CN108459050A - A kind of method and device judging equipment operation condition according to electrical parameter - Google Patents
A kind of method and device judging equipment operation condition according to electrical parameter Download PDFInfo
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- G—PHYSICS
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Abstract
The present invention provides a kind of method and device judging equipment operation condition according to electrical parameter, and method includes the following steps：Step 100：Obtain the electric signal of equipment；Step 200：The electrical parameter character representation of equipment is obtained using the electric signal of equipment；Step 300：Electrical parameter feature is analyzed, and judges whether exception.The present invention creatively judges the working condition of equipment by the electrical parameter of industrial equipment, judge whether equipment breaks down according to the relationship between each real-time electrical parameter and electric value and error compensation value, or judge the degree of its abrasion, and it can realize the functions such as maintenance prompt, for vibration detection in compared with the existing technology, technology realization is more simple, and cost is more cheap, and operability is more preferable.
Description
Technical field
The present invention relates to a kind of method and devices judging equipment operation condition, and in particular to a kind of to be sentenced according to electrical parameter
The method and device of disconnected equipment operation condition, belongs to industrial equipment Internet surveillance field.
Background technology
Equipment detection generally refers to be detected equipment indices using all kinds of detecting instruments, and safety is ensured to reach
The purpose used.Testing techniques of equipment includes monitoring technology and diagnostic techniques two parts.Monitoring technology is to utilize detection instrument pair
Whole equipment or key position carry out regularly or continuous monitoring, with obtain can illustrate status of equipment image (curve) or
Magnitude.And control signal or alarm are sent out before the failure occurs.There are many type of monitoring technology, such as pollution, corrosion and power
Monitoring, temperature signal sensing, the monitoring of wear particle, the monitoring of sound, telemetry etc..Diagnosis of technique is carried in monitoring instrument
On the basis of information.The technology status of certain parts or whole equipment is judged, finds out defect.Good equipment inspection
Survey technology can comprehensively, accurately grasp abrasion, aging, deterioration, the position of corrosion and the degree of equipment and other are related
Situation.Early prediction and tracking are carried out on this basis, the planned maintenance system of equipment can be changed into both economical, rational
Preventive maintenance system.In this way, on the one hand can under conditions of avoiding equipment breakdown, reduce due to not grasping equipment attrition situation and
Blindly dismantle the damage brought to machine；On the other hand caused economic loss out of service can be reduced.
Existing testing techniques of equipment relies on substantially the detection of mechanical parameter, for example, shaft, bearing, gear are compositions
Three big components of transmission chain detect the vibrational state of each transmission parts, or detection displacement situation using vibratory drilling method to judge to pass
Whether dynamic system there is unusual condition, and abnormal vibration often indicates failure, vibration signal characteristics include the time, frequency, phase,
Period, amplitude（Energy）Deng making diagnosis for the physical parameter of mechanical equipment to identify.Such as application No. is
A kind of smart machine detection method is referred in the patent of CN201610100228, to be carried out to the operational situation of a shaft rotation equipment
Detection, the smart machine detection method include：The detecting shaft rotation equipment obtains an operating Dynamic Signal, for operating
It is corresponding several that Dynamic Signal frequency dividing calculates each bandwidth range for scheduled several bandwidth ranges
Characteristic value, wherein several characteristic values are respectively a root-mean-square value, a coefficient of kurtosis and a modulation value；And it is just each special
Value indicative by each bandwidth range corresponding several characteristic values respectively with corresponding to each bandwidth range
Several characteristic values individual baselines compare.In another example application No. is refer to that one kind is based in the patent of CN201110042898
The high ferro rail defects and failures detection method of vibration signal, including：Step 1: acquiring high ferro rail by vibration acceleration sensor
Vibration signal, and empirical mode decomposition is carried out to the vibration signal, obtain n IMF component and a residual error；Step 2: meter
Calculate step 1 obtain n IMF component with decomposition before collected vibration signal relative coefficient ui (i=1,2 ...,
N), IMF components of the relative coefficient ui more than threshold value λ is chosen as hurt characteristic information IMF；Step 3: calculating separately step
The power spectral density of the two hurt characteristic information IMF obtained, Step 4: according to the hurt characteristic information IMF's of step 3 acquisition
Power spectral density determines high ferro rail defects and failures position, completes the detection of high ferro rail defects and failures.
The method or apparatus that the operation conditions of equipment is judged according to electrical parameter is not referred in the prior art.Existing work
Industry equipment all has electrical parameter, such as pulse signal, analog sampling signal etc., and the electrical parameter of all types of industries equipment is not quite similar,
Also imply that pulse signal, analog signal have device class fingerprint characteristic, therefore by electric signal come detection device type,
Operating status is feasible.And temporarily disclosure or usage record without such technology in the prior art.
Invention content
The object of the present invention is to provide a kind of method and devices judging equipment operation condition according to electrical parameter, according to number
The feedback response degree of wear of model is learned, and can further judge whether equipment is replaced, the degree of wear.
For this purpose, present invention firstly provides a kind of method judging equipment operation condition according to electrical parameter, including it is following
Step：Step 100：Obtain the electric signal of equipment；Step 200：The electrical parameter mark sheet of equipment is obtained using the electric signal of equipment
Show；Step 300：Electrical parameter feature is analyzed, and judges whether exception.
The electric signal includes high-frequency pulse signal, and/or low frequency pulse signal, and/or analog sampling signal, the electricity
Parameter includes high-frequency impulse parameter, low-frequency pulse parameter, analog sampling signal parameter.
Preferably, in step 200, show the electrical parameter feature by patterned way, and/or by parameter come
Indicate the electrical parameter feature.
Further, in the step 300, electrical parameter curve graph is first obtainedW, by electrical parameter curve graphWJoin with benchmark electricity
Number figureW R It is compared, according toWWithW R The difference size of waveform judge whether the working condition of equipment normal.
Without limitation, in step 300, judge each high-frequency pulse signalH 1 、H 2 、H 3 ……H n With benchmark high-frequency impulse
Signal parameterH 1R 、H 2R 、H 3R ……H nR Absolute value of the difference|H 1 -H 1R |＜ threshold valuesδ h1 、|H 2 -H 2R |＜ threshold valuesδ h2 、……|H n - H nR |＜ threshold valuesδ hn Whether the working condition of the equipment is judged at Rob Roy.And further judge each low frequency pulse signal parameterL 1 、L 2 、L 3 ……L m With benchmark low frequency pulse signal parameterL 1R 、L 2R 、L 3R ……L mR Absolute value of the difference|L 1- L 1R |＜ threshold valuesδ L1 、|L 2 -L 2R |＜ threshold valuesδ L2 、……|L m -L mR |＜ threshold valuesδ Lm Whether the working condition of the equipment is judged at Rob Roy.And into
One step judges each analog sampling signalM 1 、M 2 、M 3 ……M k With benchmark simulation sampled signal parameterM 1R 、M 2R 、M 3R ……M kR Difference
Absolute value|M 1- M 1R |＜ threshold valuesδ M1 、|M 2 -M 2R |＜ threshold valuesδ M2 、……|M k -M kR |＜ threshold valuesδ MK Whether judge at Rob Roy should
The working condition of equipment.
Optionally, by calculating each electrical parameter plus the base for subtracting the electrical parameter after the corresponding error compensation value of the electrical parameter
The absolute value of quasi- electrical parameter judges whether equipment breaks down.
Schematically, the high-frequency pulse signal parameter includes pulse rise timet1, pulse widtht2, when pulse declines
Betweent3, impulse amplitudeU1, pulse top breadthU2。
The present invention also provides a kind of devices judging equipment operation condition according to electrical parameter, for realizing the present invention's
The above method.The device includes electrical parameter acquisition component, electrical parameter tracing analysis component, analysis result judgement part；The electricity
The electric signal of parameter acquisition component retrieval equipment；The electricity that the electrical parameter analysis component obtains equipment using the electric signal of equipment is joined
Number feature；The analysis result judgement part analyzes electrical parameter feature, and judges whether exception.
The present invention creatively judges the working condition of equipment by the electrical parameter of industrial equipment, is joined according to each real-time electricity
Number and the relationship between electric value and error compensation value judge whether equipment breaks down, or judge its abrasion
Degree, and can realize maintenance prompt etc. functions, compared with the existing technology in vibration detection for, technology realize it is more simple,
Cost is more cheap, and operability is more preferable.
Description of the drawings
Fig. 1 is the method schematic diagram that the present invention judges equipment operation condition according to electrical parameter；
Fig. 2 is high-frequency signal curve synoptic diagram of the present invention by taking bender as an example；
Fig. 3 is high-frequency signal curve synoptic diagram of the present invention by taking electric boiler as an example；
Fig. 4 is low frequency signal curve synoptic diagram of the present invention by taking bender as an example；
Fig. 5 is low frequency signal curve synoptic diagram of the present invention by taking electric boiler as an example；
Fig. 6 is the high-frequency pulse signal curve synoptic diagram of first state of the present invention by taking a certain particular device as an example；
Fig. 7 is the high-frequency pulse signal curve synoptic diagram of second state of the present invention by taking a certain particular device as an example；
Fig. 8 is the logical construction schematic diagram that the present invention judges the device of equipment operation condition according to electrical parameter.
Specific implementation mode
Below in conjunction with attached drawing and the embodiment provided, the present invention is further illustrated, and however, it is not limited to this.
The first embodiment of the present invention provides a kind of method judging equipment operation condition according to electrical parameter.Such as figure
Shown in 1, this approach includes the following steps：
Step 100：Obtain the electric signal of equipment.Preferably, the electric signal includes high-frequency pulse signal, and/or low-frequency pulse
Signal, and/or analog sampling signal（For example, 0-24v voltage signals）.The electric signal can be acquired by sensor,
Such as high-frequency pulse signal sensor, low frequency pulse signal sensor, analog sampling signal transducer.The high-frequency pulse signal
Sensor, low frequency pulse signal sensor, analog sampling signal transducer can be fixedly mounted on each industrial equipment, can also be led to
Cross the form connection controller of industrial equipment of circumscription socket, on microcontroller.
Further, the process of the electric signal for obtaining equipment can be continuous, and can also be discontinuous.Such as it can
With in continuous a period of time（One hour, one day, a week, one month etc.）The interior electric signal for obtaining equipment, can also be spaced one
The section time（For example, at interval of 3 hours, 24 hours etc.）Obtain the electric signal of equipment.
Step 200：The electrical parameter character representation of equipment is obtained using the electric signal of equipment.Preferably, figure can be passed through
Change mode shows the electrical parameter feature, can also indicate the electrical parameter feature with parameter.Without limitation, the electricity
Parameter curve includes high-frequency pulse signal curve, low frequency pulse signal curve, analog sampling signal curve.Because of the use of various kinds of equipment
Electrical feature, operation characteristic are different, therefore its electric signal has differences.As shown in Figures 2 and 3, Fig. 2 schematically shows foldings
The curve of high-frequency pulse signal when bender works, the curve of high-frequency pulse signal when Fig. 3 schematically shows electric boiler work.
Because the variation of similar square wave is presented in high-frequency pulse signal when bender works, and high-frequency pulse signal is then presented when electric boiler work
The change procedure increase sharply, is steady, declining, stablize.Fig. 4 schematically shows the songs of bender operation low frequency pulse signal
Line, low frequency pulse signal curve when Fig. 5 schematically shows electric boiler work.Analog sampling signal can be voltage signal,
As high-frequency pulse signal, low frequency pulse signal, the analog sampling signal curve of various kinds of equipment is also not quite similar, in the present invention
In no longer show.
Above-mentioned bender and electric boiler are the difference of electric signal between schematically illustrating all types of industries equipment, not
The restrictive embodiment of the present invention.It can be further deep into the step of electric signal often it is further preferable that the present invention acquires
Each consuming parts of one equipment, and, each component with electricity feedback of each equipment（Such as servo motor, transmission
Motor, inductance or even sensor etc.）The acquisition of high-frequency pulse signal, low frequency pulse signal, analog sampling signal can be carried out,
In this way, the electric signal curve of each component can be obtained.
Step 300：Electrical parameter feature is analyzed, and judges whether exception.In general, an equipment or even its each component
It can maintain a relatively stable state at runtime, therefore its electrical parameter curve is also stablized relatively, but work as the equipment or the equipment
Some electric feedback element operation when breaking down, electrical parameter curve also will present unusual condition, therefore pass through electrical parameter
Curve can determine whether the operation of the equipment and its component is normal.Can being indicated with each characteristic value for electrical parameter, can also use
Pulse curve indicates.
By taking high-frequency pulse signal as an example, as shown in fig. 6, Fig. 6 shows the high-frequency pulse signal schematic diagram of a certain equipment,
The high-frequency pulse signal of most of equipment, corresponding parameter pulse rise time can be representedt1, pulse widtht2, pulse decline
Timet3, impulse amplitudeU1, pulse top breadthU2.For stable equipment,t1、t2、t3、U1、U2Etc. features
Parameter is basicly stable, and parameter when stable state becomes basic parameter, uses respectivelyt1 R 、t2 R 、t3 R 、U1 R 、U2 R It indicates, wave
Shape is also basicly stable, and oscillogram is usedW R It indicates.
Fig. 7 shows the oscillogram with another moment of the same equipment of Fig. 6, at the moment, impulse amplitudeU1Compared to benchmark arteries and veins
Rush amplitudeU1 R Numerical value occur variation, and|U1-U1 R |＜ threshold valuesδ U1 , it is therefore shown that the equipment has been likely to occur abnormal shape
Condition.
It is further preferable that can judge respectively|t1-t1 R |＜ threshold valuesδ t1 、|t2-t2 R |＜ threshold valuesδ t2 、|t3-t3 R |＜ thresholds
Valueδ t3 、|U1-U1 R |＜ threshold valuesδ U1 、|U2-U2 R |＜ threshold valuesδ U2 It is whether true, if setting up, show the equipment normal operation；
If not, or which part is invalid, then it is abnormal to show that the equipment occurs.Above-mentioned each threshold value can be according to the kind of equipment
Class, the type of parameter and set.
Further, it can judge the type of unit exception according to the absolute difference of above-mentioned each discriminate, such as
For heating class industrial equipment,|U1-U1 R |It is excessive, then it can be shown that heater does not work, for impact class industrial equipment
Speech,|t1-t1 R |It is excessive, then it can be shown that dynamical system breaks down.For other equipment, wherein some parameter value
Changing excessive may represent it and occur failure in some aspects.
On the other hand, can by the combination failure judgement type of above-mentioned each discriminate, such as|t1-t1 R |＜ threshold valuesδ t1 、|t2-t2 R |＜ threshold valuesδ t2 It sets up, and|t3-t3 R |＜ threshold valuesδ t3 、|U1-U1 R |＜ threshold valuesδ U1 、|U2-U2 R |＜ threshold valuesδ U2 Not at
It is vertical, then represent a kind of failure；|t1-t1 R |＜ threshold valuesδ t1 、|t2-t2 R |＜ threshold valuesδ t2 、|t3-t3 R |＜ threshold valuesδ t3 It sets up, and| U1-U1 R |＜ threshold valuesδ U1 、|U2-U2 R |＜ threshold valuesδ U2 It is invalid, then represent another kind of failure.Those skilled in the art should
Understand, simultaneously non-present invention can be exhausted for specific fault type, and one of spirit of the invention is the difference using various kinds of equipment
The variation of the electrical parameter of electric signal judges whether it is working properly.
More generalizedly, high-frequency impulse parameter, low-frequency pulse parameter, analog sampling can be defined for every a kind of equipment
Signal parameter.For example, for certain a kind of equipment, high-frequency pulse signal parameter includesH 1 、H 2 、H 3 ……H n , the high frequency arteries and veins
The high-frequency signal feature of the equipment can be reflected by rushing signal parameter, can determine whether each high-frequency pulse signal and benchmark high-frequency pulse signal
ParameterH 1R 、H 2R 、H 3R ……H nR Absolute value of the difference|H 1 -H 1R |＜ threshold valuesδ h1 、|H 2 -H 2R |＜ threshold valuesδ h2 、……|H n -H nR |＜
Threshold valueδ hn Whether at Rob Roy judge which the equipment exception occur in terms of.Its low frequency pulse signal parameter includesL 1 、L 2 、 L 3 ……L m , the low frequency pulse signal parameter can reflect the low frequency signal signature of the equipment, can determine whether each low frequency pulse signal
With benchmark low frequency pulse signal parameterL 1R 、L 2R 、L 3R ……L mR Absolute value of the difference|L 1- L 1R |＜ threshold valuesδ L1 、|L 2 -L 2R |＜ thresholds
Valueδ L2 、……|L m -L mR |＜ threshold valuesδ Lm Whether at Rob Roy judge which the equipment exception occur in terms of；Its analog sampling
Signal parameter includesM 1 、M 2 、M 3 ……M k , the analog sampling signal parameter can reflect that the analog sampling signal of the equipment is special
Sign, can determine whether each analog sampling signal and benchmark simulation sampled signal parameterM 1R 、M 2R 、M 3R ……M kR Absolute value of the difference|M 1- M 1R |＜ threshold valuesδ M1 、|M 2 -M 2R |＜ threshold valuesδ M2 、……|M k -M kR |＜ threshold valuesδ MK Whether judge the equipment in which side at Rob Roy
There is exception in face.
In addition, the above-mentioned technical proposal of the present invention not only may determine that the fault state of equipment, equipment can also be judged
Abrasion or extent of deterioration.For most equipment, the components such as motor, gear, bearing can all have loss or mill
Damage, these abrasions can gradually embody in accumulating over a long period, and these abrasions or loss also result in the variation of its electrical parameter, because
This judges that the difference between its electrical parameter and electric value may determine that the degree of wear of its corresponding component.
More preferably, it is contemplated that the electricity consumption situation of each period is different, such as power supply caused by network load difference
Transformation system in voltage differences, each factory is unstable cause industrial equipment input voltage difference, therefore, above-mentioned discriminate
In result can be influenced by input voltage.It is further contemplated that having arrived this factor, and judging whether equipment goes out
When existing failure, error compensation parameter is introduced.For example, for judging|U1-U1 R |＜ threshold valuesδ U1 When, introduce compensating parameterσ, will| U1-U1 R |＜ threshold valuesδ U1 It is revised as|U1+σ U1 -U1 R |＜ threshold valuesδ U1 , it is also similar for other parameters, for example, will|t1-t1 R |＜
Threshold valueδ t1 It is revised as|t1+σ t1 -t1 R |＜ threshold valuesδ t1 , above-mentioned compensating parameter σ is different because of equipment, can because of the component of equipment
To be obtained by experience, it can also be calculated and be obtained by linear regression method.
Optionally, because parameter is the expression of graphic feature, and figure is more generalized, differentiates except through above-mentioned parameter
Further include signature analysis except method, in technical scheme of the present invention, in this method, first obtains electrical parameter curve graphW, electricity is joined
Number curve figureWWith electric value figureW R It is compared, according toWWithW R The difference size of waveform judge the working condition of equipment
It is whether normal.
As shown in figure 8, the present invention also provides a kind of device judging equipment operation condition according to electrical parameter, for real
The above method of the existing present invention.The device includes electrical parameter acquisition component 1, electrical parameter tracing analysis component 2, analysis result judgement
Component 3.
The electrical parameter acquisition component 1 obtains the electric signal of equipment, and electrical parameter acquisition component 1 can be one or one group
Sensor, such as high-frequency pulse signal sensor, low frequency pulse signal sensor, analog sampling signal transducer.The high frequency
Pluse signal sensor, low frequency pulse signal sensor, analog sampling signal transducer can be fixedly mounted on each industrial equipment,
The controller of industrial equipment can also be connected by the form of circumscription socket, on microcontroller.
The electrical parameter analysis component 2 obtains the electrical parameter feature of equipment using the electric signal of equipment.Preferably, Ke Yitong
Patterned way is crossed to show the electrical parameter feature, can also indicate electrical parameter feature by parameter.Without limitation, institute
It includes high-frequency pulse signal feature, low frequency pulse signal feature, analog sampling signal characteristic to state electrical parameter feature.
Analysis result judgement part 3 analyzes electrical parameter feature, and judges whether exception.In general, an equipment, or even
Its each component can maintain a relatively stable state at runtime, therefore its electric signal curve is also stablized relatively, but when the equipment or
When the electric feedback element operation of some of person's equipment is broken down, electric signal curve also will present unusual condition, therefore logical
It crosses electric signal curve and can determine whether the operation of the equipment and its component is normal.Electric signal can indicate with each characteristic value,
It can also be indicated with pulse curve.
The present invention judges the working condition of equipment by the electrical parameter of industrial equipment, according to each real-time electrical parameter and benchmark
Relationship between electrical parameter and error compensation value judges whether equipment breaks down, or judges the degree of its abrasion, phase
For vibration detection in the prior art, technology realization is more simple, and cost is more cheap, and operability is more preferable.
It is enlightenment with above-mentioned desirable embodiment according to the present invention, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to determine its technical scope according to right.
Claims (9)
1. a kind of method judging equipment operation condition according to electrical parameter, includes the following steps：
Step 100：Obtain the electric signal of equipment；
Step 200：The electrical parameter character representation of equipment is obtained using the electric signal of equipment；
Step 300：Obtain electrical parameter curve graphW, by electrical parameter curve graphWWith electric value figureW R It is compared, according toWWithW R The difference size of waveform judge whether the working condition of equipment normal.
2. the method for equipment operation condition is judged according to electrical parameter as described in claim 1, which is characterized in that the telecommunications
Number include high-frequency pulse signal, and/or low frequency pulse signal, and/or analog sampling signal, the electrical parameter include high-frequency impulse
Parameter, low-frequency pulse parameter, analog sampling signal parameter.
3. the method for equipment operation condition is judged according to electrical parameter as claimed in claim 2, which is characterized in that in step
In 200, the electrical parameter feature is shown by patterned way, and/or the electrical parameter feature is indicated by parameter.
4. the method for equipment operation condition is judged according to electrical parameter as claimed in claim 3, which is characterized in that in step
In 300, each high-frequency pulse signal is judgedH 1 、H 2 、H 3 ……H n With benchmark high-frequency pulse signal parameterH 1R 、H 2R 、H 3R ……H nR 's
Absolute value of the difference|H 1 -H 1R |＜ threshold valuesδ h1 、|H 2 -H 2R |＜ threshold valuesδ h2 、……|H n -H nR |＜ threshold valuesδ hn Whether judge at Rob Roy
The working condition of the equipment.
5. the method for equipment operation condition is judged according to electrical parameter as claimed in claim 4, which is characterized in that further sentence
Disconnected each low frequency pulse signal parameterL 1 、L 2 、L 3 ……L m With benchmark low frequency pulse signal parameterL 1R 、L 2R 、L 3R ……L mR Difference
Absolute value|L 1- L 1R |＜ threshold valuesδ L1 、|L 2 -L 2R |＜ threshold valuesδ L2 、……|L m -L mR |＜ threshold valuesδ Lm Whether at Rob Roy judge that this sets
Standby working condition.
6. the method for equipment operation condition is judged according to electrical parameter as claimed in claim 5, which is characterized in that further sentence
Break each analog sampling signalM 1 、M 2 、M 3 ……M k With benchmark simulation sampled signal parameterM 1R 、M 2R 、M 3R ……M kR Difference it is absolute
Value|M 1- M 1R |＜ threshold valuesδ M1 、|M 2 -M 2R |＜ threshold valuesδ M2 、……|M k -M kR |＜ threshold valuesδ MK Whether at Rob Roy the equipment is judged
Working condition.
7. the side for judging equipment operation condition according to electrical parameter as described in claim 4 or 5 or 6 any one claims
Method, which is characterized in that by calculating each electrical parameter plus the base for subtracting the electrical parameter after the corresponding error compensation value of the electrical parameter
The absolute value of quasi- electrical parameter judges whether equipment breaks down.
8. the side for judging equipment operation condition according to electrical parameter as described in claim 4 or 5 or 6 any one claims
Method, which is characterized in that the high-frequency pulse signal parameter includes pulse rise timet1, pulse widtht2, pulse fall timet3, impulse amplitudeU1, pulse top breadthU2。
9. a kind of device judging equipment operation condition according to electrical parameter, for realizing the above method of the present invention, the device
Including electrical parameter acquisition component（1）, electrical parameter tracing analysis component（2）, analysis result judgement part（3）；The electrical parameter is adopted
Collect component（1）Obtain the electric signal of equipment；The electrical parameter analysis component（2）The electricity ginseng of equipment is obtained using the electric signal of equipment
Number feature；The analysis result judgement part（3）Electrical parameter feature is analyzed, and judges whether exception.
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| CN109828146A (en) * | 2018-11-22 | 2019-05-31 | 常州天正工业发展股份有限公司 | A method of equipment working condition is judged by device electrical parameters AD sampling |
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| CN108459050B (en) | 2018-11-02 |
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