Method and device for determining high-cycle fatigue test run program of aero-engine

Abstract

The invention belongs to the technical field of aero-engine fatigue tests, and particularly relates to an aero-engine high-cycle fatigue test run program determination method and device. The method comprises the steps that S1, the number of test run stages is determined according to the total test run staying time and the longest test run duration of each stage; s2, the total test run staying time is grouped, the time of each group is obtained by multiplying the number of test run stages by the longest staying time of each rotating speed step, and each rotating speed step containing time parameters is added into each group according to the set rotating speed step sequence and the required staying time of each rotating speed step; s3, one or more rotating speed steps corresponding to the nth longest residence time are extracted from each group in sequence, and an nth test run stage is formed; and S4, performing high-cycle fatigue test run according to each rotating speed step included in each test run stage and the time parameter of each rotating speed step. The test run efficiency can be improved, and memory and operation are facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engine fatigue test, and particularly relates to a method and device for determining a high-cycle fatigue test procedure of an aero-engine. BACKGROUND

[0002] In the development process of an aero-engine, high-cycle fatigue tests are carried out to confirm whether the high-cycle fatigue resistance of the engine meets the requirements.

[0003] At present, when carrying out high-cycle fatigue tests, several types of test procedures are generally set, the test procedures are randomly arranged in batches and steps according to the test speeds and dwell times determined by the strength department, and finally it is confirmed whether the requirements are met through statistics. This method for determining the test procedures is not only time-consuming and laborious, but also inconvenient for operation and memory due to the non-integer minutes of the test time and the differences in the number of stages of various test procedures. SUMMARY

[0004] To solve the above problems, the application provides a method and device for determining a high-cycle fatigue test procedure of an aero-engine.

[0005] The first aspect of the application provides a method for determining a high-cycle fatigue test procedure of an aero-engine, mainly comprising:

[0006] Step S1, determining the number of test stages according to the total test dwell time and the longest duration of each stage test;

[0007] Step S2, grouping the total test dwell time, the time of each group being the product of the number of test stages and the longest dwell time of each speed step, adding each speed step containing time parameters to each group in the order of the set speed steps and the time required to dwell at each speed step;

[0008] Step S3, extracting one or more speed steps corresponding to the nth longest dwell time from each group in order to form the nth test stage;

[0009] Step S4, carrying out high-cycle fatigue tests according to the speed steps contained in each test stage and the time parameters of the speed steps.

[0010] Preferably, step S1 further comprises:

[0011] Step S11, obtaining the speed steps of the given high-cycle fatigue test and the time required to dwell at each speed step;

[0012] Step S12, determining the total test dwell time;

[0013] Step S13, determining the number of test stages by dividing the total test dwell time by the longest duration of each stage test.

[0014] Preferably, step S2 further comprises:

[0015] Step S21, sorting the rotating speed steps in ascending order according to the rotating speed;

[0016] Step S22, sorting the odd-numbered rotating speed steps in ascending order as the first half of the set rotating speed step sequence, and sorting the even-numbered rotating speed steps in descending order as the second half of the set rotating speed step sequence.

[0017] Preferably, step S4 further comprises adding a warm-up step at the beginning of each test stage and a cold-down step at the end of each test stage.

[0018] The second aspect of the present application provides an aero-engine high-cycle fatigue test program determination device, mainly comprising:

[0019] A test stage number determination module is configured to determine the test stage number according to the total test residence time and the longest duration of each test stage;

[0020] A grouping construction module is configured to group the total test residence time, each group having a time equal to the test stage number multiplied by the longest residence time of each rotating speed step, and to add each rotating speed step containing a time parameter to each group according to the set rotating speed step sequence and the required residence time of each rotating speed step;

[0021] A test stage splicing module is configured to extract one or more rotating speed steps corresponding to the nth longest residence time from each group in sequence to form the nth test stage;

[0022] A test module is configured to perform high-cycle fatigue test according to each rotating speed step contained in each test stage and the time parameter of each rotating speed step.

[0023] Preferably, the test stage number determination module comprises:

[0024] A rotating speed step parameter acquisition unit is configured to acquire the rotating speed steps of a given high-cycle fatigue test and the residence time required for each rotating speed step;

[0025] A total residence time calculation unit is configured to determine the total test residence time;

[0026] A test stage number calculation unit is configured to divide the total test residence time by the longest duration of each test stage to determine the test stage number.

[0027] Preferably, the grouping construction module comprises:

[0028] The rotating speed sorting unit sorts the rotating speed steps in ascending order according to the rotating speed.

[0029] The rotating speed step sequence setting unit sorts the odd-numbered rotating speed steps in ascending order as the first half of the set rotating speed step sequence, and sorts the even-numbered rotating speed steps in descending order as the second half of the set rotating speed step sequence.

[0030] Preferably, the test module comprises a warm-up and cool-down step adding unit, which adds a warm-up step at the front of each test stage and adds a cool-down step at the rear of each test stage.

[0031] The present application can improve test efficiency and facilitate memory and operation. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a flowchart of a preferred embodiment of the method for determining a high-cycle fatigue test procedure of an aero-engine. DETAILED DESCRIPTION

[0033] To make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings. Identical or similar labels in the drawings represent identical or similar elements or elements with identical or similar functions. The described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0034] The first aspect of the present application provides a method for determining a high-cycle fatigue test procedure of an aero-engine, as shown in Figure 1 The method mainly comprises the following steps:

[0035] Step S1: determining the number of test stages according to the total test dwell time and the longest duration of each test stage.

[0036] In some optional embodiments, step S1 further comprises:

[0037] Step S11: obtaining the rotating speed steps of a given high-cycle fatigue test and the time required for each rotating speed step to dwell;

[0038] Step S12: determining the total test dwell time;

[0039] Step S13, divide the total test time by the longest time of each stage to determine the number of test stages.

[0040] In this embodiment, first, in step S11, the high-cycle fatigue test speed determined by the strength professional is examined (the critical speed calculated and tested, the speed with high vibration stress, etc.), and the time t1(i) required to stay at each speed step, where i is between 1 and m, m is the number of speed steps examined, for example, the time t1(1)=20min required to stay at 80% speed step, the time t1(2)=30min required to stay at 81% speed step, the time t1(3)=25min required to stay at 82% speed step.

[0041] Then, in step S12, the time required to stay at all the above speed steps is counted, and the total test time t2 can be obtained.

[0042] Then, in step S13, according to the previous test experience (the longest test time that can guarantee no failure) and the reliable working time of the test bench personnel / equipment, the longest time t3 of each stage test is determined, t3 is generally 1-3 hours; too long may cause engine / equipment failure and cannot be found in time, too short will lead to low test efficiency (each stop needs to be checked and the engine warm-up / cold machine is restarted). Thus, according to t2 / t3, the number of test stages N is determined. That is, the entire test needs to start and stop the engine N times to cover the engine fatigue test process at each speed.

[0043] The subsequent steps are used to determine how the engine speed changes in each of the N test stages.

[0044] Step S2, group the total test time, the time of each group is the number of test stages multiplied by the longest stay time of each speed step, and according to the set speed step order and the time required to stay at each speed step, each speed step containing time parameters is added to each group.

[0045] First, according to the previous test experience, the longest stay time t4 of each speed step is determined, t4 is determined according to the longest stay time of the test results of the parts or other tests, for example, in a test stage, each speed step is only allowed to stay for 5 minutes, that is, t4=5min, here it is distinguished from the time t1(i) required to stay at each speed step, as described above, the time t1(1)=20min required to stay at 80% speed step, that is, 80% speed step needs to be examined for 20 minutes, but in a test stage, only 5 minutes of stay is allowed, that is, at least four test stages are required to fully meet the above examination requirements.

[0046] In step S2, the concept of group is introduced, and the time length of one group is N*t4, for example, N=5, t4=5min, and the time length of one group is 25min.

[0047] Then, each speed step containing time parameter is added to each group according to the set speed step sequence. Assuming that the set speed step sequence is ascending step sequence, according to the previous example: t1(1)=20min, t1(2)=30min, t1(3)=25min.

[0048] Then, 20min of t1(1) is all added to the first group, the first 5min of t1(2) is added to the first group, and together they form a group with a time length of 25min, the last 25min of t1(2) is added to the second group, and 25min of t1(3) is added to the third group.

[0049] In some optional embodiments, step S2 further comprises:

[0050] Step S21, sorting the speed steps in ascending order according to the speed;

[0051] Step S22, sorting the odd-numbered speed steps from low to high as the first half of the set speed step sequence, and sorting the even-numbered speed steps from high to low as the second half of the set speed step sequence.

[0052] This embodiment gives a preferred embodiment of constructing the set speed step sequence, for example, the speed step sequence is composed of 80%, 82%, 84%, 86%……100%, 99%, 97%……83%, 81%. In this way, the engine state can be more fully tested, and both the ascending steps and the descending steps can be tested.

[0053] Step S3, extracting one or more speed steps corresponding to the nth longest residence time from each group in order to form the nth test stage;

[0054] Still taking the previous example, when n=1, the first speed step corresponding to the first 5min (80%) is extracted from the first group, the first speed step corresponding to the first 5min (81%) is extracted from the second group, and the first speed step corresponding to the first 5min (82%) is extracted from the third group……to form the first test stage. Similarly, when n=2, the second speed step corresponding to the first 5min (80%) is extracted from the first group, the second speed step corresponding to the first 5min (81%) is extracted from the second group, and the second speed step corresponding to the first 5min (82%) is extracted from the third group……to form the second test stage.

[0055] Step S4, high cycle fatigue test is carried out according to each rotating speed step contained in each test stage and the time parameter of each rotating speed step.

[0056] In some optional embodiments, step S4 further comprises adding a warm-up step at the front of each test stage and a cold start step at the rear of each test stage.

[0057] In this embodiment, necessary warm-up and cold start steps are added before and after the test procedure, and the high cycle fatigue test of each stage is carried out by selecting one or more rotating speeds in each group (when the remaining time of each rotating speed is not enough for t4) for staying, and the longest staying time of each group is t4, so that the high cycle fatigue test procedure is determined.

[0058] In addition, it should be noted that there may be overlapping rotating speeds between groups, and the same rotating speed step needs to be arranged in between during the test, for example, in the foregoing embodiment, when n=5, the rotating speed steps extracted from the first group and the second group are both 81%, and other rotating speed steps can be added between these two same rotating speed steps. Due to the possibility of rotating speed fluctuation, the test results need to be counted every test day or every few test days, and the completed test steps are deleted as soon as possible to avoid unnecessary examination and waste of test time.

[0059] The present application can greatly improve the efficiency of high cycle fatigue test (as little as possible to stop, reduce unnecessary warm-up and cold start time), and is beneficial to the memory and operation of the test personnel (the time of each step is fixed, and the throttle operation is less), the prepared high cycle fatigue test procedure can be flexibly arranged according to the test time (only need to be reduced in proportion), which can meet the demand of flexible test arrangement of the test bench.

[0060] The second aspect of the present application provides an aero-engine high cycle fatigue test procedure determination device corresponding to the above method, mainly comprising:

[0061] A test stage number determination module is configured to determine the number of test stages according to the total test staying time and the longest time of each stage test;

[0062] A grouping construction module is configured to group the total test staying time, and the time of each group is the product of the number of test stages and the longest staying time of each rotating speed step, and each rotating speed step containing time parameters is added to each group according to the set rotating speed step order and the required staying time of each rotating speed step;

[0063] A test stage splicing module is configured to extract one or more rotating speed steps corresponding to the nth longest staying time from each group in order to form the nth test stage;

[0064] The test module is used for high-cycle fatigue test according to each rotating speed step and time parameter of each rotating speed step contained in each test stage.

[0065] In some optional embodiments, the test stage number determining module comprises:

[0066] The rotating speed step parameter acquisition unit is used for acquiring rotating speed steps of a given high-cycle fatigue test and time required for each rotating speed step;

[0067] The total stay time calculation unit is used for determining total stay time of the test;

[0068] The test stage number calculation unit is used for determining test stage number by dividing the total stay time of the test by the longest time length of each test stage.

[0069] In some optional embodiments, the grouping construction module comprises:

[0070] The rotating speed sorting unit is used for sorting the rotating speed steps in ascending order according to rotating speed;

[0071] The rotating speed step sequence setting unit is used for sorting the rotating speed steps with odd numbers from low to high as the first half of the set rotating speed step sequence, and sorting the rotating speed steps with even numbers from high to low as the second half of the set rotating speed step sequence.

[0072] In some optional embodiments, the test module comprises a warm-up and cool-down step increasing unit, which is used for adding a warm-up step at the front of each test stage and adding a cool-down step at the rear of each test stage.

[0073] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any change or replacement within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining a high cycle fatigue test procedure for an aeroengine, characterized in that, The method comprises the following steps: S1, determining the number of test stages according to the total test time and the longest time of each test stage; S2, grouping the total test time, and adding each speed step containing time parameters into each group according to the set speed step sequence and the time required for each speed step; S3, extracting one or more speed steps corresponding to the nth longest time from each group in sequence to form the nth test stage; S4, performing high-cycle fatigue test according to the speed steps contained in each test stage and the time parameters of the speed steps.

2. The method of claim 1, wherein, S1 further comprises the following steps: S11, obtaining the speed steps of the given high-cycle fatigue test and the time required for each speed step; S12, determining the total test time; S13, determining the number of test stages by dividing the total test time by the longest time of each test stage.

3. The method of claim 1, wherein, Before S2, the method further comprises the following steps: S21, sorting the speed steps in ascending order according to the speed; S22, sorting the odd-numbered speed steps from low to high as the first half of the set speed step sequence, and sorting the even-numbered speed steps from high to low as the second half of the set speed step sequence.

4. The method of claim 1, wherein, S4 further comprises adding a warm-up step at the beginning of each test stage and a cold start step at the end of each test stage.

5. An aeroengine high cycle fatigue test program determination apparatus, characterized in that, The method comprises the following steps: A test stage number determination module is configured to determine the number of test stages according to the total test time and the longest time of each test stage; A grouping construction module is configured to group the total test time, and add each speed step containing time parameters into each group according to the set speed step sequence and the time required for each speed step; A test stage splicing module is configured to extract one or more speed steps corresponding to the nth longest time from each group in sequence to form the nth test stage; A test module is configured to perform high-cycle fatigue test according to the speed steps contained in each test stage and the time parameters of the speed steps.

6. The aeroengine high cycle fatigue test procedure determination apparatus of claim 5, wherein, The test stage number determination module comprises: A speed step parameter acquisition unit is configured to obtain the speed steps of the given high-cycle fatigue test and the time required for each speed step; A total test time calculation unit is configured to determine the total test time; A test stage number calculation unit is configured to determine the number of test stages by dividing the total test time by the longest time of each test stage.

7. The aircraft engine high cycle fatigue test procedure determination apparatus of claim 5, wherein, The grouping construction module comprises: A speed sorting unit is configured to sort the speed steps in ascending order according to the speed; A speed step sequence setting unit is configured to sort the odd-numbered speed steps from low to high as the first half of the set speed step sequence, and sort the even-numbered speed steps from high to low as the second half of the set speed step sequence.

8. The aircraft engine high cycle fatigue test procedure determination apparatus of claim 5, wherein, The test module comprises a warm-cold bench step increasing unit, which is configured to increase a warm-up step at the front of each test stage and a cold-down step at the rear of each test stage.

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