Bogie suspension structure vibration fatigue test method and system

Abstract

The application discloses a bogie hanging structure vibration fatigue test method and system, and belongs to the technical field of rail vehicles, and comprises the following steps: obtaining input vibration acceleration time domain load and acceleration power spectrum of the bogie hanging structure; taking the acceleration power spectrum as input load of a vibration test bench, synchronously collecting test tool input acceleration time domain signals and stress responses of key regions of the bogie hanging structure; obtaining acceleration-stress transfer functions of the bogie hanging structure; calculating stress response curves of the key regions of the bogie hanging structure, cyclically counting by a rain flow counting method, preparing stress spectra, and calculating relative fatigue damage values of the structure; constructing high-amplitude, medium-amplitude and low-amplitude three-level stress spectra, determining fatigue damage of the bogie hanging structure under the whole life mileage, and calculating cycle times corresponding to the high-amplitude, medium-amplitude and low-amplitude of the three-level stress spectra; and establishing three-level test stress spectra, and determining three-level constant frequency acceleration test spectra.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle technology, specifically relating to a method and system for vibration fatigue testing of bogie suspension structures. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] With the rapid development of rail transit, train operating speeds are constantly increasing, track conditions are deteriorating, and the vibration loads on bogies are continuously increasing, especially affecting the unsprung components of the primary suspension. Currently, the random vibration fatigue test methods for suspension components of rail vehicles mainly refer to standard IEC 61373 and the measured acceleration loads on the track. However, the vibration loads specified in the standard often differ significantly from the track loads of rail vehicles, resulting in fatigue damage calculations for suspension structures deviating from the actual structural damage.

[0004] Vibration fatigue tests based on line loads typically involve Fourier transforming the measured acceleration load to obtain the acceleration power spectrum, and then using amplitude amplification to accelerate the structural test. The inventors found that this method has the following main problems: (1) Line loads are generally non-stationary signals, and using their corresponding acceleration power spectrum as the input load for vibration tests will lead to a significant difference between the test results and the actual damage; (2) When simulating long-life conditions, the amplitude enhancement method is used to shorten the time by increasing the amplitude, which will lead to a significant difference between the test stress amplitude of the structure and the stress under actual service conditions, thus improving the overall vibration capability of the structure. In previous tests related to shaft-mounted cable supports, accelerated testing often resulted in multiple failures of structural connecting bolts and installation cables, extending the test cycle and increasing the test cost. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method and system for vibration fatigue testing of bogie suspension structures. This method obtains the stress-time history curve of the structure in service state by measuring the acceleration load on the track and the corresponding load-stress transfer function, and then compiles the stress spectrum. Finally, based on the fatigue damage consistency theory, an acceleration test spectrum that retains the actual stress amplitude and shortens the test time is constructed.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, the present invention provides a method for vibration fatigue testing of a bogie suspension structure, comprising the following steps:

[0008] Obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure;

[0009] The acceleration power spectrum was used as the input load of the vibration test bench, and the time-domain signal of the input acceleration of the test fixture and the stress response of the key area of ​​the bogie suspension structure were acquired simultaneously.

[0010] Obtain the acceleration-stress transfer function of the bogie suspension structure;

[0011] Calculate the stress response curves of key areas of the bogie suspension structure, use the rainflow counting method to cyclically count and compile stress spectra, and calculate the relative fatigue damage value of the structure.

[0012] Three-level stress spectra (high amplitude, medium amplitude, and low amplitude) were constructed to determine the fatigue damage of the bogie suspension structure over its entire service life and to calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three-level stress spectra.

[0013] A three-stage test stress spectrum was established, and a three-stage constant-frequency acceleration test spectrum was determined.

[0014] As a further technical solution, the time-domain load of the input vibration acceleration of the bogie suspension structure is obtained through line testing, and then the corresponding acceleration power spectrum is calculated using the Fourier transform method.

[0015] As a further technical solution, the acceleration-stress transfer function of the bogie suspension structure can be obtained by using neural network fitting methods or bandpass filtering.

[0016] As a further technical solution, the stress response curve of the key area of ​​the bogie suspension structure is calculated by combining the vibration acceleration input load and acceleration-stress transfer function in the line test; then, the relative fatigue damage value D1 of the structure is calculated by cyclic counting and compiling the stress spectrum through the rainflow counting method.

[0017] ;

[0018] Where, σ i n i , , respectively, represent the stress amplitude of the i-th level and the number of cycles in the stress amplitude spectrum, and C and m are the parameters of the wheel SN curve, respectively.

[0019] As a further technical solution, the stress response of key areas of the bogie suspension structure is statistically analyzed, and the maximum stress amplitude of the structure is calculated. This stress amplitude is then used as the highest stress amplitude σ of the test spectrum. max Determine the high amplitude σ max Medium amplitude 0.75 times σ max Low amplitude 0.5 times σ max The third-level stress amplitude.

[0020] As a further technical solution, the number of cycles corresponding to the high, medium, and low amplitudes in the three-level stress spectrum is set according to N:2N:3N.

[0021] As a further technical solution, based on the operating mileage L1 corresponding to the line test data and the vehicle design mileage L, the fatigue damage D of the bogie suspension structure over its entire lifespan is determined:

[0022]

[0023] As a further technical solution, based on the fatigue damage consistency theory, the number of cycles corresponding to the high, medium, and low amplitudes of the three-level stress spectrum is calculated using the following formula:

[0024]

[0025] As a further technical solution, the number of cycles corresponding to each stress amplitude satisfies a Gaussian distribution with a coefficient of variation of 0.1, and a test stress spectrum with a failure probability of 97.5% is established; the acceleration test spectrum is determined by combining the working capacity of the test bench and the test stress spectrum, and the test load application frequency is set.

[0026] Secondly, the present invention also provides a vibration fatigue testing system for bogie suspension structures, comprising:

[0027] The first module is used to obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure;

[0028] The second module is used to use the acceleration power spectrum as the input load of the vibration test bench, and to simultaneously acquire the time-domain signal of the input acceleration of the test fixture and the stress response of the key areas of the bogie suspension structure.

[0029] The third module is used to obtain the acceleration-stress transfer function of the bogie suspension structure;

[0030] The fourth module is used to calculate the stress response curves of key areas of the bogie suspension structure. It uses the rainflow counting method to cyclically count and compile stress spectra to calculate the relative fatigue damage value of the structure.

[0031] The fifth module is used to construct three levels of stress spectrum: high amplitude, medium amplitude, and low amplitude, to determine the fatigue damage of the bogie suspension structure over its entire service life, and to calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three levels of stress spectrum.

[0032] The sixth module is used to establish the stress spectrum of the three-level test and determine the spectrum of the three-level constant frequency acceleration test.

[0033] Thirdly, the present invention also provides a terminal device, which includes a processor and a memory, wherein the processor is used to implement various instructions; the memory is used to store multiple instructions, characterized in that the instructions are adapted to be loaded by the processor and executed as described above for the bogie suspension structure vibration fatigue test method.

[0034] Fourthly, the present invention also provides a computer-readable storage medium storing a plurality of instructions, characterized in that the instructions are adapted to be loaded by a processor of a terminal device and executed as described above for the bogie suspension structure vibration fatigue test method.

[0035] The beneficial effects of the present invention are as follows:

[0036] The vibration fatigue testing method of the present invention makes full use of the acceleration data from previous tests, thereby improving the utilization rate of line data and reducing the cost of dynamic stress testing of the line. In this method, the stress amplitudes of each level of the test stress spectrum are the stress values ​​in the actual service of the structure, which reduces the fatigue damage error caused by increasing the load amplitude to accelerate the test in conventional tests.

[0037] The vibration fatigue test method of the present invention directly determines the acceleration test spectrum from the stress under the service state of the structure, eliminating the influence of non-stationary track load on structural damage; the stress amplitude spectrum is based on a large amount of track test data, which includes various operating environments and load conditions of rail vehicles, such as track corrugation, high and low speed operation, entering tunnels, different curve radii and other typical conditions, and the test results are closer to the actual situation.

[0038] The vibration fatigue test method of the present invention adopts fixed-frequency high-medium-low cyclic loading, which fully considers the influence of the sequence of different acceleration amplitudes on the test results; the load form is simple and easy to apply, thus improving the test efficiency.

[0039] The vibration fatigue testing method of this invention applies an acceleration test spectrum that reduces the actual stress amplitude and shortens the test time. This reduces the probability of premature failure of mounting bolts and related accessories during the test, shortens the test cycle, and saves test costs. The acceleration test spectrum considers a structural failure probability of 97.5%, eliminating the influence of structural performance differences on the test results. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0041] Figure 1 This is a flowchart of a method for vibration fatigue testing of a bogie suspension structure according to one or more embodiments of the present invention;

[0042] Figure 2 This is a schematic diagram of the stress spectrum according to one or more embodiments of the present invention;

[0043] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0044] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] Example 1:

[0046] In a typical embodiment of the present invention, such as Figure 1 As shown, a vibration fatigue test method for bogie suspension structures is proposed. The method involves obtaining the time-domain load of the input vibration acceleration of the bogie suspension structure through track testing, calculating the corresponding acceleration power spectrum using Fourier transform, and then using this power spectrum as the input load for vibration bench testing. Simultaneously, the method acquires the input acceleration at the tooling location and the stress response of key areas of the suspension structure, and uses a neural network fitting method to obtain the acceleration-stress transfer function. Combining the numerous vibration acceleration input loads and acceleration-stress transfer functions from the track testing, the method calculates the stress response curves of key areas of the bogie suspension structure. The method uses rainflow counting to iteratively count and compile stress spectra, calculating the relative fatigue damage value of the structure. Based on the stress amplitude distribution characteristics of the suspension structure and the fatigue damage consistency theory, a three-level stress spectrum (high amplitude, medium amplitude, and low amplitude) is constructed. This stress spectrum retains the actual amplitude of the structure, and the test time is shortened by changing the number of cycles. Considering the certain dispersion of structural performance among different samples of the bogie suspension components, a three-level test stress spectrum with a failure probability of 97.5% is established, and finally, a three-level fixed-frequency acceleration test spectrum is determined.

[0047] Specifically, the vibration fatigue test method for the bogie suspension structure in this embodiment includes the following process:

[0048] S1: Obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure;

[0049] In this embodiment, the time-domain load of the input vibration acceleration of the bogie suspension structure is obtained through line testing, and then the corresponding acceleration power spectrum is calculated using the Fourier transform method.

[0050] S2: Use the above acceleration power spectrum as the input load of the vibration test bench, and simultaneously acquire the time-domain signal of the input acceleration of the test fixture and the stress response of the key area of ​​the bogie suspension structure;

[0051] In this embodiment, the critical area of ​​the bogie suspension structure refers to the area at risk of structural fatigue.

[0052] S3: Obtain the acceleration-stress transfer function of the bogie suspension structure;

[0053] In this embodiment, the acceleration-stress transfer function of the bogie suspension structure is obtained by using a neural network fitting method or a bandpass filter.

[0054] S4: Calculate the stress response curves of key areas of the bogie suspension structure, cyclically count using the rainflow counting method and compile the stress spectrum to calculate the relative fatigue damage value of the structure;

[0055] In this embodiment, the stress response curve of the key area of ​​the bogie suspension structure is calculated by combining a large number of vibration acceleration input loads and acceleration-stress transfer functions in the line test; then, the stress spectrum is compiled by cyclic counting using the rainflow counting method, and the relative fatigue damage value D1 of the structure is calculated using formula (1);

[0056]

[0057] Where, σ i n i , respectively, represent the stress amplitude of level i and the number of cycles in the stress amplitude spectrum, and C and m are the relevant parameters of the wheel SN curve, where m takes the value of 3.5.

[0058] S5: Construct three-level stress spectra of high amplitude, medium amplitude, and low amplitude to determine the fatigue damage of the bogie suspension structure throughout its entire service life and calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three-level stress spectra.

[0059] In this embodiment, based on the stress amplitude distribution characteristics of the suspended structure and the fatigue damage consistency theory, a three-level stress spectrum of high amplitude, medium amplitude, and low amplitude is constructed. This stress spectrum retains the actual amplitude of the structure, and the test time is shortened by changing the number of cycles.

[0060] Specifically, the stress response of key areas of the bogie suspension structure was analyzed and statistically analyzed, and the maximum stress amplitude of the structure was calculated. This stress amplitude was used as the highest stress amplitude σ of the test spectrum. max Determine the high amplitude σ max Medium amplitude 0.75 times σ max Low amplitude 0.5 times σ max The third-level stress amplitude.

[0061] The relationship between stress amplitude and cycle number in the stress spectrum shows that as the stress amplitude increases, the corresponding cycle number decreases continuously. Considering the test cycle of the structure, the cycle number corresponding to high, medium and low amplitudes in the three-level stress spectrum is set as N:2N:3N.

[0062] Based on the operational mileage L1 corresponding to the line test data and the vehicle design mileage L, determine the fatigue damage D of the bogie suspension structure over its entire service life:

[0063]

[0064] Based on the fatigue damage consistency theory, the number of cycles corresponding to the high, medium, and low amplitudes of the three-level stress spectrum is calculated using the following formula:

[0065]

[0066] S6: Considering the certain discreteness of the structural performance between different samples of bogie suspension components, a three-level test stress spectrum with a failure probability of 97.5% is established, and finally the three-level constant frequency acceleration test spectrum is determined.

[0067] Since the fatigue performance of different samples of the suspension structure has a certain degree of dispersion, considering that the number of cycles corresponding to each stress amplitude satisfies a Gaussian distribution with a coefficient of variation of 0.1, a test stress spectrum with a failure probability of 97.5% is established.

[0068] The acceleration test spectrum was determined by combining the working capacity of the test bench and the test stress spectrum, and the test load application frequency was set.

[0069] To consider the impact of different load amplitudes and loading sequences on the structural test results, high, medium, and low amplitude loads were applied cyclically during the test.

[0070] This invention fully utilizes prior line acceleration test data, improving the data utilization rate and reducing the cost of line dynamic stress testing. The calculated stress response accurately reflects the stress level of the bogie suspension structure under service conditions. The maximum stress amplitude in the test stress spectrum is the maximum stress value calculated under line load, and all stress amplitudes are actual stress values ​​in the structure during service. This reduces fatigue damage errors caused by increasing load amplitude in conventional tests, resulting in test results that are closer to reality. The acceleration test spectrum is directly determined by the stress under structural service conditions, eliminating the influence of line load randomness on structural damage. The acceleration test spectrum uses fixed-frequency high-medium-low cyclic loading, fully considering the influence of different amplitude sequences on the test results. The vibration fatigue test method proposed in this invention has a simple load form, is easy to apply, shortens the test cycle, improves test efficiency, and reduces test costs.

[0071] Example 2:

[0072] This embodiment proposes a vibration fatigue testing system for bogie suspension structures, including:

[0073] The first module is used to obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure;

[0074] The second module is used to use the acceleration power spectrum as the input load of the vibration test bench, and to simultaneously acquire the time-domain signal of the input acceleration of the test fixture and the stress response of the key areas of the bogie suspension structure.

[0075] The third module is used to obtain the acceleration-stress transfer function of the bogie suspension structure;

[0076] The fourth module is used to calculate the stress response curves of key areas of the bogie suspension structure. It uses the rainflow counting method to cyclically count and compile stress spectra to calculate the relative fatigue damage value of the structure.

[0077] The fifth module is used to construct three levels of stress spectrum: high amplitude, medium amplitude, and low amplitude, to determine the fatigue damage of the bogie suspension structure over its entire service life, and to calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three levels of stress spectrum.

[0078] The sixth module is used to establish the stress spectrum of the three-level test and determine the spectrum of the three-level constant frequency acceleration test.

[0079] It should be noted that the specific implementation process of each of the above modules has been described in detail in Implementation Example 1, and will not be described in detail here.

[0080] Example 3:

[0081] This embodiment proposes a terminal device, including a server. The server includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the vibration fatigue test method for the bogie suspension structure in Embodiment 1. For simplicity, further details are omitted here.

[0082] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0083] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0084] In the implementation process, each step of the above method can be completed by the integrated logic circuits in the processor hardware or by instructions in software.

[0085] Example 4:

[0086] This embodiment proposes a computer-readable storage medium storing multiple instructions adapted for loading and execution by a processor of a terminal device using the bogie suspension structure vibration fatigue test method described in Embodiment 1.

[0087] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] This invention is described in terms of flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowcharts and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0089] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vibration fatigue test method for a bogie suspension structure, characterized in that, Includes the following steps: Obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure; The acceleration power spectrum was used as the input load of the vibration test bench, and the time-domain signal of the input acceleration of the test fixture and the stress response of the key area of ​​the bogie suspension structure were acquired simultaneously. Obtain the acceleration-stress transfer function of the bogie suspension structure; Calculate the stress response curves of key areas of the bogie suspension structure, use the rainflow counting method to cyclically count and compile stress spectra, and calculate the relative fatigue damage value of the structure. Three-level stress spectra (high amplitude, medium amplitude, and low amplitude) were constructed to determine the fatigue damage of the bogie suspension structure over its entire service life and to calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three-level stress spectra. A three-stage test stress spectrum was established, and a three-stage constant-frequency acceleration test spectrum was determined.

2. The vibration fatigue test method for bogie suspension structure as described in claim 1, characterized in that, The time-domain load of the input vibration acceleration of the bogie suspension structure was obtained through line testing, and then the corresponding acceleration power spectrum was calculated using the Fourier transform method.

3. The vibration fatigue test method for bogie suspension structure as described in claim 1, characterized in that, The acceleration-stress transfer function of the bogie suspension structure can be obtained by using neural network fitting or bandpass filtering.

4. The vibration fatigue test method for bogie suspension structure as described in claim 1, characterized in that, The stress response curves of key areas of the bogie suspension structure were calculated by combining the vibration acceleration input load and acceleration-stress transfer function from the line test; then, the relative fatigue damage value of the structure was calculated by cyclic counting and compiling the stress spectrum using the rainflow counting method. D 1; ； in, i 、n i These are the first values ​​in the stress amplitude spectrum. i Stress amplitude and number of cycles, C, m respectively wheels SN The relevant parameters of the curve.

5. The vibration fatigue test method for bogie suspension structure as described in claim 4, characterized in that, The stress response of key areas of the bogie suspension structure was statistically analyzed, and the maximum stress amplitude of the structure was calculated. This stress amplitude was then used as the highest stress amplitude of the test spectrum. max, determines the high amplitude. max, medium amplitude 0.75 times max, low amplitude 0.5 times The maximum third-level stress amplitude.

6. The vibration fatigue test method for bogie suspension structure as described in claim 1 or 5, characterized in that, In the three-level stress spectrum, the number of cycles corresponding to high, medium, and low amplitudes is set according to N:2N:3N.

7. The vibration fatigue test method for bogie suspension structure as described in claim 5, characterized in that, Based on the operational mileage L1 corresponding to the line test data and the vehicle design mileage L, determine the fatigue damage D of the bogie suspension structure over its entire service life:

8. The vibration fatigue test method for bogie suspension structure as described in claim 7, characterized in that, Based on the fatigue damage consistency theory, the number of cycles corresponding to the high, medium, and low amplitudes of the three-level stress spectrum is calculated using the following formula:

9. The vibration fatigue test method for bogie suspension structure as described in claim 1, characterized in that, The number of cycles corresponding to each stress amplitude satisfies a Gaussian distribution with a coefficient of variation of 0.1, and a test stress spectrum with a failure probability of 97.5% is established. The acceleration test spectrum is determined by combining the working capacity of the test bench and the test stress spectrum, and the test load application frequency is set.

10. A vibration fatigue testing system for a bogie suspension structure, characterized in that, include: The first module is used to obtain the time-domain load and acceleration power spectrum of the input vibration acceleration of the bogie suspension structure; The second module is used to use the acceleration power spectrum as the input load of the vibration test bench, and to simultaneously acquire the time-domain signal of the input acceleration of the test fixture and the stress response of the key areas of the bogie suspension structure. The third module is used to obtain the acceleration-stress transfer function of the bogie suspension structure; The fourth module is used to calculate the stress response curves of key areas of the bogie suspension structure. It uses the rainflow counting method to cyclically count and compile stress spectra to calculate the relative fatigue damage value of the structure. The fifth module is used to construct three levels of stress spectrum: high amplitude, medium amplitude, and low amplitude, to determine the fatigue damage of the bogie suspension structure over its entire service life, and to calculate the number of cycles corresponding to the high, medium, and low amplitude values ​​of the three levels of stress spectrum. The sixth module is used to establish the stress spectrum of the three-level test and determine the spectrum of the three-level constant frequency acceleration test.

11. A terminal device comprising a processor and a memory, the processor for implementing instructions; the memory for storing multiple instructions, characterized in that, The instructions are adapted to be loaded by a processor and executed as described in any one of claims 1-9, the method for vibration fatigue testing of bogie suspension structures.

12. A computer-readable storage medium storing a plurality of instructions, characterized in that, The instructions are adapted to be loaded by the processor of the terminal device and executed by the method for vibration fatigue testing of bogie suspension structure according to any one of claims 1-9.

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