CN205941736U - Trouble arc detection device - Google Patents
Trouble arc detection device Download PDFInfo
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- CN205941736U CN205941736U CN201620854247.4U CN201620854247U CN205941736U CN 205941736 U CN205941736 U CN 205941736U CN 201620854247 U CN201620854247 U CN 201620854247U CN 205941736 U CN205941736 U CN 205941736U
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Abstract
The utility model discloses a trouble arc detection device relates to electrical safety fire fighting field. Device wherein includes filtering shaping circuit and detection and analysis circuit, and the output and the input of detection and analysis circuit of filtering shaping circuit are connected, wherein, the highs signal of filtering shaping circuit extraction electric loop intermediate -current to with highs signal transmission to detection and analysis circuit, the scale parameter of the highs signal of detection and analysis circuit extraction electric current is more than or equal to at scale parameter under the condition of yardstick threshold value, confirms to contain in the electric loop fault electric arc. The device realizes simply, can the be real -time accurate fault electric arc that recognises electric loop and each branch road the inside.
Description
Technical field
The utility model is related to electrical safety fire-fighting domain, more particularly, to a kind of fault arc detection device.
Background technology
Electric arc is a kind of electric discharge phenomena crossing over certain medium such as air between two electrodes, the electricity that electric arc is consumed
The energy mode such as light, sound, heat energy, electromagnetic radiation can be converted into, arc center's temperature is at least in 1000 DEG C, extreme case simultaneously
Even more than 15000 DEG C down.General arc discharge refers in particular to puncture between two electrodes having voltage difference to be put produced by air
Electrical phenomena.
In the middle of existing electric loop, have so-called normal arc and fault electric arc point, wherein normal arc is divided again
For single electric arc and cycle electric arc.Single electric arc is mainly contactor action and is produced, and is characterized in that time of origin is random, no
Continuously, produce typically only in one or several alternating current half-waves, the gross energy of single electric arc particularly generates total amount of heat ratio
Less and be controlled will not to cause disastrous consequence, to this single electric arc it should to process not as harmful electric arc.
Cycle electric arc refers to some electrical equipments carrying out work by arc discharge, such as arc welding, electric arc furnaces, arc discharge lamp etc. or
Work in the electrical equipment under high speed periodic switch state, such as the internal electric hand drill carrying brush motor, impact drill, electric hammer
On electric arc produced by electrical equipment, this kind of electric arc is also in controllable state, will not cause disastrous consequence.For this electric arc
Also should not be taken as harmful electric arc to process, or otherwise these electrical equipments can not normal work by mistakenly protectiveness power-off
Make, or unprotected after fault electric arc will being created in the middle of electric loop.
Harmful electric arc typically results from that insulating barrier in the middle of electric loop is aging, external impacts or mouse gnaw etc., and insulating barrier breaks
Damage, electrical connection loosen, electrical fitting corrosion, electric parts damage, external conduction debris enter.Produced by these faults
To have very strong randomness and harmfulness in electric arc, the light and heat carbonization insulating barrier that electric arc produces there is, and melts even gasification conductive
Metal, more aggravates the generation of short circuit accident.In the middle of unprotected electric circumstance, the fire incident that fault electric arc is caused accounts for
More than the 40% of electrical fire, especially in some inflammable and explosive occasions, the catastrophic failure of initiation is more terrified.Therefore in electricity
Fault electric arc detection is installed in the middle of gas equipment be highly desirable to protection device.
The adopted method of most fault electric arc detections includes at present：Harmonic component method, Wavelet Transform, temporal signatures
Method, high-frequency characteristic method, FFT+ neural network etc., these methods have very high process energy for most fault electric arc
Power, but there are the electrical equipment of cycle electric arc generation, such as arc welding, electric arc furnaces, electric arc in the middle of shielded electric loop
High frequency electric is had to fluctuate in the middle of discharge lamp etc. and the internal electric hand drill carrying brush motor, impact drill, electric hammer etc. or electric loop
Electrical appliance, such as Household induction cooker etc., fault electric arc will be produced and report to the police and protectiveness power-off, and normal guarantor can not be played
Shield acts on.
Utility model content
A technical problem to be solved in the utility model is to provide a kind of side that can effectively improve arc fault detection
Case.
According to the utility model on the one hand, a kind of fault arc detection device is proposed, including filtering shaping circuit and detection
Analysis circuit, the output end of filtering shaping circuit is connected with the input of detection and analysis circuit；Wherein, filtering shaping circuit extracts
The high frequency signal of electric current in electric loop, and high frequency signal is sent to detection and analysis circuit；Detection and analysis circuit
Extract the scale parameter of the high frequency signal of electric current, in the case that scale parameter is more than or equal to yardstick threshold value, determine electricity
Fault electric arc is comprised in air circuit.
Further, scale parameter includes positional information scale parameter and the energy information chi of the high frequency signal of electric current
Degree parameter.
Further, this device also includes current collection circuit；Wherein, the output end of current collection circuit and filter shape
The input of circuit connects, and current collection circuit gathers the current signal in electric loop.
Further, current collection circuit is twin coil current transformer or current divider.
Further, filtering shaping circuit includes high-pass filtering circuit and rejector circuit；Wherein, high-pass filtering circuit
Input be connected with the output end of current collection circuit；The output end of high-pass filtering circuit and the input of rejector circuit
Connect.
Further, filtering shaping circuit also includes low-pass filter circuit；The input of low-pass filter circuit and electric current are adopted
The output end of collector connects；The output end of low-pass filter circuit is connected with the input of rejector circuit.
Further, filtering shaping circuit also includes amplifying circuit；Wherein, the input of amplifying circuit and bandreject filtering electricity
The output end on road connects.
Further, this device also includes warning circuit；Wherein, the input of warning circuit with detection and analysis circuit defeated
Go out end to connect, in the case that warning circuit meets preassigned fault electric arc in the fault electric arc in electric loop, carry out fault
Report to the police.
Further, this device also includes control circuit；Wherein, the input of control circuit with detection and analysis circuit defeated
Go out end to connect, in the case that control circuit meets preassigned fault electric arc in the fault electric arc in electric loop, send and thread off
Power-off signal.
Further, this device also includes telecommunication circuit；Wherein, the input of telecommunication circuit with detection and analysis circuit defeated
Go out end to connect, telecommunication circuit is communicated with the external world by WIFI.
Compared with prior art, the utility model includes filtering shaping circuit and detection and analysis circuit, filtering shaping circuit
Output end with detection and analysis circuit input be connected；Wherein, filtering shaping circuit extracts the high frequency of electric current in electric loop
Component signal, and high frequency signal is sent to detection and analysis circuit；The high fdrequency component letter of detection and analysis circuit extracts current
Number scale parameter, scale parameter be more than or equal to yardstick threshold value in the case of, determine and in electric loop, comprise fault electric arc.
This device is realized simply, accurately identifying the fault electric arc inside electric loop and each branch road in real time.
By the detailed description to exemplary embodiment of the present utility model referring to the drawings, other of the present utility model
Feature and its advantage will be made apparent from.
Brief description
Constitute the Description of Drawings of a part the embodiment of the present utility model of specification, and use together with the description
In explanation principle of the present utility model.
Referring to the drawings, according to detailed description below, the utility model can be more clearly understood from, wherein：
Fig. 1 is the structural representation of an embodiment of the utility model fault arc detection device.
Fig. 2A is the schematic diagram of high-pass filtering circuit.
Fig. 2 B is the schematic diagram of low-pass filter circuit.
Fig. 2 C is the schematic diagram of rejector circuit.
Fig. 3 is the structural representation of another embodiment of the utility model fault arc detection device.
The twin coil current transformer that Fig. 4 applies for the utility model and sample circuit schematic diagram.
Fig. 5 A is Gaussian Profile figure.
Fig. 5 B is standard gaussian distribution map.
Specific embodiment
To describe various exemplary embodiment of the present utility model now with reference to accompanying drawing in detail.It should be noted that：Unless it is another
Illustrate outward, the positioned opposite, numerical expression of the part otherwise illustrating in these embodiments and step and numerical value do not limit
Make scope of the present utility model.
Simultaneously it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality
Proportionate relationship draw.
Description only actually at least one exemplary embodiment is illustrative below, never as to this practicality
Any restriction that is new and its applying or use.
May be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
When in the case of, described technology, method and apparatus should be considered authorize specification a part.
In all examples with discussion shown here, any occurrence should be construed as merely exemplary, and not
It is as restriction.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it is further discussed in subsequent accompanying drawing.
For making the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with specific embodiment, and
Referring to the drawings, the utility model is further described.
Fig. 1 is the structural representation of an embodiment of the utility model fault arc detection device.This device includes filtering
Wave shaping circuit 110 and detection and analysis circuit 120, filtering shaping circuit 110 and detection and analysis circuit 120 connect, wherein：
Filtering shaping circuit 110 extracts the high frequency signal of electric current in electric loop.Wherein, filtering shaping circuit 110
High-pass filtering circuit as shown in Figure 2 A, low-pass filter circuit as shown in Figure 2 B and band resistance filter as that shown in fig. 2 c can be included
Wave circuit.Two-way will be divided into by current signal in electric loop, a road current signal enters low-pass filter circuit, a road electric current
Signal enters high-pass filtering circuit, and the current signal of low-pass filter circuit and high-pass filtering circuit output all enters bandreject filtering electricity
Road, the current signal of rejector circuit's output exports waveform to be detected, in this waveform to be detected after gain amplifying circuit
Comprise the high-frequency component information of electric current.
Detection and analysis circuit 120 extracts the scale parameter of the high frequency signal of electric current, is more than yardstick threshold in scale parameter
In the case of value, determine and in electric loop, comprise fault electric arc.This detection and analysis circuit 120 can be PLC, integrated circuit, phase
Close the specific hardware unit of the compositions such as part.Wherein scale parameter can include positional information scale parameter or energy information chi
Degree parameter, in one embodiment, scale parameter is the standard deviation sigma of high frequency signal.As σ ＞ σSet, then may determine that at this
Harmful electric arc is created in the middle of electric loop in sampling period.
In this embodiment, the scale parameter of electric current is obtained by the high frequency signal of electric current in electric loop, in chi
In the case that degree parameter is more than yardstick threshold value, determines and in electric loop, comprise fault electric arc.The utility model can be accurate in real time
Identify the fault electric arc inside electric loop and each branch road.
Fig. 3 is the structural representation of another embodiment of the utility model fault arc detection device.This device includes
Current collection circuit 310, filtering shaping circuit 320 and detection and analysis circuit 330, filtering shaping circuit 320 is adopted with electric current respectively
Collector 310 and detection and analysis circuit 330 connect, wherein：
Current collection circuit 310 gathers the current signal in electric loop.This current collection circuit 310 can be twin coil
Current transformer or current divider, that is, pass through twin coil current transformer or current divider obtains the current signal in electric loop.
Filtering shaping circuit 320 extracts the high fdrequency component of current signal, and exports the current waveform of different high fdrequency components.Should
Filtering shaping circuit 320 can include high-pass filtering circuit 321, low-pass filter circuit 322, rejector circuit 323 and amplify
Circuit 324, high-pass filtering circuit 321, low-pass filter circuit 322, rejector circuit 323 can be respectively as Fig. 2A, 2B, 2C institute
Show.Wherein, the input of high-pass filtering electricity 321 and low-pass filter circuit 322 is connected with the output end of current collection circuit 310 respectively
Connect, high-pass filtering circuit 321 and low-pass filter circuit 322 output end are connected with the input of rejector circuit 323 respectively, band
The output end of resistance filter circuit 323 is connected with the input of amplifying circuit 324.In one embodiment, also include simulation numeral
Converter 325, that is, electric current is through carrying out sampling calculating by analog-digital converter 325.In one embodiment, current acquisition
Circuit 310 and filtering shaping circuit 320 can be for shown in Fig. 4.
Detection and analysis circuit 330 calculates the yardstick ginseng of the high frequency signal of the electric current after sampling according to Gauss distribution method
Number, in the case that scale parameter is more than yardstick threshold value, determines and comprises fault electric arc in electric loop.Wherein test and analyze circuit
The 330 specific hardware units that can pass through the composition such as PLC, integrated circuit, associated components are realized.
Wherein, Gaussian Profile (Gaussian distribution) also known as normal distribution (Normaldistribution),
Be one in all very important probability distribution in the fields such as mathematics, physics and engineering, have great in terms of statistical many
Influence power.As shown in Figure 5A, if stochastic variable X obey location parameter be μ, scale parameter be the probability distribution of σ, and its
Probability density function isThen this stochastic variable is known as normal random variable, normal state
The distribution that stochastic variable is obeyed is known as normal distribution, is denoted as X～N (μ, σ ^2), pronounces obedience, or Normal Distribution.As figure
Shown in 5B, when μ=0, σ=1, the probability density function curve that normal distribution just becomes standardized normal distribution normal distribution is in clock
Shape, therefore people are often referred to as bell curve again.The definition of Gauss distribution method is no longer further described herein.
Because fault electric arc is puncturing before air forms stable electric arc (defining periodicity electric arc) completely, electric arc produces
Mechanism has several factors, under the collective effect of these factors, allows for time of produced electric arc, position, size
It is substantially all, etc. parameter, the characteristic meeting Gaussian Profile, and do not having electric arc to occur or then do not meeting this when producing normal arc
Rule, such as single electric arc only produce once, just no longer produce；Periodicity electric arc is then regular generation.So only needing to
The size of the scale parameter σ of the positional information of detection electric loop electric current high-frequency fluctuation or energy information can determine whether harmful electricity
Arc, the σ ＞ σ being calculated when the sampled point in certain sampling timeSetWhen, then can be determined that within this sampling period electrically
Fault electric arc is created in loop.
In this embodiment, gather ultra-low-distortion earth-current waveform using twin coil transformer；And utilize hardware filtering
Shaping circuit, to amplify the high-frequency characteristic of fault electric arc, greatly reduces the fault electric arc wrong report in the case of detection different loads
Probability.On the other hand, the fault electric arc determining in electric loop is calculated by Gauss distribution method, algorithm is simple, and then drop
Low cost.Additionally, the detection method sensitivity that the utility model is proposed is very high, can accurately identify electric loop in real time
The inside and each branch road inside fault electric arc, strong antijamming capability.
In another embodiment of the present utility model, filtering shaping circuit 320 also extracts the low of electric current in electric loop
Frequency component signal.Wherein, high fdrequency component is used for analyzing whether comprise fault electric arc in electric loop, and low frequency component is used for measuring electricity
The size of electric current in air circuit, whether the energy that this size of current is used for defining fault electric arc meets UL1699 or equivalent standard
Set quota.
Detection and analysis circuit 330 also judges whether the energy of the low frequency component signal of electric current is more than energy threshold, if low frequency
The energy of component signal is more than energy threshold it is determined that the fault electric arc in electric loop is standard failure electric arc.Electrically return
Fault electric arc in road meets UL1699 or equivalent standard set quota.
If the fault electric arc in electric loop is standard failure electric arc, this fault arc detection device can also include reporting to the police
Circuit 340 and control circuit 350, warning circuit 340 and control circuit 350 can pass through PLC, integrated circuit, associated components etc.
The specific hardware unit of composition is realized, wherein：
Warning circuit 340 is connected with detection and analysis circuit 330, and the fault electric arc in electric loop meets preassigned event
In the case of barrier electric arc, carry out fault alarm, for example, fault electric arc meets UL1699 or other equivalent standard set quotas then
Carry out fault alarm.
Control circuit 350 is connected with detection and analysis circuit 330, and the fault electric arc in electric loop meets preassigned event
In the case of barrier electric arc, send dropout power-off signal, for example, fault electric arc meets the finger that UL1699 or other equivalent standard specify
Mark then sends dropout power-off signal.
In one embodiment, this fault arc detection device can also include telecommunication circuit 360, and telecommunication circuit 360 is led to
Cross wireless mode to be communicated with the external world.For example communicated with the external world by WIFI.Telecommunication circuit 360 can pass through PLC, collection
The specific hardware unit becoming the compositions such as circuit, associated components is realized.
In the above-described embodiments, the scale parameter of electric current high fdrequency component in electric loop is calculated by Gauss distribution method,
When scale parameter is more than threshold value, judge to comprise fault electric arc in electric loop, when the energy of the low frequency component signal of electric current is big
When energy threshold, determine that the fault electric arc in electric loop is standard failure electric arc.If there being continuously N number of electricity in several cycles
In the case that arc number reaches UL1699 or the requirement of other equivalent standard, then send audible alarm and disconnect trip signal.This event
Barrier arc method for measuring sensitivity very high, can accurately identify in real time inside electric loop and each branch road inside fault
Electric arc, and antijamming capability is very strong.
One embodiment of the scale parameter of its high frequency signal with specific reference to Gauss distribution method calculating current can
With as follows.
Half-wave sampling is carried out to the high frequency signal of electric current.Taking the electric loop of 50Hz alternating current as a example, the sampling time
It is defined as the hemiwave time of 50Hz AC signal, that is, using 10ms as a sampling period, sampling rate adopts 500Ksps, that
As an entirety, the value of these collection points represents the size of current of corresponding time to the AD collection value of each 5000 point, if
It is set to ItFor I0～4999.Sampling time is defined as the hemiwave time of 50Hz AC signal, therefore can reduce the number of sampled point.
Calculated subsequently through high-speed CPU.For example, glossmeter is carried out to the size of the high frequency signal of the electric current in the sampling period
Calculate.I in conjunction with upper a cycleOn tCurrent value, enters the moving average that line width has selected 16 points for A such as representative value
A16 (0～4999), smooth these measured values.Size I by current value in the sampling period0～4999With current value in the smooth post-sampling cycle
Size A16 (0～4999)Difference carry out absolute value calculating after obtain Pi, then to PiCarry out mean value calculation and obtain P.Calculate institute
There is I0～4999With A16 (0～4999)Between difference absolute value Pi=ABS (Ii–A16i), calculate P=1/5000 × Σ P simultaneouslyi.To own
PiP with a upper cycleOnRelatively, in order to reduce amount of calculation, only calculate T=(Pi-nPOn), wherein n is the ginseng being previously set
Number.Calculate σ=(Σ Ti×Ti)0.5, σ last and set in advanceSetCompare, wherein σ is that the energy of fault electric arc is big
Little.As σ ＞ σSetWhen, then can be determined that in electric loop within this sampling period and create fault electric arc.
In this embodiment, meet Gaussian Profile because time of fault electric arc, position, size etc. parameter is substantially all
Characteristic, therefore only need to detect that the scale parameter σ's of the positional information of electric loop electric current high-frequency fluctuation or energy information is big
Little can determine whether harmful electric arc, this detection method sensitivity is very high, can accurately identify inside electric loop and each in real time
Fault electric arc inside individual branch road, and antijamming capability is very strong.
So far, the utility model is described in detail.In order to avoid covering design of the present utility model, this is not described
Some details well known to field.Those skilled in the art as described above, completely it can be appreciated how implementing public here
The technical scheme opened.
Although being described in detail to some specific embodiments of the present utility model by example, this area
It is to be understood by the skilled artisans that above example is merely to illustrate, rather than in order to limit scope of the present utility model.This
Field it is to be understood by the skilled artisans that can be in the case of without departing from scope and spirit of the present utility model, to above example
Modify.Scope of the present utility model is defined by the following claims.
Claims (10)
1. a kind of fault arc detection device is it is characterised in that include filtering shaping circuit and detection and analysis circuit, described filtering
The output end of shaping circuit is connected with the input of described detection and analysis circuit；
Wherein, described filtering shaping circuit extracts the high frequency signal of electric current in electric loop, and described high fdrequency component is believed
Number send to described detection and analysis circuit；The yardstick ginseng of the high frequency signal of electric current described in described detection and analysis circuit extraction
Number, in the case that described scale parameter is more than or equal to yardstick threshold value, determines in described electric loop and comprises fault electric arc.
2. device according to claim 1 is it is characterised in that described scale parameter includes the high fdrequency component letter of described electric current
Number positional information scale parameter and energy information scale parameter.
3. device according to claim 1 is it is characterised in that also include current collection circuit；
Wherein, the output end of described current collection circuit is connected with the input of described filtering shaping circuit, described current acquisition
Circuit gathers the current signal in described electric loop.
4. device according to claim 3 it is characterised in that described current collection circuit be twin coil current transformer or
Current divider.
5. device according to claim 3 is it is characterised in that described filtering shaping circuit includes high-pass filtering circuit and band
Resistance filter circuit；
Wherein, the input of described high-pass filtering circuit is connected with the output end of described current collection circuit；Described high-pass filtering
The output end of circuit is connected with the input of described rejector circuit.
6. device according to claim 5 is it is characterised in that described filtering shaping circuit also includes low-pass filter circuit；
Wherein, the input of described low-pass filter circuit is connected with the output end of described current collection circuit；Described LPF
The output end of circuit is connected with the input of described rejector circuit.
7. device according to claim 6 is it is characterised in that described filtering shaping circuit also includes amplifying circuit；
Wherein, the input of described amplifying circuit is connected with the output end of described rejector circuit.
8. according to the arbitrary described device of claim 1-7 it is characterised in that also including warning circuit；
Wherein, the input of described warning circuit is connected with the output end of described detection and analysis circuit, and described warning circuit is in institute
State in the case that the fault electric arc in electric loop meets preassigned fault electric arc, carry out fault alarm.
9. according to the arbitrary described device of claim 1-7 it is characterised in that also including control circuit；
Wherein, the input of described control circuit is connected with the output end of described detection and analysis circuit, and described control circuit is in institute
State in the case that the fault electric arc in electric loop meets preassigned fault electric arc, send dropout power-off signal.
10. according to the arbitrary described device of claim 1-7 it is characterised in that also including telecommunication circuit；
Wherein, the input of described telecommunication circuit is connected with the output end of described detection and analysis circuit, and described telecommunication circuit is passed through
Wireless mode is communicated with the external world.
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| CN201620854247.4U CN205941736U (en) | 2016-08-09 | 2016-08-09 | Trouble arc detection device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085158A (en) * | 2017-06-20 | 2017-08-22 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device and method for gathering communication |
| CN107703377A (en) * | 2016-08-09 | 2018-02-16 | 北京维森科技有限公司 | Fault arc detection method and device |
| CN108461994A (en) * | 2017-02-21 | 2018-08-28 | 北京维森科技有限公司 | Wall jack and its control method |
| CN108461361A (en) * | 2017-02-21 | 2018-08-28 | 北京维森科技有限公司 | Air switch and air switch control method |
| CN110068720A (en) * | 2018-01-22 | 2019-07-30 | 北京维森科技有限公司 | High-frequency current detection device, method and fault electric arc detection system |
| CN111898508A (en) * | 2020-07-22 | 2020-11-06 | 桂林电子科技大学 | Method for detecting defects of electric impact batch parts based on auditory perception |
| CN112154334A (en) * | 2018-05-22 | 2020-12-29 | 施耐德电气美国股份有限公司 | Improved arc fault detection using frequency hopping techniques |
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2016
- 2016-08-09 CN CN201620854247.4U patent/CN205941736U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107703377A (en) * | 2016-08-09 | 2018-02-16 | 北京维森科技有限公司 | Fault arc detection method and device |
| CN108461994A (en) * | 2017-02-21 | 2018-08-28 | 北京维森科技有限公司 | Wall jack and its control method |
| CN108461361A (en) * | 2017-02-21 | 2018-08-28 | 北京维森科技有限公司 | Air switch and air switch control method |
| CN107085158A (en) * | 2017-06-20 | 2017-08-22 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device and method for gathering communication |
| CN110068720A (en) * | 2018-01-22 | 2019-07-30 | 北京维森科技有限公司 | High-frequency current detection device, method and fault electric arc detection system |
| CN112154334A (en) * | 2018-05-22 | 2020-12-29 | 施耐德电气美国股份有限公司 | Improved arc fault detection using frequency hopping techniques |
| CN111898508A (en) * | 2020-07-22 | 2020-11-06 | 桂林电子科技大学 | Method for detecting defects of electric impact batch parts based on auditory perception |
| CN111898508B (en) * | 2020-07-22 | 2022-06-10 | 桂林电子科技大学 | Method for detecting defects of electric impact batch parts based on auditory perception |
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