CN117708965A - Flexible auxiliary frame finite element simulation method, device, equipment, medium and product - Google Patents
Flexible auxiliary frame finite element simulation method, device, equipment, medium and product Download PDFInfo
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Abstract
The application discloses a finite element simulation method, device, equipment, medium and product of a flexible auxiliary frame. The method comprises the steps of obtaining a three-dimensional installation sleeve model and a three-dimensional installation point local model; converting the three-dimensional mounting point local model into a two-dimensional shell unit structure model; gridding the two-dimensional shell unit structure model and the three-dimensional installation sleeve model to obtain an installation point finite element model and a sleeve finite element model; connecting a finite element grid to be connected in a mounting point finite element model, and connecting the finite element grid corresponding to a nut on the lower surface of a sleeve in the sleeve finite element model, and the finite element grid corresponding to a subframe mounting base in the mounting point finite element model on the upper surface of the sleeve to generate a finite element simulation model; and simulating the stress of the frame according to the finite element simulation model to obtain a frame stress simulation result. The frame stress simulation is carried out on the flexible auxiliary frame on the basis of the finite element simulation model provided by the embodiment of the application, so that a more accurate simulation result can be obtained.
Description
Technical Field
The application relates to the field of vehicle simulation, in particular to a flexible auxiliary frame finite element simulation method, a device, equipment, a medium and a product.
Background
Most of the existing auxiliary frame simulations are simulations of rigid auxiliary frames, and only the mounting holes for mounting the rigid auxiliary frames on the vehicle body are connected by using rigid units to excite the active nodes. However, when the method is applied to the simulation of the flexible auxiliary frame, local rigidity is easily excessive, so that the problem of inaccurate simulation precision is caused.
Disclosure of Invention
The embodiment of the application provides a flexible auxiliary frame finite element simulation method, a device thereof and electronic equipment, so as to solve the technical problem of inaccurate simulation precision of the conventional flexible auxiliary frame finite element simulation method.
In a first aspect, an embodiment of the present application provides a stress simulation method for a flexible subframe, including:
acquiring a three-dimensional mounting sleeve model of the flexible auxiliary frame and a three-dimensional mounting point local model of the flexible auxiliary frame mounted on the vehicle body;
converting the three-dimensional mounting point local model into a two-dimensional shell unit structure model;
carrying out gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and carrying out gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam installed by the flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam;
connecting a finite element grid to be connected in a mounting point finite element model, and connecting a finite element grid corresponding to a nut on the lower surface of the finite element grid corresponding to a sleeve in the sleeve finite element model, and a finite element grid corresponding to a subframe mounting base in the mounting point finite element model on the upper surface of the finite element grid corresponding to the sleeve to generate a finite element simulation model of the flexible subframe;
and carrying out frame stress simulation on the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result.
In the embodiment of the application, the finite element simulation model of the flexible auxiliary frame is obtained by connecting a rigid three-dimensional mounting point local model and a flexible three-dimensional mounting sleeve model after a series of two-dimensional treatment and gridding treatment, and the frame stress simulation is carried out on the flexible auxiliary frame on the basis of the finite element simulation model, so that a more accurate simulation result can be obtained.
Optionally, in some embodiments, converting the three-dimensional mounting point local model into a two-dimensional shell element structural model includes:
extracting the middle surface of a sheet metal three-dimensional model in the three-dimensional mounting point local model;
and taking the structure corresponding to the middle surface as a two-dimensional shell unit structure model.
According to the embodiment, the plane formed by all midpoints of the sheet metal three-dimensional model along the thickness direction is extracted to serve as the two-dimensional shell unit structure model, so that the matching rate of the two-dimensional shell unit structure model and the three-dimensional mounting point local model is improved to a certain extent, and the accuracy of the frame stress simulation result can be further improved.
Optionally, in some embodiments, the finite element mesh to be connected includes a finite element mesh corresponding to at least one of a structure of a weld, a solder joint, and a bolt, and connecting the finite element mesh to be connected in the mounting point finite element model includes:
the finite element grids corresponding to the welding seams are connected by adopting rigid units to simulate welding seams;
the finite element grids corresponding to the welding spots are connected by adopting an area contact model to simulate welding spots;
the finite element grids corresponding to the bolts are connected by adopting rigid units to simulate bolts.
In this embodiment, the finite element grids corresponding to the welding seams and the bolts are connected in a simulation manner by using the rigid units (RBE 2), and the finite element grids corresponding to the welding spots are connected in a simulation manner by using the Area Contact Model (ACM), so that the actual stress conditions of the welding seams, the bolts and the welding spots can be more accurately corresponding, the reliability of the finite element simulation model can be ensured, and the accuracy of the frame stress simulation result is further effectively improved.
Optionally, in some embodiments, the finite element mesh corresponding to the nut is connected to the lower surface of the finite element mesh corresponding to the sleeve in the sleeve finite element model, and the finite element mesh corresponding to the nut is connected to the upper surface of the finite element mesh corresponding to the subframe mounting base in the mounting point finite element model, including:
and simulating the finite element grids corresponding to the nuts on the lower surface of the finite element grid corresponding to the sleeve in the connecting sleeve finite element model, and the finite element grids corresponding to the mounting points on the upper surface of the finite element grid corresponding to the sleeve.
The embodiment can more accurately simulate the actual stress condition of the sleeve, thereby further ensuring the reliability of the finite element simulation model and further improving the accuracy of the frame stress simulation result.
Optionally, in some embodiments, performing frame stress simulation on the flexible subframe according to the finite element simulation model to obtain a frame stress simulation result, including:
exciting hard points in the sleeve finite element model;
and testing the frame stress performance parameters of the flexible auxiliary frame under the excitation action to obtain the frame stress simulation result of the flexible auxiliary frame.
In the embodiment, the whole process of stress simulation analysis is simple to operate, and the hard points in the flexible sleeve finite element model are excited, so that the stress condition of the flexible auxiliary frame is more in line with the actual condition, namely, the accuracy of the stress simulation result of the frame is improved.
Optionally, in some embodiments, the hard point is a center point of the sleeve finite element model. Therefore, the stress simulation condition of the flexible auxiliary frame can be analyzed more comprehensively and accurately.
In a second aspect, an embodiment of the present application provides a stress simulation device for a flexible subframe, including:
the acquisition module is used for acquiring a three-dimensional installation sleeve model of the flexible auxiliary frame and a three-dimensional installation point local model of the flexible auxiliary frame installed on the vehicle body;
the conversion module is used for converting the three-dimensional installation point local model into a two-dimensional shell unit structure model;
the gridding module is used for carrying out gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and carrying out gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam mounted on the flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam;
the connecting module is used for connecting the to-be-connected finite element grids in the mounting point finite element model, connecting the finite element grids corresponding to the nuts on the lower surface of the finite element grids corresponding to the sleeves in the sleeve finite element model and the finite element grids corresponding to the subframe mounting bases in the mounting point finite element model on the upper surface of the finite element grids corresponding to the sleeves, and generating a finite element simulation model of the flexible subframe;
and the simulation module is used for simulating the frame stress of the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result.
In a third aspect, an embodiment of the present application provides an electronic device, including: a processor and a memory storing program instructions; the processor, when executing program instructions, implements the method of the first aspect.
In a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon program instructions that when executed by a processor implement the method of the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product, instructions in which, when executed by a processor of an electronic device, cause the electronic device to perform the method of the first aspect.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a flow chart of a stress simulation method of a flexible subframe according to an embodiment of the present application;
fig. 2 is a schematic diagram of a positional relationship between a mounting point finite element model and a sleeve finite element model in a stress simulation method of a flexible subframe according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a stress simulation device of a flexible subframe according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
In the drawings, the drawings are not necessarily to scale.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.
The embodiment of the application provides a flexible auxiliary frame finite element simulation method, device, equipment, medium and product, so as to solve the technical problem of inaccurate simulation precision of the conventional flexible auxiliary frame finite element simulation method. The following first describes a finite element simulation method for a flexible subframe provided in an embodiment of the present application.
Referring to fig. 1, fig. 1 is a flow chart of a flexible subframe finite element simulation method according to an embodiment of the present application, where the flexible subframe finite element simulation method may include the following steps:
step 101, acquiring a three-dimensional installation sleeve model of a flexible auxiliary frame and a three-dimensional installation point local model of the flexible auxiliary frame installed on a vehicle body;
step 102, converting a three-dimensional mounting point local model into a two-dimensional shell unit structure model;
step 103, carrying out gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and carrying out gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam installed on a flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam;
step 104, connecting the to-be-connected finite element grids in the mounting point finite element model, connecting the finite element grids corresponding to the nuts on the lower surface of the finite element grids corresponding to the sleeves in the sleeve finite element model, and connecting the finite element grids corresponding to the sub-frame mounting bases in the mounting point finite element model on the upper surface of the finite element grids corresponding to the sleeves, so as to generate a finite element simulation model of the flexible sub-frame;
and 105, carrying out frame stress simulation on the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result.
In the embodiment of the application, the flexible auxiliary frame finite element simulation method can obtain a three-dimensional installation sleeve model of the flexible auxiliary frame and a three-dimensional installation point local model of the flexible auxiliary frame installed on the vehicle body; converting the three-dimensional mounting point local model into a two-dimensional shell unit structure model; carrying out gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and carrying out gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam installed by the flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam; connecting a finite element grid to be connected in a mounting point finite element model, and connecting a finite element grid corresponding to a nut on the lower surface of the finite element grid corresponding to a sleeve in the sleeve finite element model, and a finite element grid corresponding to a subframe mounting base in the mounting point finite element model on the upper surface of the finite element grid corresponding to the sleeve to generate a finite element simulation model of the flexible subframe; and carrying out frame stress simulation on the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result. Therefore, the finite element simulation model of the flexible auxiliary frame is obtained by connecting a series of three-dimensional installation point local models based on rigidity and the flexible three-dimensional installation sleeve models after two-dimensional treatment and gridding treatment, and the frame stress simulation is carried out on the flexible auxiliary frame on the basis of the finite element simulation model, so that more accurate simulation results can be obtained.
In step 101, it may be understood that, to build a finite element simulation model of the flexible subframe to perform a frame stress simulation analysis on the flexible subframe, a three-dimensional installation sleeve model of the flexible subframe and a three-dimensional installation point local model of the flexible subframe installed on the vehicle body need to be obtained first. The three-dimensional installation sleeve model and the three-dimensional installation point local model can be obtained by modeling the vehicle body assembly and the sleeve structure through modeling software in advance.
The three-dimensional mounting point local model may include body assemblies such as stringers, beams, beam connection plates, and body connection plates for connection with the flexible subframe, in other words, the flexible subframe may be mounted on the body assembly, such as the flexible subframe being mounted on the stringers of the body assembly. The three-dimensional mounting sleeve model may include a sleeve structure, i.e., the flexible subframe is mounted on the vehicle body through the sleeve structure, and it is understood that the sleeve structure is generally a flexible structure, so that the subframe is not rigidly connected (e.g., welded, screwed, etc.) to the vehicle body assembly, and thus the finite element simulation method provided by the embodiments of the present application is applied to the flexible subframe.
In step 102, the three-dimensional mounting point local model may be converted into a two-dimensional shell-element structural model. For example, a sheet metal three-dimensional model in the three-dimensional installation point local model can be extracted to serve as a two-dimensional shell unit structure model corresponding to the three-dimensional installation point local model according to the direction of the sheet metal thickness of the sheet metal three-dimensional model. For example, a two-dimensional model formed on the inner surface of the sheet metal three-dimensional model may be used as a corresponding two-dimensional shell unit structure model, a two-dimensional model formed on the outer surface of the sheet metal three-dimensional model may be used as a corresponding two-dimensional shell unit structure model, and a two-dimensional model formed on a plane where a midpoint in the thickness direction of the sheet metal three-dimensional model is located may be used as a corresponding two-dimensional shell unit structure model.
The three-dimensional installation point local model comprises a vehicle body assembly, the three-dimensional installation point local model is quite complex in structural formula, the three-dimensional installation point local model is converted into a two-dimensional shell unit structural model on the basis, in the subsequent gridding treatment process, the two-dimensional model is simpler in grid division compared with the three-dimensional model, the number of grids is smaller, the scale of the finite element simulation model is reduced, and therefore the efficiency of building the finite element simulation model is effectively improved.
In step 103, a gridding process may be performed on both the two-dimensional shell-unit structural model and the three-dimensional installation sleeve model. It will be appreciated that the meshing process may be implemented by way of a free meshing, a mapped meshing, a hybrid meshing, and the like. Or the connection points (such as welding lines, welding points, bolts and the like) among different parts can be divided independently, and then the rest parts are divided into grids, so that the gridding treatment of the whole model is completed.
For example, the two-dimensional shell element structural model may be subjected to a gridding process to obtain a mounting point finite element model including a plurality of finite element grids, wherein the mounting point finite element model includes at least a longitudinal beam on which the flexible subframe is mounted and at least a portion of a vehicle body above the longitudinal beam. In other words, the plurality of finite element meshes of the mounting point finite element model may correspond to the structure of the side member and at least part of the vehicle body at the upper portion of the side member. Under normal conditions, the mounting point finite element model can comprise the whole vehicle body structure, so that the flexible auxiliary frame can be ensured to be mounted on the vehicle body through the sleeve, and when the flexible auxiliary frame is subjected to stress simulation analysis, the vehicle body can provide enough support for the flexible auxiliary frame, and the accuracy of the stress simulation result can be improved.
The three-dimensional installation sleeve model can be subjected to gridding treatment, and the three-dimensional installation sleeve model is diced to generate a plurality of tetrahedral or hexahedral finite element grids, so that the sleeve finite element model is obtained, wherein the plurality of finite element grids of the sleeve finite element model can correspond to the sleeve structure.
In step 104, the finite element mesh to be connected in the installation point finite element model, for example, the finite element mesh corresponding to the structures of the weld joint, the welding spot, the bolt and the like, may be considered as the finite element mesh to be connected, and may be connected in a preset connection mode, so as to obtain the installation point finite element model after connection is completed.
As shown in fig. 2, the lower surface of the finite element mesh corresponding to the sleeve 201 in the sleeve finite element model may be connected with the finite element mesh corresponding to the nut 203, that is, the nut 203 and the lower surface of the sleeve 201 may be connected in the sleeve finite element model. And the upper surface of the finite element mesh corresponding to the sleeve 201 and the finite element mesh corresponding to the subframe mounting base 202 in the mounting point finite element model, in other words, the upper surface of the sleeve 201 and the subframe mounting base 202 can be connected to realize the connection of the sleeve finite element model and the mounting point finite element model, so that the finite element simulation model of the flexible subframe can be generated.
In step 105, the frame stress simulation is performed on the flexible auxiliary frame according to the finite element simulation model, so as to obtain a frame stress simulation result. It can be understood that the dynamic stiffness of the flexible auxiliary frame at the mounting point (namely the sleeve position) can be obtained and analyzed by inputting stress condition parameters to the finite element simulation model according to actual conditions, so that the stress condition of the flexible auxiliary frame can be verified, further an accurate frame stress simulation result can be obtained, and a reliable reference basis is provided for vehicle development.
Optionally, in some embodiments, the step 102 may include the following steps:
extracting the middle surface of a sheet metal three-dimensional model in the three-dimensional mounting point local model;
and taking the structure corresponding to the middle surface as a two-dimensional shell unit structure model.
In this embodiment, a middle plane of the sheet metal three-dimensional model in the three-dimensional installation point local model may be extracted, where the middle plane may be a plane formed by all midpoints of the sheet metal three-dimensional model along the thickness direction thereof, and a structure of the middle plane is used as a two-dimensional shell unit structure model corresponding to the three-dimensional installation point local model.
It can be understood that, for some structures with inconsistent inner surfaces and outer surfaces of metal plates, if the outer surfaces or the inner surfaces of the three-dimensional metal plate models are used as the two-dimensional shell unit structure models, the stress of the two-dimensional shell unit structure models and the actual stress of the local models of the three-dimensional mounting points may deviate, so that the stress simulation results of the subsequent frames are inaccurate. Based on the above, the plane formed by all midpoints of the sheet metal three-dimensional model along the thickness direction is extracted to be used as the two-dimensional shell unit structure model, so that the matching rate of the two-dimensional shell unit structure model and the three-dimensional mounting point local model is improved to a certain extent, and the accuracy of the frame stress simulation result can be further improved.
Optionally, in some embodiments, the finite element mesh to be connected includes a finite element mesh corresponding to at least one structure of a weld, a welding point, and a bolt, where the finite element mesh to be connected in the finite element model of the connection installation point may include the following steps:
the finite element grids corresponding to the welding seams are connected by adopting rigid units to simulate welding seams;
the finite element grids corresponding to the welding spots are connected by adopting an area contact model to simulate welding spots;
the finite element grids corresponding to the bolts are connected by adopting rigid units to simulate bolts.
In this embodiment, the finite element mesh to be connected may include a finite element mesh corresponding to at least one structure of a weld, a welding spot, and a bolt. Wherein, the finite element grids corresponding to the welding lines and the bolts can be connected in a simulation way by adopting a rigid unit (RBE 2). It can be understood that the RBE2 defines one node as an independent master node, and the other nodes as dependent slave nodes, and the master node is taken as a reference when the displacement of the nodes is calculated, and the slave nodes keep the degree of freedom constraint with the master node to form rigid motion, so that the actual stress condition of the welding seam and the bolt can be more accurately simulated.
The finite element grids corresponding to the welding spots can be connected in a simulation mode by adopting an Area Contact Model (ACM), so that the actual stress condition of the welding spots can be simulated more accurately. It will be appreciated that the ACM is formed by a hexahedral unit, which is located between the two welded parts and perpendicular to the welded surfaces, respectively connected to the shell units of the two welded parts by RBE 3. The load is diffused to a plurality of welded nodes through RBE3, and the diffusion direction and the size of the load can be determined according to the weight coefficient of RBE 3. RBE3 is not a rigid unit, and RBE3 may define a master node and a plurality of slave nodes, which calculate the displacement of each slave node separately and then calculate the displacement of the master node based on the constraints of the slave node and the master node when calculating the displacement of the node. RBE3 is typically used to distribute concentrated forces/moments to individual slave nodes in the area of actual load, and after each slave node has obtained the distributed forces, the individual deformations are in fact the process of distributing total forces/total moments to each node instead of manually.
In this embodiment, the finite element grids simulated by the welding seam and the bolt are connected in a simulation manner by using a rigid unit (RBE 2), and the finite element grids corresponding to the welding spot are connected in a simulation manner by using an Area Contact Model (ACM), so that the actual stress conditions of the welding seam, the bolt and the welding spot can be more accurately corresponding, the reliability of the finite element simulation model can be ensured, and the accuracy of the frame stress simulation result is further effectively improved.
Optionally, in some embodiments, the finite element mesh corresponding to the nut on the lower surface of the finite element mesh corresponding to the sleeve in the finite element model of the connecting sleeve, and the finite element mesh corresponding to the subframe mounting base in the finite element model on the upper surface of the finite element mesh corresponding to the sleeve may include the following steps:
and simulating the finite element grids corresponding to the nuts on the lower surface of the finite element grid corresponding to the sleeve in the connecting sleeve finite element model, and the finite element grids corresponding to the mounting points on the upper surface of the finite element grid corresponding to the sleeve.
As shown in fig. 2, in the present embodiment, the finite element mesh corresponding to the nut 203 and the lower surface of the finite element mesh corresponding to the sleeve 201 may be connected in a simulation manner using a rigid unit (RBE 2). Similarly, the upper surface of the finite element mesh corresponding to the sleeve 201 and the finite element mesh corresponding to the subframe mounting base 202 in the mounting point finite element model may also be connected in a simulation manner by using a rigid unit (RBE 2). According to the characteristics of RBE2 connection, the actual stress condition of the sleeve 201 can be more accurately simulated, so that the reliability of the finite element simulation model can be further ensured, and the accuracy of the frame stress simulation result is further improved.
Optionally, in some embodiments, the step 105 may include the following steps:
exciting hard points in the sleeve finite element model;
and testing the frame stress performance parameters of the flexible auxiliary frame under the excitation action to obtain the frame stress simulation result of the flexible auxiliary frame.
As shown in fig. 2, in this embodiment, when the stress simulation is performed on the flexible auxiliary frame, a hard point 204 in the sleeve finite element model may be input in advance in the excitation engineering design stage, then the hard point 204 may be directly excited, a frame stress performance parameter of the flexible auxiliary frame under the excitation effect is obtained, and the frame stress performance parameter is analyzed, so that a frame stress simulation result of the flexible auxiliary frame may be obtained. The whole process is simple to operate, and hard points in the flexible sleeve finite element model are excited, so that the stress condition of the flexible auxiliary frame is more in line with the actual condition, namely the accuracy of the frame stress simulation result is improved.
Alternatively, in some embodiments, the hard point may be the center point of the sleeve finite element model.
It can be understood that in an ideal state, the stress of the sleeve should be uniformly diffused with the excited hard point as the center, based on which, in order to more comprehensively and accurately analyze the stress simulation situation of the flexible subframe, in this embodiment, the center point of the sleeve finite element model may be used as the hard point.
Based on the method for simulating the finite element of the flexible auxiliary frame provided by the embodiment, the application also provides an embodiment of the device for simulating the finite element of the flexible auxiliary frame.
Fig. 3 is a schematic structural diagram of a flexible subframe finite element simulation device according to another embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment of the present application is shown.
Referring to fig. 3, a flexible subframe finite element simulation apparatus 300 may include:
the acquisition module 301 is configured to acquire a three-dimensional installation sleeve model of the flexible auxiliary frame and a three-dimensional installation point local model of the flexible auxiliary frame installed on the vehicle body;
the conversion module 302 is used for converting the three-dimensional installation point local model into a two-dimensional shell unit structure model;
the gridding module 303 is configured to perform gridding processing on the two-dimensional shell unit structure model to obtain a mounting point finite element model including a plurality of finite element grids, and perform gridding processing on the three-dimensional mounting sleeve model to obtain a sleeve finite element model including a plurality of finite element grids, where the mounting point finite element model includes at least a longitudinal beam installed by the flexible subframe and at least a part of a vehicle body above the longitudinal beam;
the connection module 304 is used for connecting the to-be-connected finite element grids in the installation point finite element model, connecting the finite element grids corresponding to the nuts on the lower surface of the finite element grids corresponding to the sleeves in the sleeve finite element model, and connecting the finite element grids corresponding to the subframe installation bases in the installation point finite element model on the upper surface of the finite element grids corresponding to the sleeves, so as to generate a finite element simulation model of the flexible subframe;
the simulation module 305 is configured to simulate the frame stress of the flexible subframe according to the finite element simulation model, so as to obtain a frame stress simulation result.
Optionally, in some embodiments, the conversion module 302 may also be configured to:
extracting the middle surface of a sheet metal three-dimensional model in the three-dimensional mounting point local model;
and taking the structure corresponding to the middle surface as a two-dimensional shell unit structure model.
Optionally, in some embodiments, the finite element mesh to be connected includes a finite element mesh corresponding to at least one of a structure of a weld, and a bolt, and the connection module may be configured to:
the finite element grids corresponding to the welding seams are connected by adopting rigid units to simulate welding seams;
the finite element grids corresponding to the welding spots are connected by adopting an area contact model to simulate welding spots;
the finite element grids corresponding to the bolts are connected by adopting rigid units to simulate bolts.
Optionally, in some embodiments, the connection module may also be used to:
and simulating the finite element grids corresponding to the nuts on the lower surface of the finite element grid corresponding to the sleeve in the connecting sleeve finite element model, and the finite element grids corresponding to the mounting points on the upper surface of the finite element grid corresponding to the sleeve.
Optionally, in some embodiments, the simulation module 305 is further configured to:
exciting hard points in the sleeve finite element model;
and testing the frame stress performance parameters of the flexible auxiliary frame under the excitation action to obtain the frame stress simulation result of the flexible auxiliary frame.
Optionally, in some embodiments, the hard point is a center point of the sleeve finite element model.
It should be noted that, based on the same concept as the embodiment of the method of the present application, the content of information interaction and execution process between the above devices/units is a device corresponding to the method for detecting the alignment degree of the battery pole piece, and all implementation manners in the above method embodiment are applicable to the embodiment of the device, and specific functions and technical effects thereof may be referred to the method embodiment section, and are not repeated herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 4 shows a schematic hardware structure of an electronic device according to another embodiment of the present application.
The electronic device may include a processor 401 and a memory 402 in which programs or instructions are stored. The steps of any of the various method embodiments described above are implemented when the processor 401 executes a program.
For example, a program may be divided into one or more modules/units, which are stored in the memory 402 and executed by the processor 401 to complete the present application. One or more of the modules/units may be a series of program instruction segments capable of performing specific functions to describe the execution of the program in the device.
In particular, the processor 401 described above may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of embodiments of the present application.
Memory 402 may include mass storage for data or instructions. By way of example, and not limitation, memory 402 may comprise a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. Memory 402 may include removable or non-removable (or fixed) media, where appropriate. Memory 402 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 402 is a non-volatile solid state memory.
The memory may include Read Only Memory (ROM), random Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors) it is operable to perform the operations described with reference to methods in accordance with aspects of the present disclosure.
The processor 401 implements any of the methods of the above embodiments by reading and executing programs or instructions stored in the memory 402.
In one example, the electronic device may also include a communication interface 403 and a bus 404. The processor 401, the memory 402, and the communication interface 403 are connected to each other by a bus 404 and perform communication with each other.
The communication interface 403 is mainly used to implement communication between each module, device, unit and/or apparatus in the embodiments of the present application.
Bus 404 includes hardware, software, or both, coupling the components of the online data flow billing device to each other. By way of example, and not limitation, the buses may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a micro channel architecture (MCa) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of the above. Bus 404 may include one or more buses, where appropriate. Although embodiments of the present application describe and illustrate a particular bus, the present application contemplates any suitable bus or interconnect.
In addition, in combination with the method in the above embodiment, the embodiment of the application may be implemented by providing a readable storage medium. The readable storage medium has a program or instructions stored thereon; the program or instructions, when executed by a processor, implement any of the methods of the embodiments described above. The readable storage medium may be read by a machine such as a computer.
The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used for running a program or an instruction, implementing each process of the above method embodiment, and achieving the same technical effect, so as to avoid repetition, and not repeated here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
Embodiments of the present application provide a computer program product stored in a readable storage medium, where the program product is executed by at least one processor to implement the respective processes of the above method embodiments, and achieve the same technical effects, and are not repeated herein.
It should be clear that the present application is not limited to the particular arrangements and processes described above and illustrated in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps, after appreciating the spirit of the present application.
The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer grids such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be different from the order in the embodiments, or several steps may be performed simultaneously.
Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs or instructions. These programs or instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to being, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware which performs the specified functions or acts, or combinations of special purpose hardware and computer instructions.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, the technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A method for finite element simulation of a flexible subframe, the method comprising:
acquiring a three-dimensional mounting sleeve model of a flexible auxiliary frame and a three-dimensional mounting point local model of the flexible auxiliary frame mounted on a vehicle body;
converting the three-dimensional mounting point local model into a two-dimensional shell unit structure model;
performing gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and performing gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam mounted on the flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam;
connecting the finite element grids to be connected in the mounting point finite element model, connecting the finite element grids corresponding to the nuts on the lower surface of the finite element grid corresponding to the sleeve in the sleeve finite element model, and connecting the finite element grids corresponding to the nuts on the upper surface of the finite element grid corresponding to the sleeve with the finite element grids corresponding to the subframe mounting base in the mounting point finite element model, so as to generate a finite element simulation model of the flexible subframe;
and carrying out frame stress simulation on the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result.
2. The method of claim 1, wherein said converting the three-dimensional mounting point local model into a two-dimensional shell element structural model comprises:
extracting the middle surface of a sheet metal three-dimensional model in the three-dimensional installation point local model;
and taking the structure corresponding to the middle surface as the two-dimensional shell unit structure model.
3. The method of claim 1, wherein the finite element mesh to be connected comprises a finite element mesh corresponding to at least one of a weld, a solder joint, and a bolt, and the connecting the finite element mesh to be connected in the mounting point finite element model comprises:
the finite element grids corresponding to the welding seams are connected by adopting rigid units to simulate welding seams;
the finite element grids corresponding to the welding spots are connected by adopting an area contact model to simulate welding spots;
the finite element grids corresponding to the bolts are connected by adopting rigid units to simulate bolts.
4. A method according to any one of claims 1 to 3, wherein said connecting the lower surface of the finite element mesh corresponding to the sleeve in the sleeve finite element model with the finite element mesh corresponding to the nut, and the upper surface of the finite element mesh corresponding to the sleeve with the subframe mounting base in the mounting point finite element model comprises:
and simulating and connecting the lower surface of the finite element grid corresponding to the sleeve in the sleeve finite element model with the finite element grid corresponding to the nut, and the upper surface of the finite element grid corresponding to the sleeve with the finite element grid corresponding to the subframe mounting base in the mounting point finite element model by adopting a rigid unit.
5. The method of claim 4, wherein the performing the frame stress simulation on the flexible subframe according to the finite element simulation model to obtain a frame stress simulation result comprises:
exciting hard points in the sleeve finite element model;
and testing the frame stress performance parameters of the flexible auxiliary frame under the excitation action to obtain the frame stress simulation result of the flexible auxiliary frame.
6. A flexible subframe finite element simulation apparatus, the apparatus comprising:
the acquisition module is used for acquiring a three-dimensional installation sleeve model of the flexible auxiliary frame and a three-dimensional installation point local model of the flexible auxiliary frame installed on the vehicle body;
the conversion module is used for converting the three-dimensional installation point local model into a two-dimensional shell unit structure model;
the gridding module is used for carrying out gridding treatment on the two-dimensional shell unit structure model to obtain a mounting point finite element model comprising a plurality of finite element grids, and carrying out gridding treatment on the three-dimensional mounting sleeve model to obtain a sleeve finite element model comprising a plurality of finite element grids, wherein the mounting point finite element model at least comprises a longitudinal beam mounted on the flexible auxiliary frame and at least part of a vehicle body at the upper part of the longitudinal beam;
the connecting module is used for connecting the to-be-connected finite element grids in the mounting point finite element model, connecting the finite element grids corresponding to the nuts on the lower surface of the finite element grids corresponding to the sleeves in the sleeve finite element model, and connecting the finite element grids corresponding to the nuts on the upper surface of the finite element grids corresponding to the sleeves with the finite element grids corresponding to the subframe mounting base in the mounting point finite element model, so as to generate a finite element simulation model of the flexible subframe;
and the simulation module is used for simulating the stress of the flexible auxiliary frame according to the finite element simulation model to obtain a frame stress simulation result.
7. The apparatus of claim 6, wherein the conversion module is further configured to:
extracting the middle surface of a sheet metal three-dimensional model in the three-dimensional installation point local model;
and taking the structure corresponding to the middle surface as the two-dimensional shell unit structure model.
8. The apparatus of claim 6, wherein the finite element mesh to be connected comprises a finite element mesh corresponding in structure to at least one of a weld, a solder joint, and a bolt, the connection module being configured to:
the finite element grids corresponding to the welding seams are connected by adopting rigid units to simulate welding seams;
the finite element grids corresponding to the welding spots are connected by adopting an area contact model to simulate welding spots;
the finite element grids corresponding to the bolts are connected by adopting rigid units to simulate bolts.
9. The apparatus of any one of claims 6 to 8, wherein the connection module is further configured to:
and simulating and connecting the lower surface of the finite element grid corresponding to the sleeve in the sleeve finite element model with the finite element grid corresponding to the nut, and the upper surface of the finite element grid corresponding to the sleeve with the finite element grid corresponding to the subframe mounting base in the mounting point finite element model by adopting a rigid unit.
10. The apparatus of claim 9, wherein the simulation module is further configured to:
exciting hard points in the sleeve finite element model;
and testing the frame stress performance parameters of the flexible auxiliary frame under the excitation action to obtain the frame stress simulation result of the flexible auxiliary frame.
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