Simulation analysis method and device for ventilation system of track vehicle

Abstract

The application provides a simulation analysis method and device for a ventilation system of a rail vehicle, wherein the method comprises: determining, for each type of fan, a flow-pressure curve corresponding to the type of fan under an air conditioning unit finite element grid model; combining the air conditioning unit finite element grid model with different types of fans and various rail vehicle finite element grid models to obtain a plurality of first simulation examples; for each first simulation example, based on the flow-pressure curve of the fan corresponding to the first simulation example, obtaining the wind volume-pressure curve generated inside the rail vehicle by the fan acting on the rail vehicle finite element grid model corresponding to the first simulation example; and determining a ventilation system design scheme for the rail vehicle based on the wind volume-pressure curve corresponding to each first simulation example. The best design scheme of the ventilation system is determined.

Description

Technical Field

[0001] This application relates to the field of ventilation technology for rail vehicles, and more specifically, to a simulation analysis method and apparatus for ventilation systems of rail vehicles. Background Technology

[0002] With the development of subway vehicles, users have placed higher demands on the comfort of the environment inside the carriages. In order to create a comfortable passenger environment, the air conditioning system should be able to achieve good airflow organization while meeting user needs such as low noise and low energy consumption.

[0003] Currently, during the vehicle prototype testing phase, issues frequently arise where indicators such as airflow and positive pressure inside the vehicle fail to meet requirements. This is because the ventilation system has not achieved proper matching and optimized design, and it is difficult to make corrections in actual vehicles. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a simulation analysis method and device for ventilation systems of rail vehicles, which can obtain the optimal ventilation system design scheme by combining and simulating the air conditioning unit, fan and rail vehicle, solve the problem that the ventilation system in the prior art has failed to achieve good matching and optimization design, and achieve the effect of determining the optimal design scheme of the ventilation system.

[0005] In a first aspect, embodiments of this application provide a simulation analysis method for a ventilation system of a rail vehicle. The method includes: determining a finite element mesh model of an air conditioning unit, and constructing a fan of the air conditioning unit in the finite element mesh model; for each type of fan, determining the flow-pressure curve corresponding to that type of fan under the finite element mesh model of the air conditioning unit; determining multiple finite element mesh models of the rail vehicle; combining the finite element mesh models of the air conditioning unit with different types of fans with the various finite element mesh models of the rail vehicle to obtain multiple first simulation cases; for each first simulation case, based on the flow-pressure curve of the fan corresponding to the first simulation case, obtaining the air volume-pressure curve generated inside the rail vehicle by the corresponding fan acting on the finite element mesh model of the rail vehicle corresponding to the first simulation case; and determining a ventilation system design scheme for the rail vehicle based on the air volume-pressure curves corresponding to each first simulation case.

[0006] Optionally, the flow-pressure curve corresponding to this type of fan under the finite element mesh model of the air conditioning unit is determined by the following method: determining the flow-pressure curve of the finite element network model of the air conditioning unit; obtaining multiple output flow values ​​of this type of fan under the flow-pressure curve of the finite element mesh model of the air conditioning unit and the pressure values ​​inside the fan corresponding to each output flow value; fitting the multiple output flow values ​​and multiple pressure values ​​to obtain the flow-pressure curve corresponding to this type of fan.

[0007] Optionally, the flow-pressure curve of the finite element network model of the air conditioning unit is determined by the following methods: based on the construction of the finite element mesh model of the air conditioning unit, the overall internal resistance and the fresh air inlet resistance of the air conditioning unit are determined; a resistance surface is set in the finite element mesh model of the air conditioning unit to represent the overall internal resistance and the fresh air inlet resistance of the air conditioning unit; multiple wind speed values ​​and the corresponding resistance values ​​of the finite element mesh model of the air conditioning unit are obtained; the multiple wind speed values ​​and multiple resistance values ​​are fitted to obtain the flow-pressure curve of the finite element mesh model of the air conditioning unit.

[0008] Optionally, multiple finite element mesh models of the track vehicle are determined by the following method: obtaining multiple geometric models of the track vehicle; for each geometric model, performing the following steps: using the inner surface of the geometric model as a reference, retaining the airflow passage structure in the geometric model, simplifying the non-airflow passage structure in the geometric model to obtain the optimized model corresponding to the geometric model, performing finite element analysis on the optimized model to obtain the finite element mesh model of the track vehicle corresponding to the geometric model, wherein the airflow passage structure is the structure in the geometric model that affects airflow, and the non-airflow passage structure is simplified by setting the outer contour of the non-airflow passage structure in the form of a baffle interface.

[0009] Optionally, the step of determining the ventilation system design scheme for the track vehicle based on the air volume-pressure curves corresponding to each first simulation case includes: comparing the air volume-pressure curves corresponding to each first simulation case with the ideal air volume-pressure curve of the track vehicle, and determining the target first simulation case corresponding to the air volume-pressure curve that is closest to the ideal air volume-pressure curve; and combining the finite element mesh model of the air conditioning unit corresponding to the target first simulation case with the finite element mesh model of the track vehicle to determine the ventilation system design scheme for the track vehicle.

[0010] Optionally, the method further includes: obtaining multiple air conditioning unit geometric models by making various local adjustments to the structure of the air conditioning unit; obtaining a corresponding optimized finite element mesh model of the air conditioning unit by performing finite element analysis on each air conditioning unit geometric model; adding a target fan corresponding to the target first simulation case to each optimized finite element mesh model of the air conditioning unit; combining the optimized finite element mesh models of each air conditioning unit with the target fan added with the finite element mesh model of the track vehicle corresponding to the target first simulation case to obtain multiple second simulation cases; and determining a first ventilation system optimization scheme for the track vehicle based on the air volume-pressure curves corresponding to each second simulation case.

[0011] Optionally, the method further includes: obtaining multiple track vehicle geometric models by making various local adjustments to the structure of the track vehicle; determining, for each track vehicle geometric model, to perform finite element analysis on the track vehicle geometric model to obtain a corresponding optimized finite element mesh model of the track vehicle; adding the flow-pressure curve corresponding to the target first simulation case to each optimized finite element mesh model of the track vehicle; combining each optimized finite element mesh model of the track vehicle with the added flow-pressure curve with the optimized finite element mesh model of the air conditioning unit corresponding to the target first simulation case to obtain multiple third simulation cases; and determining a first ventilation system optimization scheme for the track vehicle based on the air volume-pressure curve corresponding to each third simulation case.

[0012] Optionally, the finite element mesh model of the track carrier includes: passenger compartment finite element, air conditioning unit finite element, air duct finite element and cavity finite element.

[0013] Secondly, this application embodiment also provides a simulation analysis device for a ventilation system of a rail vehicle. The device includes: an air conditioning unit finite element mesh model determination module, used to determine the air conditioning unit finite element mesh model, in which the air conditioning unit fan is constructed;

[0014] The flow-pressure curve determination module is used to determine the flow-pressure curve corresponding to each type of fan in the finite element mesh model of the air conditioning unit for each type of fan.

[0015] The track vehicle finite element mesh model determination module is used to determine various track vehicle finite element mesh models.

[0016] The first simulation case determination module is used to combine the finite element mesh models of air conditioning units with different types of fans with the finite element mesh models of various track loads to obtain multiple first simulation cases.

[0017] The airflow-pressure curve determination module is used to obtain the airflow-pressure curve generated inside the track vehicle when the corresponding fan acts on the finite element mesh model of the track vehicle corresponding to the first simulation case, based on the flow-pressure curve of the fan corresponding to the first simulation case for each first simulation case.

[0018] The ventilation system design scheme determination module is used to determine the ventilation system design scheme for the track vehicle based on the air volume-pressure curves corresponding to each first simulation example.

[0019] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the simulation analysis method for the ventilation system of a track vehicle as described above are performed.

[0020] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, performs the steps of the simulation analysis method for a ventilation system of a rail vehicle as described above.

[0021] The simulation analysis method and apparatus for ventilation systems of rail vehicles provided in this application can obtain the optimal ventilation system design scheme by combining and simulating the air conditioning unit, fan, and rail vehicle. This solves the problem that the ventilation system in the prior art has failed to achieve good matching and optimization design, and achieves the effect of determining the optimal design scheme of the ventilation system.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart illustrating a simulation analysis method for a ventilation system of a rail vehicle provided in an embodiment of this application;

[0025] Figure 2 A schematic diagram of a track vehicle provided in an embodiment of this application;

[0026] Figure 3 A schematic diagram of the structure of a simulation analysis device for a ventilation system of a rail vehicle provided in an embodiment of this application;

[0027] Figure 4 This application provides a schematic diagram of the structure of an electronic device. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0029] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of ventilation technology for rail vehicles.

[0030] Research has shown that with the development of subway vehicles, users have placed higher demands on the comfort of the environment inside the carriages. In order to create a comfortable passenger environment, the air conditioning system should be able to achieve good airflow organization while meeting user needs such as low noise and low energy consumption.

[0031] Currently, during the vehicle prototype testing phase, issues frequently arise where indicators such as airflow and positive pressure inside the vehicle fail to meet requirements. This is because the ventilation system has not achieved proper matching and optimized design, and it is difficult to make corrections in actual vehicles.

[0032] Based on this, the present application provides a simulation analysis method and apparatus for a ventilation system for a rail vehicle. It can obtain the optimal ventilation system design scheme by combining and simulating the air conditioning unit, fan, and rail vehicle, thus solving the problem that the ventilation system in the prior art has failed to achieve good matching and optimization design, and achieving the effect of determining the optimal design scheme of the ventilation system.

[0033] Please see Figure 1 , Figure 1 This is a flowchart illustrating a simulation analysis method for a ventilation system of a rail vehicle, provided as an embodiment of this application. Figure 1 As shown in the embodiments of this application, the simulation analysis method for a ventilation system of a rail vehicle includes:

[0034] S101. Determine the finite element mesh model of the air conditioning unit, and construct the fan of the air conditioning unit in the finite element mesh model of the air conditioning unit.

[0035] This yields the finite element mesh model of the air conditioning unit with the fan.

[0036] S102. For each type of fan, determine the flow-pressure curve corresponding to that type of fan under the finite element mesh model of the air conditioning unit.

[0037] The flow-pressure curves of the finite element network model for each type of fan-air conditioning unit can be determined as follows: Based on the construction of the finite element mesh model of the air conditioning unit, determine the overall internal resistance and fresh air inlet resistance of the air conditioning unit; set a resistance surface in the finite element mesh model of the air conditioning unit to equivalently represent the overall internal resistance and fresh air inlet resistance of the air conditioning unit based on the set resistance surface; determine the flow-pressure curves corresponding to each type of fan based on the flow-pressure curves corresponding to each type of fan and the finite element mesh model of the air conditioning unit with the resistance surface set.

[0038] Specifically, the flow-pressure curve corresponding to this type of fan under the finite element mesh model of the air conditioning unit can be determined in the following way: determine the flow-pressure curve of the finite element network model of the air conditioning unit; obtain multiple output flow values ​​of this type of fan under the flow-pressure curve of the finite element mesh model of the air conditioning unit and the pressure values ​​inside the fan corresponding to each output flow value; fit the multiple output flow values ​​and multiple pressure values ​​to obtain the flow-pressure curve corresponding to this type of fan.

[0039] Here, the resistance inside the air conditioning unit includes the overall internal resistance of the air conditioning unit and the resistance of the fresh air inlet. This resistance cannot be simulated in the finite element mesh model. However, ignoring the overall internal resistance and the resistance of the fresh air inlet of the air conditioning unit will have a significant impact on the simulation of the air conditioning unit. Therefore, this application sets up a resistance surface at the air outlet of the air conditioning unit to represent the overall internal resistance and the resistance of the fresh air inlet of the air conditioning unit, so as to ensure that the simulation effect is closer to the real situation.

[0040] For example, based on CFD (Computational Fluid Dynamics) software, the flow-pressure curve corresponding to each type of fan can be determined according to the flow-pressure curve corresponding to each type of fan and the finite element mesh model of the air conditioning unit with a resistance surface set. For instance, different flow-pressure curves can be input into the finite element mesh model of the air conditioning unit with a resistance surface set, and the flow-pressure curve that the air conditioning unit can output under different fans can be obtained through CFD software simulation calculation.

[0041] S103. Determine the finite element mesh models of various track vehicles.

[0042] For example, the rail vehicle could be a subway car, etc.

[0043] The following methods can be used to determine various finite element mesh models of the track vehicle: Obtain various geometric models of the track vehicle; for each geometric model, perform the following steps: using the inner surface of the geometric model as a reference, retain the airflow path structure in the geometric model, simplify the non-airflow path structure in the geometric model to obtain the optimized model corresponding to the geometric model, perform finite element analysis on the optimized model to obtain the finite element mesh model of the track vehicle corresponding to the geometric model. Here, the airflow path structure is the structure in the geometric model that affects airflow, and the non-airflow path structure is simplified by setting the outer contour of the non-airflow path structure as a baffle interface.

[0044] For example, airflow pathway structures include passenger compartments, cavities, etc., while non-airflow pathway structures include cable trays, wiring harnesses, electrical components, etc.

[0045] Optionally, the finite element mesh model of the track carrier includes: passenger compartment finite element, air conditioning unit finite element, air duct finite element and cavity finite element.

[0046] For details, please refer to Figure 2 , Figure 2 This is a schematic diagram of a track vehicle provided in an embodiment of this application. Figure 2 As shown in the embodiment, a track vehicle includes: a passenger compartment 3, an air conditioning unit 1, an air duct 2, and a cavity 4.

[0047] Please see Figure 2 The air conditioning unit 1 is located above the track vehicle and ventilates the passenger compartment 3 and cavity 4 through the air duct 2.

[0048] S104. Combine the finite element mesh models of air conditioning units with different types of fans with the finite element mesh models of various track loads to obtain multiple first simulation examples;

[0049] Here, each first simulation example includes a finite element mesh model of an air conditioning unit with one type of fan and a finite element mesh model of a track vehicle.

[0050] For example, having a finite element mesh model of an air conditioning unit with type A fan and a finite element mesh model of a carrier with type B will result in A times B first simulation examples.

[0051] S105. For each first simulation case, based on the flow-pressure curve of the fan corresponding to the first simulation case, obtain the airflow-pressure curve generated inside the track vehicle by the corresponding fan acting on the finite element mesh model of the track vehicle corresponding to the first simulation case.

[0052] Here, the calculation of the wind turbine acting on the finite element mesh model of the track vehicle corresponding to the first simulation example is performed. The air volume-pressure curve generated inside the track vehicle can be calculated using a single-precision implicit algorithm in the simulation software. The coupling of pressure and velocity is performed using a semi-implicit algorithm of the pressure coupling equation set and a standard pressure discretization scheme. The convection terms of the velocity equations and k and ε equations in the three coordinate directions are discretized using a second-order upwind difference method to calculate the air volume generated inside the track vehicle.

[0053] S106. Based on the air volume-pressure curves corresponding to each first simulation example, determine the ventilation system design scheme for the track vehicle.

[0054] The step of determining the ventilation system design scheme for the track vehicle based on the air volume-pressure curves corresponding to each first simulation case includes: comparing the air volume-pressure curves corresponding to each first simulation case with the ideal air volume-pressure curve of the track vehicle, and determining the target first simulation case corresponding to the air volume-pressure curve that is closest to the ideal air volume-pressure curve; and combining the finite element mesh model of the air conditioning unit corresponding to the target first simulation case with the finite element mesh model of the track vehicle to determine the ventilation system design scheme for the track vehicle.

[0055] In this way, the optimal matching combination with the ideal airflow-pressure curve is determined from a variety of candidate fans and candidate track vehicles. The combination of the finite element mesh model of the air conditioning unit and the finite element mesh model of the track vehicle corresponding to the optimal matching combination is determined as the ventilation system design scheme for the track vehicle.

[0056] Optionally, the method further includes: obtaining multiple air conditioning unit geometric models by making various local adjustments to the structure of the air conditioning unit; obtaining a corresponding optimized finite element mesh model of the air conditioning unit by performing finite element analysis on each air conditioning unit geometric model; adding a target fan corresponding to the target first simulation case to each optimized finite element mesh model of the air conditioning unit; combining the optimized finite element mesh models of each air conditioning unit with the target fan added with the finite element mesh model of the track vehicle corresponding to the target first simulation case to obtain multiple second simulation cases; and determining a first ventilation system optimization scheme for the track vehicle based on the air volume-pressure curves corresponding to each second simulation case.

[0057] Among them, there is at least one local geometric structure that is different between the geometric models of each air conditioning unit.

[0058] Optionally, the method further includes: obtaining multiple track vehicle geometric models by making various local adjustments to the structure of the track vehicle; determining, for each track vehicle geometric model, to perform finite element analysis on the track vehicle geometric model to obtain a corresponding optimized finite element mesh model of the track vehicle; adding the flow-pressure curve corresponding to the target first simulation case to each optimized finite element mesh model of the track vehicle; combining each optimized finite element mesh model of the track vehicle with the added flow-pressure curve with the optimized finite element mesh model of the air conditioning unit corresponding to the target first simulation case to obtain multiple third simulation cases; and determining a first ventilation system optimization scheme for the track vehicle based on the air volume-pressure curve corresponding to each third simulation case.

[0059] Among them, there is at least one local geometry that is different between the geometric models of each orbital vehicle.

[0060] The simulation analysis method for ventilation systems for rail vehicles provided in this application can obtain the optimal ventilation system design scheme by combining and simulating the air conditioning unit, fan, and rail vehicle. This solves the problem that the ventilation system in the prior art has failed to achieve good matching and optimization design, and achieves the effect of determining the optimal design scheme of the ventilation system.

[0061] Based on the same inventive concept, this application also provides a simulation analysis device for a ventilation system of a track vehicle, which corresponds to the simulation analysis method for a ventilation system of a track vehicle. Since the principle of the device in this application is similar to the simulation analysis method for a ventilation system of a track vehicle described above, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0062] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a simulation analysis device for a ventilation system of a rail vehicle, provided as an embodiment of this application. Figure 3 As shown, the simulation analysis device 300 for the ventilation system of a track vehicle includes:

[0063] The air conditioning unit finite element mesh model determination module 301 is used to determine the air conditioning unit finite element mesh model, and the air conditioning unit fan is constructed in the air conditioning unit finite element mesh model;

[0064] The flow-pressure curve determination module 302 is used to determine the flow-pressure curve corresponding to each type of fan in the finite element mesh model of the air conditioning unit for each type of fan.

[0065] The track vehicle finite element mesh model determination module 303 is used to determine various track vehicle finite element mesh models;

[0066] The first simulation case determination module 304 is used to combine the finite element mesh model of the air conditioning unit with different types of fans with the finite element mesh model of various track loads to obtain multiple first simulation cases.

[0067] The airflow-pressure curve determination module 305 is used to obtain, for each first simulation case, the airflow-pressure curve generated by the corresponding fan acting on the finite element mesh model of the track vehicle corresponding to the first simulation case inside the track vehicle based on the flow-pressure curve of the fan corresponding to the first simulation case.

[0068] The ventilation system design scheme determination module 306 is used to determine the ventilation system design scheme for the track vehicle based on the air volume-pressure curves corresponding to each first simulation example.

[0069] The simulation analysis device for ventilation systems of rail vehicles provided in this application embodiment can obtain the optimal ventilation system design scheme by combining and simulating the air conditioning unit, fan, and rail vehicle. This solves the problem that the ventilation system in the prior art has failed to achieve good matching and optimization design, and achieves the effect of determining the optimal design scheme of the ventilation system.

[0070] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0071] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, they can perform the operations described above. Figure 1 The steps of the simulation analysis method for the ventilation system of a rail vehicle in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0072] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 1 The steps of the simulation analysis method for the ventilation system of the track vehicle in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0073] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0074] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0076] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0077] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A simulation analysis method for a ventilation system of a rail vehicle, characterized in that, The method includes: A finite element mesh model of the air conditioning unit was determined, and the fan of the air conditioning unit was constructed in the finite element mesh model of the air conditioning unit. For each type of fan, determine the flow-pressure curve corresponding to that type of fan under the finite element mesh model of the air conditioning unit; Multiple finite element mesh models of the track vehicle are determined. These models are determined as follows: multiple geometric models of the track vehicle are obtained; for each geometric model, the following steps are performed: using the inner surface of the geometric model as a reference, the airflow pathway structure is retained, and the non-airflow pathway structure is simplified to obtain an optimized model corresponding to the geometric model. Finite element analysis is then performed on the optimized model to obtain the corresponding finite element mesh model of the track vehicle. The airflow pathway structure refers to the structure in the geometric model that affects airflow, and the non-airflow pathway structure is simplified by setting its outline as a baffle interface. The finite element mesh models of air conditioning units with different types of fans are combined with the finite element mesh models of various track loads to obtain multiple first simulation examples; For each first simulation case, based on the flow-pressure curve of the fan corresponding to the first simulation case, the airflow-pressure curve generated by the corresponding fan acting on the finite element mesh model of the track vehicle corresponding to the first simulation case inside the track vehicle is obtained; Based on the airflow-pressure curves corresponding to each of the first simulation examples, the design scheme of the ventilation system for the track vehicle is determined.

2. The method according to claim 1, characterized in that, The flow-pressure curve corresponding to this type of fan in the finite element mesh model of the air conditioning unit was determined using the following method: Determine the flow-pressure curve of the finite element network model of the air conditioning unit; Obtain multiple output flow values ​​of this type of fan under the flow-pressure curve of the finite element mesh model of the air conditioning unit, as well as the pressure values ​​inside the fan corresponding to each output flow value; By fitting multiple output flow rates and multiple pressure values, the flow-pressure curve corresponding to this type of fan is obtained.

3. The method according to claim 2, characterized in that, The flow-pressure curves for each type of fan in the finite element network model of the air conditioning unit were determined using the following method: Based on the construction of the finite element mesh model of the air conditioning unit, the overall internal resistance and the resistance of the fresh air inlet of the air conditioning unit are determined. A resistance surface is set in the finite element mesh model of the air conditioning unit to represent the overall internal resistance and fresh air inlet resistance of the air conditioning unit based on the set resistance surface. Obtain multiple wind speed values ​​from the finite element mesh model of the air conditioning unit and the corresponding resistance values ​​of the finite element mesh model of the air conditioning unit for each wind speed value; By fitting multiple wind speed values ​​and multiple resistance values, the flow-pressure curves of the finite element mesh model of the air conditioning unit are obtained.

4. The method according to claim 1, characterized in that, Based on the airflow-pressure curves corresponding to each of the first simulation examples, the steps for determining the ventilation system design scheme for the track vehicle include: The air volume-pressure curves corresponding to each first simulation case are compared with the ideal air volume-pressure curve of the track vehicle to determine the target first simulation case corresponding to the air volume-pressure curve that is closest to the ideal air volume-pressure curve. The combination of the finite element mesh model of the air conditioning unit corresponding to the first simulation example of the target and the finite element mesh model of the track vehicle is determined as the design scheme of the ventilation system for the track vehicle.

5. The method according to claim 4, characterized in that, The method further includes: By making various local adjustments to the structure of the air conditioning unit, multiple geometric models of the air conditioning unit were obtained; For each air conditioning unit's geometric model, finite element analysis is performed on the air conditioning unit's geometric model to obtain the corresponding optimized finite element mesh model of the air conditioning unit; Add the target fan corresponding to the first simulation case to the optimized finite element mesh model of each air conditioning unit; The optimized finite element mesh models of each air conditioning unit with the target fan added are combined with the finite element mesh models of the track load corresponding to the first simulation case of the target to obtain multiple second simulation cases; Based on the air volume-pressure curves corresponding to each second simulation example, an optimization scheme for the first ventilation system of the track vehicle is determined.

6. The method according to claim 4, characterized in that, The method further includes: By making various local adjustments to the structure of the track vehicle, multiple track vehicle geometric models are obtained; For each orbital vehicle geometric model, a finite element analysis is performed on the orbital vehicle geometric model to obtain the corresponding optimized finite element mesh model of the orbital vehicle. Add the airflow-pressure curve corresponding to the first simulation case of the target to each optimized finite element mesh model of the orbital vehicle; The optimized finite element mesh models of each track vehicle with added air volume-pressure curves are combined with the optimized finite element mesh models of the air conditioning units corresponding to the first target simulation case to obtain multiple third simulation cases. Based on the air volume-pressure curves corresponding to each of the third simulation examples, an optimization scheme for the first ventilation system of the track vehicle is determined.

7. The method according to claim 1, characterized in that, The finite element mesh model of the track carrier includes: passenger compartment finite element, air conditioning unit finite element, air duct finite element and cavity finite element.

8. A simulation analysis device for a ventilation system of a rail vehicle, characterized in that, The device includes: The air conditioning unit finite element mesh model determination module is used to determine the air conditioning unit finite element mesh model, and the air conditioning unit fan is constructed in the air conditioning unit finite element mesh model; The flow-pressure curve determination module is used to determine the flow-pressure curve corresponding to each type of fan in the finite element mesh model of the air conditioning unit for each type of fan. A finite element mesh model determination module for track vehicles is used to determine various finite element mesh models of track vehicles. This module determines the various finite element mesh models of track vehicles through the following methods: obtaining various geometric models of the track vehicle; for each geometric model, performing the following steps: using the inner surface of the geometric model as a reference, retaining the airflow passage structure in the geometric model, simplifying the non-airflow passage structure in the geometric model to obtain the corresponding optimized model; performing finite element analysis on the optimized model to obtain the corresponding finite element mesh model of the track vehicle. The airflow passage structure refers to the structure in the geometric model that affects airflow, and the non-airflow passage structure is simplified by setting its outer contour as a baffle interface. The first simulation case determination module is used to combine the finite element mesh models of air conditioning units with different types of fans with the finite element mesh models of various track loads to obtain multiple first simulation cases. The airflow-pressure curve determination module is used to obtain the airflow-pressure curve generated inside the track vehicle when the corresponding fan acts on the finite element mesh model of the track vehicle corresponding to the first simulation case, based on the flow-pressure curve of the fan corresponding to the first simulation case for each first simulation case. The ventilation system design scheme determination module is used to determine the ventilation system design scheme for the track vehicle based on the air volume-pressure curves corresponding to each first simulation example.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is in operation, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of the method as described in any one of claims 1 to 7.

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