Method and system for calculating service life of drive axle of engineering vehicle

Abstract

The invention provides a method and a system for calculating the service life of a drive axle of an engineering vehicle. The method comprises the following steps: establishing a three-dimensional model of the drive axle to obtain stress information of each part of the drive axle; obtaining a finite element model of the drive axle, and generating a stress nephogram and a deformation nephogram according to the finite element model to obtain dangerous parts of the drive axle and key stress of the dangerous parts; generating a load loading sequence of each part of the drive axle according to the stress information and the finite element model, and generating a damage evolution graph of each part of the drive axle based on the load loading sequence; and calculating the fatigue life of the drive axle based on the load spectrum, the damage evolution graph and the S-N curve of the material of each component of the drive axle in combination with a fatigue damage accumulation rule. According to the method, the position of each part with the lowest service life of the drive axle can be obtained, the accurate service life of the drive axle can be accurately calculated, and the service life condition of each part of the drive axle can be quickly predicted.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and in particular to a method and system for calculating the life of a drive axle of an engineering vehicle. Background Art

[0002] Construction vehicles are the backbone of a construction project. Their appearance has doubled the progress of construction projects and greatly reduced manpower. The drive axle is a mechanism located at the end of the transmission system that can change the speed and torque from the transmission and transmit them to the drive wheels. The drive axle is generally composed of a main reducer, a differential, a wheel transmission device and a drive axle housing, and the steering drive axle also has a constant velocity universal joint. In addition, the drive axle must also withstand the vertical force, longitudinal force and lateral force acting between the road surface and the frame or body, as well as the braking torque and reaction force.

[0003] As an important load-bearing component of the vehicle and an important component of the power transmission system, the drive axle needs to withstand complex working loads. At the same time, due to long-term load and wear of the drive axle housing, many failure forms will occur. Therefore, the drive axle needs to meet certain stiffness, strength and fatigue performance requirements.

[0004] In the prior art, when the gears of the drive axle transmit power, they are subjected to long-term loads, which will cause wear, corrosion and fatigue damage to the gears of the differential and reducer. When predicting the life of the drive axle, the experimental cycle is long, and the gap between the life of the drive axle predicted by the theoretical estimation algorithm and the actual service life is large, and it is impossible to accurately and quickly predict the exact service life of the drive axle and its components. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a method and system for calculating the life of a drive axle of an engineering vehicle to solve the deficiencies in the above-mentioned prior art.

[0006] In a first aspect, the present invention provides a method for calculating the life of a drive axle of an engineering vehicle, the method comprising: Establishing a three-dimensional model of the drive axle, and performing force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; Performing finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generating a stress cloud map and a deformation cloud map according to the finite element model, and obtaining a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; Obtaining the working stress of the material of each component of the drive axle, and obtaining the load spectrum of each component of the drive axle according to the force information, and processing the load spectrum to obtain a processed load spectrum; generating a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generating a damage evolution map of each component of the drive axle based on the load loading sequence; The fatigue life of the drive axle is calculated based on the load spectrum, the damage evolution spectrum, and the SN curve of the material of each component of the drive axle in combination with the fatigue damage accumulation law.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: the stress cloud map and the deformation cloud map generated by the finite element model can obtain the dangerous parts in the drive axle and the key stresses of the dangerous parts, so as to obtain the component positions with the lowest service life of each component of the drive axle, and the load spectrum obtained by the working stress of the material of each component and the force information, and the accurate service life of the drive axle can be accurately calculated according to the load spectrum, the damage evolution map and the SN curve, and the service life of each component of the drive axle can be quickly predicted.

[0008] Furthermore, the step of establishing a three-dimensional model of the drive axle and performing force analysis on the drive axle according to the three-dimensional model to obtain force information of each component of the drive axle includes: Using CATIA to establish a three-dimensional model of the drive axle, the three-dimensional model includes a three-dimensional model of the axle housing of the drive axle, a reducer and differential assembly model of the drive axle, and a suspension assembly model of the drive axle; A force analysis is performed on the three-dimensional model of the axle housing, the speed reducer and differential assembly model, and the suspension assembly model to obtain force information of each component of the drive axle.

[0009] Furthermore, the step of performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model includes: Performing static analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under the maximum impact load condition; Performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model under the maximum driving force condition of the vehicle; Performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model under the maximum braking force condition of the vehicle; Under the condition of maximum lateral force of the vehicle, a stress analysis is performed on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model.

[0010] Furthermore, the step of generating a stress cloud map and a deformation cloud map according to the finite element model, and obtaining the dangerous parts of the drive axle and the key stress of the dangerous parts according to the stress cloud map and the deformation cloud map includes: Adding corresponding constraints and corresponding loads to the finite element models of the various components of the drive axle to generate stress cloud maps and deformation cloud maps of the various components of the drive axle; Analyzing the stress cloud map and the deformation cloud map to obtain the node displacement and node force of each component of the drive axle, and obtaining the structural stress of each component of the drive axle based on the node displacement and the node force; The structural stress is analyzed, and the SN curves of the materials of the components of the drive axle are combined to obtain the dangerous parts of the drive axle and the key stresses of the dangerous parts.

[0011] Furthermore, the expression for obtaining the structural stress of each component of the drive axle based on the node displacement and the node force is: ; ; ; In the formula, represents the structural stress, represents the membrane stress, represents the bending stress, represents the nodal force, represents the thickness parameter, represents the cross-section thickness, represents the node displacement, Represents shear stress.

[0012] Furthermore, the step of processing the load spectrum includes: De-noising the load spectrum using a standard deviation method to delete false readings in the load spectrum; Performing peak-valley value detection on the denoised load spectrum to detect peak values ​​and valley values; The peak values ​​and the valley values ​​are arranged in order to form a new digital sequence, so as to remove obsolete values.

[0013] Furthermore, the step of generating a load loading sequence of each component of the drive axle according to the force information and the finite element model includes: Acquire the strain response of the local stress of each component of the drive axle based on the force information and the finite element model, and acquire the generation time of the strain response; A load loading sequence is generated according to the generation time and the local stress.

[0014] In a second aspect, the present invention further provides a system for calculating the life of a drive axle of an engineering vehicle, the system comprising: Establishing an analysis module, which is used to establish a three-dimensional model of the drive axle, and perform force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; an analysis and generation module, configured to perform finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generate a stress cloud map and a deformation cloud map according to the finite element model, and obtain a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; an acquisition processing module, used for acquiring the working stress of the material of each component of the drive axle, acquiring the load spectrum of each component of the drive axle according to the force information, and processing the load spectrum to obtain a processed load spectrum; A generating module, configured to generate a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generate a damage evolution map of each component of the drive axle based on the load loading sequence; A calculation module is used to calculate the fatigue life of the drive axle based on the load spectrum, the damage evolution spectrum and the SN curve of the material of each component of the drive axle in combination with the fatigue damage accumulation law.

[0015] In a third aspect, the present invention further provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for calculating the life of a drive axle of an engineering vehicle.

[0016] In a fourth aspect, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for calculating the life of an engineering vehicle drive axle when executing the computer program. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the method for calculating the life of the engineering vehicle drive axle in the first embodiment of the present invention; Figure 2 is a structural block diagram of a system for calculating the life of an engineering vehicle drive axle in a second embodiment of the present invention; Figure 3 It is a structural block diagram of a computer device in the third embodiment of the present invention.

[0018] Description of main component symbols: 11. Establishing analysis module; 12. Analyzing and generating module; 13. Obtaining and processing module; 14. Generating module; 15. Calculating module; 10. Memory; 20. Processor; 30. Computer program.

[0019] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] Embodiment 1 See also Figure 1 , which is a method for calculating the life of a driving axle of an engineering vehicle in a first embodiment of the present invention, and the method comprises steps S1 to S5: S1, establishing a three-dimensional model of the drive axle, and performing a force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; Specifically, the step S1 includes steps S11 to S12: S11, using CATIA to establish a three-dimensional model of the drive axle, wherein the three-dimensional model includes a three-dimensional model of an axle housing of the drive axle, a speed reducer and differential assembly model of the drive axle, and a suspension assembly model of the drive axle; It is understandable that the drive axle can be modeled using CATIA software. In specific implementation, the bridge housing of the drive axle is first three-dimensionally modeled to obtain a three-dimensional model of the bridge housing. It is worth noting that the three-dimensional model of the bridge housing also includes other accessory models, such as spring seats, shock absorber mounting brackets, rear longitudinal arm mounting brackets, and lateral thrust rod mounting brackets. The bridge housing of the drive axle is first three-dimensionally modeled, and then the others are modeled to obtain a complete three-dimensional model of the bridge housing.

[0024] S12, performing force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model to obtain force information of various components of the drive axle; Specifically, the step S12 includes steps S121 to S124: S121, performing static analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under a maximum impact load condition; It is understandable that when a vehicle is fully loaded and driving on an uneven road, the bridge housing needs to bear the impact load from the uneven road. The load is transmitted to the bridge housing through the wheel, half shaft, support bearing, and bridge housing in sequence. The vertical force on one side of the bridge housing is expressed as: ; In the formula, It represents the vertical force on one side of the bridge housing under the maximum impact load condition. Indicates the rear axle load when the vehicle is fully loaded. represents the dynamic load factor, Represents the acceleration due to gravity.

[0025] S122, performing force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under a maximum driving force condition of the vehicle; It is understandable that when the vehicle is running at the maximum driving force, the axle housing of the drive axle needs to bear the full load gravity of the drive axle and the maximum driving force. At this time, the lateral force can be ignored. The expression of the vertical force on one side of the axle housing is: ; In the formula, It indicates the vertical force on one side of the bridge housing under the condition of maximum driving force of the vehicle. Indicates the rear axle load when the vehicle is fully loaded. Indicates the load transfer coefficient of the drive axle under the maximum driving force condition, In this embodiment, the load transfer coefficient of the drive axle under the maximum driving force condition is The calculation expression is: ; In the formula, Indicates the maximum torque of the engine, Indicates the gear ratio of the reducer. represents the overall transfer efficiency, It represents the height of the center of mass when the vehicle is fully loaded. represents the wheel rolling radius, Indicates the vehicle's wheelbase.

[0026] S123, performing force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under a maximum braking force condition of the vehicle; It is understandable that when the vehicle is in emergency braking, the lateral force is not considered. At this time, the axle housing of the drive axle needs to bear the full-load gravity and braking force of the drive axle. The vertical force on one side of the axle housing is expressed as: ; In the formula, It indicates the vertical force on one side of the bridge housing under the condition of maximum braking force of the vehicle. Indicates the load transfer coefficient of the drive axle under the maximum braking force condition. The calculation expression is: ; In the formula, It represents the distance from the center of mass of the vehicle to the front axle when fully loaded. Represents the ground adhesion coefficient.

[0027] S124, performing force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under a maximum lateral force condition of the vehicle; It is understandable that when the vehicle is turning at the limit, without considering the longitudinal force, when the adhesion force from the ground on the wheel is less than the lateral force on the vehicle, the vehicle will skid. At this time, the expression of the vertical force on one side of the bridge housing is: .

[0028] It is worth mentioning that by modeling and analyzing the forces of various components of the drive axle, and performing force analysis on various components of the drive axle under different working conditions, the force conditions of various components of the drive axle under different working conditions can be obtained, so that the subsequent life calculation can be more accurate.

[0029] S2, performing finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generating a stress cloud map and a deformation cloud map according to the finite element model, and obtaining a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; It should be explained that, in the present embodiment, the finite element analysis of the drive axle is performed by using ANSYS Workbench software in combination with the three-dimensional model and force information, so that the finite element model of each component of the drive axle can be obtained.

[0030] Specifically, the step S2 includes steps S21 to S23: S21, adding corresponding constraints and corresponding loads to the finite element models of the various components of the drive axle to generate stress cloud maps and deformation cloud maps of the various components of the drive axle; It can be understood that in this embodiment, when performing the force analysis, the force conditions of various components of the drive axle under four working conditions are analyzed, and corresponding constraints and loads are added to the drive axle under the four working conditions, so as to obtain the stress and deformation cloud maps of various components of the drive axle under each working condition, and generate stress cloud maps based on the stress of various components of the drive axle under each working condition.

[0031] S22, analyzing the stress cloud map and the deformation cloud map to obtain the node displacement and node force of each component of the drive axle, and obtaining the structural stress of each component of the drive axle based on the node displacement and the node force; It can be understood that by analyzing the stress cloud map and the deformation cloud map, the corresponding data of each component in the stress cloud map and the deformation cloud map are linked, and the node displacement of each component and the force exerted on the node, that is, the node force, can be obtained according to the linked stress cloud map and the deformation cloud map, and the structural stress of each component of the drive axle is obtained through the node displacement and the node force. In this embodiment, the expression for obtaining the structural stress of each component of the drive axle based on the node displacement and the node force is: ; ; ; In the formula, represents the structural stress, represents the membrane stress, represents the bending stress, represents the nodal force, represents the thickness parameter, represents the cross-section thickness, represents the node displacement, Represents shear stress.

[0032] S23, analyzing the structural stress, and combining the SN curves of the materials of the components of the drive axle to obtain the dangerous parts of the drive axle and the key stresses of the dangerous parts; It can be understood that the SN curve represents the material stress-life curve of each component of the drive axle. By combining the SN curve with the structural stress, the dangerous components of the drive axle can be obtained, and the dangerous parts of each component can also be obtained. Combining the SN curve can further obtain the key stress of the dangerous parts, that is, the critical force of each component of the drive axle.

[0033] S3, obtaining the working stress of the material of each component of the drive axle, and obtaining the load spectrum of each component of the drive axle according to the force information, and processing the load spectrum to obtain a processed load spectrum; It can be understood that the load spectrum of each component of the drive axle is generated by combining the working stress of the material of each component of the drive axle, that is, the stress condition to which the drive axle is subjected under various working conditions, with the force information and the stress condition.

[0034] Specifically, the step S3 includes steps S31 to S33: S31, denoising the load spectrum using a standard variance method to delete false readings in the load spectrum; It is understandable that there will be different types of noise in the original load spectrum, so that the original load spectrum cannot truly reflect the amplitude of each component when it is subjected to stress. These readings are called pseudo readings. By adopting the standard variance method, the pseudo readings in the load spectrum can be eliminated, so that the load spectrum can truly reflect the amplitude of each component of the drive axle when it is subjected to stress.

[0035] S32, performing peak-valley detection on the denoised load spectrum to detect peak values ​​and valley values; S33, arranging the peak values ​​and the valley values ​​in order to form a new digital sequence, so as to remove discarded values; It is understandable that all peaks and valleys in the discrete digital sequence need to be detected and formed into a new digital series in order, so that all discarded values ​​can be removed.

[0036] S4, generating a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generating a damage evolution map of each component of the drive axle based on the load loading sequence; Specifically, the step S4 includes step S41 to step S42: S41, obtaining a strain response of a local stress of each component of the drive axle based on the force information and the finite element model, and obtaining a generation time of the strain response; S42, generating a load loading sequence according to the generation time and the local stress; It is understandable that the order of loading the loads will have a certain degree of influence on the fatigue life of each component of the drive axle. The stress order of each component of the drive axle is different under different working conditions of the vehicle. Therefore, the strain response of the local stress of each component of the drive axle under different working conditions is obtained through the finite element model, and then the load loading order of each component of the drive axle is generated according to the generation time of the strain response. Therefore, when calculating the life of the drive axle, the life of the drive axle can be predicted according to the load loading order. The load loading order of each component of the drive axle is different under different working conditions, which will have a certain degree of influence on the life of each component. According to different load loading orders, the life of each component of the drive axle can be predicted more accurately.

[0037] It is worth mentioning that the damage evolution map of each component of the drive axle can be evolved through the load loading sequence, that is, the map of the force sequence and force time of each component of the drive axle under different working conditions, so that the force damage of the drive axle can be understood more clearly, and the life of the drive axle can be predicted more accurately.

[0038] S5, calculating the fatigue life of the drive axle based on the load spectrum, the damage evolution spectrum, and the SN curves of the materials of the components of the drive axle in combination with the fatigue damage accumulation law; It can be understood that the fatigue failure of the drive axle has low stress, sensitivity, suddenness, complex and changeable fatigue fracture and time. In this embodiment, the expression of the SN curve of the material is: ; In the formula, represents the material stress, Indicates life span, represents the thickness parameter, represents the material constant; It should be explained that the damage evolution map can correct the SN curve of the material of each component of the drive axle, and the fatigue life of the drive axle can be calculated by the load spectrum of each component of the drive axle and combined with the fatigue damage accumulation law. In this embodiment, the fatigue life calculation expression of the axle housing of the drive axle is: ; In the formula, Indicates the stress on the axle housing of the drive axle. represents the material stress, Indicates the fatigue life of the axle housing of the drive axle, Indicates the maximum membrane stress of the axle housing of the drive axle, Indicates the maximum bending stress of the axle housing of the drive axle; it is worth noting that the suspension assembly model of the drive axle is calculated together with the fatigue life of the axle housing of the drive axle; In this embodiment, the fatigue life of the reducer and differential assembly is based on the fatigue damage accumulation law. The equivalent stress of each stress level will cause certain damage to the reducer and differential assembly. The damage caused to the primary reduction driving gear and the secondary reduction driving gear in the reducer and differential assembly by the fatigue damage accumulation law is obtained, and the total damage of the primary reduction driving gear and the secondary reduction driving gear in the reducer and differential assembly is obtained. Then, the critical value of the damage of the primary reduction driving gear and the secondary reduction driving gear is obtained through the force sequence and force time spectrum of the primary reduction driving gear and the secondary reduction driving gear in the reducer and differential assembly under different working conditions. In this embodiment, the critical value is 1, and the calculation expression of the fatigue life of the reducer and differential assembly is: ; In the formula, Indicates the fatigue life of the reducer and differential assembly. It indicates the total damage of the primary reduction driving gear and the secondary reduction driving gear in the reducer and differential assembly. Therefore, the fatigue life of each component of the drive axle can be calculated from the damage evolution map, and the fatigue life of each component of the drive axle can be calculated more accurately.

[0039] In summary, the method for calculating the life of an engineering vehicle drive axle in the above-mentioned embodiment of the present invention can obtain the dangerous parts and the key stresses of the dangerous parts in the drive axle through the stress cloud map and the deformation cloud map generated by the finite element model, so as to obtain the position of the component with the lowest life of each component of the drive axle, and the load spectrum obtained by the working stress of the material of each component and the force information, and according to the load spectrum, the damage evolution map and the SN curve, the accurate service life of the drive axle can be accurately calculated, and the life of each component of the drive axle can be quickly predicted.

[0040] Embodiment 2 The second embodiment of the present invention also provides a system for calculating the life of a drive axle of an engineering vehicle, see Figure 2 , which is a system for calculating the life of a drive axle of an engineering vehicle in a second embodiment of the present invention, and the system comprises: Establishing an analysis module 11, for establishing a three-dimensional model of the drive axle, and performing a force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; An analysis and generation module 12 is used to perform finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generate a stress cloud map and a deformation cloud map according to the finite element model, and obtain a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; An acquisition processing module 13 is used to acquire the working stress of the material of each component of the drive axle, and acquire the load spectrum of each component of the drive axle according to the force information, and process the load spectrum to obtain a processed load spectrum; A generating module 14, configured to generate a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generate a damage evolution map of each component of the drive axle based on the load loading sequence; The calculation module 15 is used to calculate the fatigue life of the drive axle based on the load spectrum, the damage evolution spectrum and the SN curve of the material of each component of the drive axle in combination with the fatigue damage accumulation law.

[0041] In some optional embodiments, the establishing analysis module 11 includes: A building unit, used for building a three-dimensional model of the drive axle by using CATIA, wherein the three-dimensional model includes a three-dimensional model of an axle housing of the drive axle, a speed reducer and differential assembly model of the drive axle, and a suspension assembly model of the drive axle; The first analysis unit is used to perform force analysis on the three-dimensional model of the axle housing, the speed reducer and differential assembly model, and the suspension assembly model to obtain force information of various components of the drive axle.

[0042] In some optional embodiments, the first analysis unit includes: A first analysis subunit is used to perform static analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under a maximum impact load condition; A second analysis subunit is used to perform force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under the vehicle maximum driving force condition; A third analysis subunit is used to perform force analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under the maximum braking force condition of the vehicle; The fourth analysis subunit is used to perform force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model under the maximum lateral force condition of the vehicle.

[0043] In some optional embodiments, the analysis generation module 12 includes: A first generating unit, used for adding corresponding constraints and corresponding loads to the finite element models of the various components of the drive axle, so as to generate stress cloud maps and deformation cloud maps of the various components of the drive axle; A second analysis unit is used to analyze the stress cloud map and the deformation cloud map to obtain the node displacement and node force of each component of the drive axle, and obtain the structural stress of each component of the drive axle based on the node displacement and the node force; The expression for obtaining the structural stress of each component of the drive axle based on the node displacement and the node force is: ; ; ; In the formula, represents the structural stress, represents the membrane stress, represents the bending stress, represents the nodal force, represents the thickness parameter, represents the cross-section thickness, represents the node displacement, represents shear stress; The third analysis unit is used to analyze the structural stress and obtain the dangerous parts of the drive axle and the key stress of the dangerous parts in combination with the SN curves of the materials of the components of the drive axle.

[0044] In some optional embodiments, the acquisition processing module 13 includes: A denoising unit, used for denoising the load spectrum by using a standard variance method to delete false readings in the load spectrum; A detection unit, used for performing peak-valley detection on the load spectrum after denoising to detect peak values ​​and valley values; The removing unit is used to arrange the peak values ​​and the valley values ​​in order to form a new digital sequence, so as to remove the discarded values.

[0045] In some optional embodiments, the generating module 14 includes: an acquisition unit, configured to acquire a strain response of a local stress of each component of the drive axle based on the force information and the finite element model, and acquire a generation time of the strain response; The second generating unit is used to generate a load loading sequence according to the generating time and the local stress.

[0046] The functions or operation steps implemented when the above modules and units are executed are generally the same as those in the above method embodiments, and will not be repeated here.

[0047] The system for calculating the life of an engineering vehicle drive axle provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the system embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0048] Embodiment 3 The present invention also provides a computer device, see Figure 3 , shown is a computer device in the third embodiment of the present invention, including a memory 10, a processor 20, and a computer program 30 stored in the memory 10 and executable on the processor 20. When the processor 20 executes the computer program 30, the above-mentioned method for calculating the life of the engineering vehicle drive axle is implemented.

[0049] The memory 10 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the memory 10 may be an internal storage unit of a computer device, such as a hard disk of the computer device. In other embodiments, the memory 10 may also be an external storage device, such as a plug-in hard disk, a smart memory card (Smart MediaCard, SMC), a secure digital (Secure Digital, SD) card, a flash card, etc. Further, the memory 10 may also include both an internal storage unit of a computer device and an external storage device. The memory 10 may be used not only to store application software and various types of data installed in the computer device, but also to temporarily store data that has been output or is to be output.

[0050] Among them, in some embodiments, the processor 20 can be an electronic control unit (Electronic Control Unit, abbreviated as ECU, also known as a vehicle computer), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor or other data processing chip, used to run the program code stored in the memory 10 or process data, such as executing access restriction programs, etc.

[0051] It should be pointed out that Figure 3 The structure shown does not constitute a limitation on the computer device. In other embodiments, the computer device may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0052] The embodiment of the present invention further provides a readable storage medium on which a computer program is stored. When the program is executed by a processor, the method for calculating the life of a drive axle of an engineering vehicle as described above is implemented.

[0053] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0054] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0055] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for calculating the life of a drive axle of an engineering vehicle, characterized in that: The method comprises: Establishing a three-dimensional model of the drive axle, and performing force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; Performing finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generating a stress cloud map and a deformation cloud map according to the finite element model, and obtaining a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; Obtaining the working stress of the material of each component of the drive axle, and obtaining the load spectrum of each component of the drive axle according to the force information, and processing the load spectrum to obtain a processed load spectrum; generating a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generating a damage evolution map of each component of the drive axle based on the load loading sequence; The fatigue life of the drive axle is calculated based on the load spectrum, the damage evolution spectrum, and the SN curve of the material of each component of the drive axle in combination with the fatigue damage accumulation law.

2. The method for calculating the life of a construction vehicle drive axle according to claim 1, characterized in that: The step of establishing a three-dimensional model of the drive axle and performing force analysis on the drive axle according to the three-dimensional model to obtain force information of each component of the drive axle includes: Using CATIA to establish a three-dimensional model of the drive axle, the three-dimensional model includes a three-dimensional model of the axle housing of the drive axle, a reducer and differential assembly model of the drive axle, and a suspension assembly model of the drive axle; A force analysis is performed on the three-dimensional model of the axle housing, the speed reducer and differential assembly model, and the suspension assembly model to obtain force information of each component of the drive axle.

3. The method for calculating the life of a construction vehicle drive axle according to claim 2, characterized in that: The step of performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model comprises: Performing static analysis on the axle housing three-dimensional model, the speed reducer and differential assembly model, and the suspension assembly model under the maximum impact load condition; Performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model under the maximum driving force condition of the vehicle; Performing force analysis on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model under the maximum braking force condition of the vehicle; Under the condition of maximum lateral force of the vehicle, a stress analysis is performed on the three-dimensional model of the bridge housing, the speed reducer and differential assembly model, and the suspension assembly model.

4. The method for calculating the life of an engineering vehicle drive axle according to claim 1, characterized in that: The step of generating a stress cloud map and a deformation cloud map according to the finite element model, and obtaining the dangerous parts of the drive axle and the key stress of the dangerous parts according to the stress cloud map and the deformation cloud map comprises: Adding corresponding constraints and corresponding loads to the finite element models of the various components of the drive axle to generate stress cloud maps and deformation cloud maps of the various components of the drive axle; Analyzing the stress cloud map and the deformation cloud map to obtain the node displacement and node force of each component of the drive axle, and obtaining the structural stress of each component of the drive axle based on the node displacement and the node force; The structural stress is analyzed, and the SN curves of the materials of the components of the drive axle are combined to obtain the dangerous parts of the drive axle and the key stresses of the dangerous parts.

5. The method for calculating the life of a construction vehicle drive axle according to claim 4, characterized in that: The expression for obtaining the structural stress of each component of the drive axle based on the node displacement and the node force is: ； ； ； In the formula, represents the structural stress, represents the membrane stress, represents the bending stress, represents the nodal force, represents the thickness parameter, represents the cross-section thickness, represents the node displacement, Represents shear stress.

6. The method for calculating the life of a construction vehicle drive axle according to claim 1, characterized in that: The step of processing the load spectrum comprises: De-noising the load spectrum using a standard deviation method to delete false readings in the load spectrum; Performing peak-valley value detection on the denoised load spectrum to detect peak values ​​and valley values; The peak values ​​and the valley values ​​are arranged in order to form a new digital sequence, so as to remove obsolete values.

7. The method for calculating the life of a construction vehicle drive axle according to claim 1, characterized in that: The step of generating a load loading sequence of each component of the drive axle according to the force information and the finite element model comprises: Acquire the strain response of the local stress of each component of the drive axle based on the force information and the finite element model, and acquire the generation time of the strain response; A load loading sequence is generated according to the generation time and the local stress.

8. A system for calculating the life of a drive axle of an engineering vehicle, characterized in that: The system comprises: Establishing an analysis module, which is used to establish a three-dimensional model of the drive axle, and perform force analysis on the drive axle according to the three-dimensional model to obtain force information of various components of the drive axle; an analysis and generation module, configured to perform finite element analysis on the drive axle based on the three-dimensional model and the force information to obtain a finite element model of the drive axle, generate a stress cloud map and a deformation cloud map according to the finite element model, and obtain a dangerous part of the drive axle and a key stress of the dangerous part according to the stress cloud map and the deformation cloud map; an acquisition processing module, used for acquiring the working stress of the material of each component of the drive axle, acquiring the load spectrum of each component of the drive axle according to the force information, and processing the load spectrum to obtain a processed load spectrum; A generating module, configured to generate a load loading sequence of each component of the drive axle according to the force information and the finite element model, and generate a damage evolution map of each component of the drive axle based on the load loading sequence; A calculation module is used to calculate the fatigue life of the drive axle based on the load spectrum, the damage evolution spectrum and the SN curve of the material of each component of the drive axle in combination with the fatigue damage accumulation law.

9. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for calculating the life of an engineering vehicle drive axle as described in any one of claims 1 to 7 is implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for calculating the life of an engineering vehicle drive axle as described in any one of claims 1 to 7 is implemented.

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