CN116894295A - Finite element modeling method for arbitrary opening posture of front cover of automobile four-bar hinge - Google Patents

Finite element modeling method for arbitrary opening posture of front cover of automobile four-bar hinge Download PDF

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Publication number
CN116894295A
CN116894295A CN202310776307.XA CN202310776307A CN116894295A CN 116894295 A CN116894295 A CN 116894295A CN 202310776307 A CN202310776307 A CN 202310776307A CN 116894295 A CN116894295 A CN 116894295A
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front cover
model
finite element
automobile
bar hinge
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李�赫
肖永富
马明辉
李景潭
王月
杨涛
刘启龙
王宁
孙立伟
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FAW Group Corp
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FAW Group Corp
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • General Engineering & Computer Science (AREA)
  • Evolutionary Computation (AREA)
  • Aviation & Aerospace Engineering (AREA)
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  • Automation & Control Theory (AREA)
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Abstract

The invention relates to a finite element modeling method for any opening posture of a front cover of an automobile four-bar hinge, which comprises the steps of inputting a grid model inp file of a closing state of an automobile front cover system assembly; creating a modal analysis load step to check the correctness of the physical state and the connection assembly state of the model; constructing a static analysis load step, and controlling the target attitude by driving the longitudinal displacement of the latch hook by displacement; extracting object posture increment step model information of odb results; writing out the target attitude model information of the automobile front cover; replacing the coordinate information in the new attitude model information with the coordinate information of the original finite element model, and further obtaining a finite element model of the opening attitude of the front cover target of the automobile four-bar hinge; extracting codes to generate scripts to realize automatic actions. The method uses an ABAQUS solver to calculate the position and the gesture of the model at any angle and the connection gesture of each motion mechanism design part of the front cover assembly, and derives and restores the final state to the function of the analyzable finite element model.

Description

Finite element modeling method for arbitrary opening posture of front cover of automobile four-bar hinge
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a finite element rapid modeling method for an arbitrary opening posture of a front cover of a four-bar hinge of an automobile.
Background
The four-bar linkage hinge is widely applied to automobile front covers. In the development of automobiles, various finite element simulation analyses of front covers under different opening angle postures are necessarily carried out due to different performance verification projects and standards. Compared with a car door and a rear cover (a trunk cover, a back door and other rotating parts), the rotating assembly can be rotated around a rotating center by any angle posture through related functions in any pretreatment tool (HyperMesh, ansa and the like); because of the structural characteristics of the four-bar hinge of the front cover, the rotation center of the four-bar hinge is difficult to find, which is a difficult point for finite element modeling of different angle postures of the front cover.
One of the existing feasible methods is to divide a series of works such as grid and finite element modeling based on target state data by designing front cover data for outputting a target angle, so that the labor cost is high, the time-consuming period is long, and the flexibility is lacking;
the existing feasible method is to find a rotation center by utilizing a theoretical method of plane geometry, define the rotation center in a pretreatment tool, rotate a corresponding rotation member of a front cover to a target angle around the rotation center, and then treat the gesture of a four-bar response part, and the method is troublesome and time-consuming;
in order to meet the simulation requirements of various working conditions, a simple and feasible finite element rapid modeling method capable of realizing any opening posture of an automatic front cover is necessary.
Disclosure of Invention
The invention aims to provide a finite element rapid modeling method for an arbitrary opening posture of a front cover of an automobile four-bar hinge, which aims to solve the problem of automatic finite element rapid modeling for the arbitrary opening posture of the front cover.
The invention aims at realizing the following technical scheme:
a finite element modeling method for any opening posture of a front cover of an automobile four-bar hinge comprises the following steps:
A. inputting a grid model inp file of the closing state of the automobile front cover system assembly;
B. creating a modal analysis load step to check the correctness of the physical state and the connection assembly state of the model;
C. constructing a static analysis load step, and controlling the target attitude by driving the longitudinal displacement of the latch hook by displacement;
D. extracting object posture increment step model information of odb results;
E. writing out the target attitude model information of the automobile front cover;
F. replacing the coordinate information in the new attitude model information with the coordinate information of the original finite element model, and further obtaining a finite element model of the opening attitude of the front cover target of the automobile four-bar hinge;
G. extracting codes of the step D to the step F to generate scripts so as to realize automatic actions.
Further, in the step A, the grid model comprises a front cover assembly grid model, a four-bar hinge assembly grid model, a support bar grid model, a lock hook assembly grid model and relevant parts required by corresponding finite element simulation analysis.
Furthermore, finite element modeling 1 is performed on the grid, and corresponding attribute, material, motion mechanism unit, characteristic parameter and rigid coupling connection model key information are given to the model.
Further, the step B specifically comprises the following steps:
b1, defining a modal analysis keyword, a frequency and related parameters, defining an output setting keyword and a field variable output keyword, and outputting a displacement variable;
b2, submitting operation after finishing the setting, checking the modal analysis result, checking that the physical state and the connection assembly state of the model are correct, and accurately operating and analyzing;
and B3, deleting the load step information after the model is debugged, obtaining a front cover system finite element model of the front cover system assembly closing gesture, and storing inp format files.
Further, in the step C, a Z-direction height H of the locking hook relative to the closing state under the target attitude of the front cover of the automobile is used as a parameter for opening the attitude of the front cover, and a static analysis load step is constructed based on the finite element model of the closing attitude of the front cover system assembly of the automobile in the step A.
Further, step D is specifically: reading the odb model, and reading a part file of the last incremental step of the front cover system result odb file in a part mode, wherein the file only has node coordinates and unit definition information and has no other finite element information.
Further, the read-in result in the step D and the step E is the model state of the front cover system in the target opening posture, an input file is written, and the grid model information of the front cover system in the target opening posture is exported to the input file.
Further, in step F, replacing the coordinate text of all nodes subordinate to the node keyword in the input inp file in step a with the node coordinate text of all nodes in the derived inp format generated in step E, and storing the node coordinate text to obtain the front cover system target open posture grid model inp file.
Further, in step G, the script command stream of the actions of step D and step E is extracted and stored as a py format script, namely an ABAQUS/CAE process action plug-in py file, namely the automatic operation of the series of actions of the two steps is realized.
Further, steps a-G may all be performed for overall automated packaging.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a finite element rapid modeling method for an arbitrary opening posture of a front cover of an automobile four-bar hinge. The beneficial effects generated by the method are as follows:
1. the modeling processing flow is simplified, and the steps of manual participation are greatly reduced;
2. the error rate is reduced, the manual participation is reduced to the minimum, and errors and deviations caused by manual intervention on the gesture of the model related parts are avoided, so that the analysis result is wrong;
the invention is only carried out in ABAQUS software, and can realize automatic packaging due to the solidification and simplicity of the flow.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a step flow diagram of a finite element modeling method for an arbitrary opening posture of a front cover of a four-bar hinge of an automobile;
FIG. 2 is a finite element model of a front cover system of the closed position of the front cover system assembly of the automobile;
FIG. 3 is a schematic diagram of a finite element pretreatment software importation model;
fig. 4 front cover system target open state.
Detailed Description
The invention is further illustrated by the following examples:
the invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
The invention relates to a finite element modeling method for an arbitrary opening gesture of a front cover of an automobile four-bar hinge, which mainly aims at the front cover of the automobile four-bar hinge and similar structures without obvious rotation centers, and as shown in figure 1, and comprises the following steps:
1. inputting a grid model inp file of the closing state of the automobile front cover system assembly;
2. creating a modal analysis load step to check the correctness of the physical state and the connection assembly state of the model;
3. constructing a static analysis load step, and controlling the target attitude by driving the longitudinal displacement of the latch hook by displacement;
4. extracting object posture increment step model information of odb results;
5. writing out the target attitude model information of the automobile front cover;
6. replacing the coordinate information in the new attitude model information with the coordinate information of the original finite element model, and further obtaining a finite element model of the opening attitude of the front cover target of the automobile four-bar hinge;
7. extracting codes of the steps 4-6 to generate scripts so as to realize automatic actions.
Specifically, the method comprises the following steps:
firstly, inputting a grid model inp file of a closing state of an automobile front cover system assembly, as shown in fig. 1a, wherein the file comprises a front cover assembly grid model, a four-bar hinge assembly grid model, a stay bar grid model, a lock hook assembly grid model and relevant parts (such as a sealing strip, a limiting block and the like which are arranged on a part grid model of the front cover system) required by corresponding finite element simulation analysis. Finite element modeling 1 is performed on the grid, and model key information such as corresponding attributes (keyword definition), materials (keyword definition), motion mechanism units and characteristic parameters (keyword definition connector section and keyword definition connector behavior), rigid coupling connection and the like is given to the model.
Secondly, creating a modal analysis load step, defining a modal analysis keyword, a frequency and related parameters, defining an output setting keyword and a field variable output keyword, and outputting a displacement variable. And submitting operation after the setting is completed, checking the modal analysis result, checking that the physical state and the connection assembly state of the model are correct, and accurately operating and analyzing. After the model is debugged, deleting the load step information to obtain a front cover system finite element model of the closing gesture of the front cover system assembly of the automobile, and storing an inp format file as shown in fig. 1 b. As shown in fig. 2.
And thirdly, taking the Z-direction height H of the locking hook relative to the closed state under the front cover target attitude (the front cover target opening angle) of the automobile as a parameter of front cover attitude opening, as shown in fig. 1 c. The static analysis load step is constructed based on a closed-posture finite element model of the automobile front cover system assembly of the first step as shown in fig. 1 b.
First, constraint key of defining a load analysis step:
1. the center of a bracket hole, which is connected with the vehicle body, of the hinge is connected with the model through rigid coupling, and the center point constrains 1-6 degrees of freedom;
2. the latch hook engagement point and the latch hook structure are connected with the model through rigid coupling, and the coupling center point (engagement point) constrains the Z-direction upward degree of freedom, namely the 3-degree of freedom.
Next, the loading condition is constrained in keyword-driven load analysis step 2, so that the coupling point is forced to move upwards in the Z direction (i.e. the positive direction of 3 degrees of freedom) by the H height of the "second step" input, as shown in fig. 1 c.
After the definition is finished, storing a finite element model inp format file of the third step, and submitting the file to run to obtain a front cover system result odb file, wherein the result file covers all load step processes from a front cover system closing state to a target opening state as shown in fig. 1 d. The closed state of the front cover system is shown in fig. 3, and the target open state of the front cover system is shown in fig. 4.
Fourthly, reading an odb model by using ABAQUS/CAE software: (1) reading in a part file of the last incremental step of a front cover system result odb file (figure 1 d) in a part mode, wherein the file only has node coordinates and unit definition information and has no other finite element information;
fifthly, the field variable node unit information of the last increment step of the front cover system result odb file which is imported and generated in the fourth step is led out to be shown in the figure 1, and the steps 1-7 are that:
1. creating any material, section, instance (which may be empty);
2. a job is created (select the current model). And the read-in results in the fourth and fifth steps are the model state of the front cover system in the target opening posture, and input files are written out. The grid model information of the front cover system in the target opening gesture is exported to the input file.
And sixth, replacing coordinate texts of all nodes subordinate to the node keyword in the input inp file in the first step with the node coordinate texts in the fifth step to generate and store all the node coordinate texts in the derived inp format, and obtaining the front cover system target opening gesture grid model inp file, as shown in fig. 1 f.
And seventh, extracting script command streams of actions of the fourth step and the fifth step from ABAQUS/CAE software, and storing the script command streams as a py format script, namely an ABAQUS/CAE process action plug-in py file (shown in figure 1 g), namely realizing automatic operation of series actions of the two steps. Wherein, when the method is operated for the first time, the third step to the fifth step need manual operation; after the seventh step is completed, creating a bat file in the folder where py is located to start the py format file of fig. 1g (ABAQUS/CAE procedure actions of the third to fifth steps), and when the method is continued to be operated subsequently, the third to fifth steps only need to be completed automatically in the background.
In addition, the first step to the seventh step can be integrally and automatically packaged, so that labor cost is reduced.
Example 1
A finite element modeling method for any opening posture of a front cover of an automobile four-bar hinge comprises the following steps:
1. grid division and finite element modeling are carried out on the data in the ideal closing state, and the data are shown in figure 1;
2. performing constraint modal analysis to check model connectivity, wherein the model gesture is shown in fig. 2, defining a static opening working condition analysis step, setting a displacement parameter of a lock hook point 3 to 300mm, and storing the full name of a file as hood;
3. placing in the same folder of the hood.py and hood.bat files;
4. double-clicking a hood.bat file to generate a hood_modification.inp in a folder, wherein the hood_modification.inp is a grid information file with a front cover of 300 mm;
5. opening the hood_modification.inp file by using a document editor, copying all data under the node key words, replacing and pasting corresponding information in the hood.inp file, and additionally storing the hood_modification_final inp
6. The hood_modification_final.inp is imported with finite element preprocessing software, and the model is schematically shown in fig. 3.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. The finite element modeling method for the arbitrary opening posture of the front cover of the automobile four-bar hinge is characterized by comprising the following steps of:
A. inputting a grid model inp file of the closing state of the automobile front cover system assembly;
B. creating a modal analysis load step to check the correctness of the physical state and the connection assembly state of the model;
C. constructing a static analysis load step, and controlling the target attitude by driving the longitudinal displacement of the latch hook by displacement;
D. extracting object posture increment step model information of odb results;
E. writing out the target attitude model information of the automobile front cover;
F. replacing the coordinate information in the new attitude model information with the coordinate information of the original finite element model, and further obtaining a finite element model of the opening attitude of the front cover target of the automobile four-bar hinge;
G. extracting codes of the step D to the step F to generate scripts so as to realize automatic actions.
2. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and step A, the grid model comprises a front cover assembly grid model, a four-bar hinge assembly grid model, a stay bar grid model, a lock hook assembly grid model and relevant parts required by corresponding finite element simulation analysis.
3. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 2, which is characterized in that: finite element modeling 1 is carried out on the grids, and the corresponding attribute, material, motion mechanism unit, characteristic parameter and rigid coupling connection model key information are endowed to the model.
4. The finite element modeling method for any opening posture of a front cover of an automobile four-bar hinge according to claim 1, wherein the step B specifically comprises the following steps:
b1, defining a modal analysis keyword, a frequency and related parameters, defining an output setting keyword and a field variable output keyword, and outputting a displacement variable;
b2, submitting operation after finishing the setting, checking the modal analysis result, checking that the physical state and the connection assembly state of the model are correct, and accurately operating and analyzing;
and B3, deleting the load step information after the model is debugged, obtaining a front cover system finite element model of the front cover system assembly closing gesture, and storing inp format files.
5. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and C, taking the Z-direction height H of the locking hook relative to the closing state under the target attitude of the front cover of the automobile as a parameter for opening the attitude of the front cover, and constructing a static analysis load step based on the finite element model of the closing attitude of the front cover system assembly of the automobile in the step A.
6. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, wherein the step D is specifically as follows: reading the odb model, and reading a part file of the last incremental step of the front cover system result odb file in a part mode, wherein the file only has node coordinates and unit definition information and has no other finite element information.
7. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and D, reading a result in the step E, namely writing an input file for the model state of the front cover system in the target opening posture, namely exporting grid model information of the front cover system in the target opening posture into the input file.
8. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and F, replacing the coordinate texts of all nodes subordinate to the node keywords in the input inp file in the step A with the node coordinate texts in the derived inp format generated in the step E, and storing the node coordinate texts to obtain the front cover system target opening gesture grid model inp file.
9. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and G, extracting script command streams of actions of the step D and the step E, and storing the script command streams as a py format script, namely an ABAQUS/CAE process action plug-in py file, namely realizing automatic operation of series actions of the two steps.
10. The finite element modeling method for any opening posture of the front cover of the automobile four-bar hinge according to claim 1, which is characterized in that: and all the steps A to G can be integrally and automatically packaged.
CN202310776307.XA 2023-06-28 2023-06-28 Finite element modeling method for arbitrary opening posture of front cover of automobile four-bar hinge Pending CN116894295A (en)

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