Multi-field coupling simulation analysis method, device and computer equipment for ballastless track

Abstract

The present application relates to a multi-field coupling simulation analysis method, device, computer device, storage medium, and computer program product for a ballastless track. The method includes: obtaining the attribute parameters of the ballastless track, and constructing a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track. Furthermore, obtaining the first parameter and the second parameter at each time point within a preset time period. The first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located. Thus, based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point, performing a simulation analysis on the ballastless track to obtain a target simulation analysis result. Using this method can improve the accuracy of the simulation analysis result.

Description

Technical Field

[0001] The present application relates to the technical field of ballastless tracks, and particularly to a multi-field coupling simulation analysis method, device, computer equipment, storage medium and computer program product for ballastless tracks. Background Art

[0002] China has a vast territory with large differences in climate and geological conditions. Therefore, the service environment of ballastless tracks in railways is complex. For example, the Harbin-Dalian High-Speed Railway is in a severe cold region, and the Guangzhou-Shenzhen-Hong Kong High-Speed Railway is in a high-temperature and humid environment and soft soil area. The complex environmental effects (such as environmental temperature, humidity, solar radiation, wind speed, rainfall, etc.) will cause the continuous deterioration of ballastless tracks. At the same time, the high-frequency vibration of train loads further accelerates the deterioration and fatigue damage accumulation of ballastless tracks. Under the coupling action of train loads and multiple environmental factors, the structural disease problems of ballastless tracks become increasingly prominent, such as problems like the arching of track slabs and concrete cracking. The structural disease problems of ballastless tracks affect the bearing capacity, stability and durability of the ballastless track structure, and even endanger the safety of train operation in severe cases.

[0003] Therefore, in order to ensure the long-term service performance of ballastless tracks on railways, it is necessary to perform simulation analysis on ballastless tracks to obtain simulation analysis results, that is, to obtain the research results of the disease mechanism of ballastless tracks. However, there is currently a problem that the accuracy of the obtained simulation analysis results is not high. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a multi-field coupling simulation analysis method, device, computer equipment, computer-readable storage medium and computer program product for ballastless tracks that can improve the accuracy of simulation analysis results.

[0005] In a first aspect, the present application provides a multi-field coupling simulation analysis method for ballastless tracks. The method includes:

[0006] Obtain the attribute parameters of the ballastless track;

[0007] Construct a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0008] Obtain the first parameter and the second parameter at each time point within a preset time period. The first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0009] Perform simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point to obtain the target simulation analysis result.

[0010] Second aspect, the present application also provides a multi-field coupling simulation analysis device for ballastless tracks. The device includes:

[0011] A first acquisition module, configured to acquire the attribute parameters of the ballastless track;

[0012] A construction module, configured to construct a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0013] A second acquisition module, configured to acquire a first parameter and a second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0014] An analysis module, configured to perform simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point to obtain a target simulation analysis result.

[0015] Third aspect, the present application also provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps of any of the above methods are implemented.

[0016] Fourth aspect, the present application also provides a computer-readable storage medium. On the computer-readable storage medium, a computer program is stored, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0017] Fifth aspect, the present application also provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0018] The above multi-field coupling simulation analysis method, device, computer device, storage medium and computer program product for ballastless tracks obtain the attribute parameters of the ballastless tracks, and construct a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless tracks and the movement parameters of the trains on the ballastless tracks. Furthermore, the first parameters and the second parameters at each time point within a preset time period are obtained. The first parameters include the spatial coordinates of the ballastless tracks, and the second parameters include the environmental parameters of the environment where the ballastless tracks are located. Thus, based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each of the time points, a simulation analysis of the ballastless tracks is performed to obtain a target simulation analysis result. In the traditional multi-field coupling simulation analysis method for ballastless tracks, the coupling of multiple physical fields cannot be achieved. However, the method in this embodiment can couple the environmental parameters and the movement parameters of the trains based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each time point, that is, multi-field coupling is realized. Therefore, the simulation analysis result obtained in this embodiment is more accurate than the simulation analysis result obtained traditionally, solving the problem of low accuracy of the simulation analysis result obtained traditionally and improving the accuracy of the simulation analysis result. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the internal structure diagram of the computer device in the embodiment of the present application;

[0020] Figure 2 It is the flow schematic diagram of the multi-field coupling simulation analysis method for ballastless tracks in the embodiment of the present application;

[0021] Figure 3 It is the schematic diagram of the geometric structure information of the ballastless track model;

[0022] Figure 4 It is the schematic diagram of the setting of the environmental parameters;

[0023] Figure 5 It is the flow schematic diagram of obtaining a target simulation analysis result in the embodiment of the present application;

[0024] Figure 6 It is the flow schematic diagram of determining the coupling control equation in the embodiment of the present application;

[0025] Figure 7 It is the flow schematic diagram of determining the coupling control equation at the next time point in the embodiment of the present application;

[0026] Figure 8 It is the idea schematic diagram of the multi-field coupling simulation analysis method for ballastless tracks in the embodiment of the present application;

[0027] Figure 9 It is the overall flow schematic diagram of the multi-field coupling simulation analysis method for ballastless tracks in the embodiment of the present application;

[0028] Figure 10 It is the change of the vertical wheel-rail force in the target simulation analysis result;

[0029] Figure 11 It is the load condition at time point 1 in the target simulation analysis result;

[0030] Figure 12 It is the load condition at time point 2 in the target simulation analysis result;

[0031] Figure 13 It is the change of the temperature of structural points i to m in the target simulation analysis result;

[0032] Figure 14 It is the change of the thermal strain tensor of structural points i to m in the target simulation analysis result;

[0033] Figure 15 It is the structural block diagram of the multi-field coupling simulation analysis device for the ballastless track in the embodiment of the present application. Detailed implementation manners

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further details the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] Figure 1 It is the internal structure diagram of the computer device in the embodiment of the present application. The multi-field coupling simulation analysis method for the ballastless track provided in the embodiment of the present application can be applied to a computer device as shown in Figure 1 In the embodiment of the present application, a computer device is provided. The computer device can be a server, a terminal, or a system including a terminal and a server, and is realized through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptop computers, smart phones, tablet computers and portable wearable devices. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The server can be realized by an independent server or a server cluster composed of multiple servers.

[0036] Taking the terminal as an example, its internal structure diagram can be as shown in Figure 1As shown in the figure. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it realizes a multi-field coupling simulation analysis method for ballastless tracks. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the casing of the computer device, or an external keyboard, a touchpad, or a mouse, etc.

[0037] Those skilled in the art can understand that Figure 1 the structure shown in the figure is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0038] In the traditional multi-field coupling simulation analysis method for ballastless tracks, usually, the computer device conducts simulation analysis for a single physical field, such as train loads, and often adopts the single-field sequential full-coupling method, which cannot achieve the coupling of multiple physical fields. Moreover, in the traditional simulation method for ballastless tracks, it is also impossible to achieve the multi-field coupling analysis of the coupling between environmental multi-factors and train moving loads, such as the coupling analysis of temperature and train loads. Therefore, the accuracy of the simulation analysis results obtained by the traditional multi-field coupling simulation analysis method is not high. Based on this, it is necessary to provide a multi-field coupling simulation analysis method for ballastless tracks that can improve the accuracy of the simulation analysis results.

[0039] Figure 2 It is a schematic flowchart of the multi-field coupling simulation analysis method for ballastless tracks in an embodiment of the present application. This method can be applied to Figure 1 the computer device shown in the figure. In one embodiment, as Figure 2 shown in the figure, it includes the following steps:

[0040] S201, obtain the attribute parameters of the ballastless track.

[0041] In this embodiment, the computer device acquires the attribute parameters of the ballastless track. It can be understood that the ballastless track is an integrated system including steel rails, tracks, and the underlying foundation. The underlying foundation includes bridges, subgrades, tunnels, etc. under the ballastless track. Among them, the attribute parameters of the ballastless track describe the attributes of the ballastless track from multiple dimensions such as the material, weight, size, density, and flatness of the ballastless track. The attribute parameters of the ballastless track include the underlying foundation parameters, track parameters, steel rail parameters, and wheel-rail profile parameters of the ballastless track. For example, the track parameters of the ballastless track include C55 concrete, mortar layer, etc.

[0042] S202, construct a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track.

[0043] In this embodiment, the computer device constructs a ballastless track model. Among them, the geometric structure information of the ballastless track can be determined based on the attribute parameters and through modeling software. For example, the computer device uses COMSOL Multiphysics software to construct a three-dimensional refined geometric model of the ballastless track model. It can be understood that this three-dimensional refined geometric model represents the geometric structure information in the ballastless track model, and this three-dimensional refined geometric model also includes the concrete plastic damage model of the track slab and the cohesive force model between the track slab and the mortar layer.

[0044] Figure 3 For the schematic diagram of the geometric structure information of the ballastless track model, as Figure 3 shown, based on the modeling software, the assembly modeling between the box girder (1), base plate (2), mortar layer or self-compacting concrete (3), track slab or ballast bed slab (4), sleeper (5), wide and narrow joints (6), and steel rails A (7), steel rails B (8), steel rails C (9), and steel rails D (10) is completed.

[0045] Specifically, taking the CRTSⅡ slab ballastless track as an example, the computer device uses modeling software to successively establish the rail, sleeper, track slab, wide and narrow joints, CA mortar layer, base slab, and box girder, and simulates the interlayer contact state in the ballastless track by setting contact pairs or consistent pairs on the modeling software. The setting of contact is used to simulate the interfacial bonding performance between vertical layers. For example, a contact pair is set between the track slab and the mortar layer. The process of setting the contact pair also sets the cohesive model parameters for the adhesion and peeling modules in the cohesive model, thereby considering the bonding and peeling failure of each interface. The computer device determines the material parameters and boundary conditions of each component based on the attribute parameters of the ballastless track. For example, the box girder (1) uses C50 concrete, the base slab (2) uses C40 concrete, the CA mortar layer (3) uses cement emulsified asphalt mortar, the track slab (4), sleeper (5), and wide and narrow joints (6) all use C55 concrete, and the 4 rails all use structural steel materials. Among them, considering that the failure of the track slab and wide and narrow joints develops from the elastic stage to the plastic stage, the stress-strain values of the concrete plastic damage model can be selected and input in the material parameters of the track slab and wide and narrow joints.

[0046] Furthermore, the computer device sets a fixed constraint at one end of the box girder and a simply supported constraint at the other end; sets fixed constraints at both ends of the rail and the ballastless track to respectively simulate the seamless rail and the longitudinal connection structure of the track slab; and divides the mesh of the three-dimensional refined geometric model, and directly uses the mapped sweep operation for the irregular geometric figures.

[0047] In this embodiment, to eliminate the influence of boundary conditions and simulate two-way traffic, in the ballastless track model, there are a total of 10 ballastless track slabs. The geometric structure information in the ballastless track model not only includes the irregular shape of the wide and narrow joints at the mesoscopic level and the contact relationship between them, but also can reflect the interaction between the macroscopic track slab and the upper and lower structures, preparing for subsequent simulation analysis. Moreover, in this embodiment, the geometric structure information of the ballastless track model considers the interfacial bonding performance between layers and between slabs, as well as the concrete damage characteristics of the wide and narrow joints. Therefore, the ballastless track model more accurately reflects the actual situation of the ballastless track. Further, the efficiency of obtaining the simulation analysis results and the accuracy of the simulation analysis results are improved.

[0048] The movement parameters of the train on the ballastless track can also be set through the modeling software. The train load parameters include the movement trajectory of the vertical wheel-rail force of the train. Specifically, the computer device determines the movement trajectory of the vertical wheel-rail force of the train through the interpolation function int1. The interpolation function int1 includes the function R of the spatial coordinate time change of the rail, the function Q of the movement trajectory of the wheel-rail force of the train, and the force per unit area FA.

[0049] Among them, the function of the spatial coordinate time change of the rail is R = sqrt[(x-x_(t)) 2 +(y-y_(t)) 2 ]. x_(t) and y_(t) are the spatial coordinates of the rail surface that change with time. Secondly, determine the train wheel-rail force movement trajectory function Q = exp[-(2R 2 ) / (Rb 2 )], where Rb is the Gaussian intensity distribution of the load (e.g. wheel-rail force) with a radius of 4 cm, and is a constant. Unit area force FA = -F(t)·Q, where F(t) is the change of the vertical wheel-rail force over time. The wheel-rail forces of the left and right wheels are different and change dynamically. The direction of the unit area force FA is Figure 3 The Z direction is shown.

[0050] The train load parameters also include the initial position of the train and the train running speed. One way to achieve this is to set the train to cyclic loading, that is, to simulate multiple trains passing through the same track or a train passing through the same track multiple times. For example, for an 8-carriage train model, the number of cycles per year is about 3.5 million times, and the number of cycles per day is 9,600 times. Therefore, it can be assumed that the train cyclic loading time is 6 hours, and the time for one cycle is 0.4s.

[0051] S203, obtaining a first parameter and a second parameter at each time point within a preset time period, wherein the first parameter includes a spatial coordinate of the ballastless track, and the second parameter includes an environmental parameter of an environment in which the ballastless track is located.

[0052] In this embodiment, the computer device obtains the first parameter and the second parameter at each time point within a preset time period. The preset time may be a simulation analysis duration set according to demand, for example, 20 hours. Among them, the first parameter includes the spatial coordinates of the ballastless track, and one way to obtain it is that the computer device can determine the spatial coordinates of the ballastless track based on the train load parameters. The second parameter includes the environmental parameters of the environment in which the ballastless track is located, and the environmental parameters include at least one of temperature parameters, humidity parameters, solar radiation parameters, wind speed parameters, wind direction parameters, salt spray parameters and rainfall parameters. The environmental parameters can be determined by interpolation functions and analytical functions. Figure 4 : is a schematic diagram of setting environmental parameters. In this embodiment, the environmental parameters are temperature parameters. The computer device determines the interpolation function int2 as the temperature parameter. The interpolation function int2 is a linear function that represents the change of temperature over time, such as Figure 4 As shown, in this embodiment, the initial temperature is 30°C, and the temperature is increased from 30°C to 50°C in 6 hours, with a temperature increase of 10°C every 2 hours.

[0053] S204. Based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each time point, perform a simulation analysis on the ballastless track to obtain the target simulation analysis result.

[0054] In this embodiment, the computer device, based on the modeling software, sets the loading time and step size of the temperature parameter int1 and the moving parameter int2 of the train to be the same, realizing bidirectional coupling. More specifically, the computer device, based on the modeling software, couples the two physical fields of solid mechanics and solid heat transfer, realizing the coupling of environmental factors (i.e., int2) and the moving load of the train (i.e., int1).

[0055] Furthermore, the computer device, based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each time point, performs a simulation analysis on the ballastless track to obtain the target simulation analysis result. The target simulation analysis result is the structural response of the ballastless track, including the dynamic response and the thermodynamic response of the structure of the ballastless track. Specifically, the target simulation analysis result includes at least one of the responses of displacement, velocity, acceleration, wheel-rail force, stress and temperature of the ballastless track.

[0056] The multi-field coupling simulation analysis method for the ballastless track provided in this embodiment obtains the attribute parameters of the ballastless track, and constructs a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless track and the moving parameters of the train on the ballastless track. Furthermore, the first parameters and the second parameters at each time point within a preset time period are obtained. The first parameters include the spatial coordinates of the ballastless track, and the second parameters include the environmental parameters of the environment where the ballastless track is located. Thus, based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each time point, a simulation analysis is performed on the ballastless track to obtain the target simulation analysis result. In the traditional multi-field coupling simulation analysis method for the ballastless track, the coupling of multiple physical fields cannot be achieved. However, the method in this embodiment can couple the environmental parameters and the moving parameters of the train based on the attribute parameters, the ballastless track model, the first parameters and the second parameters at each time point, that is, multi-field coupling is realized. Therefore, the simulation analysis result obtained in this embodiment is more accurate than the simulation analysis result obtained traditionally, solving the problem of low accuracy of the simulation analysis result obtained traditionally due to insufficient consideration of factors, and improving the accuracy of the simulation analysis result.

[0057] Figure 5 This is a schematic flowchart of a process for obtaining the target simulation analysis result in an embodiment of the present application. Refer to Figure 3 , this embodiment relates to an optional implementation manner of how to obtain the simulation analysis result. On the basis of the above embodiment, the above S204 includes the following steps:

[0058] S501. Determine the coupled control equations of the ballastless track at each time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point.

[0059] In this embodiment, the computer device determines the coupled control equations of the ballastless track at each time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point. For example, if the preset time period is 1 hour, each time point can be every minute within 1 hour or every 10 minutes within 1 hour. At the first time point within this 1 hour, the computer device determines the coupled control equation of the ballastless track at the first time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the first time point. And so on, at the t-th time point within this hour, the computer device determines the coupled control equation of the ballastless track at the t-th time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the t-th time point, where t is an integer greater than or equal to 1. One possible implementation is that the computer device determines the coupled control equation of the ballastless track through the full coupling method, and the coupled control equation of the ballastless track describes the coupled response of the structure of the ballastless track changing with time.

[0060] S502. Determine the simulation analysis results of the ballastless track at each time point based on the coupled control equations of the ballastless track at each time point, and use the simulation analysis results at each time point as the target simulation analysis results.

[0061] In this embodiment, the computer device determines the simulation analysis results of the ballastless track at each time point based on the coupled control equations of the ballastless track at each time point. Among them, one possible implementation is as follows: Step (1), the computer device determines the mechanical parameters of the train on the ballastless track at each time point based on the coupled control equations of the ballastless track at each time point, such as the wheel-rail force and creep force of the train on the ballastless track.

[0062] Step (2), the computer device determines the position of the train wheels on the rail at each time point, and determines the dynamic response of the ballastless track at each time point based on the mechanical parameters of the train on the ballastless track at each time point and the position of the train wheels on the rail at each time point, such as the displacement, speed, and acceleration of the rail. It can be understood that the dynamic response of the ballastless track at each time point includes the dynamic response of the rail at each time point and the dynamic response of the train at each time point. Among them, the computer device assigns the mechanical parameters of the train at each time point to each rail node to determine the dynamic response of the rail at each time point.

[0063] Step (3), the computer device also determines the thermodynamic response of the ballastless track at each time point based on the coupled control equations of the ballastless track at each time point, such as the temperature and thermal strain tensor of the ballastless track.

[0064] Step (4), the computer device uses the simulation analysis results at each time point, for example, the dynamic response and thermodynamic response of the ballastless track at each time point, as the target simulation analysis results.

[0065] In this embodiment, based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point, the coupled control equation of the ballastless track at each time point is determined. Based on the coupled control equation of the ballastless track at each time point, the simulation analysis results of the ballastless track at each time point are determined, and the simulation analysis results at each time point are used as the target simulation analysis results. Since multiple factors are coupled in this embodiment, the accuracy of the simulation analysis results is improved.

[0066] Figure 6 It is a schematic flowchart of a process for determining a coupled control equation in an embodiment of the present application. Refer to Figure 3 , this embodiment relates to an optional implementation manner of how to determine the coupled control equation of the ballastless track at the next time point. On the basis of the above embodiment, S501 includes the following steps:

[0067] S601, according to the wheel-rail force at the previous time point of the current time point of the ballastless track and the first parameter and the second parameter at the current time point, determine the wheel-rail force of the ballastless track at the current time point.

[0068] In this embodiment, t is defined as the current time point, and t is an integer greater than or equal to 1. It can be understood that the current time point t represents the time point corresponding to the simulation analysis result that the computer device is determining within a preset time period. For example, if the computer device is determining the simulation analysis result of the first minute within 1 hour, then the current time point t = 1. Among them, when t = 1, it can represent the 1st second or the 1st minute, and this embodiment does not make any restrictions.

[0069] The computer device determines the wheel-rail force of the ballastless track at the t time point according to the wheel-rail force at the t - 1 time point of the ballastless track and the first parameter and the second parameter at the t time point. It should be noted that t is an integer greater than or equal to 1. When t = 1, t - 1 = 0, and the wheel-rail force corresponding to t - 1 at this time is an initial preset value. One possible implementation is that the computer device determines the wheel-rail force of the ballastless track at the 0 time point according to the movement parameter int1 of the train on the ballastless track. It can be understood that the computer device will store the wheel-rail force at each time point for subsequent calculations.

[0070] S602, according to the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point, use the ballastless track model to determine the coupled control equation of the ballastless track at the current time point, where the current time point is any time point among each time point.

[0071] In this embodiment, the computer device determines the coupling control equation of the ballastless track at time point t based on the wheel-rail force of the ballastless track at time point t and the second parameter at time point t. For example, the computer device can determine the coupling control equation of the ballastless track at time point t according to the finite element analysis method.

[0072] This embodiment determines the wheel-rail force of the ballastless track at the current time point based on the wheel-rail force at the previous time point of the current time point of the ballastless track and the first parameter and the second parameter at the current time point, and determines the coupling control equation of the ballastless track at the current time point based on the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point, where the current time point is any time point among each time point. Since this embodiment can determine the coupling control equation of each time point, and then can determine the simulation analysis result of each time point according to the coupling control equation of each time point, the accuracy of the target simulation analysis result is further improved.

[0073] Figure 7 It is a schematic flow chart of a method for determining the coupling control equation of the next time point in an embodiment of the present application. Refer to Figure 7 This embodiment relates to an optional implementation manner of how to determine the coupling control equation of the ballastless track at the next time point. On the basis of the above embodiment, the multi-field coupling simulation analysis method of the above ballastless track further includes the following steps:

[0074] S701, based on the coupling control equation of the ballastless track at the current time point, determine the first parameter of the next time point of the current time.

[0075] In this embodiment, after the computer device determines the coupling control equation of the ballastless track at time point t, it can determine the first parameter of the ballastless track at time point t + 1 based on the coupling control equation of the ballastless track at time point t.

[0076] S702, based on the attribute parameter, the ballastless track model, the first parameter of the next time point, and the second parameter, determine the coupling control equation of the ballastless track at the next time point.

[0077] In this embodiment, the first parameter and the second parameter of the ballastless track at the initial time point (t = 0) are set values. Then, based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the initial time point, the computer device determines the coupling control equation of the ballastless track at the first time point (t = 1) and the first parameter of the ballastless track at the first time point (t = 1). Further, the computer device determines the coupling control equation of the ballastless track at the second time point (t = 2) and the first parameter of the ballastless track at the second time point (t = 2) based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the first time point, and so on, which will not be elaborated here.

[0078] Optionally, the above multi-field coupling simulation analysis method for the ballastless track further includes the following steps:

[0079] If the duration of the simulation analysis of the ballastless track is less than the preset time period, the current time point is updated to obtain a new current time point, and based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, the coupling control equation of the ballastless track at the new time point is determined, and based on the coupling control equation of the ballastless track at the new time point, the simulation analysis result of the ballastless track at the new time point is determined.

[0080] In this embodiment, if the duration of the simulation analysis of the ballastless track by the computer device is less than the set preset time period, for example, the computer has been performing the simulation analysis of the ballastless track for 1 h, but the preset time period is 3 h from 2 o'clock to 5 o'clock, then the computer device updates the current time point to obtain a new current time point. For example, when the computer device is at t = 3 (i.e., the current time point t = 3), based on the attribute parameters, the ballastless track model, the first parameter at t = 3 and the second parameter at t = 3, the coupling control equation of the ballastless track at t = 3 is determined, and then based on the coupling control equation of the ballastless track at t = 3, the simulation analysis result of the ballastless track at t = 3 is obtained. If the duration of the simulation analysis of the ballastless track by the computer device is less than the set preset time period at this time, the computer device updates the current time point to obtain a new current time point t = 4, based on the attribute parameters, the ballastless track model, the first parameter at t = 4 and the second parameter at t = 4, determines the coupling control equation of the ballastless track at t = 4, and based on the coupling control equation of the ballastless track at t = 4, obtains the simulation analysis result of the ballastless track at t = 4. And so on, which will not be elaborated in this embodiment.

[0081] Further, if the duration of the computer device's simulation analysis of the ballastless track is equal to the set preset time period, the computer device will stop the simulation analysis and use the simulation analysis results at each of the said time points as the target simulation analysis results. It can be understood that during the process of the computer device's simulation analysis of the ballastless track, manual intervention can also be used to interrupt and restart.

[0082] In this embodiment, if the duration of the simulation analysis of the ballastless track is less than the preset time period, the current time point is updated to obtain a new current time point, and based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, the coupled control equation of the ballastless track at the new time point is determined, and based on the coupled control equation of the ballastless track at the new time point, the simulation analysis result of the ballastless track at the new time point is determined. Since the current time point in this embodiment is a continuously updated process, the computer device can determine the simulation analysis results at each time point within the duration, thereby improving the accuracy of the finally obtained target simulation analysis results.

[0083] Optionally, the above S601 can also be implemented in the following manner:

[0084] Based on the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point, determine the wheel-rail force of the ballastless track at the current time point.

[0085] In this embodiment, the computer device can determine the wheel-rail force of the ballastless track at the current time point (t time point) based on the wheel-rail force of the ballastless track at the previous time point (t-1 time point), the first parameter at the current time point (t time point), and the simulation analysis result of the ballastless track at the previous time point (t-1 time point). That is to say, the simulation analysis results at each time point will affect the simulation analysis results at the next time point of each time point, which conforms to the dynamic change process of the actual ballastless track.

[0086] This embodiment determines the wheel-rail force of the ballastless track at the current time point based on the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point, further improving the accuracy of the simulation analysis results.

[0087] To more clearly explain the multi-field coupling simulation analysis method of the ballastless track in this embodiment, the following is combined with Figure 8 and Figure 9 for description. Figure 8 is a schematic diagram of the idea of the multi-field coupling simulation analysis method of the ballastless track in the embodiment of the present application. As Figure 8As shown, the computer device obtains the attribute parameters of the ballastless track, determines the train dynamics module and the wheel-rail interaction module using Matlab, and calculates the wheel-rail forces of the ballastless track at each time point based on the attribute parameters of the ballastless track, that is, the time history of the wheel-rail forces. It can be understood that the wheel-rail forces are moving loads that vary with time. Other software or languages can also be used to determine the train dynamics module and the wheel-rail interaction module, which is not limited in this embodiment. More specifically, the computer device constructs a ballastless track model using modeling software, and based on the second parameter at t = 1 and the wheel-rail forces calculated by Matlab at t = 1, performs multi-physics field coupling through the ballastless track model, and then determines the coupling control equation of the ballastless track at t = 1. Further, the computer device determines the simulation analysis results of the ballastless track at t = 1 based on the coupling control equation of the ballastless track at t = 1, such as the displacement of the rail at t = 1. The computer returns the displacement of the rail at t = 1 to the wheel-rail interaction module, and then recalculates the time history of the wheel-rail forces at t = 2, and then determines the coupling control equation of the ballastless track at t = 2, so as to determine the simulation analysis results of the ballastless track at t = 2, and repeat the multi-field coupling calculation and analysis in this way.

[0088] Figure 9 This is a schematic diagram of the overall process of the multi-field coupling simulation analysis method for the ballastless track in the embodiment of the present application. The computer device determines the train dynamics module and the wheel-rail interaction module through Matlab. The train dynamics module obtains the attribute parameters of the ballastless track, such as train data. The wheel-rail interaction module obtains the second parameter, such as the spatial coordinates of the train and the wheels, and determines the time history of the wheel-rail forces based on the unevenness parameter in the attribute parameters, such as the random geometric unevenness parameter of the track. It can be understood that the random geometric unevenness parameter of the track represents the flatness of the ballastless track. The computer device constructs a ballastless track model using modeling software and inputs the third parameter into the ballastless track model.

[0089] Further, the ballastless track model combines the wheel-rail forces and solves the coupling control equation of the ballastless track through the full coupling method. According to the coupling control equation of the ballastless track, the simulation analysis results of the ballastless track are determined. The simulation analysis results include the dynamic response and thermodynamic response of the ballastless track. For example, the computer device determines the mechanical parameters of the ballastless track, such as the wheel-rail forces, creep forces, and torques of the train. Then the computer device determines the position of the train wheels on the track, distributes the wheel-rail forces to the rail nodes, and determines the displacement, velocity, and acceleration of the rail. Thus, the computer device determines the dynamic response of the ballastless track. The computer device also feeds back the simulation analysis results of the ballastless track, such as the rail displacement, to the wheel-rail interaction module so that the wheel-rail interaction module determines the wheel-rail forces at the next time point based on the rail displacement at the previous time point.

[0090] Finally, the computer device determines whether to end the simulation analysis according to the preset judgment conditions. For example, it determines whether the duration of the simulation analysis of the ballastless track is equal to the preset time period. If the judgment conditions are met, the computer device ends the simulation analysis and obtains the target simulation analysis result. It can be understood that the obtained target simulation analysis result is the simulation analysis result based on the multi-physical field coupling of the train load and environment of the ballastless track. If the judgment conditions are not met, the computer device continues to update the time point for the simulation analysis.

[0091] More specifically, one implementable way is that the computer device performs the simulation analysis according to the following steps.

[0092] S1: Obtain the attribute parameters of the ballastless track, such as train parameters, track parameters, rail parameters, wheel-rail profile parameters, and track irregularity parameters, etc.

[0093] S2: Construct a ballastless track model, which includes the preset train operation termination time, train operation speed, train initial position, and the integration step length of the wheel-rail force of the ballastless track, etc.

[0094] S3: Use the attribute parameters obtained in step S1 to calculate the wheel-rail force of the ballastless track and determine the coupling control equation of the ballastless track. Substitute the wheel-rail force of the ballastless track as the load into the coupling control equation of the ballastless track, and use the fast explicit numerical integration method, that is, the Zhai method, to calculate the dynamic responses of each component of the ballastless track in the next integration step, such as displacement, speed, acceleration and other responses. Specifically, convert the initial static load into the load of the rail nodes of the track model in the modeling software, and act on the rail nodes through the status register to determine the dynamic response of the ballastless track, and then obtain the displacement of the rail nodes where the train is located in the next integration step to determine the spatial coordinates of the rail.

[0095] S4: Read the displacement data of the rail nodes through the status register, convert it into the displacement of the rail at the wheel-rail contact point through the beam element shape function, and then combine the train displacement obtained by integrating with the Zhai method and the track irregularity corresponding to this time step length. Based on the Hertz nonlinear contact, Kalker linear creep force theory and the wheel-rail spatial contact geometric relationship, calculate the wheel-rail force and creep force at the next time point.

[0096] S5: Then apply the wheel-rail force calculated in S4 as the new load to the train and track structure. When applying it to the rail, it is necessary to equivalently convert and distribute the load at the wheel-rail contact point to the adjacent sleeper positions. That is, by repeating steps S3 and S4, the simulation analysis result at the next time point can be obtained.

[0097] S6: Record the dynamic response data of the train, track and wheel-rail force in the ballastless track obtained in S3 - S5, and store the data in a TXT file.

[0098] S7: Determine whether the duration of the simulation analysis is less than the set duration threshold. If it is less than the set duration threshold, continue to execute steps S3 to S7; if it is equal to the set duration threshold, use the file obtained in S6 as the target simulation analysis result.

[0099] In the multi-field coupling simulation analysis method of the ballastless track provided in this embodiment, since it is a multi-physical field coupling, the target simulation analysis result includes at least one of the displacement, velocity, acceleration, wheel-rail force, stress, and temperature of the ballastless track. It should be noted that the computer device can output the simulation analysis result as a file in a fixed format according to the user's needs, such as APP, TXT, JPG, etc., and this embodiment does not make any restrictions.

[0100] Figure 10 For the change of the vertical wheel-rail force in the target simulation analysis result, as Figure 10 shown, Figure 10 the abscissa in Figure 10 is time, with the unit of second, Figure 10 and the ordinate in

[0101] Figure 11 is the vertical wheel-rail force of the wheels of the train on the ballastless track, with the unit of Newton. Combining Figure 12 Figure 11 and Figure 12 shown, time point 1 is t = 0.015s, time point 2 is t = 1.605s, and the load includes the stress and wheel-rail force of the ballastless track. Figure 11 Figure 12 In -4 N / m 2 ~1.45×10 5 ×10 5 N / m 2 range. Figure 12 In -3 N / m 2 ~9.13×10 4 ×10 4 N / m 2 range.

[0102] The computer device can compare the simulation analysis results of each structural point based on the various structural points in the ballastless track model. For example, the computer device selects the internal vertex i of the track slab, the internal midpoint j of the track slab, the internal midpoint k of the mortar layer, and the internal midpoint m of the base slab, and compares the changes in the thermodynamic response and dynamic response of these 4 structural points over time.

[0103] Figure 13 is the change in the temperature of the structural points i to m in the target simulation analysis result. As Figure 13 shown, the temperatures of the structural points i to m all increase continuously with time and the ambient temperature. Combining Figure 13 , it can be seen that the temperature of the internal vertex of the track slab is the highest, followed by the temperature of the internal midpoint of the track slab, while the internal temperature of the base slab is the lowest, and there is an obvious vertical temperature gradient in the ballastless track from top to bottom.

[0104] Figure 14 is the change in the thermal strain tensor of the structural points i to m in the target simulation analysis result. The thermal strain tensor represents the changes in the shape and size inside the structure of the ballastless track. As Figure 14 shown, the thermal strain of the structural points i to m increases continuously with the increase in the ambient temperature, and the thermal strain tensor, that is, the temperature stress, decreases continuously vertically downward along the structure of the ballastless track.

[0105] It should be noted that Figures 10 to 14 is only for illustrative purposes and does not represent real data.

[0106] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0107] Based on the same inventive concept, an embodiment of the present application further provides a multi-field coupling simulation analysis device for a ballastless track for implementing the multi-field coupling simulation analysis method of the ballastless track involved above. The solution provided by this device for solving problems is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the multi-field coupling simulation analysis device for a ballastless track provided below can refer to the limitations on the multi-field coupling simulation analysis method of the ballastless track in the above text, and will not be repeated here.

[0108] Figure 15 It is a structural block diagram of the multi-field coupling simulation analysis device for a ballastless track in an embodiment of the present application. In the embodiment of the present application, as Figure 15 shown, a multi-field coupling simulation analysis device 1500 for a ballastless track is provided, including: a first acquisition module 1501, a construction module 1502, a second acquisition module 1503, and an analysis module 1504, where:

[0109] The first acquisition module 1501 is configured to acquire the attribute parameters of the ballastless track;

[0110] The construction module 1502 is configured to construct a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0111] The second acquisition module 1503 is configured to acquire the first parameter and the second parameter at each time point within a preset time period. The first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0112] The analysis module 1504 is configured to perform simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point to obtain a target simulation analysis result.

[0113] The multi-field coupling simulation analysis device for ballastless tracks provided in this embodiment obtains the attribute parameters of the ballastless tracks and constructs a ballastless track model based on the attribute parameters. The ballastless track model includes the geometric structure information of the ballastless tracks and the movement parameters of the trains on the ballastless tracks. Furthermore, the first parameter and the second parameter at each time point within a preset time period are obtained. The first parameter includes the spatial coordinates of the ballastless tracks, and the second parameter includes the environmental parameters of the environment where the ballastless tracks are located. Thus, based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point, a simulation analysis of the ballastless tracks is carried out to obtain the target simulation analysis result. In the traditional multi-field coupling simulation analysis method for ballastless tracks, the coupling of multiple physical fields cannot be achieved. However, the method in this embodiment can couple the environmental parameters and the movement parameters of the trains based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point, that is, multi-field coupling is realized. Therefore, the simulation analysis result obtained in this embodiment is more accurate than the simulation analysis result obtained traditionally, solving the problem that the accuracy of the simulation analysis result obtained traditionally is not high due to insufficient consideration factors, and improving the accuracy of the simulation analysis result.

[0114] Optionally, the analysis module 1504 includes:

[0115] The first determination unit is configured to determine the coupling control equation of the ballastless tracks at each time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point.

[0116] The second determination unit is configured to determine the simulation analysis result of the ballastless tracks at each time point based on the coupling control equation of the ballastless tracks at each time point, and use the simulation analysis results at each time point as the target simulation analysis result.

[0117] Optionally, the first determination unit includes:

[0118] The first determination subunit is configured to determine the wheel-rail force of the ballastless tracks at the current time point according to the wheel-rail force at the previous time point of the current time point of the ballastless tracks and the first parameter and the second parameter at the current time point.

[0119] The second determination subunit is configured to determine the coupling control equation of the ballastless tracks at the current time point according to the wheel-rail force of the ballastless tracks at the current time point and the second parameter at the current time point by using the ballastless track model, where the current time point is any time point among each time point.

[0120] Optionally, the multi-field coupling simulation analysis device 1500 for the ballastless tracks further includes:

[0121] The first determination module is configured to determine the first parameter at the next time point of the current time based on the coupling control equation of the ballastless tracks at the current time point.

[0122] A second determination module, configured to determine a coupling control equation of the ballastless track at the next time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the next time point.

[0123] Optionally, the multi-field coupling simulation analysis device 1500 of the ballastless track further includes:

[0124] An update module, configured to update the current time point to obtain a new current time point if the duration of the simulation analysis of the ballastless track is less than a preset time period, and determine a coupling control equation of the ballastless track at the new time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, and determine a simulation analysis result of the ballastless track at the new time point based on the coupling control equation of the ballastless track at the new time point.

[0125] Optionally, the first determination subunit is specifically configured to determine the wheel-rail force of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point.

[0126] Each module in the above multi-field coupling simulation analysis device of the ballastless track can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0127] In one embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the following steps are implemented:

[0128] Obtain the attribute parameters of the ballastless track;

[0129] Construct a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0130] Obtain the first parameter and the second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0131] Perform simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each of the time points to obtain a target simulation analysis result.

[0132] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0133] Based on the property parameters, the ballastless track model, the first parameter and the second parameter at each of the time points, determine the coupling control equations of the ballastless track at each of the time points;

[0134] Based on the coupling control equations of the ballastless track at each of the time points, determine the simulation analysis results of the ballastless track at each of the time points, and use the simulation analysis results at each of the time points as the target simulation analysis results.

[0135] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0136] According to the wheel-rail force at the previous time point of the current time point of the ballastless track and the first parameter and the second parameter at the current time point, determine the wheel-rail force of the ballastless track at the current time point;

[0137] According to the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point, use the ballastless track model to determine the coupling control equation of the ballastless track at the current time point, where the current time point is any one of the time points.

[0138] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0139] Based on the coupling control equation of the ballastless track at the current time point, determine the first parameter at the next time point of the current time;

[0140] Based on the property parameters, the ballastless track model, the first parameter and the second parameter at the next time point, determine the coupling control equation of the ballastless track at the next time point.

[0141] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0142] If the duration of the simulation analysis of the ballastless track is less than the preset time period, update the current time point to obtain a new current time point, and based on the property parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, determine the coupling control equation of the ballastless track at the new time point, and based on the coupling control equation of the ballastless track at the new time point, determine the simulation analysis result of the ballastless track at the new time point.

[0143] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0144] Determine the wheel-rail force of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point.

[0145] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0146] Obtain the attribute parameters of the ballastless track;

[0147] Construct a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0148] Obtain the first parameter and the second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0149] Perform a simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point to obtain a target simulation analysis result.

[0150] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0151] Determine the coupling control equation of the ballastless track at each time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each time point;

[0152] Determine the simulation analysis result of the ballastless track at each time point based on the coupling control equation of the ballastless track at each time point, and use the simulation analysis result at each time point as the target simulation analysis result.

[0153] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0154] Determine the wheel-rail force of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the previous time point of the current time point, the first parameter and the second parameter at the current time point;

[0155] Determine the coupling control equation of the ballastless track at the current time point by using the ballastless track model according to the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point, where the current time point is any one of the time points.

[0156] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0157] Based on the coupling control equation of the ballastless track at the current time point, determine the first parameter at the next time point of the current time;

[0158] Based on the attribute parameter, the ballastless track model, the first parameter and the second parameter at the next time point, determine the coupling control equation of the ballastless track at the next time point.

[0159] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0160] If the duration of the simulation analysis of the ballastless track is less than the preset time period, update the current time point to obtain a new current time point, and based on the attribute parameter, the ballastless track model, the first parameter and the second parameter at the new current time point, determine the coupling control equation of the ballastless track at the new time point, and based on the coupling control equation of the ballastless track at the new time point, determine the simulation analysis result of the ballastless track at the new time point.

[0161] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0162] According to the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point and the simulation analysis result of the ballastless track at the previous time point, determine the wheel-rail force of the ballastless track at the current time point.

[0163] In one embodiment, a computer program product is provided, including a computer program, which when executed by a processor implements the following steps:

[0164] Obtain the attribute parameters of the ballastless track;

[0165] Based on the attribute parameters, construct a ballastless track model, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track;

[0166] Obtain the first parameter and the second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located;

[0167] Based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each of the time points, perform a simulation analysis on the ballastless track to obtain a target simulation analysis result.

[0168] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0169] Based on the property parameters, the ballastless track model, the first parameters and the second parameters at each of the time points, determine the coupling control equations of the ballastless track at each of the time points;

[0170] Based on the coupling control equations of the ballastless track at each of the time points, determine the simulation analysis results of the ballastless track at each of the time points, and use the simulation analysis results at each of the time points as the target simulation analysis results.

[0171] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0172] Based on the wheel-rail force at the previous time point of the current time point of the ballastless track and the first parameters and the second parameters at the current time point, determine the wheel-rail force of the ballastless track at the current time point;

[0173] Based on the wheel-rail force of the ballastless track at the current time point and the second parameters at the current time point, use the ballastless track model to determine the coupling control equation of the ballastless track at the current time point, where the current time point is any one of the time points.

[0174] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0175] Based on the coupling control equation of the ballastless track at the current time point, determine the first parameter at the next time point of the current time;

[0176] Based on the property parameters, the ballastless track model, the first parameter and the second parameter at the next time point, determine the coupling control equation of the ballastless track at the next time point.

[0177] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0178] If the continuous duration of the simulation analysis of the ballastless track is less than the preset time period, update the current time point to obtain a new current time point, and based on the property parameters, the ballastless track model, the first parameters and the second parameters at the new current time point, determine the coupling control equation of the ballastless track at the new time point, and based on the coupling control equation of the ballastless track at the new time point, determine the simulation analysis result of the ballastless track at the new time point.

[0179] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0180] Determine the wheel-rail force of the ballastless track at the current time point based on the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point.

[0181] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0182] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., and are not limited thereto.

[0183] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0184] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A multi-field coupling simulation analysis method for ballastless tracks, characterized in that The method includes: Obtaining the attribute parameters of the ballastless track; the attribute parameters include the lower foundation parameters, track parameters, rail parameters, and wheel-rail profile parameters of the ballastless track; Constructing a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track; Obtaining the first parameter and the second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located; Performing a simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each of the time points to obtain a target simulation analysis result; The performing a simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each of the time points to obtain a target simulation analysis result includes: Determining the wheel-rail force of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point; Determining the coupling control equation of the ballastless track at the current time point by using the ballastless track model according to the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point, where the current time point is any one of the time points; Determining the first parameter at the next time point of the current time based on the coupling control equation of the ballastless track at the current time point; Determining the coupling control equation of the ballastless track at the next time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the next time point; Determining the simulation analysis results of the ballastless track at each of the time points based on the coupling control equations of the ballastless track at each of the time points, and using the simulation analysis results at each of the time points as the target simulation analysis result.

2. The method according to claim 1, wherein The method further includes: If the duration of the simulation analysis of the ballastless track is less than the preset time period, updating the current time point to obtain a new current time point, and determining the coupling control equation of the ballastless track at the new time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, and determining the simulation analysis result of the ballastless track at the new time point based on the coupling control equation of the ballastless track at the new time point.

3. The method according to claim 1, wherein The obtaining the first parameter and the second parameter at each time point within a preset time period includes: Determining the spatial coordinates of the ballastless track based on the train load parameters; the train load parameters include the initial position of the train on the ballastless track, the train running speed, and the movement trajectory of the vertical wheel-rail force; Determining the environmental parameters of the environment where the ballastless track is located through an interpolation function and an analytical function; the environmental parameters include at least one of a temperature parameter, a humidity parameter, a solar radiation parameter, a wind speed parameter, a wind direction parameter, a salt fog parameter, and a rainfall parameter.

4. The method according to any one of claims 1 to 3, characterized in that, The target simulation analysis result includes at least one response among the displacement, velocity, acceleration, wheel-rail force, stress, and temperature of the ballastless track.

5. The method according to any one of claims 1 to 3, characterized in that The ballastless track model includes the train operation termination time, train operation speed, train initial position, and the integration step length of the wheel-rail force of the ballastless track.

6. A multi-field coupling simulation analysis device for ballastless track, characterized in that The device includes: A first acquisition module, configured to acquire the attribute parameters of the ballastless track; the attribute parameters include the lower foundation parameters, track parameters, rail parameters, and wheel-rail profile parameters of the ballastless track; A construction module, configured to construct a ballastless track model based on the attribute parameters, where the ballastless track model includes the geometric structure information of the ballastless track and the movement parameters of the train on the ballastless track; A second acquisition module, configured to acquire a first parameter and a second parameter at each time point within a preset time period, where the first parameter includes the spatial coordinates of the ballastless track, and the second parameter includes the environmental parameters of the environment where the ballastless track is located; An analysis module, configured to perform a simulation analysis on the ballastless track based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at each of the time points to obtain a target simulation analysis result; The analysis module is further configured to determine the wheel-rail force of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the previous time point, the first parameter at the current time point, and the simulation analysis result of the ballastless track at the previous time point; determine the coupling control equation of the ballastless track at the current time point according to the wheel-rail force of the ballastless track at the current time point and the second parameter at the current time point by using the ballastless track model, where the current time point is any one of the time points; determine the first parameter at the next time point based on the coupling control equation of the ballastless track at the current time point; determine the coupling control equation of the ballastless track at the next time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the next time point; determine the simulation analysis results of the ballastless track at each of the time points based on the coupling control equations of the ballastless track at each of the time points, and use the simulation analysis results at each of the time points as the target simulation analysis result.

7. The device according to claim 6, characterized in that, The device further includes: An update module, configured to, if the continuous duration of performing the simulation analysis on the ballastless track is less than the preset time period, update the current time point to obtain a new current time point, determine the coupling control equation of the ballastless track at the new time point based on the attribute parameters, the ballastless track model, the first parameter and the second parameter at the new current time point, and determine the simulation analysis result of the ballastless track at the new time point based on the coupling control equation of the ballastless track at the new time point.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer program product comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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