A method and apparatus for determining the high-cycle fatigue test procedure of an aero-engine

Abstract

This application belongs to the field of aero-engine fatigue testing technology, specifically relating to a method and apparatus for determining aero-engine high-cycle fatigue test procedure. The method includes: Step S1, determining the number of test stages based on the total test dwell time and the longest duration of each test stage; Step S2, grouping the total test dwell time, with the time for each group being the number of test stages multiplied by the longest dwell time for each speed step, and adding each speed step, including time parameters, to each group according to the set speed step sequence and the required dwell time for each speed step; Step S3, sequentially extracting one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test stage; Step S4, conducting high-cycle fatigue testing according to the speed steps included in each test stage and the time parameters for each speed step. This application can improve test efficiency and facilitate memorization and operation.

Description

Technical Field

[0001] This application belongs to the field of aero-engine fatigue testing technology, specifically relating to a method and apparatus for determining aero-engine high-cycle fatigue test procedures. Background Technology

[0002] During the development of aero engines, high-cycle fatigue tests are required to confirm whether the engine's resistance to high-cycle fatigue meets the requirements.

[0003] Currently, when conducting high-cycle fatigue testing, several types of test procedures are generally set up. Based on the test speed and dwell time determined by the strength specialist, these procedures are randomly arranged in batches and steps, and finally, the results are statistically analyzed to confirm whether the requirements are met. This method of determining test procedures is not only time-consuming and labor-intensive, but also inconvenient to operate and remember because the test time may not be a whole minute and the number of stages in various test procedures may differ. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a method and apparatus for determining the high-cycle fatigue test procedure for aero-engines.

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

[0006] Step S1: Determine the number of test stages based on the total test dwell time and the maximum duration of each test stage;

[0007] Step S2: Group the total test run dwell time. The time of each group is the number of test run stages multiplied by the maximum dwell time of each speed step. According to the set speed step sequence and the required dwell time of each speed step, add each speed step containing the time parameter to each group.

[0008] Step S3: Sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test stage;

[0009] Step S4: Conduct high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase.

[0010] Preferably, step S1 further includes:

[0011] Step S11: Obtain the given high-cycle fatigue test speed steps and the dwell time required for each speed step;

[0012] Step S12: Determine the total test run dwell time;

[0013] Step S13: Divide the total test drive dwell time by the maximum duration of each test stage to determine the number of test stages.

[0014] Preferably, step S2 further includes:

[0015] Step S21: Sort the speed steps in ascending order according to the speed;

[0016] Step S22: 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.

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

[0018] The second aspect of this application provides a device for determining the high-cycle fatigue test procedure of an aero-engine, mainly comprising:

[0019] The test phase number determination module is used to determine the number of test phases based on the total test dwell time and the maximum duration of each test phase.

[0020] The grouping module is used to group the total dwell time of the test run. The time of each group is the number of test run stages multiplied by the maximum dwell time of each speed step. According to the set speed step order and the required dwell time of each speed step, each speed step containing time parameters is added to each group.

[0021] The test run phase splicing module is used to sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test run phase;

[0022] The test module is used to perform high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase.

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

[0024] The speed step parameter acquisition unit is used to acquire the given speed step of the high-cycle fatigue test and the dwell time required for each speed step.

[0025] The total dwell time calculation unit is used to determine the total dwell time during the test run;

[0026] The test phase calculation unit is used to determine the number of test phases by dividing the total test dwell time by the maximum duration of each test phase.

[0027] Preferably, the grouping construction module includes:

[0028] The rotational speed sorting unit is used to sort the rotational speed steps in ascending order according to the rotational speed.

[0029] The speed step sequence setting unit is used 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.

[0030] Preferably, the test module includes a warm-up and cold-down step addition unit, used to add a warm-up step at the beginning of each test phase and a cold-down step at the end of each test phase.

[0031] This application can improve test drive efficiency and facilitate memorization and operation. Attached Figure Description

[0032] Figure 1 This is a flowchart of a preferred embodiment of the method for determining the high-cycle fatigue test procedure for aero-engines in this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] The first aspect of this application provides a method for determining the high-cycle fatigue test procedure for an aero-engine, such as... Figure 1 As shown, it mainly includes:

[0035] Step S1: Determine the number of test stages based on the total test dwell time and the maximum duration of each test stage.

[0036] In some alternative implementations, step S1 further includes:

[0037] Step S11: Obtain the given high-cycle fatigue test speed steps and the dwell time required for each speed step;

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

[0039] Step S13: Divide the total test drive dwell time by the maximum duration of each test stage to determine the number of test stages.

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

[0041] Then, in step S12, the required dwell time for all the speed steps above is calculated to obtain the total dwell time t2 of the test run.

[0042] Next, in step S13, based on prior test-run experience (the longest test-run time that can guarantee no failures) and the reliable working time of personnel / equipment on the test bench, the maximum test duration t3 for each stage is determined. t3 is generally 1 to 3 hours; too long may lead to the failure of the engine / equipment to be detected in time, while too short will reduce test-run efficiency (relevant checks and restarting engine warm-up / cold-down are required after each shutdown). Therefore, the number of test stages N is determined based on t2 / t3. That is, the entire test requires starting and stopping the engine N times to cover the engine fatigue test process at various speeds.

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

[0044] Step S2: Group the total test run dwell time. The time for each group is the number of test run stages multiplied by the maximum dwell time for each speed step. According to the set speed step sequence and the required dwell time for each speed step, add each speed step containing the time parameter to each group.

[0045] First, based on previous test experience, the maximum dwell time t4 for each speed step is determined. t4 is determined based on the test results of components or the maximum dwell time of other tests. For example, in a test phase, each speed step is only allowed to stay for a maximum of 5 minutes, i.e., t4 = 5 minutes. This needs to be distinguished from the dwell time t1(i) required at each speed step. As mentioned earlier, the dwell time required at 80% of the speed steps is t1(1) = 20 minutes, i.e., 20 minutes is required for 80% of the speed steps. However, in a test phase, only 5 minutes is allowed. That is, at least four test phases are required to fully meet the above assessment requirements.

[0046] In step S2, the concept of grouping is introduced. The duration of a group is N*t4. For example, if N=5 and t4=5min, then the duration of a group is 25 minutes.

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

[0048] Then the 20 minutes of t1(1) are all merged into the first group, the first 5 minutes of t1(2) are merged into the first group, together forming a 25-minute group, the last 25 minutes of t1(2) are merged into the second group, and the 25 minutes of t1(3) are merged into the third group.

[0049] In some alternative implementations, step S2 is further preceded by:

[0050] Step S21: Sort the speed steps in ascending order according to the speed;

[0051] Step S22: 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.

[0052] This embodiment provides a preferred embodiment for constructing a predetermined speed step sequence, for example, constructing the speed step sequence according to 80%, 82%, 84%, 86%...100%, 99%, 97%...83%, 81%. This ensures that the engine state is assessed more fully, and both ascending and descending speed steps are evaluated.

[0053] Step S3: Sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test stage;

[0054] Using the previous example, when n=1, the speed step corresponding to the first 5 minutes is extracted from the first group (80%), the speed step corresponding to the first 5 minutes is extracted from the second group (81%), the speed step corresponding to the first 5 minutes is extracted from the third group (82%), and so on, to form the first test phase. Similarly, when n=2, the speed step corresponding to the second 5 minutes is extracted from the first group (80%), the speed step corresponding to the second 5 minutes is extracted from the second group (81%), the speed step corresponding to the second 5 minutes is extracted from the third group (82%), and so on, to form the second test phase.

[0055] Step S4: Conduct high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase.

[0056] In some alternative implementations, step S4 further includes adding a warm-up step at the beginning of each test phase and a cold-up step at the end of each test phase.

[0057] In this embodiment, necessary "warm-up" and "cold-down" steps are added before and after the test run. In each stage of the high-cycle fatigue test, one or more speeds in each group are selected for a pause (when the remaining time for each speed test is less than t4). The maximum pause time for each group is t4, which completes the determination of the high-cycle fatigue test run program.

[0058] It should also be noted that, since there may be overlap in speeds between groups, the same speed step needs to be interspersed during testing. For example, in the aforementioned embodiment, when n=5, the speed steps extracted from the first and second groups are both 81%. Therefore, other speed steps can be added between these two identical speed steps. Because the speed may fluctuate, the test results need to be statistically analyzed every one or several test days, and completed test steps should be deleted as soon as possible to avoid excessive testing and wasting test time.

[0059] This application can greatly improve the efficiency of high-cycle fatigue testing (minimize downtime and reduce unnecessary warm-up and cold-up time), and facilitate the memorization and operation of the program by the test personnel (fixed time for each step, less throttle operation). The compiled high-cycle fatigue testing program can be flexibly arranged according to the test time (simply reduce it proportionally), which can meet the needs of flexible test bench scheduling.

[0060] The second aspect of this application provides an apparatus for determining the high-cycle fatigue test procedure of an aero-engine, corresponding to the above-described method, mainly comprising:

[0061] The test phase number determination module is used to determine the number of test phases based on the total test dwell time and the maximum duration of each test phase.

[0062] The grouping module is used to group the total dwell time of the test run. The time of each group is the number of test run stages multiplied by the maximum dwell time of each speed step. According to the set speed step order and the required dwell time of each speed step, each speed step containing time parameters is added to each group.

[0063] The test run phase splicing module is used to sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test run phase;

[0064] The test module is used to perform high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase.

[0065] In some optional implementations, the test phase number determination module includes:

[0066] The speed step parameter acquisition unit is used to acquire the given speed step of the high-cycle fatigue test and the dwell time required for each speed step.

[0067] The total dwell time calculation unit is used to determine the total dwell time during the test run;

[0068] The test phase calculation unit is used to determine the number of test phases by dividing the total test dwell time by the maximum duration of each test phase.

[0069] In some alternative implementations, the grouping construction module includes:

[0070] The rotational speed sorting unit is used to sort the rotational speed steps in ascending order according to the rotational speed.

[0071] The speed step sequence setting unit is used 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.

[0072] In some alternative implementations, the test module includes a warm-up and cold-down step addition unit, used to add a warm-up step at the beginning of each test phase and a cold-down step at the end of each test phase.

[0073] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for determining a high cycle fatigue test procedure for an aeroengine, characterized in that, include: Step S1: Determine the number of test stages based on the total test dwell time and the maximum duration of each test stage; Step S2: Group the total test run dwell time. The time of each group is the number of test run stages multiplied by the maximum dwell time of each speed step. According to the set speed step sequence and the required dwell time of each speed step, add each speed step containing the time parameter to each group. Step S3: Sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test stage; Step S4: Conduct high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase. Step S1 further includes: Step S11: Obtain the given high-cycle fatigue test speed steps and the dwell time required for each speed step; Step S12: Determine the total test run dwell time; Step S13: Divide the total test drive dwell time by the maximum duration of each test stage to determine the number of test stages; Step S2 further includes: Step S21: Sort the speed steps in ascending order according to the speed; Step S22: 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.

2. The method for determining the high-cycle fatigue test procedure for aero-engines as described in claim 1, characterized in that, Step S4 further includes adding a warm-up step at the beginning of each test phase and a cold-up step at the end of each test phase.

3. A device for determining the high-cycle fatigue test procedure of an aero-engine, characterized in that, include: The test phase number determination module is used to determine the number of test phases based on the total test dwell time and the maximum duration of each test phase. The grouping module is used to group the total test dwell time. The time of each group is the number of test stages multiplied by the maximum dwell time of each speed step. According to the set speed step order and the required dwell time of each speed step, each speed step containing time parameters is added to each group. The test run phase splicing module is used to sequentially extract one or more speed steps corresponding to the nth longest dwell time from each group to form the nth test run phase; The test module is used to perform high-cycle fatigue testing according to the speed steps and time parameters of each speed step included in each test phase. The module for determining the number of test phases includes: The speed step parameter acquisition unit is used to acquire the given speed step of the high-cycle fatigue test and the dwell time required for each speed step. The total dwell time calculation unit is used to determine the total dwell time during the test run; The test phase calculation unit is used to divide the total test dwell time by the maximum duration of each test phase to determine the number of test phases; The grouping construction module includes: The rotational speed sorting unit is used to sort the rotational speed steps in ascending order according to the rotational speed. The speed step sequence setting unit is used 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.

4. The aero-engine high-cycle fatigue test procedure determination device as described in claim 3, characterized in that, The test module includes a warm-up and cold-down step addition unit, which is used to add a warm-up step at the beginning of each test phase and a cold-down step at the end of each test phase.

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