CN103399256A - Method for realizing fault location of lead - Google Patents
Method for realizing fault location of lead Download PDFInfo
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- CN103399256A CN103399256A CN2013103041494A CN201310304149A CN103399256A CN 103399256 A CN103399256 A CN 103399256A CN 2013103041494 A CN2013103041494 A CN 2013103041494A CN 201310304149 A CN201310304149 A CN 201310304149A CN 103399256 A CN103399256 A CN 103399256A
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- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 6
- 238000005314 correlation function Methods 0.000 abstract description 7
- 230000008054 signal transmission Effects 0.000 abstract description 3
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Abstract
The invention relates to a method for realizing fault positioning of a lead. The method comprises extracting a first test signal from a wire to be tested; carrying out time delay processing on the first test signal to obtain a second test signal; inputting a third test signal and a second test signal reflected by the received first test signal at a fault position to be tested into a multiplier and outputting a fourth test signal according to the second test signal and the third test signal; performing integral operation on the fourth test signal to obtain a correlation function operation result of the second test signal and the third test signal; and carrying out peak value detection on the operation result of the correlation function so as to determine the fault position of the lead. The method has the advantages that specific test signals are not required to be designed, noise in the lead or the existing signals are used as the test signals, and the signal transmission of the lead to be tested can be completely unaffected, so that the data integrity of the airplane lead can be ensured, and the method is an ideal method for online detecting the multi-branch network fault of the lead.
Description
Technical field
The invention belongs to fault diagnosis field, particularly relate to a kind of method of utilizing noise territory reflectometry to realize the breakdown of conducting wires location.
Background technology
Aircraft wire is that the hardware unit of power source and transmission of control signals is provided for Aircraft Electrical System, is important energy source and the information channel that connects power supply, electromechanical equipment, electronic equipment and control system on aircraft.Along with the growth in age of aircraft machine, aircraft wire is worked for a long time in complex environment, the faults such as insulation course wearing and tearing, aging, corrosion very easily occur, finally causes the aircraft wire short circuit and opens circuit, for flight safety works the mischief.In existing aircraft wire fault detection method, the Time Domain Reflectometry detection method is a kind of general measuring technology.The principle of Time Domain Reflectometry method is low pressure high frequency pulsed reference signal of an end emission of guiding line, because breakdown of conducting wires can cause its impedance, changes, and reference signal can reflect at the fault place.At signal incident end, reflected signal detected, utilize to calculate the breakdown of conducting wires position time delay of incoming signal and reflected signal, the type that the amplitude of reflected signal and direction can failure judgement.Frequency domain inverse shooting method measuring principle is that swept-frequency signal is input to wire to be measured, and the measurement data of its reflected signal is converted to time-domain information through inverse fast Fourier transform, according to the relative velocity of propagation of wire, with the difference of the dielectric material of cable, just change and can calculate abort situation.These method measurement results are comparatively accurate, but need the specific test signal of special emission, test signal likely causes interference to the useful signal of aircraft wire transmission, the more important thing is due to aircraft working environment complexity, in reflected signal, likely sneak into noise signal, cause the aircraft wire Weak fault to be difficult to diagnosis, and be not suitable for on-line testing.Spread spectrum technique is very outstanding to the on-line testing effect, its principle is to cable under test emission scale-of-two pseudo-random code or through the PN of sine wave modulation coded signal, the reflected signal that detects and the incoming signal of delay are carried out to related operation, correlator output reaches maximum, thereby determine the time delay of signal, with this, calculate the breakdown of conducting wires position.This method may be used in the aircraft on-line testing, the test that namely also can continue wire in aircraft flight.Although spread spectrum approach can be carried out on-line monitoring to aircraft wire, but still need emission PN code as test signal, affect the transmission of aircraft wire data, and the wire of multiple-limb network structure is difficult to detect.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of method of utilizing noise territory reflectometry to realize aircraft wire multiple-limb network failure location, utilize the arbitrary signal of any noise signal in wire or transmission as test signal, calculate the related function of test signal and inhibit signal, obtain the corresponding moment of peak point, judgement aircraft wire multiple-limb network failure position.
In order to achieve the above object, the method that realizes the breakdown of conducting wires location that a first aspect of the present invention provides comprises the following steps:
-from wire to be measured, extracting the first test signal;
-described the first test signal is carried out to time delay processing, thus the second test signal obtained;
The 3rd test signal that-described first test signal that will receive reflects at abort situation place to be measured and described the second test signal input multiplier and by described multiplier according to described the second test signal and described the 3rd test signal output the 4th test signal;
-described the 4th test signal is carried out to integral operation, to obtain the related function operation result of described the second test signal and described the 3rd test signal;
-described related function operation result is carried out to the peak value detection, to determine the abort situation of described wire.
In foundation one embodiment of the present of invention, described the first test signal is the arbitrary signal that transmits in noise signal or described wire.
In foundation one embodiment of the present of invention, described wire is aircraft wire.
In addition, a second aspect of the present invention has also proposed a kind of device of realizing the breakdown of conducting wires location, and described device comprises:
-extraction element, it is from extracting the first test signal wire to be measured;
The-the first treating apparatus, it carries out time delay processing by described the first test signal, thereby obtains the second test signal;
-receiving trap, it receives the 3rd test signal that described the first test signal reflects at abort situation place to be measured;
The-the second treating apparatus, it is usingd described the second test signal and described the 3rd test signal as input and it is carried out to multiplying and integral operation, to obtain the related function operation result of described the second test signal and described the 3rd test signal;
-determine device, it carries out the peak value detection to described related function operation result, to determine the abort situation of described wire.
In foundation one embodiment of the present of invention, described wire to be measured is aircraft wire.
In foundation one embodiment of the present of invention, described extraction element is data collecting card.
In foundation one embodiment of the present of invention, described the second treating apparatus is multiplier.
In foundation one embodiment of the present of invention, described the first test signal is the arbitrary signal that transmits in noise signal or described wire.
noise provided by the invention territory reflectometry is a kind of method of online detection aircraft wire multiple-limb network failure, utilize the arbitrary signal of any noise signal in wire or transmission as test signal, test signal is carried out to the regular hour delay, and together with the inhibit signal of the signal that aircraft wire abort situation place is reflected back and test signal, send into multiplier and carry out computing, integral operation is carried out in output to multiplier, obtain the related function operation result of test signal and inhibit signal, by pair correlation function, export data analysis, get the corresponding moment of peak point, judgement aircraft wire multiple-limb network failure position.The advantage of noise territory reflectometry is to design specific test signal, and, using the noise in wire or existing signal as test signal, can not affect the signal transmission of wire to be measured fully.Therefore, noise territory reflectometry is the Perfected process that guarantees the aircraft wire data integrity, detects online wire multiple-limb network failure.
The accompanying drawing explanation
By the reference accompanying drawing, read following detailed description to non-limiting example, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is that the noise territory reflectometry that utilizes provided by the invention is realized the online method flow diagram that detects aircraft wire multiple-limb network failure;
Fig. 2 is that the method for utilizing noise territory reflectometry to realize online detection aircraft wire multiple-limb network failure provided by the invention is specifically implemented block diagram.
Embodiment
Fig. 1 is that the noise territory reflectometry that utilizes provided by the invention is realized the online method flow diagram that detects aircraft wire multiple-limb network failure.As shown in Figure 1, at first extract the signal that transmits in noise in aircraft wire to be measured or wire as noise domain test signal, test signal is carried out to the regular hour delay, and together with the inhibit signal of the signal that aircraft wire abort situation place is reflected back and test signal, send into multiplier and carry out computing, integral operation is carried out in output to multiplier, obtain the related function operation result of test signal and inhibit signal, by pair correlation function, export data analysis, get the corresponding moment of peak point, judgement aircraft wire multiple-limb network failure position.
If have fault in the network of conductors structure, the characteristic impedance of breakdown of conducting wires place there will be variation, and therefore, place can produce reflected signal at the network of conductors structure failure, and reflected signal can superpose somewhere with incoming signal.The dependence that can reflect incoming signal and reflected signal due to related function, therefore in the abort situation of aircraft wire multiple-limb network structure, utilize the calculating of related function can determine that there is kurtosis in abort situation, determine that kurtosis is constantly corresponding, utilize the velocity of propagation of signal in wire to multiply by peak hour, can calculate the abort situation in network of conductors.If the abort situation that detects is different from the known network conductor structure, can determine that there is fault in the network of conductors somewhere.
Put it briefly, the method that realizes that breakdown of conducting wires is located provided by the present invention comprises the following steps:
-from wire to be measured, extracting the first test signal;
-the first test signal is carried out to time delay processing, thus the second test signal obtained;
The 3rd test signal that-first test signal that will receive reflects at abort situation place to be measured and the second test signal input multiplier and by multiplier according to the second test signal and the 3rd test signal output the 4th test signal;
-the 4th test signal is carried out to integral operation, to obtain the related function operation result of the second test signal and the 3rd test signal;
-pair correlation function operation result carries out the peak value detection, to determine the abort situation of wire.
In foundation one embodiment of the present of invention, the first test signal is the arbitrary signal that transmits in noise signal or wire.
More specifically, method proposed by the invention mainly is applicable to the abort situation detection that wire is the aircraft wire multiple-limb network of aircraft wire.
Fig. 2 is that the method for utilizing noise territory reflectometry to realize online detection aircraft wire multiple-limb network failure provided by the invention is specifically implemented block diagram.As shown in Figure 2, build noise territory reflection experiment porch, utilize data collecting card to obtain the noise territory reflected signal at aircraft wire fault place, the inhibit signal of this reflected signal and test signal is carried out to the related function computing, the output of correlator is sent into to computing machine and is depicted as delay function by an analog to digital converter sampling, record the correlation peak of each time delay, find out maximum related value constantly, utilize the localization of fault computing module, the time value product corresponding with maximum related value by velocity of propagation calculates trouble spot.Next will introduce the device of realizing the breakdown of conducting wires location according to of the present invention, this device comprises:
-extraction element, it is from extracting the first test signal wire to be measured;
The-the first treating apparatus, it carries out time delay processing by the first test signal, thereby obtains the second test signal;
-receiving trap, it receives the 3rd test signal that the first test signal reflects at abort situation place to be measured;
The-the second treating apparatus, it is usingd the second test signal and the 3rd test signal as input and it is carried out to multiplying and integral operation, to obtain the related function operation result of the second test signal and the 3rd test signal;
-determine device, its pair correlation function operation result carries out the peak value detection, to determine the abort situation of wire.
More specifically, wire to be measured is aircraft wire.
Preferably, extraction element is data collecting card.
Alternatively or additionally, the second treating apparatus is multiplier.
Particularly preferably, the first test signal is the arbitrary signal that transmits in noise signal or wire.
noise provided by the invention territory reflectometry is a kind of method of online detection aircraft wire multiple-limb network failure, utilize the arbitrary signal of any noise signal in wire or transmission as test signal, test signal is carried out to the regular hour delay, and together with the inhibit signal of the signal that aircraft wire abort situation place is reflected back and test signal, send into multiplier and carry out computing, integral operation is carried out in output to multiplier, obtain the related function operation result of test signal and inhibit signal, by pair correlation function, export data analysis, get the corresponding moment of peak point, judgement aircraft wire multiple-limb network failure position.The advantage of noise territory reflectometry is to design specific test signal, and, using the noise in wire or existing signal as test signal, can not affect the signal transmission of wire to be measured fully.Therefore, noise territory reflectometry is the Perfected process that guarantees the aircraft wire data integrity, detects online wire multiple-limb network failure.
Those skilled in the art will be understood that above-described embodiment is all exemplary and nonrestrictive.The different technologies feature that occurs in different embodiment can make up, to obtain beneficial effect.Those skilled in the art, on the basis of research accompanying drawing, instructions and claims, will be understood that and realize the embodiment of other variations of the embodiment that discloses.In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of a plurality of; Term " first ", " second " are be used to indicating title but not be used to representing any specific order.Any Reference numeral in claim all should not be understood to the restriction to protection domain.Some technical characterictic appears in different dependent claims and does not mean that and can not make up these technical characterictics to obtain beneficial effect.This patent covers literal all methods, device and the product of going up or falling into the scope of claims in doctrine of equivalents.
Claims (8)
1. method (100) that realizes breakdown of conducting wires location said method comprising the steps of:
-from wire to be measured, extracting the first test signal (S10);
-described the first test signal is carried out to time delay processing, thus the second test signal (S20) obtained;
The 3rd test signal that-described first test signal that will receive reflects at abort situation place to be measured and described the second test signal input multiplier and by described multiplier according to described the second test signal and described the 3rd test signal output the 4th test signal (S30);
-described the 4th test signal is carried out to integral operation, to obtain the related function operation result (S40) of described the second test signal and described the 3rd test signal;
-described related function operation result is carried out to the peak value detection, to determine the abort situation (S50) of described wire.
2. method according to claim 1, wherein, described the first test signal is the arbitrary signal that transmits in noise signal or described wire.
3. method according to claim 1, wherein, described wire is aircraft wire.
4. device (200) of realizing breakdown of conducting wires location, described device comprises:
-extraction element (210), it is from extracting the first test signal wire to be measured;
The-the first treating apparatus (220), it carries out time delay processing by described the first test signal, thereby obtains the second test signal;
-receiving trap, it receives the 3rd test signal that described the first test signal reflects at abort situation place to be measured;
The-the second treating apparatus (230), it is usingd described the second test signal and described the 3rd test signal as input and it is carried out to multiplying and integral operation, to obtain the related function operation result of described the second test signal and described the 3rd test signal;
-determine device (250), it carries out the peak value detection to described related function operation result, to determine the abort situation of described wire.
5. device according to claim 4, is characterized in that, described wire to be measured is aircraft wire.
6. device according to claim 4, is characterized in that, described extraction element (210) is data collecting card.
7. device according to claim 4, is characterized in that, described the second treating apparatus is multiplier.
8. device according to claim 4, is characterized in that, described the first test signal is the arbitrary signal that transmits in noise signal or described wire.
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| CN111693861A (en) * | 2020-06-24 | 2020-09-22 | 中电科仪器仪表有限公司 | Switch matrix channel fault diagnosis method and system |
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