A time synchronization method based on an acoustic emission system and a test system
By determining the working time in the acoustic emission system and the strain acquisition system, the time correspondence between the acoustic emission data and the loading working condition is established, the problem that the acoustic emission system and the test system cannot be synchronized in the fatigue test of the aircraft is solved, and the reliability of damage recognition and positioning accuracy are improved.
Patent Information
- Application Number
- CN202111667023.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-31
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2041-12-31
AI Technical Summary
In the aircraft's full-air fatigue test, the acoustic emission system and the test system cannot be synchronized, resulting in the inability to establish the time correspondence between the acoustic emission data and the loading condition, and it is difficult to accurately locate the time period of damage recorded in the acoustic emission system.
By determining the time of the first working condition and the last working condition of the day in the acoustic emission system and the strain acquisition system, and calculating the exact time of each working condition based on these time points, the time correspondence between the acoustic emission data and the loading working condition is established.
The acoustic emission data corresponds to the test loading conditions one by one, and improves the reliability of the damage identification method and the positioning accuracy of the damage occurrence period.
Smart Images
Figure CN114487127B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of aircraft strength testing, and particularly relates to a time synchronization method based on an acoustic emission system and a test system. Background Art
[0002] In the full-aircraft fatigue test of an aircraft, since the acoustic emission system and the test system cannot be synchronized (the strain acquisition system is synchronized with the test system), the time correspondence relationship between the acoustic emission data and the loading conditions cannot be established. Therefore, it is difficult to solve the problem of accurately corresponding the acoustic emission data with the loading conditions, and it is impossible to accurately locate the time period in the test system when the damage recorded in the acoustic emission system occurs. Summary of the Invention
[0003] To solve at least one technical problem existing in the prior art, this application provides a time synchronization method based on an acoustic emission system and a test system.
[0004] This application discloses a time synchronization method based on an acoustic emission system and a test system, including the following steps:
[0005] Step 1: In the acoustic emission system, determine the time of the first working condition and the time of the last working condition on the same day;
[0006] Step 2: In the strain acquisition system, find the time of the first working condition and the time of the last working condition on the same day;
[0007] Step 3: According to the corresponding relationship in Step 1 and Step 2, calculate the accurate time of each working condition in the acoustic emission system.
[0008] According to at least one embodiment of this application, Step 1 specifically includes the following sub-steps:
[0009] Step 1.1: In the acoustic emission system, according to the load spectrum and time waveform information recorded in the acoustic emission data, determine the first flight and the last flight on the same day;
[0010] Step 1.2: Determine the time of the first working condition from the first flight;
[0011] Step 1.3: Determine the time of the last working condition from the last flight.
[0012] According to at least one embodiment of this application, Step 2 specifically includes the following sub-steps:
[0013] Step 2.1: In the strain acquisition system, according to the strain acquisition data, find the first flight and the last flight on the same day;
[0014] Step 2.2: Find the time of the first working condition from the first flight;
[0015] Step 2.3: Find the time of the last working condition from the last lift.
[0016] According to at least one embodiment of the present application, in the said step three, the corresponding relationship between step one and step two is determined according to the following formula (1):
[0017]
[0018] Wherein, t is the time of a certain working condition in the acoustic emission system, that is, the accurate time of each working condition in the acoustic emission system; t1 and t2 are respectively the time of the first working condition and the last working condition of the day in the acoustic emission system; t1' and t2' are respectively the time of the first working condition and the last working condition of the day in the strain acquisition system; t' is the time of a certain working condition in the strain acquisition data in the strain acquisition system.
[0019] The present application has at least the following beneficial technical effects:
[0020] The time synchronization method of the present application based on the acoustic emission system and the test system breaks through the current situation that the time of the acoustic emission system and the time of the test system cannot be synchronized in the full-aircraft fatigue test of the aircraft, establishes the time corresponding relationship between the acoustic emission data and the loading working condition, realizes the one-to-one correspondence between the acoustic emission data and the test loading working condition, and thus greatly improves the reliability of the damage identification method based on the acoustic emission system and the positioning accuracy of the damage occurrence time period. Description of the Drawings
[0021] Figure 1 is the flowchart of the time synchronization method of the present application based on the acoustic emission system and the test system;
[0022] Figure 2 is Figure 1 the specific sub-steps of step one in
[0023] Figure 3 is Figure 1 the specific sub-steps of step two in
[0024] Figure 4 is Figure 2 and Figure 3 the data table diagram used in Specific Embodiments
[0025] To make the purpose, technical solutions, and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, rather than being construed as a limitation of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.
[0026] The following will further describe in detail the time synchronization method of the present application based on the acoustic emission system and the test system with reference to the attached Figures 1-4 drawings.
[0027] The present application discloses a time synchronization method based on an acoustic emission system and a test system, including the following steps:
[0028] Step 1: In the acoustic emission system, determine the time of the first working condition and the time of the last working condition of the day.
[0029] Specifically, in this embodiment, as Figure 2 shown, this Step 1 specifically includes the following sub-steps:
[0030] Step 1.1: In the acoustic emission system, according to the load spectrum and time waveform information recorded in the acoustic emission data, determine the first and last cycles of the day, that is, Figure 4 the second row in column A and the seventeenth row in column A in
[0031] Step 1.2: Determine the time of the first working condition from the first cycle, that is, Figure 4 the second row in column C in
[0032] Step 1.3: Determine the time of the last working condition from the last cycle, that is, Figure 4 the seventeenth row in column C in
[0033] Step 2: In the strain acquisition system, find the time of the first working condition and the time of the last working condition of the day.
[0034] Similarly, in this embodiment, as Figure 3 shown, this Step 2 specifically includes the following sub-steps:
[0035] Step 2.1: In the strain acquisition system, according to the strain acquisition data, find the first and last cycles of the day, that is, Figure 4 the second row in column A and the seventeenth row in column A in
[0036] Step 2.2: Find the time of the first working condition from the first cycle, that is, Figure 4Row 2, Column D in
[0037] Step 2.3: Find the time of the last working condition from the last lift; that is Figure 4 Row 17, Column D in
[0038] It should be noted that the time of the strain acquisition system is data in an excel spreadsheet, which is automatically recorded during the test. Therefore, when the start and end times are determined according to the acoustic emission system (i.e., the times determined in Steps 2.2 and 2.3), the times of other working conditions on the same day are automatically obtained, that is Figure 4 Rows 3 to 16, Column D in
[0039] Step Three: Calculate the accurate time of each working condition in the acoustic emission system according to the corresponding relationship between Step One and Step Two.
[0040] Specifically, in this embodiment, the corresponding relationship between Step One and Step Two is determined according to the following formula (1):
[0041]
[0042] Where t is the time of a certain working condition in the acoustic emission system, that is, the accurate time of each working condition in the acoustic emission system; t1 and t2 are respectively the time of the first working condition and the last working condition on the same day in the acoustic emission system; t1' and t2' are respectively the time of the first working condition and the last working condition on the same day in the strain acquisition system; t' is the time of a certain working condition in the strain acquisition data in the strain acquisition system.
[0043] In summary, the time synchronization method based on the acoustic emission system and the test system of the present application breaks through the current situation that the time of the acoustic emission system and the test system cannot be synchronized in the full-aircraft fatigue test of an aircraft, establishes the time correspondence relationship between the acoustic emission data and the loading working conditions, realizes the one-to-one correspondence between the acoustic emission data and the test loading working conditions, and thus greatly improves the reliability of the damage identification method based on the acoustic emission system and the positioning accuracy of the damage occurrence time period.
[0044] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.
Claims
1. A time synchronization method based on an acoustic emission system and a test system, characterized in that, It includes the following steps: Step 1: In the acoustic emission system, determine the time of the first working condition and the time of the last working condition on the same day; Step 2: In the strain acquisition system, find the time of the first working condition and the time of the last working condition on the same day; Step 3: According to the corresponding relationship between Step 1 and Step 2, calculate the accurate time of each working condition in the acoustic emission system; The specific steps of Step 1 include the following sub-steps: Step 1.1: In the acoustic emission system, according to the load spectrum and time waveform information recorded in the acoustic emission data, determine the first lift-off and the last lift-off on the same day; Step 1.2: Determine the time of the first working condition from the first lift-off; Step 1.3: Determine the time of the last working condition from the last lift-off; The specific steps of Step 2 include the following sub-steps: Step 2.1: In the strain acquisition system, find the first lift-off and the last lift-off on the same day according to the strain acquisition data; Step 2.2: Find the time of the first working condition from the first lift-off; Step 2.3: Find the time of the last working condition from the last lift-off; In Step 3, the corresponding relationship between Step 1 and Step 2 is determined according to the following formula (1): Where, t is the time of a certain working condition in the acoustic emission system, that is, the accurate time of each working condition in the acoustic emission system; t1 and t2 are respectively the time of the first working condition and the time of the last working condition on the same day in the acoustic emission system; t1' and t2' are respectively the time of the first working condition and the time of the last working condition on the same day in the strain acquisition system; t' is the time of a certain working condition in the strain acquisition data in the strain acquisition system.