CN117708987A - Method, device, equipment and storage medium for optimizing vehicle body beam structure - Google Patents
Method, device, equipment and storage medium for optimizing vehicle body beam structure Download PDFInfo
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Abstract
The invention relates to the technical field of automobile structure optimization, and discloses a method, a device, equipment and a storage medium for optimizing a vehicle body beam structure, wherein the method comprises the following steps: converting stress data into equivalent section parameters according to a two-dimensional section model of the vehicle body beam structure; optimizing equivalent section parameters based on a two-dimensional section model to obtain section design parameters; synchronizing the section design parameters to a three-dimensional whole vehicle finite element model for checking calculation, and determining the optimized design parameters. Compared with the traditional vehicle body beam structure optimization mode, the method reduces the vehicle body beam structure into the two-dimensional section model, converts the stress data of the three-dimensional whole vehicle finite element model into the equivalent section parameters according to the two-dimensional section model, completes parameter optimization on the two-dimensional section model with small calculation amount and simple design, quickly and clearly optimizes the direction, and finally synchronously updates the three-dimensional whole vehicle finite element model to the three-dimensional whole vehicle finite element model of the vehicle to determine the corresponding optimized design parameters, thereby effectively improving the optimization efficiency.
Description
Technical Field
The invention relates to the technical field of automobile structure optimization, in particular to a method, a device, equipment and a storage medium for optimizing a vehicle body beam structure.
Background
The space in the automobile comprises the local space dimension indexes such as the total volume in the automobile, the volume of a carriage body, the shoulder and the like, and is used as an important index of the automobile ergonomic engineering, so that riding driving, comfort and safety are affected, and the method has important significance for automobile design. The automobile body mainly comprises various complex beam structures, and the structural performance of the automobile body comprises the performances of rigidity, durability, mode and the like of the automobile body structure. With the increasing requirements of users on automobile comfort and the like, higher requirements are put forward on the performance of the automobile body structure, and in the automobile body design, the overall or partial beam structure of the automobile body needs to be optimized according to different design technical indexes such as automobile body rigidity and the like.
The white car body structure design contains a plurality of influencing factors, and belongs to the multi-variable and multi-objective optimization problem. The design of body-in-white structures, including the design of various different properties such as overall body mass, stiffness, and modal, is a typical multi-objective optimization problem. When the beam section with complex layer thickness designed for materials such as multi-layer sheet metal is optimized, on the original design structure of a whole vehicle-level finite element simulation calculation model such as a white vehicle body, calculation is generally performed by means of adjusting the thickness of part sheet metal parts, adding structural parts and the like according to simulation results and engineering experience, so that the design results reach the expected targets.
However, the traditional optimization mode of the complex cross section beam structure of the automobile body has the problems of complicated calculation, easy error, large calculation amount, time consumption and labor consumption, has lower efficiency for short development period projects such as vehicle type modification, architecture upgrading and the like, and is difficult to adapt to the short period design optimization projects.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for optimizing a vehicle body beam structure, and aims to solve the technical problems of complex calculation, easy error, large calculation amount, time consumption and labor consumption in a traditional vehicle body complex section beam structure optimizing mode.
In order to achieve the above object, the present invention provides a method for optimizing a vehicle body beam structure, the method comprising the steps of:
converting stress data of a three-dimensional whole vehicle finite element model into equivalent section parameters according to a two-dimensional section model of a vehicle body beam structure;
optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure;
synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle, checking and calculating, and determining the optimized design parameters corresponding to the vehicle body beam structure.
Optionally, the optimizing the equivalent section parameter based on the two-dimensional section model to obtain a section design parameter of the vehicle body beam structure includes:
designing variable parameters of a target area of the body beam structure based on the two-dimensional section model;
adjusting the variable parameters through a preset section design tool according to the equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters;
and carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure.
Optionally, the performing design optimization on the adjustment parameter to obtain a section design parameter of the vehicle body beam structure includes:
determining an adjustment result of the adjustment parameter;
comparing the adjustment results, and judging whether the optimal adjustment result reaches a preset expected result or not;
and when the optimal adjustment result reaches the preset expected result, taking the adjustment parameter corresponding to the preset expected result as the section design parameter of the vehicle body beam structure.
Optionally, the converting stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model of the vehicle body beam structure includes:
Screening the vehicle body beam structure according to the design working condition to obtain a screened beam structure;
constructing a cross section of the screening beam structure to obtain a two-dimensional cross section model corresponding to the screening beam structure;
determining a target working condition of the screening beam structure;
and converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition.
Optionally, the converting stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition includes:
converting the target working condition into a two-dimensional optimization coefficient corresponding to the two-dimensional section model;
stress data of the three-dimensional whole vehicle finite element model are obtained;
and carrying out equivalent transformation on the stress data according to the two-dimensional optimization coefficient based on the two-dimensional section model to obtain equivalent section parameters of the vehicle body beam structure.
Optionally, the synchronizing the section design parameter to the three-dimensional whole vehicle finite element model of the vehicle performs checking calculation, and determining the optimized design parameter corresponding to the vehicle body beam structure includes:
synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle;
Determining a calculation result of the section design parameter based on the three-dimensional whole vehicle finite element model;
and performing design checking calculation on the calculation result to determine the optimized design parameters corresponding to the vehicle body beam structure.
Optionally, the performing design checking calculation on the calculation result to determine an optimal design parameter corresponding to the vehicle body beam structure includes:
judging whether the calculation result reaches a target parameter;
updating the section design parameters when the calculated result does not reach the target parameters;
and taking the section design parameter corresponding to the target parameter as the optimal design parameter of the vehicle body beam structure until the calculated result reaches the target parameter.
In addition, in order to achieve the above object, the present invention also proposes a vehicle body beam structure optimizing apparatus, the apparatus comprising:
the parameter conversion module is used for converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model of the vehicle body beam structure;
the parameter optimization module is used for optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure;
And the model checking module is used for synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle to check and calculate, and determining the optimized design parameters corresponding to the vehicle body beam structure.
In addition, in order to achieve the above object, the present invention also proposes a vehicle body beam structure optimizing apparatus comprising: the system comprises a memory, a processor and a body beam structure optimization program stored on the memory and operable on the processor, the body beam structure optimization program configured to implement the steps of the body beam structure optimization method as described above.
In addition, in order to achieve the above object, the present invention also proposes a storage medium having stored thereon a vehicle body beam structure optimization program which, when executed by a processor, implements the steps of the vehicle body beam structure optimization method as described above.
Firstly, converting stress data of a three-dimensional whole vehicle finite element model into equivalent section parameters according to a two-dimensional section model of a vehicle body beam structure; then optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure; and finally, synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle for checking and calculating, and determining the optimized design parameters corresponding to the vehicle body beam structure. According to the invention, the vehicle body beam structure is reduced to the two-dimensional section model, then the stress data of the three-dimensional whole vehicle finite element model is converted into the equivalent section parameters according to the two-dimensional section model, so that the conditions of complicated calculation, high calculation amount, time consumption and labor consumption of the traditional vehicle body complex section beam structure optimization mode are avoided, parameter optimization is completed on the two-dimensional section model with small calculation amount and simpler design, the optimization direction can be quickly and definitely realized, and finally the optimization direction is synchronously updated to the three-dimensional whole vehicle finite element model of the vehicle to determine the corresponding optimization design parameters, and the optimization efficiency is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a vehicle body beam structure optimization apparatus for a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of the method for optimizing a body beam structure according to the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of the method for optimizing a body beam structure of the present invention;
FIG. 4 is a schematic flow chart of a third embodiment of the method for optimizing a body beam structure according to the present invention;
FIG. 5 is a schematic view of a third embodiment of a method for optimizing a vehicle body beam structure according to the present invention, in which a three-dimensional problem is converted into a two-dimensional problem;
FIG. 6 is an overall flow chart of design optimization in a third embodiment of the body beam structure optimization method of the present invention;
fig. 7 is a block diagram showing the structure of a first embodiment of the body beam structure optimizing apparatus of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle body beam structure optimizing apparatus of a hardware running environment according to an embodiment of the present invention.
As shown in fig. 1, the vehicle body beam structure optimizing apparatus may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 1 does not constitute a limitation of the body beam structure optimizing apparatus, and may include more or fewer components than shown, or certain components in combination, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a body beam structure optimization program may be included in the memory 1005 as one type of storage medium.
In the body beam structure optimization apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the vehicle body beam structure optimizing device of the present invention may be disposed in the vehicle body beam structure optimizing device, and the vehicle body beam structure optimizing device invokes the vehicle body beam structure optimizing program stored in the memory 1005 through the processor 1001, and executes the vehicle body beam structure optimizing method provided by the embodiment of the present invention.
The embodiment of the invention provides a vehicle body beam structure optimization method, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the vehicle body beam structure optimization method.
In this embodiment, the method for optimizing the vehicle body beam structure includes the following steps:
Step S10: and converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model of the vehicle body beam structure.
It should be noted that, the execution body of the method of the present embodiment may be a computing service device with functions of data conversion, parameter optimization and model checking, for example, a personal computer, a server, or other electronic devices capable of implementing the same or similar functions, for example, the vehicle body beam structure optimization device, which is not limited in this embodiment. Here, the present embodiment and the following embodiments will be specifically described with the above-described vehicle body beam structure optimizing apparatus (abbreviated as optimizing apparatus).
It is understood that a body beam structure is a support structure for an automotive body, and is mainly used to disperse and carry various forces and pressures generated during running of a vehicle to ensure stability and safety of the body. The automobile body beam structure can generally comprise a front cross beam, a rear cross beam, side skirtboards, an automobile top beam and the like, and the rigidity and the strength of an automobile body can be effectively improved through reasonable design of the automobile body beam structure, so that the safety and riding comfort of the whole automobile are improved.
It should be understood that a two-dimensional cross-sectional model is a model that simplifies and abstracts the cross-section of a body beam structure. The body beam structure is generally a three-dimensional complex system, so that for simplifying calculation and understanding, it can be cut out on a certain section and abstracted into a two-dimensional model, for example, the two-dimensional model is simplified into basic shapes such as straight lines, rectangles, circles and the like, and then parameters such as area, moment of inertia and the like of the section are calculated according to the basic shapes. Based on the two-dimensional section model, the strength, rigidity, vibration characteristics and the like of the vehicle structure can be conveniently analyzed, and calculation and understanding are simplified.
It is understood that the stress data is data of stress conditions experienced by various parts and components in the simulated whole vehicle structure. Stress refers to the degree of internal deformation of an object that occurs after it is subjected to a force that describes the interaction between molecules within the material. By analyzing the stress data of the whole vehicle model, the structural strength and stability of the vehicle under different loads and working conditions can be evaluated.
The equivalent section parameters are equivalent parameters for converting the stress data of the three-dimensional whole vehicle finite element model into the two-dimensional data of the vehicle, and the design adjustment is carried out on the two-dimensional section model by adopting a reduced order method, so that the design adjustment steps are fewer, the structure adjustment change points of the vehicle body are more visual, the misoperation can be greatly reduced, and the design rework rate is reduced.
In particular implementations, the need to design improved body beam structures, such as front cross members, rear cross members, side skirts, roof rails, etc., may be determined based on actual design requirements. The optimization equipment can simplify and abstract the vehicle body beam structure on the section to obtain a two-dimensional section model, so that the strength, the rigidity, the vibration characteristics and the like of the vehicle structure can be conveniently analyzed, and the calculation and the understanding are simplified. And then the stress data of the three-dimensional whole vehicle finite element model can be converted into equivalent section parameters according to the two-dimensional section model, and design adjustment is carried out on the two-dimensional section model by adopting a reduced-order method, so that the number of design adjustment steps is small, the structure adjustment change points of the vehicle body are more visual, misoperation can be greatly reduced, and the design rework rate is reduced.
Step S20: and optimizing the equivalent section parameters based on the two-dimensional section model to obtain the section design parameters of the vehicle body beam structure.
The cross-section design parameters are designed to determine the cross-section shape and size (such as cross-section moment of inertia, cross-section plate thickness, cavity size, cross-section size, etc.) of the vehicle body beam structure on the premise of meeting the requirements of strength, rigidity, stability, etc.
In a specific implementation, the optimizing equipment can analyze and optimize the variables such as the thickness of the cross-section plate, the size of the cavity, the cross-section size and the like correspondingly adjusted according to the actual design improvement direction, so as to obtain the cross-section design parameters of the vehicle body beam structure.
Step S30: synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle, checking and calculating, and determining the optimized design parameters corresponding to the vehicle body beam structure.
The three-dimensional whole vehicle finite element model is a three-dimensional simulation model which is built by finite element analysis and comprises vehicle body, chassis, engine, suspension system and other vehicle structural parts in the automobile engineering. By analyzing and optimizing the model, the automobile can be improved, and the design of the automobile can be optimized.
It can be understood that the optimal design parameters are parameters determined by checking the cross-section design parameters through a three-dimensional whole vehicle finite element model, such as a cross-section moment of inertia, a cross-section plate thickness, a cavity size, a cross-section size and the like.
In a specific implementation, the optimization equipment can synchronously update the two-dimensional section design parameters to a three-dimensional whole vehicle finite element model and perform design checking calculation, and when the checking calculation result meets the target, the design optimization is considered to be completed, and the optimization design parameters corresponding to the vehicle body beam structure are determined. Therefore, the result of the three-dimensional whole vehicle finite element model can be equivalently converted into parameters of a two-dimensional section model, and optimization is completed on the two-dimensional section model with small calculated amount and simple design change.
The present embodiment can determine that an improved vehicle body beam structure, such as a front cross member, a rear cross member, a side skirt, a roof rail, etc., needs to be designed according to actual design requirements. The optimization equipment can simplify and abstract the vehicle body beam structure on the section to obtain a two-dimensional section model, so that the strength, the rigidity, the vibration characteristics and the like of the vehicle structure can be conveniently analyzed, and the calculation and the understanding are simplified. And then the stress data of the three-dimensional whole vehicle finite element model can be converted into equivalent section parameters according to the two-dimensional section model, and design adjustment is carried out on the two-dimensional section model by adopting a reduced-order method, so that the number of design adjustment steps is small, the structure adjustment change points of the vehicle body are more visual, the misoperation can be greatly reduced, and the design rework rate is reduced. And then, analyzing and optimizing variables such as the thickness, the cavity size, the section size and the like of the section plate correspondingly adjusted according to the actual design improvement direction, and obtaining the section design parameters of the vehicle body beam structure. And finally, synchronously updating the two-dimensional section design parameters to a three-dimensional whole vehicle finite element model, performing design checking calculation, and determining the optimized design parameters corresponding to the vehicle body beam structure when the checking calculation result meets the target. According to the method, the device and the system, the vehicle body beam structure is reduced to be a two-dimensional section model, then the stress data of the three-dimensional whole vehicle finite element model is converted into equivalent section parameters according to the two-dimensional section model, the design optimization speed of the complex beam section can be higher through the two-dimensional equivalent section parameters, the situations that the traditional vehicle body complex section beam structure optimization mode is complex in calculation, easy to make mistakes, large in calculation amount, time-consuming and labor-consuming are avoided, parameter optimization is completed on the two-dimensional section model which is small in calculation amount and simpler in design, the direction can be quickly and clearly optimized, and finally the optimization direction is synchronously updated to the three-dimensional whole vehicle finite element model of the vehicle to determine corresponding optimization design parameters, and the optimization efficiency is effectively improved.
Referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the method for optimizing a vehicle body beam structure according to the present invention.
Based on the first embodiment, in this embodiment, the step S20 includes:
step S21: and designing variable parameters of a target area of the vehicle body beam structure based on the two-dimensional section model.
The variable parameters of the target region are variables such as the thickness of the cross-sectional plate, the size of the cavity, the cross-sectional dimension, and the like, which determine the region of the body beam structure to be designed and improved according to the actual design requirements.
Step S22: and adjusting the variable parameters through a preset section design tool according to the equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters.
Step S23: and carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure.
The preset section design tool is a tool preset in the optimizing device for adjusting the variable parameter, for example, a hyperseam, a CROSS tool of ANSA software, or may be a calculation plug-in based on Matlab software, which is not limited in this embodiment.
The adjustment method mainly depends on the section design tool used, for example, the height or width of the beam section can be adjusted for the equivalent section parameters and the optimization direction.
In a specific implementation, the optimization device may design variable parameters of the target area of the body beam structure, such as a variable of a cross-sectional panel thickness, a cavity size, a cross-sectional dimension, and the like, based on the two-dimensional cross-sectional model. And then adjusting the variable parameters through a preset section design tool (such as a Hyperbeam, a CROSS tool of ANSA software, or a calculation plug-in based on Matlab software, or the like) and equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters. And finally, carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure. Therefore, design optimization can be performed through equivalent section parameters, the optimization direction can be quickly and clearly determined, and the optimization efficiency is effectively improved.
Further, in the present embodiment, step S23 includes: determining an adjustment result of the adjustment parameter; comparing the adjustment results, and judging whether the optimal adjustment result reaches a preset expected result or not; and when the optimal adjustment result reaches the preset expected result, taking the adjustment parameter corresponding to the preset expected result as the section design parameter of the vehicle body beam structure.
It should be noted that the preset expected result is a design result preset in the optimizing device to meet the expectation. In general, the design of a vehicle beam structure is completed according to experience or functional requirements at the beginning, so that the simulation verification or optimization of the original structure has more or less design redundancy or design deviation, and the so-called design optimization is to find out the design variable parameters with better result performance according to the adjustment result compared with the original design result.
It can be understood that, for the simple process of comparing the adjustment results, the calculation results of the adjustment parameters are compared with the original design results to find the parameters with better results. For example, an input parameter is changed, such as a side length of 1: rectangle of 1, becomes 1:2, the result of the adjustment is the area (assuming that the variable parameter under consideration is the area). And comparing the obtained result with the original result, and if the obtained result meets the inspected target (the area coefficient of the variable parameter needs to be increased), considering that the adjustment parameter is better than the original adjustment parameter. For example, the optimized parameter is more than 105% of the original parameter, which mainly depends on the three-dimensional design target, and the improvement of the general two-dimensional design target has a relatively small shrinkage in the three-dimensional model verification, so that a larger improvement can be required.
In a specific implementation, the design of the prototype is generally performed according to experience or functional requirements at the beginning of the structural design of a certain vehicle beam, so that the simulation verifies or optimizes the initial structure to have more or less design redundancy or design deviation. Thus, the optimizing device may first determine the adjustment result of the adjustment parameter; finding out an adjusting parameter with better result expression compared with the original design result according to the adjusting result, and judging whether the optimal adjusting parameter reaches a preset expected result or not; and when the optimal adjustment parameters reach the preset expected result, taking the adjustment parameters corresponding to the preset expected result as the section design parameters of the vehicle body beam structure. Therefore, the optimization design period can be shortened, and the project process can be further accelerated.
The optimizing device of the embodiment can design variable parameters of the target area of the vehicle body beam structure, such as the variables of the thickness of the section plate, the size of the cavity, the section size and the like, based on the two-dimensional section model. And then adjusting the variable parameters through a preset section design tool (such as a Hyperbeam, a CROSS tool of ANSA software, or a calculation plug-in based on Matlab software, or the like) and equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters. And finally, carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure. Therefore, design optimization can be performed through equivalent section parameters, the optimization direction can be quickly and clearly determined, and the optimization efficiency is effectively improved. Further, the design of the embryonic form is generally accomplished empirically or functionally at the beginning of the design of a certain vehicle beam structure, so there is more or less design redundancy or design bias in the simulation verifying or optimizing the original structure. Thus, the optimizing device may first determine the adjustment result of the adjustment parameter; finding out an adjusting parameter with better result expression compared with the original design result according to the adjusting result, and judging whether the optimal adjusting parameter reaches a preset expected result or not; and when the optimal adjustment parameters reach the preset expected result, taking the adjustment parameters corresponding to the preset expected result as the section design parameters of the vehicle body beam structure. Therefore, the optimization design period can be shortened, and the project process can be further accelerated.
Referring to fig. 2 and 4, fig. 4 is a schematic flow chart of a third embodiment of the method for optimizing a vehicle body beam structure according to the present invention.
Based on the above embodiments, in this embodiment, the step S10 includes:
step S11: and screening the vehicle body beam structure according to the design working condition to obtain a screening beam structure.
The design condition is a condition requiring design improvement of the vehicle body beam structure. The main working structure path of the body beam structure can be screened according to the original calculation result. For example, when the side pillar collision working condition is the target working condition, main transmission structures such as a threshold beam and a B pillar are required to be screened as follow-up key optimal design objects aiming at the side pillar collision working condition.
Step S12: and constructing the cross section of the screening beam structure to obtain a two-dimensional cross section model corresponding to the screening beam structure.
Step S13: and determining the target working condition of the screening beam structure.
Step S14: and converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition.
In a specific implementation, the optimizing device may screen the main working structure path of the vehicle body beam structure according to the original calculation result. And establishing a section model (the section model can be established by using a section design functional module of mainstream processing software, such as a CROSS section design function of ANSA, and the like) aiming at the screened beam structure, and then converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters (section moment of inertia, and the like) according to the target working condition of the screened beam structure as a design evaluation direction.
Further, in the present embodiment, step S14 includes: converting the target working condition into a two-dimensional optimization coefficient corresponding to the two-dimensional section model; stress data of the three-dimensional whole vehicle finite element model are obtained; and carrying out equivalent transformation on the stress data according to the two-dimensional optimization coefficient based on the two-dimensional section model to obtain equivalent section parameters of the vehicle body beam structure.
It should be noted that, the two-dimensional optimization coefficient is an optimization coefficient obtained for a specific performance index or target reduction of the vehicle beam structure when the vehicle beam structure is subjected to structural optimization design.
It is understood that the stress data is data of stress conditions experienced by various parts and components in the simulated whole vehicle structure. Stress refers to the degree of internal deformation of an object that occurs after it is subjected to a force that describes the interaction between molecules within the material. By analyzing the stress data of the whole vehicle model, the structural strength and stability of the vehicle under different loads and working conditions can be evaluated.
In practical implementation, taking fig. 5 as an example, fig. 5 is a schematic view of a scenario in which a three-dimensional problem is converted into a two-dimensional problem in a third embodiment of the vehicle body beam structure optimization method according to the present invention. As known from the positive stress intensity condition, the bending resistance of the beam depends on the bending resistance section coefficient WZ, and in order to improve the bending resistance of the beam, the beam section of the beam structure can be optimized to find a reasonable section so as to achieve the purposes of improving the intensity and saving materials. The ratio can be used as a measure for measuring whether the section is reasonable, namely, the ratio of the bending resistance section coefficient WZ to the section area is as follows:
The larger the value, the more reasonable the cross section tends to be. As shown in fig. 5, when optimizing a vehicle body beam structure, design optimization can be performed by calculating WZ coefficients of beam sections of different designs. The present embodiment converts the problem of three-dimensional angle into an optimization problem of two-dimensional angle for which the two-dimensional optimization coefficient is the optimized WZ coefficient. I.e. it is necessary to make bh 2 If there are no remaining constraint limits, the value of WZ can be increased by increasing the value of h or b. The same is true for the structural optimization of a body beam of a motor vehicle, in the same manner as described above, e.g. for a frontal collision workerThe design target of deformation, shrinkage and displacement of the front anti-collision beam can be reduced, and the design target can be converted into the design target of improving the bending rigidity of the front anti-collision beam, namely improving the bending coefficient of the two-dimensional section of the front anti-collision beam, so that the final design purpose is realized by curves.
Further, in the present embodiment, step S30 includes: synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle; determining a calculation result of the section design parameter based on the three-dimensional whole vehicle finite element model; and performing design checking calculation on the calculation result to determine the optimized design parameters corresponding to the vehicle body beam structure.
It should be noted that, the final objective of the optimizing device is that the cross-section design parameters corresponding to the three-dimensional whole vehicle finite element model are more excellent, and the design optimization can be considered to be completed when the final objective is met by returning the cross-section design parameters optimized by the two-dimensional cross-section model to the three-dimensional whole vehicle finite element model for checking. Taking a vehicle threshold beam structure as an example, the excellent section design parameters can be said to be the variable parameters such as thickness and the like are updated to the threshold beam model parameters of the three-dimensional whole vehicle finite element model, then the calculation result is compared with the new section design parameter result and the calculation result of the original whole vehicle model design scheme, and then whether the new section design parameter result meets the target parameters or not is evaluated.
In the specific implementation, when the result of the new section design parameters shows excellent performance, correspondingly updating the three-dimensional whole vehicle finite element model and carrying out design checking calculation, otherwise, further searching for more excellent section design schemes; when the result of the inspection of the design result in the three-dimensional whole vehicle finite element model meets the target, the design optimization can be considered to be completed, otherwise, more excellent section design parameters need to be further explored. Thereby improving the applicability of the section design scheme in the three-dimensional whole vehicle finite element model.
Further, in this embodiment, performing design checking on the calculation result to determine an optimal design parameter corresponding to the vehicle body beam structure includes: judging whether the calculation result reaches a target parameter; updating the section design parameters when the calculated result does not reach the target parameters; and taking the section design parameter corresponding to the target parameter as the optimal design parameter of the vehicle body beam structure until the calculated result reaches the target parameter.
It should be noted that, the target parameter is a preset parameter for achieving an optimization result, for example, for a column collision working condition, the target under the working condition is to ensure a survival space of an occupant, and the space can be generally quantized into an intrusion amount, that is, a displacement amount of a certain position of a certain structural part collapsing into the survival space.
The obtained section design parameters are finally synchronously updated to the three-dimensional whole vehicle finite element model for calculation, the final optimization purpose is to optimize the three-dimensional design, and the checking calculation is whether the updated three-dimensional whole vehicle finite element model calculation result meets the three-dimensional design target. If yes, taking the vehicle body beam structure as an optimal design parameter of the vehicle body beam structure; if not, further optimization of the two-dimensional cross-sectional design parameters is required. For example, the goal of the frontal collision condition conversion is to lift the cross section WZ, the result of the actual three-dimensional frontal collision of the whole vehicle is the crumple displacement value of the front anti-collision beam, and then the final investigation is to investigate whether the displacement value accords with the optimized goal (if the optimized goal is to reduce the crumple displacement value by 20mm compared with the original design scheme, the new cross section design parameter is reduced by 21mm compared with the original design scheme in the three-dimensional model calculation result, so that the optimized design goal can be considered to be achieved).
In a specific implementation, the target parameters herein do not refer to a certain working condition or design target, and the target in the target parameters may be a certain parameter or a certain condition, and the target parameters are generally considered in a quantitative manner in the form of parameters, for example, the column collision working condition is safe, the target under the working condition is to ensure the survival space of the passenger, and the space can be generally quantized into an intrusion amount, that is, the displacement amount of a certain position of a certain structural part collapsing into the survival space. And updating the section design parameters when the calculated result does not reach the target parameters, and taking the section design parameters corresponding to the reached target parameters as the optimized design parameters of the vehicle body beam structure until the calculated result reaches the target parameters. Therefore, the design scheme obtained by the target parameter is more excellent than the original scheme in terms of a certain result parameter on the three-dimensional whole vehicle finite element model, or achieves the optimal expected target, for example, the design scheme is improved by 10% compared with the original design scheme. Then the goal may be considered to be met.
For ease of understanding, referring to fig. 6, fig. 6 is an overall flowchart of design optimization in a third embodiment of the vehicle body beam structure optimization method of the present invention. As shown in fig. 6, when the design of the automobile body is optimized for structural design with respect to one or more indexes, the main path beam structure of the stress transmission of the automobile body can be screened (for example, the main transmission structures such as a threshold beam and a B-pillar are required to be screened as the subsequent key optimization design objects with respect to the side pillar collision working condition). And then a two-dimensional section model is built for the screened three-dimensional body beam structure (the section model can be built by using a section design function module of mainstream processing software, such as a CROSS section design function of ANSA, and the like). And then converting the stress analysis result of the three-dimensional whole vehicle finite element model into equivalent section parameters (such as section moment of inertia and the like). And then, according to the design evaluation direction of the target working condition, carrying out parameter design calculation analysis and optimization on the two-dimensional section model by utilizing a section design tool, and correspondingly adjusting the variables such as the thickness of the section plate, the size of the cavity, the section size and the like. And comparing whether the new design is more excellent than the original design, when the new section design parameter result is excellent, updating, analyzing and carrying out design checking calculation on the three-dimensional whole vehicle finite element model according to the optimized section design parameter, otherwise, further searching the more excellent section design parameter is needed. And finally, whether the result meets the target is analyzed through the three-dimensional vehicle body model, and when the result of checking the design result in the three-dimensional vehicle finite element model meets the target, the design optimization is considered to be completed, otherwise, more excellent section design schemes are required to be further explored.
The optimizing device of the embodiment can screen the main working structure path of the vehicle body beam structure according to the original calculation result. And establishing a section model (the section model can be established by using a section design functional module of mainstream processing software, such as a CROSS section design function of ANSA, and the like) aiming at the screened beam structure, and then converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters (section moment of inertia, and the like) according to the target working condition of the screened beam structure as a design evaluation direction. Further, when the result of the new section design parameters shows excellent performance, correspondingly updating the three-dimensional whole vehicle finite element model and carrying out design checking calculation, otherwise, further searching for more excellent section design schemes; when the result of the inspection of the design result in the three-dimensional whole vehicle finite element model meets the target, the design optimization can be considered to be completed, otherwise, more excellent section design parameters need to be further explored. Thereby improving the applicability of the section design scheme in the three-dimensional whole vehicle finite element model. Furthermore, the target parameters herein do not refer to a certain working condition or design target, and the target in the target parameters may be a certain parameter or a certain condition, and the target parameters are generally quantitatively examined in the form of parameters, for example, the column collision working condition is safe, the target under the working condition is to ensure the survival space of the passenger, and the space can be generally quantized into an intrusion amount, that is, the displacement amount of a certain position of a certain structural part collapsing into the survival space. And updating the section design parameters when the calculated result does not reach the target parameters, and taking the section design parameters corresponding to the reached target parameters as the optimized design parameters of the vehicle body beam structure until the calculated result reaches the target parameters. Therefore, the design scheme which is obtained according with the target parameters is more excellent than the original scheme in terms of a certain result parameter on the three-dimensional whole vehicle finite element model. The result of the three-dimensional model is converted into parameters of the two-dimensional section through skillfully utilizing reduced thought, optimization is completed on the two-dimensional section model with small calculated amount and simple design change, and then the two-dimensional section model is synchronously updated to the three-dimensional model for result verification. The key problems of time and labor consumption caused by the traditional optimization method such as one-to-one calculation, whole body pulling and the like are greatly solved, and the optimization efficiency is effectively improved.
In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium stores a vehicle body beam structure optimization program, and the vehicle body beam structure optimization program realizes the steps of the vehicle body beam structure optimization method when being executed by a processor.
Referring to fig. 7, fig. 7 is a block diagram showing a first embodiment of the vehicle body beam structure optimizing apparatus of the present invention.
As shown in fig. 7, the vehicle body beam structure optimizing device provided by the embodiment of the invention includes:
the parameter conversion module 701 is configured to convert stress data of a three-dimensional whole vehicle finite element model into equivalent section parameters according to a two-dimensional section model of a vehicle body beam structure;
the parameter optimization module 702 is configured to optimize the equivalent section parameter based on the two-dimensional section model, so as to obtain a section design parameter of the vehicle body beam structure;
and the model checking module 703 is used for synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle to check and calculate, and determining the optimized design parameters corresponding to the vehicle body beam structure.
The present embodiment can determine that an improved vehicle body beam structure, such as a front cross member, a rear cross member, a side skirt, a roof rail, etc., needs to be designed according to actual design requirements. The optimization equipment can simplify and abstract the vehicle body beam structure on the section to obtain a two-dimensional section model, so that the strength, the rigidity, the vibration characteristics and the like of the vehicle structure can be conveniently analyzed, and the calculation and the understanding are simplified. And then the stress data of the three-dimensional whole vehicle finite element model can be converted into equivalent section parameters according to the two-dimensional section model, and design adjustment is carried out on the two-dimensional section model by adopting a reduced-order method, so that the number of design adjustment steps is small, the structure adjustment change points of the vehicle body are more visual, the misoperation can be greatly reduced, and the design rework rate is reduced. And then, analyzing and optimizing variables such as the thickness, the cavity size, the section size and the like of the section plate correspondingly adjusted according to the actual design improvement direction, and obtaining the section design parameters of the vehicle body beam structure. And finally, synchronously updating the two-dimensional section design parameters to a three-dimensional whole vehicle finite element model, performing design checking calculation, and determining the optimized design parameters corresponding to the vehicle body beam structure when the checking calculation result meets the target. According to the method, the device and the system, the vehicle body beam structure is reduced to be a two-dimensional section model, then the stress data of the three-dimensional whole vehicle finite element model is converted into equivalent section parameters according to the two-dimensional section model, the design optimization speed of the complex beam section can be higher through the two-dimensional equivalent section parameters, the situations that the traditional vehicle body complex section beam structure optimization mode is complex in calculation, easy to make mistakes, large in calculation amount, time-consuming and labor-consuming are avoided, parameter optimization is completed on the two-dimensional section model which is small in calculation amount and simpler in design, the direction can be quickly and clearly optimized, and finally the optimization direction is synchronously updated to the three-dimensional whole vehicle finite element model of the vehicle to determine corresponding optimization design parameters, and the optimization efficiency is effectively improved.
Based on the first embodiment of the vehicle body beam structure optimizing device of the present invention, a second embodiment of the vehicle body beam structure optimizing device of the present invention is proposed.
In this embodiment, the parameter optimization module 702 is further configured to design a variable parameter of a target area of the body beam structure based on the two-dimensional section model; adjusting the variable parameters through a preset section design tool according to the equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters; and carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure.
Further, the parameter optimization module 702 is further configured to determine an adjustment result of the adjustment parameter; comparing the adjustment results, and judging whether the optimal adjustment result reaches a preset expected result or not; and when the optimal adjustment result reaches the preset expected result, taking the adjustment parameter corresponding to the preset expected result as the section design parameter of the vehicle body beam structure.
Further, the parameter conversion module 701 is further configured to screen the vehicle body beam structure according to a design working condition, so as to obtain a screened beam structure; constructing a cross section of the screening beam structure to obtain a two-dimensional cross section model corresponding to the screening beam structure; determining a target working condition of the screening beam structure; and converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition.
Further, the parameter conversion module 701 is further configured to convert the target working condition into a two-dimensional optimization coefficient corresponding to the two-dimensional section model; stress data of the three-dimensional whole vehicle finite element model are obtained; and carrying out equivalent transformation on the stress data according to the two-dimensional optimization coefficient based on the two-dimensional section model to obtain equivalent section parameters of the vehicle body beam structure.
Further, the model checking module 703 is further configured to synchronize the section design parameter to a three-dimensional whole vehicle finite element model of the vehicle; determining a calculation result of the section design parameter based on the three-dimensional whole vehicle finite element model; and performing design checking calculation on the calculation result to determine the optimized design parameters corresponding to the vehicle body beam structure.
Further, the model checking module 703 is further configured to determine whether the calculation result reaches a target parameter; updating the section design parameters when the calculated result does not reach the target parameters; and taking the section design parameter corresponding to the target parameter as the optimal design parameter of the vehicle body beam structure until the calculated result reaches the target parameter.
Other embodiments or specific implementation manners of the vehicle body beam structure optimizing device of the present invention may refer to the above method embodiments, and are not described herein again.
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 one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. read-only memory/random-access memory, magnetic disk, optical disk), comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A vehicle body beam structure optimization method, characterized in that the vehicle body beam structure optimization method comprises:
converting stress data of a three-dimensional whole vehicle finite element model into equivalent section parameters according to a two-dimensional section model of a vehicle body beam structure;
optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure;
synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle, checking and calculating, and determining the optimized design parameters corresponding to the vehicle body beam structure.
2. The method for optimizing a vehicle body beam structure according to claim 1, wherein the optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure comprises:
designing variable parameters of a target area of the body beam structure based on the two-dimensional section model;
Adjusting the variable parameters through a preset section design tool according to the equivalent section parameters to obtain adjustment parameters corresponding to the variable parameters;
and carrying out design optimization on the adjustment parameters to obtain the section design parameters of the vehicle body beam structure.
3. The method for optimizing a vehicle body beam structure according to claim 2, wherein the performing design optimization on the adjustment parameters to obtain the cross-sectional design parameters of the vehicle body beam structure includes:
determining an adjustment result of the adjustment parameter;
comparing the adjustment results, and judging whether the optimal adjustment result reaches a preset expected result or not;
and when the optimal adjustment result reaches the preset expected result, taking the adjustment parameter corresponding to the preset expected result as the section design parameter of the vehicle body beam structure.
4. The method for optimizing a vehicle body beam structure according to claim 1, wherein the converting stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model of the vehicle body beam structure comprises:
screening the vehicle body beam structure according to the design working condition to obtain a screened beam structure;
Constructing a cross section of the screening beam structure to obtain a two-dimensional cross section model corresponding to the screening beam structure;
determining a target working condition of the screening beam structure;
and converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition.
5. The method for optimizing a vehicle body beam structure according to claim 4, wherein the converting stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model and the target working condition comprises:
converting the target working condition into a two-dimensional optimization coefficient corresponding to the two-dimensional section model;
stress data of the three-dimensional whole vehicle finite element model are obtained;
and carrying out equivalent transformation on the stress data according to the two-dimensional optimization coefficient based on the two-dimensional section model to obtain equivalent section parameters of the vehicle body beam structure.
6. The method for optimizing a vehicle body beam structure according to claim 1, wherein the step of synchronizing the cross-sectional design parameters to a three-dimensional whole vehicle finite element model of the vehicle to perform checking calculation, and the step of determining the optimized design parameters corresponding to the vehicle body beam structure comprises the steps of:
Synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle;
determining a calculation result of the section design parameter based on the three-dimensional whole vehicle finite element model;
and performing design checking calculation on the calculation result to determine the optimized design parameters corresponding to the vehicle body beam structure.
7. The method for optimizing a vehicle body beam structure according to claim 6, wherein the performing design checking on the calculation result to determine the optimized design parameters corresponding to the vehicle body beam structure comprises:
judging whether the calculation result reaches a target parameter;
updating the section design parameters when the calculated result does not reach the target parameters;
and taking the section design parameter corresponding to the target parameter as the optimal design parameter of the vehicle body beam structure until the calculated result reaches the target parameter.
8. A vehicle body beam structure optimizing apparatus, characterized by comprising:
the parameter conversion module is used for converting the stress data of the three-dimensional whole vehicle finite element model into equivalent section parameters according to the two-dimensional section model of the vehicle body beam structure;
the parameter optimization module is used for optimizing the equivalent section parameters based on the two-dimensional section model to obtain section design parameters of the vehicle body beam structure;
And the model checking module is used for synchronizing the section design parameters to a three-dimensional whole vehicle finite element model of the vehicle to check and calculate, and determining the optimized design parameters corresponding to the vehicle body beam structure.
9. A vehicle body beam structure optimizing apparatus, characterized by comprising: a memory, a processor, and a body beam structure optimization program stored on the memory and executable on the processor, the body beam structure optimization program configured to implement the steps of the body beam structure optimization method of any one of claims 1 to 7.
10. A storage medium having stored thereon a body beam structure optimization program which, when executed by a processor, implements the steps of the body beam structure optimization method of any one of claims 1 to 7.
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