Simulation analysis method, electronic equipment and computer readable storage medium

Abstract

The invention discloses a simulation analysis method, electronic equipment and a computer readable storage medium. The method is applied to the electric drive controller, and the electric drive controller comprises a shell and an internal device. The method comprises the steps of obtaining a geometric model of the electric drive controller; performing mesh generation on the geometric model to obtain an outer shell mesh and an inner device mesh; determining a connection attribute between the outer shell grid and the internal device grid according to a preset connection relationship between the outer shell and the internal device; wherein each preset connection relationship corresponds to at least one connection attribute; and performing modal simulation analysis on the geometric model after the connection attribute is determined to obtain a modal analysis result of the corresponding electric drive controller. In this way, the accuracy of the modal simulation analysis result of the electric drive controller can be improved.

Description

Technical Field

[0001] The present application relates to the field of simulation, and in particular to a simulation analysis method, an electronic device and a computer-readable storage medium. Background Art

[0002] In the field of electric drive control, when performing modal simulation analysis on an electric drive controller, usually only the controller housing, that is, only the controller cover and the controller case, are modeled. All devices inside the controller are simplified to mass points. Therefore, the modal analysis results obtained can only reflect the modes of the controller cover and the controller case, but not the modes of the devices inside the controller. And because the internal devices are simplified to mass points, it is not possible to accurately restore the connection constraint relationship between the internal devices of the controller or between the devices and the housing, and the obtained modal analysis results are not accurate. Summary of the invention

[0003] The main purpose of this application is to provide a simulation analysis method, an electronic device and a computer-readable storage medium, which can improve the accuracy of the modal simulation analysis results of the electric drive controller.

[0004] In order to solve the above technical problems, the first technical solution adopted by the present application is: to provide a simulation analysis method. The method is applied to an electric drive controller, which includes a shell and an internal device. The method includes obtaining a geometric model of the electric drive controller; meshing the geometric model to obtain a shell body mesh and an internal device body mesh; determining the connection properties between the shell body mesh and the internal device body mesh according to a preset connection relationship between the shell and the internal device; wherein each preset connection relationship corresponds to at least one connection property; and performing modal simulation analysis on the geometric model after the connection properties are determined to obtain a modal analysis result of the corresponding electric drive controller.

[0005] To solve the above technical problem, the second technical solution adopted by the present application is to provide an electronic device, which includes a memory and a processor, wherein the memory is used to store program data, and the program data can be executed by the processor to implement the method described in the first technical solution.

[0006] To solve the above technical problems, the third technical solution adopted by the present application is to provide a computer-readable storage medium. The computer-readable storage medium stores program data and can be executed by a processor to implement the method described in the first technical solution.

[0007] The beneficial effect of the present application is that when the geometric model of the electric drive controller is meshed, the present application generates not only the outer shell mesh but also the internal device body mesh. And the connection property between the outer shell mesh and the internal device body mesh is determined by the preset connection relationship between the outer shell and the internal device, so that the obtained geometric model fully considers the connection constraint relationship between the outer shell and the internal device in the installed state, so that when the modal simulation analysis is performed based on the geometric model with the internal device body mesh and the connection property of the body mesh, not only the modal analysis result of the outer shell can be obtained, but also the modal analysis result of the internal device can be obtained, and the obtained modal analysis result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 is a flow chart of a first embodiment of a simulation analysis method;

[0010] Figure 2 is a flow chart of a second embodiment of a simulation analysis method;

[0011] Figure 3 It is a structural schematic diagram of an electric drive controller;

[0012] Figure 4 It is a structural schematic diagram of an embodiment of the electronic device of the present application;

[0013] Figure 5 It is a structural diagram of an embodiment of a computer-readable storage medium of the present application. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0016] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0017] Reference Figure 1 , Figure 1 This is a flow chart of the first embodiment of the simulation analysis method of the present application.

[0018] The method is applied to an electric drive controller, which includes a housing and internal components. The method includes but is not limited to the following steps.

[0019] S11: Obtain a geometric model of the electric drive controller.

[0020] S12: Mesh the geometric model to obtain an outer shell mesh and an internal device body mesh.

[0021] S13: Determine a connection property between the outer shell body grid and the internal device body grid according to a preset connection relationship between the outer shell and the internal device.

[0022] Each preset connection relationship corresponds to at least one connection attribute.

[0023] S14: performing modal simulation analysis on the geometric model after the connection properties are determined to obtain a modal analysis result of the corresponding electric drive controller.

[0024] In this embodiment, when meshing the geometric model of the electric drive controller, not only the outer shell mesh but also the internal device body mesh is generated. And the connection property between the outer shell mesh and the internal device body mesh is determined by the preset connection relationship between the outer shell and the internal device, so that the obtained geometric model fully considers the connection constraint relationship between the outer shell and the internal device in the installation state, so that when the modal simulation analysis is performed based on the geometric model with the internal device body mesh and the connection property of the body mesh, not only the modal analysis result of the outer shell can be obtained, but also the modal analysis result of the internal device can be obtained, and the obtained modal analysis result is more accurate.

[0025] The housing in the present application may have multiple components, for example, the housing may include a box body and a cover plate, etc. The housing body grid may include multiple housing component body grids, such as a box body grid and a cover plate body grid.

[0026] Reference Figure 2 , Figure 2 This is a flow chart of the second embodiment of the simulation analysis method of the present application. The method includes but is not limited to the following steps.

[0027] S21: Obtain a geometric model of the electric drive controller.

[0028] S22: Mesh the geometric model to obtain an outer shell mesh and an internal device body mesh.

[0029] S23: Determine a connection property between the outer shell body grid and the internal device body grid according to a preset connection relationship between the outer shell and the internal device.

[0030] S24 determines the connection properties between the internal device body grids according to the preset connection relationship between the internal devices.

[0031] Each preset connection relationship corresponds to at least one connection attribute.

[0032] S25: performing modal simulation analysis on the geometric model after the connection properties are determined to obtain a modal analysis result of the corresponding electric drive controller.

[0033] In this embodiment, the connection relationship between the internal devices is further considered, so that the connection properties between the internal device body meshes are set according to the connection relationship between the internal devices, so that the obtained modal analysis results are more accurate.

[0034] In the above embodiments, the preset connection relationship may include at least one of the following: welding connection, precast connection, gluing connection, plug-in connection, and bolt connection.

[0035] The connection attribute may include at least one of the following: a common node connection, a rigid unit connection, and an elastic unit connection.

[0036] In the above embodiment, if the modal analysis results obtained do not meet the preset requirements, the preset connection relationship between the outer shell and the internal components or the preset connection relationship between the internal components can be adjusted, thereby correspondingly adjusting the connection properties between the body meshes, and continuing the modal analysis based on the geometric model with the re-determined connection properties until the modal analysis results can meet the preset requirements.

[0037] In the above embodiment, before performing modal simulation analysis on the geometric model after the connection properties are determined to obtain the modal analysis results of the corresponding electric drive controller, it includes: calibrating parameters of the internal device body grid, and the parameters include at least one of the material elastic modulus and the material density.

[0038] After meshing the internal device to obtain the internal device body mesh, it is necessary to calibrate its parameters. The material elastic modulus can be equivalently calibrated based on the monomer free modal simulation results and the monomer free modal test results. The material density can be equivalently calibrated based on the measured mass. For the control circuit board and the electronic devices mounted on it, they can be simplified to the same material parameters for subsequent calculations.

[0039] In the present application, determining the connection properties between volume meshes includes determining the connection properties between surface meshes corresponding to the volume meshes. The surface mesh is the mesh located on the surface of the structure model in the volume mesh. For example, after the volume meshing of an internal device is performed, the meshes of each volume mesh located on the surface of the internal device are surface meshes.

[0040] In one embodiment, determining the connection properties between volume meshes according to a preset connection relationship includes: in response to the preset connection relationship being a bolt connection, determining the connection properties between all volume meshes in the preset area corresponding to the bolt hole area as a rigid unit connection. Determining the connection properties between all volume meshes in the preset area corresponding to the bolt hole area as a rigid unit connection includes: determining the connection properties between surface meshes corresponding to all volume meshes in the preset area corresponding to the bolt hole area as a rigid unit connection. Connecting each surface mesh through a rigid unit.

[0041] The preset area corresponding to the bolt area will be used as the area range of the rigid unit grabbing volume mesh. This preset area can be determined based on the diameter of the bolt hole, or it can be determined by static analysis of the bolt hole, and the area around the bolt hole where the contact pressure is greater than the preset value is used as the area of ​​the rigid unit grabbing volume mesh.

[0042] In one embodiment, all body meshes in a preset area corresponding to a bolt hole are determined, including: obtaining each contact surface when the bolt body mesh is set in the bolt hole; applying a bolt preload to the bolt body mesh to obtain a contact pressure of each contact surface; taking each contact surface with a contact pressure greater than a preset contact pressure as a preset area; and obtaining all body meshes in the preset area. In one embodiment, all body meshes in a preset area corresponding to a bolt hole area are determined, including: obtaining an area within a preset range with the bolt hole area as the center as the preset area; and obtaining all body meshes in the preset area. The selection range of the preset range can be 0.5-1.5 times the bolt diameter. For example, 0.6 times, 0.7 times, 0.8 times, and so on, of the bolt diameter can be selected.

[0043] In one embodiment, determining the connection property between volume meshes according to a preset connection relationship includes: in response to the preset connection relationship being a welding connection, obtaining a volume mesh pair by one-to-one correspondence of the volume meshes in the welding area, each volume mesh pair including two adjacent volume meshes corresponding to the outer shell and the internal device, or two adjacent volume meshes corresponding to different internal devices; determining the connection property between the two volume meshes in the volume mesh pair as a common node connection. Determining the connection property between the two volume meshes in the volume mesh pair as a common node connection includes determining the connection property between the surface meshes corresponding to the two volume meshes in the volume mesh pair as a common node connection.

[0044] As described in the above embodiment, for the welding area, the adjacent body meshes of the outer shell and the internal device in the welding area are matched one by one, the corresponding body meshes are processed with common nodes, and the connection attribute between the corresponding surface meshes is determined as common node connection. Alternatively, the adjacent body meshes of the internal device and the internal device in the welding area are matched one by one, the corresponding body meshes are processed with common nodes, and the connection attribute between the corresponding surface meshes is determined as common node connection.

[0045] In one embodiment, determining the connection properties between the volume meshes according to the preset connection relationship includes: in response to the preset connection relationship being a welding connection, determining the connection properties between all the volume meshes in the welding region as a rigid unit connection. Determining the connection properties between all the volume meshes in the welding region as a rigid unit connection includes: determining the connection properties between the surface meshes corresponding to all the volume meshes in the welding region as a rigid unit connection.

[0046] As described in the above embodiment, the welding area can be described by using rigid units, and the surface meshes corresponding to all the volume meshes in the welding area are connected by rigid units.

[0047] In one embodiment, the connection properties between volume grids are determined according to a preset connection relationship, including: in response to the preset connection relationship being a plug connection, determining a first grid center point according to the volume grid of the bottom area of ​​the plug-in part, and determining a second grid center point according to the volume grid of the plug-in hole area; determining the connection property between the first grid center point and the second grid center point as an elastic unit connection.

[0048] In this embodiment, the volume mesh of the bottom area of ​​the plug-in part is coupled to the first mesh center point through rigid unit coupling, and the volume mesh of the plug-in hole area is coupled to the second mesh center point through rigid unit coupling. The first mesh center point is the geometric center point of the surface mesh corresponding to the volume mesh of the bottom area of ​​the plug-in part, and the second mesh center point is the geometric center point of the surface mesh corresponding to the volume mesh of the plug-in hole area.

[0049] In one embodiment, the connection properties between the volume grids are determined according to the preset connection relationship, including: in response to the preset connection relationship being a glue connection, and there is no gap between the connected volume grids, the volume grids in the glue area are matched one by one to obtain a volume grid pair, each volume grid pair includes two adjacent volume grids corresponding to the outer shell and the internal device, or two adjacent volume grids corresponding to different internal devices; the connection property between the two volume grids in the volume grid pair is determined to be a common node connection; or in response to the preset connection relationship being a glue connection, and there is a gap between the connected volume grids, a connection glue body grid corresponding to the connection glue is constructed in the gap, the volume grids in the glue area are matched one by one to obtain a volume grid pair, each volume grid pair includes two adjacent volume grids corresponding to the connection glue and the internal device, or two adjacent volume grids corresponding to the connection glue and the outer shell; the connection property between the two volume grids in the volume grid pair is determined to be a common node connection. Determining the connection property between the two volume grids in the volume grid pair as a common node connection includes: determining the connection property between the surface grids corresponding to the two volume grids in the volume grid pair as a common node connection.

[0050] In one embodiment, the connection property between the volume meshes is determined according to the preset connection relationship, including: in response to the preset connection relationship being a precast connection, the volume meshes in the precast connection area are matched one by one to obtain a volume mesh pair, each volume mesh pair includes two adjacent volume meshes corresponding to the outer shell and the internal device, or two adjacent volume meshes corresponding to different internal devices; the connection property between the two volume meshes in the volume mesh pair is determined to be a common node connection. Determining the connection property between the two volume meshes in the volume mesh pair as a common node connection includes: determining the connection property between the surface meshes corresponding to the two volume meshes in the volume mesh pair as a common node connection.

[0051] Precast connections usually use an intermediate piece, the device to be connected is connected to the intermediate piece, and the intermediate piece is then connected to another device to be connected. Plastic parts are more commonly used intermediate pieces in precast connections. The precast connection in this application includes precast connections using plastic parts.

[0052] If the internal device is a precast connection of a plastic part, when the internal device is connected to the internal device or the internal device is connected to the outer shell, the plastic part is regarded as a part of the internal device. The body meshes of the connection area in the precast connection area are matched one by one and common node processing is performed. Between the internal device and the plastic part, the body meshes of the connection area are matched one by one to obtain a body mesh pair, and the body mesh pair includes two adjacent body meshes corresponding to the internal device and the plastic part respectively. Determine that the connection attribute between the two body meshes in each body mesh pair is a common node connection. Determine that the connection attribute between the two body meshes in the body mesh pair is a common node connection, including: determining that the connection attribute between the surface meshes corresponding to the two body meshes in the body mesh pair is a common node connection.

[0053] The following is a specific example to illustrate the electric drive controller simulation analysis method of the present application in more detail.

[0054] Reference Figure 3 , Figure 3 It is a schematic diagram of the structure of an electric drive controller. Taking an electric drive controller as an example, the electric drive controller includes a controller housing, a controller cover and internal components. The internal components include a PCBA board (and the electronic components installed thereon), a shielding plate, a power module and its cooling module, a busbar capacitor, a three-phase copper busbar, a Hall component, a filter component, etc., which are connected and fixed to each other by welding, plugging, bolting, etc., and finally fixed directly or indirectly to the controller housing. In order to identify the resonance risk of the electric drive controller and prevent the electric drive controller from resonant failure or resonant radiation noise during operation, it is necessary to perform modal analysis on the electric drive controller so that the modes of the first few orders are higher than the predetermined values ​​to avoid the resonance risk.

[0055] First, the controller box, controller cover and internal components of the electric drive controller are meshed.

[0056] The controller box and the controller cover can be divided by first-order hexahedral mesh or second-order tetrahedral mesh. The mesh size is selected according to the computing resources and the model size. The selection range of the mesh size is usually 2-8mm. For the mesh near the bolt holes on the controller box and the controller cover, it can be further subdivided to 2-3mm.

[0057] PCBA boards and electronic devices installed on them can be divided by second-order tetrahedral meshes. Select the mesh size based on the computing resources and model size. The mesh size selection range is usually 2-8mm. The meshes near the bolt holes on the PCBA boards and the electronic devices installed on them can be further subdivided to 2-3mm. Due to the large number of electronic devices on the PCBA board, and the complex materials and geometric shapes of the components, in order to save the time of calculation and modeling, when modeling the mesh division, these electronic devices are first screened, and the electronic devices with a height less than the preset height are screened out, and only the electronic devices with a height greater than the preset height are meshed. Because these electronic devices are small in size and weight, and their contribution to the mass and stiffness of the overall PCBA board is small, simplifying and deleting them will not have a great impact on the subsequent analysis results. For the screened electronic devices, their meshes can be further subdivided. Based on factors such as model size and complexity, the meshes can be subdivided to 0.5-1mm. Height is used to screen electronic components because it is more intuitive and convenient to obtain height information, while it is more inconvenient to obtain quality information of electronic components. Therefore, lower height is used to represent lower quality, which simplifies the screening and judgment process. The PCBA board and the electronic components mounted on it are simplified to the same material parameters. The elastic modulus of the material is equivalently calibrated based on the results of the monomer free modal simulation and the results of the monomer free modal test. The material density is equivalently calibrated based on the measured mass.

[0058] The power module and its cooling module, busbar capacitor, filter component, Hall component, etc. can be divided by first-order hexahedral mesh or second-order tetrahedral mesh. Select the mesh size according to the computing resources and model size. The selection range of mesh size is usually 2-8mm. If there are bolt holes on the above internal devices, the mesh near the bolt holes can be further subdivided, and the mesh can be subdivided to 2-3mm. The elastic modulus of the material is equivalently calibrated based on the monomer free modal simulation results and the monomer free modal test results. The material density is equivalently calibrated based on the measured mass.

[0059] The three-phase copper busbar, magnetic ring and its mounting plastic parts are divided by first-order hexahedral mesh or second-order tetrahedral mesh. The mesh size is selected according to the computing resources and model size. The selection range of mesh size is usually 2-8mm. If there are bolt holes on the above internal devices, the mesh near the bolt holes can be further subdivided to 2-3mm.

[0060] For other connecting copper bars, first-order hexahedral meshes or second-order tetrahedral meshes are used for division. Depending on the computing resources and model size, the mesh size can be selected to be 2-8mm, and the mesh near the bolt hole can be refined to 2-3mm.

[0061] After the division is completed, the internal devices and the shell each obtain the corresponding digital model. The connection properties of the grids in the connected areas between different digital models are determined to construct the connection constraint relationship.

[0062] If the connection method is welding connection, then in the welding area, the adjacent surface meshes of different numerical modes are divided according to a one-to-one correspondence, and the connection properties of the corresponding surface meshes are determined to be common node connection; or the connection properties of all surface meshes in the welding area are determined to be rigid unit connection, and all surface meshes in the welding area are connected through rigid units.

[0063] If the connection method is plug-in connection, such as between the power module and the PCBA board, there may be some pins plugged in. For this type of connection relationship, the simulation uses elastic units to simulate its connection relationship, as follows: The mesh and solid units of the pins are not reflected in the geometric model to reduce the difficulty of mesh division and the time of subsequent calculations. Take the surface mesh of the pin bottom position area, use rigid units to couple to the geometric center point of the pin bottom position area, take the surface mesh of the partner plug hole area, use rigid units to couple to the geometric center point of the plug hole area, and the two center points are connected by elastic units.

[0064] If the connection method is glue connection, if there is no gap between the two interconnected digital models, the surface meshes of the two digital models adjacent to each other in the connection area are directly divided one by one, and the connection properties of the corresponding surface meshes are determined to be common node connection. If there is a gap between the two interconnected digital models, a solid mesh is established in the gap area to simulate the connection glue, and the surface mesh of the connection glue mesh is divided one by one with the surface meshes of the adjacent areas of the two digital models, and the connection properties of the corresponding surface meshes are determined to be common node connection.

[0065] If the connection method is a precast connection of plastic parts, such as a three-phase copper busbar and a three-phase magnetic ring waiting to be connected, the connection between the device to be connected and the plastic part, as well as the connection between the plastic part and other devices to be connected, is used to achieve the connection of the two connecting devices. The three-phase copper busbar and its installed plastic parts are taken as a whole, and the adjacent surface grids with other devices to be connected in the precast connection area must correspond one to one, and the connection properties of the corresponding surface grids are determined to be common node connections. The magnetic ring and its installed plastic parts are taken as a whole, and the adjacent surface grids with other devices to be connected in the connection precast connection area must correspond one to one, and the connection properties of the corresponding surface grids are determined to be common node connections. The adjacent surface grids of the plastic parts and the three-phase copper busbar, the three-phase magnetic ring and other devices in their connection areas must also correspond one to one, and the connection properties of the corresponding surface grids are determined to be common node connections.

[0066] If there are some devices connected to other devices, such as some connected copper bars connected to other devices, taking the bus capacitor as an example, the copper bar is cut off at the outer envelope of the bus capacitor, and the part entering the bus capacitor is deleted. The cut-off part is used as the connection area, and the adjacent surface grids of the copper bar and the bus capacitor in the connection area are matched one by one. The connection properties of the corresponding grids are determined as common node connection. Other similar situations are handled in the same way.

[0067] If the connection method is bolt connection, rigid units are used for description. The scope of rigid unit capture is all mesh nodes in the threaded hole area and all mesh nodes in a certain range around the bolt hole.

[0068] The certain range area can be determined according to the diameter of the bolt hole. For example, 0.3-0.8 times of the bolt diameter can be selected as the scanning radius centered on the bolt hole. The area scanned by the scanning radius with the bolt hole as the center is used as the grabbing area of ​​the rigid unit.

[0069] The certain range area can also be obtained through static analysis. Obtain each contact surface when the bolt body mesh is set in the bolt hole area. Apply bolt preload to the bolt body mesh to obtain the contact pressure of each contact surface. Each contact surface with a contact pressure greater than the preset contact pressure is used as the gripping area of ​​the rigid unit.

[0070] After the grabbing range is determined, the connection properties between the surface meshes of all volume meshes within the grabbing range are determined as rigid unit connections, and all surface meshes are connected through rigid units.

[0071] After the mesh is divided and the connection properties are determined, the boundary conditions can be determined based on the actual situation. If the electric drive controller is directly connected to the electric drive housing or the whole vehicle by bolts, constrain the controller housing installation point to simulate its installation state. If there is rubber vibration isolation or weak bracket transfer between the electric drive controller and the electric drive housing or the whole vehicle, no constraints are made to simulate its installation state.

[0072] Then, according to the required frequency band requirements, the modal calculation frequency range is set to obtain the modes of each shell and internal components within the range.

[0073] If the obtained mode of the device or housing does not meet the preset requirements, the connection properties between the grids in the geometric model are adjusted and the modal analysis is performed again until the preset requirements are met.

[0074] like Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0075] The electronic device includes a processor 110 and a memory 120 .

[0076] The processor 110 controls the operation of the electronic device, and the processor 110 may also be referred to as a CPU (Central Processing Unit). The processor 110 may be an integrated circuit chip having the ability to process a signal sequence. The processor 110 may also be a general-purpose processor, a digital signal sequence processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0077] The memory 120 stores instructions and program data required for the processor 110 to operate.

[0078] The processor 110 is used to execute instructions to implement the method provided by any embodiment and possible combination of the simulation analysis method of the present application.

[0079] like Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of an embodiment of a computer-readable storage medium of the present application.

[0080] An embodiment of a readable storage medium of the present application includes a memory 210, and the memory 210 stores program data. When the program data is executed, the method provided by any embodiment and possible combination of the simulation analysis method of the present application is implemented.

[0081] The memory 210 may include a medium that can store program instructions, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or it may be a server that stores the program instructions. The server may send the stored program instructions to other devices for execution, or it may execute the stored program instructions itself.

[0082] In summary, the present application generates not only the outer shell mesh but also the internal device body mesh when meshing the geometric model of the electric drive controller. And the connection properties between the outer shell mesh and the internal device body mesh are determined by the preset connection relationship between the outer shell and the internal device, so that the obtained geometric model fully considers the connection constraint relationship between the outer shell and the internal device in the installed state, so that when performing modal simulation analysis based on the geometric model with the internal device body mesh and the connection properties of the body mesh, not only the modal analysis results of the outer shell can be obtained, but also the modal analysis results of the internal device can be obtained, and the obtained modal analysis results are more accurate.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0084] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0085] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0086] If the integrated units in the above other embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program codes.

[0087] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A simulation analysis method, characterized in that: Applied to an electric drive controller, the electric drive controller includes a housing and internal components, and the method includes: Acquire a geometric model of the electric drive controller; Meshing the geometric model to obtain an outer shell mesh and an internal device body mesh; Determining a connection property between the outer shell body grid and the internal device body grid according to a preset connection relationship between the outer shell and the internal device; wherein each preset connection relationship corresponds to at least one connection property; A modal simulation analysis is performed on the geometric model after the connection properties are determined to obtain a modal analysis result corresponding to the electric drive controller.

2. The method according to claim 1, characterized in that Before performing modal simulation analysis on the geometric model after determining the connection attributes to obtain a modal analysis result corresponding to the electric drive controller, the method includes: The connection properties between the internal device body grids are determined according to the preset connection relationship between the internal devices.

3. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a bolt connection, it is determined that the connection property between all volume meshes in a preset area corresponding to the bolt hole is a rigid unit connection.

4. The method according to claim 3, characterized in that Determining all volume meshes within a preset area corresponding to the bolt hole includes: Obtaining each contact surface when the bolt body mesh is set in the bolt hole; Applying a bolt pre-tightening force to the bolt body grid to obtain a contact pressure of each contact surface; taking each contact surface where the contact pressure is greater than a preset contact pressure as the preset area; Obtain all volume meshes within the preset area.

5. The method according to claim 3, characterized in that: Determining all volume meshes within a preset area corresponding to the bolt hole includes: Taking the bolt hole as the center, obtaining an area within a preset range as the preset area; Obtain all volume meshes within the preset area.

6. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a welding connection, a body grid pair is obtained by one-to-one correspondence of the body grids of the welding area, each of the body grid pairs comprising two adjacent body grids corresponding to the outer shell and the internal device, or two adjacent body grids corresponding to different internal devices; Determine that a connection attribute between the two volume meshes in the volume mesh pair is a common node connection.

7. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a welding connection, a connection property between all body meshes in the welding region is determined to be a rigid unit connection.

8. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a plug connection, determining a first grid center point according to a volume grid of a bottom area of ​​the plugging part, and determining a second grid center point according to a volume grid of an area of ​​a plugging hole; Determine that a connection attribute between the first grid center point and the second grid center point is an elastic unit connection.

9. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a glue connection, and there being no gaps between the connected body grids, the body grids in the glue area are matched one by one to obtain body grid pairs, each of the body grid pairs comprising two adjacent body grids corresponding to the outer shell and the internal device, or two adjacent body grids corresponding to different internal devices; Determine that a connection attribute between the two volume grids in the volume grid pair is a common node connection; or In response to the preset connection relationship being a glue connection, and there being a gap between the connected body grids, a connection glue body grid corresponding to the connection glue is constructed in the gap, and a body grid pair is obtained by one-to-one correspondence of the body grids in the glue area, each of the body grid pairs including two adjacent body grids corresponding to the connection glue and the internal device, or two adjacent body grids corresponding to the connection glue and the outer shell, respectively; Determine that a connection attribute between the two volume meshes in the volume mesh pair is a common node connection.

10. The method according to claim 1 or 2, characterized in that: Determining the connection attribute between volume meshes according to the preset connection relationship includes: In response to the preset connection relationship being a precast connection, a volume grid pair is obtained by one-to-one correspondence of the volume grids in the precast connection area, each of the volume grid pairs comprising two adjacent volume grids corresponding to the outer shell and the internal device, or two adjacent volume grids corresponding to different internal devices; Determine that a connection attribute between the two volume meshes in the volume mesh pair is a common node connection.

11. The method according to claim 1, characterized in that Before performing modal simulation analysis on the geometric model after determining the connection attributes to obtain a modal analysis result corresponding to the electric drive controller, the method includes: The internal device body grid is calibrated with parameters, wherein the parameters include at least one of a material elastic modulus and a material density.

12. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the memory is used to store program data, and the program data can be executed by the processor to implement the method according to any one of claims 1 to 11.

13. A computer-readable storage medium, characterized in that: Program data is stored and can be executed by a processor to implement the method according to any one of claims 1 to 11.

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