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A Fault Location Method for Aircraft Installed Cables Based on Impedance Characteristics

A technology of impedance characteristics and cable faults, which is applied in the field of fault location of aircraft installed cables based on impedance characteristics, can solve the problems of difficult cable fault location and low efficiency of troubleshooting, and achieve shortened troubleshooting time, fast fault point location, principle simple effect

Active Publication Date: 2022-05-10
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention proposes a fault location method for aircraft installed cables based on impedance characteristics, which can effectively solve the problems of difficult cable fault location and low troubleshooting efficiency

Method used

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  • A Fault Location Method for Aircraft Installed Cables Based on Impedance Characteristics
  • A Fault Location Method for Aircraft Installed Cables Based on Impedance Characteristics
  • A Fault Location Method for Aircraft Installed Cables Based on Impedance Characteristics

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Embodiment 1

[0039] As the basic implementation of the present invention, the present invention includes a method for fault location of aircraft installed cables based on impedance characteristics, comprising the following steps:

[0040] a. Perform cable basic parameter measurement on different types of faulty sample cables, the cable basic parameters include cable characteristic impedance Z cable (tp) and cable characteristic proportional coefficient K(tp). Divide faults into cable typical faults and cable typical process component faults, and establish a corresponding cable typical fault impedance feature library D according to fault types TFault (p,tp) and cable typical process component feature library D TComponent (q, tp); said p represents the cable electrical fault type, q represents the type of the typical process component of the cable, and tp represents the cable model.

[0041] b. The cable typical fault impedance characteristic library D TFault (p,tp) is differentially calc...

Embodiment 2

[0050] As the best embodiment of the present invention, the present invention includes a method for fault location of aircraft installed cables based on impedance characteristics, comprising the following steps:

[0051] a. Refer to the attached manual figure 2 , the module injects a voltage pulse signal into the cable under test, and the sampling unit collects and saves the voltage wave incident and reflected wave data. Ideally, the propagation speed of electromagnetic waves in the same type of wire is the same. Select known model tp and length L base The cable is used as a reference, and the proportional coefficient K (tp) is obtained by the following formula: For the same type of cable, multiple measurements are made to improve the accuracy. Test N kinds of length specifications to obtain N-1 cable characteristic proportional coefficients K(tp):

[0052]

[0053] Among them, the cable lengths are denoted as L base1 (tp),...,L basen (tp), the propagation time of the ...

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Abstract

The invention relates to the technical field of aircraft fault diagnosis, in particular to a fault location method for aircraft installed cables based on impedance characteristics, which measures the basic electrical parameters of the aircraft cables, and establishes a typical fault impedance feature library of this type of cable and a typical process component feature of the cable. library; through the differential comparison of the faulty cable parameters and the standard cable parameters under the same conditions, the fault characteristic waveform is extracted to form the fault criterion library D; by measuring the impedance waveform of the tested cable, it is compared with the fault criterion library D and the characteristics of typical process components , get the fault type, and calculate the cable fault or abnormal point position according to the reflection time. Through the method, the problems of difficult cable fault location and low troubleshooting work efficiency can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of aircraft fault diagnosis, in particular to a fault location method for aircraft installed cables based on impedance characteristics. Background technique [0002] As the medium of power transmission and signal transmission of airborne equipment, the aircraft power grid undertakes the transmission and distribution of all electrical signals on the aircraft. It is of great significance to the aircraft and is known as the "aircraft nervous system". It is related to the safety and reliability of the aircraft. Based on the current rapid development of science and technology in various fields, various types of aircraft in my country have been continuously upgraded, and the intelligence of each airborne system has been continuously improved, resulting in increasingly complex airborne optoelectronic networks, more diverse network topologies, a large number of nodes, and single point failures in the power grid. ris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088G01R31/083
Inventor 王丹阳唐健钧叶波张永建曹虎邓洪菊谢银
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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