CN113033061A - Concept-stage automobile body-in-white lightweight analysis method, system, medium and equipment - Google Patents
Concept-stage automobile body-in-white lightweight analysis method, system, medium and equipment Download PDFInfo
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Abstract
The invention discloses a concept phase automobile body-in-white lightweight analysis method, which comprises the following steps: grading the vehicles according to the vehicle wheelbases, and determining the grades corresponding to the developed vehicles; determining a target lightweight coefficient reference value which is at the same level as the developed vehicle from a competitive product lightweight coefficient database, wherein the competitive product lightweight coefficient database is used for storing the levels of the competitive product vehicles and the lightweight coefficient reference value corresponding to each level; calculating a lightweight coefficient of the developed vehicle; and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle. The method enables the white car body lightweight design in the concept stage to achieve a reasonable target, and reduces the possibility of later structural change.
Description
Technical Field
The invention belongs to the field of automobile research and development, and particularly relates to a method and a system for carrying out lightweight analysis on an automobile body-in-white in a concept stage, a computer storage medium and computer equipment.
Background
The weight of the automobile has a direct relationship with energy consumption, exhaust emission and collision safety regulations, and the weight of the automobile is required to be continuously reduced based on various considerations, so that the automobile weight reduction technology becomes a research hotspot in the industry.
At the present stage, the design flow of the white automobile body structure of the automobile is designed firstly and then simulated, the places with unreasonable design on the structure can only be found in the later simulation, and then the structural design is modified and then the simulation is carried out. If the body-in-white is light after the concept stage, the structure is modified for light weight, and simulation needs to be carried out again, so that the whole development time is prolonged.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a method for carrying out lightweight analysis on an automobile body-in-white at a concept stage, so that the lightweight design of the automobile body-in-white at the concept stage can achieve a reasonable aim.
The technical scheme is as follows: the invention discloses a concept phase automobile body-in-white lightweight analysis method on one hand, which comprises the following steps:
grading the vehicles according to the vehicle wheelbases, and determining the grades corresponding to the developed vehicles;
determining a target lightweight coefficient reference value which is at the same level as the developed vehicle from a competitive product lightweight coefficient database, wherein the competitive product lightweight coefficient database is used for storing the levels of the competitive product vehicles and the lightweight coefficient reference value corresponding to each level;
calculating a lightweight coefficient of the developed vehicle; and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle.
Specifically, the weight reduction coefficient reference value is calculated according to the weight reduction coefficient of the competitive vehicle in each grade, and the weight reduction coefficient reference value is a statistical average value or a median of the weight reduction coefficient.
The lightweight coefficient calculation step of the developed vehicle comprises the following steps:
calculating the torsional stiffness value C of the developed vehicleTIn units of N.m/°;
calculating a lightweight coefficient L: l ═ m/(C)T·A)；
Wherein m is the body-in-white weight in kg; a is the footprint area of the car body and is in m2。
Further, the concept phase automobile body-in-white lightweight analysis method further comprises the following steps:
calculating the lightweight coefficient again for the research and development vehicle after lightweight;
and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle until the weight reduction coefficient is smaller than the target weight reduction coefficient reference value.
The step of performing lightweight processing on the current body model of the developed vehicle includes:
establishing a grid model: setting grid size parameters and material elastic modulus to generate a hexahedral grid model of the current vehicle body;
design variables are defined: defining hexahedron units in the hexahedron grid model as design variables, and setting minimum passenger size control parameters and symmetric constraints;
defining a response, the response comprising: volume fraction, left front absorber tower Z-direction position, right front absorber tower Z-direction position, torsional stiffness response;
the torsional stiffness response is:
wherein x1、x2Z-direction displacement quantities of the left and right shock absorber towers are respectively, D is the distance between the left and right front shock absorber towers, and abs () is an absolute operator;
defining a constraint condition: torsional stiffness of body in white
A preset body-in-white torsional stiffness threshold value is obtained;
defining an optimization objective: setting the minimum volume fraction as an optimization target;
setting an optimized maximum iteration number, and outputting a finite element grid model; and analyzing the finite element mesh model by adopting post-processing software to obtain a lightweight result.
Further, the concept phase automobile body-in-white lightweight analysis method further comprises the following steps:
after a new competitive vehicle comes out, determining the grade of the new competitive vehicle according to the vehicle wheelbase of the new competitive vehicle;
and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs.
On the other hand, the invention also discloses a concept phase automobile body-in-white lightweight analysis system, which comprises the following components:
the vehicle grading module is used for grading the vehicle according to the vehicle wheel base and determining the grade corresponding to the developed vehicle;
the competitive product lightweight coefficient database is used for storing grades of competitive product vehicles and lightweight coefficient reference values corresponding to the grades;
the system comprises a target lightweight coefficient reference value determining module, a database and a database, wherein the target lightweight coefficient reference value determining module is used for determining a target lightweight coefficient reference value which is at the same level as a developed vehicle from a competitive product lightweight coefficient database;
the weight reduction coefficient calculation and judgment module of the developed vehicle is used for calculating the weight reduction coefficient of the developed vehicle and comparing the weight reduction coefficient with the target weight reduction coefficient reference value;
and developing a vehicle lightweight module for carrying out lightweight processing on the current vehicle body model of the developed vehicle.
Further, the concept phase car body-in-white lightweight analysis system further comprises:
the competitive product lightweight coefficient reference value updating module is used for determining the grade of a new competitive product vehicle according to the vehicle wheel base of the new competitive product vehicle after the new competitive product vehicle comes into the market; and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs.
The invention also discloses a computer storage medium, wherein a computer program is stored on the computer storage medium, and the computer program is executed by a processor to realize the concept phase automobile body-in-white lightweight analysis method.
The invention also discloses computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the automobile body-in-white lightweight analysis method in the concept stage when executing the computer program.
Has the advantages that: the invention discloses a concept-stage automobile body-in-white lightweight analysis method, which enables the concept-stage automobile body-in-white lightweight design to achieve a reasonable target, reduces the possibility of later-stage structure change, reduces the difficulty and cost of later-stage automobile body lightweight, and shortens the research and development period.
Drawings
FIG. 1 is a flow chart of a conceptual phase automotive body-in-white lightweight analysis method disclosed in the present invention;
FIG. 2 is a diagram illustrating the effect of the first embodiment after the vehicle is lightened;
FIG. 3 is a schematic diagram of the concept phase automotive body-in-white lightweight analysis system of the present disclosure.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
The first embodiment is as follows:
the invention discloses a concept phase automobile body-in-white lightweight analysis method, as shown in figure 1, comprising the following steps:
s1, grading the vehicle according to the vehicle wheel base, and determining the grade corresponding to the developed vehicle;
generally, the vehicle is classified into four classes ABCD according to the wheel base of the vehicle, and the classification is performed in the present embodiment by using the method shown in table 1.
TABLE 1 vehicle wheelbase and grade
| Range of wheelbase | [2600,2800) | [2800,2900) | [2900,3000) | Greater than or equal to 3000 |
| Grade | A | B | C | D |
S2, determining a target weight reduction coefficient reference value in the same grade as the developed vehicle from a competitive product weight reduction coefficient database, wherein the competitive product weight reduction coefficient database is used for storing grades of competitive product vehicles and weight reduction coefficient reference values corresponding to each grade;
the competitive products in the embodiment comprise self-grinding products and products produced by other manufacturers. The lightweight coefficient of the competitive products can be obtained by collecting public information or inquiry statistical information of the competitive products. In order to reduce the error, the present embodiment obtains the weight reduction coefficient of the competitive products in a manner consistent with the calculation method of the weight reduction coefficient of the currently developed vehicle, and the specific steps are as shown in S4.
In order to reduce the influence of extreme conditions, the reference value of the weight reduction coefficient in the invention is the statistical average value or the median of the weight reduction coefficient of the competitive products vehicles in each grade, namely the reference value of the weight reduction coefficient of each grade is the statistical average value or the median of the weight reduction coefficient of the competitive products vehicles in the database of the weight reduction coefficient of the competitive products.
S3, calculating a lightweight coefficient of the developed vehicle; and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle.
In the present invention, the calculating step of the vehicle weight reduction coefficient includes:
a1, calculating the torsional rigidity value C of the developed vehicleTIn units of N.m/°;
establishing an analysis model according to the working condition of torsional rigidity of a white automobile body, adding a windshield and an auxiliary frame, constraining XYZ axial movement of a left rear shock absorber tower, constraining YZ axial movement of a right rear shock absorber tower, constraining Z axial movement of a position between front anti-collision beams, and loading Z-direction positive and negative forces on the left front shock absorber tower and the right front shock absorber tower respectively, wherein the magnitude of the Z-direction positive and negative forces is 1000N in the embodiment, namely the force of loading Z-direction positive 1000N on the left front shock absorber tower and the force of loading Z-direction negative 1000N on the right front shock absorber tower; and solving and calculating, and outputting the displacement of the loading point, thereby calculating to obtain the torsional rigidity value.
There are a variety of software available for calculating torsional stiffness values, such as: hypermesh modeling, Optistruct calculation and Hyperview result processing, and Nastran can also calculate the torsional rigidity value.
A2, calculating a lightweight coefficient L: l ═ m/(C)T·A)；
Wherein m is the body-in-white weight in kg; a is the footprint area of the car body and is in m2。
In this embodiment, a topology optimization method is adopted to perform lightweight processing on a current body model of a developed vehicle, and the method includes the following steps:
b1, establishing a grid model:
generating a hexahedral mesh unit of the current vehicle body by using a shrink wrap mesh panel, setting the mesh size to be 20mm, setting the elastic modulus of the material to be 6000Mpa, selecting a Psolid card for the attribute, and setting the hexahedral mesh unit as an established mesh model;
b2, defining design variables: defining hexahedron units in the hexahedron grid model as design variables, and setting minimum passenger size control parameters and symmetric constraints; the minimum occupant size control parameter in this embodiment is 40 mm;
b3, defining a response, wherein the response comprises: the volume fraction of the designed structure (i.e. body in white), the Z-direction position of the left front absorber tower, the Z-direction position of the right front absorber tower and the torsional rigidity response;
the torsional stiffness response is:
wherein x1、x2Z-direction displacement quantities of the left and right shock absorber towers are respectively, D is the distance between the left and right front shock absorber towers, and abs () is an absolute operator;
b4, defining constraint conditions: torsional stiffness of body in white
A preset body-in-white torsional stiffness threshold value is obtained; in this example
The value is 20000;
b5, defining an optimization target: setting the minimum volume fraction as an optimization target;
b6, setting the optimized maximum iteration times, and outputting a finite element mesh model; and analyzing the finite element mesh model by adopting post-processing software to obtain a lightweight result.
In this embodiment, the maximum iteration number is set to 20, a finite element mesh model in a format of fem is submitted to optistruct calculation, after 20 steps of iteration, a result file in a des.h3d format is output, and a post-processing software Hyperview is used for opening analysis, wherein the result is shown in fig. 2, fig. 2- (a) is a front floor material distribution schematic diagram, and fig. 2- (b) is a rear floor material distribution schematic diagram; fig. 2- (c) is a schematic diagram of the material distribution of the back panel, wherein the position of the hollow is a position where the material can be subtracted.
And S4, calculating the weight reduction coefficient again for the developed vehicle after weight reduction, and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction processing on the current vehicle body model of the developed vehicle until the weight reduction coefficient is smaller than the target weight reduction coefficient reference value.
Therefore, the light weight coefficient of the body-in-white is controlled to be at the middle and upper level of the light weight coefficient of the competitive vehicle in the concept design stage, and the possibility of changing the structure in the later stage is reduced, so that the research and development period is shortened, and the efficiency is improved.
With the improvement of the technology, the body-in-white weight reduction coefficient of the competitive vehicle is also continuously reduced, namely, the weight reduction level is higher and higher due to the improvement of the technology such as materials, structures and the like. In order to maintain a competitive level of weight reduction, the weight reduction coefficient reference value of the racing vehicle in each grade needs to be continuously updated.
Tracking newly listed competitive vehicle, and determining the grade of the newly listed competitive vehicle according to the vehicle wheel base of the newly listed competitive vehicle after the newly listed competitive vehicle comes out; and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs. In order to reflect the current light weight level more accurately, vehicles in the competitive product light weight coefficient database which are appeared to be earlier in the market are deleted, and the vehicles in the competitive product light weight coefficient database are maintained in the latest time range.
Example two:
the invention also discloses a system for realizing the white automobile body lightweight analysis method in the concept stage in the first embodiment, as shown in fig. 3, the system comprises:
the vehicle grading module 1 is used for grading the vehicle according to the vehicle wheel base and determining the grade corresponding to the developed vehicle;
a bidding product lightweight coefficient database 2, which is used for storing the grades of bidding product vehicles and lightweight coefficient reference values corresponding to each grade;
the target weight reduction coefficient reference value determining module 3 is used for determining a target weight reduction coefficient reference value which is in the same grade with the developed vehicle from the competitive product weight reduction coefficient database;
the weight reduction coefficient calculation and judgment module 4 of the developed vehicle is used for calculating the weight reduction coefficient of the developed vehicle and comparing the weight reduction coefficient with the target weight reduction coefficient reference value;
and developing a vehicle lightweight module 5 for carrying out lightweight processing on the current body model of the developed vehicle.
The competitive product lightweight coefficient reference value updating module 6 is used for determining the grade of a new competitive product vehicle according to the vehicle wheel base of the new competitive product vehicle after the new competitive product vehicle comes out; and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs.
The invention also discloses a computer storage medium, on which a computer program is stored, which when executed by a processor implements the concept phase automobile body-in-white lightweight analysis method disclosed in the first embodiment.
The invention also discloses computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the concept-phase automobile body-in-white lightweight analysis method disclosed in the first embodiment.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A concept phase automobile body-in-white lightweight analysis method is characterized by comprising the following steps:
grading the vehicles according to the vehicle wheelbases, and determining the grades corresponding to the developed vehicles;
determining a target lightweight coefficient reference value which is at the same level as the developed vehicle from a competitive product lightweight coefficient database, wherein the competitive product lightweight coefficient database is used for storing the levels of the competitive product vehicles and the lightweight coefficient reference value corresponding to each level;
calculating a lightweight coefficient of the developed vehicle;
and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle.
2. The conceptual phase automotive body-in-white lightweighting analysis method of claim 1, wherein the lightweighting coefficient reference value is calculated from lightweighting coefficients of competing vehicles in each class, and the lightweighting coefficient reference value is a statistical average or median of the lightweighting coefficients.
3. The concept-staged automotive body-in-white lightweighting analysis method according to claim 1, wherein the step of calculating the lightweighting coefficient of the developed vehicle comprises:
calculating the torsional stiffness value C of the developed vehicleTIn units of N.m/°;
calculating a lightweight coefficient L: l ═ m/(C)T·A)；
Wherein m is the body-in-white weight in kg; a is the footprint area of the car body and is in m2。
4. The concept-staged automotive body-in-white lightweighting analysis method according to claim 1, further comprising:
calculating the lightweight coefficient again for the research and development vehicle after lightweight;
and if the weight reduction coefficient is larger than the target weight reduction coefficient reference value, carrying out weight reduction treatment on the current body model of the developed vehicle until the weight reduction coefficient is smaller than the target weight reduction coefficient reference value.
5. The concept-phase automotive body-in-white lightweighting analysis method of claim 1, wherein the step of lightweighting the current body model of the developed vehicle comprises:
establishing a grid model: setting grid size parameters and material elastic modulus to generate a hexahedral grid model of the current vehicle body;
design variables are defined: defining hexahedron units in the hexahedron grid model as design variables, and setting minimum passenger size control parameters and symmetric constraints;
defining a response, the response comprising: volume fraction, left front absorber tower Z-direction position, right front absorber tower Z-direction position, torsional stiffness response;
the torsional stiffness response is:
wherein x1、x2Z-direction displacement quantities of the left front shock absorber tower and the right front shock absorber tower are respectively shown, D is the distance between the left front shock absorber tower and the right front shock absorber tower, and abs () is an absolute operator;
defining a constraint condition:
a preset body-in-white torsional stiffness threshold value is obtained;
defining an optimization objective: setting the minimum volume fraction as an optimization target;
setting an optimized maximum iteration number, and outputting a finite element grid model; and analyzing the finite element mesh model by adopting post-processing software to obtain a lightweight result.
6. The concept-staged automotive body-in-white lightweighting analysis method according to claim 1, further comprising:
after a new competitive vehicle comes out, determining the grade of the new competitive vehicle according to the vehicle wheelbase of the new competitive vehicle;
and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs.
7. A concept phase automotive body-in-white lightweight analysis system, comprising:
the vehicle grading module is used for grading the vehicle according to the vehicle wheel base and determining the grade corresponding to the developed vehicle;
the competitive product lightweight coefficient database is used for storing grades of competitive product vehicles and lightweight coefficient reference values corresponding to the grades;
the system comprises a target lightweight coefficient reference value determining module, a database and a database, wherein the target lightweight coefficient reference value determining module is used for determining a target lightweight coefficient reference value which is at the same level as a developed vehicle from a competitive product lightweight coefficient database;
the weight reduction coefficient calculation and judgment module of the developed vehicle is used for calculating the weight reduction coefficient of the developed vehicle and comparing the weight reduction coefficient with the target weight reduction coefficient reference value;
and developing a vehicle lightweight module for carrying out lightweight processing on the current vehicle body model of the developed vehicle.
8. The concept phase automotive body-in-white lightweight analysis system of claim 7, further comprising:
the competitive product lightweight coefficient reference value updating module is used for determining the grade of a new competitive product vehicle according to the vehicle wheel base of the new competitive product vehicle after the new competitive product vehicle comes into the market; and updating the weight reduction coefficient reference value corresponding to the grade to which the new competitive products vehicle belongs according to the weight reduction coefficient of the new competitive products vehicle and the weight reduction coefficients of all historical vehicles in the grade to which the new competitive products vehicle belongs.
9. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the concept-staged automotive body-in-white lightweighting analysis method of any one of claims 1-6.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the concept phase automotive body-in-white lightweighting analysis method of any one of claims 1-6.
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