CN112417605A - Vehicle door predeformation analysis method, system, terminal and storage medium - Google Patents
Vehicle door predeformation analysis method, system, terminal and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a system, a terminal and a computer readable storage medium for analyzing vehicle door predeformation, wherein the method comprises the following steps: constructing a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door; defining material parameters of each part in the finite element model of the vehicle door; defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model; applying a loading force to a loading node in the finite element model of the vehicle door along a loading direction; and setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door. The method solves the problem of low accuracy of the measurement result in the conventional method for testing the pre-deformation of the vehicle door by using the displacement sensor.
Description
Technical Field
The invention relates to the field of simulation, in particular to a method, a system, a terminal and a computer-readable storage medium for analyzing vehicle door predeformation.
Background
When the automobile door is in a closed state, the first adhesive tape and the door opening adhesive tape can generate sealing acting force on the window frame on the automobile door, and the corresponding position of the window frame can generate corresponding deformation by the sealing acting force. In designing the door structure, it is necessary to adjust the design state of the door in consideration of this deformation so as to ensure that the position, clearance, sealing property, etc. of the door on the actual vehicle match the optimum state.
The method for examining the pre-deformation of the automobile door and window frame under the sealing force of the rubber strip is to use a bench test to examine after the automobile door sample is taken out, fix the automobile door sample according to the real automobile condition through a clamp, arrange the measuring points according to the automobile door structure, connect a displacement sensor, a data acquisition system and other related equipment, gradually load the design load at the positions of a first rubber strip and a door opening rubber strip, and simulate the stress condition of the automobile door under the sealing force. And finally, processing the displacement data acquired by the data acquisition system, and checking the deformation trend and size of the door and window frame. However, the displacement sensor in the method is installed by a tester, and the position of the displacement sensor is not completely consistent with the actual distribution position, so that the result is deviated.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a vehicle door predeformation analysis method, a vehicle door predeformation analysis system, a vehicle door predeformation terminal and a computer readable storage medium, and aims to solve the problem of low accuracy of a measurement result in the conventional vehicle door predeformation testing method by using a displacement sensor.
In order to achieve the above object, the present application provides a door pre-deformation analysis method, including the steps of:
constructing a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door;
defining material parameters of each part in the finite element model of the vehicle door;
defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model;
applying a loading force to a loading node in the finite element model of the vehicle door along a loading direction;
and setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door.
Optionally, the step of constructing a door finite element model without a seal strip according to the door three-dimensional model comprises:
and carrying out geometric cleaning and meshing on the three-dimensional model of the vehicle door to generate a finite element model of the vehicle door without the sealing strip.
Optionally, the step of performing geometric cleaning and meshing on the three-dimensional model of the vehicle door and generating the finite element model of the vehicle door without the sealing strip includes:
carrying out geometric cleaning and meshing on the three-dimensional model of the vehicle door to obtain an initial vehicle door finite element model without a sealing strip;
checking the grid unit of the initial vehicle door finite element model according to a grid checking standard;
adjusting the grid unit which is checked to be unqualified;
and taking the adjusted initial door finite element model as a door finite element model.
Optionally, the step of defining constraint degree of freedom parameters of a body side hinge and a door lock center in the door finite element model comprises:
the degrees of freedom in three rotation directions and three translation directions are restricted for the vehicle body side hinge;
the degrees of freedom in two rotational directions and two translational directions are constrained to the door lock center.
Optionally, the door finite element model corresponds to a plurality of sections of rubber strips, and the step of applying a loading force to a loading node in the door finite element model along a loading direction includes:
constructing a loading node set in a vehicle door finite element model corresponding to each section of rubber strip;
calculating the loading force of a loading node in the vehicle door finite element model corresponding to each section of rubber strip;
determining the loading direction of a loading node in the vehicle door finite element model corresponding to each section of rubber strip;
and automatically applying a loading force to the loading nodes in the door finite element model along the loading direction according to an automatic loading load program written based on the TCL scripting language, the loading node set in the door finite element model corresponding to each section of rubber strip, and the loading direction and the loading force of the loading nodes.
Optionally, the step of calculating the loading force of the loading node in the door finite element model corresponding to each section of rubber strip includes:
according to a preset loading force calculation formula, the number of loading nodes in the vehicle door finite element model corresponding to each section of rubber strip, the length of each section of rubber strip and the load of unit length, calculating the loading force of the loading nodes in the vehicle door finite element model corresponding to each section of rubber strip, wherein the preset loading force calculation formula is as follows:
f is the loading power of loading node in the door finite element model that the adhesive tape corresponds, and K is the load of adhesive tape unit length, and L is adhesive tape length, and N is the loading node quantity in the door finite element model that the adhesive tape corresponds.
Optionally, the step of invoking a solver to perform simulation calculation on the finite element model of the vehicle door, and obtaining the pre-deformation analysis result of the vehicle door includes:
judging whether the vehicle door three-dimensional model needs to be optimized or not according to the vehicle door predeformation analysis result;
and when the fact that the three-dimensional model of the vehicle door needs to be optimized is determined, optimizing the three-dimensional model of the vehicle door, and returning to the step of executing the step of constructing the finite element model of the vehicle door without the sealing strip according to the three-dimensional model of the vehicle door until the fact that the three-dimensional model of the vehicle door does not need to be optimized is determined.
In order to achieve the above object, the present invention also provides a door pre-deformation analysis system, including:
the building module is used for building a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door;
the first defining module is used for defining the material parameters of each part in the finite element model of the vehicle door;
the second definition module is used for defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in the vehicle door finite element model;
the applying module is used for applying loading force to a loading node in the vehicle door finite element model along a loading direction;
and the calculation module is used for setting a solving mode and solving parameters of the solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door so as to obtain a pre-deformation analysis result of the vehicle door.
In addition, to achieve the above object, the present invention also provides a terminal, including: a communication module, a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the door pre-deformation analysis method as described above.
In addition, to achieve the above object, the present invention further provides a computer readable storage medium having a computer program stored thereon, the computer program, when being executed by a processor, implementing the steps of the door pre-deformation analysis method as described above.
According to the door pre-deformation analysis method, the system, the terminal and the computer readable storage medium, a door finite element model without a sealing strip is constructed according to a door three-dimensional model; defining material parameters of each part in the finite element model of the vehicle door; defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model; applying a loading force to a loading node in the finite element model of the vehicle door along a loading direction; and setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door. Therefore, the door pre-deformation result can be determined by directly utilizing a finite element analysis method, a door sample is not needed, the analysis cost is reduced, and a displacement sensor is not needed to be installed, so that the deviation of the pre-deformation analysis result caused by the inaccurate placement position of the displacement sensor is avoided.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a door pre-deformation analysis method of the present invention;
FIG. 3 is a detailed flowchart of step S10 of the method for analyzing pre-deformation of a vehicle door according to the present invention;
FIG. 4 is a detailed flowchart of step S40 of the method for analyzing door pre-deformation according to the present invention;
FIG. 5 is a schematic flow chart of a second embodiment of a door pre-deformation analysis method of the present invention;
fig. 6 is a functional block diagram of the door pre-deformation analysis system of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a terminal provided in various embodiments of the present invention, where the terminal is a processing device, such as a computer device, and may be connected to any refrigeration device or user input device, and includes components such as a communication module 10, a memory 20, and a processor 30. Those skilled in the art will appreciate that the terminal shown in fig. 1 may also include more or fewer components than shown, or combine certain components, or a different arrangement of components. Wherein, the processor 30 is connected to the memory 20 and the communication module 10, respectively, and the memory 20 stores thereon a computer program, which is executed by the processor 30 at the same time.
The communication module 10 may be connected to an external device through a network. The communication module 10 can receive data from an external device and can also send data, commands and information to the external device. The external device can be an electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer and the like.
The memory 20 may be used to store software programs as well as various data. The memory 20 may mainly include a storage program area and a storage data area, where the storage program area may store an operating system, an application program required by at least one function (a solver is called to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door), and the like; the storage data area may store data or information created according to the use of the terminal, or the like. Further, the memory 20 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 30, which is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 20 and calling data stored in the memory 20, thereby performing overall monitoring of the terminal. Processor 30 may include one or more processing units; preferably, the processor 30 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 30.
Although not shown in fig. 1, the terminal may further include a circuit control module, which is used for being connected to a mains supply to implement power control and ensure normal operation of other components.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the door pre-deformation analysis method of the present invention, the door pre-deformation analysis method includes the steps of:
step S10, constructing a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door;
since the purpose of this embodiment is to analyze the pre-deformation of the door in the closed door state, in order to improve the calculation efficiency and result accuracy at the same time, in this embodiment, the three-dimensional model of the vehicle body is intercepted to obtain the three-dimensional model of the door, and then the three-dimensional model of the door is geometrically cleaned and gridded to establish a door finite element model without an adhesive tape. In the finite element model of the vehicle door, a shell unit is adopted for a sheet metal part, a solid unit is adopted for simulation of a hinge and a viscose, an ACM unit is adopted for simulation in spot welding, and an RBE2 unit is adopted for simulation in seam welding. The average length of the shell elements in the finite element model was 8 mm.
Specifically, referring to fig. 3, fig. 3 is a detailed schematic view of a flow of step S10 in an embodiment of the present application, and based on the embodiment, step S10 includes:
step S11, carrying out geometric cleaning and grid division on the three-dimensional model of the vehicle door to obtain an initial vehicle door finite element model without a sealing strip;
step S12, checking the grid cells of the initial door finite element model according to the grid checking standard;
step S13, adjusting the grid unit which is not qualified;
and step S14, taking the adjusted initial door finite element model as a door finite element model.
In the present embodiment, it is preferred that,
firstly, cleaning a geometric model based on general preprocessing software Hypermesh, specifically comprising connecting discontinuous surfaces, removing superposed surfaces, removing tiny characteristics which do not influence results, neglecting holes with the diameter D less than 5mm, chamfering, bending and flanging characteristics and the like.
And secondly, carrying out mesh division in the Hypermesh based on the preprocessing software to obtain an initial door finite element model, wherein the average size of the whole mesh of the initial finite element model is controlled to be 8 mm. Sheet metal part division is generally represented by four-node linear shell elements. To prevent the geometric deformation from being too large, it is also possible to divide locally with a three-node cell, in any case the triangular cell as a whole cannot exceed 5% of the total number of cells. And after the grid division is finished, checking the grids of the initial door finite element model according to a pre-established grid checking standard, wherein the grid checking standard is shown in table 1, all the grid units which are finally adjusted to be unqualified are qualified, and the initial door finite element model which is adjusted to be qualified is used as a final analysis object.
TABLE 1 grid inspection Standard
| Criterion | value |
| min length | 4 |
| average length | 8 |
| max length | 15 |
| warpage | <12° |
| max angle quad | 135° |
| min angle quad | 45° |
| max angle tria | 120° |
| min angle tria | 20° |
| jacobian | >0.6 |
| ％of trias | <5％ |
| aspect ratio | 5 |
Step S20, defining material parameters of each component in the finite element model of the vehicle door;
after the vehicle door finite element model is built, defining the material properties of each part in the vehicle door finite element model according to linear materials, namely defining the Young modulus, the Poisson ratio and the density of each part.
Step S30, defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model;
the door has two side hinges and a door lock center, the freedom degrees of three rotation directions and three translation directions are restricted for the side hinge of the vehicle body in the door finite element model, the freedom degrees of two rotation directions and two translation directions are restricted for the door lock center in the door finite element model, namely the door lock is not restricted by the translation and rotation freedom degrees in the length direction.
Step S40, applying a loading force to a loading node in the door finite element model along a loading direction;
according to the position of a sealing strip on the vehicle door and the structure of the vehicle door, determining a loading node which needs to apply loading force in a finite element model of the vehicle door, determining the loading force and the loading direction of the loading node, and applying corresponding loading force to the determined loading node along the determined loading direction.
Specifically, referring to fig. 4, fig. 4 is a detailed schematic view of a flow of step S40 in an embodiment of the present application, and based on the embodiment, the step S40 includes:
step S41, constructing a loading node set in the vehicle door finite element model corresponding to each section of rubber strip;
step S42, calculating the loading force of the loading node in the vehicle door finite element model corresponding to each section of rubber strip;
step S43, determining the loading direction of the loading node in the vehicle door finite element model corresponding to each section of rubber strip;
and step S44, automatically applying a loading force to the loading nodes in the door finite element model along the loading direction according to an automatic loading load program written based on the TCL scripting language, the loading node set in the door finite element model corresponding to each section of rubber strip, and the loading direction and the loading force of the loading nodes.
In this embodiment, a door may have a plurality of sections of rubber strips, that is, a door finite element model corresponds to a plurality of sections of rubber strips, for example, a front door has two sections of rubber strips, and each section of rubber strip is divided into a first rubber strip section and a door opening rubber strip section. Before the loading force is applied, for convenience in loading and result post-processing, the loading nodes corresponding to each section of rubber strip can be established in a corresponding node set, for example, if a front vehicle door has a first rubber strip section, a door opening rubber strip section, a first rubber strip section and a door opening rubber strip section, 4 node sets are established, and each node set stores the loading nodes corresponding to the corresponding section of rubber strip.
In order to avoid the complexity of a nonlinear model of a sealing strip and the problems of model precision and calculation efficiency caused by nonlinear factors, the balance between simulation analysis precision and analysis efficiency is considered, the sealing force of the rubber strip is averagely applied to each node by using a design load, specifically, the number of loading nodes in a vehicle door finite element model corresponding to each section of the rubber strip and the load of the length and unit length of the section of the rubber strip are input into a preset loading force calculation formula, and the loading force of the loading nodes in the vehicle door finite element model corresponding to each section of the rubber strip is calculated and obtained, wherein the preset loading force calculation formula is as follows:
f is the loading force of loading node in the door finite element model that the adhesive tape corresponds, and the unit is N, and L is adhesive tape length, and the unit is mm, and K is the load of adhesive tape unit length, and the unit is N/mm, and the load of the unit length of the adhesive tape of different sections is different, and N is the loading node quantity in the door finite element model that the adhesive tape corresponds.
The stress direction of the loading node at the sealing strip of the vehicle door has two directions, the first direction is along the normal direction of a unit connected with the loading node, the connected unit is on a finite element model of the vehicle door, and the second direction is from the node closest to the loading point to the loading node in each node of the sheet metal part closest to the loading point on the vehicle body in a closed door state. Before determining the direction of the loading node corresponding to each section of rubber strip, determining the type of the loading direction of the loading node corresponding to each section of rubber strip according to the different positions of the loading nodes corresponding to each section of rubber strip.
Therefore, when the loading direction of the loading node corresponding to a certain section of rubber strip is determined to be of the first type, the grid units connected with the loading node corresponding to the section of rubber strip are established in the first temporary set corresponding to the section of rubber strip, then the normal direction of each grid unit in the first temporary set is adjusted to point to the inside of the vehicle door, and finally the mapping relation is established between the first temporary set and the corresponding loading node set.
When the loading direction of the loading node corresponding to a certain section of rubber strip is determined to be of the second type, the node closest to the loading node in all nodes of the sheet metal part closest to the loading point on the vehicle body in the door closing state can be stored in the second temporary set corresponding to the section of rubber strip.
And finally, running the compiled TCL program code in the Hypermesh, selecting a node set to be loaded, automatically querying a corresponding temporary set according to the loaded node set so as to determine the loading direction of the loaded node set, and then inputting the loading force of the loaded node set, so that the loading of the sealing force of the adhesive tape can be realized.
It should be noted that before determining the loading direction, a local coordinate system is also established for each loading node, so that the determined loading direction is a loading direction with reference to the local coordinate system of the corresponding loading node.
In the embodiment, aiming at the problems that the adhesive tape and the vehicle door have more action points and inconsistent action directions, the secondary development is carried out on the Hypermesh preprocessing software based on the TCL language for improving the precision and effectiveness of the application of the sealing force, the primary batch effective loading of the sealing force is realized by programming, and the loaded position, direction and size can be freely realized by the secondary development program without being limited by the number of the loading points.
And S50, setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door.
And setting the solving mode of the solver as linear solving, setting the solving parameter as displacement, outputting the finite element model of the vehicle door as a document of 'bdf', opening a NASTRAN to submit calculation, or calling the NASTRAN solver to submit calculation through a batch processing command, and obtaining the pre-deformation analysis result of the vehicle door.
According to the method, a finite element model of the vehicle door without the sealing strip is constructed according to the three-dimensional model of the vehicle door; defining material parameters of each part in the finite element model of the vehicle door; defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model; applying a loading force to a loading node in the finite element model of the vehicle door along a loading direction; and setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door. Therefore, the door pre-deformation result can be determined by directly utilizing a finite element analysis method, a door sample is not needed, the analysis cost is reduced, and a displacement sensor is not needed to be installed, so that the deviation of the pre-deformation analysis result caused by the inaccurate placement position of the displacement sensor is avoided.
Further, referring to fig. 5, fig. 5 is a diagram illustrating a second embodiment of the door pre-deformation analysis method according to the first embodiment of the door pre-deformation analysis method, in this embodiment, the step S50 includes:
step S60, judging whether the vehicle door three-dimensional model needs to be optimized according to the vehicle door pre-deformation analysis result;
and step S70, when the door three-dimensional model is determined to need to be optimized, optimizing the door three-dimensional model, and returning to execute the step S10 until the door three-dimensional model is determined not to need to be optimized.
After the door is subjected to primary predeformation analysis, an analysis result is obtained, whether the position, the gap, the sealing property and the like of the door on a real vehicle are matched to the optimal state or not can be determined according to the predeformation analysis result, if the position, the gap, the sealing property and the like of the door on the real vehicle are not matched to the optimal state, the three-dimensional model of the door needs to be optimized, the position, the shape, the material property and the like of a sealing strip on the door can be optimized, the shape and the structure of a sheet metal part on the door can be optimized, and the optimization means is not limited. After the optimization, the optimized vehicle door three-dimensional model is subjected to pre-deformation analysis by adopting the pre-deformation analysis method provided by the invention. Until it is determined that the three-dimensional model of the door does not require optimization.
When it is determined from the result of the pre-deformation analysis that the position, the gap, the sealing property, and the like of the door on the actual vehicle are in the optimum state, the three-dimensional model of the door is directly used as the final product model.
Referring to fig. 6, the present invention also provides a door pre-deformation analysis system, comprising:
the building module 10 is used for building a door finite element model without a sealing strip according to the door three-dimensional model;
a first defining module 20 for defining material parameters of components in the finite element model of the vehicle door;
a second defining module 30, configured to define constraint freedom parameters of a body side hinge and a door lock center in the door finite element model;
the applying module 40 is used for applying loading force to a loading node in the finite element model of the vehicle door along a loading direction;
and the calculation module 50 is used for setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door.
Further, the building module 10 includes:
and the generating unit 11 is used for performing geometric cleaning and meshing on the three-dimensional model of the vehicle door to generate a finite element model of the vehicle door without a sealing strip.
Further, the generating unit 11 includes:
the obtaining subunit 111 is configured to perform geometric cleaning and meshing on the vehicle door three-dimensional model to obtain an initial vehicle door finite element model without a sealing strip;
an inspection subunit 112, configured to inspect the mesh unit of the initial door finite element model according to a mesh inspection standard;
and an adjusting subunit 113, configured to adjust the grid unit that is not qualified, and use the adjusted initial door finite element model as the door finite element model.
Further, the second defining module 30 includes:
a first restraint unit 31 for restraining the degrees of freedom in three rotational directions and three translational directions with respect to the vehicle body side hinge;
and a second restriction unit 32 for restricting the degrees of freedom of the two rotational directions and the two translational directions with respect to the door lock center.
Further, the door finite element model corresponds to a multi-segment adhesive tape, and the applying module 40 includes:
the construction unit 41 is used for constructing a loading node set in the vehicle door finite element model corresponding to each section of rubber strip;
the calculating unit 42 is used for calculating the loading force of the loading node in the vehicle door finite element model corresponding to each section of rubber strip;
the determining unit 43 is configured to determine a loading direction of a loading node in the vehicle door finite element model corresponding to each section of rubber strip;
and the applying unit 44 is used for automatically applying the loading force to the loading nodes in the door finite element model along the loading direction according to the automatic loading load program written based on the TCL scripting language, the loading node set in the door finite element model corresponding to each section of rubber strip, and the loading direction and the loading force of the loading nodes.
Further, the calculating unit 42 is further configured to calculate a loading force of a loading node in the door finite element model corresponding to each section of rubber strip according to a preset loading force calculation formula, the number of loading nodes in the door finite element model corresponding to each section of rubber strip, and the length of each section of rubber strip and the load of unit length, where the preset loading force calculation formula is:
f is KxL/N, F is the loading force of loading nodes in the door finite element model corresponding to the rubber strip, K is the load of the unit length of the rubber strip, and N is the number of the loading nodes in the door finite element model corresponding to the rubber strip
Further, the door pre-deformation analysis further comprises:
the judging module 60 is used for judging whether the vehicle door three-dimensional model needs to be optimized or not according to the vehicle door pre-deformation analysis result;
and the optimizing module 70 is configured to optimize the vehicle door three-dimensional model if the determination result is positive, and return to the step of executing the step of constructing the vehicle door finite element model without the sealing strip according to the vehicle door three-dimensional model until it is determined that the vehicle door three-dimensional model does not need to be optimized.
The invention also proposes a computer-readable storage medium on which a computer program is stored. The computer-readable storage medium may be the Memory 20 in the terminal of fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several pieces of information for enabling the terminal to perform the method according to each embodiment of the method for analyzing the door pre-deformation in the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A vehicle door predeformation analysis method is characterized by comprising the following steps:
constructing a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door;
defining material parameters of each part in the finite element model of the vehicle door;
defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in a vehicle door finite element model;
applying a loading force to a loading node in the finite element model of the vehicle door along a loading direction;
and setting a solving mode and solving parameters of a solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door to obtain a pre-deformation analysis result of the vehicle door.
2. The door pre-deformation analysis method of claim 1, wherein the step of constructing a door finite element model without a weatherstrip from a three-dimensional model of a door comprises:
and carrying out geometric cleaning and meshing on the three-dimensional model of the vehicle door to generate a finite element model of the vehicle door without the sealing strip.
3. The door pre-deformation analysis method of claim 2, wherein the step of geometrically cleaning and meshing the three-dimensional model of the door to generate the finite element model of the door without the seal strip comprises:
carrying out geometric cleaning and meshing on the three-dimensional model of the vehicle door to obtain an initial vehicle door finite element model without a sealing strip;
checking the grid unit of the initial vehicle door finite element model according to a grid checking standard;
and adjusting the grid units which are not qualified in the inspection, and taking the adjusted initial door finite element model as a door finite element model.
4. A method for door pre-deformation analysis as set forth in claim 3, wherein said step of defining constrained degree of freedom parameters for body side hinges and door lock centers in a finite element model of a door comprises:
the degrees of freedom in three rotation directions and three translation directions are restricted for the vehicle body side hinge;
the degrees of freedom in two rotational directions and two translational directions are constrained to the door lock center.
5. The door pre-deformation analysis method of any one of claims 1-4, wherein the door finite element model corresponds to a plurality of sections of adhesive tape, and the step of applying a loading force to a loading node in the door finite element model in a loading direction comprises:
constructing a loading node set in a vehicle door finite element model corresponding to each section of rubber strip;
calculating the loading force of a loading node in the vehicle door finite element model corresponding to each section of rubber strip;
determining the loading direction of a loading node in the vehicle door finite element model corresponding to each section of rubber strip;
and automatically applying a loading force to the loading nodes in the door finite element model along the loading direction according to an automatic loading load program written based on the TCL scripting language, the loading node set in the door finite element model corresponding to each section of rubber strip, and the loading direction and the loading force of the loading nodes.
6. The door pre-deformation analysis method of claim 5, wherein the step of calculating the loading force of the loading node in the door finite element model corresponding to each section of the strip comprises:
according to a preset loading force calculation formula, the number of loading nodes in the vehicle door finite element model corresponding to each section of rubber strip, the length of each section of rubber strip and the load of unit length, calculating the loading force of the loading nodes in the vehicle door finite element model corresponding to each section of rubber strip, wherein the preset loading force calculation formula is as follows:
f is the loading power of loading node in the door finite element model that the adhesive tape corresponds, and K is the load of adhesive tape unit length, and L is adhesive tape length, and N is the loading node quantity in the door finite element model that the adhesive tape corresponds.
7. The door pre-deformation analysis method of claim 6, wherein the step of invoking a solver to perform a simulation calculation on the door finite element model to obtain the door pre-deformation analysis result is followed by:
judging whether the vehicle door three-dimensional model needs to be optimized or not according to the vehicle door predeformation analysis result;
and when the fact that the three-dimensional model of the vehicle door needs to be optimized is determined, optimizing the three-dimensional model of the vehicle door, and returning to the step of executing the step of constructing the finite element model of the vehicle door without the sealing strip according to the three-dimensional model of the vehicle door until the fact that the three-dimensional model of the vehicle door does not need to be optimized is determined.
8. A vehicle door pre-deformation analysis system, the system comprising:
the building module is used for building a finite element model of the vehicle door without a sealing strip according to the three-dimensional model of the vehicle door;
the first defining module is used for defining the material parameters of each part in the finite element model of the vehicle door;
the second definition module is used for defining constraint freedom degree parameters of a vehicle body side hinge and a door lock center in the vehicle door finite element model;
the applying module is used for applying loading force to a loading node in the vehicle door finite element model along a loading direction;
and the calculation module is used for setting a solving mode and solving parameters of the solver, and calling the solver to perform simulation calculation on the finite element model of the vehicle door so as to obtain a pre-deformation analysis result of the vehicle door.
9. A terminal, characterized in that the terminal comprises: a communication module, a memory, a processor and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the door pre-deformation analysis method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the door pre-deformation analysis method according to one of the claims 1 to 7.
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