CN112560164A - Automobile B-pillar section design method and computer readable storage medium - Google Patents
Automobile B-pillar section design method and computer readable storage medium Download PDFInfo
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Abstract
The invention relates to a method for designing a section of an automobile B column and a computer readable storage medium, comprising the following steps: step S1, acquiring section inertia moment Ia and all-plastic section bending moment Ma of each section of the middle upper part of the target basic vehicle type B column; step S2, establishing a target base vehicle type B column section finite element model according to the section moment of inertia Ia and the all-plastic section bending moment Ma; step S3, carrying out finite element simulation analysis on the B-pillar section finite element model to obtain the maximum contact force Fa of the pressing plate and the target basic vehicle type under the jacking pressure working condition, and determining the roof compression strength A of the target basic vehicle type according to the maximum contact force Fa; and S4, determining each section attribute parameter of the final B pillar according to the comparison result of the roof compression strength A of the target basic vehicle type and a first preset threshold T1. The method can avoid a large amount of repeated work in the later period caused by blind design of the B column section, and can avoid the visual field influence caused by unreasonable design of the B column section.
Description
Technical Field
The invention relates to the technical field of automobile B-pillar section design, in particular to an automobile B-pillar section design method and a computer readable storage medium.
Background
At present, the section of a B column designed in China mainly considers the 50km/h MDB working condition in CNCAP and the rigidity requirement of a body in white, and the jacking performance can meet the national standard requirement. In recent years, the car roof pressure resistance performance is considered in the CIASI, and higher requirements are put forward on the car body pressure resistance performance. Under the jacking working condition, the B column in the structural part of the vehicle body is a main bearing part, so the compression resistance of the vehicle roof is firstly considered in the design of the B column. The invention provides a method for designing a B-pillar section of an automobile based on a top pressure working condition based on the consideration.
When the B column of the current vehicle body structure is designed, the B column form is determined by considering factors such as modeling and man-machine according to the size of the section of the B column of a standard vehicle, the data is given to a simulation engineer for performance analysis after being finished, the performance is not up to standard and then optimized, the optimization scheme provided by the simulation engineer needs the data engineer to evaluate again, the data engineer evaluates the performance after making the data again by the simulation engineer, the process can be repeated for multiple rounds, and finally the section design of the B column meeting the performance requirement is obtained. The method only focuses on the material, thickness and section size of the B column, ignores comprehensive evaluation of essential attributes of the B column, and repeatedly tries, so that the efficiency is low, manpower and material resources are wasted, and the unreasonable design of the section of the B column possibly influences the visual field.
Disclosure of Invention
The invention aims to provide a method for designing a B column section of an automobile, so as to reduce the workload of B column design of a vehicle body structure and avoid the visual field influence caused by unreasonable B column section design.
In a first aspect, an embodiment of the present invention provides a method for designing a section of an automobile B-pillar, including the following steps:
step S1, acquiring section inertia moment and all-plastic section bending moment of each section of the middle upper part of the B column of the target basic vehicle type;
step S2, establishing a target base vehicle type B column section finite element model according to the section inertia moment and the all-plastic section bending moment;
step S3, carrying out finite element simulation analysis on the finite element model of the section of the B column to obtain the maximum contact force Fa of the pressing plate and the target basic vehicle type under the jacking pressure working condition, and determining the roof compression strength A of the target basic vehicle type according to the maximum contact force Fa;
s4, determining each section attribute parameter of the final B pillar according to the comparison result of the roof compression strength A of the target basic vehicle type and a first preset threshold T1; if A is larger than or equal to T1, outputting the section inertia moment Ia and the all-plastic section bending moment Ma corresponding to the roof compressive strength A as the attribute parameters of each section of the final B column; and if A < T1, adjusting the B column section property parameters of the section finite element model, and returning to the step S3.
Preferably, the adjusting of the B-pillar section property parameter in step S4 includes:
under the condition that the section of the B column of the target basic vehicle type is not changed, the B column is assumed not to generate plastic deformation, and finite element simulation analysis is carried out on a finite element model of the section of the B column to obtain the maximum contact force Fb of the pressing plate and the target basic vehicle type under the jacking working condition and the maximum bending moment Mb borne by each section;
determining the roof compressive strength B of the corresponding target basic vehicle type according to the maximum contact force Fb;
and adjusting the attribute parameters of each section of the B column according to the comparison result of the roof compressive strength B and the first preset threshold T1 and the maximum bending moment Mb borne by each section.
Preferably, the adjusting of the attribute parameters of each section of the B-pillar according to the comparison result of the roof compressive strength B and the first preset threshold T1 and the maximum bending moment Mb borne by each section comprises:
if B is larger than or equal to T1, maximizing the material strength of the B column under the engineering permission, calculating the all-plastic section bending moment Mc of each section of the corresponding B column, and then adjusting the attribute parameters of each section of the B column according to the comparison result of the maximum bending moment Mb borne by each section and the all-plastic section bending moment Mc of each section;
and if B is less than T1, improving the B-pillar section moment of inertia attribute parameter of the target vehicle type.
Preferably, the adjusting of the property parameters of each section of the B-pillar according to the comparison result between the maximum bending moment Mb borne by each section and the overall plastic section bending moment Mc of each section includes:
if the maximum bending moment Mb borne by each section is larger than the all-plastic section bending moment Mc of the corresponding section, the all-plastic section bending moment of the B column is improved;
if the maximum bending moment Mb borne by each section is less than or equal to the all-plastic section bending moment Mc of the corresponding section, calculating the roof compressive strength C of the target basic vehicle model under the top pressure working condition corresponding to the maximum B-pillar material strength, and further adjusting the B-pillar section inertia moment and the all-plastic section bending moment according to the comparison result of the roof compressive strength C and a first preset threshold T1.
Preferably, the further adjusting the B-pillar section moment of inertia and the all-plastic section bending moment according to the comparison result of the roof compression strength C with the first preset threshold T1 comprises:
if the difference value between C and T1 is less than or equal to a second preset threshold value T2, the all-plastic section bending moment attribute parameters of each section of the B column are not adjusted;
and if the difference value between the C and the T1 is larger than a second preset threshold value T2, the section inertia moment of the B column and the all-plastic section bending moment are improved.
Preferably, the roof compressive strength of the target base vehicle type is determined according to the maximum contact force by the following formula:
SWR＝F/m×9.81
wherein SWR is the roof compressive strength value of the target basic vehicle type, F is the maximum contact force, and m is the conditioning quality of the target basic vehicle type.
Preferably, the step S1 specifically includes acquiring the section moment of inertia of the four upper sections in the target basic vehicle type B-pillar and the all-plastic section bending moment.
Preferably, T1 is the ratio of the maximum load force to the vehicle weight that the vehicle body is subjected to before the platen is displaced 126.9 mm.
Preferably, T2 is equal to 0.5.
In a second aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method for designing a B-pillar section of an automobile.
The embodiment provides an automobile B-pillar section design method and a computer readable storage medium, which are characterized in that a B-pillar section inertia moment and a B-pillar all-plastic section bending moment are used as input from the beginning of automobile B-pillar section data design, a B-pillar section is purposefully designed in consideration of the jacking performance, B-pillar section attribute parameters are continuously and circularly adjusted, and finally a B-pillar section attribute meeting the jacking target requirement is obtained and used as an attribute requirement for finally constraining the B-pillar section design.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a section of a B-pillar of an automobile according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a vehicle body in a cross section along the entire vehicle X direction in the first embodiment of the present invention.
Fig. 3 is a cross-sectional view of a B-pillar of an automobile according to a first embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures closely related to the solution according to the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
As shown in fig. 1, a method for designing a section of a B-pillar of an automobile according to an embodiment of the present invention includes the following steps:
step S1, acquiring section inertia moment and all-plastic section bending moment of each section of the middle upper part of the B column of the target basic vehicle type;
step S2, establishing a target base vehicle type B column section finite element model according to the section inertia moment and the all-plastic section bending moment;
step S3, carrying out finite element simulation analysis on the finite element model of the section of the B column to obtain the maximum contact force Fa of the pressing plate and the target basic vehicle type under the jacking pressure working condition, and determining the roof compression strength A of the target basic vehicle type according to the maximum contact force Fa;
s4, determining each section attribute parameter of the final B pillar according to the comparison result of the roof compression strength A of the target basic vehicle type and a first preset threshold T1; if A is larger than or equal to T1, outputting the section inertia moment Ia and the all-plastic section bending moment Ma corresponding to the roof compressive strength A as the attribute parameters of each section of the final B column; and if A < T1, adjusting the B column section property parameters of the section finite element model, and returning to the step S3.
Specifically, T in this embodiment is a target value of roof compression strength of the target base vehicle type. In the process of designing the B column, the bending degree of the B column is increased as much as possible under the condition that other conditions allow. The bending degree of the B column has great influence on the jacking performance, and according to theoretical stress analysis, under the condition of consistent other conditions, the larger the bending degree of the section of the B column is, the better the jacking performance of the vehicle body is. Fig. 2 is a schematic diagram showing a vehicle body in a cross section along the entire vehicle X direction. Assuming that the contact force of the two types of vehicles is the same under the top pressure working condition, according to the theory that the trapezoid is more stable than the parallelogram, the displacement A type in the Y direction of the B column on the extrusion side is smaller than that of the B type, and the displacement A type in the direction of the pressing plate is smaller than that of the B type; in other words, the stress of the A-type vehicle is larger than that of the B-type vehicle under the same pressure plate displacement.
The cross-section moment of inertia is the integral of the product of the area of each infinitesimal element of the cross section and the quadratic product of the distance between each infinitesimal element and a neutralization axis parallel to or coincident with the X axis, and is a geometric parameter for measuring the bending resistance of the cross section. An all-plastic section bending moment refers to the bending moment that all materials of the section experience when they reach yield strength. The overall plastic section bending moment is an index for measuring the maximum bending moment that a section can bear under the condition of considering the yield strength of a material. Specifically, the section inertia moment Ia and the all-plastic section bending moment Ma of each section of the middle upper part of the B column can be obtained by obtaining a digital analog of a standard vehicle and analyzing by software such as CATIA (computer aided three-dimensional interactive application), PRIMER (prior art) and the like to obtain the section inertia moment and the all-plastic section bending moment.
When A is larger than or equal to T1, the section attribute of the current B column meets the requirement of the top pressure target, and the section moment of inertia Ia and the all-plastic section bending moment Ma at the moment can be output as the attribute requirements of each section of the final B column. And when A is less than T1, adjusting the B-pillar section attribute parameters of the section finite element model, returning to the step S3 to continue calculating the roof compressive strength A of the target basic vehicle type, and repeating the steps until A is more than or equal to T1, and finally obtaining a B-pillar section attribute meeting the top pressure target requirement as the attribute requirement for finally constraining the B-pillar section design.
According to the method for designing the B-pillar section of the automobile, according to the target requirement of the compression resistance of the roof, a performance engineer firstly obtains the B-pillar section attribute of a standard vehicle to be used as the B-pillar section attribute of an original target automobile type, then the B-pillar section attribute meeting the requirement is provided by the performance engineer through a finite element simulation analysis method, and the B-pillar section attribute is fed back to a data engineer to be used as the basic requirement of B-pillar design.
Referring to fig. 3 for each section of the B-pillar, four sections are selected from fig. 3, the first section moment of inertia is Ia1, the second section moment of inertia is Ia2, the third section moment of inertia is Ia3, and the fourth section moment of inertia is Ia 4; the first all-plastic section bending moment is Ma1, the second all-plastic section bending moment is Ma2, the third all-plastic section bending moment is Ma3, and the fourth all-plastic section bending moment is Ma 4.
Taking fig. 3 as an example, the adjusting of the B-pillar section property parameter in step S4 includes:
s41, under the condition that the section of the B column of the target basic vehicle type is not changed, assuming that the B column does not generate plastic deformation (namely the material of the B column is an elastic material), carrying out finite element simulation analysis on a finite element model of the section of the B column to obtain the maximum contact force Fb between a pressing plate and the target basic vehicle type under the pressing working condition and the maximum bending moment Mb1, Mb2, Mb3 and Mb4 borne by each section;
step S42, determining the roof compressive strength B of the corresponding target basic vehicle type according to the maximum contact force Fb;
and S43, adjusting the attribute parameters of each section of the B column according to the comparison result of the roof compressive strength B and a first preset threshold T1 and the maximum bending moment Mb borne by each section.
The section moment of inertia is the shape attribute of the section and is irrelevant to materials, and the section moment of inertia of the B column represents the bending resistance attribute of the B column, namely the larger the section moment of inertia of the B column is, the better the bending resistance of the B column is; the all-plastic section bending moment represents the shape and the material property of the section, and the all-plastic section bending moment of the B column represents the maximum bending moment borne by the B column when the B column is deformed in an all-plastic manner.
In one embodiment, the adjusting the section property parameters of the B-pillar according to the comparison result of the roof compression strength B and the first preset threshold T1 and the maximum bending moment Mb applied to each section includes:
if B is larger than or equal to T1, maximizing the strength of the B column material under engineering permission (for example, the B column material is made of a hot-formed steel plate), calculating all-plastic section bending moments Mc1, Mc2, Mc3 and Mc4 of all sections of the corresponding B column, and then adjusting all section attribute parameters of the B column according to the comparison result of the maximum bending moment Mb borne by each section and all-plastic section bending moments Mc of all sections;
and if B is less than T1, improving the B-pillar section moment of inertia attribute parameters of the target vehicle type, including but not limited to increasing the B-pillar section, increasing the B-pillar thickness and adding pieces.
In one embodiment, the adjusting of the section property parameters of the B-pillar according to the comparison result between the maximum bending moment Mb applied to each section and the overall plastic section bending moment Mc of each section includes:
if the maximum bending moment Mb borne by each section is larger than the all-plastic section bending moment Mc of the corresponding section, namely Mc1 is less than Mb1, Mc2 is less than Mb1, Mc3 is less than Mb3, Mc4 is less than Mb4, the all-plastic section bending moment of the B column needs to be improved, and the section, the added parts and the like of the B column are increased by a common method;
if the maximum bending moment Mb borne by each section is less than or equal to the all-plastic section bending moment Mc of the corresponding section, namely Mc1 is more than or equal to Mb1, Mc2 is more than or equal to Mb2, Mc3 is more than or equal to Mb3, and Mc4 is more than or equal to Mb4, calculating the roof compressive strength C of the target basic vehicle model under the top pressure working condition corresponding to the maximum B-pillar material strength, and further adjusting the attribute parameters of each section of the B-pillar according to the comparison result of the roof compressive strength C and a first preset threshold T1.
In one embodiment, the further adjusting the B-pillar section moment of inertia and the all-plastic section bending moment according to the comparison result of the roof compression strength C and the first preset threshold value T1 comprises:
if the difference value between C and T1 is less than or equal to a second preset threshold value T2, namely the difference between C and T1 is small, the all-plastic section bending moment attribute parameters of each section of the B column are not adjusted; the jacking performance can be improved by reinforcing the skylight beam, the A column and the C column, and the jacking performance comprises but is not limited to a smooth lap joint mode among all the parts, so that the parts are in smooth transition, the sections of all the parts are increased, the material grades of all the parts are improved, and the like;
if the difference between C and T1 is greater than a second predetermined threshold T2, i.e., the difference between C and T1 is greater, the section moment of inertia and the all-plastic section bending moment of the B-pillar are increased, including but not limited to increasing the section of the B-pillar, adding parts, increasing the grade of materials, etc.
In one embodiment, the roof compressive strength of the target base vehicle type is determined according to the maximum contact force by the following formula:
SWR＝F/m×9.81
wherein SWR is the roof compressive strength value of the target basic vehicle type, F is the maximum contact force, and m is the conditioning quality of the target basic vehicle type.
In an embodiment, the step S1 specifically includes obtaining the second moment of area and the all-plastic bending moment of area of the upper four sections of the target base vehicle type B pillar.
In one embodiment, T1 is the ratio of the maximum load force to the vehicle weight experienced by the vehicle body before the platen displacement is 126.9 mm.
In one embodiment, T2 is equal to 0.5.
According to the method for designing the section of the B column of the automobile, the inertia moment of the section of the B column and the all-plastic section bending moment of the B column are used as input from the beginning of the data design of the section of the B column of the automobile, the section of the B column is purposefully designed by considering the jacking performance, the attribute parameters of the section of the B column are continuously adjusted in a circulating mode, and finally the section attribute of the B column meeting the jacking target requirement is obtained and used as the attribute requirement for finally constraining the section design of the B column.
The second embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method for designing a section of a B-pillar of an automobile according to the first embodiment.
It is to be noted that, based on the content, those skilled in the art can clearly understand that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to implement the methods according to the embodiments of the present invention.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A method for designing a section of an automobile B column is characterized by comprising the following steps:
step S1, acquiring section inertia moment and all-plastic section bending moment of each section of the middle upper part of the B column of the target basic vehicle type;
step S2, establishing a target base vehicle type B column section finite element model according to the section inertia moment and the all-plastic section bending moment;
step S3, carrying out finite element simulation analysis on the finite element model of the section of the B column to obtain the maximum contact force Fa of the pressing plate and the target basic vehicle type under the jacking pressure working condition, and determining the roof compression strength A of the target basic vehicle type according to the maximum contact force Fa;
s4, determining each section attribute parameter of the final B pillar according to the comparison result of the roof compression strength A of the target basic vehicle type and a first preset threshold T1; if A is larger than or equal to T1, outputting the section inertia moment Ia and the all-plastic section bending moment Ma corresponding to the roof compressive strength A as the attribute parameters of each section of the final B column; and if A < T1, adjusting the B column section property parameters of the section finite element model, and returning to the step S3.
2. The method for designing a B-pillar section of an automobile according to claim 1, wherein the step S4 of adjusting the B-pillar section property parameters includes:
under the condition that the section of the B column of the target basic vehicle type is not changed, the B column is assumed not to generate plastic deformation, and finite element simulation analysis is carried out on a finite element model of the section of the B column to obtain the maximum contact force Fb of the pressing plate and the target basic vehicle type under the jacking working condition and the maximum bending moment Mb borne by each section;
determining the roof compressive strength B of the corresponding target basic vehicle type according to the maximum contact force Fb;
and adjusting the attribute parameters of each section of the B column according to the comparison result of the roof compressive strength B and the first preset threshold T1 and the maximum bending moment Mb borne by each section.
3. The method for designing the section of the B-pillar of the automobile as claimed in claim 2, wherein the adjusting the property parameters of each section of the B-pillar according to the comparison result of the roof compression strength B and the first preset threshold value T1 and the maximum bending moment Mb applied to each section comprises:
if B is larger than or equal to T1, maximizing the material strength of the B column under the engineering permission, calculating the all-plastic section bending moment Mc of each section of the corresponding B column, and then adjusting the attribute parameters of each section of the B column according to the comparison result of the maximum bending moment Mb borne by each section and the all-plastic section bending moment Mc of each section;
and if B is less than T1, improving the B-pillar section moment of inertia attribute parameter of the target vehicle type.
4. The method for designing the section of the B column of the automobile as claimed in claim 3, wherein the adjusting of the property parameters of each section of the B column according to the comparison result between the maximum bending moment Mb applied to each section and the overall plastic section bending moment Mc of each section comprises:
if the maximum bending moment Mb borne by each section is larger than the all-plastic section bending moment Mc of the corresponding section, the all-plastic section bending moment of the B column is improved;
if the maximum bending moment Mb borne by each section is less than or equal to the all-plastic section bending moment Mc of the corresponding section, calculating the roof compressive strength C of the target basic vehicle model under the top pressure working condition corresponding to the maximum B-pillar material strength, and further adjusting the B-pillar section inertia moment and the all-plastic section bending moment according to the comparison result of the roof compressive strength C and a first preset threshold T1.
5. The method of claim 4, wherein the further adjusting the second moment of area and the all-plastic bending moment according to the roof compressive strength C compared to the first predetermined threshold T1 comprises:
if the difference value between C and T1 is less than or equal to a second preset threshold value T2, the all-plastic section bending moment attribute parameters of each section of the B column are not adjusted;
and if the difference value between the C and the T1 is larger than a second preset threshold value T2, the section inertia moment of the B column and the all-plastic section bending moment are improved.
6. The method for designing a B-pillar section of an automobile according to any one of claims 1-5, wherein the determination of the roof compressive strength of the target base automobile type according to the maximum contact force is specified by the following formula:
SWR＝F/m×9.81
wherein SWR is the roof compressive strength value of the target basic vehicle type, F is the maximum contact force, and m is the conditioning quality of the target basic vehicle type.
7. The method as claimed in claim 1, wherein the step S1 includes obtaining the second moment of area and the full plastic bending moment of area of the four upper sections of the target base vehicle type B pillar.
8. The method for designing the B-pillar section of the automobile as claimed in claim 6, wherein T1 is the ratio of the maximum load force borne by the automobile body before the platen displacement is 126.9mm to the weight of the automobile.
9. The method of claim 6, wherein T2 is equal to 0.5.
10. A computer-readable storage medium on which a computer program is stored which, when executed by a processor, implements the method of designing a section of an automobile B-pillar according to any one of claims 1 to 9.
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