CN116908635A - Sensing acquisition and optical observation combined diagnosis method for liquid discharge pressure characteristics - Google Patents
Sensing acquisition and optical observation combined diagnosis method for liquid discharge pressure characteristics Download PDFInfo
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Abstract
The application discloses a sensing acquisition and optical observation combined diagnosis method for liquid discharge pressure characteristics, which comprises the following key steps: collecting pressure waveforms of the shock waves through the pressure sensor, and calculating propagation speed v of the shock waves according to time difference t between peaks of the voltage waveforms and peaks of the pressure waveforms and distance x between the pressure sensor and a discharge center; the camera shoots the discharge of the discharge center to form a discharge image, and the actual distance between two adjacent shock waves in the discharge image is determined according to the calibration value of the distance on the discharge imageThe method comprises the steps of carrying out a first treatment on the surface of the Based on the velocity v of propagation of the shock wave and the actual distanceCalculating the time difference between two adjacent shock wavesThe method comprises the steps of carrying out a first treatment on the surface of the Reading the time difference between the peaks of two adjacent shock waves of the pressure waveform acquired by the pressure sensor；And (3) withThe error of (2) is within a preset range, and the pressure waveform measured by the pressure sensor represents the liquid discharge pressure characteristic.
Description
Technical Field
The application relates to the technical field of liquid medium discharge characteristic detection, in particular to a sensing acquisition and optical observation combined diagnosis method for liquid discharge pressure characteristics.
Background
The discharge in the liquid medium generates a pressure change, which generates a shock wave. On one hand, the research on the pressure characteristics of discharge in a liquid medium provides a research thought for the improvement of blasting mechanics and discharge theory; on the other hand, the shock wave in the liquid medium can be used as a bursting pressure source in mining and also can be used as a main cause of the rupture of the transformer oil tank. Therefore, the method has important significance for pressure research of discharge in the liquid medium. However, in the actual research process, due to the principle, process and the like of the sensor and the influence of factors such as vibration, electromagnetic interference and the like, the collected pressure signals still have larger difference for the same discharging process. The optical observation technology is applied to the liquid discharge pressure experiment, and has the defect of incapability of quantitative measurement.
The information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects or drawbacks existing in the prior art, the combined diagnosis method for sensing acquisition and optical observation of the liquid discharge pressure characteristic is provided. The quantitative measurement of the discharge pressure wave can be realized, the visual shooting of the discharge pressure wave image can be realized, and the two observation methods are mutually verified and coupled.
The aim of the application is achieved by the following technical scheme.
The sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic comprises,
discharging the discharge center in the liquid, generating shock wave when the voltage waveform has peak, wherein the distance between the pressure sensor and the discharge center is x,
the high-voltage differential probe measures the peak of the voltage waveform, the pressure sensor collects the pressure waveform of the shock wave, and the propagation speed v of the shock wave is calculated according to the time difference t between the peak of the voltage waveform and the peak of the pressure waveform and the distance x between the pressure sensor and the discharge center;
the camera shoots the discharge of the discharge center to form a discharge image, and the actual distance between two adjacent shock waves in the discharge image is determined according to the calibration value of the distance on the discharge image；
Based on the velocity v of propagation of the shock wave and the actual distanceCalculating the time difference of two adjacent shock waves +.>，The method comprises the steps of carrying out a first treatment on the surface of the Reading the time difference between the peaks of two adjacent shock waves of the pressure waveform acquired by the pressure sensor +.>；
Selecting a time differenceDifference from time->The pressure waveform measured by the pressure sensor with the error within a preset range is used for representing the liquid discharge pressure characteristic.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristics, an oscilloscope is connected with a high-voltage differential probe to acquire discharge voltage signals.
In the liquid discharge pressure characteristic sensing acquisition and optical observation combined diagnosis method, the electrode gap and the electrode diameter of a discharge center are used as calibration references of calibration values, and the actual distance is calculated according to the shock wave pixel point spacing in a discharge image。
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic,and->Error of +.>The preset range is 10%.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic, the discharge center is the arc striking wire to trigger discharge, and at the moment of fusing the arc striking wire, the voltage is spiked and shock waves are generated.
In the liquid discharge pressure characteristic sensing acquisition and optical observation combined diagnosis method, the pressure sensor is a free-field pressure sensor.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic, the pressure sensor is a piezoelectric sensor and comprises a piezoelectric crystal, and positive and negative polarization charges of the first pressure sensor are in linear relation with the pressure born by the piezoelectric crystal.
Compared with the prior art, the beneficial effects that this disclosure brought are:
the method and the device have the advantages that the discharged pressure waveform is coupled and corresponds to the high-speed shot image, so that the shock wave peak value can be quantitatively measured, and the distribution condition of the pressure field can be visually displayed through the high-speed image.
The description is merely an overview of the technical solutions of the present application, in order to make the technical means of the present application more clearly apparent to those skilled in the art, and in order to make the description of the present application and other objects, features and advantages of the present application more obvious, the following description of the specific embodiments of the present application will be exemplified.
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Various other advantages and benefits of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. It is evident that the figures described below are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic flow chart of a combined sensing acquisition and optical observation diagnosis method for liquid discharge pressure characteristics;
FIG. 2 is a schematic diagram of an oscilloscope acquired discharge voltage waveform and pressure waveform;
FIG. 3 is a schematic view of a discharged high speed camera captured image;
fig. 4 is a schematic diagram of a shadow observation of discharge.
The application is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the application are shown in the drawings, it should be understood that the application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to predetermined components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description proceeds with reference to the general principles of the description. The scope of the application is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the application, reference will now be made to the drawings of several embodiments illustrated in the drawings, and the accompanying drawings are not to be taken as limiting the embodiments of the application.
For better understanding, as shown in fig. 1 to 4, a combined sensing and optical observation diagnosis method of liquid discharge pressure characteristics includes,
discharging the discharge center in the liquid, generating shock wave when the voltage waveform has peak, wherein the distance between the pressure sensor and the discharge center is x,
the high-voltage differential probe measures the peak of the voltage waveform, the pressure sensor collects the pressure waveform of the shock wave, and the propagation speed v of the shock wave is calculated according to the time difference t between the peak of the voltage waveform and the peak of the pressure waveform and the distance x between the pressure sensor and the discharge center;
the camera shoots the discharge of the discharge center to form a discharge image, and the actual distance between two adjacent shock waves in the discharge image is determined according to the calibration value of the distance on the discharge image；
Based on the velocity v of propagation of the shock wave and the actual distanceCalculating the time difference of two adjacent shock waves +.>，The method comprises the steps of carrying out a first treatment on the surface of the Reading the time difference between the peaks of two adjacent shock waves of the pressure waveform acquired by the pressure sensor +.>；
Selecting a time differenceDifference from time->The pressure waveform measured by the pressure sensor with the error within a preset range is used for representing the liquid discharge pressure characteristic.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristics, an oscilloscope is connected with a high-voltage differential probe to acquire discharge voltage signals.
In the liquid discharge pressure characteristic sensing acquisition and optical observation combined diagnosis method, the electrode gap and the electrode diameter of a discharge center are used as calibration references of calibration values, and the actual distance is calculated according to the shock wave pixel point spacing in a discharge image。
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic,and->Error of +.>The preset range is 10%.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic, the discharge center is the arc striking wire to trigger discharge, and at the moment of fusing the arc striking wire, the voltage is spiked and shock waves are generated.
In the liquid discharge pressure characteristic sensing acquisition and optical observation combined diagnosis method, the pressure sensor is a free-field pressure sensor.
In the sensing acquisition and optical observation combined diagnosis method of the liquid discharge pressure characteristic, the pressure sensor is a piezoelectric sensor and comprises a piezoelectric crystal, and positive and negative polarization charges of the first pressure sensor are in linear relation with the pressure born by the piezoelectric crystal.
In one embodiment, as shown in fig. 1, a liquid discharge pressure characteristic sensing acquisition and optical observation combined diagnosis method includes:
according to the time difference t of the peak of the voltage waveform and the peak of the pressure waveform, calculating the propagation speed v of the shock wave by combining the distance x from the sensor to the discharge center;
determining the actual distance of the shock wave in the discharge image according to the calibration value of the distance on the discharge image；
Calculating the time difference of two adjacent shock waves according to the propagation speed of the shock wavesThe method comprises the steps of carrying out a first treatment on the surface of the Reading the time difference between the peaks of two adjacent shock waves of the pressure wave acquired by the pressure sensor +.>；
And->The method is described as being correct when the error is within a predetermined range, and it is understood that the case of the error means a relatively severe requirement, and therefore, the error is preferably within a predetermined range. Exemplary, as previously described, < >>And (3) withIs within a preset range of 10%. Thus, choose the time difference +.>Difference from time->The pressure waveform measured by the pressure sensor with the error within a preset range is used for representing the liquid discharge pressure characteristic.
Preferably, the peak of the voltage waveform is obtained by measuring a high-voltage differential probe, and the oscilloscope collects the measured discharge voltage signal. The discharge voltage signal has obvious characteristics when the shock wave is generated, and can be used as a mark of the generation time of the shock wave.
The pressure wave waveform is obtained by measuring a PCB pressure sensor and is collected by an oscilloscope, the peak of the pressure waveform is a pressure waveform signal obtained by measuring the pressure sensor, and the time corresponding to the peak of the collected pressure waveform is the time when the shock wave propagates to reach the pressure sensor. The distance from the sensor to the discharge center is a set value, which is a preset known value before discharge. Thereby, the propagation velocity of the shock wave can be calculated. The discharge image is obtained by a shadow method and photographed using a high-speed camera. The electrode gap, the electrode diameter and the like are all preset known values and can be used as calibration references of high-speed images. After the calibration relation between the high-speed image pixel point and the actual distance is obtained, calculating the actual distance of two adjacent shock waves according to the distance between the shock wave pixel points in the high-speed image>。
In this embodiment, the time difference between the peak of the voltage waveform and the peak of the sensor waveform can be determined by fig. 2. In this embodiment, the voltage waveform of the liquid arc discharge is shown as a red curve in the figure, the discharge is initiated by using the striking wire, and at the moment of fusing the striking wire, the voltage is spiked, and at the same time, a shock wave is generated. The dash-dot line waveform is the pressure waveform acquired by the pressure sensor, with the peak of the first pressure waveform occurring at a time later than the peak 272 of the voltage shown in solid lineI.e. +.>. In the experiment, the sensor arranged is located +.>Shock wave propagation speed +.>。
In the present embodiment, a discharge image obtained by a high-speed camera is shown in fig. 3. In FIG. 3, the diameter of the cylindrical electrode is 30mm, which can be used as a calibration value for the distance on the image, and the calibration result shows that the spatial resolution of the image is 0.43mm/pixel. In FIG. 3, the outline of the outermost circle is the first shock wave image, the inner circle is the second shock wave image, and the two images are separated from each other，
In this embodiment, the time difference between two adjacent impact peaks is calculated. The peak time difference of two adjacent shockwaves read out by means of fig. 2 +.>，
In the present embodiment of the present application, in the present embodiment,the time differences calculated by the two methods are basically identical, which indicates that the method is correct. The pressure waveform measured by the pressure sensor characterizes the liquid discharge pressure characteristic.
As shown in fig. 4, the present disclosure overcomes the drawbacks of the current arc discharge experimental platform in oil, and provides an experimental platform which is convenient for experimental operation and can perform optical observation, and has the advantages of simple structure and intuitive effect. In fig. 4, from left to right, there are provided: xenon lamp light source, focusing lens, diaphragm, lens, discharge area, lens, diaphragm, high-speed camera. The application can be used for researching arc mechanism in oil, and researching arc decomposition gas, thereby saving experimental cost, being simple and easy to implement and being convenient to popularize and use.
The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (7)
1. A sensing acquisition and optical observation combined diagnosis method for liquid discharge pressure characteristics is characterized by comprising the following steps,
discharging the discharge center in the liquid, generating shock wave when the voltage waveform has peak, wherein the distance between the pressure sensor and the discharge center is x,
the high-voltage differential probe measures the peak of the voltage waveform, the pressure sensor collects the pressure waveform of the shock wave, and the propagation speed v of the shock wave is calculated according to the time difference t between the peak of the voltage waveform and the peak of the pressure waveform and the distance x between the pressure sensor and the discharge center;
the camera shoots the discharge of the discharge center to form a discharge image, and the actual distance between two adjacent shock waves in the discharge image is determined according to the calibration value of the distance on the discharge image；
Based on the velocity v of propagation of the shock wave and the actual distanceCalculating the time difference of two adjacent shock waves +.>，/>The method comprises the steps of carrying out a first treatment on the surface of the Reading the time difference between the peaks of two adjacent shock waves of the pressure waveform acquired by the pressure sensor +.>；
Selecting a time differenceDifference from time->The pressure waveform measured by the pressure sensor with the error within a preset range is used for representing the liquid discharge pressure characteristic.
2. The combined sensing and optical observation diagnostic method for the discharge pressure characteristics of a liquid according to claim 1, wherein an oscilloscope is connected to the high-voltage differential probe to collect the discharge voltage signal.
3. The combined sensing, collecting and optically observing and diagnosing method for liquid discharge pressure characteristic as set forth in claim 1, wherein electrode gap and electrode diameter of discharge center are used as calibration reference of calibration value, said actual distance is calculated based on the distance between shock wave pixels in discharge image。
4. The method for combined sensing and optical observation diagnosis of liquid discharge pressure characteristics according to claim 1, wherein the time differenceDifference from time->Error of +.>The preset range is 10%.
5. The method for combined sensing, collecting and optical observing and diagnosing the pressure characteristic of liquid discharge according to claim 1, wherein the discharge center is an arc striking wire for initiating discharge, and the voltage is spiked and shock waves are generated at the moment of fusing the arc striking wire.
6. The combined sensing and optical observation diagnostic method for the pressure characteristics of liquid discharge according to claim 1, wherein the pressure sensor is a free-field pressure sensor.
7. The combined sensing, collecting and optically observing and diagnosing method for liquid discharge pressure characteristic according to claim 6, wherein said pressure sensor is a piezoelectric sensor comprising a piezoelectric crystal, and the positive and negative polarization charges of the first pressure sensor are in linear relation with the pressure applied to the piezoelectric crystal.
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