Vehicle durability bench test method, device, equipment and storage medium

Abstract

The present application relates to the field of vehicle testing technology, and discloses a vehicle durability bench test method, device, equipment and storage medium, the method comprising: determining target hook load data according to hook load data of the vehicle at various loading levels on different road types; determining a combined road load spectrum according to the target hook load data; determining a target bench load spectrum according to the combined road load spectrum; performing a durability bench test of the hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result. The present application can effectively improve the efficiency of the vehicle durability bench test.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a vehicle durability bench test method, device, equipment and storage medium. Background Art

[0002] With the export of vehicles overseas and the demand for travel, vacation and leisure by domestic users, the demand for vehicles that can be towed to RVs is becoming more and more vigorous, and the weight requirements for towed RVs are getting higher and higher. In order to meet user needs, OEMs need to develop products that can be towed to RVs.

[0003] The body and tow hook of a trailer RV need to meet regulatory requirements while also having high durability and reliability to satisfy users' long-term and long-mileage use on different road surfaces. In order to ensure the structural reliability of the body and tow hook, a large number of fatigue durability tests need to be carried out on the body and tow hook. These mainly include road tests in proving grounds and indoor bench tests. Among them, road tests have the disadvantages of long cycles, high costs and poor repeatability, which limit their large-scale use in the automotive research and development and verification stages. The bench test has a short cycle, low cost and easy repeatability, which is a good supplement to the road test. Due to the randomness and complexity of the road load spectrum, it is difficult to load directly on the laboratory bench, resulting in low test efficiency.

[0004] Therefore, how to effectively improve the efficiency of vehicle durability bench testing is a problem that needs to be solved urgently.

[0005] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of the present application is to provide a vehicle durability bench test method, device, equipment and storage medium, aiming to solve the technical problem of how to effectively improve the efficiency of vehicle durability bench testing.

[0007] To achieve the above objectives, the present application proposes a vehicle durability bench test method, the method comprising:

[0008] Determine target tow hook load data according to tow hook load data at various loading levels of the vehicle on different road types;

[0009] Determining a combined road load spectrum according to the target tow hook load data;

[0010] Determining a target bench load spectrum according to the combined road load spectrum;

[0011] A durability bench test of the tow hook is performed according to the target bench load spectrum and the combined road load spectrum to obtain a test result.

[0012] In one embodiment, determining the target tow hook load data according to the tow hook load data at each loading level of the vehicle on different road types includes:

[0013] Collect the trailer load data of the vehicle at various loading levels on different road types;

[0014] Determining actual pseudo damage values ​​and pseudo damage means for different road surface types according to the tow hook load data;

[0015] The target hook load data in the hook load data is determined according to the actual pseudo damage values ​​and the pseudo damage mean values ​​of the different road types.

[0016] In one embodiment, determining a target test bench load spectrum according to the combined road load spectrum includes:

[0017] Determining a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum;

[0018] Determining the pseudo damage value and the load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix;

[0019] Determine a single cycle load and a corresponding number of cycles according to the pseudo damage value and load amplitude of each load block;

[0020] A target bench load spectrum is determined according to the single cycle load and the number of cycles.

[0021] In one embodiment, determining a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum includes:

[0022] generating a rain flow matrix according to the combined road load spectrum;

[0023] generating a two-dimensional rain flow histogram according to the rain flow matrix;

[0024] Determining rainfall statistics results according to the two-dimensional rain flow histogram;

[0025] A load data matrix is ​​determined according to the rainfall statistics results.

[0026] In one embodiment, determining the pseudo damage value and the load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix includes:

[0027] Dividing the two-dimensional rain flow histogram into a plurality of regions;

[0028] Obtaining a load threshold value of each area, and dividing the load data matrix into a plurality of load blocks according to the load threshold value;

[0029] Obtain the load range information and corresponding cycle number in each load block;

[0030] Determine the pseudo damage value of each load block according to the load range information and the corresponding number of cycles in each load block;

[0031] The load amplitude of each load block is determined according to the load threshold of each area.

[0032] In one embodiment, determining a single cycle load and a corresponding number of cycles according to the pseudo damage value and the load amplitude of each load block includes:

[0033] Obtaining a load mean value of each load block, and determining a single cycle load according to the load mean value and load amplitude of each load block;

[0034] Obtaining a pseudo damage value of the single cycle load;

[0035] The number of cycles of the single cycle load is determined according to the pseudo damage values ​​of the load blocks and the pseudo damage value of the single cycle load.

[0036] In one embodiment, the durability bench test of the tow hook is performed according to the target bench load spectrum and the combined road load spectrum to obtain the test result, including:

[0037] Construct finite element simulation model of towing hook and towing beam;

[0038] Determining the unit load stress of the towing hook according to the finite element simulation model;

[0039] Determine a first true damage value and a second true damage value of the towing hook according to the towing hook unit load stress, the target bench load spectrum and the combined road load spectrum;

[0040] Determining whether the target bench load spectrum and the combined road load spectrum are equivalent according to the first true damage value and the second true damage value;

[0041] When equivalent, a durability bench test is performed according to the target bench load spectrum to obtain a test result.

[0042] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle durability bench test device, the vehicle durability bench test device comprising:

[0043] A determination module, used for determining target tow hook load data according to tow hook load data of the vehicle at various loading levels on different road types;

[0044] The determination module is further used to determine a combined road load spectrum according to the target towing hook load data;

[0045] The determination module is further used to determine a target test bench load spectrum according to the combined road load spectrum;

[0046] The test module is used to perform a durability bench test of the tow hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result.

[0047] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle durability bench test equipment, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program is configured to implement the steps of the vehicle durability bench test method as described above.

[0048] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the vehicle durability bench test method described above are implemented.

[0049] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the vehicle durability bench test method described above are implemented.

[0050] The present application provides a vehicle durability bench test method, which can effectively improve the efficiency of the vehicle durability bench test by first determining target tow hook load data based on the tow hook load data of the vehicle at various loading levels when on different road types; determining a combined road load spectrum based on the target tow hook load data; determining a target bench load spectrum based on the combined road load spectrum; and performing a durability bench test of the tow hook based on the target bench load spectrum and the combined road load spectrum to obtain test results.

[0051] In summary, the present application overcomes the technical defect of low efficiency of existing durability bench tests by determining target trailer hook load data based on trailer hook load data at various loading levels when the vehicle is on different road types, and then determining a combined road load spectrum and a target bench load spectrum and conducting a durability bench test of the trailer hook, thereby effectively improving the efficiency of vehicle durability bench tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0054] Figure 1 A schematic diagram of a process flow provided for the first embodiment of the vehicle durability bench test method of the present application;

[0055] Figure 2 A schematic diagram of a unit load finite element model of a tow hook and a crossbeam provided in Example 1 of the vehicle durability bench test method of the present application;

[0056] Figure 3 A schematic diagram of the vehicle body and tow hook bench durability test verification provided in Example 1 of the vehicle durability bench test method of this application;

[0057] Figure 4 A schematic flow chart of the second embodiment of the vehicle durability bench test method of the present application;

[0058] Figure 5 A schematic diagram of the statistical blocks of two-dimensional rain flow in the X direction provided in Example 2 of the vehicle durability bench test method of the present application;

[0059] Figure 6 A schematic diagram of the mean value of the two-dimensional rain flow statistics block in the X direction provided in the second embodiment of the vehicle durability bench test method of the present application;

[0060] Figure 7 This is a schematic diagram of the module structure of the vehicle durability bench test device according to an embodiment of the present application;

[0061] Figure 8 Schematic diagram of the equipment structure of the hardware operating environment involved in the vehicle durability bench test method in the embodiment of the present application.

[0062] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0063] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0064] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0065] The main solution of the embodiment of the present application is: determine the target tow hook load data according to the tow hook load data of the vehicle at various loading levels on different road types; determine the combined road load spectrum according to the target tow hook load data; determine the target bench load spectrum according to the combined road load spectrum; perform a durability bench test of the tow hook according to the target bench load spectrum and the combined road load spectrum to obtain the test results.

[0066] The body and tow hook of a trailer caravan need to meet regulatory requirements while also having high durability and reliability to meet the needs of users for long-term and long-mileage use on different road surfaces. In order to ensure the structural reliability of the body and tow hook, a large number of fatigue durability tests need to be carried out on the body and tow hook. They mainly include road tests in proving grounds and indoor bench tests. Among them, road tests have the disadvantages of long cycles, high costs and poor repeatability, which limit their large-scale use in the automotive research and development and verification stages. The bench test has a short cycle, low cost and easy repeatability, which is a good supplement to the road test. Due to the randomness and complexity of the road load spectrum, it is difficult to load directly on the laboratory bench, resulting in low test efficiency. Therefore, how to effectively improve the efficiency of vehicle durability bench tests is a problem that needs to be solved urgently.

[0067] The present application determines the target tow hook load data based on the tow hook load data at various loading levels when the vehicle is on different road types, and then determines the combined road load spectrum and the target bench load spectrum and conducts a durability bench test on the tow hook. This overcomes the technical defect of low efficiency of existing durability bench tests and can effectively improve the efficiency of vehicle durability bench tests.

[0068] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a vehicle durability bench test system, etc. The following takes the vehicle durability bench test system as an example to illustrate this embodiment and the following embodiments.

[0069] Based on this, the embodiment of the present application provides a vehicle durability bench test method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the vehicle durability bench test method of the present application.

[0070] In this embodiment, the vehicle durability bench test method includes steps S10 to S40:

[0071] Step S10, determining target tow hook load data according to the tow hook load data at various loading levels when the vehicle is on different road types.

[0072] It should be noted that the road surface types may include stone roads, resonance roads, pothole roads, brake roads, turning roads, etc. The loading level is determined according to different loading weights, such as full load, half load, empty load, etc.

[0073] It is understandable that the tow hook is a device that connects the trailer and the tractor, and its durability directly affects the stability and safety of the entire towing system. The tow hook load data refers to the load data borne by the tow hook under specific road types and loading levels, which can be obtained through experimental tests or simulation analysis.

[0074] It is worth noting that the vehicle in this embodiment can be a trailer caravan or other types of caravans, and this embodiment does not specifically limit this. This embodiment is described by taking a trailer caravan as an example. The trailer caravan test vehicle is modified, the local structure of the rear longitudinal beam is strengthened, and a trailer module is installed, including a trailer cross beam and a trailer hook. A three-axial force sensor is arranged on the trailer hook. Based on the principle of resistance strain gauge, the static and dynamic force conditions of the trailer hook in the three directions of X / Y / Z can be measured in real time, and the trailer hook load data can be obtained.

[0075] In the specific implementation, a data collection strategy is formulated, and the tow hook load data of the vehicle at various loading levels on different road types is collected according to the data collection strategy. That is, the towed RV loading is required to cover the towing capacity of mainstream passenger car load-bearing bodies at home and abroad. There are 6 types of counterweights, including LOAD1, LOAD2, LOAD3, LOAD4, LOAD5, and LOAD6. Then, the horizontal tension value D of each counterweight tow hook can be preliminarily calculated. C , as follows:

[0076]

[0077] Among them, D C The horizontal pulling force that each counterweight tow hook bears is in KN. g is the acceleration due to gravity, which can be 9.81m / s. 2 , M1 is the total mass of the tractor, unit is t, M2 is the total mass of the towed RV, unit is t.

[0078] In a feasible implementation, step S10 may include: collecting trailer load data of the vehicle at various loading levels on different road types; determining actual pseudo-damage values ​​and pseudo-damage means for different road types based on the trailer load data; and determining target trailer load data in the trailer load data based on the actual pseudo-damage values ​​and pseudo-damage means for the different road types.

[0079] It should be noted that the pseudo-damage value is an indicator used to quantify the degree of damage to a structure when subjected to a load, and is often used in fatigue durability analysis. By calculating the pseudo-damage value corresponding to the tow hook load data under different road types and loading levels, the fatigue degree of the tow hook under different working conditions can be evaluated, and then the key working conditions that have a greater impact on the durability of the tow hook, i.e., the target tow hook load data, can be determined.

[0080] It is understandable that according to the road durability test specification for tractor trailers, the three-axis force collection test of the tow hook under different loadings and different roads is carried out at the durability test site, and each loading and road surface is collected 3 times. The road surface includes a total of N types of road surfaces, including stone roads, resonance roads, pothole roads, braking roads, and turning roads. The segmented collection data is named "road surface_loading_jth collection", and 6*N*3 segments of three-axis force collection data are obtained, that is, the tow hook load data of the vehicle at each loading level on different road types.

[0081] In the specific implementation, the median load, i.e., the load data of load LOAD3, is taken for bench test, including the discreteness analysis of load data, i.e., the load data of three times on N kinds of road surfaces are analyzed in the data processing software Ncode. ij The pseudo-damage analysis of the X-direction load FX, the Y-direction load FY, and the Z-direction load FZ in (i=1,2,…N,j=1,2,3) is performed respectively to obtain the pseudo-damage values ​​of FX, FY, and FZ respectively, and the pseudo-damage values ​​of FX, FY, and FZ are added together to obtain the total pseudo-damage value D of the three-direction loads of the tow hook collected for the jth time on the i-th road surface ij (i=1,2,…N,j=1,2,3), further summing up can get the actual pseudo damage value of the i-th road surface, and then calculating the average value to get the pseudo damage mean value of the load data of each road surface, as shown in the following formula:

[0082]

[0083] Among them, D ij is the total pseudo damage value of the tow hook load in three directions collected for the jth time on the i-th road surface, D i is the pseudo damage mean of the load data of the i-th road surface.

[0084] The actual pseudo damage value D of each road surface ij The mean pseudo damage value D of the road surface i Compare and select the load data with the smaller relative deviation as the official load data of the road surface, and determine the N-segment load data Road i (i=1,2,…N), namely the target towing hook load data.

[0085] It is worth noting that in the data processing software Ncode, the CurveFitting module is used to perform N-segment load data Road i Correlation analysis of the forces in the X and Z directions, with FX as the horizontal coordinate and FZ as the vertical coordinate, is performed based on the linear regression algorithm to determine the correlation slope K of each segment of collected data. i , as follows:

[0086] FZ=K i *FX+A

[0087] Among them, FZ is the load in the Z direction, FX is the load in the X direction, K i is the correlation slope and A is a constant.

[0088] According to the correlation slope K i The angle θ between the X-direction and Z-direction loads on the tow hook on each section of road can be calculated i :

[0089]

[0090] Among them, θ i is the angle θ between the X-direction and Z-direction loads on the tow hook on the i-th road surface i , K i is the correlation slope.

[0091] Step S20: determining a combined road load spectrum according to the target towing hook load data.

[0092] It should be noted that the road load spectrum refers to the collection and integration of target hook load data on different road types to form a set of load spectra that comprehensively reflects the load conditions that vehicles may encounter in actual road driving. This process is designed to simulate the real road environment and provide accurate and reliable load input for the design of vehicle structural parts, fatigue life analysis and performance optimization.

[0093] It can be understood that the TestCombination module is used in the data processing software Ncode to perform the time domain load spectrum cycle combination, that is, according to the cycle number Count corresponding to the road surface i in the durability road test specification i , the load data of N segments of a single cycle Road i (i=1,2,…N), i.e., the target hook load data, is repeated for the number of cycles required for the corresponding road surface i, and finally a section of combined road spectrum load data is obtained, i.e., the combined road load spectrum, as shown in the following formula:

[0094]

[0095] Among them, Road sum To match the road load spectrum, Road i is the load data of road surface i, Count i is the number of cycles corresponding to road surface i.

[0096] Step S30: determining a target test bench load spectrum according to the combined road load spectrum.

[0097] It should be noted that the target bench load spectrum is obtained by further processing the composite road load spectrum and is used to simulate the load conditions in actual road driving on the test bench. The actual road environment can be converted into the loading conditions on the test bench so as to perform fatigue life testing and performance evaluation on vehicle structural parts in a laboratory environment.

[0098] It can be understood that the target bench load spectrum is a three-axis three-level BLOCK bench load spectrum, where the three axes refer to the test object or load spectrum taking into account the loads in three directions. Usually in vehicles or mechanical systems, these three axes refer to the X-axis (longitudinal), Y-axis (lateral) and Z-axis (vertical), which means that the load spectrum not only contains forces in one direction, but also fully considers all major load directions in three-dimensional space. Level three refers to dividing the load spectrum into three different blocks according to intensity, frequency or other relevant parameters. The load spectrum of each block represents a typical load condition in actual use, which is used to simplify complex load environments and facilitate targeted durability or fatigue testing. The classification may be based on the size of the load, such as light load, medium load and heavy load, or it may be divided according to the frequency and importance of occurrence. The bench load spectrum refers to the data collected under actual working conditions, which is used in bench tests after statistical processing to reproduce these load conditions, that is, dynamic or static loads will be applied according to the bench load spectrum to verify whether the tow hook can withstand the expected use conditions.

[0099] Step S40: performing a durability bench test on the towing hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result.

[0100] It should be noted that bench testing is a laboratory testing method that simulates real working conditions and is used to evaluate the performance and durability of vehicle components, subsystems or the entire powertrain.

[0101] It is understandable that when conducting a durability bench test on a tow hook, it is first necessary to ensure that the test equipment can accurately simulate the load conditions described by the target bench load spectrum. Through a professional test bench, various loads can be applied to the tow hook under a controlled environment, including loads in the X, Y and Z directions, as well as the frequency and amplitude of these load changes. During the test, key parameters such as deformation, stress distribution, fatigue crack growth, etc. of the tow hook will be recorded to evaluate its durability performance.

[0102] In a feasible implementation, step S40 may include: constructing a finite element simulation model of the towing hook and the towing beam; determining the unit load stress of the towing hook according to the finite element simulation model; determining a first real damage value and a second real damage value of the towing hook according to the unit load stress of the towing hook, the target bench load spectrum and the combined road load spectrum; determining whether the target bench load spectrum and the combined road load spectrum are equivalent according to the first real damage value and the second real damage value; when they are equivalent, performing a durability bench test according to the target bench load spectrum to obtain a test result.

[0103] It should be noted that the finite element simulation model is a mathematical model that simulates the behavior of a physical system on a computer, allowing engineers to perform detailed mechanical analysis of actual objects or structures in a virtual environment. In the durability evaluation of the towing hook, the construction of a finite element simulation model of the towing hook and the towing beam can accurately simulate the stress distribution and deformation of the towing hook in actual work, providing strong support for subsequent bench tests.

[0104] It is understandable that the finite element simulation model of the towing hook and the trailer beam is established. The beam is simulated by shell elements with a mesh size of 5mm, and the towing hook is simulated by hexahedral elements with a size of 3mm. The towing hook and the beam model are assembled together using rigid units to simulate bolt connections. All degrees of freedom are constrained at the connection point between the beam and the vehicle body. Unit loads in the X, Y, and Z directions are loaded at the ball head position at the front end of the towing hook. The output displacement and stress are set, and the stress of the towing hook under unit load is calculated through the solver, that is, the unit load stress of the towing hook, such as Figure 2 As shown, Figure 2 Schematic diagram of the unit load finite element model of the tow hook and beam.

[0105] It is worth noting that in the fatigue analysis software, the unit load stress of the tow hook and the Road sum For the road load spectrumRoad sum And the target bench load spectrum F BLOCK_sum , respectively calculate the load spectrum of the towing hook body on the combined road Road sum and the target bench load spectrum F BLOCK_sum The maximum true damage value under road With Damage BLOCK , namely the first real damage value and the second real damage value. road With Damage BLOCK Compare them. If the ratio of the two is between 0.95-1.05 and the positions are the same, then the target bench load spectrum F is determined. BLOCK_sum Combined road load spectrumRoad sum If the target bench load spectrum F is not equivalent, the target bench load spectrum F is recalculated. BLOCK_sum .

[0106] In the target bench load spectrum F BLOCK_sum Combined road load spectrumRoad sum Equivalently, the number of samples required to pass the type test at a given confidence level and failure rate is calculated based on the Bayes formula as follows:

[0107]

[0108] Among them, R is the reliability, the value of the tow hook test is 0.95, C is the confidence level, the value is 0.5, N1 is the number of samples required to pass the test under this reliability and confidence level, the value is 14.

[0109] Based on the Lipson exchange formula, at the same quality level, the test time for a preset number of samples, that is, the reliability enhancement factor, is calculated as follows:

[0110]

[0111] Among them, N1 is the number of samples required for the standard test calculated by the Bayes formula, and its value is 14. N2 is the number of samples used in the enhanced test plan. In the tow hook test, N2 is 2. X2 is the time or number of cycles required for the standard test; X1 is the time or number of cycles required for the enhanced test; β is the parameter of the Weibull distribution function, and its value for automobiles is 2.

[0112] By using the Bayes and Lipson calculation formula, it can be calculated that when the number of tow hook test samples is N2 = 2, the required test strengthening factor is K = 2.64. The total number of cycles of the triaxial bench test is K*F BLOCK_sum .

[0113] In the specific implementation, the vehicle body and tow hook bench durability test verification is carried out, including: taking the white body to assemble the towing crossbeam and the tow hook, the front end, middle and rear of the vehicle body are fixed with tooling, and the 123456 degrees of freedom of the vehicle body are constrained. The bench loads in the X, Y, and Z directions are sequentially loaded at the tow hook ball head position. The number of load cycles in each direction is K*F BLOCK_sum ,like Figure 3 As shown, Figure 3 Schematic diagram of the vehicle body and tow hook bench durability test verification.

[0114] According to the collected 6 different loads LOAD1, LOAD2, LOAD3, LOAD4, LOAD5, LOAD6, the tractor mass M can be obtained. i , RV mass m i (i=1-6). The pseudo damage parameter D can be obtained by performing pseudo damage analysis on the X-direction load among the six road loads collected. _x_i .i 、m i , D _x_i Input the data into the origin software, and the function fitting can be automatically performed to finally obtain the damage fitting function, as shown below:

[0115]

[0116] Among them, damage is the damage fitting function, M is the mass of the tractor, m is the mass of the RV, and α is the proportional coefficient.

[0117] According to the damage fitting function, the damage value of the tow hook can be calculated if the mass of any tractor and RV is known, and then the amplitude and mean of the load can be adjusted to derive a new bench load spectrum.

[0118] The present embodiment provides a vehicle durability bench test method, which can effectively improve the efficiency of the vehicle durability bench test by first determining target tow hook load data based on the tow hook load data of the vehicle at various loading levels when on different road types; determining a combined road load spectrum based on the target tow hook load data; determining a target bench load spectrum based on the combined road load spectrum; and performing a durability bench test of the tow hook based on the target bench load spectrum and the combined road load spectrum to obtain test results.

[0119] In summary, this embodiment determines the target tow hook load data based on the tow hook load data at various loading levels when the vehicle is on different road types, and then determines the combined road load spectrum and the target bench load spectrum and conducts a durability bench test on the tow hook. This overcomes the technical defect of low efficiency of the existing durability bench test and can effectively improve the efficiency of the vehicle durability bench test.

[0120] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 4 , the step S30 further includes steps S301-S304:

[0121] Step S301, determining a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum.

[0122] It should be noted that the two-dimensional rain flow histogram refers to a histogram drawn by a rain flow counting method based on two independent variables (such as load range and load mean), which can clearly show the corresponding relationship between load range and load mean. The two-dimensional rain flow histogram is used to analyze the different load levels and their corresponding occurrence frequencies in the road load spectrum, providing data support for the subsequent determination of the target test bench load spectrum.

[0123] In a feasible implementation, step S301 may include: generating a rain flow matrix according to the combined road load spectrum; generating a two-dimensional rain flow histogram according to the rain flow matrix; determining rainfall statistics according to the two-dimensional rain flow histogram; and determining a load data matrix according to the rainfall statistics.

[0124] It should be noted that the rain flow matrix refers to a matrix obtained by grouping the load data in the combined road load spectrum according to certain rules (such as load range and load mean), and counting the frequency and cumulative frequency of the load data in each group. Through the rain flow matrix, the different load levels in the combined road load spectrum and their corresponding occurrence frequencies and other information can be clearly displayed. Then, based on the data in the rain flow matrix, a two-dimensional rain flow histogram can be drawn to further display the corresponding relationship between the load range and the load mean. Next, by performing rainfall statistics on the two-dimensional rain flow histogram, statistical results such as frequency and cumulative frequency at different load levels can be obtained. Finally, based on these statistical results, the load data matrix can be determined.

[0125] In the specific implementation, the Rainflow module is used in the data processing software Ncode to use the rain flow counting method to count the history of the combined road load spectrum, and the amplitude, mean, frequency and other information under the specified load level are obtained. The combined road load spectrum is divided into a 64-level rain flow matrix, and the two-dimensional rain flow histogram Range_Mean in the three directions of X, Y, and Z are output respectively, where the horizontal axis is the load range and the vertical axis is the load mean. The rainfall statistics are performed on the two-dimensional rain flow histogram and the rain flow statistics results are output to an Excel table for data editing to obtain a load data matrix. The load data matrix is ​​a 64*64 data matrix, the horizontal data is the 64-level load range information, and the vertical data is the 64-level mean information. The intersection of the matrix horizontally and vertically is the corresponding load cycle count information. Taking the 64-level load range as the base, the cycle counts of different means under each load range are summed and transposed to obtain the 64-level load range and its corresponding number of cycles.

[0126] Step S302: determining the pseudo damage value and load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix.

[0127] It should be noted that the pseudo damage value is calculated based on the fatigue characteristics and load history of the material, and is used to evaluate the degree of damage to the material under specific load conditions. The load amplitude is the amplitude of the load change in the load history, and is one of the important factors in evaluating the impact of the load on material damage.

[0128] It can be understood that the load frequency distribution under different load ranges and load means can be determined based on the two-dimensional rainflow histogram, and the pseudo-damage value and load amplitude of each load block (i.e., the load cycle under each load range and mean combination) can be further determined in combination with the load data matrix.

[0129] In a feasible implementation, step S302 may include: dividing the two-dimensional rain flow histogram into a number of regions; obtaining a load threshold of each region, and dividing the load data matrix into a number of load blocks according to the load threshold; obtaining load range information and a corresponding number of cycles in each load block; determining a pseudo-damage value of each load block according to the load range information and the corresponding number of cycles in each load block; and determining a load amplitude of each load block according to the load threshold of each region.

[0130] It should be noted that, taking the X direction as an example, in the two-dimensional rain flow map Range_Mean, the two-dimensional rain flow map is divided into m blocks according to the test requirements, m is 3, and the upper limit value Range_m (m=1, 2, 3) of the load range of the count data in each block area is read, and the load data matrix is ​​divided into 3 load blocks by Range_m, such as Figure 5 As shown, Figure 5 The schematic diagram of the two-dimensional rain flow statistics block in the X direction is shown in Figure 2. The pseudo damage value D of each load block is calculated. bin_x_m , as follows:

[0131]

[0132] Among them, D bin_x_m is the pseudo damage value of each load block, Range i is the payload range information included in each block (i=1, 2, ... 64), N i Range is the load range i The corresponding number of cycles, b is the slope of the SN curve used in the pseudo damage analysis, which is 7, and C is the intercept of the SN curve used in the pseudo damage analysis, which is 1000000.

[0133] It can be understood that according to the upper limit value Range_m of the load range multiplied by the coefficient k (value range 0.5-0.9), the initial value is 0.8, and R BLOCK_x_m (m=1,2,3) is used as the load range of the gantry block spectrum, and then the load amplitude S of the block spectrum can be calculated. BLOCK_x_m , as follows:

[0134]

[0135] Among them, S BLOCK_x_m is the load amplitude, R BLOCK_x_m is the load range.

[0136] Step S303: determining a single cycle load and a corresponding number of cycles according to the pseudo damage value and the load amplitude of each load block.

[0137] It should be noted that a single load cycle refers to the complete load cycle that a material undergoes under a specific load amplitude, which includes the load rise and fall process. The corresponding number of cycles refers to the number of times the material experiences the single load cycle during testing or actual use.

[0138] In a feasible implementation, step S303 may include: obtaining the load mean of each load block, and determining the single cycle load based on the load mean and load amplitude of each load block; obtaining the pseudo-damage value of the single cycle load; and determining the number of cycles of the single cycle load based on the pseudo-damage values ​​of each load block and the pseudo-damage value of the single cycle load.

[0139] It should be noted that in the two-dimensional rain flow histogram Range_Mean, the median of the mean of the ordinates of each block area is used as the load mean S of the block spectrum. mean_x_m ,like Figure 6 As shown, Figure 6 The figure is a schematic diagram of the average value of the two-dimensional rain flow statistics in the X direction. Then, the maximum and minimum values ​​of the load in each area can be calculated, and the maximum value is S max_x_m =S mean_x_m +S BLOCK_x_m , the minimum value is S min_x_m =S mean_x_m -S B LOCK _ x _ m.

[0140] It can be understood that in the data processing software Ncode, according to the load amplitude S BLOCK_x_m and mean load mean S mean_x_m Create a single cyclic load F with a symmetrical cyclic pattern BLOCK_x_m , and then calculate the single cycle load F BLOCK_x_m The pseudo damage value D block_x_m , according to the pseudo damage value D of each load block bin_x_m With single cycle load F BLOCK_x_m The pseudo damage value D block_x_m The number of cycles corresponding to a single cyclic load in different regions of the block spectrum can be calculated as follows:

[0141]

[0142] Among them, N BLOCK_x_m is the number of cycles corresponding to a single cyclic load, D block_x_mis a single cycle load F BLOCK_x_m The pseudo damage value, D bin_x_m is the pseudo damage value of each load block.

[0143] Step S304: determining a target bench load spectrum according to the single cycle load and the number of cycles.

[0144] It should be noted that according to the load range R of the load block BLOCK_x_m The number of cycles N corresponding to a single cycle load BLOCK_x_m Calculate and obtain the pseudo damage value D of the three-level BLOCK load spectrum in the X direction block_x , as follows:

[0145]

[0146] Among them, D block_x is the pseudo damage value of the three-level BLOCK load spectrum in the X direction, R BLOCK_x_m is the load range of the load block, N BLOCK_x_m is the number of cycles that a single cyclic load should correspond to.

[0147] The PotentialDamage module is used in the data processing software Ncode to combine the road load spectrum Road sum The total pseudo-damage calculation of random load in the time domain is performed. For metal materials, the slope of the SN curve for relative pseudo-damage calculation is taken as 7, and the pseudo-damage values ​​D in the X, Y, and Z directions are obtained respectively. sum_x , D sum_y , D sum_z .

[0148] The pseudo damage value D in the X direction of the combined road load spectrum sum_x Pseudo damage value D of the three-level BLOCK load spectrum in the X direction block_x Compare, if the ratio of the two is between 0.95-1.05, then it is determined that F BLOCK_x_m Combined road load spectrumRoad sum Equivalent, and the number of cycles N corresponding to a single cycle load BLOCK_x_m Extend to Y and Z directions N BLOCK_y_m 、N BLOCK_z_m If D sum_x With D block_x If the ratio is outside the range of 0.95-1.05, it is judged as not equivalent, and the load amplitude S is adjusted. BLOCK_x_m and load mean S mean_x_m Recalculate the single cycle load F BLOCK_x_m .

[0149] In F BLOCK_x_m Combined road load spectrumRoad sumWhen equivalent, according to the single cycle load F BLOCK_x_m And the corresponding number of cycles N BLOCK_x_m Determine the cyclic load F in three directions BLOCK_m And the corresponding number of cycles N BLOCK_m , and then the three-axis three-level BLOCK rig load spectrum F can be generated BLOCK_sum , that is, the target bench load spectrum, as follows:

[0150]

[0151] Among them, F BLOCK_sum is the load spectrum of the three-axis three-level BLOCK rig, F BLOCK_m is the cyclic load in three directions, N BLOCK_m is the number of cycles in three directions.

[0152] In this embodiment, by determining a two-dimensional rain flow histogram and a load data matrix based on the combined road load spectrum, the pseudo-damage value and load amplitude of each load block are determined, and then the single cycle load and the corresponding number of cycles are determined. The target test bench load spectrum is determined based on the single cycle load and the corresponding number of cycles, which can effectively improve the accuracy of the test bench load spectrum and thereby improve the test efficiency.

[0153] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the vehicle durability bench test method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0154] This application also provides a vehicle durability bench test device, please refer to Figure 7 , the vehicle durability bench test device comprises:

[0155] The determination module 10 is used to determine the target tow hook load data according to the tow hook load data at various loading levels when the vehicle is on different road types.

[0156] The determination module 10 is further configured to determine a combined road load spectrum according to the target towing hook load data.

[0157] The determination module 10 is further configured to determine a target test bench load spectrum according to the combined road load spectrum.

[0158] The test module 20 is used to perform a durability bench test of the towing hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result.

[0159] The present embodiment provides a vehicle durability bench test device, which can effectively improve the efficiency of the vehicle durability bench test by first determining target tow hook load data based on the tow hook load data of the vehicle at various loading levels when on different road types; determining a combined road load spectrum based on the target tow hook load data; determining a target bench load spectrum based on the combined road load spectrum; and performing a durability bench test of the tow hook based on the target bench load spectrum and the combined road load spectrum to obtain test results.

[0160] In summary, this embodiment determines the target tow hook load data based on the tow hook load data at various loading levels when the vehicle is on different road types, and then determines the combined road load spectrum and the target bench load spectrum and conducts a durability bench test on the tow hook. This overcomes the technical defect of low efficiency of the existing durability bench test and can effectively improve the efficiency of the vehicle durability bench test.

[0161] Optionally, the determination module 10 is further used to collect trailer load data of the vehicle at various loading levels when on different road types; determine actual pseudo-damage values ​​and pseudo-damage means of different road types based on the trailer load data; and determine target trailer load data in the trailer load data based on the actual pseudo-damage values ​​and pseudo-damage means of the different road types.

[0162] Optionally, the determination module 10 is also used to determine a two-dimensional rain flow histogram and a load data matrix based on the combined road load spectrum; determine the pseudo-damage value and the load amplitude of each load block based on the two-dimensional rain flow histogram and the load data matrix; determine the single cycle load and the corresponding number of cycles based on the pseudo-damage value and the load amplitude of each load block; determine the target test bench load spectrum based on the single cycle load and the number of cycles.

[0163] Optionally, the determination module 10 is further used to generate a rain flow matrix according to the combined road load spectrum; generate a two-dimensional rain flow histogram according to the rain flow matrix; determine rainfall statistics according to the two-dimensional rain flow histogram; and determine a load data matrix according to the rainfall statistics.

[0164] Optionally, the determination module 10 is also used to divide the two-dimensional rainflow histogram into several areas; obtain the load threshold of each area, and divide the load data matrix into several load blocks according to the load threshold; obtain the load range information and the corresponding number of cycles in each load block; determine the pseudo-damage value of each load block according to the load range information and the corresponding number of cycles in each load block; determine the load amplitude of each load block according to the load threshold of each area.

[0165] Optionally, the determination module 10 is also used to obtain the load mean of each load block, and determine the single cycle load based on the load mean and load amplitude of each load block; obtain the pseudo-damage value of the single cycle load; and determine the number of cycles of the single cycle load based on the pseudo-damage values ​​of each load block and the pseudo-damage value of the single cycle load.

[0166] Optionally, the test module 20 is also used to construct a finite element simulation model of the towing hook and the towing beam; determine the unit load stress of the towing hook according to the finite element simulation model; determine the first real damage value and the second real damage value of the towing hook according to the unit load stress of the towing hook, the target bench load spectrum and the combined road load spectrum; determine whether the target bench load spectrum and the combined road load spectrum are equivalent according to the first real damage value and the second real damage value; when they are equivalent, perform a durability bench test according to the target bench load spectrum to obtain a test result.

[0167] The vehicle durability bench test device provided by the present application adopts the vehicle durability bench test method in the above embodiment, and can solve the technical problem of how to effectively improve the efficiency of the vehicle durability bench test. Compared with the prior art, the beneficial effects of the vehicle durability bench test device provided by the present application are the same as the beneficial effects of the vehicle durability bench test method provided by the above embodiment, and the other technical features in the vehicle durability bench test device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0168] The present application provides a vehicle durability bench test equipment, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the vehicle durability bench test method in the above-mentioned embodiment one.

[0169] Reference below Figure 8 , which shows a schematic diagram of the structure of a vehicle durability bench test device suitable for implementing the embodiment of the present application. The vehicle durability bench test device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 8The vehicle durability bench test equipment shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0170] like Figure 8 As shown, the vehicle durability bench test equipment may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. Various programs and data required for the operation of the vehicle durability bench test equipment are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 may allow the vehicle durability bench test equipment to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a vehicle durability bench test equipment with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have instead.

[0171] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0172] The vehicle durability bench test equipment provided by the present application adopts the vehicle durability bench test method in the above embodiment, which can solve the technical problem of how to effectively improve the efficiency of the vehicle durability bench test. Compared with the prior art, the beneficial effects of the vehicle durability bench test equipment provided by the present application are the same as the beneficial effects of the vehicle durability bench test method provided by the above embodiment, and the other technical features in the vehicle durability bench test equipment are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0173] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0174] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0175] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the vehicle durability bench test method in the above-mentioned embodiment.

[0176] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0177] The computer-readable storage medium may be included in the vehicle durability test bench device; or may exist independently without being assembled into the vehicle durability test bench device.

[0178] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the vehicle durability bench test equipment, the vehicle durability bench test equipment: determines the target tow hook load data according to the tow hook load data of the vehicle at various loading levels when on different road types; determines the combined road load spectrum according to the target tow hook load data; determines the target bench load spectrum according to the combined road load spectrum; performs a durability bench test of the tow hook according to the target bench load spectrum and the combined road load spectrum to obtain the test results.

[0179] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0180] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0181] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0182] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned vehicle durability bench test method, and can solve the technical problem of how to effectively improve the efficiency of the vehicle durability bench test. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the vehicle durability bench test method provided in the above-mentioned embodiment, and will not be repeated here.

[0183] The present application also provides a computer program product, including a computer program, which implements the steps of the vehicle durability bench test method as described above when executed by a processor.

[0184] The computer program product provided by the present application can solve the technical problem of how to effectively improve the efficiency of the vehicle durability bench test. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the vehicle durability bench test method provided by the above embodiment, which will not be repeated here.

[0185] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A vehicle durability bench test method, characterized in that: The method comprises: Determining target tow hook load data according to tow hook load data at various loading levels when the vehicle is on different road types, wherein the target tow hook load data is acquired by a three-axial force sensor; Determining a combined road load spectrum according to the target tow hook load data; Determine a target test bench load spectrum according to the combined road load spectrum, wherein the target test bench load spectrum is a three-axis three-level block test bench load spectrum; Performing a durability bench test on the towing hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result; The step of determining a target test bench load spectrum according to the combined road load spectrum comprises: Determining a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum; Determining the pseudo damage value and the load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix; Determine a single cycle load and a corresponding number of cycles according to the pseudo damage value and load amplitude of each load block; Determining a target bench load spectrum according to the single cycle load and the number of cycles; The determining of the pseudo damage value and the load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix includes: Dividing the two-dimensional rain flow histogram into a plurality of regions; Obtaining a load threshold value of each area, and dividing the load data matrix into a plurality of load blocks according to the load threshold value; Obtain the load range information and corresponding cycle number in each load block; Determine the pseudo damage value of each load block according to the load range information and the corresponding number of cycles in each load block; The load amplitude of each load block is determined according to the load threshold of each area.

2. The method according to claim 1, characterized in that The step of determining the target tow hook load data according to the tow hook load data at each loading level of the vehicle on different road types includes: Collect the trailer load data of the vehicle at various loading levels on different road types; Determining actual pseudo damage values ​​and pseudo damage means for different road surface types according to the tow hook load data; The target hook load data in the hook load data is determined according to the actual pseudo damage values ​​and the pseudo damage mean values ​​of the different road types.

3. The method according to claim 1, characterized in that Determining a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum includes: generating a rain flow matrix according to the combined road load spectrum; generating a two-dimensional rain flow histogram according to the rain flow matrix; Determining rainfall statistics results according to the two-dimensional rain flow histogram; A load data matrix is ​​determined according to the rainfall statistics results.

4. The method according to claim 1, characterized in that The determining of a single cycle load and a corresponding number of cycles according to the pseudo damage value and the load amplitude of each load block comprises: Obtaining a load mean value of each load block, and determining a single cycle load according to the load mean value and load amplitude of each load block; Obtaining a pseudo damage value of the single cycle load; The number of cycles of the single cycle load is determined according to the pseudo damage values ​​of the load blocks and the pseudo damage value of the single cycle load.

5. The method according to claim 1, characterized in that The durability bench test of the tow hook is performed according to the target bench load spectrum and the combined road load spectrum to obtain the test result, including: Construct finite element simulation model of towing hook and towing beam; Determining the unit load stress of the towing hook according to the finite element simulation model; Determine a first real damage value and a second real damage value of the towing hook according to the unit load stress of the towing hook, the target bench load spectrum and the combined road load spectrum, wherein the first real damage value is the maximum real damage value of the towing hook under the combined road load spectrum, and the second real damage value is the maximum real damage value of the towing hook under the target bench load spectrum; Determining whether the target bench load spectrum and the combined road load spectrum are equivalent according to the first true damage value and the second true damage value; When equivalent, a durability bench test is performed according to the target bench load spectrum to obtain a test result.

6. A vehicle durability bench test device, characterized in that: The vehicle durability bench test device comprises: A determination module, used to determine target tow hook load data according to tow hook load data at various loading levels when the vehicle is on different road types, wherein the target tow hook load data is collected by a three-axial force sensor; The determination module is further used to determine a combined road load spectrum according to the target towing hook load data; The determination module is further used to determine a target test bench load spectrum according to the combined road load spectrum, wherein the target test bench load spectrum is a three-axis three-level block test bench load spectrum; A test module, used for performing a durability bench test of the towing hook according to the target bench load spectrum and the combined road load spectrum to obtain a test result; The determination module is further used to determine a two-dimensional rain flow histogram and a load data matrix according to the combined road load spectrum; determine the pseudo damage value and the load amplitude of each load block according to the two-dimensional rain flow histogram and the load data matrix; determine a single cycle load and a corresponding number of cycles according to the pseudo damage value and the load amplitude of each load block; determine a target bench load spectrum according to the single cycle load and the number of cycles; The determination module is also used to divide the two-dimensional rain flow histogram into several areas; obtain the load threshold of each area, and divide the load data matrix into several load blocks according to the load threshold; obtain the load range information and the corresponding number of cycles in each load block; determine the pseudo damage value of each load block according to the load range information and the corresponding number of cycles in each load block; determine the load amplitude of each load block according to the load threshold of each area.

7. A vehicle durability bench test equipment, characterized in that: The vehicle durability bench test equipment comprises: a memory, a processor, and a vehicle durability bench test program stored in the memory and executable on the processor, wherein the vehicle durability bench test program is configured to implement the vehicle durability bench test method according to any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores a vehicle durability bench test program, and when the vehicle durability bench test program is executed by the processor, the vehicle durability bench test method according to any one of claims 1 to 5 is implemented.

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