A system, method, and apparatus for rapidly converting wheel fatigue equivalent damage

Abstract

A system, method, and apparatus for rapidly converting wheel fatigue equivalent damage are disclosed. The system includes a road spectrum acquisition module, a load screening module, a simulation analysis module, an equivalent conversion module, and a load spectrum synthesis module. The corresponding apparatus includes a real vehicle road spectrum acquisition unit, a storage unit, a data processing unit, and a loading control unit. Using a pre-constructed wheel finite element simulation model, the fatigue damage caused to the wheel by excessively high load pairs is rapidly calculated using the unit load method. Based on the damage equivalence principle, the total damage of the excessively high load pairs is equivalently converted into load pairs that can be loaded by the testing machine, ultimately synthesizing a complete test load spectrum. This invention solves the problems of damage loss due to deleting large loads and inaccurate equivalence due to simple load scaling in existing technologies. While ensuring the testing machine can load the loads, it completely preserves the fatigue damage of all loads in the real vehicle road spectrum, while significantly improving the efficiency of load spectrum conversion, effectively improving the accuracy and reliability of wheel fatigue testing.

Description

Technical Field

[0001] This invention relates to the field of wheel fatigue testing technology, specifically to a system, method, and apparatus for rapidly converting wheel fatigue equivalent damage. Background Technology

[0002] As a key component of a car in contact with the ground, the fatigue durability of the wheels directly affects the driving safety of the entire vehicle. Mainstream wheel fatigue tests typically require first collecting six-component force data of the wheels through real-vehicle road tests to obtain a true road load spectrum (referred to as road spectrum), and then replicating this road spectrum on a fatigue testing machine to reproduce the damage process of the real vehicle in a laboratory environment.

[0003] Currently, due to the addition of battery packs, new energy vehicles generally experience greater wheel loads compared to traditional gasoline vehicles. During actual driving, when vehicles encounter bumpy roads, speed bumps, potholes, and other special conditions, the wheels bear significantly greater instantaneous loads than gasoline-powered vehicles. However, fatigue testing machines have an upper limit on the loading friction force. Limited by the maximum output force of the actuators and the frictional bearing capacity of the transmission mechanism, the radial and axial loads that the testing machine can stably load are both limited in maximum value. These large load pairs (combinations of radial and axial loads) often exceed the loading limit of the testing machine and cannot be directly applied. To address this issue, existing technologies typically employ two methods:

[0004] 1. Directly removing loads exceeding the upper limit: Large loads exceeding the testing machine's loading limit are directly removed from the load spectrum, retaining only loadable small and medium loads. However, although large loads occur very infrequently, their contribution to fatigue damage is significant. According to Miner's linear cumulative damage theory and the nonlinear characteristics of the fatigue SN curve, damage caused by large loads can account for more than 30% of the total damage. Removing these large loads will significantly reduce the total damage in the test, making the test results overly optimistic. This could lead to wheels that pass the laboratory test experiencing premature fatigue failure during actual use due to the effects of large loads, posing a serious safety hazard.

[0005] 2. Proportional scaling of all loads: All loads in the entire load spectrum are scaled down by the same proportion, reducing all loads to within the loading range of the testing machine, while the corresponding number of cycles is proportionally increased. This method is feasible in uniaxial fatigue tests, but in multiaxial fatigue cases, the fatigue damage of the wheel is not simply linearly related to the radial and axial loads. Proportional scaling of the loads and the number of cycles affects the correlation between stress and the number of cycles, resulting in an underestimation of the equivalent fatigue damage and failing to accurately reproduce the actual damage of the vehicle.

[0006] In addition, although there are existing methods for calculating wheel fatigue damage through finite element simulation, these methods usually require a complete finite element calculation for each load condition, which is extremely inefficient and cannot quickly process a large amount of load data in the actual vehicle road spectrum, making it difficult to meet the engineering requirements for rapid conversion of load spectrum.

[0007] Therefore, in response to the technical problems existing in the prior art, when wheel fatigue testing, large loads in the actual vehicle road spectrum exceed the upper limit of the friction force that the testing machine can apply, resulting in the inability to apply loads. Existing processing methods either lose the fatigue damage caused by large loads or the equivalent conversion is inaccurate and inefficient. There is an urgent need for a system and device that can quickly and accurately calculate the damage caused by large loads exceeding the upper limit and convert them into equivalent loads that the testing machine can apply, so as to achieve rapid conversion of the load spectrum without losing the damage. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a system and method for rapidly converting wheel fatigue equivalent damage. This system converts road load spectra collected from actual vehicles into test load spectra that can be loaded by laboratory fatigue testing machines, thus solving the problem of fatigue damage loss caused by the inability to load large loads.

[0009] According to one aspect of the present invention, a system for rapidly converting wheel fatigue equivalent damage is provided, comprising:

[0010] The road spectrum acquisition module is used to collect the six-component force data of the wheels during the actual vehicle driving process, extract the radial load and axial load, and generate the original load spectrum containing the load pair sequence.

[0011] The load screening module is used to obtain the upper limit parameter of the loading friction force of the fatigue testing machine as the upper limit of the load, and to screen all load pairs in the original load spectrum, dividing the load pairs into regular load pairs that can be directly loaded without exceeding the upper limit of the load, and super upper limit large load pairs that exceed the upper limit of the load.

[0012] The simulation analysis module is used to perform fatigue damage calculation on the above-limit load pairs based on the pre-built wheel finite element simulation model, to obtain the unit cycle fatigue damage corresponding to each above-limit load pair, and the total fatigue damage of all above-limit load pairs.

[0013] The equivalent conversion module is used to convert the total fatigue damage of the above-limit large load pair into an equivalent load pair that does not exceed the loading limit, based on the fatigue damage equivalence principle, so that the total fatigue damage before and after equivalence is consistent.

[0014] The load spectrum synthesis module is used to synthesize the conventional load pair and the equivalent load pair to generate the target test load spectrum, which is then output to the fatigue testing machine.

[0015] Preferably, the system further includes a damage verification module for verifying the total damage of the synthesized target test load spectrum, so that the error between the total damage and the original load spectrum is less than a predetermined value.

[0016] According to another aspect of the present invention, a method for rapidly converting wheel fatigue equivalent damage is provided, characterized by being implemented using the aforementioned system for rapidly converting wheel fatigue equivalent damage, comprising the following steps:

[0017] Real vehicle road spectrum acquisition is used to collect the six-component force data of the wheels during the actual vehicle driving process, extract the radial load and axial load, and generate the original load spectrum containing the load pair sequence;

[0018] Load screening is used to obtain the upper limit parameter of the loading friction force of the fatigue testing machine as the upper limit of the loading. All load pairs in the original load spectrum are screened and divided into regular load pairs that do not exceed the upper limit of the loading and can be directly loaded, and super upper limit load pairs that exceed the upper limit of the loading.

[0019] Simulation and damage calculation are used to perform fatigue damage calculation on the above-limit load pairs based on the pre-built wheel finite element simulation model, to obtain the unit cycle fatigue damage corresponding to each above-limit load pair, and the total fatigue damage of all above-limit load pairs.

[0020] Equivalent conversion is used to convert the total fatigue damage of the above-limit large load pair into an equivalent load pair that does not exceed the loading limit, based on the fatigue damage equivalence principle, so that the total fatigue damage before and after equivalence is consistent.

[0021] Load spectrum synthesis is used to synthesize the conventional load pairs and the equivalent load pairs to generate the target test load spectrum, which is then output to the fatigue testing machine.

[0022] Preferably, the simulation and damage calculation steps include:

[0023] A finite element simulation model of the target wheel is pre-built, meshed, and material parameters and boundary conditions are set.

[0024] By applying unit radial load and unit axial load respectively, the stress response matrix of the critical dangerous parts of the wheel under unit load is calculated.

[0025] For each pair of loads exceeding the upper limit, the stress state of the critical dangerous parts of the wheel under the action of each pair of loads exceeding the upper limit is obtained by linear superposition based on the unit load stress response matrix.

[0026] Based on the fatigue damage model and the SN curve of the wheel material, the unit cycle fatigue damage corresponding to each maximum load exceeding the upper limit was calculated.

[0027] The unit load stress response matrix includes: radial stress and axial stress of critical dangerous parts of the wheel under unit radial load, and radial stress and axial stress of critical dangerous parts of the wheel under unit axial load, which are used to calculate the stress state under any load.

[0028] Preferably, the equivalent conversion step includes:

[0029] For each pair of loads exceeding the upper limit, the load amplitude of each pair of loads exceeding the upper limit is reduced to within the loading range according to the upper limit of the testing machine, so as to obtain the equivalent load pair to be matched;

[0030] Based on the nonlinear characteristics of fatigue damage, the number of cycles corresponding to the equivalent load pair is adjusted so that the total damage of the adjusted equivalent load pair is equal to the total damage of the original over-limit load pair.

[0031] After making the above adjustments to all load pairs exceeding the upper limit, all equivalent load pairs are generated.

[0032] Preferably, the equivalent conversion process satisfies the following formula:

[0033]

[0034] in, This represents the number of cycles for the original overload pair. , For the radial and axial loads of the original over-limit load pair, This is a function for calculating multiaxial fatigue damage. The number of cycles for the equivalent load pair. , For the equivalent radial and axial loads, satisfy , ,in , This represents the upper limit of the radial and axial loads on the testing machine.

[0035] According to another aspect of the present invention, a device for rapidly converting wheel fatigue equivalent damage is provided, characterized in that it comprises:

[0036] The real vehicle road spectrum acquisition unit includes a six-component force sensor and a data acquisition instrument installed on the test vehicle, which are used to collect the wheel six-component force data during the actual vehicle driving process and extract the radial load and axial load;

[0037] The storage unit is used to store the pre-built wheel finite element simulation model, unit load stress response matrix, fatigue damage model, SN curve of wheel material, and loading parameters of fatigue testing machine;

[0038] The data processing unit is connected to the actual vehicle road spectrum acquisition unit and the storage unit, and is used to execute the module functions of the above system or the above methods to complete load screening, damage calculation, equivalent conversion and load spectrum synthesis.

[0039] The loading control unit, connected to the data processing unit and the fatigue testing machine, is used to output the synthesized target test load spectrum to the testing machine and control the testing machine to load according to the target load spectrum.

[0040] Preferably, the sampling frequency of the real vehicle road spectrum acquisition unit is not less than 500Hz in order to fully acquire the peak data of instantaneous high load.

[0041] According to another aspect of the present invention, a computer-readable storage medium is provided, characterized in that the storage medium stores a plurality of instructions; the plurality of instructions are used by a processor to load and execute the above-described method.

[0042] According to another aspect of the present invention, a computer program product is provided, comprising a computer program, characterized in that the computer program implements the above-described method when executed by a processor.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] Complete preservation of high load damage improves test accuracy: This invention no longer deletes high loads exceeding the upper limit, but accurately calculates the damage caused by them through simulation, and then transfers the damage equivalently to the load that can be applied, thus completely preserving the fatigue damage of high loads. This avoids the problem of overly optimistic test results, effectively improves the accuracy of wheel fatigue tests, and avoids the risk of premature failure in actual use.

[0045] Rapid simulation calculation for efficient conversion: This invention adopts the unit load method to pre-calculate the stress response under a unit load. Subsequently, for large loads, the stress state can be quickly obtained by linear superposition, without the need for complete finite element calculations for each large load. This improves the efficiency of simulation calculation by more than two orders of magnitude, realizes rapid conversion of load spectra, and meets the efficiency requirements of engineering applications.

[0046] Fatigue damage equivalence ensures conversion accuracy: This invention performs equivalent conversion based on a fatigue damage model, rather than simple load scaling, ensuring that the damage before and after equivalence is completely consistent, avoiding damage deviation caused by changes in load ratio, resulting in higher conversion accuracy and an error controllable within 0.5%.

[0047] High versatility and adaptability: This invention can be adapted to different models of wheels and fatigue testing machines with different parameters. Only the corresponding wheel simulation model and the upper limit parameters of the testing machine need to be modified to automatically complete the conversion of the load spectrum. There is no need to redevelop the algorithm, which makes it highly versatile. Attached Figure Description

[0048] Figure 1 This is a flowchart of the rapid conversion method of the present invention;

[0049] Figure 2 This is a system module block diagram of the present invention;

[0050] Figure 3 This is a schematic diagram of the finite element simulation model of the wheel in this invention. Detailed Implementation

[0051] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The exemplary embodiments described below and illustrated in the drawings are intended to teach the principles of the invention, enabling those skilled in the art to implement and use the invention in various environments and for various applications. Therefore, the scope of protection of the present invention is defined by the appended claims, and the exemplary embodiments are not intended, and should not be considered, a limiting description of the scope of protection of the present invention. Furthermore, for ease of description, the dimensions of the various parts shown in the drawings are not necessarily drawn to actual scale. Orientation descriptions, such as radial directions corresponding to the direction perpendicular to the wheel axis, and orientations or positional relationships indicated by up, down, left, right, top, bottom, etc., are based on the orientations or positional relationships shown in the drawings and are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise specifically stated, the order and numerical values ​​of the components and assembly steps set forth in the embodiments do not limit the scope of the present invention. Moreover, any numerical range stated herein is intended to include all sub-ranges contained therein, and a numerical range expressed as "numerical value A to numerical value B" refers to a range including endpoints numerical values ​​A and B. Those skilled in the art will understand that the terms "nth" and "Sn" in this invention are used only to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0052] <Exemplary System>

[0053] like Figure 2 As shown, the present invention provides a system for rapidly converting wheel fatigue equivalent damage, comprising:

[0054] Road spectrum acquisition module: used to collect wheel six-component force data during actual vehicle driving, extract radial load and axial load, and generate original load spectrum containing load pair sequence;

[0055] Load screening module: Used to obtain the upper limit parameter of the loading friction force of the fatigue testing machine as the upper limit of the loading, screen all load pairs in the original load spectrum, and divide the load pairs into conventional load pairs that do not exceed the upper limit of the loading and can be directly loaded, and super upper limit large load pairs that exceed the upper limit of the loading.

[0056] Simulation analysis module: Based on the pre-built wheel finite element simulation model, it performs rapid fatigue damage calculation on the above-limit load pairs, and obtains the unit cycle fatigue damage corresponding to each above-limit load pair, as well as the total fatigue damage of all above-limit load pairs.

[0057] Equivalent conversion module: Based on the principle of fatigue damage equivalence, the total fatigue damage of the above-limit large load pair is equivalently converted into an equivalent load pair that does not exceed the loading limit, ensuring that the total fatigue damage before and after equivalence is consistent;

[0058] Load spectrum synthesis module: used to synthesize the conventional load pair and the equivalent load pair to generate the target test load spectrum and output it to the fatigue testing machine.

[0059] Furthermore, the simulation analysis module is specifically used for:

[0060] A finite element simulation model of the target wheel and the tires used is pre-established, and the mesh is generated and material parameters and boundary conditions are set.

[0061] By applying unit radial load and unit axial load respectively, the stress response matrix of the critical dangerous parts of the wheel under unit load is calculated.

[0062] For each pair of loads exceeding the upper limit, the multiaxial stress state of the critical dangerous parts of the wheel under the action of each pair of loads exceeding the upper limit is obtained by linear superposition based on the unit load stress response matrix.

[0063] Based on the fatigue damage model and combined with the SN curve of the wheel material, the unit cycle fatigue damage corresponding to each maximum load exceeding the upper limit is calculated.

[0064] Furthermore, the unit load stress response matrix includes: radial stress and axial stress of critical dangerous parts of the wheel under unit radial load, and radial stress and axial stress of critical dangerous parts of the wheel under unit axial load, which are used to realize the rapid calculation of stress state under any load.

[0065] Furthermore, the equivalent conversion module is specifically used for:

[0066] Based on the upper limit of the testing machine's load, the load amplitude of each load pair exceeding the upper limit is reduced to within the loading range to obtain the equivalent load pair to be matched. Here, the loading range refers to the allowable load variation range below the upper limit of the testing machine's load.

[0067] Based on the nonlinear characteristics of multiaxial fatigue damage, the number of cycles corresponding to the equivalent load pair is adjusted so that the total damage of the adjusted equivalent load pair is equal to the total damage of the original over-limit load pair.

[0068] After making the above adjustments to all load pairs exceeding the upper limit, all equivalent load pairs are generated.

[0069] Furthermore, the equivalent transformation process satisfies the following formula:

[0070]

[0071] in, This represents the number of cycles for the original overload pair. , For the radial and axial loads of the original over-limit load pair, This is a function for calculating multiaxial fatigue damage. The number of cycles for the equivalent load pair. , For the equivalent radial and axial loads, satisfy , ,in , This represents the upper limit of the radial and axial loads on the testing machine.

[0072] Furthermore, the system also includes a damage verification module, which verifies the total damage of the synthesized target test load spectrum to ensure that the error between the total damage of the synthesized target test load spectrum and the original load spectrum is less than a predetermined value, for example, 0.5%.

[0073] <Exemplary device>

[0074] Correspondingly, the present invention also provides a device for rapidly converting wheel fatigue equivalent damage, comprising:

[0075] Real vehicle road spectrum acquisition unit: including a six-component force sensor and a data acquisition instrument installed on the test vehicle, used to collect wheel six-component force data during the actual vehicle driving process and extract radial load and axial load;

[0076] Storage unit: Used to store pre-built wheel finite element simulation models, unit load stress response matrices, fatigue damage models, SN curves of wheel materials, and loading parameters of fatigue testing machines;

[0077] Data processing unit: connected to the actual vehicle road spectrum acquisition unit and storage unit, used to execute the functions of each module of the above system, and complete load screening, fast damage calculation, equivalent conversion and load spectrum synthesis;

[0078] Loading control unit: connected to the data processing unit and fatigue testing machine, used to output the synthesized target test load spectrum to the testing machine and control the testing machine to load according to the target load spectrum.

[0079] Furthermore, the sampling frequency of the real vehicle road spectrum acquisition unit is not less than 500Hz to ensure that peak data of instantaneous high load can be completely acquired.

[0080] <Exemplary Method>

[0081] The method for rapidly converting wheel fatigue equivalent damage provided by the present invention will be described in detail below through specific embodiments.

[0082] This embodiment uses the fatigue test load spectrum conversion of a 20-inch aluminum alloy passenger car wheel as an example to provide a detailed description of the system, device, and corresponding method of the present invention.

[0083] Step S1: Real vehicle road spectrum collection

[0084] The actual vehicle road spectrum acquisition unit of the device of this invention installs six-component force sensors on the wheels of the test vehicle and conducts road tests at the test track to collect wheel six-component force data on different road surfaces (including highways, Belgian roads, speed bump roads, bumpy roads, etc.). The sampling frequency is set to 500Hz, and a total of 1000km of test track road surface data is collected, which is equivalent to 300,000km of driving mileage in user scenarios. Radial load is extracted from the six-component force data. With axial load The original load spectrum was generated, which contained 12,000 load pair sequences.

[0085] The upper limit of the applied friction force of the fatigue testing machine used in this experiment is: maximum radial load. Maximum axial load That is, only when the condition is satisfied and Only when the load pairs are properly matched can the testing machine stably apply the loads.

[0086] Step S2: Load Screening

[0087] The load screening module filters all load pairs in the original load spectrum. First, it counts all load pairs and their cycle counts using the rainflow counting method. Then, it filters based on the upper limit of the testing machine's load capacity.

[0088] Conventional load pairs: 11985 in total, all of which meet the requirements. and It can be loaded directly;

[0089] There are 15 load pairs exceeding the upper limit. The radial load of these load pairs is between 11.2 and 13.5 kN, and the axial load is between 5.2 and 6.8 kN. All of them exceed the upper limit of the testing machine and cannot be directly applied.

[0090] Step S3: Large load simulation damage calculation, which may include the following sub-steps 1 and 2, where sub-step 1 can also be preset separately.

[0091] Sub-step 1: Pre-build simulation model and unit load response

[0092] A finite element simulation model was pre-established for the 20-inch aluminum alloy wheel, such as... Figure 3 As shown, the geometry of the wheel is meshed into 125,632 elements. The elastic modulus of the aluminum alloy material is set to 71 GPa and the Poisson's ratio to 0.33. The boundary conditions constrain the degrees of freedom of the wheel's mounting surface.

[0093] Then, a unit radial load (1kN) and a unit axial load (1kN) were applied respectively, and finite element analysis was performed to obtain the stress distribution of the wheel. The critical and dangerous part of the wheel was identified as the area near the bolt holes, and the stress response per unit load at this part was extracted.

[0094] Radial stress at this location under a unit radial load axial stress ;

[0095] Radial stress at this location under unit axial load axial stress .

[0096] The unit load stress response matrix is ​​stored in a storage unit for subsequent rapid damage calculation.

[0097] Sub-step 2: Rapid damage calculation under heavy load

[0098] For the 15 selected pairs of loads exceeding the upper limit, rapid damage calculations were performed using the simulation analysis module:

[0099] Taking one typical large load pair as an example, the original load is , Number of loops Second-rate.

[0100] The stress state under this load is obtained by linear superposition of the stress response matrix under unit load:

[0101]

[0102]

[0103] Then, based on the fatigue damage model of multi-axis load projection, the equivalent stress is calculated. Based on the SN curve of this aluminum alloy material, the fatigue index The damage per unit cycle is calculated, i.e., the damage per unit cycle is:

[0104]

[0105] The total damage to this large load pair is: .

[0106] Perform the same calculation on the remaining 14 large load pairs, and the total damage for all large load pairs is: This accounts for 32.7% of the total damage in the original load spectrum, indicating that the damage contribution from large loads is enormous. If it is directly deleted, it will result in the loss of more than 30% of the damage.

[0107] The entire damage calculation process takes only 0.2 seconds because it only requires linear superposition and formula calculation, without the need for finite element solution. Compared with the traditional method of performing finite element calculation for each load, the efficiency is improved by more than 100 times.

[0108] Step S4: Damage Equivalent Conversion

[0109] For each large load pair, an equivalent transformation is performed using the equivalent transformation module:

[0110] Taking the above typical large load pair as an example, its load amplitude is reduced to within the loading range of the testing machine and adjusted to... , ,satisfy , It belongs to the loadable load category.

[0111] Then calculate the unit cyclic damage of this equivalent load:

[0112] First, calculate the stress state:

[0113]

[0114]

[0115] Equivalent stress Unit cyclic damage:

[0116]

[0117] Then, based on the damage equivalence formula, calculate the required number of cycles:

[0118]

[0119] That is, two cycles of the original large load are equivalent to 5.57 cycles of the equivalent load, and the total damage of the two is exactly the same, that is, the total damage is equal.

[0120] The same equivalent transformation was performed on all 15 large load pairs to obtain 15 equivalent load pairs, all of which met the upper limit loading requirements of the testing machine.

[0121] Step S5: Load spectrum synthesis and verification

[0122] The load spectrum synthesis module synthesizes the original 11,985 conventional load pairs with the 15 equivalent load pairs obtained by conversion to generate the final target test load spectrum.

[0123] Then, the total damage of the target test load spectrum was calculated through the damage verification module. The result was 0.003792, while the total damage of the original load spectrum was 0.003803. The error between the two was only 0.29%, which is far less than the consistency requirement of 0.5%, and the equivalent accuracy is extremely high.

[0124] The target load spectrum is output to the fatigue testing machine, which can then complete the loading of all loads, fully reproducing all the damage of the actual vehicle road spectrum and solving the problem of not being able to load large loads.

[0125] <Exemplary computer program products and computer-readable storage media>

[0126] In addition to the methods, systems, and apparatus described above, embodiments of this disclosure may also be computer program products comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of this disclosure as described in the "Exemplary Methods" section of this specification.

[0127] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this disclosure. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on a user's computing device, partially on a user's computing device, as a standalone software package, partially on a user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0128] Furthermore, embodiments of this disclosure may also be computer-readable storage media having computer program instructions stored thereon, which, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of this disclosure described in the "Exemplary Methods" section above.

[0129] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0130] In the description of this application, "a number" means two or more, unless otherwise explicitly specified. Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, and servers, which can operate with a wide variety of other general-purpose or special-purpose computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, etc. Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments where tasks are performed by remote processing devices linked via a communication network. In a distributed cloud computing environment, program modules can reside on local or remote computing system storage media, including storage devices. Although the invention has been described with reference to various specific embodiments, it should be understood that modifications can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the invention be limited to the described embodiments but will have the full scope defined by the language of the appended claims.

Claims

1. A system for rapidly converting wheel fatigue equivalent damage, characterized in that, include: The road spectrum acquisition module is used to collect the six-component force data of the wheels during the actual vehicle driving process, extract the radial load and axial load, and generate the original load spectrum containing the load pair sequence. The load screening module is used to obtain the upper limit parameter of the loading friction force of the fatigue testing machine as the upper limit of the load, and to screen all load pairs in the original load spectrum, dividing the load pairs into regular load pairs that can be directly loaded without exceeding the upper limit of the load, and super upper limit large load pairs that exceed the upper limit of the load. The simulation analysis module is used to perform fatigue damage calculation on the above-limit load pairs based on the pre-built wheel finite element simulation model, to obtain the unit cycle fatigue damage corresponding to each above-limit load pair, and the total fatigue damage of all above-limit load pairs. The equivalent conversion module is used to convert the total fatigue damage of the above-limit large load pair into an equivalent load pair that does not exceed the loading limit, based on the fatigue damage equivalence principle, so that the total fatigue damage before and after equivalence is consistent. The load spectrum synthesis module is used to synthesize the conventional load pair and the equivalent load pair to generate the target test load spectrum, which is then output to the fatigue testing machine.

2. The system according to claim 1, characterized in that, It also includes a damage verification module, which is used to verify the total damage of the synthesized target test load spectrum so that the error between the total damage and the original load spectrum is less than a predetermined value.

3. A method for rapidly converting wheel fatigue equivalent damage, characterized in that, The system for rapidly converting wheel fatigue equivalent damage as described in claim 1 or 2 includes the following steps: Real vehicle road spectrum acquisition is used to collect wheel six-component force data during the actual vehicle driving process, extract radial load and axial load, and generate the original load spectrum containing load pair sequence; Load screening is used to obtain the upper limit parameter of the loading friction force of the fatigue testing machine as the upper limit of the loading. All load pairs in the original load spectrum are screened and divided into regular load pairs that do not exceed the upper limit of the loading and can be directly loaded, and super upper limit load pairs that exceed the upper limit of the loading. Simulation and damage calculation are used to perform fatigue damage calculation on the above-limit load pairs based on the pre-built wheel finite element simulation model, to obtain the unit cycle fatigue damage corresponding to each above-limit load pair, and the total fatigue damage of all above-limit load pairs. Equivalent conversion is used to convert the total fatigue damage of the above-limit large load pair into an equivalent load pair that does not exceed the loading limit, based on the fatigue damage equivalence principle, so that the total fatigue damage before and after equivalence is consistent. Load spectrum synthesis is used to synthesize the conventional load pairs and the equivalent load pairs to generate the target test load spectrum, which is then output to the fatigue testing machine.

4. The method according to claim 3, characterized in that, The simulation and damage calculation steps include: A finite element simulation model of the target wheel is pre-built, meshed, and material parameters and boundary conditions are set. By applying unit radial load and unit axial load respectively, the stress response matrix of the critical dangerous parts of the wheel under unit load is calculated. For each pair of loads exceeding the upper limit, the stress state of the critical dangerous parts of the wheel under the action of each pair of loads exceeding the upper limit is obtained by linear superposition based on the unit load stress response matrix. Based on the fatigue damage model and the SN curve of the wheel material, the unit cycle fatigue damage corresponding to each maximum load exceeding the upper limit was calculated. The unit load stress response matrix includes: radial stress and axial stress of critical dangerous parts of the wheel under unit radial load, and radial stress and axial stress of critical dangerous parts of the wheel under unit axial load, which are used to calculate the stress state under any load.

5. The method according to claim 3, characterized in that, The equivalent conversion steps include: For each pair of loads exceeding the upper limit, the load amplitude of each pair of loads exceeding the upper limit is reduced to within the loading range according to the upper limit of the testing machine, so as to obtain the equivalent load pair to be matched; Based on the nonlinear characteristics of fatigue damage, the number of cycles corresponding to the equivalent load pair is adjusted so that the total damage of the adjusted equivalent load pair is equal to the total damage of the original over-limit load pair. After making the above adjustments to all load pairs exceeding the upper limit, all equivalent load pairs are generated.

6. The method according to claim 5, characterized in that, The equivalent transformation process satisfies the following formula: ， in, This represents the number of cycles for the original overload pair. , For the radial and axial loads of the original over-limit load pair, This is a function for calculating multiaxial fatigue damage. The number of cycles for the equivalent load pair. , For the equivalent radial and axial loads, satisfy , ,in , This represents the upper limit of the radial and axial loads on the testing machine.

7. A device for rapidly converting wheel fatigue equivalent damage, characterized in that, include: The real vehicle road spectrum acquisition unit includes a six-component force sensor and a data acquisition instrument installed on the test vehicle, which are used to collect the wheel six-component force data during the actual vehicle driving process and extract the radial load and axial load; The storage unit is used to store the pre-built wheel finite element simulation model, unit load stress response matrix, fatigue damage model, SN curve of wheel material, and loading parameters of fatigue testing machine; The data processing unit is connected to the actual vehicle road spectrum acquisition unit and the storage unit, and is used to execute the module function of the system as described in claim 1 or 2 or the method as described in any one of claims 3 to 6, to complete load screening, damage calculation, equivalent conversion and load spectrum synthesis. The loading control unit, connected to the data processing unit and the fatigue testing machine, is used to output the synthesized target test load spectrum to the testing machine and control the testing machine to load according to the target load spectrum.

8. The apparatus according to claim 7, characterized in that, The sampling frequency of the actual vehicle road spectrum acquisition unit is no less than 500Hz in order to fully acquire the peak data of instantaneous high load.

9. A computer-readable storage medium, characterized in that, The storage medium stores multiple instructions; the multiple instructions are used by a processor to load and execute the method as described in any one of claims 3 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 3 to 6.

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