CN114117845A - Model simulation method, device and equipment - Google Patents
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Abstract
The invention relates to a model simulation method, a device and equipment, wherein the method comprises the following steps: acquiring a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece; obtaining a first force and displacement curve of the buckle when the buckle is plugged in and pulled out of the fixed piece according to the detailed finite element model; correcting the first force and displacement curve to obtain a second force and displacement curve; creating a simplified buckle model corresponding to the buckle structure based on a connection unit; obtaining a simplified finite element model according to the second force and displacement curve and the simplified buckle model; and adding the simplified finite element model to a database of the finished automobile to complete finite element analysis of the finished automobile. The simplified finite element model of the buckle structure in the stress state is obtained by simplifying the detailed finite element model of the buckle structure, so that the simulation calculation efficiency is greatly improved, and the accuracy requirement of the performance analysis of the whole vehicle can be met.
Description
Technical Field
The invention relates to the technical field of automobile simulation, in particular to a model simulation method, a device and equipment.
Background
The buckle structure has been widely used in the design of automobile products due to the characteristics of simple structure, small occupied space, easy assembly, low cost and the like without additional connecting parts. Along with the improvement of consumer's internal and external decoration perception quality, outward appearance and easy dismounting nature requirement, the use of plastics buckle on automotive interior spare is more and more, if: doors, floors, headliners, and seats, etc. The stress condition of the buckle in the inserting and inserting processes directly influences the connection reliability and the attractiveness of the buckle, so that the condition of the plastic buckle is considered to be particularly important when the performance of the whole vehicle is analyzed.
Because the random vibration generated in the vehicle running process can greatly affect the buckle, and the phenomenon of buckle fracture occurs, the buckle is often subjected to simulation analysis when the structure is designed. Conventional simulation analysis includes: 1. finite element modeling is carried out on a plastic buckle (standard part/non-standard structure) of a vehicle body, simulation software is applied to carry out simulation analysis on the buckle connection process, and the influence of the structural design parameters of the buckle (non-standard structure) on the performance of the buckle is researched; 2. testing the insertion and extraction force of a plastic buckle (standard component/non-standard structure) of the vehicle body in the connection process, calibrating a detailed finite element model of the buckle based on test data, and ensuring that the consistency of the insertion and extraction force analysis and the test reaches more than 80%; 3. carrying out dimension reduction and simplification simulation research on a plastic buckle (a standard part/a non-standard structure) of a vehicle body, and developing an automatic buckle connecting connector suitable for simulation software; 4. and (3) applying simulation software to carry out vehicle door forced closing simulation analysis and examining the effectiveness of vehicle door interior trim buckle connection. Finite element analysis of the plugging and unplugging process of the plastic buckles is a nonlinear large-deformation contact problem, a plurality of plastic buckles exist in an automobile, simulation time which is completed once is consumed for calculating one buckle, and enterprises adopt a simplified mode to only rigidly connect the plastic buckles when analyzing the whole automobile, and do not consider the stress state of the plastic buckles, namely, the displacement and failure of the buckles, so that the performance analysis of the safety and the comfort of the whole automobile is influenced to a certain extent.
Therefore, it is necessary to provide a model simulation method that can greatly reduce the simulation computation time of the buckle and meet the accuracy requirement of the performance analysis of the entire vehicle to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a model simulation method. The problem of have among the prior art that there are many plastics buckles in the car and need carry out a large amount of emulation work and accomplish whole car performance evaluation, waste time is solved.
The technical effects of the invention are realized as follows:
a method of model simulation, the method comprising:
acquiring a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
obtaining a first force and displacement curve of the buckle when the buckle is plugged in and pulled out of the fixed piece according to the detailed finite element model;
correcting the first force and displacement curve to obtain a second force and displacement curve;
creating a simplified buckle model corresponding to the buckle structure based on a connection unit;
obtaining a simplified finite element model according to the second force and displacement curve and the simplified buckle model, wherein the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
and adding the simplified finite element model to a database of the finished automobile to complete finite element analysis of the finished automobile. The second force and displacement curve obtained by finite element analysis of the detailed finite element model is applied to the connecting unit, and the connecting unit is used for replacing two parts, namely the buckle and the fixing part, so that the problem of complex nonlinear large deformation is converted into a simple tension and compression problem, and a simplified finite element model of the buckle structure in a stressed state is obtained, thereby greatly improving the simulation calculation efficiency and solving the problem that a lot of plastic buckles in the automobile in the prior art need to perform a large amount of simulation work to complete the performance evaluation of the whole automobile and waste time; and the mode that only the buckle connection is simplified into the rigid body connection in the finite element analysis of the whole vehicle is replaced, the accuracy requirement of the performance analysis of the whole vehicle is met, and the accuracy of the finite element analysis of the whole vehicle is ensured.
Furthermore, the connection unit is a first connector or a second connector, the first connector can move along the plugging and unplugging direction of the first connector, and the second connector can move along the plugging and unplugging direction of the second connector and can rotate around the rotating direction of the plugging and unplugging direction. The dimension reduction and simplification are carried out on the detailed finite element model of the buckle structure in the plugging and unplugging process, the simplified buckle finite element model corresponding to the first connector with only one degree of freedom in the plugging and unplugging direction or the simplified buckle finite element model corresponding to the second connector with the plugging and unplugging direction and the rotating direction around the plugging and unplugging direction are obtained, the model complexity is reduced, the finite element analysis time is greatly reduced, the calculation efficiency is improved, and the finite element analysis precision is ensured.
Further, obtaining a detailed finite element model of the snap structure, previously comprising:
acquiring information of a buckle structure and a detailed buckle model corresponding to the buckle structure, wherein the information of the buckle structure comprises the specification of a buckle, the specification of a fixing piece, the stretching parameter of a buckle material and the tangential friction force between the buckle and the fixing piece;
and processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure.
Further, processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure, including:
geometrically cleaning the detailed buckle model;
carrying out full-freedom constraint on the rear end of the fixing piece;
and performing kinematic coupling on the reference point of the contact surface of the buckle and the reference point of the contact surface of the fixing piece based on the information of the buckle structure to obtain a detailed finite element model.
Further, the step of obtaining a detailed finite element model by performing kinematic coupling on the reference point of the contact surface of the buckle and the reference point of the contact surface of the fixing piece based on the information of the buckle structure includes:
obtaining the clamping size between the buckle and the fixing piece according to the specification of the buckle and the specification of the fixing piece;
obtaining a displacement and time curve according to the clamping size between the buckle and the fixing piece;
and performing kinematic coupling between a reference point of the contact surface of the buckle and a reference point of the contact surface of the fixing piece based on the curve of the displacement and the time to obtain a detailed finite element model.
Further, the correcting the force and displacement curve to obtain a second force and displacement curve includes:
and setting the force after the buckle and the fixing piece are separated to be 0 in the force and displacement curve to obtain a second force and displacement curve. The force generated after the buckle and the fixing piece are completely separated in the force and displacement curve is abandoned, so that the plugging and unplugging analysis of the buckle structure is not influenced, and the calculation time of finite element analysis is reduced.
Further, obtaining a first force and displacement curve of the buckle when the buckle is plugged on the fixing piece according to the detailed finite element model, and the method comprises the following steps:
obtaining a force and displacement curve corresponding to the detailed finite element model according to the detailed finite element model;
acquiring a force and displacement curve of a buckle structure in a plugging and unplugging experiment;
determining the consistency of the force and the displacement curve corresponding to the detailed finite element model and the force and the displacement curve of the buckle structure in the plugging and unplugging experiment;
and when the consistency degree is higher than a first preset value, the force and displacement curve corresponding to the detailed finite element model is a first force and displacement curve.
Further, obtaining a simplified finite element model from the second force versus displacement curve and the simplified snap model, comprising:
obtaining a finite element model according to the second force and displacement curve and the simplified buckle model;
determining the precision of the second force and displacement curve according to the first force and displacement curve and the second force and displacement curve;
and when the precision is higher than a second preset value, the finite element model is a simplified finite element model.
In addition, there is also provided a model simulation apparatus, the apparatus including:
a detailed finite element model acquisition module: the method comprises the steps of obtaining a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
a first force versus displacement curve obtaining module: the first force and displacement curve when the buckle is plugged in and pulled out of the fixed piece is obtained according to the detailed finite element model;
a second force versus displacement curve deriving module: the first force and displacement curve is corrected to obtain a second force and displacement curve;
the simplified buckle model creation module: the simplified buckle model is used for creating a corresponding buckle structure based on a connecting unit;
simplifying the finite element model to obtain a module: the simplified finite element model is obtained according to the second force and displacement curve and the simplified buckle model, and the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
finished automobile finite element analysis module: and the method is used for adding the simplified finite element model to a database of the finished automobile to complete the finite element analysis of the finished automobile.
In addition, an apparatus is also provided, which includes a processor and a memory, where at least one instruction, at least one program, a set of codes, or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the model simulation method described above.
As described above, the present invention has the following advantageous effects:
1) the second force and displacement curve obtained by finite element analysis of the detailed finite element model is applied to the connecting unit, and the connecting unit is used for replacing two parts, namely the buckle and the fixing part, so that the problem of complex nonlinear large deformation is converted into a simple tension and compression problem, and a simplified finite element model of the buckle structure in a stressed state is obtained, thereby greatly improving the simulation calculation efficiency and solving the problem that a lot of plastic buckles in the automobile in the prior art need to perform a large amount of simulation work to complete the performance evaluation of the whole automobile and waste time; and the mode that only the buckle connection is simplified into the rigid body connection in the finite element analysis of the whole vehicle is replaced, the accuracy requirement of the performance analysis of the whole vehicle is met, and the accuracy of the finite element analysis of the whole vehicle is ensured.
2) The dimension reduction and simplification are carried out on the detailed finite element model of the buckle structure in the plugging and unplugging process, the simplified buckle finite element model corresponding to the first connector with only one degree of freedom in the plugging and unplugging direction or the simplified buckle finite element model corresponding to the second connector with the plugging and unplugging direction and the rotating direction around the plugging and unplugging direction are obtained, the model complexity is reduced, the finite element analysis time is greatly reduced, the calculation efficiency is improved, and the finite element analysis precision is ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art it is also possible to derive other drawings from these drawings without inventive effort.
FIG. 1 is a flow chart of a model simulation method provided in an embodiment of the present disclosure;
FIG. 2 is a flowchart of steps provided in the embodiments of the present disclosure to obtain a detailed finite element model of a buckle structure;
fig. 3 is a flowchart of steps of processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure, provided in the embodiment of the present specification;
fig. 4 is a graph of displacement versus time corresponding to the snap structure provided in the embodiments of the present disclosure;
fig. 5 is a simulation model corresponding to a first connector provided in an embodiment of the present disclosure;
FIG. 6 is a simulation model corresponding to a second connector provided in an embodiment of the present disclosure;
fig. 7 is a simulation model of a buckle structure composed of a plurality of connection units provided in the embodiments of the present disclosure;
FIG. 8 is a graph comparing a first force versus displacement curve corresponding to a detailed finite element model and a second force versus displacement curve of a simplified finite element model provided in an embodiment of the present disclosure;
FIG. 9 is a block diagram of a model simulation apparatus provided in an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a server device provided in an embodiment of the present specification.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1:
an embodiment of the present specification provides a model simulation method, as shown in fig. 1, the method includes:
s100: acquiring a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
in a specific embodiment, step S100 obtains a detailed finite element model of the snap structure, as shown in fig. 2, and previously includes:
s110: acquiring information of a buckle structure and a detailed buckle model corresponding to the buckle structure, wherein the information of the buckle structure comprises the specification of a buckle, the specification of a fixing piece, the stretching parameter of a buckle material and the tangential friction force between the buckle and the fixing piece;
the modeling of the detailed finite element model is carried out in Abaqus/explore, and because the plugging and unplugging of the buckle is a nonlinear large deformation problem, an explicit dynamics method is adopted and geometric nonlinearity is considered. The information of the buckle structure can be obtained by inquiring the specifications of the buckle material and the fixing piece material and is input into a detailed buckle model.
The friction factor needs to be considered when the buckle is in contact with the fixing piece, because the contact between the contact surface of the buckle and the contact surface of the fixing piece cannot be smooth, the contact type between the buckle and the fixing piece selects the surface to be in contact with the surface, only the tangential friction force is considered, the friction formula selects a penalty coefficient method, the isotropic directionality is adopted, the friction coefficient is determined according to the materials of the buckle and the fixing piece, the friction coefficient is set to be 0.1 in the embodiment, the contact surface which is possibly in contact between the buckle and the fixing piece is selected, the contact surface of the buckle is defined as the main surface, and the contact surface of the fixing piece is the slave surface, so that the two connecting pieces are in full contact, and the actual plugging and unplugging condition can be completely simulated.
S120: and processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure.
In a specific embodiment, step S120 is to process the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure, as shown in fig. 3, including:
s121: geometrically cleaning the detailed buckle model;
specifically, the geometry clearance is handled according to the CAD model of buckle structure, the detailed buckle model that buckle structure corresponds is the model based on the net is established through simulation software, the net can adopt tetrahedral mesh, also can adopt accurate hexahedron net, for making finite element analysis more accurate, adopt Altair Hypermesh software to carry out geometry clearance to the model, according to buckle structure and analysis structure characteristic handle fillet and the straight line that influences the grid quality, adjust the global coordinate system of model, make buckle plug direction along coordinate axis X axle direction, be convenient for set up buckle extraction power and extract the counter force output that receives.
S122: carrying out full-freedom constraint on the rear end of the fixing piece;
s123: and performing kinematic coupling on the reference point of the contact surface of the buckle and the reference point of the contact surface of the fixing piece based on the information of the buckle structure to obtain a detailed finite element model.
In a specific embodiment, the step S123, based on the information about the structure of the buckle, performs kinematic coupling between a reference point of the contact surface of the buckle and a reference point of the contact surface of the fixing part to obtain a detailed finite element model, and includes:
obtaining the clamping size between the buckle and the fixing piece according to the specification of the buckle and the specification of the fixing piece;
specifically, the clamping size between the buckle and the fixing piece can be determined according to the specification files of the buckle and the fixing piece.
Obtaining a displacement and time curve according to the clamping size between the buckle and the fixing piece;
specifically, a displacement and time curve of the buckle is set according to the size of the clamping connection between the buckle and the fixing piece, and the displacement and time curve is used for simulating the specific working condition that the buckle is pulled out of the fixing piece.
And performing kinematic coupling between a reference point of the contact surface of the buckle and a reference point of the contact surface of the fixing piece based on the curve of the displacement and the time to obtain a detailed finite element model.
Specifically, buckle structure simulation buckle plug experiment operating mode is about to carry out full degree of freedom restraint with the mounting tail end that the buckle is connected, simulates that the mounting is restrained motionless, and all nodes of the contact surface of buckle and the reference point at contact surface center carry out kinematic coupling, and kinematic coupling is a simplified mode to the contact problem in the Abaqus, only need exert the motion form that forces the displacement just can simulate whole face at the reference point.
Wherein, exert the compulsory displacement in the buckle plug direction through the reference point for the buckle can be extracted from the mounting, and retrain the degree of freedom of other directions, guarantees that the buckle only moves along buckle plug direction one direction. Since the default loading mode of the explicit dynamics method in the Abaqus is instantaneous loading, that is, a specified load is applied at the beginning of calculation, a "ramp loading" mode needs to be set when a forced displacement is applied, that is, a displacement-time curve is added, as shown in fig. 4, so as to obtain a detailed finite element model corresponding to the buckle structure capable of performing a kinematic coupling process. The ordinate of the initial position of the curve corresponds to the clamping size between the buckle and the fixing piece, the buckle is separated from the fixing piece after moving in the X direction for a certain distance, and the distance is the clamping size between the buckle and the fixing piece.
S200: obtaining a first force and displacement curve of the buckle when the buckle is plugged in and pulled out of the fixed piece according to the detailed finite element model;
in a specific embodiment, the step S200 of obtaining a first force and displacement curve of the clip when the clip is inserted into or pulled out from the fixing element according to the detailed finite element model includes:
obtaining a force and displacement curve corresponding to the detailed finite element model according to the detailed finite element model;
acquiring a force and displacement curve of a buckle structure in a plugging and unplugging experiment;
determining the consistency of the force and the displacement curve corresponding to the detailed finite element model and the force and the displacement curve of the buckle structure in the plugging and unplugging experiment;
and when the consistency degree is higher than a first preset value, the force and displacement curve corresponding to the detailed finite element model is a first force and displacement curve.
Specifically, because the buckle material is plastics, so the general frock clamp of tensile testing machine is unsuitable to be used for pressing from both sides tight plastics buckle, appears the buckle easily because the too big fracture that produces of the power of both sides clamping. And the degree of freedom of plug direction is only considered in the buckle plug, and other direction degrees of freedom are fixed by the tool clamp, so that the degree of freedom except for the plug direction in the buckle plug test can not move, and the accuracy of the test is ensured.
And testing the plugging and unplugging force of the plastic buckle connection process of the vehicle body through a buckle plugging and unplugging test to obtain a force and displacement curve corresponding to each model, and comparing a finite element analysis result with the curve obtained by the test. And calibrating a detailed finite element model of the buckle structure based on test data, and ensuring that the consistency degree of the insertion and extraction force analysis and the test reaches above a first preset value, wherein a force and displacement curve corresponding to the detailed finite element model is a first force and displacement curve, and the first preset value is 80%.
S300: correcting the first force and displacement curve to obtain a second force and displacement curve;
and setting the force after the buckle and the fixing piece are separated to be 0 in the force and displacement curve to obtain a second force and displacement curve.
S400: creating a simplified buckle model corresponding to the buckle structure based on a connection unit;
specifically, as shown in fig. 5 and 6, the connection unit is a first connector or a second connector, the first connector is movable in an inserting and pulling direction thereof, and the second connector is movable in an inserting and pulling direction of the second connector and rotatable in a rotating direction around the inserting and pulling direction.
It should be noted that, in general, in the finite element analysis of the whole vehicle, only the connection between the buckle and the fixing piece is simplified into the rigid connection, that is, the displacement and the failure of the buckle are not considered, which has a certain influence on the evaluation of the safety and the comfort of the whole vehicle, so that it is necessary to perform more accurate analysis on the buckle and the fixing piece. For displacement change and failure of some buckles generated in the plugging and unplugging process, which only relate to force in the plugging and unplugging direction, the dimension reduction and simplification of a detailed finite element model for plugging and unplugging the buckles can be considered, wherein the detailed finite element model is a three-dimensional model and is reduced from the three-dimensional model (with six degrees of freedom) to a model with only one degree of freedom (capable of moving only in the X direction), namely a model of a first connector, wherein the X direction is the plugging and unplugging direction of the buckles, for example, a Translator connector in FIG. 5, so that the calculation efficiency can be greatly improved on the premise of ensuring the accuracy; meanwhile, for some buckles considering not only the plugging direction but also the twisting direction, a detailed finite element model corresponding to the buckle structure can be simplified into a second connector, such as a Cylindrical connector in fig. 6, such a connector can simulate not only the force in the plugging direction but also the force in the twisting direction (rotating direction) around the plugging direction, and the twisting direction (rotating direction) is the rotating direction which is located in a plane perpendicular to the X direction and takes the X direction as an axis. The detailed finite element model of the macroscopic buckle is simplified into the connecting unit, the dimension reduction of the degree of freedom of the model and the reduction of the complexity of the model are realized, a force and displacement curve obtained by the detailed model through finite element analysis is corrected and applied to the connecting unit, the connecting unit is used for replacing the buckle to connect two parts, the analysis and calculation time can be greatly shortened, and the analysis precision is ensured.
Firstly, carrying out finite element analysis on all different buckle structures on the whole vehicle once, establishing a database of force and displacement curves of the buckle structures, then simplifying the database into a first connector or a second connector according to the working condition of each buckle structure, and assigning the force and displacement curves of the corresponding buckle structures to the corresponding connectors as the mechanical characteristics of the buckles, so that the calculated amount can be reduced by carrying out the finite element analysis on the whole vehicle, and later, a new vehicle type can be assigned to the connectors by directly using the database as long as the buckle structures are unchanged.
In some other embodiments, multiple connection units may be used for simulation, as shown in fig. 7, so that forces in multiple directions can be simulated.
S500: obtaining a simplified finite element model according to the second force and displacement curve and the simplified buckle model, wherein the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
s600: and adding the simplified finite element model to a database of the finished automobile to complete finite element analysis of the finished automobile.
In a specific embodiment, the step S500 of obtaining a simplified finite element model according to the second force-displacement curve and the simplified snap model includes:
obtaining a finite element model according to the second force and displacement curve and the simplified buckle model;
determining the precision of the second force and displacement curve according to the first force and displacement curve and the second force and displacement curve;
and when the precision is higher than a second preset value, the finite element model is a simplified finite element model.
Specifically, the force and displacement curve obtained by the detailed finite element model is given to the simplified buckle model corresponding to the connection unit, and the force and displacement curve of the simplified finite element model after the detailed finite element model is modified can be obtained by applying the working condition borne by the detailed finite element model, as shown in fig. 8, it can be seen by comparing the graphs that the force and displacement curve obtained by the detailed finite element model and the force and displacement curve of the simplified finite element model are basically superposed, and the consistency degree of the result reaches more than 90%, namely the connection unit can well simulate the force and displacement curve obtained by the detailed finite element model.
The force and displacement curve obtained by carrying out the detailed finite element model and the force and displacement curve of the simplified finite element model can be compared according to software, and the precision, namely the consistency degree, of the second force and displacement curve relative to the first force and displacement curve is obtained.
And adding the simplified finite element model into a database of the whole vehicle analysis, simplifying the buckles on the vehicle body into different connecting units according to different types, giving corresponding force and displacement curves, and finally performing the whole vehicle finite element analysis to complete the whole vehicle performance analysis.
Principle of finite element analysis of the whole vehicle:
firstly, classifying all buckle structures on the whole vehicle, and carrying out detailed finite element modeling on each buckle structure, wherein the detailed finite element modeling means that geometric cleaning is carried out firstly according to a CAD (computer-aided design) model of the buckle structure;
after the detailed finite element modeling is completed, finite element analysis is started, a force and displacement curve of the buckle structure in the finite element analysis is output from software (of course, for the buckle structure only in the plugging and unplugging direction, if a twisting direction exists, an angle and moment curve are output from the software), the force and displacement curve can embody the mechanical characteristics of the buckle structure, but this force versus displacement curve from the software contains some of the force after the buckle is pulled from the mount, this force is due to the force generated by the snap in the deformed state, which has no effect on simplifying the snap model, so the force of the curve after being pulled out is set to 0, which can be intuitively understood as that since the buckle is pulled out and is definitely not stressed, therefore, force and displacement curves of different buckle structures are obtained according to the mechanical characteristics of the different buckle structures;
and establishing a database, simplifying the model according to the working condition of the buckle, simplifying the first connecting unit or the second connecting unit, and then directly giving the corresponding force and displacement curve to the corresponding simplified buckle model to perform finite element analysis. Because the force and displacement curve of the simplified buckle model is the force and displacement curve of the detailed buckle model, the result obtained by the finite element analysis of the simplified model is basically consistent with the result obtained by the finite element analysis of the detailed model;
when the whole vehicle is subjected to finite element analysis, various simplified buckle models of the buckle structure can be directly simplified, corresponding force and displacement curves are selected from a database, and when the buckle structure with a new structure appears, the force and displacement curves are recalculated and added into the database.
An embodiment of the present specification further provides a model simulation apparatus, as shown in fig. 9, the apparatus includes:
detailed finite element model acquisition module 1001: the method comprises the steps of obtaining a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
the first force versus displacement curve obtaining module 1002: the first force and displacement curve when the buckle is plugged in and pulled out of the fixed piece is obtained according to the detailed finite element model;
the second force versus displacement curve obtaining module 1003: the first force and displacement curve is corrected to obtain a second force and displacement curve;
the simplified snap model creation module 1004: the simplified buckle model is used for creating a corresponding buckle structure based on a connecting unit;
the simplified finite element model is obtained at block 1005: the simplified finite element model is obtained according to the second force and displacement curve and the simplified buckle model, and the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
finished automobile finite element analysis module 1006: and the method is used for adding the simplified finite element model to a database of the finished automobile to complete the finite element analysis of the finished automobile.
The present specification also provides an apparatus including a processor and a memory, where at least one instruction, at least one program, a set of codes, or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the model simulation method in embodiment 1.
Specifically, please refer to fig. 10 for a schematic structural diagram of a server device provided in an embodiment of the present specification. The server is used for implementing the model simulation method provided in the above embodiment. Specifically, the method comprises the following steps:
the server 2000 includes a Central Processing Unit (CPU)2001, a system memory 2004 including a Random Access Memory (RAM)2002 and a Read Only Memory (ROM)2003, and a system bus 2005 connecting the system memory 2004 and the central processing unit 2001. The server 2000 also includes a basic input/output system (I/O system) 2006 to facilitate transfer of information between devices within the computer, and a mass storage device 2007 to store an operating system 2013, application programs 2014, and other program modules 2015.
The basic input/output system 2006 includes a display 2008 for displaying information and an input device 2009 such as a mouse, keyboard, etc. for a user to input information. Wherein the display 2008 and the input devices 2009 are coupled to the central processing unit 2001 through an input-output controller 2010 coupled to the system bus 2005. The basic input/output system 2006 may also include an input/output controller 2010 for receiving and processing input from a number of other devices, such as a keyboard, mouse, or electronic stylus. Similarly, the input-output controller 2010 also provides output to a display screen, a printer, or other type of output device.
The mass storage device 2007 is connected to the central processing unit 2001 through a mass storage controller (not shown) connected to the system bus 2005. The mass storage device 2007 and its associated computer-readable media provide non-volatile storage for the server 2000. That is, the mass storage device 2007 may include a computer-readable medium (not shown) such as a hard disk or CD-ROM drive.
Without loss of generality, the computer-readable media may comprise computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, EPROM, EEPROM, flash memory or other solid state memory technology, CD-ROM, DVD, or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. Of course, those skilled in the art will appreciate that the computer storage media is not limited to the foregoing. The system memory 2004 and mass storage device 2007 described above may be collectively referred to as memory.
The server 2000 may also operate as a remote computer connected to a network via a network, such as the internet, according to various embodiments of the present invention. That is, the server 2000 may be connected to the network 2012 through a network interface unit 2011 that is coupled to the system bus 2005, or the network interface unit 2011 may be utilized to connect to other types of networks or remote computer systems (not shown).
The memory also includes one or more programs stored in the memory and configured to be executed by one or more processors; the one or more programs include instructions for performing the method of the backend server side.
Embodiments of the present invention also provide a computer storage medium, which may be disposed in a client to store at least one instruction, at least one program, a code set, or a set of instructions related to implementing a model simulation method in the method embodiments, where the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by the processor to implement the model simulation method provided in the method embodiments.
Optionally, in this embodiment, the storage medium may be located in at least one network device of a plurality of network devices of a computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
It should be noted that: the sequence of the embodiments in this specification is merely for description, and does not represent the advantages or disadvantages of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the acts or steps loaded in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the device and server embodiments, since they are substantially similar to the method embodiments, the description is simple, and the relevant points can be referred to the partial description of the method embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of model simulation, the method comprising:
acquiring a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
obtaining a first force and displacement curve of the buckle when the buckle is plugged in and pulled out of the fixed piece according to the detailed finite element model;
correcting the first force and displacement curve to obtain a second force and displacement curve;
creating a simplified buckle model corresponding to the buckle structure based on a connection unit;
obtaining a simplified finite element model according to the second force and displacement curve and the simplified buckle model, wherein the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
and adding the simplified finite element model to a database of the finished automobile to complete finite element analysis of the finished automobile.
2. The model simulation method according to claim 1, wherein the connection unit is a first connector movable in its plugging and unplugging direction or a second connector movable in its plugging and unplugging direction and rotatable in a rotation direction around the plugging and unplugging direction.
3. The model simulation method of claim 1, wherein obtaining a detailed finite element model of a snap structure previously comprises:
acquiring information of a buckle structure and a detailed buckle model corresponding to the buckle structure, wherein the information of the buckle structure comprises the specification of a buckle, the specification of a fixing piece, the stretching parameter of a buckle material and the tangential friction force between the buckle and the fixing piece;
and processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure.
4. The model simulation method of claim 3, wherein processing the detailed buckle model according to the information of the buckle structure to obtain a detailed finite element model corresponding to the buckle structure comprises:
geometrically cleaning the detailed buckle model;
carrying out full-freedom constraint on the rear end of the fixing piece;
and performing kinematic coupling on the reference point of the contact surface of the buckle and the reference point of the contact surface of the fixing piece based on the information of the buckle structure to obtain a detailed finite element model.
5. The model simulation method of claim 4, wherein the kinematic coupling of the reference point of the contact surface of the buckle and the reference point of the contact surface of the fixture based on the information of the buckle structure results in a detailed finite element model, comprising:
obtaining the clamping size between the buckle and the fixing piece according to the specification of the buckle and the specification of the fixing piece;
obtaining a displacement and time curve according to the clamping size between the buckle and the fixing piece;
and performing kinematic coupling between a reference point of the contact surface of the buckle and a reference point of the contact surface of the fixing piece based on the curve of the displacement and the time to obtain a detailed finite element model.
6. The model simulation method of claim 1, wherein modifying the force versus displacement curve to obtain a second force versus displacement curve comprises:
and setting the force after the buckle and the fixing piece are separated to be 0 in the force and displacement curve to obtain a second force and displacement curve.
7. The model simulation method of claim 1, wherein obtaining a first force and displacement curve of the clip when being inserted and extracted on the fixing member according to the detailed finite element model comprises:
obtaining a force and displacement curve corresponding to the detailed finite element model according to the detailed finite element model;
acquiring a force and displacement curve of a buckle structure in a plugging and unplugging experiment;
determining the consistency of the force and the displacement curve corresponding to the detailed finite element model and the force and the displacement curve of the buckle structure in the plugging and unplugging experiment;
and when the consistency degree is higher than a first preset value, the force and displacement curve corresponding to the detailed finite element model is a first force and displacement curve.
8. The model simulation method of claim 7, wherein deriving a simplified finite element model from the second force versus displacement curve and the simplified snap model comprises:
obtaining a finite element model according to the second force and displacement curve and the simplified buckle model;
determining the precision of the second force and displacement curve according to the first force and displacement curve and the second force and displacement curve;
and when the precision is higher than a second preset value, the finite element model is a simplified finite element model.
9. A model simulation apparatus, the apparatus comprising:
a detailed finite element model acquisition module: the method comprises the steps of obtaining a detailed finite element model of a buckle structure, wherein the buckle structure comprises a buckle and a fixing piece;
a first force versus displacement curve obtaining module: the first force and displacement curve when the buckle is plugged in and pulled out of the fixed piece is obtained according to the detailed finite element model;
a second force versus displacement curve deriving module: the first force and displacement curve is corrected to obtain a second force and displacement curve;
the simplified buckle model creation module: the simplified buckle model is used for creating a corresponding buckle structure based on a connecting unit;
simplifying the finite element model to obtain a module: the simplified finite element model is obtained according to the second force and displacement curve and the simplified buckle model, and the degree of freedom of the simplified finite element model is smaller than that of the detailed finite element model;
finished automobile finite element analysis module: and the method is used for adding the simplified finite element model to a database of the finished automobile to complete the finite element analysis of the finished automobile.
10. An apparatus comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, the at least one instruction, the at least one program, the set of codes, or the set of instructions being loaded and executed by the processor to implement the model simulation method of any of claims 1-8.
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