Vibration Fatigue Load Spectrum Compilation Method and Device

Abstract

The present invention relates to the technical field of rail vehicles, and provides a method and device for compiling a vibration fatigue load spectrum. The method includes: obtaining a vibration acceleration time-domain load obtained based on a line test; determining the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration; compiling an effective value frequency spectrum of the vibration acceleration load according to the effective value distribution; compiling a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration; inputting the multi-level acceleration functional load spectrum into a bench test to obtain fatigue damage corresponding to the multi-level acceleration functional load spectrum over the entire design life mileage; calculating a vibration acceleration coefficient according to the fatigue damage; and compiling an acceleration long-life load spectrum according to the acceleration functional load spectrum and the vibration acceleration coefficient. The fatigue damage of the hanging structure calculated by using the acceleration long-life load spectrum compiled by the present invention is basically consistent with the actual damage of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and particularly to a method and device for compiling a vibration fatigue load spectrum. Background Art

[0002] With the rapid development of rail transit, the operating speed of trains has been continuously increasing, the line conditions have been deteriorating, and the vibration loads borne by rail vehicles have been continuously increasing, especially having a more serious impact on some components under the spring. At present, the random vibration fatigue test method for the hanging components of rail vehicles mainly refers to the standard IEC 61373. There are often large differences between the vibration loads specified in the standard and the line loads of rail vehicles, resulting in the calculation results of the fatigue damage of the hanging structure deviating from the actual damage of the structure. Summary of the Invention

[0003] The present invention provides a method and device for compiling a vibration fatigue load spectrum to solve the problem that there are often large differences between the vibration loads specified in the prior art and the line loads of rail vehicles, resulting in the calculation results of the fatigue damage of the hanging structure deviating from the actual damage of the structure.

[0004] The present invention provides a method for compiling a vibration fatigue load spectrum, including:

[0005] Obtaining the vibration acceleration time-domain load obtained based on the line test;

[0006] Determining the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration;

[0007] Compiling an effective value frequency spectrum of the vibration acceleration load according to the effective value distribution;

[0008] Compiling a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration;

[0009] Inputting the multi-level acceleration functional load spectrum into a bench test to obtain the fatigue damage corresponding to the multi-level acceleration functional load spectrum over the entire design life mileage;

[0010] Calculating the vibration acceleration coefficient according to the fatigue damage;

[0011] Compiling an acceleration long-life load spectrum according to the multi-level acceleration functional load spectrum and the vibration acceleration coefficient.

[0012] According to the method for compiling a vibration fatigue load spectrum provided by the present invention, after obtaining the vibration acceleration time-domain load obtained based on the line test, it further includes: determining the vibration acceleration load spectrum type according to the vibration acceleration time-domain load,

[0013] After determining the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration, the following steps are further included:

[0014] Determine the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type.

[0015] The step of compiling the effective value frequency spectrum of the vibration acceleration load according to the effective value distribution includes:

[0016] Compile the effective value frequency spectrum of the vibration acceleration load according to the part in the effective value distribution of the vibration acceleration load that is greater than or equal to the critical effective value.

[0017] According to a vibration fatigue load spectrum compilation method provided by the present invention, determining the vibration acceleration load spectrum type according to the vibration acceleration time-domain load includes:

[0018] Perform Fourier transform on the vibration acceleration time-domain load to obtain the vibration acceleration power spectral density.

[0019] Perform envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type.

[0020] According to a vibration fatigue load spectrum compilation method provided by the present invention, compiling a multi-level acceleration function load spectrum according to the effective value frequency spectrum and the sample duration includes:

[0021] Divide the effective values in the effective value frequency spectrum into multiple levels according to preset effective value grading points, and select a target effective value for each level.

[0022] Determine the spectrum type corresponding to the target effective value of each level as the acceleration function load spectrum of that level, where the sum of the sample durations corresponding to all the effective values of each level is the action time corresponding to that level.

[0023] According to a vibration fatigue load spectrum compilation method provided by the present invention, the multi-level acceleration function load spectrum is a three-level acceleration function load spectrum.

[0024] According to a vibration fatigue load spectrum compilation method provided by the present invention, inputting the multi-level acceleration function load spectrum into a bench test to obtain the fatigue damage corresponding to the multi-level acceleration function load spectrum under the entire design life mileage includes:

[0025] Input the multi-level acceleration function load spectrum into a bench test, determine the fatigue damage under the action of each level of acceleration function load spectrum, and obtain the fatigue damage under a cyclic function load spectrum.

[0026] Determine the fatigue damage under the entire design life mileage according to the line test operation mileage, the vehicle design life mileage, and the fatigue damage under the cyclic function load spectrum.

[0027] A method for compiling a vibration fatigue load spectrum provided by the present invention calculates a vibration acceleration coefficient according to the fatigue damage, including: calculating a vibration acceleration coefficient k according to the following formula:

[0028]

[0029] where D ′ is the fatigue damage under the cyclic functional load spectrum, D is the fatigue damage under the entire life mileage, and m is a parameter in the fatigue curve of the vibrating part.

[0030] The present invention also provides a device for compiling a vibration fatigue load spectrum, including:

[0031] A time-domain load acquisition module for acquiring a vibration acceleration time-domain load obtained based on a line test;

[0032] An effective value distribution determination module for determining the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration;

[0033] A frequency spectrum compilation module for compiling an effective value frequency spectrum of the vibration acceleration load according to the effective value distribution;

[0034] A functional load spectrum compilation module for compiling a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration;

[0035] A fatigue damage acquisition module for inputting the multi-level acceleration functional load spectrum into a bench test to obtain the fatigue damage corresponding to the multi-level acceleration functional load spectrum under the entire design life mileage;

[0036] An acceleration coefficient calculation module for calculating a vibration acceleration coefficient according to the fatigue damage;

[0037] A long-life load spectrum compilation module for compiling an acceleration long-life load spectrum according to the multi-level acceleration functional load spectrum and the vibration acceleration coefficient.

[0038] A device for compiling a vibration fatigue load spectrum provided by the present invention further includes:

[0039] A load spectrum type determination module for determining the vibration acceleration load spectrum type according to the vibration acceleration time-domain load,

[0040] A critical effective value determination module for determining the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type,

[0041] The frequency spectrum compilation module is specifically configured to compile the effective value frequency spectrum of the vibration acceleration load according to the part of the effective value distribution of the vibration acceleration load that is greater than or equal to the critical effective value.

[0042] According to a vibration fatigue load spectrum compilation device provided by the present invention, the load spectrum type determination module is specifically configured to perform Fourier transform on the vibration acceleration time-domain load to obtain the vibration acceleration power spectral density; perform envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type.

[0043] The vibration fatigue load spectrum compilation method and device provided by the present invention, based on the vibration acceleration time-domain load measured on the line, compile the vibration acceleration functional load spectrum of the track vehicle hanging structure, can simulate the actual operation of the vehicle, and obtain the long-life acceleration load spectrum based on the fatigue damage consistency theory, so that the fatigue damage of the hanging structure calculated according to the long-life acceleration load spectrum is basically consistent with the actual damage of the structure. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic flow chart of the vibration fatigue load spectrum compilation method provided by the present invention;

[0046] Figure 2 is a schematic diagram of envelope processing of the vibration acceleration power spectral density in the vibration fatigue load spectrum compilation method provided by the present invention;

[0047] Figure 3 is a schematic structural diagram of the vibration fatigue load spectrum compilation device provided by the present invention. Detailed Embodiments

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0049] The vibration fatigue load spectrum compilation method of the embodiments of the present invention is as Figure 1 shown and includes:

[0050] Step S110: Obtain the vibration acceleration time-domain load obtained from the line test. In this step, for the hanging structure of the rail vehicle, the vibration acceleration time-domain load of the hanging structure of the rail vehicle is obtained through the line test. That is, by making full use of the acceleration data of the line test, the utilization rate of the line data is improved. Based on the actually measured vibration acceleration time-domain load on the line, an acceleration load spectrum is compiled to simulate the actual service environment, and the evaluation result is more accurate. Specifically, when the rail vehicle is running forward, the vibration acceleration information is sensed by the acceleration sensor installed on the hanging structure to obtain the vibration acceleration time-domain load.

[0051] Step S120: Calculate the effective value of the vibration acceleration within the preset sample duration to determine the effective value distribution of the vibration acceleration time-domain load, where the effective value is the root mean square value of the vibration acceleration within the sample duration. For example: the entire time-domain length is 100 s, the sample duration is 1 s, and the root mean square value of the vibration acceleration within each 1 s is the effective value. In this way, 100 effective values can be obtained, and the distribution of the 100 effective values is the effective value distribution of the vibration acceleration time-domain load.

[0052] Step S130: Compile the effective value frequency spectrum of the vibration acceleration time-domain load according to the effective value distribution. Specifically, the effective values are sorted in ascending order, and the number of times of the same effective value is counted to form the effective value frequency spectrum.

[0053] Step S140: Compile a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration. Each level of the acceleration functional load spectrum contains the effective value of the acceleration load and the corresponding action time. Specifically, the effective values in the effective value frequency spectrum are divided into multiple levels according to the preset effective value grading points. For each level, a target effective value is selected (the target effective value can be the average value of all effective values in each level). The spectrum type corresponding to each level of the target effective value is determined as the acceleration functional load spectrum of that level. Among them, the sum of the sample durations corresponding to all the effective values in each level is the action time corresponding to that level. Taking the example of dividing into three levels, there are 15 samples, and the effective values corresponding to each sample are 0.2, 0.4, 0.4, 0.5, 0.7, 0.7, 0.9, 1.1, 1.3, 1.6, 1.7, 1.9, 2.3, 2.6, 2.8 respectively. They are divided into three levels in ascending order, and the effective value grading points are 1 and 2 respectively, and the three intervals are: [0, 1), [1, 2), and [2, 3).

[0054] The number of samples in the 0-1 interval is 7, and the interval target effective value is 0.5, that is, the frequency of the effective value 0.5 appearing during the subsequent bench test is 7, and each sample duration is 1 s, and the action time corresponding to this level is 7 s.

[0055] The number of samples in the 1 - 2 interval is 5, and the target effective value of the interval is 1.5, that is, the frequency of the effective value of 1.5 in the subsequent bench test is 5. The duration of each sample is 1 s, and the corresponding action time of this level is 5 s.

[0056] The number of samples in the 2 - 3 interval is 3, and the target effective value of the interval is 2.5, that is, the frequency of the effective value of 2.5 in the subsequent bench test is 3. The duration of each sample is 1 s, and the corresponding action time of this level is 3 s.

[0057] The multi - level acceleration functional load spectrum is formed by the spectrum type corresponding to the effective value of 0.5 lasting for 7 s, the spectrum type corresponding to the effective value of 1.5 lasting for 5 s, and the spectrum type corresponding to the effective value of 2.5 lasting for 3 s.

[0058] Step S150: Input the multi - level acceleration functional load spectrum into the bench test to obtain the fatigue damage corresponding to the multi - level acceleration functional load spectrum under the entire design life mileage.

[0059] Step S160: Calculate the vibration acceleration coefficient according to the fatigue damage.

[0060] Step S170: Compile the long - life acceleration load spectrum according to the multi - level acceleration functional load spectrum and the vibration acceleration coefficient. Among them, the long - life acceleration load spectrum is the vibration fatigue load spectrum under the entire design life mileage.

[0061] The method for compiling the vibration fatigue load spectrum in this embodiment, based on the vibration acceleration time - domain load measured on the line, compiles the vibration acceleration functional load spectrum of the hanging structure of the rail vehicle, can simulate the actual operation of the vehicle, and obtains the long - life acceleration load spectrum based on the fatigue damage consistency theory, so that the fatigue damage of the hanging structure calculated according to the long - life acceleration load spectrum is basically consistent with the actual damage of the structure.

[0062] Furthermore, in the method for compiling the vibration fatigue load spectrum of this embodiment, after step S110, it further includes: determining the vibration acceleration load spectrum type according to the vibration acceleration time - domain load. Specifically, performing Fourier transform on the vibration acceleration time - domain load to obtain the vibration acceleration power spectral density; performing envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type. As Figure 2 shown, the envelope processing is the process of connecting the maximum value points in the vibration acceleration power spectral density to form an envelope line. Using the envelope method to correct the vibration acceleration power spectral density, the determined acceleration load spectrum type after correction has a simple form and is easy to load, improving the efficiency of the bench test.

[0063] On this basis, after step S120, it further includes: determining the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type. Specifically, according to the structural fatigue fracture theory, during the actual service of the vehicle, when the structural stress is lower than the fatigue limit value, the structure will not produce fatigue damage. Based on this fatigue theory, the corresponding fatigue limit value is determined through the S-N curve of the suspension structure of the rail vehicle, and at the same time, a bench test is carried out in combination with the acceleration load spectrum type to determine the critical effective value of the vibration acceleration load.

[0064] Furthermore, step S130 specifically includes: compiling the effective value frequency spectrum of the vibration acceleration load according to the part greater than or equal to the critical effective value in the effective value distribution of the vibration acceleration load, so as to ignore the influence of low-amplitude loads on the structural fatigue damage, shorten the subsequent bench test cycle, improve the test efficiency, and reduce the test cost.

[0065] In step S140, the multi-level acceleration function load spectrum is a three-level acceleration function load spectrum. The three-level acceleration function load spectrum is compiled according to the effective value frequency spectrum and the sample duration. Each level of the acceleration function load spectrum includes the effective value of the acceleration load and its corresponding action time. Compiling the three-level acceleration spectrum fully considers the load amplitude and vibration energy distribution characteristics of the suspension structure, and the test results are closer to the actual situation of the structure.

[0066] In this embodiment, step S150 includes:

[0067] Inputting the multi-level acceleration function load spectrum into the bench test, determining the fatigue damage under the action of each level of acceleration function load spectrum, and obtaining the fatigue damage D under a cyclic function load spectrum ′ . The cyclic function load spectrum is a spectrum type in which each level is loaded into the bench test according to its respective time slice. For example: there are 10 samples with a target effective value of 0.5, 30 samples with a target effective value of 1.5, and 60 samples with a target effective value of 2.5, and the sample duration is 1 s for all. Then the period of the cyclic function load spectrum can be 10 s and it cycles 10 times. Within these 10 s, the spectrum type corresponding to the target effective value of 0.5 is 1 s, the spectrum type corresponding to the target effective value of 1.5 is 3 s, and the spectrum type corresponding to the target effective value of 2.5 is 6 s. The cyclic loading of each level of load eliminates the influence of the loading order of different vibration energies on the structural fatigue damage, making the method of this embodiment have high universality and reliability.

[0068] Specifically, the fatigue damages under the action of the first, second, and third level acceleration function load spectra are D1, D2, and D3 respectively, and their calculation formulas are as follows:

[0069]

[0070] D ′= D1 + D2 + D3

[0071] where, D j is the fatigue damage under the action of the j-th level acceleration functional load spectrum, and D ′ is the sum of the fatigue damages under the action of each level of acceleration functional load spectrum, that is, the fatigue damage under the cyclic functional load spectrum. In the case of three levels, j = 1, 2, 3, σ i and n i are respectively the i-th level stress amplitude and the number of cycles in the corresponding stress amplitude spectrum when the j-th level acceleration functional load spectrum acts (for example: n i = 10). C and m are the relevant parameters of the S-N curve (fatigue curve) of the vibrating part (hanging structure). Among them, C is a constant, and m takes the value of 3.5.

[0072] According to the operating mileage L1 of the line test and the design life mileage L of the vehicle, and the fatigue damage under the cyclic functional load spectrum, the fatigue damage D under the entire design life mileage L is determined. The specific calculation formula for the fatigue damage D is as follows:

[0073]

[0074] where, for the hanging structure of the rail vehicle, D represents the fatigue damage of the hanging structure of the rail vehicle under the entire life mileage.

[0075] In this embodiment, in step S160, the vibration acceleration coefficient k is calculated according to the following formula:

[0076]

[0077] where, D ′ is the fatigue damage under the cyclic functional load spectrum, and D is the fatigue damage under the entire design life mileage. In step S170, the multi-level acceleration functional load spectrum is multiplied by the vibration acceleration coefficient k to obtain the acceleration long-life load spectrum.

[0078] In this embodiment, by combining the bench functional test and the structural design life mileage to determine the acceleration coefficients and action times of each level of load spectrum, cyclic loading of each level of load can be realized, eliminating the influence of the loading order of different vibration energies on the structural fatigue damage. This method has high universality and reliability.

[0079] It should be noted that: The method of this embodiment is not limited to the compilation of the vibration fatigue load spectrum of the hanging structure of rail vehicles, and is suitable for the compilation of the vibration fatigue load spectrum of the hanging structures of all vehicles.

[0080] Next, the vibration fatigue load spectrum compilation device provided by the present invention is described. The vibration fatigue load spectrum compilation device described below can be mutually corresponding and referred to with the vibration fatigue load spectrum compilation method described above.

[0081] As shown in Figure 3 the vibration fatigue load spectrum compiling device provided by the present invention includes:

[0082] A time-domain load acquisition module 310, configured to acquire the vibration acceleration time-domain load obtained based on line tests.

[0083] An effective value distribution determination module 320, configured to determine the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration.

[0084] A frequency spectrum compiling module 330, configured to compile an effective value frequency spectrum of the vibration acceleration load according to the effective value distribution.

[0085] A functional load spectrum compiling module 340, configured to compile a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration.

[0086] A fatigue damage acquisition module 350, configured to input the multi-level acceleration functional load spectrum into a bench test to acquire the fatigue damage corresponding to the multi-level acceleration functional load spectrum under the entire design life mileage.

[0087] An acceleration coefficient calculation module 360, configured to calculate a vibration acceleration coefficient according to the fatigue damage.

[0088] A long-life load spectrum compiling module 370, configured to compile an acceleration long-life load spectrum according to the multi-level acceleration functional load spectrum and the vibration acceleration coefficient.

[0089] The vibration fatigue load spectrum compiling device of this embodiment, based on the vibration acceleration time-domain load measured on the line, compiles the vibration acceleration functional load spectrum of the suspension structure of the rail vehicle, can simulate the actual operation of the vehicle, and obtains the acceleration long-life load spectrum based on the fatigue damage consistency theory, so that the fatigue damage of the suspension structure calculated according to the acceleration long-life load spectrum is basically consistent with the actual damage of the structure.

[0090] Optionally, the vibration fatigue load spectrum compiling device of the present invention further includes:

[0091] A load spectrum type determination module, configured to determine the vibration acceleration load spectrum type according to the vibration acceleration time-domain load.

[0092] A critical effective value determination module, configured to determine the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type.

[0093] Based on the critical effective value of the determined vibration acceleration load, the frequency spectrum compilation module 330 is specifically configured to compile the effective value frequency spectrum of the vibration acceleration load according to the part of the effective value distribution of the vibration acceleration load that is greater than or equal to the critical effective value.

[0094] Optionally, the load spectrum type determination module is specifically configured to perform Fourier transform on the vibration acceleration time-domain load to obtain the vibration acceleration power spectral density; perform envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type.

[0095] Optionally, the functional load spectrum compilation module 340 is specifically configured to divide the effective values in the effective value frequency spectrum into multiple levels according to preset effective value grading points, and select a target effective value for each level; determine the spectrum type corresponding to each level of the target effective value as the acceleration functional load spectrum of that level, where the sum of the sample durations corresponding to all the effective values of each level is the action time corresponding to that level.

[0096] Optionally, the multi-level acceleration functional load spectrum is a three-level acceleration functional load spectrum.

[0097] Optionally, the fatigue damage acquisition module 350 is specifically configured to input the multi-level acceleration functional load spectrum into a bench test, determine the fatigue damage under the action of each level of acceleration functional load spectrum, and obtain the fatigue damage under a cyclic functional load spectrum; determine the fatigue damage under the entire design life mileage according to the line test operation mileage, the vehicle design life mileage, and the fatigue damage under the cyclic functional load spectrum.

[0098] Optionally, the acceleration coefficient calculation module 360 specifically calculates the vibration acceleration coefficient k according to the following formula:

[0099]

[0100] where D ′ is the fatigue damage under the cyclic functional load spectrum, D is the fatigue damage under the entire life mileage, and m is the parameter in the fatigue curve of the vibrating part.

[0101] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for compiling a vibration fatigue load spectrum, characterized in that Including: Obtain the vibration acceleration time-domain load obtained based on the line test; Determine the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration; Compile the effective value frequency spectrum of the vibration acceleration load according to the effective value distribution, sort the effective values in ascending order, and count the number of times of the same effective value to form the effective value frequency spectrum; Compile a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration, where each level of the acceleration functional load spectrum includes the effective value of the acceleration load and the corresponding action time; Input the multi-level acceleration functional load spectrum into the bench test to obtain the fatigue damage corresponding to the multi-level acceleration functional load spectrum under the entire design life mileage; Calculate the vibration acceleration coefficient according to the fatigue damage; Compile an acceleration long-life load spectrum according to the multi-level acceleration functional load spectrum and the vibration acceleration coefficient.

2. The method for compiling a vibration fatigue load spectrum according to claim 1, wherein After obtaining the vibration acceleration time-domain load obtained based on the line test, it further includes: determining the vibration acceleration load spectrum type according to the vibration acceleration time-domain load, After determining the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration, it further includes: Determine the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type, The compiling the effective value frequency spectrum of the vibration acceleration load according to the effective value distribution includes: Compile the effective value frequency spectrum of the vibration acceleration load according to the part of the effective value distribution of the vibration acceleration load that is greater than or equal to the critical effective value.

3. The method for compiling a vibration fatigue load spectrum according to claim 2, wherein Determining the vibration acceleration load spectrum type according to the vibration acceleration time-domain load includes: Perform Fourier transform on the vibration acceleration time-domain load to obtain the vibration acceleration power spectral density; Perform envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type.

4. The method for compiling a vibration fatigue load spectrum according to any one of claims 1 to 3, characterized in that, Compiling a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration includes: Divide the effective values in the effective value frequency spectrum into multiple levels according to a preset effective value grading point, and select a target effective value for each level; Determine the spectrum type corresponding to each level of target effective value as the acceleration functional load spectrum of that level, where the sum of the sample durations corresponding to all the effective values of each level is the action time corresponding to that level.

5. The method for compiling a vibration fatigue load spectrum according to claim 4, characterized in that, The multi-level acceleration functional load spectrum is a three-level acceleration functional load spectrum.

6. The method for compiling a vibration fatigue load spectrum according to claim 4, wherein Inputting the multi-level acceleration functional load spectrum into the bench test to obtain the fatigue damage corresponding to the multi-level acceleration functional load spectrum under the entire design life mileage includes: Input the multi-level acceleration functional load spectrum into the bench test, determine the fatigue damage under the action of each level of acceleration functional load spectrum, and obtain the fatigue damage under a cyclic functional load spectrum; Determine the fatigue damage under the entire design life mileage according to the line test operation mileage, the vehicle design life mileage, and the fatigue damage under the cyclic functional load spectrum.

7. The method for compiling a vibration fatigue load spectrum according to claim 6, wherein Calculating the vibration acceleration coefficient according to the fatigue damage, including: calculating the vibration acceleration coefficient according to the following formula k :[[]]END]] ； Among them, is the fatigue damage under the cyclic functional load spectrum, D is the fatigue damage over the entire service life, m is the parameter in the fatigue curve of the vibrating part.

8. A vibration fatigue load spectrum compilation device, characterized in that, Including: A time-domain load acquisition module for obtaining the vibration acceleration time-domain load obtained based on the line test; The effective value distribution determination module is configured to determine the effective value distribution of the vibration acceleration load in the vibration acceleration time-domain load according to a preset sample duration; The frequency spectrum compilation module is configured to compile an effective value frequency spectrum of the vibration acceleration load according to the effective value distribution, sort the effective values in ascending order, and count the number of times of the same effective value to form the effective value frequency spectrum; The functional load spectrum compilation module is configured to compile a multi-level acceleration functional load spectrum according to the effective value frequency spectrum and the sample duration, and each level of the acceleration functional load spectrum includes the effective value of the acceleration load and the corresponding action time; The fatigue damage acquisition module is configured to input the multi-level acceleration functional load spectrum into a bench test to obtain the fatigue damage corresponding to the multi-level acceleration functional load spectrum under the entire design life mileage; The acceleration coefficient calculation module is configured to calculate the vibration acceleration coefficient according to the fatigue damage; The long-life load spectrum compilation module is configured to compile an acceleration long-life load spectrum according to the multi-level acceleration functional load spectrum and the vibration acceleration coefficient.

9. The vibration fatigue load spectrum compilation device according to claim 8, characterized in that It further includes: The load spectrum type determination module is configured to determine the vibration acceleration load spectrum type according to the vibration acceleration time-domain load, The critical effective value determination module is configured to determine the critical effective value of the vibration acceleration load according to the structural fatigue limit value and the vibration acceleration load spectrum type, The frequency spectrum compilation module is specifically configured to compile an effective value frequency spectrum of the vibration acceleration load according to the part of the effective value distribution of the vibration acceleration load that is greater than or equal to the critical effective value.

10. The vibration fatigue load spectrum compilation device according to claim 9, characterized in that, The load spectrum type determination module is specifically configured to perform a Fourier transform on the vibration acceleration time-domain load to obtain the vibration acceleration power spectral density; perform an envelope processing on the vibration acceleration power spectral density to determine the vibration acceleration load spectrum type.

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