Simulation method, device, electronic equipment and medium based on meshless finite element

Abstract

The present invention discloses a simulation method, device, electronic device and medium based on meshless finite element, which are applied to an assembly, and the method includes: using separate regions to represent multiple target parts in the assembly to obtain an initial simulation model; performing modal simulation analysis on the initial simulation model to determine the structural vibration characteristics of the assembly, and performing primary optimization on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation; performing a sweep frequency vibration test on the assembly to obtain the load of the assembly under various working conditions, and setting corresponding loads for the model after modal simulation; based on the load, performing random vibration simulation analysis on the model after modal simulation, and based on the simulation results of random vibration, performing secondary optimization on the model after modal simulation to obtain a target model. The simulation method provided by the present application improves the efficiency of the simulation process and shortens the design cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of finite element vibration simulation, and in particular to a simulation method, device, electronic equipment and medium based on meshless finite element. Background Art

[0002] At present, hybrid or pure electric powertrains are the mainstream powertrain configuration trend in passenger cars. The design process of electric drive assemblies usually takes a long time and requires many rounds of design modifications. Due to the large number and variety of parts in electric drive assemblies, the workload required for modeling through conventional finite element simulation is extremely large, and the structures of a large number of parts in the electric drive assembly need to be simplified, which affects the accuracy of the simulation. Therefore, new electric drive simulation and design methods need to be developed in the early stages of design to improve the efficiency of the simulation process, shorten the design cycle, and thus enhance product competitiveness. Summary of the invention

[0003] The embodiments of the present application provide a simulation method, device, electronic device and medium based on a meshless finite element, which uses a meshless method to represent the components in an assembly, and performs modal simulation analysis and random vibration simulation analysis on the assembly, thereby improving the efficiency of the simulation process and shortening the design cycle.

[0004] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0005] A simulation method based on meshless finite element is applied to an assembly, and the method comprises:

[0006] A plurality of target components in the assembly are represented by separate regions, and the performance parameters of the respective target components and the contact relationship between the target components are set to obtain an initial simulation model; a modal simulation analysis is performed on the initial simulation model to determine the structural vibration characteristics of the assembly, and a primary optimization is performed on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation; a corresponding load is set for the model after modal simulation, wherein the load is the load of the assembly under various working conditions obtained by performing a sweep frequency vibration test on the assembly; based on the load, a random vibration simulation analysis is performed on the model after modal simulation, and based on the simulation result of random vibration, a secondary optimization is performed on the model after modal simulation to obtain a target model.

[0007] Preferably, the simulation results based on random vibrations perform secondary optimization on the model after the modal simulation, including: based on the simulation results of random vibrations, obtaining stress distributions at various locations of the model after the modal simulation; based on the stress distributions, obtaining NVH sensitive locations in the model after the modal simulation; and structurally optimizing the NVH sensitive locations.

[0008] Preferably, the NVH sensitive parts in the model after the modal simulation are obtained based on the stress distribution, including: judging whether there is an area in the model after the modal simulation where the stress level exceeds a reliable threshold, and if so, determining that the area is an NVH sensitive part.

[0009] Preferably, the modal simulation analysis of the initial simulation model includes: determining important components from the multiple target components according to design objectives; setting corresponding adaptive solution coefficients according to the complexity of the important components to adjust the calculation accuracy of the modal simulation software for the important components; and performing modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0010] Preferably, the assembly is an electric drive assembly, and the modal simulation analysis of the initial simulation model includes: adjusting the calculation accuracy of the modal simulation software based on the change of local energy density in the electric drive assembly or the absolute error of the boundary conditions between regions; and performing modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0011] Preferably, before obtaining the initial simulation model, the method further includes: adjusting the number of degrees of freedom associated with the plurality of target components according to design requirements for the assembly to obtain the initial simulation model.

[0012] Preferably, after obtaining the model after modal simulation, the method further includes: performing iterative modal simulation analysis on the model after modal simulation until the structural vibration characteristics of each target component meet the design requirements.

[0013] In a second aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0014] A simulation device based on meshless finite element, comprising:

[0015] An initial simulation model determination module is used to represent multiple target components in the assembly using separate regions, and to set performance parameters of each of the multiple target components, as well as contact relationships between the multiple target components, to obtain an initial simulation model;

[0016] A modal simulation analysis module, used to perform modal simulation analysis on the initial simulation model, determine the structural vibration characteristics of the assembly, and perform a first-level correction on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation;

[0017] A load setting module, used to set a corresponding load for the model after the modal simulation, wherein the load is a load of the assembly under various working conditions obtained by performing a frequency sweep vibration test on the assembly;

[0018] The target model determination module is used to perform random vibration simulation analysis on the model after the modal simulation based on the load, and perform a second level correction on the model after the modal simulation based on the simulation result of random vibration to obtain the target model.

[0019] In a third aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0020] An electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods described in the first aspect are implemented.

[0021] In a fourth aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0022] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0023] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0024] The simulation method based on meshless finite element provided in the embodiment of the present invention adopts a method of representing multiple target parts in the assembly with a single region respectively. Compared with mesh finite element simulation, the number of simulation analysis units can be greatly reduced, thereby greatly shortening the time required for modeling. The obtained initial simulation model is subjected to modal simulation analysis to obtain the structural vibration characteristics of each target part in the assembly. Based on the structural vibration characteristics of each target part, the initial simulation model is optimized in a general direction, including: the layout position of each target part, damping coefficient, etc., and then based on the loads under various working conditions obtained by performing a sweep frequency vibration test on the assembly, the model after modal simulation is subjected to random vibration simulation analysis, and the model after modal simulation is further optimized, including: the material properties, mechanical properties, etc. of each target part. Therefore, the present application adopts a meshless finite element analysis method, improves the efficiency of the simulation process, performs modal simulation analysis and random vibration simulation on the assembly, quickly predicts and timely optimizes the potential NVH and reliability problems of the assembly, effectively shortens the design cycle, and thus improves the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A flow chart of a simulation method based on meshless finite element provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a simulation device based on a meshless finite element according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present application provide a simulation method, device, electronic device and medium based on a meshless finite element, which uses a meshless method to represent the components in an assembly, and performs modal simulation analysis and random vibration simulation analysis on the assembly, thereby improving the efficiency of the simulation process and shortening the design cycle.

[0030] The overall idea of ​​the technical solution of the embodiment of the present application is as follows:

[0031] A simulation method based on meshless finite element is applied to an assembly, and the method comprises: using separate regions to represent multiple target components in the assembly, and setting the performance parameters of each of the multiple target components, as well as the contact relationship between the multiple target components, to obtain an initial simulation model; performing modal simulation analysis on the initial simulation model to determine the structural vibration characteristics of the assembly, and performing primary optimization on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation; setting corresponding loads on the model after modal simulation, wherein the loads are loads of the assembly under various working conditions obtained by performing a sweep frequency vibration test on the assembly; based on the loads, performing random vibration simulation analysis on the model after modal simulation, and performing secondary optimization on the model after modal simulation based on the simulation results of random vibration to obtain a target model.

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] In the first aspect, a simulation method based on meshless finite element is provided in an embodiment of the present invention, which is applied to an assembly. Specifically, Figure 1 As shown, the method includes the following steps S101 to S104.

[0034] Step S101: multiple target components in the assembly are represented by separate regions, and the performance parameters of the multiple target components and the contact relationships between the multiple target components are set to obtain an initial simulation model.

[0035] The assembly may be of various structures. The assembly described in the present application may be an assembly used in a vehicle, such as an electric drive assembly or other vehicle powertrain components.

[0036] In the specific implementation process, the multiple target components can be all the components in the assembly, or the components in the assembly that need to be simulated and analyzed. Specifically, before performing the simulation analysis, the components in the geometric model (assembly) that have little impact on the simulation analysis project can be evaluated and then selected to be removed or retained.

[0037] Using a separate region to represent means: by using a single region to represent each target component, the component is represented by the shape of the geometric model itself, and one target component is represented by one region. There is no need to manually divide the grid, and each component is represented by a single region or multiple regions of a common shape, which can greatly reduce the number of simulation analysis units. Therefore, this method can greatly shorten the time required for modeling.

[0038] Assuming that the assembly is an electric drive assembly, first constrain the degrees of freedom according to the fixed form of the electric drive assembly in the actual vehicle. Then, set the performance parameters of multiple target components and the contact relationship between multiple target components. The setting process can specifically include: setting the parameters such as structural damping, material properties, and mechanical performance of multiple target components, assembling each target component, and establishing contact relationships between related target components.

[0039] For the electric drive assembly, the contact relationship between the associated target components may include: a contact pair is used between two target components connected by bolts that can have relative slippage, and a tie-type contact pair (tie contact) is used for contact surfaces with interference fit or no relative slippage.

[0040] In a specific embodiment, before obtaining the initial simulation model, the method may further include: adjusting the number of degrees of freedom associated with each of the plurality of target components according to the design requirements of the assembly to obtain the initial simulation model, that is, adjusting the number of degrees of freedom assigned to the associated geometry according to the adaptive solution control.

[0041] Specifically, this application uses meshless finite element simulation. The degrees of freedom of the simulation model are not point-by-point, but are associated with the geometric model surface, line or dot matrix, that is, the degrees of freedom are directly related to the geometric model, not the nodes. Among them, the association form of the degrees of freedom determines the simulation calculation time. Traditional finite elements are point-by-point associations, and meshless finite element degrees of freedom are directly associated with geometric features, thus greatly reducing the amount of simulation calculations.

[0042] Therefore, the higher the degree of freedom of the geometry, the longer the simulation calculation time and the higher the calculation accuracy; the lower the degree of freedom of the association, the shorter the simulation calculation time. In the actual simulation process, according to the design requirements of the assembly, more degrees of freedom are set for important parts to adjust the accuracy, thereby reasonably arranging the simulation calculation time and improving the simulation efficiency.

[0043] Step S102, performing modal simulation analysis on the initial simulation model to determine the structural vibration characteristics of the assembly, and performing primary optimization on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation.

[0044] In a specific embodiment, a modal simulation analysis is performed on the initial simulation model, which may specifically include: determining important components from multiple target components according to design goals; setting corresponding adaptive solution coefficients according to the complexity of the important components to adjust the calculation accuracy of the modal simulation software for the important components; and performing a modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0045] Specifically, based on design experience, different adaptive solution coefficients can be set for the components that need to be evaluated (such as controllers, reducers, motors, etc.) according to the complexity of the structure to adjust the calculation accuracy of the modal simulation software for each target component. In simple terms, the more complex the component, the higher the calculation accuracy, and the simpler the component, the lower the calculation accuracy, thereby achieving accurate calculation of complex components and saving calculation time.

[0046] In a specific embodiment, taking the assembly as an electric drive assembly, performing modal simulation analysis on the initial simulation model may include: adjusting the calculation accuracy of the modal simulation software based on the change of local energy density in the electric drive assembly or the absolute error of the boundary conditions between regions; and performing modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0047] Specifically, by setting the number of adaptive solution cycles, the form and quantity of equations can be adjusted. This method can be applied to the entire assembly or local components, thereby improving the solution settings of important areas in the assembly and achieving the highest accuracy.

[0048] Among them, the range of calculation accuracy needs to be set differently according to the area under investigation. The accuracy is set lower in places with low risks, and higher in places with high risks, so as to save simulation time.

[0049] The calculation accuracy here can represent the number of solution cycles, that is, the calculation accuracy is determined according to the number of solution cycles. For example, the maximum number of adaptive solution cycles can be 4 to 6 times. The higher the number, the longer the solution time and the higher the accuracy. Of course, the calculation accuracy can also be adjusted manually as needed.

[0050] Optionally, performing modal simulation analysis on the initial simulation model may also include: first improving the calculation accuracy of the modal simulation analysis by increasing the order of the polynomial interpolation function or introducing a special non-polynomial function, and then adjusting the calculation accuracy setting of the modal simulation software based on the change of local energy density in the electric drive assembly or the absolute error of the boundary conditions between regions.

[0051] Specifically, after obtaining the model after modal simulation, it also includes: performing iterative modal simulation analysis on the model after modal simulation until the structural vibration characteristics of each target component meet the design requirements. The design requirements are: according to the peak response modal results of the frequency sweep of each component, adjust each component so that its peak value does not overlap, so as to avoid the mutual influence of vibration between components and cause the NVH characteristics to deteriorate. In other words, according to the design goals and requirements of the product, the simulation analysis items can be determined, and based on the simulation analysis items, the simulation results of the modal can be quickly iterated through simulation analysis to optimize the initial simulation model until the structural vibration characteristics of each target component meet the design requirements.

[0052] The first-level optimization of the initial simulation model can include: adjusting the layout of components such as controllers and DCDC through the simulation results of the overall modal vibration shape and excitation response to obtain the best space utilization and NVH performance. The first-level optimization can also include: optimizing the damping coefficient, material properties, etc. of each target component.

[0053] In simple terms, the results of modal simulation are used to determine whether the inherent characteristics of the first-order mode of each component will resonate due to the excitation of the electric drive or the entire vehicle. If resonance occurs, the component will fail or be damaged during operation. By changing the structure or layout of the component, the structural vibration characteristics of the first-order mode are raised to above the excitation source frequency (with a certain safety factor range) to achieve the design goal. Then, based on the peak response modal results of the frequency sweep of each component, the components are adjusted so that their peak values ​​do not overlap, to avoid mutual influence of vibration between components and cause deterioration of NVH characteristics.

[0054] Step S103 , setting a corresponding load for the model after the modal simulation, wherein the load is a load of the assembly under various working conditions obtained by performing a sweep frequency vibration test on the assembly.

[0055] It should be noted that the swept frequency vibration test refers to sweeping the frequency of an assembly placed on a test bench within a certain frequency range to evaluate the target components in the assembly to verify whether the components are broken or cracked or whether they can work normally.

[0056] The corresponding vibration in the test is used as the input of the simulation and input into the random vibration simulation software as the load. This makes it easier to compare the load in the simulation with the load obtained in the test, so as to simulate the model more accurately.

[0057] Taking the electric drive assembly as an example, in a specific embodiment, corresponding loads are set in the simulation model for the working conditions that occur during the reliability test of the electric drive assembly. For example, the motor controller needs to be loaded with 30m / s2 in the X, Y, and Z directions (the Z direction here is the direction parallel to the vertical direction of the car for products installed in other parts) within the range of 25-500Hz at the constraint to assess the model's ability to withstand swept frequency vibration.

[0058] Among them, different frequency ranges can be set for the assessment of random vibration conditions, for example: 10-100Hz vibration frequency range: 10(m / s2)2 / Hz, 300Hz: 0.51(m / s2)2 / Hz, 500-2000Hz vibration frequency range: 5(m / s2)2 / Hz.

[0059] Specifically, in addition to setting corresponding loads for the model after modal simulation, it can also include: setting different structural damping coefficients for different components of the electric drive assembly (for example: the controller is set to 0.3, and the motor is set to 0.025) to more accurately simulate the model.

[0060] Step S104, based on the load, performing random vibration simulation analysis on the model after the modal simulation, and based on the simulation result of random vibration, performing secondary optimization on the model after the modal simulation to obtain a target model.

[0061] In a specific embodiment, the PSD (power) spectrum of the target component is obtained, and the spectrum is brought into random vibration simulation analysis software (such as abaqus software) to perform random vibration simulation. Then, based on the simulation results of random vibration, the stress distribution of each part of the model after modal simulation is obtained; based on the stress distribution, the NVH sensitive parts of the model after modal simulation are obtained; and the NVH sensitive parts are structurally optimized.

[0062] Specifically, based on the stress distribution, the NVH sensitive parts in the model after modal simulation are obtained, including: judging whether there is an area in the model after modal simulation where the stress level exceeds a reliable threshold, and if so, determining that the area is an NVH sensitive part. The reliable threshold is the yield limit of the component material.

[0063] That is, if there is a part in the target component where the stress level exceeds the yield limit of the target component material, filleting is added to the part or the structure of the target component is changed to reduce the local stress concentration level. For example, for the electric drive assembly, the part where the 3sigma Mises stress exceeds the yield limit of the component material in the simulation results is filled with fillets or the structure is changed to reduce the local stress concentration level to ensure the reliability of the assembly.

[0064] In addition, the simulation results of frequency sweep and random vibration can be used to determine the surface stiffness of the shells in various parts of the assembly. If the surface stiffness of an area is unqualified (for example, the simulation result is less than 10,000 N / mm), structural optimization such as reinforcement or increasing curvature can be performed in advance to solve potential NVH problems.

[0065] In a specific embodiment, the present application can adjust the structural design of the weak position in the electric drive assembly by judging whether the amplitude and stress level of each part of the electric drive assembly exceeds the reliable threshold value during the bench sweep frequency and random vibration test and the actual driving process, and whether the noise, vibration and acoustic roughness exceed the preset NVH index. Among them, the amplitude and stress level meeting the reliable threshold value can be: the vibration acceleration is less than 15G and the Mises stress is less than the material yield limit.

[0066] Specifically, if the amplitude and stress level exceed the reliable threshold and / or the noise, vibration and harshness exceed the preset NVH indicators, the model after modal simulation is subjected to secondary optimization until the amplitude and stress level as well as the noise, vibration and harshness meet the corresponding design conditions.

[0067] Specifically, the second-level optimization may include: adjusting the material, structure (adjusting the structure of the suspension bracket, the position, height and width of the ribs on the motor housing, etc.) and stiffness parameters of the electric drive assembly (suspension, housing, etc.), and quickly iterating through simulation to find the best solution so that the amplitude, stress level and NVH indicators of the electric drive assembly during testing and driving meet the design requirements.

[0068] In summary, this application uses a meshless finite element modeling method to shorten the simulation modeling cycle and reduce the reduction in simulation accuracy caused by the simplification of the more complex component structures in the electric drive assembly by the traditional finite element simulation modeling method. First, the design of the assembly is adjusted in a general direction through the modal simulation results, and then the structural design of the weak position is adjusted through the simulation results of random vibration, so as to quickly predict and optimize the potential NVH and reliability problems of the assembly. Compared with the traditional finite element method, the simulation modeling by the meshless finite element method greatly reduces the modeling time, and the simulation accuracy is improved due to the less simplified components.

[0069] In the second aspect, based on the same inventive concept, this embodiment provides a simulation device based on meshless finite element, such as Figure 2 As shown, including:

[0070] The initial simulation model determination module 401 is used to represent multiple target components in the assembly using separate regions, and to set the performance parameters of each of the multiple target components, as well as the contact relationship between the multiple target components, to obtain an initial simulation model;

[0071] A modal simulation analysis module 402 is used to perform modal simulation analysis on the initial simulation model to determine the structural vibration characteristics of the assembly, and perform a first-level optimization on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation;

[0072] A load setting module 403 is used to set a corresponding load for the model after the modal simulation, wherein the load is the load of the assembly under various working conditions obtained by performing a sweep frequency vibration test on the assembly;

[0073] The target model determination module 404 is used to perform random vibration simulation analysis on the model after the modal simulation based on the load, and perform secondary optimization on the model after the modal simulation based on the simulation result of random vibration to obtain the target model.

[0074] As an optional embodiment, the target model determination module 404 is specifically configured to:

[0075] A stress distribution determination submodule, used to obtain the stress distribution of each part of the model after the modal simulation based on the simulation result of the random vibration;

[0076] An NVH sensitive part determination submodule is used to obtain the NVH sensitive part in the model after the modal simulation based on the stress distribution;

[0077] The structural optimization submodule is used to perform structural optimization on the NVH sensitive parts.

[0078] As an optional embodiment, the NVH sensitive part determination submodule is specifically used for:

[0079] It is determined whether there is an area in the model after the modal simulation where the stress level exceeds the reliable threshold. If so, the area is determined to be an NVH sensitive area.

[0080] As an optional embodiment, the modal simulation analysis module is used to: determine important components from the multiple target components according to design objectives; set corresponding adaptive solution coefficients according to the complexity of the important components to adjust the calculation accuracy of the modal simulation software for the important components; and perform modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0081] As an optional embodiment, the modal simulation analysis module is used to: adjust the calculation accuracy of the modal simulation software based on the change of local energy density in the electric drive assembly or the absolute error of the boundary conditions between regions; and perform modal simulation analysis on the initial simulation model based on the simulation software with adjusted calculation accuracy.

[0082] As an optional embodiment, the initial simulation model determination module is further used to: adjust the number of degrees of freedom associated with each of the multiple target components according to the design requirements for the assembly, so as to obtain the initial simulation model.

[0083] As an optional embodiment, the device also includes: an iterative analysis module, which is used to perform iterative modal simulation analysis on the model after modal simulation after obtaining the model, until the structural vibration characteristics of each target component meet the design requirements.

[0084] The above modules can be implemented by software codes, in which case, the above modules can be stored in the memory of the control device. The above modules can also be implemented by hardware such as integrated circuit chips.

[0085] An embodiment of the present invention provides a simulation device based on meshless finite elements, and its implementation principle and technical effects are the same as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0086] In a third aspect, based on the same inventive concept, this embodiment provides an electronic device 500, such as Figure 3 As shown, it includes: a memory 501, a processor 502 and a computer program 503 stored in the memory and executable on the processor. When the processor 501 executes the program, the steps of the simulation method based on meshless finite element described in the first aspect are implemented.

[0087] Since the electronic device introduced in this embodiment is an electronic device used to implement the simulation method based on meshless finite elements in the embodiment of the present application, based on the simulation method based on meshless finite elements introduced in the embodiment of the present application, a person skilled in the art can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as a person skilled in the art implements the electronic device used in the simulation method based on meshless finite elements in the embodiment of the present application, it belongs to the scope of protection of the present application.

[0088] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0089] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A simulation method based on meshless finite element, characterized in that: Applied to an assembly, the method comprises: Representing multiple target components in the assembly with separate regions, setting performance parameters of each of the multiple target components and contact relationships between the multiple target components, and obtaining an initial simulation model; Performing modal simulation analysis on the initial simulation model to determine the structural vibration characteristics of the assembly, and performing primary optimization on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation; Setting a corresponding load for the model after the modal simulation, wherein the load is a load of the assembly under various working conditions obtained by performing a sweep frequency vibration test on the assembly; Based on the load, a random vibration simulation analysis is performed on the model after the modal simulation, and based on the simulation result of the random vibration, a secondary optimization is performed on the model after the modal simulation to obtain a target model; After obtaining the model after modal simulation, it also includes: performing iterative modal simulation analysis on the model after modal simulation until the structural vibration characteristics of each target component meet the design requirements, wherein the design requirements are to adjust the peak values ​​of each target component to not overlap according to the peak response modal results of the frequency sweep of each target component.

2. The method according to claim 1, characterized in that The simulation result based on random vibration is used to perform secondary optimization on the model after the modal simulation, including: Based on the simulation results of the random vibration, the stress distribution of each part of the model after the modal simulation is obtained; Based on the stress distribution, NVH sensitive parts in the model after the modal simulation are obtained; The NVH sensitive parts are structurally optimized.

3. The method according to claim 2, characterized in that The step of obtaining the NVH sensitive parts in the model after the modal simulation based on the stress distribution includes: It is determined whether there is an area in the model after the modal simulation where the stress level exceeds the reliable threshold. If so, the area is determined to be an NVH sensitive area.

4. The method according to claim 1, characterized in that The performing modal simulation analysis on the initial simulation model comprises: According to the design goal, determining important components from the plurality of target components; According to the complexity of the important components, corresponding adaptive solution coefficients are set to adjust the calculation accuracy of the modal simulation software for the important components; Based on the simulation software after the calculation accuracy is adjusted, modal simulation analysis is performed on the initial simulation model.

5. The method according to claim 1, characterized in that The assembly is an electric drive assembly, and the modal simulation analysis of the initial simulation model includes: Adjusting the calculation accuracy of the modal simulation software based on the change of local energy density in the electric drive assembly or the absolute error of boundary conditions between regions; Based on the simulation software after the calculation accuracy is adjusted, modal simulation analysis is performed on the initial simulation model.

6. The method according to claim 1, characterized in that Before obtaining the initial simulation model, the method further includes: According to the design requirements for the assembly, the number of degrees of freedom associated with each of the plurality of target components is adjusted to obtain an initial simulation model.

7. A simulation device based on meshless finite element, characterized in that: include: An initial simulation model determination module is used to represent multiple target components in the assembly using separate regions, and to set performance parameters of each of the multiple target components, as well as contact relationships between the multiple target components, to obtain an initial simulation model; A modal simulation analysis module, used to perform modal simulation analysis on the initial simulation model, determine the structural vibration characteristics of the assembly, and perform a first-level correction on the initial simulation model based on the structural vibration characteristics to obtain a model after modal simulation; A load setting module, used to set a corresponding load for the model after the modal simulation, wherein the load is obtained by performing a sweep frequency vibration test on the assembly, and is the load of the assembly under various working conditions; A target model determination module is used to perform random vibration simulation analysis on the model after the modal simulation based on the load, and perform a second-level correction on the model after the modal simulation based on the simulation result of random vibration to obtain a target model; The iterative analysis module is used to perform iterative modal simulation analysis on the model after modal simulation after obtaining the model until the structural vibration characteristics of each target component meet the design requirements, wherein the design requirements are to adjust the peak values ​​of each target component to be non-overlapping according to the peak response modal results of the frequency sweep of each target component.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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