Design method, device, equipment and storage medium for rail vehicle body structure

Abstract

The present invention discloses a design method, device, equipment and storage medium for a rail vehicle body structure, which belongs to the field of rail vehicles and is used to design the body structure of a rail vehicle. Considering that the cross-sectional configuration of the profile body of a rail vehicle is most sensitive to airtight load conditions, and the cross-sectional configuration of the profile body under airtight load conditions also conforms to the plane strain assumption, the cross-sectional topology analysis of a rail vehicle body of a shorter length can also achieve the same analysis effect. It is precisely because the analyzed body length is reduced that a smaller finite element grid size can be set to carry out a more refined finite element analysis of the profile body section, thereby obtaining a more accurate and reliable profile body cross-sectional topology, followed by shape and size optimization, to obtain an engineering solution for the profile body cross-sectional topology, further improving reliability, and because the present application is applied to a processor, the degree of automation and work efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of rail vehicles, and in particular to a design method for a rail vehicle body structure. The present invention also relates to a design device, equipment and computer-readable storage medium for a rail vehicle body structure. Background Art

[0002] As modern rail transit vehicles tend to have more complex functional requirements and extreme service conditions, the lightweight design of profile body structures poses a more severe technical challenge. The design methods of traditional rail vehicle profile body structures usually rely heavily on the designer's own experience, and often fail to meet engineering design requirements in terms of design efficiency and lightweight performance.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Summary of the invention

[0004] An object of the present invention is to provide a design method for a rail vehicle body structure, which can obtain a lightweight and reliable profile body cross-sectional topology, and improve the degree of automation and work efficiency; another object of the present invention is to provide a design device, equipment and computer-readable storage medium for a rail vehicle body structure, which can obtain a lightweight and reliable profile body cross-sectional topology, and improve the degree of automation and work efficiency.

[0005] In order to solve the above technical problems, the present invention provides a design method for a rail vehicle body structure, which is applied to a processor and comprises:

[0006] Based on the finite element mesh size of the specified value, the finite element analysis method is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition, so as to obtain the conceptual design of the profile body section topology in combination with the actual manufacturing process limitations of the profile and the profile body section topology;

[0007] Taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution of the profile body section topology;

[0008] Wherein, the specified length is less than the total length of the rail vehicle body.

[0009] Preferably, before the finite element mesh size based on the specified value is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition by using the finite element analysis method, so as to obtain the conceptual design of the profile body section topology in combination with the actual manufacturing process limitation of the profile and the profile body section topology, the design method of the rail vehicle body structure also includes:

[0010] Obtain the profile body structure design space of the rail vehicle to be optimized;

[0011] In the profile body structure design space, taking mass as a constraint and maximizing the body structure stiffness as an optimization goal, the profile body section topology corresponding to each of a plurality of design conditions is calculated;

[0012] Determining the target design condition for which the profile body section configuration of the rail vehicle to be optimized is most sensitive according to the profile body section topologies corresponding to the various design conditions;

[0013] If the target design condition is the airtight load condition, the step of calculating the profile body section topology of a rail vehicle body of a specified length under the airtight load condition based on the finite element mesh size of the specified value using the finite element analysis method is performed.

[0014] Preferably, the step of obtaining the profile body structure design space of the rail vehicle to be optimized is as follows:

[0015] According to the body limits, interior space contours, various interface relationships and space occupied by components of the rail vehicle to be optimized, the profile body structure design space of the rail vehicle to be optimized is determined.

[0016] Preferably, the optimization objective is to minimize the model mass, and the preset performance index is used as a constraint condition to optimize the shape and size of the conceptual design of the profile body section topology, so as to obtain the engineering solution of the profile body section topology, which is specifically:

[0017] Performing vehicle-level vehicle body structure numerical simulation analysis under multiple design conditions for a designated benchmark vehicle body structure to determine a structural stiffness performance index of the designated benchmark vehicle body structure;

[0018] Determining the modal frequency performance index of the designated benchmark vehicle body structure through modal analysis;

[0019] Using the structural stiffness performance index and the modal frequency performance index as preset performance indexes;

[0020] Taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution for the profile body section topology.

[0021] Preferably, after the shape and size of the conceptual design of the profile car body cross-section topology are optimized with the minimum model mass as the optimization target and the preset performance index as the constraint condition to obtain the engineering solution of the profile car body cross-section topology, the design method of the rail vehicle car body structure further includes:

[0022] Based on the engineering solution, a full-operating condition numerical simulation analysis of the vehicle-level body structure is carried out in accordance with the specified standard requirements, and it is determined whether the engineering solution meets the specified standard requirements.

[0023] Preferably, after carrying out full-operating condition numerical simulation analysis of the vehicle-level car body structure based on the engineering solution and in accordance with specified standard requirements, and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle car body structure further includes:

[0024] Determining whether the engineering solution meets the specified standard requirements;

[0025] If it meets the requirements, the engineering solution will be trial-produced and tested at the vehicle or component level to determine the final design solution.

[0026] Preferably, after carrying out full-operating condition numerical simulation analysis of the vehicle-level car body structure based on the engineering solution and in accordance with specified standard requirements, and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle car body structure further includes:

[0027] The control prompter prompts the determination result of whether the engineering solution meets the requirements of the specified standard.

[0028] In order to solve the above technical problems, the present invention also provides a design device for a rail vehicle body structure, which is applied to a processor and comprises:

[0029] A calculation module, for calculating the profile body section topology of a rail vehicle body of a specified length under an airtight load condition by using a finite element analysis method based on a finite element mesh size of a specified value, so as to obtain a conceptual design of the profile body section topology in combination with the actual manufacturing process limitations of the profile and the profile body section topology;

[0030] An optimization module, for optimizing the shape and size of the conceptual design of the profile body cross-section topology with the minimum model mass as the optimization target and the preset performance index as the constraint condition, so as to obtain an engineering solution of the profile body cross-section topology;

[0031] Wherein, the specified length is less than the total length of the rail vehicle body.

[0032] In order to solve the above technical problems, the present invention also provides a design device for a rail vehicle body structure, comprising:

[0033] Memory for storing computer programs;

[0034] A processor is used to implement the steps of the above-mentioned method for designing a rail vehicle body structure when executing the computer program.

[0035] In order to solve the above technical problems, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the design method of the rail vehicle body structure as described above are implemented.

[0036] The present invention provides a design method for a rail vehicle body structure. Considering that it has been found through research that the cross-sectional configuration of a rail vehicle body is most sensitive to an airtight load condition, and the cross-sectional configuration of the profile body under the airtight load condition also conforms to the plane strain assumption, the cross-sectional topology analysis of a rail vehicle body of a shorter length can also achieve the same analysis effect. It is precisely because the analyzed body length is reduced that a smaller finite element grid size can be set to carry out a more refined finite element analysis on the profile body cross-section, thereby obtaining a more accurate and reliable profile body cross-sectional topology. Then, with the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body cross-sectional topology is optimized in shape and size, and an engineering solution for the profile body cross-sectional topology is obtained, which further improves reliability. Moreover, since the present application is applied to a processor, the degree of automation and work efficiency are improved.

[0037] The present invention also provides a design device, equipment and computer-readable storage medium for a rail vehicle body structure, which have the same beneficial effects as the design method for the rail vehicle body structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic flow chart of a design method for a rail vehicle body structure provided by the present invention;

[0040] Figure 2 It is a schematic diagram of the cross-sectional configuration of the aluminum alloy profile body under airtight load conditions;

[0041] Figure 3 This is a schematic diagram of the topological concept design of the aluminum alloy body section;

[0042] Figure 4 This is a schematic diagram of the design space for a typical aluminum alloy body;

[0043] Figure 5 It is a schematic diagram of the cross-sectional configuration of the aluminum alloy profile body under typical design conditions;

[0044] Figure 6 A schematic structural diagram of a design device for a rail vehicle body structure provided by the present invention;

[0045] Figure 7 A schematic structural diagram of a rail vehicle body structure design device provided by the present invention. DETAILED DESCRIPTION

[0046] The core of the present invention is to provide a design method for a rail vehicle body structure, which can obtain a lightweight and reliable profile body cross-sectional topology, and improve the degree of automation and work efficiency; another core of the present invention is to provide a design device, equipment and computer-readable storage medium for a rail vehicle body structure, which can obtain a lightweight and reliable profile body cross-sectional topology, and improve the degree of automation and work efficiency.

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please refer to Figure 1 , Figure 1 A schematic flow chart of a design method for a rail vehicle body structure provided by the present invention, wherein the design method for a rail vehicle body structure is applied to a processor, comprising:

[0049] S101: Based on the finite element mesh size of the specified value, the finite element analysis method is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition, so as to obtain the conceptual design of the profile body section topology by combining the actual manufacturing process limitations of the profile and the profile body section topology;

[0050] Specifically, based on the above background technology, as modern rail transit vehicles tend to have more complex functional requirements and extreme service conditions, the lightweight design of the vehicle structure poses a more severe technical challenge. The "trial and error" iterative means of traditional simulation verification and design optimization methods such as multi-scheme comparison and size optimization are heavily dependent on the designer's own experience, and often cannot obtain the optimal solution. In addition, it is difficult to meet engineering design requirements in terms of design efficiency and lightweight performance.

[0051] Among them, topology optimization technology can design innovative configurations that are difficult to obtain with traditional concepts because it does not rely on the experience of engineers and designers. It combines new materials and new processes to maximize structural lightweighting and is widely used in high-end equipment such as aerospace and automobiles. It has been integrated into its product development process, namely the simulation-driven design method, with significant weight reduction and performance improvement effects. At present, there is a clear lack of research on topology optimization design technology for vehicle-level body structures, especially aluminum alloy profile bodies, at home and abroad.

[0052] To better illustrate the embodiments of the present invention, please refer to Figure 2 , Figure 2 It is a schematic diagram of the cross-sectional configuration of the aluminum alloy profile body under airtight load conditions, which can reflect the internal reinforcement configuration of the profile.

[0053] Specifically, taking into account the technical problems in the above background technology, and considering that it has been found through research that the cross-sectional configuration of the profile body of a rail vehicle is most sensitive to airtight load conditions, and the cross-sectional configuration of the profile body under airtight load conditions also conforms to the plane strain assumption, therefore, the cross-sectional topology analysis of a rail vehicle body of a shorter length can also achieve the same analysis effect. It is precisely because finite element analysis can be performed on a body of a shorter length, which greatly reduces the amount of calculation. Therefore, a smaller finite element grid size can be set under this favorable condition to carry out a more refined finite element analysis of the profile body cross-section, thereby obtaining a more accurate and reliable profile body cross-sectional topology. Therefore, in an embodiment of the present invention, based on a finite element grid size of a specified value, the finite element analysis method can be used to calculate the cross-sectional topology of the profile body of a rail vehicle of a specified length under airtight load conditions, so as to obtain a conceptual design of the profile body cross-sectional topology in combination with the actual manufacturing process limitations of the profile and the cross-sectional topology of the profile body.

[0054] Among them, both the specified value and the specified length can be set independently. The specified length can be set very small, and the specified value can also be set as small as possible, so as to maximize the accuracy of the profile body section topology.

[0055] The actual manufacturing process limitations of profiles may include multiple items, such as cavity size and extrusion equipment capacity. In addition, the conceptual design may also refer to the design requirements of doors and windows / air conditioners / pantograph interfaces.

[0056] S102: Taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution for the profile body section topology;

[0057] Wherein, the specified length is less than the overall length of the rail vehicle body.

[0058] To better illustrate the embodiments of the present invention, please refer to Figure 3 , Figure 3 Schematic diagram of the conceptual design of the aluminum alloy profile body cross-section topology.

[0059] Specifically, after having the conceptual design of the profile body section topology, since the conceptual design of the profile body section topology at this time is still relatively rough and does not have the conditions for direct engineering application, it is necessary to further optimize it using shape optimization and size optimization techniques. The optimization constraints are the preset performance indicators, and the optimization goal is to minimize the model mass. Through this optimization, an engineering solution for a lightweight and high-performance profile body section topology can be obtained.

[0060] Specifically, the design variables of the shape and size involved in the optimization may be multiple, for example, may include the inner rib angle, profile thickness, wall thickness, etc., which are not limited in the embodiment of the present invention.

[0061] It is worth mentioning that the material of the profile body in the embodiment of the present invention can be various, for example, the profile body can be made of aluminum alloy, etc., and the embodiment of the present invention is not limited here.

[0062] Among them, after the above optimization, it is expected that under the condition of 10% weight reduction, various performance optimization indicators will be improved to varying degrees, especially the first-order diamond mode frequency will be increased by more than 1Hz.

[0063] The present invention provides a design method for a rail vehicle body structure. Considering that it has been found through research that the cross-sectional configuration of a rail vehicle body is most sensitive to an airtight load condition, and the cross-sectional configuration of the profile body under the airtight load condition also conforms to the plane strain assumption, the cross-sectional topology analysis of a rail vehicle body of a shorter length can also achieve the same analysis effect. It is precisely because the analyzed body length is reduced that a smaller finite element grid size can be set to carry out a more refined finite element analysis on the profile body cross-section, thereby obtaining a more accurate and reliable profile body cross-sectional topology. Then, with the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body cross-sectional topology is optimized in shape and size, and an engineering solution for the profile body cross-sectional topology is obtained, which further improves reliability. Moreover, since the present application is applied to a processor, the degree of automation and work efficiency are improved.

[0064] Based on the above embodiments:

[0065] As a preferred embodiment, based on the finite element mesh size of the specified value, the finite element analysis method is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition, so as to obtain the conceptual design of the profile body section topology by combining the actual manufacturing process limitation of the profile and the profile body section topology. The design method of the rail vehicle body structure also includes:

[0066] Obtain the profile body structure design space of the rail vehicle to be optimized;

[0067] In the design space of the profile body structure, with mass as a constraint and the maximum body structure stiffness as the optimization goal, the profile body section topology corresponding to various design conditions is calculated;

[0068] According to the profile car body section topology corresponding to various design conditions, the target design condition for which the profile car body section configuration of the rail vehicle to be optimized is most sensitive is determined;

[0069] If the target design condition is an airtight load condition, a step is performed in which a finite element mesh size is specified based on a specified value, and a finite element analysis method is used to calculate a profile body section topology of a rail vehicle body of a specified length under the airtight load condition.

[0070] To better illustrate the embodiments of the present invention, please refer to Figure 5 , Figure 5 It is a schematic diagram of the cross-sectional configuration of an aluminum alloy profile body under a typical design condition. Specifically, considering that the design space is a prerequisite for topological optimization, the embodiment of the present invention first obtains the design space of the profile body structure of the rail vehicle to be optimized. Then, in order to verify whether the design condition most sensitive to the profile body is an airtight load condition, the embodiment of the present invention can calculate the profile body cross-sectional topology corresponding to a plurality of design conditions within the profile body structure design space, with mass as a constraint and maximum body structure stiffness as an optimization target, and then determine the target design condition to which the profile body cross-sectional configuration of the rail vehicle to be optimized is most sensitive, thereby completing the determination of whether the target design condition most sensitive to the profile body cross-sectional configuration is an airtight load condition. Only when the verification is passed, the finite element mesh size based on the specified value will be continued to be executed, and the finite element analysis method will be used to calculate the profile body cross-sectional topology of the rail vehicle body of a specified length under the airtight load condition.

[0071] Specifically, the embodiment of the present invention can further prove the rationality of "calculating the profile body cross-sectional topology of a rail vehicle body of a specified length under an airtight load condition based on a finite element grid size of a specified value using the finite element analysis method" by verifying whether "the target design condition to which the profile body cross-sectional configuration is most sensitive is an airtight load condition", and can obtain a lightweight and high-performance profile body cross-sectional topology.

[0072] Specifically, the target design condition for which the profile body section configuration of the rail vehicle to be optimized is most sensitive is determined according to the profile body section topologies corresponding to the various design conditions. Specifically, the control prompter prompts the profile body section topologies corresponding to the various design conditions, and then determines the target design condition for which the profile body section configuration of the rail vehicle to be optimized is most sensitive according to the selection designation received from the human-computer interaction device. Figure 5 Table 1 is a schematic diagram of the cross-sectional configuration of the aluminum alloy profile under typical design conditions. It can be seen from the figure that the cross-sectional configuration of the body is most sensitive to the airtight load condition, and the profile inner reinforcement covers the most comprehensive area. Other conditions are only sensitive to the local profile configuration. Therefore, based on the cross-sectional configuration under the airtight load condition, the fusion design of the local profile configuration under other conditions can be achieved through shape and size optimization.

[0073] Of course, in addition to this specific determination method, the most sensitive target design working condition of the profile body section configuration of the rail vehicle to be optimized may also be determined by other methods, which are not limited in the embodiment of the present invention.

[0074] Specifically, in the embodiment of the present invention, within the profile body structure design space, with mass as a constraint and maximum body structure stiffness as an optimization goal, when calculating the profile body cross-section topology corresponding to a variety of design conditions, an 8-node hexahedron can be used to construct a body topology finite element model, and at the same time, topology optimization design variables, profile extrusion manufacturing constraints and material properties are set, wherein the grid size of the profile design area (side walls, roof and floor, etc.) should not be higher than 10 mm.

[0075] Specifically, the design conditions involved in "within the design space of the profile body structure, taking the mass as a constraint and maximizing the body structure stiffness as the optimization goal, calculating the profile body section topology corresponding to each of the various design conditions" can be found in Table 1 below. Table 1 is a list of core topology design conditions for the body structure. Table 1 gives the core topology design conditions for the aluminum alloy body structure of type P-II vehicles in the GB / T 33194 standard. The definitions of the mass symbols (m1, m2, m3, m4) quoted in the load descriptions in Table 1 are the same as those in the GB / T 33194 standard and will not be repeated here.

[0076] Table 1

[0077]

[0078] Among them, mass constraints can generally be achieved by setting the volume / mass fraction in the model; in view of the differences in design conditions and topology optimization parameter settings, the body section topology configuration is not unique. Table 2 gives the topology optimization parameter self-sensitivity analysis to eliminate the unreliability of the section topology configuration caused by the differences in the corresponding parameter settings. While analyzing the sensitivity of the design conditions to the profile body section configuration, the topology optimization parameter self-sensitivity analysis given in Table 2 can be carried out. Table 2 is a description table of the body structure topology optimization parameter self-sensitivity analysis.

[0079] Table 2

[0080]

[0081] As a preferred embodiment, obtaining the profile body structure design space of the rail vehicle to be optimized is specifically as follows:

[0082] The design space of the profile body structure of the rail vehicle to be optimized is determined based on the body limits, interior space contours, various interface relationships and space occupied by components of the rail vehicle to be optimized.

[0083] To better illustrate the embodiments of the present invention, please refer to Figure 4 , Figure 4 This is a schematic diagram of the design space for a typical aluminum alloy body.

[0084] Specifically, the design space is the premise of topological optimization. For aluminum alloy profile bodies, the design space is determined by the body limits and the contour of the interior space. At the same time, the reduction of various interface relationships or the space occupied by components must be considered, including but not limited to the following:

[0085] a) The space occupied by the bogie, undercarriage equipment, car-end coupler and car-end shock absorber in the car body underframe area;

[0086] b) The air conditioner and pantograph occupy space in the roof area of ​​the vehicle body;

[0087] c) The space occupied by the door and window system in the vehicle side wall area;

[0088] d) The space occupied by the through passage in the end wall area of ​​the vehicle body;

[0089] e) For high-speed EMUs, changes to the body contour due to aerodynamic performance requirements must also be considered;

[0090] f) For vehicles with crashworthiness design requirements, the impact of the energy absorption system on the structural space at the ends of the vehicle body must also be considered.

[0091] Of course, in addition to this method, the profile body structure design space of the rail vehicle to be optimized may also be obtained in other specific ways, which are not limited in the embodiment of the present invention.

[0092] As a preferred embodiment, the shape and size of the conceptual design of the profile body section topology are optimized with the minimum model mass as the optimization goal and the preset performance index as the constraint condition, so as to obtain the engineering solution of the profile body section topology. Specifically,

[0093] Carry out vehicle-level vehicle body structure numerical simulation analysis under multiple design conditions for the specified benchmark vehicle body structure to determine the structural stiffness performance index of the specified benchmark vehicle body structure;

[0094] Determine the modal frequency performance index of the specified benchmark vehicle structure through modal analysis;

[0095] The structural stiffness performance index and the modal frequency performance index are used as preset performance indexes;

[0096] Taking the minimum model mass as the optimization goal and the preset performance indicators as the constraints, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution for the profile body section topology.

[0097] Specifically, in the embodiment of the present invention, a benchmark body structure and a benchmark working condition calculation analysis can be carried out to determine the performance optimization index: for the topologically designed aluminum alloy profile body, a benchmark body structure should be selected, and the vehicle-level body structure numerical simulation analysis can be carried out according to the design working conditions listed in Table 1 to extract the key deformation to determine the structural stiffness performance index; at the same time, the body structure itself is modally analyzed to extract the first and second order modal frequency values ​​to determine the modal frequency performance index. For details, please refer to Table 3 below. Table 3 gives the necessary performance index parameters of the aluminum alloy body of the P-II type vehicle in the GB / T 33194 standard. Other models can refer to the listed working conditions for analysis to determine the corresponding parameters.

[0098] Table 3

[0099]

[0100] As a preferred embodiment, taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile car body cross-section topology is optimized in shape and size to obtain an engineering solution of the profile car body cross-section topology, and the design method of the rail vehicle car body structure also includes:

[0101] Based on the engineering solution, carry out full-condition numerical simulation analysis of the vehicle-level body structure in accordance with the specified standard requirements, and determine whether the engineering solution meets the specified standard requirements.

[0102] Specifically, in order to verify whether the engineering solution meets the specified standard requirements, in an embodiment of the present invention, a full-operating condition numerical simulation analysis of the vehicle body structure can be carried out according to the specified standard requirements to determine the reliability of the final engineering solution.

[0103] Among them, the specified standard can be of various types, for example, it can be GB / T 33194 standard or TB / T3548 or TB / T3451 standard, etc., and the embodiment of the present invention is not limited here. Please refer to Table 4, which gives an example of the design working condition of the P-II type vehicle aluminum alloy body structure in the GB / T 33194 standard.

[0104] Table 4

[0105]

[0106] As a preferred embodiment, based on the engineering solution, after carrying out full-operating condition numerical simulation analysis of the vehicle-level vehicle body structure in accordance with the specified standard requirements and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle vehicle body structure further includes:

[0107] Determine whether the engineering solution meets the specified standard requirements;

[0108] If it meets the requirements, the engineering solution will be trial-produced and tested at the vehicle or component level to determine the final design solution.

[0109] Specifically, after the engineering solution is determined, in order to further verify the reliability of the solution, in the embodiment of the present invention, the engineering solution can also be trial-produced and tested at the vehicle or component level to determine the final design solution.

[0110] As a preferred embodiment, based on the engineering solution, after carrying out full-operating condition numerical simulation analysis of the vehicle-level vehicle body structure in accordance with the specified standard requirements and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle vehicle body structure further includes:

[0111] The control prompter indicates whether the engineering solution meets the requirements of the specified standard.

[0112] Specifically, in order to facilitate the staff to promptly know the "determination result of whether the engineering solution meets the specified standard requirements", the embodiment of the present invention can control the prompter to prompt the determination result of whether the engineering solution meets the specified standard requirements, which is conducive to improving work efficiency and user experience.

[0113] Please refer to Figure 6 , Figure 6 A schematic diagram of a design device for a rail vehicle body structure provided by the present invention, wherein the design device for a rail vehicle body structure is applied to a processor and includes:

[0114] A calculation module 61 is used to calculate the profile body section topology of a rail vehicle body of a specified length under an airtight load condition based on a finite element mesh size of a specified value by using a finite element analysis method, so as to obtain a conceptual design of the profile body section topology by combining the actual manufacturing process limitations of the profile and the profile body section topology;

[0115] An optimization module 62 is used to optimize the shape and size of the conceptual design of the profile body section topology with the minimum model mass as the optimization target and the preset performance index as the constraint condition, so as to obtain an engineering solution of the profile body section topology;

[0116] Wherein, the specified length is less than the overall length of the rail vehicle body.

[0117] For an introduction to the design device for the rail vehicle body structure provided by the embodiment of the present invention, please refer to the embodiment of the design method for the rail vehicle body structure described above, and the embodiment of the present invention will not be described in detail here.

[0118] Please refer to Figure 7 , Figure 7 A schematic diagram of a design device for a rail vehicle body structure provided by the present invention, wherein the design device for the rail vehicle body structure comprises:

[0119] A memory 71, used for storing computer programs;

[0120] The processor 72 is used to implement the steps of the design method of the rail vehicle body structure in the above-mentioned embodiment when executing the computer program.

[0121] For an introduction to the design device for the rail vehicle body structure provided by the embodiment of the present invention, please refer to the embodiment of the design method for the rail vehicle body structure described above, and the embodiment of the present invention will not be described in detail here.

[0122] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for designing a rail vehicle body structure in the aforementioned embodiment are implemented.

[0123] For an introduction to the computer-readable storage medium provided in an embodiment of the present invention, please refer to the aforementioned embodiment of the design method for the rail vehicle body structure, and the embodiment of the present invention will not be described in detail here.

[0124] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts refer to the method part description. It should also be noted that in this specification, the term "includes", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0125] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A design method for a rail vehicle body structure, characterized in that: Applicable to processors, including: Based on the finite element mesh size of the specified value, the finite element analysis method is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition, so as to obtain the conceptual design of the profile body section topology in combination with the actual manufacturing process limitations of the profile and the profile body section topology; Taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution of the profile body section topology; Wherein, the specified length is less than the total length of the rail vehicle body.

2. The method for designing a rail vehicle body structure according to claim 1, characterized in that: The finite element grid size based on the specified value is used to calculate the profile body section topology of the rail vehicle body of the specified length under the airtight load condition by the finite element analysis method, so as to obtain the conceptual design of the profile body section topology in combination with the actual manufacturing process limitation of the profile and the profile body section topology, and the design method of the rail vehicle body structure also includes: Obtain the profile body structure design space of the rail vehicle to be optimized; In the design space of the profile body structure, taking mass as a constraint and maximizing the body structure stiffness as an optimization goal, the profile body section topology corresponding to each of the various design conditions is calculated; Determining the target design condition for which the profile body section configuration of the rail vehicle to be optimized is most sensitive according to the profile body section topologies corresponding to the various design conditions; If the target design condition is the airtight load condition, the step of calculating the profile body section topology of a rail vehicle body of a specified length under the airtight load condition based on the finite element mesh size of the specified value using the finite element analysis method is performed.

3. The design method of a rail vehicle body structure according to claim 2, characterized in that: The specific method of obtaining the design space of the profile body structure of the rail vehicle to be optimized is as follows: According to the body limits, interior space contours, various interface relationships and space occupied by components of the rail vehicle to be optimized, the profile body structure design space of the rail vehicle to be optimized is determined.

4. The method for designing a rail vehicle body structure according to claim 3, characterized in that: The optimization goal is to minimize the model mass, and the preset performance index is used as a constraint condition to optimize the shape and size of the conceptual design of the profile body section topology to obtain the engineering solution of the profile body section topology. Specifically, Performing vehicle-level vehicle body structure numerical simulation analysis under multiple design conditions for a designated benchmark vehicle body structure to determine a structural stiffness performance index of the designated benchmark vehicle body structure; Determining the modal frequency performance index of the designated benchmark vehicle body structure through modal analysis; Using the structural stiffness performance index and the modal frequency performance index as preset performance indexes; Taking the minimum model mass as the optimization goal and the preset performance index as the constraint condition, the conceptual design of the profile body section topology is optimized in shape and size to obtain an engineering solution for the profile body section topology.

5. The method for designing a rail vehicle body structure according to any one of claims 1 to 4, characterized in that: After the shape and size of the conceptual design of the profile car body cross-section topology are optimized with the minimum model mass as the optimization goal and the preset performance index as the constraint condition to obtain the engineering solution of the profile car body cross-section topology, the design method of the rail vehicle car body structure also includes: Based on the engineering solution, a full-operating condition numerical simulation analysis of the vehicle-level body structure is carried out in accordance with the specified standard requirements, and it is determined whether the engineering solution meets the specified standard requirements.

6. The method for designing a rail vehicle body structure according to claim 5, characterized in that: After carrying out full-operating condition numerical simulation analysis of the vehicle-level car body structure based on the engineering solution and in accordance with the specified standard requirements, and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle car body structure further includes: Determining whether the engineering solution meets the specified standard requirements; If it meets the requirements, the engineering solution will be trial-produced and tested at the vehicle or component level to determine the final design solution.

7. The method for designing a rail vehicle body structure according to claim 6, characterized in that: After carrying out full-operating condition numerical simulation analysis of the vehicle-level car body structure based on the engineering solution and in accordance with the specified standard requirements, and determining whether the engineering solution meets the specified standard requirements, the design method of the rail vehicle car body structure further includes: The control prompter prompts the determination result of whether the engineering solution meets the requirements of the specified standard.

8. A design device for a rail vehicle body structure, characterized in that: Applicable to processors, including: A calculation module, for calculating the profile body section topology of a rail vehicle body of a specified length under an airtight load condition by using a finite element analysis method based on a finite element mesh size of a specified value, so as to obtain a conceptual design of the profile body section topology in combination with the actual manufacturing process limitations of the profile and the profile body section topology; An optimization module, for optimizing the shape and size of the conceptual design of the profile body cross-section topology with the minimum model mass as the optimization target and the preset performance index as the constraint condition, so as to obtain an engineering solution of the profile body cross-section topology; Wherein, the specified length is less than the total length of the rail vehicle body.

9. A design device for a railway vehicle body structure, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the method for designing a rail vehicle body structure as claimed in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for designing a rail vehicle body structure as claimed in any one of claims 1 to 7.

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