A method for extracting engine state parameters corresponding to crystal temperature measurement

Abstract

The application provides a crystal temperature measurement corresponding engine state parameter extraction method, and belongs to the field of engine test data processing, comprising: setting a measuring point on an engine provided with a crystal to measure engine state parameters, operating the engine to a temperature measurement state, and collecting measuring point data of the engine state parameters; selecting one parameter from the engine state parameters as a discrimination parameter, screening the collected measuring point data of the engine state parameters and corresponding transient time according to the discrimination parameter to form a measuring point data set; arranging the measuring point data set according to the collected transient time, calculating the time used by each measuring point, sorting each measuring point of all discrimination parameters and calculating the cumulative time of the measuring point; selecting each measuring point of the discrimination parameter with the cumulative time within the target time, and calculating the statistical value of each measuring point; comparing and removing to obtain a sorting set, extracting all the remaining measuring points in the sorting set except the discrimination parameter and performing statistics to obtain each engine state parameter corresponding to the crystal temperature measurement.

Description

Technical Field

[0001] The present application relates to the field of engine test data processing, and in particular to a method for extracting engine state parameters corresponding to crystal temperature measurement. Background Art

[0002] Crystal temperature measurement technology is a temperature measurement technology based on the temperature memory effect and the thermal stability of irradiation defects in crystal materials. Crystal temperature measurement technology is an ideal measurement method for measuring surface or airflow temperatures at typical locations on aircraft engines.

[0003] When using crystals to measure engine wall temperature, measurements must be taken for 3 to 7 minutes at the highest wall temperature. However, due to test mission and procedure limitations, engine parameters at the highest wall temperature—such as gas or air conditioning temperature and pressure—are often intermittent, fluctuating, and exhibit intermittent measurements.

[0004] Existing methods for extracting engine state parameters corresponding to crystal temperature measurement states typically directly select engine state parameters from a large temperature measurement period and perform simple averaging to obtain the required data. However, this method fails to account for discontinuities and fluctuations in engine state parameters, resulting in significant errors and making it difficult to determine engine status based on these parameters.

[0005] Therefore, a method is needed to extract the engine state parameters corresponding to the crystal temperature measurement. Summary of the Invention

[0006] The purpose of this application is to provide a method for extracting engine state parameters corresponding to crystal temperature measurement, so as to solve or alleviate at least one problem in the background technology.

[0007] The technical solution of this application is: a method for extracting engine state parameters corresponding to crystal temperature measurement, comprising:

[0008] Setting measuring points on the engine with crystals to measure engine status parameters, running the engine to a temperature measurement state, and collecting measuring point data of the engine status parameters;

[0009] A parameter is selected from the engine state parameters as a discrimination parameter, and according to a predetermined range of the discrimination parameter, the collected measurement point data of the engine state parameter and its corresponding transient time are screened to form a measurement point data set, and the measurement point data set is smoothed;

[0010] Arrange the measurement point data set according to the collected transient time, set the transient time of the first measurement point to zero, and the time used by the remaining measurement points is the difference between the transient time of the next measurement point and the transient time of the previous measurement point, so as to obtain the time used by each measurement point. Sort all the measurement points of the discrimination parameters in descending order according to the temperature value, and calculate the cumulative time of the measurement points;

[0011] Select each measuring point of the discriminant parameter whose cumulative time is within the target time, extract and rearrange it, record the original sorting sequence of the measuring points, and calculate the statistics of each selected measuring point;

[0012] The original sorting numbers of the measurement points of the selected discrimination parameters are compared and duplicated to obtain a sorted set. All the remaining measurement points except the discrimination parameters in the sorted set are extracted, and statistics are performed on all the remaining measurement points to obtain the engine state parameters corresponding to the crystal temperature measurement.

[0013] Preferably, the engine state parameters include the total temperature, total pressure, static pressure of the gas inlet and outlet, and the temperature and pressure of the cold gas inlet and outlet cavity.

[0014] Preferably, the discrimination parameter is the pre-turbine temperature or the engine exhaust temperature.

[0015] Preferably, in the screening and collection data, the predetermined range includes the maximum value of the discrimination parameter, which is used to characterize the highest state of the engine.

[0016] Preferably, the method for smoothing the screened measurement point data set includes the Lowess method.

[0017] Preferably, the target time is 3 minutes to 7 minutes.

[0018] Preferably, the statistical values ​​include an average temperature value, a maximum temperature value, and a minimum temperature value.

[0019] The engine state parameter extraction method corresponding to the crystal temperature measurement of the present application can accurately obtain the corresponding engine state parameters during the crystal measurement process by screening and smoothing the measurement point parameter data of the test state, sorting the discrimination parameters, and calculating the time. It takes into account the factors that the parameters are non-continuous, intermittent, and show an oscillating trend at the highest state, and the calculation results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0021] Figure 1 This is a schematic diagram of the engine state parameter extraction method of this application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0023] This application proposes a method for extracting engine status parameters corresponding to the temperature measurement of a certain part of the engine using a crystal. Through data screening, smoothing, sorting of discrimination parameters, and time calculation, the engine status parameters corresponding to the crystal temperature measurement are accurately extracted. The factor that the engine status parameters are non-continuous, intermittent, and show an oscillating trend in the highest temperature state is taken into account, and the calculation results are more accurate.

[0024] like Figure 1 As shown, the method for extracting engine state parameters corresponding to crystal temperature measurement provided by this application includes the following process:

[0025] Step S10: data measurement.

[0026] A crystal is placed on a certain part or component of the engine to measure temperature. For example, when measuring the maximum wall temperature of the engine, the crystal can be embedded in the outer wall of the turbine cooling blade to measure the maximum wall temperature. At the same time, measurement points for measuring engine status parameters are arranged as needed. The engine is operated to collect engine status parameters during operation. These engine status parameters include the total temperature, total pressure, and static pressure of the gas inlet and outlet, as well as the cavity temperature and cavity pressure of the cooling gas inlet and outlet. Temperature and pressure measurement points can be set at locations such as the turbine inlet and outlet and the cooling gas flow path inlet and outlet to measure the above measurement point data.

[0027] Step S20: data preprocessing.

[0028] S21, data screening:

[0029] A parameter is selected from the engine parameters as a discriminant parameter. The collected engine state parameter data and its corresponding transient time measurement point data are filtered according to a predetermined range of the discriminant parameter to form a measurement point data set. In a preferred embodiment of the present application, the turbine pre-temperature or the engine exhaust temperature (i.e., the total temperature at the gas outlet) is selected as the discriminant parameter for determining and monitoring the engine state during the crystal temperature measurement process.

[0030] Screening involves measuring the required engine state parameters for the large state range (i.e., high engine speed) and the corresponding transient time. The large state range can be determined using discriminant parameters such as pre-turbine temperature or engine exhaust temperature. During screening, a discriminant parameter is selected and given a specific range. When the discriminant parameter meets the range requirements, all parameter data for the corresponding time period are extracted.

[0031] For example, in the embodiment of the present application, the pre-turbine temperature is selected as the discrimination parameter, and considering the uneven distribution of the combustion chamber outlet and the measurement deviation, (T4*-1000, T4*max) is selected as the screening range, where T4* is the pre-turbine temperature of the corresponding state of the crystal temperature measurement, and T4*max is the maximum value of all T4* measurement points.

[0032] S22, data smoothing: smoothing the filtered data.

[0033] Affected by engine operation and test accuracy, normal measurement point data will also show up and down jumps within a small range, so the filtered measurement point data set is smoothed.

[0034] For example, in this embodiment of the present application, Lowess (local weighted regression algorithm) is used to smooth the temperature before the turbine, and local regression is performed using weighted linear least squares based on a first-order polynomial model.

[0035] Step S30, calculating the time used for measuring the points.

[0036] Time Calculation: Arrange the measurement point data sets according to the transient times collected during the test and assign them a sorting number, n. Set the time for the first measurement point to 0. For the remaining measurement points, subtract the transient time of the previous measurement point from the subsequent measurement point's transient time to calculate the elapsed time for each measurement point. Because the measurement point data collected during the test is very dense, the time is magnified.

[0037] Table 1 shows an example of time magnification of the measurement point data in this embodiment of the present application. In this embodiment, the time is magnified by 10 7 times.

[0038] Table 1 Time calculation (partial data)

[0039] Sort number Raw instant time - double precision format Zoomed in time 1 0.445548379629630 0 2 0.445549074074074 6.94444444504505 3 0.445549884259259 8.10185185162737 4 0.445550578703704 6.94444444448994 5 0.445552546296296 19.6759259257773 6 0.445553356481482 8.10185185162737 7 0.445553935185185 5.78703703679739 8 0.445555324074074 13.8888888895350 9 0.445556365740741 10.4166666659022 10 0.445557060185185 6.94444444504505 11 0.445558564814815 15.0462962961173 12 0.445559490740741 9.25925925931992 13 0.445560069444444 5.78703703679739 14 0.445561805555556 17.3611111109473 15 0.445562384259259 5.78703703735251 16 0.445563773148148 13.8888888889799 17 0.445565277777778 15.0462962966724 18 0.445565972222222 6.94444444393483 19 0.445566782407407 8.10185185218248 20 0.445567592592593 8.10185185162737 …… …… …… 340 0.445813657407407 6.94444444448994 341 0.445814351851852 6.94444444448994 342 0.445815162037037 8.10185185162737 343 0.445815856481482 6.94444444504505 344 0.445816666666667 8.10185185162737 …… …… ……

[0040] Afterwards, all the measurement points of the discrimination parameters are sorted in descending order of temperature values, and the cumulative time of the measurement points is calculated.

[0041] Table 2 shows an example of sorting some measurement points of the pre-turbine temperature T4* in this embodiment of the present application.

[0042] Table 2 Sorted T4* measurement point 1 (partial data)

[0043]

[0044]

[0045]

[0046] Step S40: Extracting and calculating discrimination parameters.

[0047] Select each measurement point of the discrimination parameter whose cumulative time is within the target time (including the target time) and record the original sorting number n_i of each. In this application, the target time is selected within the range of 3-7 minutes.

[0048] For example, in one embodiment of the present application, the target time is 5 minutes, and 4238, 3554, and 4113 sets of data are extracted from the discrimination parameter measuring points 1, 4, and 16, respectively, as shown in Table 3.

[0049] Table 3 Original order n_i of T4* measuring points within target time (partial data)

[0050]

[0051]

[0052] Perform discriminant parameter analysis and calculate the average temperature value Tta_i, maximum temperature value Ttmax_i, minimum temperature value Ttmin_i, distribution law, etc. of each selected measuring point.

[0053] As shown in Table 4, the average temperature value Tta_i, the maximum temperature value Ttmax_i and the minimum temperature value Ttmin_i of the discrimination parameters of this embodiment of the present application are shown.

[0054] Table 4 Average temperature, maximum value and minimum value of T4* measuring point (partial parameters)

[0055] Average temperature (K) Maximum temperature (K) Minimum temperature (K) T4* measuring point 1 1329.413 1350.338 1310.154 T4* measuring point 4 1439.361 1462.034 1418.196 T4* measuring point 16 1547.851 1557.766 1539.195

[0056] Step S50: extracting engine state parameters.

[0057] Compare and remove duplicates from the original sorted sequence numbers n_i of the selected discriminant parameter measurement points to obtain a sorted set N. Extract all measurement points from sorted set N, excluding the discriminant parameter. Perform statistical analysis on the remaining measurement points, such as calculating the average, maximum, minimum, and distribution patterns, to obtain the engine state parameters corresponding to the crystal temperature measurement.

[0058] In the embodiment shown in Table 5, the original sorting order n_i of the 24 turbine pre-temperature T4* measurement points was compared, and duplicate data was removed to obtain the sorted set N. Table 6 shows the extracted data for the remaining measurement points. As shown in Table 7, engine state parameters such as the total and static pressures at the gas inlet and outlet, and the cavity temperature and pressure at the cold gas inlet and outlet were extracted using the aforementioned method. The average, maximum, minimum, and distribution patterns of each engine state parameter were calculated. Thus, the engine state parameters corresponding to the crystal temperature measurement were obtained.

[0059] Table 5 Repeated T4* measurement point numbers (partial data)

[0060] Duplicate measurement point numbers Number of repetitions 1 2537 11 2 2538 11 3 2539 11 4 2540 14 5 2541 14 6 2542 21 7 2543 18 8 2544 19 9 2545 18 10 2546 21 11 2547 21 12 2548 21 13 2549 16 14 2550 16 15 2551 15 16 2552 19 17 2553 20 18 2554 16 19 2555 15 20 2556 15 …… …… 340 2876 13 341 2877 15 342 2878 14 343 2879 12 344 2880 11 …… …… 3551 11844 10 3552 11845 11 3553 11846 18 3554 11847 12 3555 11848 12 …… …… ……

[0061] Table 6 Data of other measuring points (partial parameters)

[0062]

[0063]

[0064] Table 7 Average temperature, maximum value, minimum value (partial parameters) of the remaining measurement points

[0065] average value Maximum Minimum Gas inlet total pressure measuring point 2-3 (KPa) 2688.69 2721.96 2622.2 Gas inlet static pressure measuring point 2 (KPa) 1269.32 1298.42 1233.36 Air conditioning inlet temperature measurement point 2 (K) 569.85 580.00 549.84 Air conditioning inlet pressure measurement point 1 (KPa) 2762.36 2795.19 2694.73 …… …… …… ……

[0066] The engine state parameter extraction method corresponding to the crystal temperature measurement of the present application can accurately obtain the corresponding engine state parameters during the crystal measurement process by screening and smoothing the measurement point parameter data of the test state, sorting the discrimination parameters, and calculating the time. The factor that the parameters are non-continuous, intermittent, and show an oscillating trend in the highest state is taken into account, and the calculation results are more accurate.

[0067] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for extracting engine state parameters corresponding to crystal temperature measurement, characterized in that: include: Setting measuring points on the engine with crystals to measure engine status parameters, running the engine to a temperature measurement state, and collecting measuring point data of the engine status parameters; A parameter is selected from the engine state parameters as a discrimination parameter, and according to a predetermined range of the discrimination parameter, the collected measurement point data of the engine state parameter and its corresponding transient time are screened to form a measurement point data set, and the measurement point data set is smoothed; Arrange the measurement point data set according to the collected transient time, set the time of the first measurement point to zero, and the time of the remaining measurement points to the difference between the transient time of the next measurement point and the transient time of the previous measurement point, so as to obtain the time used by each measurement point, sort all the measurement points of the discrimination parameter in descending order according to the temperature value, and calculate the cumulative time of the measurement points; Select each measuring point of the discriminant parameter whose cumulative time is within the target time, record the original sorting sequence number of the measuring point, and calculate the statistical value of each selected measuring point; The original sorting numbers of the measurement points of the discrimination parameters are compared and duplicated to obtain a sorted set. All the remaining measurement points except the discrimination parameters in the sorted set are extracted, and statistics are performed on all the remaining measurement points to obtain the engine state parameters corresponding to the crystal temperature measurement.

2. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 1, characterized in that: The engine status parameters include the total temperature, total pressure, static pressure of the gas inlet and outlet, and the temperature and pressure of the cold gas inlet and outlet cavity.

3. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 2, characterized in that: The discrimination parameter is the pre-turbine temperature or the engine exhaust temperature.

4. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 3, characterized in that: In the screening and collection of data, the predetermined range includes the maximum value of the discrimination parameter, which is used to characterize the highest state of the engine.

5. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 1, characterized in that: Methods for smoothing the selected measurement point data set include the Lowess method.

6. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 1, characterized in that: The target time is 3 minutes to 7 minutes.

7. The method for extracting engine state parameters corresponding to crystal temperature measurement according to claim 1, characterized in that: The statistical values ​​include average value, maximum value and minimum value.

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