CN109815581B - Evaluation method of airplane power supply characteristic test analysis algorithm software - Google Patents
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Abstract
The invention relates to a test technology of airplane power supply characteristics, and aims to fundamentally solve the problem of inconsistent test and analysis results caused by data processing algorithm differences of airplane power supply characteristic parameter digital test systems. The invention provides an evaluation method of airplane power supply characteristic test analysis algorithm software, which comprises the following steps: step one, generating a data function reflecting power supply characteristics according to analysis requirements of airplane power supply characteristic parameters to be analyzed and tested; inputting the data function generated in the first step into digital test equipment to be tested to obtain a test analysis result; inputting the data function generated in the step one into standard software of a data processing method according to the power supply characteristic requirements of the national military standard aircraft, and obtaining a test result after analysis and test; and step four, comparing and comparing the test results obtained in the step two and the step three to obtain a judgment result.
Description
Technical Field
The invention belongs to the technical field of airplane power supply characteristic testing, and relates to an evaluation method of airplane power supply characteristic testing analysis algorithm software.
Background
Because the method for defining, testing and analyzing the characteristic parameters of the aircraft power supply system, such as the parameters of alternating voltage, voltage phase difference, distortion frequency spectrum and the like, is greatly different from the characteristic parameters of the ground power system, for example, the alternating voltage is defined as a half-wave effective value in a basic period as the definition of the alternating voltage, the main frequency of the aircraft power system is 360-800Hz, and the ground is only 50-60Hz, when the alternating voltage has a direct current component, the difference occurs, and the result of the voltage effective value has great deviation. Therefore, when a plurality of digital testing devices for the characteristic parameters of the ground power system are applied to the aviation background, disputes and inconsistency of the testing results can be generated, and the development progress of the airplane is seriously influenced. For the aircraft power supply characteristic testing technology, how to evaluate the software processing algorithm of the digital power supply characteristic testing equipment is an important basic task.
Disclosure of Invention
The invention aims to fundamentally solve the problem of inconsistent test analysis results caused by the difference of data processing algorithms of a digital test system for the power supply characteristic parameters of an airplane.
In order to achieve the purpose, the invention provides an evaluation method of aircraft power supply characteristic test analysis algorithm software, which comprises the following steps:
step one, generating a data function reflecting power supply characteristics according to analysis requirements of airplane power supply characteristic parameters to be analyzed and tested;
inputting the data function generated in the first step into digital test equipment to be tested to obtain a test analysis result;
inputting the data function generated in the step one into standard software of a data processing method according to the power supply characteristic requirements of the national military standard aircraft, and obtaining a test result after analysis and test;
and step four, comparing and comparing the test results obtained in the step two and the step three to obtain a judgment result.
Specifically, the aircraft power supply characteristic parameters in the first step include steady-state parameters, transient parameters, time domain parameters and frequency domain parameters.
Specifically, the digital testing device in the second step includes a sensor, a signal conditioning circuit, a data acquisition circuit, and testing and analyzing software.
Specifically, the evaluation process for the steady-state ac voltage data processing software is as follows:
the data set of the instantaneous voltage u with the voltage modulation characteristic is constructed according to the formula (A.1) and the formula (A.2):
in the formula: u is a voltage instantaneous value V; u shapesdSetting a voltage square root value V; m is a modulation factor (0)<m<1)；fatThe frequency Hz is set amplitude modulation; f. ofsdIs set voltage frequency Hz; a is a set positive integer; [ f ] ofsd]Is not more than fsdIs the largest integer of (a).
After the data set constructed according to the formula (A.1) and the formula (A.2) is input into the steady-state alternating voltage test data processing software for processing, the obtained result conforms to the formula (A.3):
in the formula: u is a steady-state alternating voltage square root mean value V.
Set Usd、m、fsdThe value a is several different values to obtain several data sets, which are input into the data processing software to obtain approximately equal results.
Specifically, the evaluation process for the steady-state frequency test data processing software is as follows:
the data set of the instantaneous voltage u with the frequency modulation characteristic is constructed according to the formula (A.4), the formula (A.5) and the formula (A.6):
in the formula: m isfIs a frequency modulation coefficient; f. offtModulating the frequency Hz for the set frequency; Δ fsdThe maximum modulation amount Hz of the frequency; the other parameters have the same meanings as those in the formulae (A.1) and (A.2).
The data set constructed by the formula (A.4), the formula (A.5) and the formula (A.6) is input into the steady-state frequency test data processing software for processing, and the obtained result accords with the formula (A.7):
f＝fsd (A.7)
in the formula: f is the steady state frequency Hz.
Set Usd、fsd、ΔfsdAnd taking several groups of data sets constructed by different values a, respectively inputting the data sets into tested data processing software, and obtaining results which are approximately equal.
Specifically, the evaluation process of the voltage phase difference test data processing software is as follows:
constructing a data set of the instantaneous voltage u according to the formula (A.4), the formula (A.5) and the formula (A.6); then, the instantaneous voltage u is constructed according to the formula (A.8)XThe data set of (2):
the meaning of the parameters in formula (A.8) is the same as that indicated in formula (A.4).
U constructed by the formula (A.4), the formula (A.5) and the formula (A.6) and u constructed by the formula (A.8)XThe two data sets input voltage phase difference test data processing software; from u and uXThe results of different relative position calculations all correspond to formula (a.9):
specifically, the evaluation process of the ac distortion coefficient test data processing software is as follows:
the data set of the instantaneous voltage u is constructed according to the formula (A.1) and the formula (A.2).
Inputting the constructed data set into AC distortion coefficient test data processing software for processing, and obtaining the result according with the formula (A.10)
In the formula, KJJIs the ac distortion coefficient.
Set Usd、m、fsdThe value a is several different values to obtain several groups of data, which are input into the tested data processing software respectively, and the obtained results are all approximately equal.
Specifically, the evaluation process of the alternating current distortion frequency spectrum test data processing software is as follows:
two sets of data sets of instantaneous voltage are constructed according to the formulas (A.1), (A.2) and (A.4), (A.5) and (A.6), respectively.
The expression of u constructed by the formulas (A.1) and (A.2) can be expressed as follows:
the parameters in the formula are as defined in formula (A.1) and formula (A.2).
Filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
the spectrum is visible as two lines from formula (a.12), i.e.:
at fsd-fatThe treatment amplitude (root mean square value) is
At fsd+fatThe treatment amplitude (root mean square value) is
The expression for u constructed from formula (A.4), formula (A.5) and formula (A.6) can be:
in the formula: j. the design is a square0(mf)、J1(mf)、J2(mf)、J3(mf) … is the value determined by the Bessel function; the other parameters have the same meanings as those of the formulae (A.4), (A.5) and (A.6).
Filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
a series of spectra is obtained.
Compared with the prior art, the invention has the following beneficial technical effects:
the method solves the problem of verifying and evaluating the data processing software of the airplane power supply characteristic digital test equipment, because the equipment for characteristic parameter measurement has a plurality of sources in the characteristic test process of the airplane power supply system, the ground general digital test equipment and various special non-standard digital test equipment exist, a large amount of data processing and analyzing software exists in the equipment, some software can analyze the typical general parameter voltage effective value, frequency, phase difference, active power and the like of the airplane power supply characteristic, but the data processing principle cannot be confirmed, the method provided by the invention can evaluate the processing software in the equipment, thereby standardizing and unifying the airplane power supply characteristic parameter test result, providing consistent, reliable and accurate data for the characteristic test evaluation of the airplane power supply system, the method avoids the lengthening and delaying of the development period of the airplane caused by dispute of the test result, and has good military, social and economic benefits.
Drawings
FIG. 1 is a flow chart of a method for evaluating data processing software of an aircraft power supply characteristic testing system in accordance with the present invention;
FIG. 2 is a block diagram of the components of the digital test equipment for aircraft power supply characteristics;
FIG. 3 is a diagram of a power supply characteristic test analysis software validation evaluation implementation;
fig. 4 is a distorted spectrum diagram of an amplitude modulated signal (a-10);
fig. 5 is a frequency modulation signal distortion spectrogram (a-20);
fig. 6 is a distortion spectrum (a-5) of the frequency modulated signal;
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
The invention provides a method for detecting main data processing software of a test device, which is used for solving the problem of consistency of data processing software of a digital test system of power supply characteristic parameters of an airplane. Therefore, the problem of inconsistent test analysis results caused by data processing algorithm differences is fundamentally solved.
The aircraft power supply characteristic parameters comprise a plurality of indexes, such as alternating current and direct current steady-state parameters, transient parameters and the like, and specifically comprise the following characteristic parameters, and the index ranges of the characteristic parameters have great influence on the normal operation of an aircraft power supply system.
(1) AC parameter
Transient voltage, steady-state voltage, voltage peak value, three-phase average voltage, voltage unbalance, voltage modulation frequency characteristics and voltage interruption time;
transient current, steady state current, power factor;
transient frequency, steady state frequency, frequency change rate, frequency step change, frequency modulation, frequency drift;
crest factor, phase shift, single harmonic content, total harmonic content, voltage distortion, current distortion, distortion factor, distortion frequency spectrum, direct current component;
(2) direct current parameter
Transient voltage, steady-state voltage, voltage pulsation, pulsation frequency components, direct-current voltage distortion, distortion coefficient, distortion frequency spectrum, voltage interruption time, transient current and steady-state current;
in the analysis and test of the above parameters, it is necessary to use digital test equipment or system to test the electrical signals, such as voltage and current, of the aircraft power supply system to extract relevant characteristic parameters, so as to determine whether the parameters are within the range of the power supply characteristic requirements, as shown in table 1. A block diagram of a typical digital test device is shown in fig. 2, and includes a sensor, a signal conditioning circuit, a data acquisition circuit, test analysis software, and other key components, and on the basis of ignoring the influence of test device hardware on the difference of test analysis results, the difference of test analysis results may be caused by the difference of processing analysis methods of data processing software of different test devices, so that the evaluation work of the performance of an aircraft power supply system under different power supply systems is influenced. Therefore, it is necessary to design an evaluation software to judge whether the data processing algorithm meets the power supply characteristic requirements under different power supply systems.
TABLE 1 aircraft Power supply characteristics Steady-State and transient parameter Range
The invention provides a method for evaluating and judging data processing software, which is used for judging whether the main data processing software of test equipment meets the requirements, but is not the actual value of the power supply characteristic of an airplane. The evaluation process of the method is shown in fig. 1.
According to the analysis requirements of steady-state and transient parameters, time domain and frequency domain parameters of the power supply characteristics of the airplane to be analyzed and tested, data functions needing to reflect the power supply characteristics are constructed, the data functions are respectively input into digital test equipment needing to be tested to obtain test analysis results, meanwhile, the data functions are input into standard software of a data processing method according to the requirements of the power supply characteristics of the GJB181A airplane to obtain test results after analysis and test, and the two results are compared to obtain judgment results.
The following detailed detection method specifies the detection method of the data processing software of the aircraft power supply alternating current characteristic parameters, and the main steps and the verification process are as follows.
Example one
Detection of steady state AC voltage data processing software
1. Relational expression for detection
The data set of the instantaneous voltage u with the voltage modulation characteristic is constructed according to the formula (A.1) and the formula (A.2), and the data corresponds to the data function generation as shown in FIG. 1:
in the formula: u-voltage instantaneous value V;
Usd-a set voltage root mean square value V;
m-modulation factor (0< m < 1);
fat-the set amplitude modulation frequency Hz;
fsd-the set voltage frequency Hz;
a is a set positive integer;
[fsd]-not exceeding fsdIs the largest integer of (a).
2. Correct processing result
a) After the data set constructed according to the formula (A.1) and the formula (A.2) is input into the steady-state alternating voltage test data processing software for processing, the obtained result conforms to the formula (A.3):
in the formula: u-square root mean value V of steady-state alternating current voltage.
b) Set Usd、m、fsdThe value a is several different values to obtain several data sets, which are input into the data processing software to obtain approximately equal results.
3. Examples of the invention
a) The set parameter values are as follows:
Usd＝115V，m＝0.187，fsd＝399.75Hz；
the different values of a are:
a＝1、3、7。
b) the correct processing results of each group of data are
U＝116.00V
Example two
Detection of steady state frequency test data processing software
1. Relational expression for detection
The data set of the instantaneous voltage u with the frequency modulation characteristic is constructed according to the formula (A.4), the formula (A.5) and the formula (A.6):
in the formula: m isf-a frequency modulation factor;
fft-the set frequency modulation frequency Hz;
Δfsd-frequency maximum modulation Hz;
the other parameters have the same meanings as those in the formulae (A.1) and (A.2).
2. Correct processing result
a) The data set constructed by the formula (A.4), the formula (A.5) and the formula (A.6) is input into the steady-state frequency test data processing software for processing, and the obtained result accords with the formula (A.7):
f＝fsd (A.7)
in the formula: f-steady state frequency Hz.
b) Set Usd、fsd、ΔfsdAnd taking several groups of data sets constructed by different values a, respectively inputting the data sets into tested data processing software, and obtaining results which are approximately equal.
3. Examples of the invention
a) Set parameter value
Usd＝115V，fsd＝398.65Hz，Δfsd＝4.007Hz；
a is respectively 1, 3 and 7
b) The correct processing results of each group of data are
f＝398.65Hz
EXAMPLE III
Detection of voltage phase difference test data processing software
1. Relational expression for detection
Constructing a data set of the instantaneous voltage u according to the formula (A.4), the formula (A.5) and the formula (A.6); then, the instantaneous voltage u is constructed according to the formula (A.8)XThe data set of (2):
the meaning of the parameters in formula (A.8) is the same as that indicated in formula (A.4).
2. Correct processing result
U constructed by the formula (A.4), the formula (A.5) and the formula (A.6) and u constructed by the formula (A.8)XThe two data sets input voltage phase difference test data processing software; from u and uXThe results of different relative position calculations all correspond to formula (a.9):
3. examples of the invention
a) Set parameter value
Usd＝115V，fsd＝398.65Hz，Δfsd＝4.007Hz，a＝3、5；
The following 4 u and u are usedXThe relative position of (2) is calculated:
b) all of the correct processing results theta
(i.e., 120.0 degree)
Example four
Detection of AC distortion coefficient test data processing software
1. Relational expression for detection
The data set of the instantaneous voltage u is constructed according to the formula (A.1) and the formula (A.2).
2. Correct processing result
a) Inputting the constructed data set into AC distortion coefficient test data processing software for processing, and obtaining the result according with the formula (A.10)
In the formula, KJJ-AC distortion factor
b) Set Usd、m、fsdThe value a is several different values to obtain several groups of data, which are input into the tested data processing software respectively, and the obtained results are all approximately equal.
3. Examples of the invention
Is provided with a Usd＝115V,m＝0.187,fsd399.75; the correct processing results obtained by respectively taking the groups of data a as 3, 10 and 20 are all
KJJ＝0.707×0.187＝0.132
EXAMPLE five
Detection of AC distorted frequency spectrum test data processing software
1. Relational expression for detection
Two sets of data sets of instantaneous voltage are constructed according to the formulas (A.1), (A.2) and (A.4), (A.5) and (A.6), respectively.
2. Correct processing result
a) The expression of u constructed by the formulas (A.1) and (A.2) can be expressed as follows:
the parameters in the formula are as defined in formula (A.1) and formula (A.2).
Filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
the spectrum is visible as two lines from formula (a.12), i.e.:
at fsd-fatThe treatment amplitude (root mean square value) is
At fsd+fatThe treatment amplitude (root mean square value) is
b) The expression for u constructed from formula (A.4), formula (A.5) and formula (A.6) can be:
in the formula: j. the design is a square0(mf)、J1(mf)、J2(mf)、J3(mf) … is the value determined by the Bessel function; the other parameters have the same meanings as those of the formulae (A.4), (A.5) and (A.6).
Filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
a series of spectra are obtained.
3. Examples of the invention
a) By Usd＝115V，m＝0.187，fsd＝399.75Hz，a＝10
Two spectral lines as shown in FIG. 4 are obtained by substituting the formula (A.1) and the formula (A.2):
at 389.731Hz, the amplitude (root mean square value) was 10.752V;
at 409.769Hz, the amplitude (root mean square value) was 10.752V.
b) By Usd＝115V，fsd＝398.65Hz，Δfsd＝4.007Hz，a＝20
Substituting formula (a.4), formula (a.5) and formula (a.6) results in 4 spectral lines (other edge frequencies have very small amplitudes) as shown in fig. 5:
at 358.65Hz, the amplitude (root mean square value) is 0.575V, [115J2(0.2)＝115×0.005]；
At 378.62Hz, the amplitude (root mean square value) was 11.385V, [115J1(0.2)＝115×0.099]；
At 418.68Hz, the amplitude (root mean square value) was 11.385V, [115J1(0.2)＝115×0.099]；
At 438.72Hz, the amplitude (root mean square value) is 0.575V, [115J2(0.2)＝115×0.005]。
c) If the value of a in b) is reduced, m is increasedf>0.2, the distortion spectrum of the constructed u is more spectral lines. For example, when a is 5 (m)f0.8), 8 lines as shown in fig. 6 are obtained, respectively:
at 378.62Hz, the amplitude (root mean square value) was 0.115V, [ 115X 0.001 ];
at 383.63Hz, the amplitude (root mean square value) was 1.150V, [ 115X 0.010 ];
at 398.63Hz, the amplitude (root mean square value) was 8.625V, [ 115X 0.075 ];
at 393.64Hz, the amplitude (root mean square value) was 42.320V, [ 115X 0.368 ];
at 403.66Hz, the amplitude (root mean square value) was 42.320V, [ 115X 0.368 ];
at 408.67Hz, the amplitude (root mean square value) was 8.625V, [ 115X 0.075 ];
at 413.67Hz, the amplitude (root mean square value) was 1.150V, [ 115X 0.010 ];
at 418.68Hz, the amplitude (root mean square value) was 0.115V, [ 115X 0.001 ].
4. Lines outside of theoretical values
There may be some spectral lines beyond the theoretical spectral line due to the effect of calculation errors, but the amplitude should generally be below-35 dB.
EXAMPLE six
In order to meet the verification of the test analysis software of the aircraft power supply system, in particular to an alternating current system, firstly, as shown in figure 3, an aircraft power supply characteristic test analysis software evaluation computer based on a virtual instrument platform is constructed, a computer platform based on a PCI or PXI bus is adopted, a high-performance data acquisition card is configured to comprise a D/A output function, the sampling rate can reach 1MHZ, an onboard memory can reach 2MB, the continuous signal sequence output function is met, a graphic programming language based on LABVIEW software is adopted, a function group based on formulas A (1) to A (14) is constructed, a standard signal is generated and output to digital test equipment to be evaluated for test analysis, a modulation parameter a is changed according to a corresponding standard analysis function formula, the computer generates different standard data waveforms, and the obtained relevant analysis result is compared with the given standard formula group, so as to judge whether the analysis software of the digital test equipment for the power supply characteristics of the airplane meets the requirements of national military standards 181A and B.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (5)
1. An evaluation method of airplane power supply characteristic test analysis algorithm software is characterized by comprising the following steps: the method comprises the following steps:
step one, generating a data function reflecting power supply characteristics according to analysis requirements of airplane power supply characteristic parameters to be analyzed and tested;
inputting the data function generated in the first step into digital test equipment to be tested to obtain a test analysis result;
inputting the data function generated in the step one into standard software of a data processing method according to the power supply characteristic requirements of the national military standard aircraft, and obtaining a test result after analysis and test;
step four, comparing and comparing the test results obtained in the step two and the step three to obtain a judgment result;
the aircraft power supply characteristic parameters in the first step comprise steady-state parameters, transient parameters, time domain parameters and frequency domain parameters;
the digital testing equipment in the second step comprises a sensor, a signal conditioning circuit, a data acquisition circuit and testing analysis software;
the evaluation process for the steady state ac voltage data processing software is as follows:
the data set of the instantaneous voltage u with the voltage modulation characteristic is constructed according to the formula (A.1) and the formula (A.2):
in the formula: u is a voltage instantaneous value V; u shapesdSetting a voltage square root value V; m is a modulation factor (0)<m<1)；fatThe frequency Hz is set amplitude modulation; f. ofsdIs set voltage frequency Hz; a is a set positive integer; [ f ] ofsd]Is not more than fsdThe largest integer of (a);
after the data set constructed according to the formula (A.1) and the formula (A.2) is input into the steady-state alternating voltage test data processing software for processing, the obtained result conforms to the formula (A.3):
in the formula: u is a steady-state alternating voltage square root mean value V;
set Usd、m、fsdThe value a is several different values to obtain several data sets, which are input into the data processing software to obtain approximately equal results.
2. The method for evaluating aircraft power supply characteristic test analysis algorithm software according to claim 1, wherein: the evaluation process for the steady-state frequency test data processing software is as follows:
the data set of the instantaneous voltage u with the frequency modulation characteristic is constructed according to the formula (A.4), the formula (A.5) and the formula (A.6):
in the formula: m isfIs a frequency modulation coefficient; f. offtModulating the frequency Hz for the set frequency; Δ fsdThe maximum modulation amount Hz of the frequency; the other parameters have the same meanings as those expressed in the formula (A.1) and the formula (A.2);
the data set constructed by the formula (A.4), the formula (A.5) and the formula (A.6) is input into the steady-state frequency test data processing software for processing, and the obtained result accords with the formula (A.7):
f＝fsd (A.7)
in the formula: f is the steady state frequency Hz;
set Usd、fsd、ΔfsdAnd taking several groups of data sets constructed by different values a, respectively inputting the data sets into tested data processing software, and obtaining results which are approximately equal.
3. The method for evaluating aircraft power supply characteristic test analysis algorithm software according to claim 2, wherein: the evaluation process of the voltage phase difference test data processing software is as follows:
constructing a data set of the instantaneous voltage u according to the formula (A.4), the formula (A.5) and the formula (A.6); then, the instantaneous voltage u is constructed according to the formula (A.8)XThe data set of (2):
the meaning of the parameters in formula (A.8) is the same as that represented in formula (A.4);
u constructed by the formula (A.4), the formula (A.5) and the formula (A.6) and u constructed by the formula (A.8)XThe two data sets input voltage phase difference test data processing software; from u and uXThe results of different relative position calculations all correspond to formula (a.9):
4. the method for evaluating aircraft power supply characteristic test analysis algorithm software according to claim 1, wherein: the evaluation process of the AC distortion coefficient test data processing software is as follows:
constructing a data set of the instantaneous voltage u according to the formula (A.1) and the formula (A.2);
inputting the constructed data set into AC distortion coefficient test data processing software for processing, and obtaining the result according with the formula (A.10)
In the formula, KJJIs an AC distortion coefficient;
set Usd、m、fsdThe value a is several different values to obtain several groups of data, which are input into the tested data processing software respectively, and the obtained results are all approximately equal.
5. The method for evaluating aircraft power supply characteristic test analysis algorithm software according to claim 2, wherein: the evaluation process of the alternating current distortion frequency spectrum test data processing software is as follows:
constructing two sets of data sets of instantaneous voltage according to the formulas (A.1), (A.2), (A.4), (A.5) and (A.6) respectively;
the expression of u constructed by the formulas (A.1) and (A.2) can be expressed as follows:
the parameters in the formula are the same as the formula (A.1) and the formula (A.2);
filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
the spectrum is visible as two lines from formula (a.12), i.e.:
at fsd-fatThe square root mean square value of the treatment range is
At fsd+fatThe square root mean square value of the treatment range is
The expression for u constructed from formula (A.4), formula (A.5) and formula (A.6) can be:
in the formula: j. the design is a square0(mf)、J1(mf)、J2(mf)、J3(mf) … is the value determined by the Bessel function; the other parameters have the same meanings as those of the formulae (A.4), (A.5) and (A.6);
filtering out fundamental wave to obtain instantaneous value u of AC voltage distortion waveformjjExpression (c):
a series of spectra is obtained.
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