CN106199243A - A kind of optimization group technology of multifrequency electromagnetic susceptibility test - Google Patents

Abstract

The present invention relates to the optimization group technology of a kind of multifrequency electromagnetic susceptibility test, step 1, acquisition test information；Calculating the test frequency of test specimen, the sum of test specimen test frequency is A；User provides number B of the sensitive frequency of test specimen maximum that may be present；Step 2, acquisition packet parameters；Provide the packet situation of optimum, the packet number of times i.e. testedThe group number of packet is eB every time；Step 3, carry out packet test；All frequency averagings to be measured are divided into eB group, each group is carried out sensitivity test, after test terminates, remove and do not show the frequency that the packet of sensitivity phenomenon comprises；Step 4, repeatSecondary step 3；Step 5, complete packet test after to packet test remaining frequency carry out successive test, it is judged that whether they are sensitive frequency.The present invention reduces the scope of test frequency number, and the efficiency making packet test gets a greater increase.

Description

A kind of optimization group technology of multifrequency electromagnetic susceptibility test

Technical field

The present invention relates to the optimization group technology of a kind of multifrequency electromagnetic susceptibility test, belong to sensitivity measuring technology neck Territory.

Background technology

Electromagnetic compatibility is as in electronic product very prominent key element, and it requires that equipment has and meets respective standard Electromagnetic susceptibility and Electromagnetic Launching ability.For investigating the electromagnetic susceptibility of equipment, the GJB 151B-2013 examination to electromagnetic susceptibility Test requirement and measurement provides regulation.Test specimen is carried out step-by-step movement scanning time, equipment need on each tuned frequency at least The response time (taking big person) of resident 3s or test specimen.When testing frequency and being a lot, test exists for time-consuming long problem.

The existing conducted susceptibility multifrequency test system that BJ University of Aeronautics & Astronautics proposes, is first to treat measured frequency to carry out Packet test, the frequency then comprised the packet showing sensitivity phenomenon in packet test is tested one by one.Due to quick Sensitivity test time-consumingly becomes positive correlation with the number of times tested, and multifrequency packet test reduces the number of times of test, but this test system is entered During the test of row multifrequency, due to the limit value of signal source output, often in group, the selection of frequency is ensureing general power equilibrium assignment On the basis of, make often to organize build-in test frequency and count the most, although improve than GJB 151B-2013 testing efficiency, but Overall test efficiency still cannot meet actual demand, and therefore testing efficiency there is a need to improve.On this basis, the present invention meets the tendency And give birth to.

Summary of the invention

The technology of the present invention solves problem: overcome the deficiencies in the prior art, it is provided that it is excellent that a kind of multifrequency electromagnetic susceptibility is tested Change group technology, start with from the angle of grouping efficiency, it is assumed that be linear system by test system, and the output of signal source is not subject to In the case of limit, by analyzing the relation between number and the possible sensitive frequency number of test frequency, arrange in packet Excellent test frequency number, and after often taking turns packet test, remove the packet not showing sensitivity phenomenon, reduce test frequency The scope of number, the efficiency making packet test gets a greater increase.

The technology of the present invention solution: the optimization group technology of a kind of multifrequency electromagnetic susceptibility test, step is as follows:

Step one, acquisition test information.According to the characteristic of test specimen, determine the test frequency range of test specimen, and by GJB In 151B-2013 (MIL-STD-461G), the stepping to electromagnetic susceptibility test requires to calculate the test frequency of test specimen, quilt The sum of test product test frequency is A.User tests experience according to the sensitivity before test specimen or like product, provides test specimen Number B of the sensitive frequency of maximum that may be present.

Step 2, acquisition packet parameters.The frequency information be given according to step one, provides the packet situation of optimum: test Packet number of timesThe group number of packet is eB every time.

Step 3, carry out packet test.All frequency averagings to be measured are divided into eB group, each group is carried out sensitivity survey Examination, after test terminates, removes and does not shows the frequency that the packet of sensitivity phenomenon comprises.

Step 4, repeatSecondary step 3.(Secondary round).

Step 5, said process complete packet test, then packet are tested remaining frequency and carry out successive test, it is judged that Whether they are sensitive frequency.

Hereinafter above-mentioned packet parameters is illustrated:

Assuming that the test total number of frequencies that a certain sensitivity is tested is A, providing this test specimen according to conventional test experience can The maximum sensitive frequency number of energy is B, and A, B are positive integer.(k is for just to complete that the test of this test specimen sensitivity needs carry out k Integer) wheel packet test；And requiring the packet count often taken turns more than possible maximum sensitive frequency number, so total existence does not contains There is not sensitivity phenomenon in the packet of sensitive frequency, i.e. this group, it is possible to the frequency this group comprised is removed, and reach to reduce test frequency The purpose of rate number, again owing to packet count is less than full test frequency points, often takes turns the group number of test be followed successively by m so setting₁B、 m₂B、…、m_kB(m₁、m₂、…、m_kCoefficient for more than 1).Grouping process considers least preferably situation, in the most each group only One sensitive frequency, now the present invention is grouped the minimum efficiency that efficiency is raising that method of testing is improved.Owing to being grouped Cheng Zhong, repeatedly carries out divide operations to A, for ease of calculate, it is assumed that A value meet it is made division arithmetic after remainder be zero.Point Group process is as shown in table 1:

Table 1 Group testing model

According to table 1, will filter out all sensitive frequency, the number of times y carrying out testing comprises two parts, is respectively packet The number of times m of test₁B、m₂B、…、m_kB, and the number of times tested one by oneSo obtaining total testing time:

$y=m_{1}B+m_{2}B+...+m_{k}B+\frac{A}{m_1{m}_2...m_k}---\left(1\right)$

Owing to the purpose of optimal group method is to ensure that total testing time is minimum, so m should be solved₁、m₂、…、m_kFor many Time few, y can get and be worth most.Make y respectively to m₁、m₂、…、m_kAsk single order to lead, second order is led, and to make first derivative be zero, with y to m₁ As a example by derivation,For y to m₁First derivative,For y to m₁Second dervative:

$y_{m_1}^{\′}=B-\frac{A}{m_1^2{m}_2...m_k}=0---\left(2\right)$

$y_{m_1}^{\′\′}=\frac{2A}{m_1{m}_2{m}_4...m_k}{m}_1^{-3}>0---\left(3\right)$

Solve:

$m_1=\sqrt{\frac{A}{{\mathrm{Bm}}_1{m}_2\mathrm{...}{m}_k}}---\left(4\right)$

$y_{m_1}^{\′\′}>0---\left(5\right)$

In like manner have:

$m_2=m_3=...=m_k=\sqrt{\frac{A}{{\mathrm{Bm}}_1{m}_2\mathrm{...}{m}_k}}---\left(6\right)$

$y_{m_2}^{\′\′}>0,y_{m_3}^{\′\′}>0,...,y_{m_k}^{\′\′}>0---\left(7\right)$

It is respectively y to m₂、m₃、m_kSecond dervative.So, the group number of each wheel packet is one to be fixed During constant, it is set to m₁=m₂...=m_k=m, can make total testing time get most and be worth, and owing to the second dervative of m is more than by y Zero, so now y obtains minima.Then, the grouping process of table 1 can be converted to shown in table 2:

Table 2 Group testing model

Now, completing sensitivity test number of times to be detected is:

$y=kmB+\frac{A}{m^k}---\left(8\right)$

On the basis of discussed above, when why discussion k, m are worth so that y is minimum.Y is respectively to k, m derivation, and makes derivative It is zero:

y′_m=kB-Akm^-k-1=0 (9)

y′_k=mB-Am^-kLnm=0 (10)

y′_m、y′_kIt is respectively the y first derivative to m, k, solves: m=e,The group number the most often taking turns packet is Constant eB.Y about the second order of k, m lead into:

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″_mmFor the y second dervative to m, y "_kkFor the y second dervative to k, y "_mkFor y, m first asked first derivative, then to k Seek second dervative, by m=e,Substitute into above-mentioned formula, obtain:

y″_kk=eB (14)

$y_{mm}^{\′\′}=\frac{B}{e}ln\frac{A}{B}(ln\frac{A}{B}-1)---\left(15\right)$

$y_{km}^{\′\′}=B(ln\frac{A}{B}-1)---\left(16\right)$

Due to

${y_{km}^{\′\′}}^2-y_{mm}^{\′\′}{y}_{kk}^{\′\′}=B^2(1-ln\frac{A}{B})---\left(17\right)$

And

y″_kk=eB > 0 (18)

So working asTime, y "_km ²-y″_mmy″_kk< 0, nowMinima for y.So, M=e,For optimum group technology, carry out the most altogetherWheel packet, often wheel packet group number be eB, e be oneself So constant, approximates 2.71828, and embodiment of the present invention takes 2.70 or 2.71.

Present invention advantage compared with prior art is: compared with the test of present invention sensitivity existing with Beijing Institute of Aeronautics, Beijing Institute of Aeronautics The test of existing multifrequency is started with from the angle of power limited, and often in group, the selection of frequency considers power high level matches with low level, total in guarantee On the basis of power equalization distribution, making often to organize build-in test frequency and count the most, testing efficiency is restricted；The present invention is then Beijing Institute of Aeronautics conducted susceptibility test system is started with from optimal group method (the most efficient group technology), it is contemplated that often organize optimum Test frequency number, and after packet test every time, reduce the sum of test frequency, reduce test scope, make the effect that packet is tested Rate gets a greater increase.

Accompanying drawing explanation

Fig. 1 is the optimization group technology test flow chart of multifrequency electromagnetic susceptibility of the present invention test.

Detailed description of the invention

Below in conjunction with accompanying drawing and example, the present invention is described in further detail.

As it is shown in figure 1, the present invention proposes the optimal stage size method of multifrequency electromagnetic susceptibility test, walk including lower column processing Rapid:

Step one, acquisition test information.According to the working band of test specimen, determine the test frequency range scope of test specimen, and Required to calculate the test frequency of test specimen by the stepping in GJB151B-2013, electromagnetic susceptibility tested, as test specimen is tested The sum of frequency is A=10000.Experience is tested, as normal in test in the past according to the sensitivity before test specimen or like product The sensitive frequency seen and the quantity of sensitive frequency, the number of the sensitive frequency providing test specimen maximum that may be present is B= 100。

Step 2, acquisition packet parameters.The frequency information be given according to step one, and determine optimum by above-mentioned analysis Group technology:EB=270, carries out 3 packets the most altogether, and the group number of packet is about 270 every time.

Step 3, carry out packet test.All frequency averagings to be measured are divided into 270 groups, each group is carried out sensitivity survey Examination, after test terminates, removes and does not shows the frequency that the packet of sensitivity phenomenon comprises.

Step 4, to repeat 3 step 3 (the most rightRound).

Step 3, four illustrate by following table.During calculating, there may be remainder, here result of calculation is done suitably Process, owing to the remainder in solution procedure is smaller, the least compared with test frequency number 10000, do not consider.E takes Value makes the residual frequency number that this total number of frequencies being grouped was grouped close to last time as far as possible, so first and third packet e takes 2.70, Second time packet e takes 2.71.

Step 5, said process complete packet test, below packet are tested remaining frequency and carry out successive test, it is judged that Whether they are sensitive frequency.

According to above-mentioned testing procedure, when total test frequency number be A be 10000, possible maximum sensitive frequency number B is When 100, need to carry outWheel packet test, packet count eB often taken turns is about 270, and packet testing time is 270+271+270=811 time, test to carry out 466 tests one by one, and the optimization group technology of multifrequency electromagnetic susceptibility test is altogether Needing to carry out 811+466=1277 test, compared with detecting one by one and carrying out 10000 tests, efficiency improves 87%.

Claims (2)

1. the optimization group technology of a multifrequency electromagnetic susceptibility test, it is characterised in that comprise the following steps that

Step one, acquisition test information；Calculating the test frequency of test specimen, the sum of test specimen test frequency is A；Be given by Number B of the sensitive frequency of test product maximum that may be present；

Step 2, acquisition packet parameters；The sum of the test specimen test frequency be given according to step one is A and test specimen may be deposited Number B of maximum sensitive frequency, provide the packet situation of optimum, the packet number of times i.e. testedPacket every time Group number be eB, e be natural constant；

Step 3, carry out packet test；All frequency averagings to be measured are divided into eB group, each group is carried out sensitivity test, survey After examination terminates, remove and do not show the frequency that the packet of sensitivity phenomenon comprises；

Step 4, repeatSecondary step 3；

Step 5, complete packet test after remaining frequency tested in packet carry out successive test, it is judged that whether they are sensitive Frequency.

The optimization group technology of a kind of multifrequency electromagnetic susceptibility the most according to claim 1 test, it is characterised in that: described In step one, test experience according to the sensitivity before test specimen or like product, provide test specimen maximum that may be present Number B of sensitive frequency.