CN106199243B - A kind of optimization group technology of multifrequency electromagnetic susceptibility test - Google Patents
A kind of optimization group technology of multifrequency electromagnetic susceptibility test Download PDFInfo
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- CN106199243B CN106199243B CN201610479674.3A CN201610479674A CN106199243B CN 106199243 B CN106199243 B CN 106199243B CN 201610479674 A CN201610479674 A CN 201610479674A CN 106199243 B CN106199243 B CN 106199243B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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Abstract
The present invention relates to a kind of optimization group technology of multifrequency electromagnetic susceptibility test, step 1 obtains test information；The test frequency of test item is calculated, the sum of test item test frequency is A；User provides the number B of test item maximum sensitive frequency that may be present；Step 2 obtains packet parameters；Optimal grouping situation is provided, that is, the grouping number testedThe group number being grouped every time is eB；Step 3 is grouped test；All frequency averagings to be measured are divided into eB group, to each group of carry out susceptibility test, after test, removal does not show the frequency that the grouping of sensitivity phenomenon includes；Step 4 repeatsSecondary step 3；Step 5 carries out successive test to the remaining frequency of grouping test after completing grouping test, judges whether they are sensitive frequency.The present invention reduces the range of test frequency number, and the efficiency for testing grouping gets a greater increase.
Description
Technical field
The present invention relates to a kind of optimization group technologies of multifrequency electromagnetic susceptibility test, belong to susceptibility test technology neck
Domain.
Background technique
As one in electronic product element very outstanding, it requires equipment to have to meet respective standard electromagnetic compatibility
Electromagnetic susceptibility and Electromagnetic Launching ability.For the electromagnetic susceptibility for investigating equipment, examination of the GJB 151B-2013 to electromagnetic susceptibility
It tests requirement and measurement provides regulation.When carrying out step-by-step movement scanning to test item, equipment needs on each tuned frequency at least
The response time (taking big person) of resident 3s or test item.When there are many test frequency, test there is the problem of time-consuming.
The existing conducted susceptibility multifrequency test macro that BJ University of Aeronautics & Astronautics proposes is first to treat measured frequency progress
Grouping test, the frequency for then being included to the grouping for showing sensitivity phenomenon in grouping test are tested one by one.Due to quick
Sensitivity test time-consuming and the number of test are positively correlated, and multifrequency grouping test reduces the number of test, but the test macro into
When row multifrequency is tested, due to the limit value of signal source output power, the selection of frequency is guaranteeing general power equilibrium assignment in every group
On the basis of, keep test frequency points in every group as more as possible, although being improved than GJB 151B-2013 testing efficiency,
Overall test efficiency is still unable to satisfy actual demand, therefore testing efficiency raising in need.On this basis, the present invention is met the tendency of
And it gives birth to.
Summary of the invention
The technology of the present invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of the excellent of multifrequency electromagnetic susceptibility test
Change group technology, start with from the angle of grouping efficiency, it is assumed that by test system be linear system, and the output power of signal source not by
In the case where limit, by the relationship between the number and possible sensitive frequency number of analysis test frequency, it is arranged in grouping most
Excellent test frequency number, and the grouping for not showing sensitivity phenomenon is removed after every wheel grouping test, reduce test frequency
Several ranges, the efficiency for testing grouping get a greater increase.
The technology of the present invention solution: a kind of optimization group technology of multifrequency electromagnetic susceptibility test, steps are as follows:
Step 1: obtaining test information.According to the characteristic of test item, the test frequency range of test item is determined, and by GJB
The test frequency of test item, quilt are calculated in 151B-2013 (MIL-STD-461G) to the stepping requirement of electromagnetic susceptibility test
The sum of test product test frequency is A.User provides test item according to the susceptibility test experience before test item or similar product
The number B of maximum sensitive frequency that may be present.
Step 2: obtaining packet parameters.The frequency information provided according to step 1 provides optimal grouping situation: test
Grouping numberThe group number being grouped every time is eB.
Step 3: being grouped test.All frequency averagings to be measured are divided into eB group, to each group of carry out susceptibility survey
Examination, after test, removal does not show the frequency that the grouping of sensitivity phenomenon includes.
Step 4: repeatingSecondary step 3.(Secondary rounding).
Step 5: the above process completes grouping test, remaining frequency then is tested to grouping and carries out successive test, judgement
Whether they are sensitive frequency.
Above-mentioned packet parameters are illustrated below:
Assuming that the test frequency sum of a certain susceptibility test is A, providing the test item according to previous test experience can
The maximum sensitive frequency number of energy is B, and A, B are positive integer.Completion needs to carry out k to the test item susceptibility test, and (k is positive
Integer) wheel grouping test；And the packet count of every wheel is required to be greater than possible maximum sensitive frequency number, there is always do not contain in this way
The grouping of sensitive frequency, the i.e. group do not occur sensitivity phenomenon, so that it may which the frequency for including by the group removes, and reaches diminution test frequency
The purpose of rate number, and since packet count is less than full test frequency points, so the group number for setting every wheel test is followed successively by m1B、
m2B、…、mkB(m1、m2、…、mkFor the coefficient greater than 1).Grouping process considers least ideal situation, i.e., only has in each group
One sensitive frequency, the efficiency that present invention grouping test method is improved at this time is the minimum efficiency improved.Due to being grouped
Cheng Zhong repeatedly carries out divide operations to A, for convenient for calculating, it is assumed that remainder is zero after A value satisfaction makees division arithmetic to it.Point
Group process is as shown in table 1:
1 Group testing model of table
According to table 1, all sensitive frequencies are filtered out, the number y tested includes two parts, is respectively grouped
The number m of test1B、m2B、…、mkB, and the number tested one by oneSo obtaining total testing time:
Since the purpose of optimal group method is to guarantee that total testing time is minimum, so m should be solved1、m2、…、mkIt is more
When few, y, which can be got, to be most worth.Enable y respectively to m1、m2、…、mkAsk single order to lead, second order is led, and enabling first derivative is zero, with y to m1
For derivation,It is y to m1First derivative,It is y to m1Second dervative:
It solves:
Similarly have:
Respectively y is to m2、m3、mkSecond dervative.So the group number of each wheel grouping is one solid
When permanent several, it is set as m1=m2...=mk=m can be such that total testing time gets and most be worth, and since second dervative of the y to m is big
In zero, so y obtains minimum value at this time.Then, the grouping process of table 1 can be converted to shown in table 2:
2 Group testing model of table
At this point, completing the susceptibility test number to be detected are as follows:
On the basis of discussed above, when discussing why k, m are worth, so that y is minimum.Y enables derivative respectively to k, m derivation
It is zero:
y′m=kB-Akm-k-1=0 (9)
y′k=mB-Am-kLnm=0 (10)
y′m、y′kRespectively y solves the first derivative of m, k: m=e,I.e. it is every wheel grouping group number be
Constant eB.Y is led about the second order of k, m are as follows:
y″mm=A (k+1) km-k-2 (11)
y″mk=Am-k(lnm)2 (12)
y″mk=B+Akm-k-1lnm-Am-k-1 (13)
y″mmIt is y to the second dervative of m, y "kkIt is y to the second dervative of k, y "mkFirst derivative is first asked to m for y, then to k
Second dervative is sought, by m=e,Above-mentioned formula is substituted into, is obtained:
y″kk=eB (14)
Due to
And
y″kk=eB > 0 (18)
So working asWhen, y "km 2-y″mmy″kk< 0, at this timeFor the minimum value of y.So
M=e,For optimal group technology, i.e., carry out altogetherWheel grouping, every wheel grouping group number are eB, and e is certainly
Right constant is approximately equal to 2.71828, and embodiment of the present invention takes 2.70 or 2.71.
The advantages of the present invention over the prior art are that: the present invention is compared with the existing susceptibility test of Beijing Institute of Aeronautics, Beijing Institute of Aeronautics
Existing multifrequency test is started with from the angle of power limited, and the selection of frequency considers power high level matches with low level in every group, is being guaranteed always
On the basis of power equalization distribution, make in every group test frequency points as more as possible, testing efficiency is restricted；The present invention is then
Start in Beijing Institute of Aeronautics conducted susceptibility test macro from optimal group method (most efficient group technology), it is contemplated that every group optimal
Test frequency number, and the sum of test frequency is reduced after each grouping test, test scope is reduced, the effect for testing grouping
Rate gets a greater increase.
Detailed description of the invention
Fig. 1 is the optimization group technology test flow chart of multifrequency electromagnetic susceptibility test of the present invention.
Specific embodiment
Below in conjunction with attached drawing and example, the present invention is described in further detail.
As shown in Figure 1, the present invention proposes the optimal stage size method of multifrequency electromagnetic susceptibility test, including lower column processing step
It is rapid:
Step 1: obtaining test information.According to the working band of test item, the test frequency range range of test item is determined, and
By calculating the test frequency of test item in GJB151B-2013 to the stepping requirement of electromagnetic susceptibility test, as test item is tested
The sum of frequency is A=10000.According to the susceptibility test experience before test item or similar product, in such as previous test often
The quantity of the sensitive frequency and sensitive frequency seen, the number for providing test item maximum sensitive frequency that may be present is B=
100。
Step 2: obtaining packet parameters.The frequency information provided according to step 1, and determined by above-mentioned analysis optimal
Group technology:EB=270 carries out 3 groupings altogether, the group number being grouped every time is about 270.
Step 3: being grouped test.All frequency averagings to be measured are divided into 270 groups, to each group of carry out susceptibility survey
Examination, after test, removal does not show the frequency that the grouping of sensitivity phenomenon includes.
Step 4: it is (right herein to repeat 3 step 3It is rounded).
Step 3: four are illustrated with following table.It there may be remainder in calculating process, calculated result done suitably here
Processing, since the remainder in solution procedure is all smaller, the very little compared with test frequency number 10000 is not considered.E's takes
The residual frequency number that the total number of frequencies that value is as far as possible grouped this was grouped close to last time, so first and third grouping e takes 2.70,
Second of grouping e takes 2.71.
Step 5: the above process completes grouping test, remaining frequency is tested to grouping below and carries out successive test, judgement
Whether they are sensitive frequency.
It is 10000 when total test frequency number is A according to above-mentioned testing procedure, possible maximum sensitive frequency number B is
When 100, need to carry outWheel grouping test, the packet count eB of every wheel is about 270, and grouping testing time is
270+271+270=811 times, test will carry out 466 tests one by one, and the optimization group technology of multifrequency electromagnetic susceptibility test is total
Need to carry out 811+466=1277 test, compared with detection one by one carries out 10000 tests, efficiency improves 87%.
Claims (2)
1. a kind of optimization group technology of multifrequency electromagnetic susceptibility test, it is characterised in that comprise the following steps that
Step 1: obtaining test information；The test frequency of test item is calculated, the sum of test item test frequency is A；Provide by
The number B of test product maximum sensitive frequency that may be present；
Step 2: obtaining packet parameters；The sum of the test item test frequency provided according to step 1 is that A and test item may be deposited
Maximum sensitive frequency number B, provide optimal grouping situation, that is, the grouping number testedGrouping every time
Group number be eB, e is natural constant；It is grouped numberIt is rounded；
Step 3: being grouped test；All frequency averagings to be measured are divided into eB group, to each group of carry out susceptibility test, are surveyed
After examination, removal does not show the frequency that the grouping of sensitivity phenomenon includes；
Step 4: repeatingSecondary step 3；
Step 5: testing remaining frequency to grouping after completing grouping test carries out successive test, judge whether they are sensitive
Frequency.
2. a kind of optimization group technology of multifrequency electromagnetic susceptibility test according to claim 1, it is characterised in that: described
In step 1, according to the susceptibility test experience before test item or similar product, it is that may be present maximum to provide test item
The number B of sensitive frequency.
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| CN107121602B (en) * | 2017-03-21 | 2020-03-03 | 广州小鹏汽车科技有限公司 | Interference source searching method for vehicle-mounted central control system |
| CN114355089B (en) * | 2022-01-10 | 2022-09-23 | 北京航空航天大学 | Electromagnetic environment effect boundary testing method for electronic system |
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| CN102749536A (en) * | 2012-06-08 | 2012-10-24 | 北京航空航天大学 | Optimization method for conducted interference fault correcting by using conduction test standard-exceeding strategy |
| CN103048569A (en) * | 2012-12-24 | 2013-04-17 | 北京航空航天大学 | Optimization method for electromagnetic compatibility fault repair by adopting electromagnetic compatibility test over-standard strategy |
| CN103826136A (en) * | 2014-02-19 | 2014-05-28 | 华为软件技术有限公司 | Rapid inverse discrete cosine transform method and terminal |
| CN103823135A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Method for adjusting frequency point range in multifrequency quick sensitivity test |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749536A (en) * | 2012-06-08 | 2012-10-24 | 北京航空航天大学 | Optimization method for conducted interference fault correcting by using conduction test standard-exceeding strategy |
| CN103048569A (en) * | 2012-12-24 | 2013-04-17 | 北京航空航天大学 | Optimization method for electromagnetic compatibility fault repair by adopting electromagnetic compatibility test over-standard strategy |
| CN103826136A (en) * | 2014-02-19 | 2014-05-28 | 华为软件技术有限公司 | Rapid inverse discrete cosine transform method and terminal |
| CN103823135A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Method for adjusting frequency point range in multifrequency quick sensitivity test |
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