A method and device for analyzing the friction behavior of a vehicle tread brake

Abstract

The embodiment of the application provides a vehicle tread braking friction behavior analysis method and device, solves the problem that the interference of wheel-rail excitation received by a train in an actual running process is not considered at present, and makes the analysis of tread braking friction behavior insufficient. The vehicle tread braking friction behavior analysis method comprises the following steps: constructing a vehicle dynamics model considering tread braking; constructing a tread braking refined dynamics model based on the vehicle dynamics model considering tread braking; and analyzing tread friction behavior according to the tread braking refined dynamics model.

Description

Technical Field

[0001] This invention relates to the field of tread braking analysis technology, specifically to a method and apparatus for analyzing vehicle tread braking friction behavior. Background Technology

[0002] As a vital national infrastructure, the main artery of the national economy, and a primary mode of transportation for the people, the importance of the braking system in railways is self-evident. Tread brakes, due to their simple structure, low cost, and function of cleaning the wheel treads during braking, are commonly used in railway freight cars and subway vehicles. When a train executes a tread brake command, the brake shoes are acted upon by the brake lever, thus contacting the wheel treads and generating friction to decelerate or maintain a constant speed.

[0003] When a train applies tread braking, its enormous kinetic energy is converted into heat energy through friction between the brake shoes and wheels. This process is accompanied by a series of highly complex tribological behaviors, such as frictional heat generation, frictional wear, contact state evolution, and interface damage. These behaviors all affect the stability and reliability of the tread braking system. Accurate analysis of these frictional behaviors can effectively prevent abnormal failures of brake shoes and wheel treads, extend their service life, and reduce maintenance costs. It also provides a theoretical basis for brake shoe and tread design and braking reliability analysis.

[0004] However, studies on vehicle tread braking friction behavior typically assume an ideal braking environment and fail to consider the interference of wheel-rail excitation experienced by the train during actual operation, resulting in insufficient analysis of tread braking friction behavior. Therefore, it is necessary to establish a method for analyzing vehicle tread braking friction behavior that considers wheel-rail excitation, enabling a more accurate analysis of the friction behavior of the tread braking system during train braking. Summary of the Invention

[0005] In view of this, the present invention provides a method and apparatus for analyzing vehicle tread braking friction behavior, which solves the problem that the traditional tread braking friction behavior analysis only considers the ideal case of pure wheel rotation, making the tread braking friction behavior analysis results relatively simple and the calculation results differ greatly from the actual situation.

[0006] In a first aspect, an embodiment of the present invention provides a method for analyzing the braking friction behavior of a vehicle tread, comprising: constructing a vehicle dynamics model considering tread braking; constructing a refined dynamics model of tread braking based on the vehicle dynamics model considering tread braking; and analyzing the tread friction behavior according to the constructed refined dynamics model of tread braking.

[0007] In one embodiment, the construction of a vehicle dynamics model considering tread braking includes: simulating the brake shoe-wheel normal contact mode using a nonlinear spring to establish a brake shoe-wheel normal contact model; performing an equivalent simulation using the Stribeck model to establish a brake shoe-wheel tread friction model; and establishing a vehicle system dynamics model considering brake shoes based on vehicle system dynamics and wheel-rail relationship theory, combined with the brake shoe dynamics model.

[0008] In one embodiment, the construction of a refined dynamic model for tread braking based on the vehicle dynamics model considering tread braking includes: establishing a brake shoe-wheel finite element model using the finite element method; and, based on the vehicle dynamics model considering tread braking, introducing the temperature fields of the brake shoe and wheel and establishing a boundary model of brake shoe thrust and wheel displacement using displacement and force amplitude functions.

[0009] In one embodiment, the step of establishing a brake shoe-wheel finite element model using the finite element method includes: establishing a solid model in 3D modeling software based on the actual dimensions of the brake shoe and wheel; meshing the brake shoe and wheel and establishing a brake shoe-wheel finite element model; assigning material properties to the brake shoe and wheel; coupling the back of the brake shoe to a reference point above the brake shoe via dynamic coupling; and coupling the inner surface of the wheel to a reference point on the wheel axis, so as to apply load and displacement boundary conditions to the brake shoe and wheel.

[0010] In one embodiment, the step of introducing the brake shoe and wheel temperature fields and establishing the brake shoe thrust and wheel displacement boundary models based on the vehicle dynamics model considering tread braking includes: obtaining the real-time brake shoe thrust, friction coefficient, and relative displacement between the brake shoe and wheel during tread braking under wheel-rail excitation based on the vehicle dynamics model considering tread braking; obtaining the heat flux density of the brake shoe friction surface and wheel tread at different axial positions over time according to the friction power method, and obtaining the temperature distribution of the brake shoe and wheel by establishing a heat conduction analysis step; creating a predefined temperature field to introduce the temperature distribution of the brake shoe and wheel, and creating a table of displacement and force amplitude functions to set the brake shoe thrust and wheel displacement boundaries.

[0011] In one embodiment, the step of analyzing the tread friction behavior based on the refined dynamic model of tread braking includes: introducing the temperature distribution of the brake shoe and wheel through a sequential coupling simulation method, and creating a dynamic explicit analysis step to simulate the vehicle tread braking friction behavior to obtain tribological indices that consider wheel-rail excitation and temperature effects; and obtaining evaluation indicators of the tribological indices to analyze the stability, reliability and influencing factors of the tread braking friction behavior.

[0012] Secondly, an embodiment of the present invention provides a vehicle tread braking friction behavior analysis device, comprising: a model building module for building a vehicle dynamics model considering tread braking; building a refined dynamics model of tread braking based on the vehicle dynamics model considering tread braking; and an analysis module for analyzing tread friction behavior according to the refined dynamics model of tread braking.

[0013] Thirdly, an embodiment of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described above.

[0014] Fourthly, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0015] Fifthly, an embodiment of the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the method described above.

[0016] This invention provides a method and apparatus for analyzing vehicle tread braking friction behavior. It constructs a vehicle dynamics model considering tread braking; builds a refined dynamics model of tread braking based on the vehicle dynamics model considering tread braking; analyzes tread friction behavior according to the refined dynamics model of tread braking; considers the frictional contact relationship between the brake shoe and the wheel tread, models the brake shoe-wheel normal contact using a normal nonlinear spring, and models the brake shoe-wheel friction using the Stribeck model. This makes the friction behavior of tread braking closer to reality, with advantages such as more comprehensive consideration of factors, more realistic and reliable calculation results. It overcomes the ideal assumption of only considering pure wheel rotation in traditional tread braking friction behavior analysis, making the analysis of tread braking friction behavior more accurate and avoiding the shortcomings of overly simplistic traditional analysis. Attached Figure Description

[0017] Figure 1 The diagram shows a flowchart of a vehicle tread braking friction behavior analysis method provided in an embodiment of the present invention.

[0018] Figure 2 The diagram shows a flowchart of a vehicle dynamics model that considers tread braking, according to an embodiment of the present invention.

[0019] Figure 3 The diagram shows a flowchart of a method for constructing a refined dynamic model of tread braking according to an embodiment of the present invention.

[0020] Figure 4The diagram shows a flowchart of an embodiment of the present invention for analyzing the friction behavior of a tread surface.

[0021] Figure 5 The diagram shown is a structural diagram of a vehicle tread braking friction behavior analysis device provided in an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this disclosure, and to fully understand and implement the process of how this disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. The embodiments of this disclosure and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort should fall within the protection scope of this disclosure.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0025] In one embodiment of the present invention, a method for analyzing the braking friction behavior of vehicle treads is provided, such as... Figure 1 As shown, the method for analyzing the braking friction behavior of the vehicle tread includes: Step 01: Construct a vehicle dynamics model that considers tread braking.

[0026] Step 02: Construct a refined dynamic model of tread braking based on the vehicle dynamics model that considers tread braking.

[0027] Step 03: Analyze the tread friction behavior based on the refined dynamic model of tread braking.

[0028] The method provided in this embodiment models a vehicle dynamics model that considers tread braking. The model takes into account the frictional contact relationship between the brake shoe and the wheel tread in detail. It overcomes the ideal assumption that only the pure rotation of the wheel is considered in the traditional tread braking friction behavior analysis, making the tread braking friction behavior analysis more accurate and avoiding the shortcomings of the traditional analysis being too simplistic. It has the advantages of considering more comprehensive factors and the calculation results being more realistic and reliable.

[0029] In one embodiment of the present invention, the construction of a vehicle dynamics model considering tread braking is as follows: Figure 2 As shown, it includes: Step 011: Simulate the brake shoe-wheel normal contact mode using a nonlinear spring to establish a brake shoe-wheel normal contact model.

[0030] Step 012: Use the Stribeck model to perform an equivalent simulation to establish a friction model for the brake shoe-wheel tread.

[0031] Step 013: Based on the theoretical foundation of vehicle system dynamics and wheel-rail relationship, and combined with the brake shoe dynamics model, establish a vehicle system dynamics model that considers the brake shoe.

[0032] It is understandable that when braking is applied, the brake shoe contacts the wheel tread to generate tangential braking force, thereby generating braking torque to prevent the wheel from rotating.

[0033] In step 011, the brake shoe-wheel normal contact mode is simulated using a nonlinear spring. The expression for the nonlinear spring containing cubic terms is:

[0034] Where F is the generated spring force, E is the spring's potential energy, and a and b are the spring constants. This represents the spring displacement. The normal contact force can be obtained by measuring the normal relative displacement between the brake shoe and the wheel tread.

[0035] For the brake shoe-wheel tread friction model, the Stribeck model is used for equivalent simulation. Its functional expression is:

[0036] in, The coefficient of kinetic friction; The coefficient of static friction; It is an exponential decay factor; This refers to relative velocity.

[0037] Furthermore, in step 012, a vehicle system dynamics model is established using multibody dynamics. Based on the theoretical foundations of vehicle system dynamics and wheel-rail relationships, a vehicle system dynamics model considering brake shoes is established in conjunction with the brake shoe dynamics model. The coupled dynamics model mainly includes the vehicle system and the wheel-rail relationship. The established vehicle dynamics model consists of the car body, bogie frame, axle boxes, brake shoes, and wheelsets, all of which are considered rigid bodies.

[0038] The car body is supported on the bogie frame via a secondary suspension; the bogie is supported on the two wheelsets via a primary suspension. Axle boxes are mounted at the ends of the wheelsets. Brake shoes are connected to the base braking system and to the bogie frame via a spring-damping mechanism.

[0039] The suspension system in the vehicle is equivalent to a spring-damping device, and each rigid body has a maximum of three degrees of freedom, namely vertical, pitch, and longitudinal motion.

[0040] In addition, the dynamic model includes the longitudinal motion of the brake shoes. The dynamic interactions between different components of the vehicle are simulated using spring-damped elements. Furthermore, nonlinear characteristics such as wedge-shaped friction dampers, axle box dry friction, and axle box clearance are considered.

[0041] The most commonly used method for calculating the vertical interaction force between wheel and rail in wheel-rail relationships is Hertz's nonlinear elasticity theory, from which the vertical interaction force between wheel and rail is derived, specifically expressed as:

[0042] in, The wheel-rail contact constant is... Let be the elastic compressive deformation caused by the contact between the wheelset and the rail. The wheel-rail contact deformation at the j-th wheelset is expressed as:

[0043] in, This represents the vertical displacement of the wheel at the point of contact. This represents the vertical displacement of the rail at the point of contact. The geometric irregularities that occur on the surfaces of rails and wheels.

[0044] Furthermore, the longitudinal creep force in the wheel-rail relationship can be expressed as the product of the vertical wheel-rail force and the adhesion coefficient, specifically:

[0045] in, The vertical contact force between the wheel and rail. This is the coefficient of adhesion of the wheel-rail contact surface, which is determined based on factors such as the condition of the rail surface and weather conditions. Specifically, it is expressed as:

[0046] a, b, c, and d need to be selected based on the actual track surface conditions. The difference between the wheel's rotational speed and the vehicle's moving speed is expressed as:

[0047] in, Indicates the speed of wheel rotation. Indicates the nominal rolling radius of the wheel. Indicates the vehicle's speed.

[0048] Furthermore, by substituting the various forces inside the vehicle into the vehicle's equations of motion, the vehicle's equations of motion can be expressed in matrix form as follows:

[0049] in, , , These represent the vehicle's acceleration, velocity, and displacement vectors, respectively. , , These represent the vehicle's mass matrix, damping matrix, and stiffness matrix, respectively. This is the vector of external forces acting on the vehicle, including external forces such as coupler force and wheel-rail excitation.

[0050] Furthermore, by using numerical integration, the vehicle dynamics response under different simulation conditions can be obtained. The integration format is as follows:

[0051] Among them, parameters and To keep the algorithm stable, the initial step is set to 0, and from the second step onwards, it is kept at 0.5. Let n be the step size for numerical integration, and the subscript n indicates the step size in the numerical integration process. Integral over time.

[0052] The method described in this embodiment models the brake shoe-wheel normal contact using a normal nonlinear spring and the brake shoe-wheel friction using the Stribeck model. Furthermore, it considers in detail the nonlinear characteristics of the vehicle system, such as the wedge-shaped friction damper, axle box dry friction, and axle box clearance. By establishing a detailed vehicle system model, this method makes the friction behavior of tread braking more closely resemble reality, offering advantages such as more comprehensive consideration of factors and more realistic and reliable calculation results.

[0053] In one embodiment of the present invention, the construction of a refined dynamic model for tread braking based on the vehicle dynamics model considering tread braking is as follows: Figure 3 As shown, it includes: Step 021: Establish a finite element model of the brake shoe-wheel using the finite element method.

[0054] Step 022: Based on the vehicle dynamics model considering tread braking, introduce the brake shoe and wheel temperature fields and use displacement and force amplitude functions to establish the brake shoe thrust and wheel displacement boundary models.

[0055] This can be understood as follows: In step 021, a solid model is established in 3D modeling software based on the actual dimensions of the brake shoe and wheel. The brake shoe and wheel are then meshed. During meshing, geometric structures such as rounded edges, chamfers, and rounded holes that do not affect the calculation results can be ignored. Furthermore, a brake shoe-wheel finite element model is established in the commercial finite element software ABAQUS. Material properties are assigned to the brake shoe and wheel according to actual conditions, and the back surface of the brake shoe is coupled to a reference point above the brake shoe via dynamic coupling. The inner surface of the wheel is also coupled to a reference point on the wheel axis, thus facilitating the application of loads and displacement boundary conditions to the brake shoe and wheel.

[0056] Furthermore, in step 022, the real-time brake shoe thrust, friction coefficient, and relative displacement between the brake shoe and the wheel during tread braking under wheel-rail excitation are calculated from the vehicle dynamics model established in step 01. The heat flux density of the brake shoe friction surface and the wheel tread at different axial positions over time is calculated using the friction power method subroutine DFLUX. The temperature distribution of the brake shoe and the wheel is pre-calculated by establishing a heat conduction analysis step. In the load application module, the temperature distribution of the brake shoe and the wheel is introduced by creating a predefined temperature field and a table amplitude function of displacement and force is created to set the boundaries of brake shoe thrust and wheel displacement.

[0057] The method provided in this embodiment calculates the heat flux density distribution of the brake shoe friction surface and the wheel tread when the vehicle tread is braked under wheel-rail excitation by writing the subroutine DFLUX, and takes into account the wheel tread radius that varies with axial position, thus overcoming the defect of existing methods that calculate the heat flux density of the brake shoe friction surface and the wheel tread too ideally.

[0058] In one embodiment of the present invention, the tread friction behavior is analyzed based on the refined dynamic model of tread braking, such as... Figure 4 As shown, it includes: Step 031: Introduce the temperature distribution of brake shoes and wheels through sequential coupling simulation method, and create a dynamic explicit analysis step to simulate the braking friction behavior of vehicle tread, so as to obtain tribological indices that take into account wheel-rail excitation and temperature effects.

[0059] Step 032: Obtain tribological evaluation indicators to analyze the stability, reliability and influencing factors of tread braking friction behavior.

[0060] It is understandable that by introducing the temperature distribution of the brake shoe and wheel through sequential coupling simulation, a dynamic explicit analysis step is created to simulate the braking friction behavior of the vehicle tread. This yields tribological indices such as contact stress, friction force, and contact area, taking into account wheel-rail excitation and temperature effects. By calculating the average, maximum, and effective values ​​of these tribological indices, the stability, reliability, and key influencing factors of the tread braking friction behavior are analyzed.

[0061] The method provided in this implementation constructs a refined dynamic model of tread braking that considers wheel-rail excitation and temperature effects. This model can more realistically simulate the friction process between the brake shoe and the wheel, thereby more accurately analyzing the friction behavior of vehicle tread braking. It avoids the shortcomings of traditional analysis methods that are too simplistic, and provides an effective analytical means for the design of tribological behavior and improvement of tribological performance of tread braking systems.

[0062] In one embodiment of the present invention, a vehicle tread braking friction behavior analysis device 100 is provided, such as... Figure 5 As shown, the device includes a model building module 10 and an analysis module 20. The model building module 10 is used to build a vehicle dynamics model considering tread braking; and based on the vehicle dynamics model considering tread braking, to build a refined tread braking dynamics model. The analysis module 20 is used to analyze tread friction behavior based on the refined tread braking dynamics model.

[0063] Furthermore, the model building module 10 is also used to simulate the brake shoe-wheel normal contact mode through nonlinear springs to establish a brake shoe-wheel normal contact model; to perform equivalent simulation using the Stribeck model to establish a brake shoe-wheel tread friction model; and to establish a vehicle system dynamics model considering the brake shoe based on the vehicle system dynamics and wheel-rail relationship theory, combined with the brake shoe dynamics model.

[0064] Furthermore, the model building module 10 is also used to establish a brake shoe-wheel finite element model using the finite element method; based on the vehicle dynamics model considering tread braking, the temperature fields of the brake shoe and wheel are introduced and the amplitude functions of displacement and force are used to establish the boundary models of brake shoe thrust and wheel displacement.

[0065] Furthermore, the model building module 10 is also used to establish solid models in 3D modeling software based on the actual dimensions of the brake shoes and wheels; to mesh the brake shoes and wheels and establish a brake shoe-wheel finite element model; to assign material properties to the brake shoes and wheels, to couple the back of the brake shoes to a reference point above the brake shoes via dynamic coupling, and to couple the inner surface of the wheel to a reference point on the wheel axis, so as to apply load and displacement boundary conditions to the brake shoes and wheels; to obtain the real-time brake shoe thrust, friction coefficient, and relative displacement between the brake shoes and wheels under wheel-rail excitation during tread braking based on the vehicle dynamics model considering tread braking; to obtain the heat flux density of the brake shoe friction surface and the wheel tread at different axial positions over time according to the friction power method, and to obtain the temperature distribution of the brake shoes and wheels by establishing a heat conduction analysis step; to create a predefined temperature field to introduce the temperature distribution of the brake shoes and wheels, and to create a table of displacement and force amplitude functions to set the brake shoe thrust and wheel displacement boundaries.

[0066] Furthermore, the analysis module 20 is also used to introduce the temperature distribution of the brake shoe and wheel through a sequential coupling simulation method, and to create a dynamic explicit analysis step to simulate the braking friction behavior of the vehicle tread, so as to obtain tribological indices that take into account wheel-rail excitation and temperature effects; and to obtain evaluation indices of tribological indices to analyze the stability, reliability and influencing factors of the braking friction behavior of the tread.

[0067] Based on the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0068] In some embodiments of this example, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0069] In some embodiments of this example, a computer program product is provided, including a computer program / instructions, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0070] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for executing the methods described in the above embodiments. Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media can include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, and computer storage media (e.g., hard disks, floppy disks, solid-state drives, removable disks, CDs). ROM, DVD ROM, Blu-ray discs, etc.

[0071] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0072] In addition, the computer device may include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., keyboard, mouse, speakers, etc.).

[0073] The processor can communicate with external devices via the I / O bus through wired or wireless networks.

[0074] In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions are executed by a processor to perform the steps of the various functions and / or methods in the embodiments described herein.

[0075] In the embodiments provided in this disclosure, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0076] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0077] While the embodiments disclosed herein are as described above, the foregoing content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A method for analyzing the braking friction behavior of vehicle treads, characterized in that, include: Construct a vehicle dynamics model that considers tread braking; A refined dynamic model of tread braking is constructed based on the vehicle dynamics model that considers tread braking. The tread friction behavior is analyzed based on the refined dynamic model of tread braking.

2. The method for analyzing vehicle tread braking friction behavior according to claim 1, characterized in that, The construction of the vehicle dynamics model considering tread braking includes: A brake shoe-wheel normal contact model is established by simulating the brake shoe-wheel normal contact mode using a nonlinear spring. The Stribeck model was used for equivalent simulation to establish a friction model of brake shoe-wheel tread. Based on the theoretical foundations of vehicle system dynamics and wheel-rail relationship, a vehicle system dynamics model considering brake shoes is established by combining the brake shoe dynamics model.

3. The method for analyzing vehicle tread braking friction behavior according to claim 1, characterized in that, The construction of a refined dynamic model for tread braking based on the vehicle dynamics model considering tread braking includes: A finite element model of the brake shoe-wheel was established using the finite element method. Based on the vehicle dynamics model that considers tread braking, the temperature fields of brake shoes and wheels are introduced, and the boundary models of brake shoe thrust and wheel displacement are established using displacement and force amplitude functions.

4. The method for analyzing vehicle tread braking friction behavior according to claim 3, characterized in that, The establishment of the brake shoe-wheel finite element model using the finite element method includes: A solid model is created in 3D modeling software based on the actual dimensions of the brake shoe and wheel. Mesh the brake shoe and wheel, and establish a finite element model of the brake shoe-wheel; Assign material properties to the brake shoes and wheel, couple the back of the brake shoes to a reference point above the brake shoes via dynamic coupling, and couple the inner surface of the wheel to a reference point on the wheel axis, so as to apply load and displacement boundary conditions to the brake shoes and wheel.

5. The method for analyzing vehicle tread braking friction behavior according to claim 3, characterized in that, The vehicle dynamics model based on tread braking incorporates the brake shoe and wheel temperature fields and establishes boundary models for brake shoe thrust and wheel displacement using displacement and force amplitude functions, including: Based on the vehicle dynamics model considering tread braking, the real-time brake shoe thrust, friction coefficient, and relative displacement between the brake shoe and the wheel during tread braking under wheel-rail excitation are obtained. The heat flux density of the brake shoe friction surface and the wheel tread at different axial positions over time was obtained by the friction power method, and the temperature distribution of the brake shoe and the wheel was obtained by establishing a heat conduction analysis step. Create a predefined temperature field to introduce the temperature distribution of the brake shoes and wheels, and create a table of displacement and force amplitude functions to set the boundaries of brake shoe thrust and wheel displacement.

6. The method for analyzing vehicle tread braking friction behavior according to claim 1, characterized in that, The analysis of tread friction behavior based on the refined dynamic model of tread braking includes: The temperature distribution of brake shoes and wheels is introduced by sequential coupling simulation method, and a dynamic explicit analysis step is created to simulate the braking friction behavior of vehicle tread, so as to obtain tribological indices that take into account wheel-rail excitation and temperature effects. To obtain tribological evaluation indicators to analyze the stability, reliability and influencing factors of tread braking friction behavior.

7. A device for analyzing the braking friction behavior of vehicle treads, characterized in that, include: The model building module is used to build a vehicle dynamics model that considers tread braking; and to build a refined dynamics model of tread braking based on the vehicle dynamics model that considers tread braking. The analysis module is used to analyze the tread friction behavior based on the refined dynamic model of tread braking.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 6.

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