Electric drive assembly dynamic knocking simulation method, device and equipment

Abstract

The invention relates to the technical field of mechanical design, discloses an electric drive assembly dynamic knocking simulation method, device and equipment, and is applied to an electric drive assembly transmission system. Performing transmission equivalence on a transmission part in the electric drive assembly transmission system to obtain an equivalent part model of the transmission part; performing response characteristic analysis on the equivalent component model, performing equivalent conversion according to response characteristics of the equivalent component model, and determining equivalent response parameters of the transmission component; performing simulation model modeling on the electric drive assembly transmission system according to the equivalent response parameters to obtain a transmission system model; and performing knocking simulation according to the transmission system model to obtain a knocking simulation analysis result which is used for analyzing the knocking condition in the electric drive assembly transmission system. The method has the beneficial effects that equivalent processing and parameter calculation are carried out on the transmission part in the electric drive assembly transmission system, so that specific modeling can be carried out on the transmission part according to a parameter calculation result, and the comprehensiveness of knocking condition analysis is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical design, and in particular to a method and device for simulating dynamics knocking of an electric drive assembly. BACKGROUND

[0002] An electric drive assembly transmission system is a system in a vehicle for transmitting power of an electric motor to a driving wheel or other mechanical structure of the vehicle, and includes the electric motor and a plurality of transmission components, which form meshing pairs. When torque switching occurs, the actual contact surface between each meshing pair also switches, and the side clearance between the transmission components causes relative displacement between the driving side and the driven side in the meshing pair, and knocking noise is generated at the moment when the actual contact surface switching is completed. In order to improve the experience of users during driving of the vehicle, it is necessary to locate the cause of the noise and make corresponding improvement design. In the related art of analyzing the knocking condition in the electric drive assembly transmission system, the comprehensiveness of the analysis of the transmission components still needs to be improved. SUMMARY

[0003] The present application provides a method and device for simulating dynamics knocking of an electric drive assembly, which performs equivalent processing and parameter calculation on transmission components in the electric drive assembly transmission system, so as to perform specific modeling on the transmission components according to the parameter calculation results, and effectively improve the comprehensiveness of the knocking condition analysis.

[0004] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present application includes:

[0005] In a first aspect, the present application provides a method for simulating dynamics knocking of an electric drive assembly, applied to an electric drive assembly transmission system; the method includes:

[0006] performing transmission equivalence on transmission components in the electric drive assembly transmission system to obtain an equivalent component model of the transmission components;

[0007] performing response characteristic analysis on the equivalent component model, and performing equivalent conversion according to the response characteristic of the equivalent component model to determine equivalent response parameters of the transmission components;

[0008] modeling the electric drive assembly transmission system according to the equivalent response parameters to obtain a transmission system model;

[0009] performing knocking simulation according to the transmission system model to obtain knocking simulation analysis results, which are used to analyze the knocking condition in the electric drive assembly transmission system.

[0010] The electric drive assembly dynamics knocking simulation method provided in the embodiments of the present application equivalently processes the transmission components in the electric drive assembly transmission system according to the transmission characteristics of the transmission components, obtains an equivalent component model containing multiple equivalent components, and analyzes the response characteristics of the equivalent components to obtain equivalent response parameters of the corresponding transmission components. A transmission system model is constructed according to the equivalent response parameters, and is used for knocking simulation to obtain a knocking simulation analysis result. Compared with related technologies, the present application equivalently processes the transmission components into an equivalent component model through equivalent analysis, and thus can determine the equivalent response parameters of the transmission components according to the response characteristics of the equivalent component model. On this basis, the equivalent response parameters of the transmission components are used as the data basis for modeling of the simulation model, and the transmission components are specifically modeled, so that the corresponding transmission components can be specifically analyzed in the knocking simulation, the comprehensiveness of the knocking condition analysis is effectively improved, and the accuracy of the knocking simulation analysis result is improved.

[0011] Optionally, the equivalent component model includes an equivalent component corresponding to the transmission component; and the transmission equivalent processing of the transmission components in the electric drive assembly transmission system to obtain the equivalent component model of the transmission component includes:

[0012] equivalent application according to the design parameters of the transmission component to determine the equivalent number and geometric parameters of the equivalent component;

[0013] finite element modeling of the equivalent component according to the equivalent number and the geometric parameters to obtain the equivalent component model.

[0014] Optionally, the response characteristic analysis of the equivalent component model and the equivalent conversion according to the response characteristics of the equivalent component model to determine the equivalent response parameters of the transmission component include:

[0015] response analysis of the equivalent component model to obtain the response characteristics between the equivalent components in the equivalent component model;

[0016] coincidence degree conversion of the response characteristics based on the design parameters of the transmission component to obtain the equivalent response parameters.

[0017] Optionally, before the simulation model modeling of the electric drive assembly transmission system, the method further includes:

[0018] rotational inertia segmentation of a rotating component in the electric drive assembly transmission system to obtain multiple equivalent inertias;

[0019] coupling connection of the multiple equivalent inertias to obtain a rotating simplified component corresponding to the rotating component;

[0020] Correspondingly, the simulation modeling of the electric drive assembly transmission system according to the equivalent response parameters comprises:

[0021] The simulation modeling of the electric drive assembly transmission system according to the equivalent response parameters and the rotating simplified component comprises obtaining the transmission system model.

[0022] Optionally, the rotating component comprises a transmission shaft, and the rotating simplified component comprises a simplified shaft corresponding to the transmission shaft; the simplified shaft is obtained by:

[0023] According to the transmission relationship of the transmission shaft, the transmission joint of the transmission shaft is simplified in inertia, to obtain a plurality of equivalent inertias corresponding to the transmission shaft;

[0024] The plurality of equivalent inertias corresponding to the transmission shaft are coupled by an elastic unit, to obtain the simplified shaft corresponding to the transmission shaft.

[0025] Optionally, the rotating component comprises a transmission rotor, and the rotating simplified component comprises a simplified rotor corresponding to the transmission rotor; the simplified rotor is obtained by:

[0026] According to the number of inclined pole segments of the transmission rotor, the transmission rotor is divided in inertia, to obtain a plurality of equivalent inertias corresponding to the transmission rotor;

[0027] The plurality of equivalent inertias corresponding to the transmission rotor are coupled by an elastic unit, to obtain the simplified rotor corresponding to the transmission rotor.

[0028] Optionally, the knock simulation analysis result is obtained by:

[0029] The standard working condition of the transmission system model is set, and the electric drive assembly transmission system is simulated under the standard working condition, to obtain the working condition performance of the electric drive assembly transmission system.

[0030] According to the working condition performance, power analysis is performed, to obtain power fluctuation data of the electric drive assembly transmission system; according to the power fluctuation data, knock analysis is performed, to obtain the knock simulation analysis result.

[0031] Optionally, the working condition performance comprises the angular velocity of a component of the electric drive assembly transmission system; the power analysis according to the working condition performance comprises:

[0032] According to the angular velocity of the component of the electric drive assembly transmission system, kinetic energy is calculated, to obtain total kinetic energy data of the electric drive assembly transmission system.

[0033] performing instantaneous change analysis on the total kinetic energy data to obtain the power fluctuation data.

[0034] In a second aspect, the embodiments of the present application provide a device for simulating dynamics knock of an electric drive assembly, applied to an electric drive assembly transmission system; the device comprises:

[0035] a component equivalent module, configured to perform transmission equivalence on a transmission component in the electric drive assembly transmission system to obtain an equivalent component model of the transmission component;

[0036] a parameter calculation module, configured to perform response characteristic analysis on the equivalent component model, and perform equivalent conversion according to the response characteristic of the equivalent component model to determine equivalent response parameters of the transmission component;

[0037] a system modeling module, configured to model a simulation model of the electric drive assembly transmission system according to the equivalent response parameters to obtain a transmission system model;

[0038] a simulation and emulation module, configured to perform knock simulation and emulation according to the transmission system model to obtain a knock simulation and emulation result, which is used to analyze a knock condition in the electric drive assembly transmission system.

[0039] In a third aspect, the embodiments of the present application provide a computer device, comprising a memory and a processor, which are communicatively connected with each other, and the memory stores computer instructions, and the processor executes the computer instructions to perform the method in any of the above embodiments.

[0040] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make a computer execute the method in any of the above embodiments.

[0041] In a fifth aspect, the embodiments of the present application provide a computer program product, comprising computer instructions, and the computer instructions are used to make a computer execute the method in any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0043] Figure 1A step diagram of the electric drive assembly dynamics knock simulation method provided by the embodiment of the present application;

[0044] Figure 2 A step diagram of the transmission equivalence in the embodiment of the present application;

[0045] Figure 3 A step diagram of the equivalent response parameter determination in the embodiment of the present application;

[0046] Figure 4 A step diagram of the rotation simplification of the rotating component in the embodiment of the present application;

[0047] Figure 5 A step diagram of the simplified rotating shaft in the embodiment of the present application;

[0048] Figure 6 A step diagram of the simplified rotating shaft in the embodiment of the present application;

[0049] Figure 7 A schematic diagram of the transmission system model in the embodiment of the present application;

[0050] Figure 8 A step diagram of the knock simulation in the embodiment of the present application;

[0051] Figure 9 A step diagram of the power analysis in the embodiment of the present application;

[0052] Figure 10 A schematic diagram of the knock simulation analysis result in the embodiment of the present application;

[0053] Figure 11 A module diagram of the electric drive assembly dynamics knock simulation device provided by the embodiment of the present application;

[0054] Figure 12 A structural schematic diagram of a computer device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] The electric drive assembly transmission system is a system for transmitting power of an electric motor to a driving wheel or other mechanical structure of a vehicle, including the electric motor and a plurality of transmission components, and a meshing pair is formed between the transmission components. When torque switching occurs, the actual contact surface between each meshing pair also switches, and the side clearance between the transmission components causes relative displacement between the driving side and the driven side in the meshing pair, and knocking noise is generated at the moment when the actual contact surface switching is completed. In order to improve the experience of the user during driving the vehicle, it is necessary to locate the cause of the noise and make corresponding improvement design. In the related art of analyzing the knocking condition of the electric drive assembly transmission system, the comprehensiveness of the analysis of the transmission components still needs to be improved.

[0057] Based on the above problems, the electric drive assembly dynamics knocking simulation method, device and equipment provided by the application are applied to the electric drive assembly transmission system; the transmission components in the electric drive assembly transmission system are transmission equivalent to obtain an equivalent component model of the transmission components; the response characteristics of the equivalent component model are analyzed, and the equivalent response parameters of the transmission components are determined according to the response characteristics of the equivalent component model; a simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameters to obtain a transmission system model; and knocking simulation is performed according to the transmission system model to obtain a knocking simulation analysis result, which is used to analyze the knocking condition in the electric drive assembly transmission system.

[0058] The electric drive assembly dynamics knocking simulation method provided by the application equivalently analyzes the transmission components in the electric drive assembly transmission system according to the transmission characteristics of the transmission components to obtain an equivalent component model including a plurality of equivalent components, and the equivalent response parameters of the corresponding transmission components are obtained by analyzing the response characteristics of the equivalent components. The transmission system model is constructed according to the equivalent response parameters, and knocking simulation is performed to obtain a knocking simulation analysis result.

[0059] Compared with the related art, the transmission components are equivalently analyzed to obtain the equivalent component model, so that the equivalent response parameters of the transmission components can be determined according to the response characteristics of the equivalent component model. On this basis, the equivalent response parameters of the transmission components are used as the data basis for modeling the simulation model, and the transmission components are specifically modeled, so that the corresponding transmission components can be specifically analyzed in the knocking simulation, the comprehensiveness of the knocking condition analysis is effectively improved, and the accuracy of the knocking simulation analysis result is improved.

[0060] The electric drive assembly dynamics knocking simulation method provided in the specification can be applied to simulate the electric drive assembly transmission system of a vehicle during the design process of the vehicle to determine whether there is knocking noise in the electric drive assembly transmission system. The electric drive assembly transmission system includes various transmission components, including but not limited to gears, bevel gears, and spline components. It can be understood that, after adaptive modification, the electric drive assembly dynamics knocking simulation method provided in the specification can also be applied to simulate other systems containing similar parts.

[0061] According to the embodiments of the present application, an electric drive assembly dynamics knocking simulation method embodiment is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0062] Referring to Figure 1 In the present embodiment, an electric drive assembly dynamics knocking simulation method is provided, which is applied to an electric drive assembly transmission system. The method comprises:

[0063] S100. Transmission components in the electric drive assembly transmission system are subjected to transmission equivalence to obtain an equivalent component model of the transmission components.

[0064] S200. Response characteristic analysis is performed on the equivalent component model, and equivalent conversion is performed according to the response characteristics of the equivalent component model to determine the equivalent response parameters of the transmission components.

[0065] S300. A simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameters to obtain a transmission system model.

[0066] S400. Knocking simulation is performed according to the transmission system model to obtain knocking simulation analysis results for analyzing the knocking condition in the electric drive assembly transmission system.

[0067] Specifically, the transmission components in the electric drive assembly transmission system can be spline components and other components for transmitting torque. The above transmission components need to be specifically modeled during simulation. Taking spline as an example, in conventional simulation, the simulation modeling of spline usually depends on simulation software, and users can directly call the preset spline model and parameter settings in the simulation software to model the spline. In these cases, the analysis results output by simulation can only cover the basic stress or load distribution of spline engagement, and cannot simulate various complex factors affecting the operation of spline, making it difficult to simulate the real working state of spline under complex working conditions, resulting in a large deviation between the simulation results and the actual situation.

[0068] In view of the above reasons, in the process of knock simulation analysis on the electric drive assembly transmission system, the transmission components in the electric drive assembly transmission system are first subjected to transmission equivalence. The transmission components are equivalently represented by equivalent components having similar transmission modes and properties, so as to convert the simulation process of the transmission components into the simulation process of the equivalent components, thereby effectively reducing the complexity of the simulation process.

[0069] Further, in order to specifically model the transmission components and comprehensively analyze all components in the electric drive assembly transmission system, a plurality of setting parameters of the transmission components need to be determined before modeling the transmission components, including but not limited to response parameters of the transmission components, which can be mesh stiffness and the like. After obtaining the equivalent component model of the transmission components according to the equivalent components, the response characteristics of the equivalent component model are determined. It can be understood that the response characteristics of the equivalent component model are similar to the response characteristics of the transmission components, and the response characteristics of the transmission components can be approximately determined by equivalent conversion of the response characteristics of the equivalent component model, so as to determine the equivalent response parameters of the transmission components.

[0070] Further, after obtaining the equivalent response parameters of the transmission components, the electric drive assembly transmission system is modeled based on the equivalent response parameters to obtain a transmission system model. It should be noted that the transmission system model at least includes a component model corresponding to the transmission component, and the parameters of the component model are determined according to the equivalent response parameters. It can be understood that, compared with the preset transmission model parameters in the simulation software, the equivalent response parameters determined by the equivalent component model are closer to the actual situation of the transmission components, so as to obtain a transmission system model that is more consistent with the actual electric drive assembly transmission system, thereby accurately reflecting the working state of the electric drive assembly transmission system under actual conditions and improving the simulation effect of the knock simulation analysis.

[0071] Further, after obtaining the transmission system model, the working state of the transmission system model under the set working condition is simulated, and whether knock noise or the like occurs in the transmission system model during the simulation process is detected and analyzed to obtain a knock simulation analysis result. It can be understood that the knock simulation analysis result indicates whether knock noise occurs in the electric drive assembly transmission system under the set working condition and the severity of the knock noise. In the design process, the knock simulation analysis result can be used to analyze and locate the design defects in the electric drive assembly transmission system, so as to improve the working performance and reliability of the electric drive assembly transmission system, thereby improving the driving experience of the user when driving a vehicle containing the electric drive assembly transmission system.

[0072] The electric drive assembly dynamics knocking simulation method provided by the embodiment can equivalently analyze the transmission components in the electric drive assembly transmission system according to the transmission characteristics of the transmission components, obtain an equivalent component model containing multiple equivalent components, and analyze the response characteristics of the equivalent components to obtain equivalent response parameters of the corresponding transmission components; and a transmission system model is constructed according to the equivalent response parameters, so as to be used for knocking simulation and analysis to obtain knocking simulation analysis results.

[0073] Compared with the related art, the transmission components are equivalently analyzed to be equivalent component models, so that the equivalent response parameters of the transmission components can be determined according to the response characteristics of the equivalent component models. On this basis, the equivalent response parameters of the transmission components are used as the data basis for modeling of the simulation model, and the transmission components are specifically modeled, so that the corresponding transmission components can be specifically analyzed in the knocking simulation and analysis, the comprehensiveness of the knocking analysis is effectively improved, and the accuracy of the knocking simulation analysis results is improved.

[0074] Referring to Figure 2 As shown in the figure, as an embodiment of the present application, the equivalent component model includes equivalent components corresponding to the transmission components; the transmission components in the electric drive assembly transmission system are equivalently analyzed to obtain the equivalent component model of the transmission components, including:

[0075] S110. The equivalent number and geometric parameters of the equivalent components are determined according to the design parameters of the transmission components.

[0076] S120. The equivalent component model is obtained by performing finite element modeling on the equivalent components according to the equivalent number and geometric parameters.

[0077] Specifically, the equivalent components have similar transmission modes and properties with the transmission components. First, the component type of the equivalent components corresponding to the transmission components is determined according to the component type of the transmission components, and the design parameters of the transmission components are equivalently applied to determine the equivalent number of the equivalent components capable of equivalently representing the transmission components and the geometric parameters of each equivalent component, so as to determine the relative relationship and component layout of the equivalent components.

[0078] Exemplarily, in the case where the transmission component is a spline, the corresponding equivalent component can be multiple gear sub-modules, the different gear sub-modules have meshing relationships, form multiple meshing pairs, and the adjacent meshing pairs are in meshing contact to form a continuous torque transmission structure. The design parameters of the spline can include the number of teeth, the pitch circle diameter, the pressure angle, the backlash or the helix angle, etc. The number of gear sub-modules can be determined according to the number of teeth of the spline, and the geometric parameters of the gear sub-modules are determined according to the design parameters of the spline. It should be noted that the geometric parameters of each gear sub-module are the same, so as to equivalently analyze the spline as an equivalent structure composed of multiple identical gear sub-modules.

[0079] Further, the equivalent components are modeled by finite elements according to the component type, equivalent number and geometric parameters of the equivalent components, to obtain an equivalent component model containing the equivalent components. It can be understood that the equivalent component model is an equivalent representation of the finite element model of the transmission component, and the corresponding parameters of the transmission component can be determined by performing finite element simulation on the equivalent component model.

[0080] Referring to Figure 3 As shown in FIG. 8, as an embodiment of the present application, the response characteristics analysis is performed on the equivalent component model, and the equivalent response parameters of the transmission component are determined by equivalent conversion according to the response characteristics of the equivalent component model, including:

[0081] S210. The response analysis is performed on the equivalent component model to obtain the response characteristics between the equivalent components in the equivalent component model.

[0082] S220. The response characteristics are converted by coincidence degree according to the design parameters of the transmission component to obtain the equivalent response parameters.

[0083] Specifically, the finite element simulation is performed on the equivalent component model, the response characteristics of the equivalent component model under the simulation working condition are analyzed, and the response characteristics between the equivalent components are obtained. It should be noted that the response characteristics can be the reaction behavior of the equivalent component under the external excitation such as the load, applied force and deformation of the adjacent equivalent component under the simulation working condition, which represents the resistance of the equivalent component to the external excitation. In the case where the response parameters of the transmission component are difficult to be directly determined, the response analysis is performed on the equivalent component model, so that the response parameters of the transmission component can be equivalently represented by the response characteristics between the equivalent components, which not only simplifies the process of the knock simulation and analysis of the electric drive assembly transmission system, but also improves the comprehensiveness of the knock situation analysis by modeling and analyzing the transmission component according to the equivalent response parameters.

[0084] Further, the coincidence degree of the equivalent components is determined based on the design parameters of the transmission component, which is used for the coincidence degree conversion of the response characteristics to obtain the equivalent response parameters. It can be understood that since the equivalent component model contains multiple equivalent components, the response characteristics exist between the adjacent equivalent components, and for the equivalent component model as a whole, the response characteristics are related to the response characteristics and coincidence degree between all the equivalent components. In the case of higher coincidence degree, the response characteristics between the equivalent components can be more directly reflected to the overall structure of the equivalent component model, so that the response parameters of the equivalent component model change. By converting the response characteristics of the equivalent components by the coincidence degree, the response parameters of the equivalent component model can be accurately determined, so as to obtain the equivalent response parameters of the transmission component for modeling the transmission model.

[0085] Exemplarily, in the case that the transmission component is a spline and the equivalent component model is an equivalent structure composed of a plurality of same gear sub-modules in parallel engagement, the equivalent response parameter of the transmission component can be an equivalent engagement stiffness of the spline. Finite element simulation is performed on each pair of mutually engaged gear sub-modules to determine the single-tooth engagement stiffness of each engagement pair. In some embodiments, the single-tooth engagement stiffness of the engagement pair can be obtained by: obtaining the single-tooth stiffness of the driving gear and the driven gear in the engagement pair through finite element simulation, denoted as driving stiffness and driven stiffness; and performing parallel connection of the driving stiffness and the driven stiffness to obtain the parallel value of the two, as the single-tooth engagement stiffness of the engagement pair.

[0086] Further, the equivalent overlap of the spline is determined according to the design parameters of the spline to represent the overlap between the gear sub-modules. In an ideal case, each tooth of the spline can be uniformly engaged, and in this case, the equivalent overlap of the spline can be represented by the number of teeth of the spline. In actual cases, actual errors such as pitch error and side error of the spline need to be considered, and in this case, the equivalent overlap of the spline can be obtained according to historical test reports or detection. The single-tooth engagement stiffness between the gear sub-modules is multiplied by the equivalent overlap of the spline to obtain the equivalent engagement stiffness of the spline.

[0087] Referring to Figure 4 As shown in FIG. 1, as an embodiment of the present application, before modeling the simulation model of the electric drive assembly transmission system, the method further comprises:

[0088] S230. Dividing the rotational inertia of the rotating component in the electric drive assembly transmission system to obtain a plurality of equivalent inertias.

[0089] S240. Coupling the plurality of equivalent inertias to obtain a rotating simplified component corresponding to the rotating component.

[0090] Correspondingly, the simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameter to obtain a transmission system model, comprising:

[0091] S310. Modeling the simulation model of the electric drive assembly transmission system according to the equivalent response parameter and the rotating simplified component to obtain a transmission system model.

[0092] Specifically, part of the rotating components in the electric drive assembly transmission system does not directly generate knocking noise, but these rotating components are usually used to transmit torque to the transmission component, and there is an indirect relationship between the transmission relationship and the generation of knocking noise. Therefore, when simulating the knocking of the electric drive assembly transmission system, these rotating components can be simplified as rotational inertia and torsional stiffness, which can effectively reflect the torsional characteristics of the rotating components while simplifying the transmission system model, so as to be able to simulate the knocking of the electric drive assembly transmission system more finely.

[0093] For the rotating component, the total moment of inertia is obtained by integrating the moment of inertia of each part of the component. Therefore, when simulating the torsional characteristics of the rotating component, the rotating component can be divided into multiple equivalent inertia according to the connection relationship and transmission relationship of the rotating component and other components. On this basis, the obtained multiple equivalent inertia is coupled and connected through the spring unit to obtain the rotating simplified component corresponding to the rotating component. It can be understood that the equivalent inertia contains the moment of inertia information of the rotating component, and the spring unit includes the torsional stiffness and damping information of the rotating component. By simplifying the rotating component into a rotating simplified component, the influence of the torsional mode of the rotating component on the knocking simulation analysis result can be reflected in the knocking simulation simulation process, the precision of the knocking simulation simulation is improved, and the accuracy of the knocking simulation analysis result is improved.

[0094] Further, on the basis of obtaining the rotating simplified component, one-dimensional modeling of the rotating component is performed according to the simplified form of each rotating simplified component, and the transmission component is modeled according to the equivalent response parameters of the transmission component, so as to perform simulation modeling according to the modeling results of the two, and obtain the transmission system model.

[0095] It should be noted that when the knocking simulation simulation of the electric drive assembly transmission system is performed, in addition to the transmission component described above, the gap component having a gap in the rotating direction and the long shaft component need to be modeled in detail, and the gap component can be a potential sound source of knocking noise. When the shaft component is long, it often has low stiffness, which can easily cause large deformation and vibration of the shaft component during operation, and further cause collision with other components in the electric drive assembly transmission system, thereby generating knocking noise. Therefore, in this embodiment, the related components that can cause knocking noise are modeled in detail to effectively determine the knocking noise condition of the electric drive assembly transmission system.

[0096] Referring to Figure 5 As shown in FIG. 1, as an embodiment of the present application, the rotating component includes a transmission shaft, and the rotating simplified component includes a simplified shaft corresponding to the transmission shaft; the simplified shaft is obtained by the following method:

[0097] S232. According to the transmission relationship of the transmission shaft, the transmission joint of the transmission shaft is simplified in inertia, and multiple equivalent inertia corresponding to the transmission shaft is obtained.

[0098] S242. The multiple equivalent inertia corresponding to the transmission shaft is coupled and connected through the elastic unit, and the simplified shaft corresponding to the transmission shaft is obtained.

[0099] Specifically, actual moment of inertia of the transmission rotating shaft is analyzed according to the rotating relationship of the transmission rotating shaft, and the transmission rotating shaft is simplified in inertia equivalence according to the actual moment of inertia of the transmission rotating shaft, to obtain a plurality of equivalent inertia corresponding to the transmission rotating shaft. In some embodiments, the transmission rotating shaft can be simplified into two equivalent inertias located at two ends of the transmission rotating shaft.

[0100] Further, adjacent equivalent inertias in the plurality of equivalent inertias are coupled and connected by an elastic unit, to obtain a simplified rotating shaft corresponding to the transmission rotating shaft. It can be understood that the elastic unit can be a spring unit, which contains torsional stiffness and damping information of the transmission rotating shaft, which can be obtained based on measured results of rotating shaft modal or frequency response test results of the transmission rotating shaft.

[0101] It should be noted that the structure of the simplified rotating shaft contains all the dynamic characteristics of the first-order torsional mode, and can represent the first-order torsional mode of the transmission rotating shaft, so that the influence of the first-order torsional mode of the transmission rotating shaft on the knock simulation analysis result can be considered in the knock simulation simulation, and the accuracy of the knock simulation analysis result is improved.

[0102] Referring to Figure 6 As an embodiment of the present application, the rotating component includes a transmission rotor, and the rotating simplified component includes a simplified rotor corresponding to the transmission rotor; the simplified rotor is obtained by the following way:

[0103] S234. The transmission rotor is divided in inertia according to the number of inclined poles of the transmission rotor, to obtain a plurality of equivalent inertias corresponding to the transmission rotor.

[0104] S244. The plurality of equivalent inertias corresponding to the transmission rotor are coupled and connected by an elastic unit, to obtain a simplified rotor corresponding to the transmission rotor.

[0105] Specifically, the transmission rotor can be a rotor of a motor in an electric drive assembly transmission system, and the transmission rotor can include a plurality of inclined poles to optimize its own and the motor working performance. In actual situation, the torsional stiffness between the inclined poles in the transmission rotor is less than the torsional stiffness corresponding to the material of the transmission rotor, resulting in that the actual torsional stiffness of the transmission rotor is less than the torsional stiffness obtained by simulating the transmission rotor according to the material. Therefore, if the transmission rotor is directly regarded as a whole, the torsional stiffness of the transmission rotor does not conform to the actual situation, which affects the accuracy of the knock simulation analysis result.

[0106] In view of the above reasons, the embodiment divides the inertia of the transmission rotor according to the number of the inclined pole segments, to obtain a plurality of equivalent inertias corresponding to the number of the inclined pole segments. On this basis, the adjacent equivalent inertias are coupled by elastic units to obtain a simplified rotor corresponding to the transmission rotor. It can be understood that the elastic units can be spring units for simulating the torsional stiffness and damping of the transmission rotor, so as to accurately simulate the torsional characteristics of the transmission rotor, and the torsional stiffness and damping of the transmission rotor can be obtained according to the actual test results of the modal or frequency response test of the transmission rotor.

[0107] In some embodiments, the simulation model of the electric drive assembly transmission system is modeled based on the equivalent response parameters and the simplified rotating components, and the obtained transmission system model is as shown in Figure 7 In the embodiment, the electric drive assembly transmission system is a conventional electric drive including a two-stage reducer, which includes a motor rotor, an input spline, an input gear pair, an output gear pair, a differential bevel gear, an output spline and a vehicle inertia, etc. The motor rotor is connected to one end of the input spline, the other end of the input spline is connected to one end of the input gear pair, the other end of the input gear pair is connected to one end of the output gear pair, the other end of the output gear pair is connected to the input end of the differential bevel gear, and the output end of the differential bevel gear is connected to the two output splines. Among them, the motor rotor is divided into 6 equivalent inertias according to the number of the inclined pole segments, and the adjacent equivalent inertias are connected by spring units. The input spline and the output spline are equivalent to gear sub-models, and the parameters of the equivalent gear sub-models are set according to the respective design parameters, wherein the inertia of the driven wheel of the output spline sub-model is half of the vehicle inertia. The input shaft and the intermediate shaft in the electric drive assembly transmission system are simplified into equivalent inertias at both ends of the rotating shaft and connected spring units, and the equivalent inertia on one end of the input shaft is included in the driven wheel inertia of the input spline sub-model, and the equivalent inertia on one end of the intermediate shaft is included in the driven wheel inertia of the input gear pair. The subsequent transmission system of the vehicle connected to the electric drive assembly transmission system is modeled in the same way as the electric drive assembly transmission system.

[0108] Referring to Figure 8 As an embodiment of the present application, the knock simulation analysis result is obtained by simulating the transmission system model, including:

[0109] S410. The standard working condition of the transmission system model is set, and the electric drive assembly transmission system is simulated under the standard working condition to obtain the working condition performance of the electric drive assembly transmission system.

[0110] S420. The power analysis is performed according to the working condition performance to obtain the power fluctuation data of the electric drive assembly transmission system; and the knock analysis is performed according to the power fluctuation data to obtain the knock simulation analysis result.

[0111] Specifically, in order to be able to compare the knocking conditions of different electric drive assembly transmission systems in the design stage, the same standard working condition is designed for multiple electric drive assembly transmission systems in the knocking simulation, so that simulation can be performed in the stage when the design input is not completely clear, and the working condition performance of multiple electric drive assembly transmission systems under the same working condition can be compared. In some embodiments, the input speed and output torque are first set in the standard working condition; secondly, the corresponding output speed is calculated according to the input speed and the transmission ratio of the transmission gear, and the corresponding input torque is calculated according to the output torque and the transmission ratio of the transmission gear; finally, the standard working condition is determined according to the input speed, the output speed, the input torque, the output torque and the calculation time. Exemplarily, the input speed can be 1000 rpm, the output torque can be 100 Nm, and the calculation time can be 0.1 s. The standard working condition can also be designed for a certain type of working condition, for example, the Tip in / Tip out working condition simulating the vehicle stepping on the accelerator-pushing off-stepping on the accelerator-pushing off.

[0112] Further, the electric drive assembly transmission system is simulated under the standard working condition to obtain the working condition performance of the electric drive assembly transmission system. The working condition performance of the electric drive assembly transmission system includes system power, which is usually a constant value or in a slow change state under smooth working conditions such as uniform speed or uniform variable speed. When knocking occurs in the electric drive assembly transmission system, the system power will change dramatically in a short time. Therefore, the knocking condition in the electric drive assembly transmission system can be analyzed according to the power fluctuation data to determine the occurrence time and severity of the knocking noise. It can be understood that the way of analyzing the knocking condition by using the power fluctuation data also conforms to the actual perception of the user, so that after targeted improvement according to the design defects, the user can significantly reduce or even eliminate the knocking noise, effectively improving the driving experience of the user when driving the vehicle containing the electric drive assembly transmission system.

[0113] Referring to Figure 9 As an embodiment of the present application, the working condition performance includes the angular velocity of the components of the electric drive assembly transmission system; the power fluctuation data of the electric drive assembly transmission system is obtained by power analysis according to the working condition performance, including:

[0114] S422. The total kinetic energy data of the electric drive assembly transmission system is obtained by kinetic energy calculation according to the angular velocity of the components of the electric drive assembly transmission system.

[0115] S424. The power fluctuation data is obtained by instantaneous change analysis of the total kinetic energy data.

[0116] Specifically, to calculate the power fluctuation data, the angular velocity of each component in the electric drive assembly transmission system is extracted from the working condition performance of the electric drive assembly transmission system, and the kinetic energy of the electric drive assembly transmission system is calculated according to the angular velocity of the component, to determine the total kinetic energy data of the electric drive assembly transmission system.

[0117] It can be understood that the total kinetic energy data of the electric drive assembly transmission system can be expressed as a kinetic energy curve that changes over time. The time derivative of the kinetic energy curve is obtained, and the instantaneous power data of the electric drive assembly transmission system is obtained, and the fluctuation calculation of the instantaneous power data is performed, to determine the fluctuation value of the instantaneous power data at each time, and then the power fluctuation data is obtained.

[0118] Referring to Figure 10 , it is shown that Figure 10 the power fluctuation data obtained by the knock simulation simulation of the transmission system model shown in Figure 7 under the standard working condition. It can be seen that the transmission system model appears instantaneous power fluctuation between 0.59s and 0.6s and around 0.63s, and the instantaneous power fluctuation between 0.59s and 0.6s is more severe. It can be considered that knock noise occurs at both time points, and the knock noise occurring between 0.59s and 0.6s is more serious than the knock noise occurring around 0.63s. According to the above analysis result, the designer can identify the risk and locate the defect of the electric drive assembly transmission system based on the knock simulation simulation process, so as to further optimize the design of the electric drive assembly transmission system and improve the working performance of the electric drive assembly transmission system.

[0119] Correspondingly, please refer to Figure 11 , the embodiment of the application provides an electric drive assembly dynamics knock simulation device, which is applied to an electric drive assembly transmission system; the device comprises:

[0120] The component equivalent module 1110 is configured to perform transmission equivalence on the transmission components in the electric drive assembly transmission system, to obtain an equivalent component model of the transmission components.

[0121] The parameter calculation module 1120 is configured to analyze the response characteristics of the equivalent component model, and perform equivalent conversion according to the response characteristics of the equivalent component model, to determine equivalent response parameters of the transmission components.

[0122] The system modeling module 1130 is configured to model the electric drive assembly transmission system according to the equivalent response parameters, to obtain a transmission system model.

[0123] The simulation simulation module 1140 is configured to perform knock simulation simulation according to the transmission system model, to obtain a knock simulation analysis result, which is used to analyze the knocking condition in the electric drive assembly transmission system.

[0124] In some optional embodiments, the component equivalent module 1110 comprises:

[0125] An equivalent application unit is configured to perform equivalent application according to the design parameters of the transmission component, and determine equivalent quantities and geometric parameters of the equivalent components.

[0126] A finite element modeling unit is configured to perform finite element modeling on the equivalent components according to the equivalent quantities and geometric parameters, and obtain an equivalent component model.

[0127] In some optional embodiments, the parameter calculation module 1120 comprises:

[0128] A transmission analysis unit is configured to perform response analysis on the equivalent component model, and obtain response characteristics between the equivalent components in the equivalent component model.

[0129] A coincidence conversion unit is configured to perform coincidence conversion on the response characteristics based on the design parameters of the transmission component, and obtain equivalent response parameters.

[0130] In some optional embodiments, the parameter calculation module 1120 further comprises:

[0131] An inertia segmentation unit is configured to perform rotational inertia segmentation on the rotating components in the electric drive assembly transmission system, and obtain multi-segment equivalent inertias.

[0132] A coupling connection unit is configured to perform coupling connection on the multi-segment equivalent inertias, and obtain a rotating simplified component corresponding to the rotating components.

[0133] Correspondingly, the system modeling module 1130 comprises:

[0134] A simplified modeling unit is configured to perform simulation model modeling on the electric drive assembly transmission system according to the equivalent response parameters and the rotating simplified component, and obtain a transmission system model.

[0135] In some optional embodiments, the parameter calculation module 1120 further comprises:

[0136] A shaft equivalent simplified sub-unit is configured to perform inertia equivalent simplification on the transmission joint of the transmission shaft according to the transmission relationship of the transmission shaft, and obtain multi-segment equivalent inertias corresponding to the transmission shaft.

[0137] A shaft coupling connection sub-unit is configured to perform coupling connection on the multi-segment equivalent inertias corresponding to the transmission shaft through an elastic unit, and obtain a simplified shaft corresponding to the transmission shaft.

[0138] In some optional embodiments, the parameter calculation module 1120 further comprises:

[0139] The rotor equivalent simplification subunit is used for dividing the inertia of the transmission rotor according to the number of inclined pole segments of the transmission rotor, so as to obtain the corresponding multi-segment equivalent inertia of the transmission rotor.

[0140] The rotor coupling connection subunit is used for coupling and connecting the corresponding multi-segment equivalent inertia of the transmission rotor through the elastic unit, so as to obtain the corresponding simplified rotor of the transmission rotor.

[0141] In some optional embodiments, the simulation module 1140 comprises:

[0142] The working condition setting unit is configured to set a standard working condition for the transmission system model, and simulate and analyze the electric drive assembly transmission system under the standard working condition to obtain the working condition performance of the electric drive assembly transmission system.

[0143] The power analysis unit is configured to perform power analysis according to the working condition performance to obtain power fluctuation data of the electric drive assembly transmission system, and perform knock analysis according to the power fluctuation data to obtain knock simulation analysis results.

[0144] In some optional embodiments, the power analysis unit comprises:

[0145] The kinetic energy calculation subunit is configured to calculate the kinetic energy of the electric drive assembly transmission system according to the angular velocity of the parts of the electric drive assembly transmission system to obtain total kinetic energy data of the electric drive assembly transmission system.

[0146] The change analysis subunit is configured to perform instantaneous change analysis on the total kinetic energy data to obtain the power fluctuation data.

[0147] The further function description of each module and unit described above is the same as that of the corresponding embodiments described above, and will not be repeated here.

[0148] The electric drive assembly dynamics knock simulation device in the embodiment is presented in the form of a functional unit. The unit herein refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory executing one or more software or fixed programs, and / or other devices that can provide the above functions.

[0149] Please refer to Figure 12 , Figure 12is a structural schematic diagram of a computer device provided by an embodiment of the present application. As shown in the figure, the computer device comprises one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are communicatively connected to each other by different buses, and can be installed on a common mainboard or in other manners as needed. The processor can process instructions executed in the computer device, including instructions stored in the memory or on the memory to display graphical information of a GUI on an external input / output device such as a display device coupled to the interface. In some optional embodiments, multiple processors and / or multiple buses can be used together with multiple memories and multiple memory banks, if needed. Also, multiple computer devices can be connected, each providing part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 12 The processor 10 is taken as an example in the embodiment.

[0150] The processor 10 can be a central processor, a network processor, or a combination thereof. The processor 10 can further include a hardware chip. The hardware chip can be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device can be a complex programmable logic device, a field programmable logic device, a general array logic, or any combination thereof.

[0151] The memory 20 stores instructions executable by the at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0152] The memory 20 can include a program storage area and a data storage area. The program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the computer device, and the like. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some optional embodiments, the memory 20 can optionally include a memory remotely arranged with respect to the processor 10, which can be connected to the computer device through a network. Examples of the network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0153] The memory 20 can include a volatile memory, such as a random access memory; the memory can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid state disk; and the memory 20 can further include a combination of the above kinds of memories.

[0154] The computer device also includes a communication interface 30 for the computer device to communicate with other devices or communication networks.

[0155] The embodiments of the present application further provide a computer readable storage medium, and the method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or be implemented as computer code originally stored in a remote storage medium or non-transitory machine readable storage medium and downloaded to a local storage medium to be stored, so that the method described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can also include a combination of the above-mentioned memories. It can be understood that the computer, the processor, the microprocessor controller, or the programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0156] The embodiments of the present application provide a computer program product, which includes computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method of any of the embodiments of the present application.

[0157] Although the embodiments of the present application are described with reference to the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

[0158] The system, device, module or unit illustrated in the above embodiments can be specifically implemented by a computer chip or entity, or by a product with certain function. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0159] For the convenience of description, the above device is described as various units divided by functions. Of course, the functions of each unit can be implemented in the same or more software and / or hardware when implementing the present application.

[0160] Those skilled in the art will appreciate that embodiments of the application can be readily used as a method, a system or a computer program product. Accordingly, the application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer-readable program code.

[0161] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0162] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0163] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0164] It should also be noted that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. In the context of the specification, the term "and / or" means "and" or "or", and the term "or" means "and" or "or". In the context of the specification, the term "exemplary" means "example" or "an example of".

[0165] Various embodiments are described herein with reference to the drawings. The same or similar components are denoted by the same or similar reference numerals throughout the drawings. Each embodiment is described in a progressive manner, and the same or similar parts between embodiments are cross-referenced. Each embodiment focuses on the differences from other embodiments. In particular, the system embodiments are described more simply because they are substantially similar to the method embodiments, and the relevant parts are cross-referenced with the parts of the method embodiments.

[0166] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

[0167] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. A method for electric drive assembly dynamics knock simulation, characterized in that, The method is applied to an electric drive assembly transmission system, and comprises the following steps: transmission equivalent is performed on a transmission component in the electric drive assembly transmission system to obtain an equivalent component model of the transmission component; response characteristic analysis is performed on the equivalent component model, and equivalent conversion is performed according to the response characteristic of the equivalent component model to determine equivalent response parameters of the transmission component; a simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameters to obtain a transmission system model; knocking simulation analysis is performed according to the transmission system model to obtain a knocking simulation analysis result, which is used to analyze the knocking condition in the electric drive assembly transmission system.

2. The method of claim 1, wherein, The equivalent component model comprises equivalent components corresponding to the transmission component; the transmission equivalent is performed on the transmission component in the electric drive assembly transmission system to obtain the equivalent component model of the transmission component, which comprises the following steps: equivalent application is performed according to the design parameters of the transmission component to determine equivalent quantities and geometric parameters of the equivalent components; finite element modeling is performed on the equivalent components according to the equivalent quantities and the geometric parameters to obtain the equivalent component model.

3. The method of claim 1, wherein, The response characteristic analysis is performed on the equivalent component model, and the equivalent conversion is performed according to the response characteristic of the equivalent component model to determine the equivalent response parameters of the transmission component, which comprises the following steps: response analysis is performed on the equivalent component model to obtain the response characteristic between each equivalent component in the equivalent component model; the response characteristic is converted according to the design parameters of the transmission component to obtain the equivalent response parameters.

4. The method of claim 1, wherein, Before the simulation model of the electric drive assembly transmission system is modeled, the method further comprises the following steps: rotational inertia segmentation is performed on a rotating component in the electric drive assembly transmission system to obtain a plurality of equivalent inertias; the plurality of equivalent inertias are coupled to obtain a rotating simplified component corresponding to the rotating component; Accordingly, the simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameters to obtain the transmission system model, which comprises the following steps: the simulation model of the electric drive assembly transmission system is modeled according to the equivalent response parameters and the rotating simplified component to obtain the transmission system model.

5. The method of claim 4, wherein, The rotating component comprises a transmission shaft, and the rotating simplified component comprises a simplified shaft corresponding to the transmission shaft; the simplified shaft is obtained in the following manner: inertia equivalent simplification is performed on a transmission joint of the transmission shaft according to the transmission relationship of the transmission shaft to obtain a plurality of equivalent inertias corresponding to the transmission shaft; the plurality of equivalent inertias corresponding to the transmission shaft are coupled through an elastic unit to obtain the simplified shaft corresponding to the transmission shaft.

6. The method of claim 4, wherein, The rotating component comprises a transmission rotor, and the rotating simplified component comprises a simplified rotor corresponding to the transmission rotor; the simplified rotor is obtained in the following manner: inertia segmentation is performed on the transmission rotor according to the number of inclined pole segments of the transmission rotor to obtain a plurality of equivalent inertias corresponding to the transmission rotor; the plurality of equivalent inertias corresponding to the transmission rotor are coupled through an elastic unit to obtain the simplified rotor corresponding to the transmission rotor.

7. The method of claim 1, wherein, The knocking simulation simulation according to the transmission system model obtains a knocking simulation analysis result, including: The transmission system model is set to a standard working condition, and the electric drive assembly transmission system is simulated under the standard working condition to obtain the working condition performance of the electric drive assembly transmission system. According to the working condition performance, power analysis is performed to obtain power fluctuation data of the electric drive assembly transmission system; according to the power fluctuation data, knocking analysis is performed to obtain the knocking simulation analysis result.

8. The method of claim 7, wherein, The working condition performance includes the angular velocity of the components of the electric drive assembly transmission system; the power analysis according to the working condition performance obtains the power fluctuation data of the electric drive assembly transmission system, including: According to the angular velocity of the components of the electric drive assembly transmission system, kinetic energy calculation is performed to obtain total kinetic energy data of the electric drive assembly transmission system; The total kinetic energy data is analyzed for instantaneous change to obtain the power fluctuation data.

9. An electric drive assembly dynamics knock simulation device, characterized by Applied to an electric drive assembly transmission system; the device includes: A component equivalent module for performing transmission equivalence on transmission components in the electric drive assembly transmission system to obtain an equivalent component model of the transmission components; A parameter calculation module for analyzing the response characteristics of the equivalent component model and performing equivalent conversion according to the response characteristics of the equivalent component model to determine the equivalent response parameters of the transmission components; A system modeling module for modeling the electric drive assembly transmission system according to the equivalent response parameters to obtain a transmission system model; A simulation module for performing knocking simulation simulation according to the transmission system model to obtain a knocking simulation analysis result for analyzing the knocking condition in the electric drive assembly transmission system.

10. A computer device, comprising: Including: A memory and a processor, the memory and the processor are connected with each other in communication, the memory stores computer instructions, and the processor executes the computer instructions to perform the method of any one of claims 1 to 8.

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