-resistance faults; a type of method based on flashover is generally used for high-resistance fault detection, and is not suitable for short-circuit fault location; acoustic measurement method and acoustomagnetic synchronization method susceptible to ambient noise

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