NVH (Noise Vibration and Harshness) simulation analysis method, device, equipment, medium and product

Abstract

The invention provides an NVH simulation analysis method, device and equipment, a medium and a product, and relates to the technical field of NVH simulation. The method comprises the steps that whole vehicle data of a target vehicle is split into a plurality of finite element models, and each finite element model meets the mass, rigidity, damping and external load kinetic equation relation; determining a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to the target working condition; the multiple target finite element models are combined, and a combined model corresponding to the target working condition is obtained; and the combined model corresponding to the target working condition is driven to carry out NVH dynamic solution, and an NVH simulation result corresponding to the target working condition is obtained, so that the simulation analysis efficiency of NVH simulation analysis is improved, and the research and development period is shortened.

Description

Technical Field

[0001] The present invention relates to the field of NVH simulation technology, and in particular to an NVH simulation analysis method, device, equipment, medium and product. Background Art

[0002] In the current automobile development process, the development level of NVH (Noise, Vibration, Harshness) performance is an important indicator to measure the comprehensive performance level of a car. At the same time, this performance is also an important indicator that affects consumers' willingness to buy. NVH performance development is divided into two stages: early simulation control and later test acceptance and rectification. In the early NVH simulation process, different vehicle analysis models need to be established for different analysis conditions. For new development projects, it is generally necessary to carry out interior body dynamic stiffness analysis, interior body noise transmission function analysis, interior body vibration transmission function analysis, vehicle acceleration analysis, vehicle idling analysis and vehicle road noise analysis. Six analysis conditions need to be established, so at least six different analysis models need to be established. Figure 1 As shown, Figure 1 This diagram illustrates the complete vehicle analysis models for both single and multiple configurations in traditional NVH analysis methods. Furthermore, for projects where multiple configurations are being developed simultaneously, even more analysis models are required (e.g., simultaneous development of multiple powertrain configurations such as ICE, XEV, and HEV, or multiple battery ranges).

[0003] Therefore, in the current analysis and optimization process, analysis engineers need to conduct multi-performance analysis and verification of each optimization solution. However, establishing different analysis models for different analysis conditions seriously affects analysis efficiency and analysis cycle. Therefore, how to improve the simulation analysis efficiency of NVH simulation analysis and shorten the R&D cycle is a technical problem that needs to be solved in this invention. Summary of the Invention

[0004] The present invention provides an NVH simulation analysis method, device, equipment, medium and product, aiming to overcome the above-mentioned problems or at least partially solve the above-mentioned problems.

[0005] A first aspect of the present invention provides an NVH simulation analysis method, the method comprising:

[0006] The target vehicle's vehicle data is split into multiple finite element models, each of which satisfies the dynamic equations of mass, stiffness, damping, and external loads;

[0007] determining a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to the target working condition;

[0008] Combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition;

[0009] According to the header file corresponding to the target working condition, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution to obtain the NVH simulation result corresponding to the target working condition.

[0010] A second aspect of the present invention provides an NVH simulation analysis device, the device comprising:

[0011] The data splitting module is used to split the vehicle data of the target vehicle into multiple finite element models, each of which satisfies the dynamic equation relationship of mass, stiffness, damping, and external load;

[0012] a model selection module, configured to determine a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to a target working condition;

[0013] a model combination module, configured to combine the plurality of target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition;

[0014] The NVH simulation module is used to drive the combined model corresponding to the target working condition to perform NVH dynamics solution according to the header file corresponding to the target working condition, and obtain the NVH simulation result corresponding to the target working condition.

[0015] A third aspect of the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the computer program is executed by the processor, the NVH simulation analysis method of the first aspect of the present invention is implemented.

[0016] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the NVH simulation analysis method of the first aspect of the present invention is implemented.

[0017] A fifth aspect of the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements the NVH simulation analysis method as described in the first aspect of the present invention.

[0018] In the NVH simulation analysis method provided by the present invention, modular modeling analysis is performed on the whole vehicle data of the target vehicle, and the whole vehicle data of the target vehicle is split into multiple independent finite element models. When performing target working condition analysis, based on the header file corresponding to the target working condition, multiple target finite element models corresponding to the target working condition are determined from multiple finite element models, and the multiple target finite element models are combined to obtain a combined model corresponding to the target working condition, so as to drive the combined model corresponding to the target working condition to perform NVH dynamics solution and obtain NVH simulation results corresponding to the target working condition. The present invention can be applied to the entire development process of NVH simulation, from data modeling to analysis and optimization, to multi-performance balance of schemes, weight reduction scheme verification and other stages; when performing analysis of different working conditions, different finite element models are combined to obtain corresponding combined models, without the need to construct different whole vehicle analysis models, thus saving a lot of workload, solving the problem that multiple working conditions in the current whole vehicle NVH analysis require multiple specific analysis models and the model is not highly universal, improving the analysis efficiency of NVH simulation for multiple working conditions, realizing the overall consideration of the improvement of NVH simulation analysis efficiency, reducing the analysis and optimization time, and reducing the number of optimization scheme iterations, thereby improving the simulation analysis efficiency of the whole vehicle NVH simulation analysis on the basis of shortening the R&D cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 paying any creative labor.

[0020] Figure 1 This is a schematic diagram of the vehicle analysis model corresponding to single configuration and multiple configurations in traditional NVH analysis methods;

[0021] Figure 2 is a flow chart of an NVH simulation analysis method according to an embodiment of the present invention;

[0022] Figure 3 1 is a schematic diagram of modular processing of a vehicle NVH analysis model according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of an interior vehicle body model when the front subframe and the vehicle body are rigidly connected, according to an embodiment of the present invention;

[0024] Figure 5 1 is a schematic diagram of a vehicle body level analysis tooling model after modularization according to an embodiment of the present invention;

[0025] Figure 6This is a schematic diagram of a modular model analysis working condition combination call according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a header file corresponding to vehicle acceleration analysis according to an embodiment of the present invention;

[0027] Figure 8 1 is a comparison diagram of the noise analysis differences between a traditional analysis method and the method of this embodiment shown in one embodiment of the present invention;

[0028] Figure 9 1 is a comparison diagram of the vibration analysis differences between a traditional analysis method and the method of this embodiment shown in one embodiment of the present invention;

[0029] Figure 10 is a logic flow chart of an NVH simulation analysis method according to an embodiment of the present invention;

[0030] Figure 11 This is a structural block diagram of an NVH simulation and analysis device provided by one embodiment of the present invention;

[0031] Figure 12 FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0033] In one embodiment, reference Figure 2 , Figure 2 FIG. 1 is a flow chart of an NVH simulation analysis method according to an embodiment of the present invention. Figure 2 As shown, the NVH simulation analysis method of this embodiment may include the following steps:

[0034] Step S11: Split the entire vehicle data of the target vehicle into multiple finite element models, each finite element model satisfies the dynamic equation relationship of mass, stiffness, damping, and external load.

[0035] The target vehicle in this embodiment is a vehicle to be subjected to NVH simulation analysis. This embodiment, on the basis of satisfying the consistency between simulation and test states, and "seeking common ground while reserving differences" in the models of vehicle-level NVH analysis and body-level NVH analysis, that is, under the principle of sharing the same parts and calling different parts separately, modularly splits the whole vehicle data of the target vehicle. Specifically, the whole vehicle data of the target vehicle is split into multiple finite element models (i.e., multiple "module" models), and each finite element model is independent of each other, that is, each finite element model independently satisfies the relationship between mass, stiffness, damping, and external load dynamic equations.

[0036] The relationship between the mass, stiffness, damping, and external load dynamic equations is: M is the mass matrix, K is the stiffness matrix, C is the damping matrix, U is the displacement, is the velocity quantity, is the acceleration measure, and F is the external load.

[0037] Step S12: determining a plurality of target finite element model components from the plurality of finite element models according to the header file corresponding to the target working condition.

[0038] The target working condition in this embodiment is the analysis working condition for the current NVH analysis to be performed, and the target working condition can be any one of the interior body dynamic stiffness analysis, interior body noise transfer function analysis, interior body vibration transfer function analysis, whole vehicle acceleration analysis, whole vehicle idling analysis, and whole vehicle road noise analysis. In this embodiment, based on the header file corresponding to the target working condition, multiple target finite element models can be determined from multiple finite element models obtained by splitting the whole vehicle data based on the target vehicle. Among them, the target finite element model is the finite element model corresponding to the target working condition, and different target working conditions correspond to the same or different target finite element models. In addition, in this embodiment, a corresponding header file is pre-set for each analysis working condition, and the header file at least defines the relationship between the finite element models under the analysis working condition, the finite element model combination method, and the NVH analysis method.

[0039] Step S13: combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition.

[0040] In this embodiment, after determining multiple target finite element models, the multiple target finite element models can be combined based on the header file corresponding to the target operating condition and the finite element model combination method corresponding to the target operating condition in the header file corresponding to the target operating condition to obtain a combined model corresponding to the target operating condition. This combined model is no longer the "full vehicle analysis model" used in traditional analysis methods, but rather a combination of partial finite element models corresponding to the full vehicle data of the target vehicle. This eliminates the need to consider finite element models unrelated to the target operating condition, reducing the amount of NVH analysis while ensuring the accuracy of the NVH analysis.

[0041] In an optional embodiment, multiple target finite element models may be combined through a conversion matrix to obtain a combined model corresponding to the target working condition.

[0042] Step S14: According to the header file corresponding to the target working condition, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution to obtain the NVH simulation result corresponding to the target working condition.

[0043] In this embodiment, after obtaining the combined model corresponding to the target working condition, the combined model corresponding to the target working condition can be driven to perform NVH dynamics solution according to the header file corresponding to the target working condition. Specifically, each target finite element model in the combined model corresponding to the target working condition can be driven to perform NVH dynamics solution, thereby realizing NVH analysis of the target vehicle under target disclosure and obtaining NVH simulation results corresponding to the target working condition.

[0044] This embodiment is applicable to the entire development process of NVH simulation, from data modeling to analysis and optimization, to multi-performance balancing of solutions, weight reduction solution verification, etc. In this embodiment, when performing different working condition analyses, different finite element models are combined to obtain corresponding combined models, eliminating the need to construct different vehicle analysis models. This saves a lot of work and solves the problem of multiple working conditions requiring multiple specific analysis models and low model universality in current vehicle NVH analysis. It improves the analysis efficiency of NVH simulation for multiple working conditions, achieves a comprehensive consideration of the improvement in the overall NVH simulation analysis efficiency, reduces the analysis and optimization time, and reduces the number of optimization solution iterations, thereby improving the simulation analysis efficiency of vehicle NVH simulation analysis while shortening the R&D cycle.

[0045] In combination with the above embodiments, in one embodiment, the present invention further provides an NVH simulation analysis method. In this method, the "splitting the whole vehicle data of the target vehicle into multiple finite element models" in the above step S11 can specifically include steps S21 to S25:

[0046] Step S21: According to the vehicle model configuration information of the target vehicle, the whole vehicle data of the target vehicle is split into an interior body model, a chassis model, a body-level analysis tooling model, a power model, a tire model and a sound cavity model.

[0047] In this embodiment, the multiple finite element models include at least: interior body model, chassis model, body-level analysis tool model, power model, tire model and acoustic cavity model. In other words, this embodiment can split the whole vehicle data of the target vehicle into interior body model, chassis model, body-level analysis tool model, power model, tire model and acoustic cavity model. Figure 3 As shown, Figure 3 This is a schematic diagram of modular processing of a vehicle NVH analysis model according to an embodiment of the present invention. Figure 3 In the NVH analysis model, the entire vehicle model (i.e., the entire vehicle data) is divided into six finite element models: the interior and body model, the chassis model, the body-level analysis tool model, the powertrain model, the tire model, and the acoustic cavity model. This modularizes the vehicle NVH analysis model. The powertrain model includes at least engine, transmission, and exhaust system data, while the chassis model includes at least front and rear suspension data.

[0048] Step S22: When the vehicle model configuration information indicates a hard connection between the front subframe and the vehicle body, the interior vehicle body model includes the front subframe.

[0049] In this embodiment, the composition of each finite element model (i.e., "module" model) can be planned according to the vehicle type configuration of the target vehicle. The connection between the front subframe and the body can be identified based on the vehicle type configuration information. When the vehicle type configuration information of the target vehicle indicates a hard connection between the front subframe and the body, the interior body model corresponding to the target vehicle includes the front subframe of the target vehicle, while the chassis model does not include the front subframe. Figure 4 As shown, Figure 4 This is a schematic diagram of an interior vehicle body model when the front subframe and the vehicle body are rigidly connected, showing an embodiment of the present invention.

[0050] Step S23: When the vehicle model configuration information indicates a soft connection between the front subframe and the vehicle body, the chassis model includes the front subframe.

[0051] In this embodiment, when the vehicle model configuration information of the target vehicle indicates a hard connection between the front subframe and the vehicle body, the interior vehicle body model corresponding to the target vehicle does not include the front subframe of the target vehicle, but the chassis model corresponding to the target vehicle includes the front subframe of the target vehicle.

[0052] Step S24: When the vehicle model configuration information indicates that the exhaust hook attachment point adopts a final assembly installation form, the vehicle body level analysis tooling model includes a mounting bracket for the exhaust hook attachment point.

[0053] In this embodiment, the body-level tooling analysis model generally includes: dedicated test tooling models for the front damper and rear trailing arm mounting points, and models of the suspension body, chassis swing arm bushing, and rear subframe. In addition, when the target vehicle's model configuration information indicates that the exhaust hook attachment point adopts an assembly installation form, the body-level analysis tooling model corresponding to the target vehicle includes a mounting bracket for the exhaust hook attachment point.

[0054] In one embodiment, the fourth and fifth exhaust hook attachment points adopt a general assembly connection method, and their mounting brackets need to be included in the vehicle body level analysis tooling model. The corresponding complete vehicle body level analysis tooling model is as follows: Figure 5 As shown, Figure 5 1 is a schematic diagram of a modularized vehicle body level analysis tooling model according to an embodiment of the present invention.

[0055] Step S25: When the vehicle configuration information indicates that the exhaust hook attachment point adopts a non-final assembly installation mode, the interior vehicle body model includes a mounting bracket for the exhaust hook attachment point.

[0056] In this embodiment, if the target vehicle's model configuration information indicates that the exhaust hook attachment point utilizes a non-final assembly installation, the interior body model corresponding to the target vehicle includes the mounting bracket for the exhaust hook attachment point. In other words, if the exhaust hook attachment point utilizes a final assembly installation, its final assembly structure must be included in the vehicle-level analysis tooling model. Other exhaust hook and radiator structures are retained directly in the interior body model.

[0057] In a specific example, the first exhaust hook point, the second exhaust hook point, the third exhaust hook point, the radiator, and the rear spring support attachment point of the non-final assembly installation do not need to be located in the body-level analysis tooling model. The analysis excitation area is directly located in the interior body model. The specific processing method can be as described above. Figure 4 shown.

[0058] Furthermore, in conjunction with any of the above embodiments, in one implementation, after the vehicle data is split, pre-processing software can be used to model the individual finite element model data obtained after the splitting, including meshing, adding part material properties, and assembling and connecting parts. For example, meshing is performed using a basic unit size of 8mm for the shell part and a basic unit size of 5mm for the solid part. Properties are set based on the actual material thickness and material grade of the part, and assembly and connection between parts is performed using connection methods such as RBE2, RBE3, SPOT, and AREA.

[0059] Secondly, to ensure the proper execution of vehicle NVH simulation analysis, the node and element numbers, as well as the material property numbers, of each finite element model data are globally uniquely numbered. Number overlap is eliminated to avoid conflicts, and clearance management is employed. In a specific example, the numbering rules for each finite element model are shown in Table 1.

[0060] Table 1 Finite element model unit number range

[0061]

[0062]

[0063] Furthermore, in conjunction with any of the above embodiments, in one implementation, after obtaining the finite element model, the connection nodes and node numbering of the finite element model need to be constructed. Specifically, the nodes of the finite element model include boundary nodes (master degrees of freedom M) and internal nodes (slave degrees of freedom S). Boundary nodes are located in the connection area of ​​each finite element model, and the connection points are selected as assembly connection locations. The connection nodes are modeled using the RBE2 master node method. If an RBE3 slave node connection method is used between finite element models, the RBE3 slave node is converted to an RBE2 master node. Specifically, an RBE2 unit is added to the RBE3 slave node. The master node of the RBE2 unit is the RBE3 slave node, and the slave node unit of the RBE2 unit is the nearby mesh node.

[0064] Furthermore, the connection point numbers of each finite element model (each module model) are planned within 1000 offsets from the starting point. In a specific example, the connection point number planning of each module is shown in Table 2.

[0065] Table 2 Module model connection point number range

[0066]

[0067] In combination with any of the above embodiments, in one embodiment, the present invention further provides an NVH simulation analysis method. In this method, the multiple vehicle-mounted sensor data at least include image data collected by the vehicle-mounted camera; the above step S13 at least includes steps S31 to S32:

[0068] Step S31: According to the header file corresponding to the target working condition, the first target finite element model among the multiple target finite element models is used as the main model, and each target finite element model except the first target finite element model among the multiple target finite element models is used as the slave model, and a first connection node unit matrix between the main model and each slave model is constructed, as well as a second connection node unit matrix between each slave model and the main model.

[0069] In this embodiment, based on the header file corresponding to the target working condition, the first target finite element model among the multiple target finite element models can be used as the master model, and each target finite element model other than the first target finite element model among the multiple target finite element models can be used as the slave model. Different master models correspond to different target working conditions. In this embodiment, the combination of the various target finite element model components is connected using the REB2 rigid method. Specifically, the node degree of freedom motion relationship between the master model and the slave model is locked through the transformation matrix, and the displacement relationship is mapped to the master node.

[0070] Among them, the construction of the conversion matrix is ​​to construct the first connection node unit matrix between the master model and each slave model, and to construct the second connection node unit matrix between each slave model and the master model, so as to construct the conversion matrix corresponding to the target working condition based on the first connection node unit matrix and the second connection node unit matrix. The conversion matrix can be a conversion matrix for coupling between the displacement relationship between models, the mass matrix, and the stiffness matrix.

[0071] For example, the displacement relationship between models, mass matrix, and stiffness matrix coupling can be expressed as the transformation matrix T:

[0072]

[0073] Where I6 is a 6x6 unit matrix, i.e., the first connection node unit matrix and the second connection node unit matrix, indicating that the degrees of freedom of the slave nodes correspond one to one with the master nodes.

[0074] Step S32: On the premise of satisfying the relationship between mass, stiffness, damping, and external load dynamic equations, the multiple target finite element models are combined based on the first connection node unit matrix and the second connection node unit matrix to obtain the combined model.

[0075] In this embodiment, on the premise of satisfying the relationship between the mass, stiffness, damping, and external load dynamic equations, the transformation matrix can be determined based on the obtained first connection node unit matrix and the second connection node unit matrix, and multiple target finite element models can be combined based on the transformation matrix to obtain a combined model.

[0076] For example, the mass matrix and stiffness matrix of each target finite element model can be coupled and condensed through the conversion matrix, and the condensed mass matrix and stiffness matrix can be further substituted into the relationship between mass, stiffness, damping and external load dynamic equations. The post-condensation dynamics equations are solved, and thus the combined model is obtained. The call of each target finite element model is achieved by adding the INCLUDE keyword in the header file, with the format of INCLUDE'filename'. The connection unit information between the target finite element models is achieved by adding connection units in the header file.

[0077] For example, the expression of the post-condensation kinetic equation (the post-condensation kinetic solution equation) is:

[0078]

[0079] Among them, K sub1 is the stiffness matrix of model 1, K sub2 is the stiffness matrix of model 2; M sub1 is the mass matrix of model 1, M sub2 is the mass matrix of model 2, C is the global damping, U is the displacement, is the velocity quantity, is the acceleration measure, and F is the external load.

[0080] In an optional example, the combination of a chassis model and an interior body model is used as an example for explanation, wherein the interior body model is used as the master model and the chassis model is used as the slave model. The corresponding transformation matrix T is expressed as follows:

[0081]

[0082] Among them, I 内饰车身6 is the first connection unit matrix (6x6 unit matrix) between the interior body model and the chassis model, I 底盘6 It is the second connection node identity matrix (6x6 identity matrix) between the chassis model and the interior body model.

[0083] The corresponding dynamic equation expression after combining the interior body model and chassis model is:

[0084]

[0085] Among them, K 内饰车身 is the stiffness matrix of the interior body model, K 底盘 is the stiffness matrix of the chassis model; M 内饰车身 is the mass matrix of the interior body model, M 底盘 is the mass matrix of the chassis model, C is the global damping, U is the displacement, is the velocity quantity, is the acceleration measure, and F is the external load.

[0086] Similarly, the assembly connection between other target finite element models is completed in the above manner, thereby realizing the combination of multiple target finite element models to obtain a combined model corresponding to the target working condition.

[0087] In combination with any of the above embodiments, in one implementation, the present invention further provides an NVH simulation analysis method. In this method, the above step S13 may specifically include steps S41 to S43:

[0088] Step S41: When the target working condition is any one of vehicle acceleration analysis, vehicle idling analysis and vehicle road noise analysis, the interior body model, the chassis model, the power model, the tire model and the acoustic cavity model are combined to obtain a combined model corresponding to the target working condition.

[0089] In this embodiment, when the target operating condition is any of vehicle acceleration analysis, vehicle idle analysis, and vehicle road noise analysis, the multiple target finite element models include: an interior and vehicle body model, a chassis model, a powertrain model, a tire model, and an acoustic cavity model. Based on this, the interior and vehicle body model, chassis model, powertrain model, tire model, and acoustic cavity model are combined based on the header file corresponding to the target operating condition to obtain the combined model corresponding to the target operating condition.

[0090] Step S42: When the target working condition is interior vehicle body noise transfer function analysis, the interior vehicle body model, the acoustic cavity model and the vehicle body level analysis tooling model are combined to obtain a combined model corresponding to the target working condition.

[0091] In this embodiment, when the target operating condition is interior-body noise transfer function analysis, the multiple target finite element models include: an interior-body model, an acoustic cavity model, and a vehicle-level analysis tooling model. Based on the header file corresponding to the target operating condition (i.e., interior-body noise transfer function analysis), the interior-body model, acoustic cavity model, and vehicle-level analysis tooling model are combined to obtain a combined model corresponding to the target operating condition.

[0092] Step S43: When the target working condition is interior body dynamic stiffness analysis or interior body vibration transfer function analysis, the interior body model and the body-level analysis tooling model are combined to obtain a combined model corresponding to the target working condition.

[0093] In this embodiment, when the target working condition is an interior-body dynamic stiffness analysis or an interior-body vibration transfer function analysis, the multiple target finite element models include an interior-body model and a body-level analysis tooling model. Based on the header file corresponding to the target working condition, the interior-body model and the body-level analysis tooling model are combined to obtain the combined model corresponding to the target working condition.

[0094] In one embodiment, if Figure 6 As shown, Figure 6 This is a schematic diagram of a modular model analysis condition combination call according to an embodiment of the present invention. The model call combination corresponding to each analysis condition is as follows: Figure 6 As shown, in Figure 6 In the analysis, when the target working condition is the whole vehicle idle speed analysis (i.e., idle speed working condition noise and vibration analysis), the interior body model, chassis model, power model, tire model and acoustic cavity model are combined through the corresponding idle speed analysis header file; when the target working condition is the whole vehicle acceleration analysis (i.e., acceleration working condition noise and vibration analysis), the interior body model, chassis model, power model, tire model and acoustic cavity model are combined through the corresponding acceleration analysis header file; when the target working condition is the whole vehicle road noise analysis (i.e., road noise and vibration analysis), the interior body model, chassis model, power model, tire model and acoustic cavity model are combined through the corresponding road noise analysis header file. When the target working condition is interior body noise transmission function analysis (i.e. interior body NTF analysis), the interior body model, acoustic cavity model and body-level analysis tooling model are combined through the corresponding NTF analysis header file; when the target working condition is interior body dynamic stiffness analysis (i.e. interior body IPI analysis), the interior body model and body-level analysis tooling model are combined through the corresponding IPI analysis header file; when the target working condition is interior body vibration transmission function analysis (i.e. interior body VTF analysis), the interior body model and body-level analysis tooling model are combined through the corresponding VTF analysis header file.

[0095] In combination with the above embodiments, in one embodiment, the present invention further provides an NVH simulation analysis method. In this method, in addition to the above steps, it may also include step S51 and step S52:

[0096] Step S51: when the whole vehicle data of the target vehicle is updated, a new interior and body model is obtained according to the updated whole vehicle data of the target vehicle.

[0097] In this embodiment, during vehicle development and testing, such as when correcting model errors, updating product data, or verifying subsequent weight reduction plans, the target vehicle's full vehicle data may be updated, resulting in updated full vehicle data for the target vehicle. When the target vehicle's full vehicle data is updated, a new interior and body model can be derived based on the updated full vehicle data.

[0098] Step S52: Based on the new interior body model, a new combined model corresponding to any one of vehicle acceleration analysis, vehicle idle analysis, vehicle road noise analysis, interior body noise transfer function analysis, interior body dynamic stiffness analysis, and interior body vibration transfer function analysis is obtained.

[0099] In this embodiment, based on the new interior body model obtained, a new combined model corresponding to any one of the analysis conditions of vehicle acceleration analysis, vehicle idle analysis, vehicle road noise analysis, interior body noise transfer function analysis, interior body dynamic stiffness analysis and interior body vibration transfer function analysis can be obtained.

[0100] In conjunction with the above embodiments, in one implementation, an embodiment of the present invention further provides an NVH simulation analysis method. In this method, the header file corresponding to the target operating condition includes at least one of the following: analysis method and output setting information, loading target operating condition setting information, super unit and / or model call setting information, model connection setting information, and motion relationship call setting information.

[0101] In this embodiment, at least one of the analysis method and output setting information, target working condition loading setting information, super unit and / or model call setting information, model connection setting information, and motion relationship call setting information can be integrated into a header file corresponding to a target working condition with the help of a text editor. In a specific example, the analysis working condition and method, excitation data, response point output, model call, model global damping, module model connection relationship, and vehicle motion relationship setting information can be integrated into a header file with the help of a text editor. During task calculation, the header file corresponding to the target working condition and each finite element model must be submitted at the same time. When performing working condition analysis, different models are called for NVH calculation based on the corresponding target working condition.

[0102] like Figure 7 As shown, Figure 7 This is a schematic diagram of a header file corresponding to vehicle acceleration analysis according to an embodiment of the present invention. Figure 7 The header file includes from top to bottom: super unit call settings, analysis method and output settings (i.e. calculation method and output settings), loading target condition settings (i.e. loading condition settings), output data processing settings, global damping settings, calling module model and excitation data settings (i.e. calling module model and excitation file), connection position settings between models (i.e. connection model settings), and motion relationship call settings.

[0103] In combination with the above embodiments, in one embodiment, the present invention further provides an NVH simulation analysis method. In this method, before the above step S13, step S61 may be further included, and the above step S13 may specifically include step S62:

[0104] Step S61: for each target finite element model among the multiple target finite element models, the degrees of freedom of the internal nodes of the target finite element model are condensed to the degrees of freedom of the boundary nodes of the target finite element model, the internal dynamic motion relationship is retained, and the super element corresponding to the target finite element model is obtained.

[0105] In this embodiment, in order to further improve the efficiency of NVH simulation analysis, a free interface modal condensation method is adopted, that is, each sub-module model (each target finite element model) is condensed: for each target finite element model in multiple target finite element models, the degrees of freedom of the internal nodes of the target finite element model are condensed to the degrees of freedom of the boundary nodes of the target finite element model, retaining the internal dynamic motion relationship, achieving accurate influence on the dynamic response of the main model, and obtaining the super element corresponding to the target finite element model. Among them, the model nodes in the finite element model include boundary nodes (master degrees of freedom M) and internal nodes (slave degrees of freedom S); the boundary nodes are located in the connection area of ​​each finite element model.

[0106] Step S62: combining the super elements corresponding to the plurality of target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition.

[0107] In this embodiment, after obtaining superelements corresponding to multiple target finite element models, the superelements corresponding to the multiple target finite element models can be combined based on the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition.

[0108] In a specific embodiment, the mathematical essence of the free interface mode condensation method is to condense the stiffness matrix K, mass matrix M, and the finite element model into a smaller equivalent matrix k through matrix transformation. 缩 、M 缩 In this embodiment, the free mode superelement method is used, and the relevant superelement generation can be completed with the help of the Optstruct solver.

[0109] Specifically, the connection area between each target finite element model can be set as a free interface boundary node through the BNDFRE statement, and the degree of freedom of the boundary node DOF1-DOF6 is released; and the key command CMSMETH is used to solve the modal matrix of the free vibration equation based on the free boundary node. The expression for solving the free interface modal free vibration equation is: In the formula represents the square of the i-th order natural mode frequency, Φ i is the i-th order free interface mode, K is the stiffness matrix of the target finite element model, and M is the mass matrix of the target finite element model. The first N order modes are extracted, and the N-order corresponding frequency mode is selected to be 1.5 times the calculation frequency of the target working condition for solution;

[0110] Furthermore, based on the static equilibrium equation, a unit displacement is applied to the boundary nodes of the target finite element model to obtain the deformation results of the internal nodes of the target finite element model, and the static deformation results are superimposed with the free interface mode to obtain the total deformation of the module model. Among them, the static equilibrium equation expression of the internal node deformation is: K ss U s +K sm U m =0; where K ss represents the stiffness between internal degrees of freedom, K sm represents the stiffness of the coupling between internal and boundary degrees of freedom, U s represents the internal node displacement, U m represents the displacement of the boundary node. Then substitute the total deformation into the motion equation without considering damping ( M is the mass matrix, K is the stiffness matrix, U is the displacement, is the acceleration measure, F is the external load), and the mass matrix M after condensation is obtained 缩 and the stiffness matrix k 缩 And the load vector condensation matrix; and output the relevant dynamic characteristics information to the h3d file through the PARAM and EXTOUT statements, add the ASSIGN keyword in the calculation header file to import it into the global model for dynamic response solution.

[0111] In this embodiment, the free interface modal synthesis method is used to solve the super-element. Its advantages are fully utilized in the complex dynamic models such as acoustic-solid coupling and global vibration transmission of the whole vehicle in the NVH analysis. While improving the analysis efficiency, the accuracy of the analysis results is guaranteed. In other words, this embodiment uses the free interface modal synthesis method to condense and solve the mass and stiffness matrices of each target finite element model. This method can capture the dynamic characteristics of the interface and take into account the influence of structural vibration at the loading point position by solving the modal under the free interface state, making the acoustic-solid coupling analysis and whole vehicle vibration analysis excitation in the NVH analysis more complete, thereby ensuring that the analysis accuracy is improved while reducing the analysis optimization time, reducing the number of optimization scheme iterations, and thus improving the efficiency of the whole vehicle NVH simulation.

[0112] In a specific example, the acceleration analysis calculation of the whole vehicle is carried out by taking the interior body model as the object for relevant explanation: the nodes of the connection area between the interior body model and each target finite element model are set as free interface boundary nodes through the BNDFRE statement, the specific statement is: BNDFRE1, 123456, node number (1001, 1002, 1003, etc.); then the CMSMETH key command solves the free interface mode of the interior body model based on the vibration equation (the expression of the free interface mode free vibration equation is: in, represents the square of the i-th order natural modal frequency of the interior body model, Φ i is the i-th order free interface mode of the interior body model). Since the analysis frequency is 200Hz, the modal calculation range is 0-300Hz, and the corresponding calculation statement is: CMSMETH, 25000002, GM, 300.0, 6148726. At the same time, AMSES10.0 and DMIGDV statements are added to the above statement to complete the interior body model connection point based on the static equilibrium equation (K 内饰车身内部 U 内饰车身内部 +K 内饰车身外部 U 内饰车身外部 =0, where K 内饰车身内部 represents the stiffness between the internal degrees of freedom of the interior body model, K 内饰车身内外部 represents the coupling stiffness between the interior and boundary degrees of freedom of the interior body model, U 内饰车身内部 represents the internal node displacement of the interior body model, U 内饰车身外部 represents the displacement of nodes in the connection area between the interior body model and other models) to obtain the internal static deformation and substitute the deformation into the undamped motion equation The mass matrix of the interior body model and the stiffness matrix of the interior body model after condensation and the load vector condensation matrix are obtained, and the dynamic characteristic information is output to the H3D file using the PARAM and EXTOUT statements; and Figure 7 In the superelement call settings shown in , add the ASSIGN keyword in the header file to import it into the global model for dynamic response solution.

[0113] As shown in Table 3, in one embodiment, the super-element solution method of the above embodiment is adopted. While reducing the analysis time by 70%, the accuracy of the condensed model is improved from 85% to more than 95%, thereby improving the optimization efficiency by 26.9%. That is, by reducing the analysis error caused by the super-element method, the number of optimization scheme iterations is reduced, thereby ensuring that the optimization scheme is quickly iterated.

[0114] Table 3 Comparison of super-element calculation accuracy and time

[0115]

[0116] Figure 8 FIG. 1 is a comparison diagram of noise analysis differences between a traditional analysis method and the method of this embodiment shown in an embodiment of the present invention. Figure 9 This is a comparison diagram of the difference between a traditional analysis method and the vibration analysis method of this embodiment shown in an embodiment of the present invention. Figure 8 and 9Comparing the noise and vibration analysis results shown, the road noise calculation analysis shows that the curve trends are consistent, with a maximum amplitude difference of 0.5dBA; the steering wheel vibration transfer function analysis shows that the curve trends are consistent, with a maximum amplitude difference of 0.02mm / s and an error of 6.7%. Based on existing simulation analysis experience, noise analysis within 1dBA difference and vibration analysis within 10% error are considered to have high model simulation accuracy, further demonstrating the scalability of the method of the present invention.

[0117] In conjunction with the above embodiments, in one implementation, an embodiment of the present invention further provides an NVH simulation analysis method. In this method, before step S14, steps S71 to S72 may be further included. In addition, the step S14 of "driving the combined model corresponding to the target working condition to perform NVH dynamics solution based on the header file corresponding to the target working condition" may specifically include step S73:

[0118] Step S71: performing modal analysis on the combined model corresponding to the target working condition to obtain a modal calculation result.

[0119] In this embodiment, after obtaining the combined model corresponding to the target working condition, it is necessary to perform correction using modal analysis, that is, perform modal analysis verification: perform modal analysis on the combined model corresponding to the target working condition to obtain a modal calculation result.

[0120] Step S72: Compare the modal calculation result with a preset reference range to determine whether the combined model corresponding to the target working condition passes modal verification.

[0121] In this embodiment, a preset reference range corresponding to each typical mode is set in advance. The preset reference range represents a reasonable range of modal distribution and represents that the modal verification has been passed. After obtaining the modal calculation result, the modal calculation result can be compared with the preset reference range to determine whether the combined model corresponding to the target working condition has passed the modal verification. Specifically, it is to determine whether the modal calculation result falls within the preset reference range. If the modal calculation result falls within the preset reference range, it is determined that the combined model corresponding to the target working condition has passed the modal verification; if the modal calculation result does not fall within the preset reference range, it is determined that the combined model corresponding to the target working condition has failed the modal verification.

[0122] In one optional example, the vehicle acceleration analysis header file can be modified from the analysis calculation condition to a modal calculation condition, with a modal calculation frequency of 0-50Hz. If the model cannot be calculated normally, if there are missing or incorrect connections between the various models, or if the typical modal distribution is not within an acceptable range, the header file settings and the model connection information settings need to be checked and corrected. In one optional example, the evaluation criteria for the typical vehicle modes are implemented according to Table 4. If the relevant models can be analyzed normally and the typical modes are normal, the relevant analysis can be carried out.

[0123] Table 4 Typical modal distribution range of vehicle model

[0124]

[0125] Step S73: When the combined model corresponding to the target working condition passes the modal verification, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution according to the header file corresponding to the target working condition.

[0126] In this embodiment, when it is determined that the combined model corresponding to the target working condition passes the modal verification, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution according to the header file corresponding to the target working condition.

[0127] In one example, the connections between the various target finite element models are normal, with no missed or misconnected connections. The corresponding typical modal values ​​are shown in Table 5, which indicates that the modal distribution is reasonable, that is, the combined model corresponding to the target working condition passes the modal verification.

[0128] Table 5 Comparison of typical modal calculation results in the example project

[0129]

[0130] In one embodiment, if Figure 10 As shown, Figure 10 This is a logic flow chart of an NVH simulation analysis method according to an embodiment of the present invention. Figure 10In this paper, a new NVH analysis method based on modular modeling and using the free interface modal synthesis method to generate super units is provided: the whole vehicle data is split into module models, which are divided into six module models: interior body model, chassis model, body-level analysis tooling model, power model, tire model, and acoustic cavity model; then the module models are finite element modeled, that is, numbered, and the nodes and unit numbers and material property numbers of each module model are globally uniquely numbered, and no number overlap occurs; then the connection nodes of the module model are established and the numbering of the connection nodes is planned; then, based on different analysis conditions, different module models are combined and connected using the conversion matrix to form an overall mass stiffness damping matrix, so that the module models can be assembled and combined to complete the establishment of the analysis model (that is, the combined model); finally, the combined model is subjected to NVH analysis using super units.

[0131] Compared with the traditional NVH simulation and analysis method, the embodiments of the present invention can effectively reduce the number of professional analysis models. For example, for the six professional analysis models required for a single configuration, the six professional analysis models for the whole vehicle NVH simulation can be simplified into a combined analysis model of a modular group model plus a text file (header file), as shown in Table 6. In the early stage of analysis model building, model error correction, product data update and subsequent weight reduction plan verification can save about 80% of the workload. The free interface modal synthesis is further adopted to generate a super-element analysis method, which allows the boundary nodes to move freely when the analysis model is condensed, taking into account the overall dynamic characteristics, and is more suitable for the acoustic-solid coupling and overall vibration transmission characteristics in the existing NVH analysis. That is, the accuracy of the condensed model can be improved from 85% to 95% while reducing the analysis time, so that the iterative process of the optimization scheme in the NVH analysis optimization using the super-element method has a smaller error than the actual one, thereby ensuring the rapid iteration of the optimization scheme and improving the analysis and optimization efficiency by 26.9%. Compared with the traditional reduction optimization method, the invented method not only improves the analysis efficiency of a single working condition, but also improves the efficiency of the six commonly used working conditions of the entire NVH simulation analysis, which is specifically manifested in: when the shrinkage of an interior body model After the reduced unit is generated, it can be quickly brought into the calculation header files of the six working conditions to complete multiple performance verifications at one time. Compared with traditional analysis methods, this can save 3-6 hours of calculation time for generating super units at a time, and improve analysis efficiency by about 29%; in the whole vehicle NVH analysis and development process, the method of this embodiment can perform multiple rounds of iterative verification on the structural optimization plan for normal time cycle projects (projects with sufficient time cycle), which can make the plan better (good performance and low cost); for projects with a short development cycle (i.e., projects with a tight time cycle), the method of this embodiment can alleviate the performance achievement risk caused by the failure to complete structural optimization due to insufficient time to a certain extent, thereby ensuring the project development progress and project quality.

[0132] Table 6 - Application status of example projects

[0133]

[0134] It should be noted that for the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0135] Based on the same inventive concept, an embodiment of the present invention provides an NVH simulation analysis device. Figure 11 , Figure 11 This is a structural block diagram of the NVH simulation analysis device provided by one embodiment of the present invention. Figure 11 As shown, the device includes:

[0136] The data splitting module is used to split the vehicle data of the target vehicle into multiple finite element models, each of which satisfies the dynamic equation relationship of mass, stiffness, damping, and external load;

[0137] a model selection module, configured to determine a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to a target working condition;

[0138] a model combination module, configured to combine the plurality of target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition;

[0139] The NVH simulation module is used to drive the combined model corresponding to the target working condition to perform NVH dynamics solution according to the header file corresponding to the target working condition, and obtain the NVH simulation result corresponding to the target working condition.

[0140] Optionally, the data splitting module includes:

[0141] A model determination module is used to split the entire vehicle data of the target vehicle into an interior body model, a chassis model, a body-level analysis tooling model, a power model, a tire model, and an acoustic cavity model according to the model configuration information of the target vehicle;

[0142] a first configuration module, configured to, when the vehicle model configuration information indicates a hard connection between the front subframe and the vehicle body, configure the interior vehicle body model to include the front subframe;

[0143] a second configuration module, configured to, when the vehicle model configuration information indicates a soft connection between the front subframe and the vehicle body, configure the chassis model to include the front subframe;

[0144] a third configuration module, configured to, when the vehicle model configuration information indicates that the exhaust hook attachment point adopts a final assembly installation form, configure the vehicle body-level analysis tooling model to include a mounting bracket for the exhaust hook attachment point;

[0145] The fourth configuration module is configured to, when the vehicle model configuration information indicates that the exhaust hook attachment point adopts a non-final assembly installation form, comprise a mounting bracket for the exhaust hook attachment point on the interior vehicle body model.

[0146] Optionally, the model combination module includes:

[0147] a matrix construction module, configured to construct, based on a header file corresponding to the target working condition, a first target finite element model among the multiple target finite element models as a master model, and each target finite element model among the multiple target finite element models except the first target finite element model as a slave model, a first connection node unit matrix between the master model and each slave model, and a second connection node unit matrix between each slave model and the master model;

[0148] The first combination module is used to combine the multiple target finite element models based on the first connection node unit matrix and the second connection node unit matrix to obtain the combined model, under the premise of satisfying the relationship between mass, stiffness, damping, and external load dynamic equations.

[0149] Optionally, the model combination module includes:

[0150] a second combining module, configured to combine the interior body model, the chassis model, the power model, the tire model, and the acoustic cavity model to obtain a combined model corresponding to the target operating condition when the target operating condition is any one of vehicle acceleration analysis, vehicle idle analysis, and vehicle road noise analysis;

[0151] a third combining module, configured to combine the interior vehicle body model, the acoustic cavity model, and the vehicle body-level analysis tooling model to obtain a combined model corresponding to the target working condition when the target working condition is interior vehicle body noise transfer function analysis;

[0152] The fourth combination module is used to combine the interior body model and the body-level analysis tooling model to obtain a combined model corresponding to the target working condition when the target working condition is interior body dynamic stiffness analysis or interior body vibration transfer function analysis.

[0153] Optionally, the device further comprises:

[0154] a data updating module, configured to obtain a new interior and body model according to the updated vehicle data of the target vehicle when the vehicle data of the target vehicle is updated;

[0155] The model updating module is used to obtain a new combined model corresponding to any one of the vehicle acceleration analysis, vehicle idle analysis, vehicle road noise analysis, interior body noise transfer function analysis, interior body dynamic stiffness analysis and interior body vibration transfer function analysis based on the new interior body model.

[0156] Optionally, the device further comprises:

[0157] a superelement calculation module, configured to, before combining the multiple target finite element models according to the header file corresponding to the target working condition, for each of the multiple target finite element models, condense the degrees of freedom of the internal nodes of the target finite element model to the degrees of freedom of the boundary nodes of the target finite element model, retain the internal dynamic motion relationship, and obtain a superelement corresponding to the target finite element model;

[0158] Model combination module, including:

[0159] The super-element combination module is used to combine the super-elements corresponding to the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition.

[0160] Optionally, the device further comprises:

[0161] a modal calculation module, configured to perform modal analysis on the combined model corresponding to the target working condition to obtain a modal calculation result before driving the combined model corresponding to the target working condition to perform NVH dynamics solution according to a header file corresponding to the target working condition;

[0162] a modal verification module, configured to compare the modal calculation result with a preset reference range to determine whether the combined model corresponding to the target operating condition passes modal verification;

[0163] NVH simulation module, including:

[0164] The simulation calculation module is used to drive the combined model corresponding to the target working condition to perform NVH dynamics solution according to the header file corresponding to the target working condition when the combined model corresponding to the target working condition passes the modal verification.

[0165] Optionally, the header file corresponding to the target operating condition includes at least one of the following:

[0166] Analysis method and output setting information;

[0167] Load target working condition setting information;

[0168] superelement and / or model call setup information;

[0169] Model connection setting information;

[0170] Motion relationship call setup information.

[0171] Based on the same inventive concept, another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the NVH simulation analysis method described in any of the above embodiments of the present invention are implemented.

[0172] Based on the same inventive concept, another embodiment of the present invention provides an electronic device, such as Figure 12 shown. Figure 12 The figure is a schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When executed by the processor, the computer program implements the steps of the NVH simulation analysis method according to any of the above embodiments of the present invention.

[0173] Based on the same inventive concept, another embodiment of the present invention provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the NVH simulation analysis method described in any of the above embodiments of the present invention.

[0174] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0175] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0176] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0177] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the process in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0178] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0179] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0180] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. 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 embodiments of the present invention.

[0181] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0182] The above is a detailed introduction to the NVH simulation analysis method, device, equipment, medium and product provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A NVH simulation analysis method, characterized in that: The method comprises: The target vehicle's vehicle data is split into multiple finite element models, each of which satisfies the dynamic equations of mass, stiffness, damping, and external loads; determining a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to the target working condition; Combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition; According to the header file corresponding to the target working condition, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution to obtain the NVH simulation result corresponding to the target working condition.

2. The NVH simulation analysis method according to claim 1, characterized in that: The target vehicle's full vehicle data is split into multiple finite element models, including: According to the model configuration information of the target vehicle, the whole vehicle data of the target vehicle is split into an interior body model, a chassis model, a body-level analysis tooling model, a power model, a tire model and a sound cavity model; In a case where the vehicle model configuration information indicates a hard connection between the front subframe and the vehicle body, the interior vehicle body model includes the front subframe; In the case where the vehicle model configuration information represents a soft connection between the front subframe and the vehicle body, the chassis model includes the front subframe; In a case where the vehicle model configuration information indicates that the exhaust hook attachment point adopts a final assembly installation form, the vehicle body level analysis tooling model includes a mounting bracket for the exhaust hook attachment point; When the vehicle model configuration information indicates that the exhaust hook attachment point adopts a non-final assembly installation form, the interior vehicle body model includes a mounting bracket for the exhaust hook attachment point.

3. The NVH simulation analysis method according to claim 1, characterized in that: Combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition includes: According to the header file corresponding to the target working condition, taking the first target finite element model among the multiple target finite element models as the master model and each target finite element model except the first target finite element model among the multiple target finite element models as the slave models, constructing a first connection node unit matrix between the master model and each slave model, and a second connection node unit matrix between each slave model and the master model; On the premise of satisfying the relationship between mass, stiffness, damping and external load dynamic equations, the multiple target finite element models are combined based on the first connection node unit matrix and the second connection node unit matrix to obtain the combined model.

4. The NVH simulation analysis method according to claim 2, characterized in that: Combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition includes: When the target operating condition is any one of vehicle acceleration analysis, vehicle idling analysis, and vehicle road noise analysis, combining the interior body model, the chassis model, the power model, the tire model, and the acoustic cavity model to obtain a combined model corresponding to the target operating condition; When the target working condition is interior-body noise transfer function analysis, the interior-body model, the acoustic cavity model, and the body-level analysis tooling model are combined to obtain a combined model corresponding to the target working condition; When the target working condition is interior body dynamic stiffness analysis or interior body vibration transfer function analysis, the interior body model and the body-level analysis tooling model are combined to obtain a combined model corresponding to the target working condition.

5. The NVH simulation analysis method according to claim 2, characterized in that: The method further comprises: When the whole vehicle data of the target vehicle is updated, a new interior and body model is obtained according to the updated whole vehicle data of the target vehicle; Based on the new interior body model, a new combined model corresponding to any one of the vehicle acceleration analysis, vehicle idling analysis, vehicle road noise analysis, interior body noise transfer function analysis, interior body dynamic stiffness analysis and interior body vibration transfer function analysis is obtained.

6. The NVH simulation analysis method according to claim 1, characterized in that: Before combining the multiple target finite element models according to the header file corresponding to the target working condition, the method further includes: For each target finite element model among the multiple target finite element models, the degrees of freedom of the internal nodes of the target finite element model are condensed to the degrees of freedom of the boundary nodes of the target finite element model, the internal dynamic motion relationship is retained, and a super element corresponding to the target finite element model is obtained; Combining the multiple target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition includes: According to the header file corresponding to the target working condition, super elements corresponding to the multiple target finite element models are combined to obtain a combined model corresponding to the target working condition.

7. The NVH simulation analysis method according to claim 1, characterized in that: Before driving the combined model corresponding to the target operating condition to perform NVH dynamics solution according to the header file corresponding to the target operating condition, the method further includes: Performing modal analysis on the combined model corresponding to the target working condition to obtain modal calculation results; Comparing the modal calculation result with a preset reference range to determine whether the combined model corresponding to the target working condition passes modal verification; According to the header file corresponding to the target working condition, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution, including: When the combined model corresponding to the target working condition passes the modal verification, the combined model corresponding to the target working condition is driven to perform NVH dynamics solution according to the header file corresponding to the target working condition.

8. The NVH simulation analysis method according to any one of claims 1 to 7, characterized in that: The header file corresponding to the target working condition includes at least one of the following: Analysis method and output setting information; Load target working condition setting information; superelement and / or model call setup information; Model connection setting information; Motion relationship call setup information.

9. An NVH simulation analysis device, characterized in that: The device comprises: The data splitting module is used to split the vehicle data of the target vehicle into multiple finite element models, each of which satisfies the dynamic equation relationship of mass, stiffness, damping, and external load; a model selection module, configured to determine a plurality of target finite element models from the plurality of finite element models according to a header file corresponding to a target working condition; a model combination module, configured to combine the plurality of target finite element models according to the header file corresponding to the target working condition to obtain a combined model corresponding to the target working condition; The NVH simulation module is used to drive the combined model corresponding to the target working condition to perform NVH dynamics solution according to the header file corresponding to the target working condition, and obtain the NVH simulation result corresponding to the target working condition.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is executed by the processor, the NVH simulation analysis method according to any one of claims 1 to 8 is implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the NVH simulation analysis method according to any one of claims 1 to 8 is implemented.

12. A computer program product, characterized in that The method comprises a computer program which, when executed by a processor, implements the NVH simulation analysis method according to any one of claims 1 to 8.

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