CN119197966A - An impact test method for a new 10kV pole-mounted vacuum circuit breaker visible base - Google Patents
An impact test method for a new 10kV pole-mounted vacuum circuit breaker visible base Download PDFInfo
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Abstract
The invention relates to the technical field of impact test, in particular to an impact test method for a novel 10kV column vacuum circuit breaker visual base. The method comprises the steps of obtaining impact difference indexes according to the similarity of a vibration extremum sequence of each impact test and a previous impact test and the difference of vibration characteristic indexes, obtaining critical impact energy of a normal test by combining the similarity of the vibration extremum sequence of the impact test and a comparison impact test in the normal test and the difference of the vibration characteristic indexes, obtaining critical impact energy of the interference test according to the time interval between the impact test and the previous impact test and the difference of the vibration duration of the comparison impact test in the interference test and the impact difference indexes, and judging the impact quality of a visual base by combining the critical impact energy of all the tests and the impact energy of the impact test. According to the invention, the impact test of the visual base under different impact environments is simulated, and the accuracy of impact resistance quality judgment of the visual base is improved.
Description
Technical Field
The invention relates to the technical field of impact test, in particular to an impact test method for a novel 10kV column vacuum circuit breaker visual base.
Background
The vacuum circuit breaker is an important control and protection electric appliance in a power system, the safety and reliability of the vacuum circuit breaker are directly related to the stable operation of the power system, and the column vacuum circuit breaker plays a vital role in a power distribution system of a transformer substation and an industrial and mining enterprise. When the power is turned on or off, the instantaneous current or voltage generated by the instantaneous change of the power voltage can generate stronger impact force, and the visual base of the vacuum circuit breaker can not bear the stronger impact force to cause faults, thereby affecting the normal operation of the power system. In order to improve the overall performance and extend the service life of the vacuum circuit breaker, it is necessary to perform an impact test on the visual base of the vacuum circuit breaker on the column.
The impact test is usually carried out on the object by the prior method, namely, the next impact test is carried out after the vibration of the object is stopped after the completion of one impact test, but in the actual situation, the instantaneous current or voltage generated by the instantaneous change of the power supply voltage can carry out high-frequency continuous impact on the visual base, so that the impact energy is continuously accumulated, and the impact quality of the visual base of the column vacuum circuit breaker measured in the impact environment of carrying out the next impact test after the completion of one impact test is inaccurate.
Disclosure of Invention
In order to solve the technical problem that impact energy is accumulated continuously by performing high-frequency impact test on a visual base, so that the accuracy rate of impact resistance quality analysis on the visual base is low, the invention aims to provide an impact test method for a novel 10kV on-column vacuum circuit breaking visual base, which adopts the following specific technical scheme:
The invention provides an impact test method for a novel 10kV column vacuum circuit breaker visual base, which comprises the following steps:
Obtaining a vibration extremum sequence of impact tests of different impact energies of a visual base of the vacuum circuit breaker on a column in a plurality of tests, wherein the types of the tests comprise a normal type and an interference type, and the test sequence of the normal type test is before the interference type test;
obtaining the impact difference index of each impact test according to the similarity of the vibration extremum sequence of each impact test and the previous impact test and the difference of the vibration characteristic index;
Obtaining critical impact energy of each normal test according to the similarity between each impact test and the vibration extremum sequence of the control impact test and the difference of the vibration characteristic index in each normal test and the impact difference index of each impact test;
Obtaining critical impact energy of each interference type test according to the difference between the time interval between each impact test and the previous impact test and the vibration duration of the control impact test of the previous impact test in each interference type test and the impact difference index of each impact test;
And judging the impact resistance quality of the visual base according to the time intervals of adjacent impact tests in all tests, the impact energy of each impact test and the critical impact energy.
Further, the obtaining the vibration characteristic index of each impact test includes:
the vibration data in the vibration extremum sequence has corresponding time;
obtaining a local vibration value of each vibration data in each vibration extremum sequence according to the time interval between each vibration data in each vibration extremum sequence and the corresponding moment of the next adjacent vibration data and each vibration data;
taking the accumulated sum of the local vibration values of the rest vibration data except the last vibration data in the vibration extremum sequence of each impact test as the comprehensive vibration value of each impact test;
and obtaining vibration characteristic indexes corresponding to the impact tests according to the vibration duration of each impact test and the comprehensive vibration value.
Further, the obtaining the impact difference index of each impact test includes:
Marking all impact tests in each test in the two-dimensional coordinate system to obtain coordinate points, performing curve fitting on the coordinate points in the two-dimensional coordinate system, and recording the obtained fitting curve as a vibration characteristic curve of each test;
Taking the difference between the slope of the corresponding point of each impact test and the vibration characteristic curve of the previous impact test in the test where each impact test is located as the vibration characteristic change rate of each impact test;
Acquiring the DTW distance between each impact test and the vibration extremum sequence of the previous impact test, and recording the DTW distance as a local difference index corresponding to the two impact tests;
and obtaining the impact difference index of each impact test according to the vibration characteristic change rate and the local difference index.
Further, the acquiring critical impact energy of each normal test includes:
Taking the impact difference index of each impact test in the first normal test as a first critical possibility of the corresponding impact test;
For impact tests in normal tests except for a first normal test, acquiring a fluctuation specific index of each impact test according to the difference between the local difference index and the vibration characteristic index of each impact test and the control impact test;
and acquiring critical impact energy of each test according to the first critical possibility of all impact tests in each normal test.
Further, the acquiring critical impact energy of each interference test includes:
For impact tests in all interference tests, acquiring the integral comparison vibration duration of each impact test according to the vibration duration of the comparison impact test of each impact test;
Taking the absolute value of the difference between the time interval between each impact test and the previous impact test and the integral comparison vibration duration of the previous impact test as an energy accumulation value of each impact test;
Acquiring a second critical probability of each impact test according to the energy accumulation value and the impact difference index of each impact test, wherein the energy accumulation value and the second critical probability are in a negative correlation, and the impact difference index and the second critical probability are in a positive correlation;
and acquiring critical impact energy of each test according to the second critical possibility of all impact tests in each interference type test.
Further, the acquiring critical impact energy for each test includes:
recording the first critical probability and the second critical probability as analysis critical probability;
And judging the analysis critical probability of the impact test in each test with a preset critical threshold value in sequence according to the order of the impact energy from small to large until the analysis critical probability is larger than the preset critical threshold value, and stopping judging, wherein the analysis critical probability in the stopping judging corresponds to the impact energy of the impact test and is used as the critical impact energy of each test.
Further, the determining the impact resistance quality of the visual base according to the time interval between adjacent impact tests in all the tests, the impact energy of each impact test, and the critical impact energy includes:
For each test impact test, recording the critical impact energy of each test corresponding to the impact test before the impact test as the analysis test of each test;
Obtaining the local accumulated impact degree of each analysis test according to the time interval between each analysis test and the next impact test and the impact energy of each analysis test in each test;
According to the integral accumulated impact degree and critical impact energy of each test, obtaining the local impact degree of each test;
and judging the impact resistance quality of the visual base according to the impact resistance index.
Further, the determining the impact resistance quality of the visual base according to the impact resistance index includes:
And when the impact resistance index is smaller than or equal to the preset qualification threshold, the impact resistance quality of the visual base of the on-column vacuum circuit breaker is not qualified.
Further, the impact energy of each impact test is equal to that of its control impact test, the test sequence of the test in which the control impact test is located before the test in which each impact test is located, and the control impact test is in a normal test.
Further, the obtaining the fluctuation specific index of each impact test according to the difference between the local difference index and the vibration characteristic index of each impact test and the control impact test comprises the following steps:
Selecting one impact test from normal tests except the first normal test as a target test, and acquiring initial specific indexes of the target test and each comparison impact test according to the difference between the target test and the local difference index and the vibration characteristic index of each comparison impact test;
The average value of the initial specific indexes of the target test and all the control impact tests is recorded as the comprehensive specific index of the target test;
and acquiring the fluctuation specific index of the target test according to the comprehensive specific index and the discrete index.
The invention has the following beneficial effects:
In the embodiment of the invention, the visible base of the vacuum circuit breaker on the column simulates impact information under different impact environments, the fluctuation condition and vibration characteristic index of vibration data in a vibration extremum sequence reflect the vibration attenuation condition of the impact test, the similarity of the vibration extremum sequence of each impact test and the previous impact test and the difference of vibration characteristic index are reflected, the difference of the vibration attenuation condition of the two impact tests is presented, the impact difference index is obtained by analysis, the possibility that the impact energy of the impact test reaches the bearing critical condition of the visible base is measured, the similarity of the vibration extremum sequence of each impact test and the comparison impact test and the difference of the vibration characteristic index in the normal test reflect the similarity of the vibration attenuation degree under the same impact energy, the vibration specificity under the impact energy is presented, the impact difference index analysis is combined, the accuracy of the critical impact energy analysis of the normal test is improved, the impact test can be generated by the accumulated fatigue, the vibration duration of the impact test is the vibration duration required by the impact test and the previous impact test, the impact test is combined with the impact critical impact test, the impact test can be combined with the impact test, the impact fatigue condition of the impact test is accumulated, the impact test is combined with the impact test has the impact condition of the impact condition, the impact test has the impact time is accumulated, the impact test has the impact time is greatly has the impact fatigue is accumulated, and the impact time is greatly has the impact time, the accuracy of the impact resistance quality of the visual base under the complex impact environment is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the steps of a method for impact testing of a novel 10kV on-column vacuum circuit breaker vision base according to one embodiment of the present invention;
FIG. 2 is a block diagram of an impact test system for a novel 10kV on-column vacuum circuit breaker visual base according to one embodiment of the present invention;
Fig. 3 is a schematic diagram of a computer device for a novel impact test device for a vacuum circuit breaker on 10kV column visual base according to an embodiment of the invention.
Detailed Description
In order to further illustrate the technical means and effects adopted by the invention to achieve the preset aim, the following description refers to the specific implementation, structure, characteristics and effects of an impact test method for a novel 10kV on-column vacuum circuit breaker visual base according to the invention in combination with the accompanying drawings and the preferred embodiment. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention provides a specific scheme for an impact test method for a novel 10kV column vacuum circuit breaker visual base, which is specifically described below with reference to the accompanying drawings.
Example 1:
The invention provides an impact test method for a novel 10kV column vacuum circuit breaker visual base, referring to fig. 1, which shows a step flow chart of an impact test method for the novel 10kV column vacuum circuit breaker visual base, wherein the method comprises the following steps:
step S1, obtaining a vibration extremum sequence of impact tests of different impact energies of a visual base of the vacuum circuit breaker on a column in a plurality of tests, wherein the test types comprise a normal type and an interference type, and the test sequence of the normal type test is before the interference type test.
Specifically, the visual base of the vacuum circuit breaker on the column is fixed on a bracket or a support of the impact testing machine, and a vibration sensor is arranged on the visual base and used for collecting vibration data generated after the visual base is impacted. And lifting the pendulum bob of the impact testing machine to a certain height to release, so as to impact the visual base, performing one-time impact on the visual base to obtain one-time impact test, and taking the descending height of the pendulum bob during each impact test as the impact energy of the corresponding impact test.
The time period between each impact test of the visual base and the moment when the next impact test begins is recorded as the analysis time period of each impact test, and vibration data of the vibration sensor on the visual base at all moments in the analysis time period are obtained. In this embodiment, a rectangular coordinate system is established with time as a horizontal axis and vibration data as a vertical axis, vibration data at all times in an analysis time period are marked in the rectangular coordinate system to obtain coordinate points, a fitting curve obtained by curve fitting all coordinate points in the rectangular coordinate system is recorded as a vibration curve, and vibration data corresponding to all maximum points on the vibration curve are arranged according to time sequence to obtain a vibration extremum sequence of each impact test.
It should be noted that the frequency of the vibration sensor for collecting vibration data is 10 hz, and the practitioner can set up by himself according to specific conditions. In this embodiment, a least square method is selected for curve fitting, where the least square method is a technology known to those skilled in the art, and will not be described herein. In other embodiments, the swing angle of the pendulum bob during each impact test can be used as the impact energy corresponding to the impact test, and the absolute value of the vibration data corresponding to the minimum point on the vibration curve can be arranged according to the time sequence to obtain the vibration extremum sequence.
According to the scheme, the impact resistance of the visual base of the vacuum circuit breaker on the column is analyzed, critical information under the impact of the visual base needs to be obtained, so that each test comprises multiple impact tests, and the impact energy of the impact tests is gradually increased from small to large. And carrying out multiple tests on the visual base, wherein the multiple tests have time sequence.
In order to simulate the change of critical information of the visual base under different impact environments, the visual base test is divided into two types, including a normal type and an interference type. The normal test is to perform the next impact test after the vibration generated by each impact test is stopped by the visual base, and the interference test is to perform the next impact test after the vibration generated by each impact test is not stopped by the visual base.
It should be noted that the impact energy of different impact tests in each test is randomly set, but the impact energy of the impact tests in different tests of the same type cannot be completely the same, and the position of the visual base is required to be adjusted after one impact test is completed, so that the pendulum impacts different positions of the visual base in different impact tests, and the damage of the visual base structure is avoided, thereby causing errors in the analysis of subsequent impact tests.
And for each impact test of the normal test, the time length from the moment when the visual base starts to be impacted to the moment when vibration stops is recorded as the vibration time length of the impact test, and the time interval between two adjacent impact tests in each test, namely the time interval between each impact test and the moment when the next impact test starts to be impacted, can be randomly set.
And S2, acquiring vibration characteristic indexes of each impact test, and acquiring impact difference indexes of each impact test according to the similarity of the vibration extremum sequences of each impact test and the previous impact test and the difference of the vibration characteristic indexes.
The object can generate vibration for releasing energy after being impacted, the vibration can convert the impact energy into kinetic energy, and the impact energy is transmitted and dispersed in the object, so that the damage to the structure of the object is reduced. The vibration characteristic index reflects the vibration attenuation characteristics of vibration waves generated by the visual base for impact testing. Wherein the vibration wave is composed of vibration data at all times in the analysis period of the impact test.
Preferably, in some possible implementation manners of the embodiment, the method for acquiring the vibration characteristic index includes acquiring a local vibration value of each vibration data in each vibration extremum sequence according to a time interval between each vibration data in each vibration extremum sequence and a corresponding time of adjacent next vibration data and each vibration data, taking a cumulative sum of local vibration values of other vibration data except the last vibration data in the vibration extremum sequence of each impact test as a comprehensive vibration value of each impact test, and acquiring the vibration characteristic index corresponding to the impact test according to the vibration duration and the comprehensive vibration value of each impact test.
The wave can change shape and period along with the loss of energy in the propagation process, namely the wave can attenuate in the propagation process, and the vibration wave is characterized in that the amplitude of the vibration wave of the impact test is reduced along with the increase of time, and the period of the vibration wave is reduced, namely the time interval between adjacent maximum points is gradually reduced, so as to adapt to the condition of energy reduction. The time interval between each vibration data and the corresponding time of the next adjacent vibration data in the vibration extremum sequence reflects the periodic characteristic of the vibration wave, the vibration data reflects the amplitude of the vibration wave, the larger the local vibration value of the vibration data is, the smaller the vibration attenuation characteristic of the vibration wave at the vibration data position is, and therefore, the time interval between each vibration data and the corresponding time of the next adjacent vibration data is in positive correlation with the local vibration value.
The comprehensive vibration value reflects the overall vibration attenuation condition of the vibration wave of the impact test, the larger the comprehensive vibration value is, the smaller the attenuation degree of the vibration wave is, the vibration duration of the impact test is the attenuation duration required by the impact energy, the longer the attenuation duration is, the smaller the attenuation degree of the vibration wave is, the vibration characteristic index is used for measuring the vibration attenuation characteristic of the impact test, and the larger the vibration characteristic index is, the smaller the attenuation degree of the vibration wave of the impact test is. Therefore, the vibration duration and the comprehensive vibration value of each impact test are in positive correlation with the vibration characteristic index.
In this embodiment, the product of the vibration duration and the integrated vibration value of each impact test is normalized, so as to obtain the vibration characteristic index of the corresponding impact test. In this embodiment, the correlation between the vibration duration and the integrated vibration value and the vibration characteristic index may also be constructed by other basic mathematical operations, which are not limited and described herein.
In a specific implementation of this embodiment, the vibration characteristic index is formulated as:
Wherein, D is the vibration characteristic index of each impact test, T is the vibration time length of each impact test, N is the total number of vibration data in the vibration extremum sequence of each impact test; n-th vibration data except the last vibration data in the vibration extremum sequence for each impact test; the time interval between the corresponding time of the nth vibration data except the last vibration data and the next vibration data in the vibration extremum sequence of each impact test is set; local vibration values of nth vibration data except the last vibration data in the vibration extremum sequence of each impact test; The value of the integrated vibration for each impact test is given, and Norm is a normalization function.
If the impact energy of the impact test is just in the bearing limit of the visual base, the structure of the visual base is damaged to weaken the bearing capacity, and the difference between the vibration damping conditions of the vibration wave of each impact test and the vibration wave of the previous impact test is larger. And analyzing the similarity between each impact test and the vibration extremum sequence of the previous impact test and the difference of the vibration characteristic indexes to obtain an impact difference index, and measuring the critical condition of each impact test.
Preferably, in some possible implementation manners of the embodiment, the method for acquiring the impact difference index includes establishing a two-dimensional coordinate system by taking impact energy as a horizontal axis and taking a vibration characteristic index as a vertical axis, marking all impact tests in each test in the two-dimensional coordinate system to obtain coordinate points, performing curve fitting on the coordinate points in the two-dimensional coordinate system, marking the obtained fitted curve as a vibration characteristic curve of each test, taking the difference between slopes of corresponding points on the vibration characteristic curve of each impact test and the vibration characteristic curve of the test where each impact test is located as a vibration characteristic change rate of each impact test, acquiring a DTW distance between a vibration extremum sequence of each impact test and the vibration extremum sequence of the previous impact test as a local difference index corresponding to two impact tests, and acquiring the impact difference index of each impact test according to the vibration characteristic change rate and the local difference index. The method for calculating the DTW distance in the dynamic time warping algorithm is a well-known technique for those skilled in the art, and will not be described herein.
For the impact test in each test, if the impact energy does not reach the bearing critical of the visual base, the vibration attenuation degree of the vibration wave of the impact test is gradually reduced along with the increase of the impact energy, and if the impact energy exceeds the bearing critical of the visual base, the vibration attenuation degree of the vibration wave is aggravated because the object cannot effectively absorb the energy. Therefore, the vibration characteristic curve of each test shows a trend of increasing and then reducing sharply, and if the difference between the slopes of the corresponding points on the corresponding vibration characteristic curve of each impact test and the previous impact test is larger, namely the change rate of the vibration characteristic is larger, the difference of the vibration attenuation conditions of the vibration waves of the two impact tests is larger, the impact difference index is larger. The difference between the two slopes in this embodiment is the absolute value of the difference between the two slopes.
The local difference index measures the similarity of the vibration attenuation conditions of the vibration waves of the two impact tests, and the larger the local difference index is, the smaller the similarity of the vibration attenuation conditions of the vibration waves of the two impact tests is, the larger the difference of the vibration attenuation conditions of the vibration waves of the two impact tests is. The DTW distance between the two sequences, the euclidean distance, the pearson correlation coefficient, etc. reflect the similarity between the two sequences, and in other embodiments, the DTW distance may be replaced by the euclidean distance or the pearson correlation coefficient, so as to obtain the local difference indicator.
Therefore, the vibration characteristic change rate and the local difference index are in positive correlation with the impact difference index. In this embodiment, the product of the vibration characteristic change rate and the local difference index of each impact test is normalized to obtain the impact difference index of the corresponding impact test. In this embodiment, the correlation between the vibration characteristic change rate and the local difference index and the impact difference index may also be constructed by other basic mathematical operations, which are not limited and described herein.
In this embodiment, the normalization processing is performed using an exponential function based on a natural constant, or other methods may be selected to implement the normalization processing, and the curve fitting is performed using a least square method, which is not limited herein. In this embodiment, the impact difference index of the first impact test in each test is set to zero, and the practitioner can set the impact difference index according to specific situations.
If the impact difference index is larger, the larger the difference between the vibration attenuation characteristics of the vibration wave of each impact test and the vibration wave of the previous impact test is, the more likely the visual base is damaged or is about to be damaged, the more likely the impact energy of the impact test reaches the critical bearing of the visual base, and otherwise, the less likely the impact energy of the impact test reaches the critical bearing.
And step S3, obtaining a comparison impact test of each impact test, and obtaining critical impact energy of each normal test according to the similarity of the vibration extremum sequence of each impact test and the comparison impact test in each normal test and the difference of vibration characteristic indexes and the impact difference index of each impact test.
Because of the diversity of the energy variation bearing the critical force reaching the visual base, in order to improve the accuracy of the critical analysis of the visual base, a control impact test for each impact test is obtained. In this embodiment, each impact test has the same impact energy as its control impact test, the test sequence of the test in which the control impact test is located before the test in which each impact test is located, and the control impact test is in the normal test.
The similarity of the vibration extremum sequences and the differences of the vibration characteristic indexes of each impact test and the control impact test in the normal type test reflect the similarity of the vibration attenuation degree of the vibration wave under the same impact energy, so that the specificity of the vibration wave under the impact energy of each impact test is presented, the impact difference indexes are combined for analysis, and the accuracy of the critical impact energy analysis of the normal type test is improved.
Preferably, in some possible implementation manners of the embodiment, the method for obtaining the first critical likelihood includes taking an impact difference index of each impact test in a first normal type test as the first critical likelihood of the corresponding impact test, obtaining a fluctuation specific index of each impact test according to differences between local difference indexes and vibration characteristic indexes of each impact test and a control impact test for the impact tests in normal type tests except the first normal type test, and obtaining the first critical likelihood of each impact test according to the impact difference index and the fluctuation specific index.
The specific acquisition method of the fluctuation specific index comprises the steps of selecting one impact test from normal tests except a first normal test as a target test, acquiring initial specific indexes of the target test and each comparison impact test according to the difference between the local difference indexes and the vibration characteristic indexes of the target test and each comparison impact test, marking the average value of the initial specific indexes of the target test and all comparison impact tests as comprehensive specific indexes of the target test, acquiring discrete indexes of the initial specific indexes of the target test and all comparison impact tests, and acquiring the fluctuation specific indexes of the target test according to the comprehensive specific indexes and the discrete indexes.
And the target test is respectively compared with the local difference indexes of each control impact test by analyzing the similarity of the vibration extremum sequences, measuring the difference of the vibration attenuation degree of the vibration wave under the same impact energy, and analyzing by combining the difference of the vibration characteristic indexes of the corresponding two impact tests. If the difference between the target test and the local difference index and the vibration characteristic index of each control impact test is larger, the attenuation degree of the vibration waves of the impact test under the same energy is larger, the initial specific index is larger. Therefore, the difference between the local difference index and the vibration characteristic index of the target test and each control impact test is in positive correlation with the initial specific index.
In this embodiment, the product of the target test and the absolute value of the difference between the local difference index and the vibration characteristic index of each control impact test is used as the initial specific index of the target test and each control impact test. In this embodiment, the correlation between the absolute value of the difference between the local difference index and the vibration characteristic index and the initial specific index may also be constructed by other basic mathematical operations, which are not limited and described in detail herein.
The comprehensive specific index reflects the integral difference of vibration attenuation degrees of vibration waves of the target test and all contrast impact tests, the specific degree of the target test is measured, the waveform change of the same impact energy, namely the vibration attenuation degree change, is larger when the comprehensive specific index is larger, the specific of the impact energy of the target test is larger, the discrete index of the initial specific index of the target test and all contrast impact tests is larger, and the reliability of the comprehensive specific index is smaller when the discrete degree of vibration attenuation characteristics of the vibration waves of the same impact energy is larger. Therefore, the comprehensive specific index and the fluctuation specific index are in positive correlation, and the discrete index and the fluctuation specific index are in negative correlation. In this embodiment, the product of the comprehensive specific index and the discrete index of the target test is used as the fluctuation specific index of the target test.
The more the fluctuation specific index is, the more the specific degree of the target test is, namely the larger the change of the vibration attenuation characteristics of the impact test of the same impact energy is, the greater the possibility that the impact energy of the target test reaches the bearing critical of the visual base is.
The variance, standard deviation, range, etc. can reflect the degree of dispersion of the data, and in this embodiment, the variance of the initial specific index of all the control impact tests of the target test is used as the dispersion index, and in other embodiments, the variance may be replaced by the standard deviation or the range.
The larger the impact difference index and the fluctuation specific index are, the larger the possibility that the impact energy of the impact test reaches the bearing critical of the visual base is, and the impact difference index and the fluctuation specific index are in positive correlation with the first critical possibility. In this embodiment, the product of the impact difference index and the fluctuation specific index of each impact test is normalized to obtain the first critical probability of the corresponding impact test. If the first critical probability is larger, the probability that the impact energy of the impact test is the critical impact energy of the normal test is larger, and the critical impact energy is the maximum impact energy which can be born by the visual base before the visual base is damaged.
And judging the first critical probability of the impact test in each normal type test with a preset critical threshold value in sequence according to the order of the impact energy from small to large until the first critical probability is larger than the preset critical threshold value, and stopping judging, wherein the first critical probability when stopping judging corresponds to the impact energy of the impact test and is used as the critical impact energy of each normal type test.
It should be noted that, the preset critical threshold takes an empirical value of 0.78, and the practitioner can set the threshold according to specific situations.
And S4, obtaining critical impact energy of each interference type test according to the difference of vibration time periods of each impact test and the previous impact test and the contrast impact test of the previous impact test in each interference type test and impact difference indexes of each impact test.
The interference test is to perform the next impact test when the vibration generated by each impact test is not stopped, the simulation of the impact condition can cause the accumulation fatigue of the visual base, and the analysis of the critical impact energy of the interference test cannot take the difference of vibration attenuation characteristics of the impact tests of the same impact energy into consideration because the first critical probability can generate a certain specificity in the face of energy accumulation to cause the inaccuracy of the critical impact energy analysis of the interference test, so that the analysis method of the critical impact energy of the interference test needs to be reset.
The vibration duration of the impact test is the attenuation duration required by the impact energy, the time interval between each impact test and the previous impact test in the interference test shows the attenuated part of the impact energy of the previous impact test, the time interval between each impact test and the previous impact test and the vibration duration of the contrast impact test of the previous impact test are different, the part of the impact energy of the previous impact test which is not attenuated is shown, and the analysis is carried out by combining the impact difference index showing the possibility that the impact energy of the impact test reaches the bearing critical of the visual base, so that the accuracy of the critical impact energy analysis of the interference test is improved.
Preferably, in some possible implementation manners of the embodiment, the second critical likelihood acquiring method includes, for impact tests in all interference tests, acquiring an overall comparison vibration duration of each impact test according to a comparison impact test vibration duration of each impact test, taking an absolute value of a difference between a time interval of each impact test and a next impact test and the overall comparison vibration duration of each impact test as an energy accumulation value of each impact test, acquiring a second critical likelihood of each impact test according to an energy accumulation value and an impact difference index of each impact test, wherein the energy accumulation value and the second critical likelihood are in a negative correlation, and the impact difference index and the second critical likelihood are in a positive correlation.
The overall comparison vibration duration reflects the overall level of the vibration duration of the comparison impact test of the impact test, presents the energy attenuation duration required by the impact test under the condition that the impact energy accumulation of the last impact test is not affected, and takes the average value of the vibration durations of all the comparison impact tests of each impact test as the overall comparison vibration duration. The median and mode can reflect the central distribution trend of a group of data, and other embodiments can replace the mean value with the median or mode.
If the absolute value of the difference between the time interval between each impact test and the previous impact test and the whole comparison vibration duration of the previous impact test is smaller, the impact energy of the previous impact test is accumulated to the current impact test, the energy accumulation value is smaller, and the impact difference index of each impact test is more accurate. If the impact difference index is larger, the possibility that the impact energy of the impact test reaches the bearing critical of the visual base is larger. Therefore, the energy accumulation value and the second critical probability are in a negative correlation, and the impact difference index and the second critical probability are in a positive correlation.
In this embodiment, the energy accumulation value of each impact test is mapped in a negative correlation manner, and the product of the mapping result and the impact difference index is normalized to obtain the second critical probability of each impact test. In this embodiment, normalization processing is performed using a Norm function, and an exponential function with a natural constant as a base is selected to perform negative correlation mapping, and other normalization and negative correlation mapping methods may be selected, which is not limited herein. It should be noted that, the accumulated energy value of the first impact test in each interference test is set to zero, and the practitioner can set the accumulated energy value according to the specific situation.
And judging the second critical probability of the impact test in each interference type test with a preset critical threshold value in sequence according to the order of the impact energy from small to large, stopping judging until the second critical probability is larger than the preset critical threshold value, and taking the second critical probability when stopping judging as the critical impact energy of each interference type test, wherein the second critical probability corresponds to the impact energy of the impact test.
And S5, judging the impact resistance quality of the visual base according to the time intervals of the adjacent impact tests in all the tests, the impact energy of each impact test and the critical impact energy.
The time interval of the adjacent impact test shows the accumulated fatigue severity of the visual base, the impact energy of the impact test reflects the impact strength of the visual base under the impact test, the two comprehensively show the impact accumulation condition of the visual base, and the impact resistance is obtained by combining the critical impact energy of each test for analysis, so that the impact resistance quality of the visual base is judged.
Preferably, in some possible implementation manners of the embodiment, the method for acquiring the impact index includes recording, as an analysis test of each test, a critical impact energy of each test corresponding to an impact test before the impact test, acquiring a local accumulated impact degree of each analysis test according to a time interval between each analysis test and a next impact test of each test and the impact energy of each analysis test, taking an accumulated sum of the local accumulated impact degrees of all analysis tests in each test as an integral accumulated impact degree of each test, acquiring a local impact degree of each test according to the integral accumulated impact degree and the critical impact energy of each test, and normalizing an average value of the local impact degrees of all tests to obtain the impact index.
Because the relevant data of the impact test after the visual base is damaged is not credible, and meanwhile, the impact energy during the damage cannot be used as an index for quality monitoring of the visual base, the analysis test of each test is selected in the embodiment, and the analysis test is the impact test of which the visual base is not damaged.
The shorter the time interval between each analysis test and the next impact test in each test, the more serious the accumulated fatigue of the visual base, the larger the impact energy of the analysis test indicates that the stronger the impact strength of the visual base is subjected to the impact test, and the more energy accumulation is possibly caused to the next impact test, so that the time interval and the local accumulated impact degree are in negative correlation, and the impact energy and the local accumulated impact degree are in positive correlation. In this embodiment, the time interval between each analysis test and the next impact test in each test is mapped in a negative correlation manner, and the product of the mapping result and the impact energy of each analysis test is used as the local cumulative impact degree.
The total accumulated impact degree shows the total energy accumulation condition of all analysis tests in each test, the critical impact energy reflects the maximum impact force born by the visual base under the primary impact environment, the larger the critical impact energy is, the less easily damaged the visual base under the primary impact environment is, the larger the critical impact energy is, the better the impact quality of the visual base under the primary impact environment is, and the larger the local impact resistance is. Thus, the overall cumulative impact and the critical impact energy are both positively correlated with the local impact resistance. In this example, the product of the overall cumulative impact per test and the critical impact energy is taken as the local impact per test.
And the acquisition process of the impact resistance index synthesizes and analyzes related data under different impact environments, so that the impact resistance index is more suitable for the complex impact environment, and the accuracy of the impact resistance quality of the visual base is further improved.
When the impact resistance index is larger than the preset qualification threshold, the impact resistance quality of the visual base of the on-column vacuum circuit breaker is qualified, and when the impact resistance index is smaller than or equal to the preset qualification threshold, the impact resistance quality of the visual base of the on-column vacuum circuit breaker is unqualified. It should be noted that, in this embodiment, the preset qualification threshold value takes an empirical value of 0.7, and the practitioner can set the value according to the specific situation.
The present invention has been completed.
Example 2:
the invention provides an impact test system for a novel 10kV column vacuum circuit breaker visual base, referring to FIG. 2, which shows a structural diagram of the impact test system for the novel 10kV column vacuum circuit breaker visual base, wherein the system comprises:
the data acquisition module 610 is used for acquiring a vibration extremum sequence of impact tests of different impact energies in a plurality of tests of a visual base of the vacuum circuit breaker on a column, wherein the test types comprise a normal type and an interference type, and the test sequence of the normal type test is before the interference type test;
The impact difference analysis module 620 is configured to obtain a vibration characteristic index of each impact test, and obtain an impact difference index of each impact test according to a similarity between each impact test and a vibration extremum sequence of a previous impact test and a difference between the vibration extremum sequence and the vibration characteristic index;
the normal critical analysis module 630 is used for obtaining a comparison impact test of each impact test, and obtaining critical impact energy of each normal test according to the similarity of the vibration extremum sequence of each impact test and the comparison impact test in each normal test and the difference of vibration characteristic indexes and the impact difference index of each impact test;
The interference critical analysis module 640 is configured to obtain critical impact energy of each interference type test according to a difference between a time interval between each impact test and a previous impact test in each interference type test and a vibration duration of a control impact test of the previous impact test, and an impact difference index of each impact test;
The impact test module 650 is configured to determine impact resistance quality of the visual base according to time intervals of adjacent impact tests in all tests, impact energy of each impact test, and critical impact energy.
It should be noted that, in the apparatus provided in the foregoing embodiment, only the division of the foregoing functional modules is illustrated, and in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the computer apparatus is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the impact test system for the novel 10kV on-column vacuum circuit breaking visual base and the impact test method for the novel 10kV on-column vacuum circuit breaking visual base provided in the foregoing embodiments belong to the same concept, and detailed implementation processes of the impact test system are shown in the method embodiments, and are not repeated herein.
Example 3:
Fig. 3 is a schematic diagram of a computer device for a novel impact test device for a vacuum circuit breaker on 10kV column visual base according to an embodiment of the invention. As illustrated in fig. 3, the computer device comprises a memory 701, a processor 702 and a computer program 703 stored in the memory 701 and running on the processor 702, wherein the processor 702, when executing the computer program 703, causes the computer device to perform any of the above-described impact test methods for a novel 10kV on-column vacuum circuit breaker vision mount.
In addition, the embodiment of the application also protects a device, which can comprise a memory and a processor, wherein executable program codes are stored in the memory, and the processor is used for calling and executing the executable program codes to execute the impact test method for the novel 10kV column vacuum circuit breaker visual base.
In this embodiment, the functional modules of the apparatus may be divided according to the above method example, for example, each functional module may be corresponding to one processing module, or two or more functions may be integrated into one processing module, where the integrated modules may be implemented in a hardware form. It should be noted that, in this embodiment, the division of the modules is schematic, only one logic function is divided, and another division manner may be implemented in actual implementation.
It should be understood that the apparatus provided in this embodiment is used to perform the impact test method for the novel on-10 kV column vacuum circuit breaker visual base, so that the same effects as those of the implementation method can be achieved.
In case of an integrated unit, the apparatus may comprise a processing module, a memory module. When the device is applied to equipment, the processing module can be used for controlling and managing the actions of the equipment. The memory module may be used to support devices executing inter-program code, etc.
Wherein the processing module may be a processor or controller that may implement or execute the various exemplary logic blocks, modules and circuits contained in connection with the present disclosure. A processor may also be a combination of computing functions, including for example one or more microprocessors, digital Signal Processing (DSP) and microprocessor combinations, etc., and a memory module may be a memory.
It should be noted that the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, any modifications, equivalents, improvements, etc. that fall within the principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An impact test method for a novel 10kV column vacuum circuit breaker visual base, which is characterized by comprising the following steps:
Obtaining a vibration extremum sequence of impact tests of different impact energies of a visual base of the vacuum circuit breaker on a column in a plurality of tests, wherein the types of the tests comprise a normal type and an interference type, and the test sequence of the normal type test is before the interference type test;
obtaining the impact difference index of each impact test according to the similarity of the vibration extremum sequence of each impact test and the previous impact test and the difference of the vibration characteristic index;
Obtaining critical impact energy of each normal test according to the similarity between each impact test and the vibration extremum sequence of the control impact test and the difference of the vibration characteristic index in each normal test and the impact difference index of each impact test;
Obtaining critical impact energy of each interference type test according to the difference between the time interval between each impact test and the previous impact test and the vibration duration of the control impact test of the previous impact test in each interference type test and the impact difference index of each impact test;
judging the impact resistance quality of the visual base according to the time intervals of adjacent impact tests in all tests, the impact energy of each impact test and the critical impact energy;
The obtaining the vibration characteristic index of each impact test comprises the following steps:
the vibration data in the vibration extremum sequence has corresponding time;
obtaining a local vibration value of each vibration data in each vibration extremum sequence according to the time interval between each vibration data in each vibration extremum sequence and the corresponding moment of the next adjacent vibration data and each vibration data;
taking the accumulated sum of the local vibration values of the rest vibration data except the last vibration data in the vibration extremum sequence of each impact test as the comprehensive vibration value of each impact test;
according to the vibration duration of each impact test and the comprehensive vibration value, obtaining a vibration characteristic index of the corresponding impact test;
the obtaining the impact difference index of each impact test comprises the following steps:
Marking all impact tests in each test in the two-dimensional coordinate system to obtain coordinate points, performing curve fitting on the coordinate points in the two-dimensional coordinate system, and recording the obtained fitting curve as a vibration characteristic curve of each test;
Taking the difference between the slope of the corresponding point of each impact test and the vibration characteristic curve of the previous impact test in the test where each impact test is located as the vibration characteristic change rate of each impact test;
Acquiring the DTW distance between each impact test and the vibration extremum sequence of the previous impact test, and recording the DTW distance as a local difference index corresponding to the two impact tests;
and obtaining the impact difference index of each impact test according to the vibration characteristic change rate and the local difference index.
2. The impact test method for the novel 10kV column vacuum circuit breaker visual base according to claim 1, wherein the obtaining of critical impact energy of each normal test comprises the following steps:
Taking the impact difference index of each impact test in the first normal test as a first critical possibility of the corresponding impact test;
For impact tests in normal tests except for a first normal test, acquiring a fluctuation specific index of each impact test according to the difference between the local difference index and the vibration characteristic index of each impact test and the control impact test;
and acquiring critical impact energy of each test according to the first critical possibility of all impact tests in each normal test.
3. The impact test method for the novel 10kV column vacuum circuit breaker visual base according to claim 2, wherein the step of obtaining critical impact energy of each interference test comprises the following steps:
For impact tests in all interference tests, acquiring the integral comparison vibration duration of each impact test according to the vibration duration of the comparison impact test of each impact test;
Taking the absolute value of the difference between the time interval between each impact test and the previous impact test and the integral comparison vibration duration of the previous impact test as an energy accumulation value of each impact test;
Acquiring a second critical probability of each impact test according to the energy accumulation value and the impact difference index of each impact test, wherein the energy accumulation value and the second critical probability are in a negative correlation, and the impact difference index and the second critical probability are in a positive correlation;
and acquiring critical impact energy of each test according to the second critical possibility of all impact tests in each interference type test.
4. A method for impact testing of a novel 10kV column vacuum circuit breaker vision base according to claim 3, wherein the obtaining critical impact energy for each test comprises:
recording the first critical probability and the second critical probability as analysis critical probability;
And judging the analysis critical probability of the impact test in each test with a preset critical threshold value in sequence according to the order of the impact energy from small to large until the analysis critical probability is larger than the preset critical threshold value, and stopping judging, wherein the analysis critical probability in the stopping judging corresponds to the impact energy of the impact test and is used as the critical impact energy of each test.
5. The impact test method for a novel 10kV on-column vacuum circuit breaker visual base according to claim 1, wherein the determining the impact quality of the visual base according to the time interval between adjacent impact tests in all tests and the impact energy of each impact test, and the critical impact energy comprises:
For each test impact test, recording the critical impact energy of each test corresponding to the impact test before the impact test as the analysis test of each test;
Obtaining the local accumulated impact degree of each analysis test according to the time interval between each analysis test and the next impact test and the impact energy of each analysis test in each test;
According to the integral accumulated impact degree and critical impact energy of each test, obtaining the local impact degree of each test;
and judging the impact resistance quality of the visual base according to the impact resistance index.
6. The impact test method for the novel 10kV column vacuum circuit breaker visual base according to claim 5, wherein the judging the impact resistance quality of the visual base according to the impact resistance index comprises the following steps:
And when the impact resistance index is smaller than or equal to the preset qualification threshold, the impact resistance quality of the visual base of the on-column vacuum circuit breaker is not qualified.
7. The impact test method for the novel 10kV column vacuum circuit breaker visual base according to claim 1, wherein the impact energy of each impact test is equal to that of a comparison impact test, the test sequence of the test where the comparison impact test is located before the test where each impact test is located, and the comparison impact test is in a normal test.
8. The impact test method for a novel 10kV on-column vacuum circuit breaker visual base according to claim 2, wherein the obtaining the fluctuation specific index of each impact test according to the difference between the local difference index and the vibration characteristic index of each impact test and the control impact test comprises:
Selecting one impact test from normal tests except the first normal test as a target test, and acquiring initial specific indexes of the target test and each comparison impact test according to the difference between the target test and the local difference index and the vibration characteristic index of each comparison impact test;
The average value of the initial specific indexes of the target test and all the control impact tests is recorded as the comprehensive specific index of the target test;
and acquiring the fluctuation specific index of the target test according to the comprehensive specific index and the discrete index.
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