CN114004020B - Vehicle body structure lightweight design method, system, terminal and storage medium - Google Patents
Vehicle body structure lightweight design method, system, terminal and storage medium Download PDFInfo
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Abstract
The invention discloses a vehicle body structure lightweight design method, a system, a terminal and a storage medium, belonging to the technical field of vehicle lightweight design. This patent carries out automobile body structure lightweight design, guarantees the rationality of automobile body framework, reduces automobile body weight, further excavates structure lightweight design latent energy.
Description
Technical Field
The invention discloses a vehicle body structure lightweight design method, a vehicle body structure lightweight design system, a vehicle body structure lightweight design terminal and a storage medium, and belongs to the technical field of vehicle lightweight design.
Background
The development of automobile development technology makes competition between automobile enterprises more and more intense. How to achieve performance goals while shortening development cycle and reducing development cost becomes a new challenge facing autonomous Chinese enterprises. With the progress of simulation development technology, the role of CAE in solving the above problems is more and more significant. According to the characteristics of each structure optimization method, it becomes more and more important to comprehensively apply each optimization method to realize the light weight of the vehicle body in the forward development process of the vehicle body.
At present, the main idea of the light-weight design of a vehicle body is to firstly perform topological optimization to seek a load transfer path, then perform local section optimization, determine the size of a section and then perform material thickness optimization. The result of the topological optimization cannot be directly converted into a vehicle body structure, the section optimization and the material thickness optimization are developed based on the designed part structure, namely, the section and the material thickness are optimized based on the determined part size, and the light weight potential of the structure cannot be fully excavated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a vehicle body structure lightweight design method, a vehicle body structure lightweight design system, a vehicle body structure lightweight design terminal and a storage medium, the rationality of a vehicle body framework is ensured, the product performance is improved, the vehicle body weight is reduced, and the structural lightweight design potential is further excavated.
The technical scheme of the invention is as follows:
according to a first aspect of an embodiment of the present invention, there is provided a vehicle body structure lightweight design method including:
obtaining a finite element model of a vehicle body foundation, carrying out region fitting on the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and obtaining the initial fitting model performance of the parameterized finite element model;
optimizing the section size of the parameterized finite element model of the vehicle body to obtain an optimized finite element model of the vehicle body section and the performance of the optimized finite element model of the vehicle body section, and judging whether the performance of the optimized finite element model of the vehicle body section meets the performance index of the vehicle body;
if so, carrying out structural topological optimization on the vehicle body section optimization finite element model to obtain a topological optimization result, and obtaining a plurality of vehicle body split part finite element models through the topological optimization result and the vehicle body section optimization finite element model to obtain the initial recombination part model performance;
carrying out parameter optimization on the finite element model of the vehicle body split part to obtain a vehicle body part parameter optimization finite element model and the performance of the finite element model of the vehicle body part parameter optimization finite element model, and judging whether the performance of the finite element model of the part parameter optimization satisfies the performance index of the vehicle body;
if so, carrying out engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
Preferably, the performing region fitting through the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and performing finite element analysis on the initial fitting model performance of the parameterized finite element model of the vehicle body foundation includes:
obtaining the parameters of the finite element model of the vehicle body foundation through the finite element model of the vehicle body foundation, wherein the parameters of the finite element model of the vehicle body foundation comprise: the number, materials and material thickness of the vehicle body part structure and the vehicle body part structure are reduced;
performing region fitting through the vehicle body foundation finite element model parameters to determine vehicle body region integration finite element model parameters;
integrating parameters of the finite element model through the vehicle body area to obtain a vehicle body parameterized finite element model;
and obtaining the performance of an initial fitting model through the vehicle body parameterized finite element model.
Preferably, the optimizing the cross-sectional dimension of the parameterized finite element model of the vehicle body to obtain the optimized finite element model of the cross-sectional dimension of the vehicle body and obtain the performance of the optimized finite element model of the cross-sectional dimension of the vehicle body includes:
obtaining a plurality of model section sizes through the performance of the vehicle body parameterized finite element model and the initial fitting model;
obtaining a model section size design matrix according to a plurality of model section sizes;
obtaining performance data of a model section size sample through the model section size design matrix;
performing response surface fitting on the model section size sample performance data and the model section size design matrix, and obtaining the vehicle body section optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the section optimization finite element model through the vehicle body section optimization finite element model.
Preferably, if the performance of the cross-section optimization finite element model does not meet the performance index of the vehicle body, the cross-section dimension optimization is carried out on the vehicle body parameterized finite element model again.
Preferably, the constraint of the structural topology optimization is a vehicle body performance target, and the aim is framework weight reduction.
Preferably, the parameter optimization of the finite element model of the vehicle body splitting part to obtain the parameter optimized finite element model of the vehicle body part and the performance of the parameter optimized finite element model of the vehicle body splitting part comprises the following steps:
obtaining a plurality of part finite element model parameter ranges through the vehicle body split part finite element model and the vehicle body foundation finite element model parameters;
obtaining a part finite element model parameter range design matrix according to a plurality of part finite element model parameter ranges and the initial recombination part model performance;
obtaining sample performance data of the finite element model parameter range of the part through the finite element model parameter range design matrix of the part;
performing response surface fitting on the part finite element model parameter range sample performance data and the part finite element model parameter range design matrix, and obtaining the vehicle body part parameter optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the part parameter optimized finite element model through the vehicle body part parameter optimized finite element model.
Preferably, if the performance of the part parameter optimization finite element model does not meet the performance index of the vehicle body, the re-parameter optimization is carried out on the finite element model of the vehicle body split part, and the engineering design is carried out again when the performance of the lightweight finite element model does not meet the performance index of the vehicle body.
According to a second aspect of an embodiment of the present invention, there is provided a vehicle body structure lightweight design system, including:
the region fitting module is used for obtaining a finite element model of a vehicle body foundation, performing region fitting through the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and obtaining the initial fitting model performance of the parameterized finite element model;
the section optimization module is used for optimizing the section size of the vehicle body parameterized finite element model to obtain a vehicle body section optimized finite element model and obtain the performance of the section optimized finite element model, and judging whether the performance of the section optimized finite element model meets the performance index of the vehicle body;
the topology splitting module is used for carrying out structural topology optimization on the vehicle body section optimization finite element model to obtain a topology optimization result, and obtaining a plurality of vehicle body splitting part finite element models through the topology optimization result and the vehicle body section optimization finite element model;
the parameter optimization module is used for carrying out parameter optimization on the finite element model of the vehicle body split part to obtain a vehicle body part parameter optimization finite element model, obtaining the performance of the part parameter optimization finite element model, and judging whether the performance of the part parameter optimization finite element model meets the vehicle body performance index;
and the engineering design module is used for carrying out engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
According to a third aspect of embodiments of the present invention, there is provided a terminal, including:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
the method of the first aspect of the embodiments of the present invention is performed.
According to a fourth aspect of embodiments of the present invention, there is provided a non-transitory finite element analysis machine-readable storage medium, wherein instructions which, when executed by a processor of a terminal, enable the terminal to perform the method of the first aspect of embodiments of the present invention.
According to a fifth aspect of embodiments of the present invention, there is provided an application program product, which, when running on a terminal, causes the terminal to perform the method of the first aspect of embodiments of the present invention.
The invention has the beneficial effects that:
the patent provides a body structure lightweight design method, a system, terminal and storage medium, based on regional structure definition, build the body parameterization finite element model, carry out cross sectional dimension optimization to it, then carry out regional structure topological optimization, carry out regional structure part split design according to topological optimization, and optimize to part size and material thickness, in order to obtain the lightweight design structure who satisfies the performance requirement, guarantee the rationality of body framework, promote product performance, reduce body weight, further excavate structure lightweight design latent energy.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow diagram illustrating a method for designing a vehicle body structure for light weight according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of vehicle body structure lightweight design in accordance with an exemplary embodiment;
FIG. 3 is a block diagram of a vehicle model D pillar region in an embodiment of a method for designing a vehicle body structure with reduced weight according to an exemplary embodiment;
FIG. 4 is a diagram illustrating redefining a vehicle type D-pillar zone structure in an embodiment of a method of designing a vehicle body structure for light weight according to an exemplary embodiment;
FIG. 5 is a schematic illustration of a redefined vehicle D-pillar zone cross-sectional layout in an embodiment of a method of body structure lightweight design, according to an exemplary embodiment;
FIG. 6 is a schematic cross-sectional view of a redefined vehicle model D-pillar region in an embodiment of a vehicle body structure lightweighting design method, according to an exemplary embodiment;
FIG. 7 is a schematic diagram illustrating redefined vehicle model D-pillar zone topology optimization results in an embodiment of a vehicle body structure lightweight design method, according to an exemplary embodiment;
FIG. 8 is a block diagram illustrating a structural schematic of a vehicle body structure lightweight design system according to an exemplary embodiment;
fig. 9 is a schematic block diagram of a terminal structure shown in accordance with an example embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a vehicle body structure lightweight design method which is realized by a terminal, wherein the terminal can be a smart phone, a desktop finite element analyzer or a notebook computer and the like, and the terminal at least comprises a CPU, a voice acquisition device and the like.
Example one
Fig. 1 is a flow chart illustrating a method for designing a vehicle body structure with reduced weight, the method being used in a terminal, the method including the steps of:
101, obtaining a finite element model of a vehicle body foundation, carrying out region fitting on the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and obtaining the initial fitting model performance of the parameterized finite element model;
102, optimizing the section size of the vehicle body parameterized finite element model to obtain a vehicle body section optimized finite element model, acquiring the performance of the section optimized finite element model, and judging whether the performance of the section optimized finite element model meets the performance index of the vehicle body;
103, if so, carrying out structural topological optimization on the vehicle body section optimization finite element model to obtain a topological optimization result, and obtaining a plurality of vehicle body splitting part finite element models through the topological optimization result and the vehicle body section optimization finite element model to obtain the initial recombination part model performance;
104, performing parameter optimization on the finite element model of the vehicle body splitting part to obtain a vehicle body part parameter optimization finite element model, acquiring the performance of the part parameter optimization finite element model, and judging whether the performance of the part parameter optimization finite element model meets the vehicle body performance index;
and 105, if so, carrying out engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
Preferably, the performing region fitting through the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and performing finite element analysis on the initial fitting model performance of the parameterized finite element model of the vehicle body foundation includes:
obtaining the parameters of the finite element model of the vehicle body foundation through the finite element model of the vehicle body foundation, wherein the parameters of the finite element model of the vehicle body foundation comprise: the number, materials and material thickness of the vehicle body part structure and the vehicle body part structure are reduced;
performing region fitting through the vehicle body foundation finite element model parameters to determine vehicle body region integration finite element model parameters;
integrating the parameters of the finite element model through the vehicle body region to obtain a vehicle body parameterized finite element model;
and obtaining the performance of an initial fitting model through the vehicle body parameterized finite element model.
Preferably, the optimizing the cross-sectional dimension of the parameterized finite element model of the vehicle body to obtain the optimized finite element model of the cross-sectional dimension of the vehicle body and obtain the performance of the optimized finite element model of the cross-sectional dimension of the vehicle body includes:
obtaining a plurality of model section sizes through the performance of the vehicle body parameterized finite element model and the initial fitting model;
obtaining a model section size design matrix according to a plurality of model section sizes;
obtaining model section size sample performance data through the model section size design matrix;
performing response surface fitting on the model section size sample performance data and the model section size design matrix, and obtaining the vehicle body section optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the section optimization finite element model through the vehicle body section optimization finite element model.
Preferably, if the performance of the cross-section optimization finite element model does not meet the performance index of the vehicle body, the cross-section dimension optimization is carried out on the vehicle body parameterized finite element model again.
Preferably, the constraint condition of the structural topological optimization is a vehicle body performance target, and the aim is framework weight lightening.
Preferably, the parameter optimization of the finite element model of the vehicle body splitting part to obtain the parameter optimized finite element model of the vehicle body part and the performance of the parameter optimized finite element model of the vehicle body splitting part comprises the following steps:
obtaining a plurality of part finite element model parameter ranges through the vehicle body split part finite element model and the vehicle body foundation finite element model parameters;
obtaining a part finite element model parameter range design matrix according to a plurality of part finite element model parameter ranges and the initial recombination part model performance;
obtaining sample performance data of the finite element model parameter range of the part through the finite element model parameter range design matrix of the part;
performing response surface fitting on the performance data of the part finite element model parameter range sample and the part finite element model parameter range design matrix, and obtaining the vehicle body part parameter optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the part parameter optimized finite element model through the vehicle body part parameter optimized finite element model.
Preferably, if the performance of the part parameter optimization finite element model does not meet the performance index of the vehicle body, the re-parameter optimization is carried out on the finite element model of the vehicle body split part, and the engineering design is carried out again when the performance of the lightweight finite element model does not meet the performance index of the vehicle body.
Example two
FIG. 2 is a flow diagram illustrating a method for lightweight design of a vehicle body structure for use in a terminal, according to an exemplary embodiment, including the steps of:
obtaining a finite element model of the vehicle body foundation, and obtaining parameters of the finite element model of the vehicle body foundation through the finite element model of the vehicle body foundation, wherein the parameters of the finite element model of the vehicle body foundation comprise: the number of the vehicle body part structures, the materials and the material thickness. Based on a finite element model of a vehicle body foundation, parts in a local structure range are combined to form a target area for carrying out optimization design, and the local structure range is a plurality of parts which are in a certain range, feasible in production process and capable of being converted into one part. And combining a plurality of parts in the structural range into one part, and taking the maximum value of the material thickness of the plurality of parts as the initial material and the initial material thickness of the area combined part. The initial material is the material with the lowest part yield strength in the area, and the initial material thickness t is the upper limit value of the structural material thickness in the area.
The method is characterized in that finite element model parameters are integrated through a vehicle body region, namely after the initial material and the initial material thickness are determined, region fitting is carried out to determine the vehicle body parameterized finite element model, the size of the cross section of the vehicle body structure is set to be variable, the finite element model can be controlled to realize structural change by modifying the variable parameters, and the connection relation of the finite element model after the change is kept correct.
The specific implementation of the embodiment provided with the light-weight design of the D pillar area structure of a certain vehicle type according to the steps is as follows:
the method comprises the steps of obtaining a D column foundation finite element model, dividing D column structure areas, referring to a vehicle type D column area structure as shown in figure 3, wherein the D column cavity inner plate area structure is composed of an upper inner plate 1 and a lower inner plate 2 of a D column cavity, the upper inner plate is 1.4mm thick, the lower inner plate is 1.2mm thick, the D column cavity outer plate area structure is composed of an upper outer plate 3 and a lower outer plate 4 of the D column cavity, the upper outer plate is 0.9mm thick, and the lower inner plate is 0.8mm thick. Redefining the D-pillar area structure as shown in FIG. 4, reconstructing the parts in the inner plate area into one part, wherein the material thickness of the parts is 1.4mm, reconstructing the parts in the outer plate area into one part, and the material thickness of the parts is 0.9 mm. And establishing a vehicle body parameterized finite element model. And building a D-pillar parameterized finite element model according to the subdivided structure. The structural weight of the D pillar of the reference vehicle type is 12.2 kg.
according to the structural design of the parameterized finite element model of the vehicle body, the finite element analysis of the performance of the initial fitting model is carried out, the performance improvement is taken as a target to carry out the optimization of the section size, and the performance of the initial fitting model can be the performances of the vehicle body in the aspects of bending rigidity, torsional rigidity, collision, mode and the like.
The specific implementation mode of the embodiment designed by the lightweight D-pillar area structure of a certain vehicle type is as follows: and (4) carrying out finite element analysis on the rigidity value of the D column parameterized finite element model through Isight software.
and optimizing the section size of the vehicle body parameterized finite element model, wherein the optimization variables are the section size, the optimization constraint conditions are that the performance meets the target requirement, and the optimization target is that the structure weight is minimum.
Selecting a plurality of model section sizes for the vehicle body parameterization finite element model through initial fitting model performance by adopting Isight software, obtaining a model section size design matrix through the plurality of model section sizes, obtaining model section size sample performance data through finite element analysis of the model section size design matrix as response variables, carrying out response surface fitting on the model section size sample performance data and the model section size design matrix to build an approximate model, optimizing by adopting a simulated annealing algorithm, and designing the section size meeting performance requirements so as to obtain a vehicle body section optimization finite element model.
The specific implementation manner of the embodiment of the lightweight design of the D pillar region of a certain vehicle model in step 201 is as follows:
the section dimension variables are defined through Isight software, as shown in figure 5, 4 sections are taken from top to bottom in a D-column cavity, due to the influence of modeling and back door design arrangement, the front end positions 1-8 of the sections are taken as variable positions, as shown in figure 6, the X-direction coordinates and the Y-direction coordinates of each position are variable, 16 section dimension variables (left and right D columns are symmetrical, interface variables are changed synchronously) are designed in total, a design matrix can be generated through the Isight software, and the generated samples are subjected to torsion rigidity and weight finite element analysis. And performing response surface fitting through the section size variable and the torsional rigidity value, optimizing the structure by adopting a simulated annealing algorithm, and taking the standard torsional rigidity as a constraint condition and the minimum structural weight as an optimization target to obtain the D-pillar section optimization finite element model.
obtaining the performance of the section optimization finite element model by carrying out finite element analysis on the vehicle body section optimization finite element model, and judging whether the performance of the section optimization finite element model meets the vehicle body performance index:
and if the performance of the cross section optimization finite element model does not meet the performance index of the vehicle body, carrying out cross section size optimization on the vehicle body parameterization finite element model again.
And if the performance of the section optimization finite element model meets the performance index of the vehicle body, executing the next step.
and performing topological optimization on the area structure with the optimized section, wherein the optimized constraint condition is the performance target of the vehicle body, and the optimized target is that the weight of the framework is minimum, so that a topological optimization result is obtained. And determining the material distribution condition of the stressed structure in the divided regions according to the topological optimization result.
The specific implementation manner of the embodiment of the lightweight design of the D-pillar region structure of a certain vehicle model in step 201 is as follows:
the topological optimization space is the inner and outer plate areas of the D-pillar cavity shown in FIG. 3. The method takes the standard torsional rigidity as a constraint condition and the minimum structural weight as an optimization target. The part of the topology structure with large stress is reserved with more materials, and the part with small stress is reserved with less materials. The topology optimization results are shown in fig. 7.
and carrying out part splitting according to the topological optimization result and the finite element model for optimizing the section of the vehicle body, wherein the part splitting is to carry out part splitting design according to the material retaining position after the topological optimization, define part boundaries in the parameterized finite element model and realize the part splitting design so as to obtain a plurality of finite element models for splitting the vehicle body parts, and analyzing the initial recombined part model performance of the finite element models for splitting the vehicle body parts in a finite element manner.
The specific implementation manner of the embodiment of the lightweight design of the D-pillar region structure of a certain vehicle model in step 201 is as follows:
and designing the area with much reserved material into a part according to the topological optimization result. As shown in fig. 7, the D-pillar inner panel region structure is split into 3 parts, and the outer panel region is split into 2 parts.
and carrying out parameter optimization on the finite element model of the vehicle body split part, wherein the parameter optimization is to carry out size and material thickness optimization design on the split part, the position of a part overlapping area and the material thickness of the part are used as optimization variables to carry out structure optimization, the optimized constraint condition is a vehicle body performance target, and the optimized target is that the framework weight is minimum.
The method comprises the steps of obtaining a plurality of part finite element model parameter ranges through a vehicle body disassembly part finite element model and vehicle body foundation finite element model parameters, determining a part finite element model parameter range design matrix through the plurality of part finite element model parameter ranges and the initial recombination part model performance, obtaining part finite element model parameter range sample performance data through part finite element model parameter range design matrix finite element analysis and using the part finite element model parameter range sample performance data as response variables, carrying out response surface fitting on the part finite element model parameter range sample performance data and the part finite element model parameter range design matrix to build an approximate model, optimizing by adopting a simulated annealing algorithm, designing the section size meeting performance requirements, and obtaining a vehicle body part parameter optimization finite element model.
The specific implementation manner of the embodiment of the lightweight design of the D pillar region of a certain vehicle model in step 201 is as follows:
the initial material thickness of the part is taken as a value according to the material thickness of the area, the Z-direction positions of lap areas 1, 2 and 3 of the part in a coordinate system of the whole vehicle are set as variables, the material thickness of a split part is set as a variable, the material thickness optimization range of the part on an inner plate is (1.4,1.5 and 1.6), the material thickness optimization range of the part in the inner plate is (0.7,0.9,1.0 and 1.2), the material thickness optimization range of the part under the inner plate is (1.2,1.4 and 1.5), the material thickness optimization range of the part on the outer plate is (0.7,0.8 and 0.9), and the material thickness optimization range of the part under the outer plate is (0.7,0.8 and 0.9). The design matrix can be generated by Isight software, and the generated sample is subjected to torsional rigidity and weight finite element analysis. And performing response surface fitting through the section size variable and the torsional rigidity value, performing structure optimization by adopting a simulated annealing algorithm, and taking the standard torsional rigidity as a constraint condition and the minimum structural weight as an optimization target. Optimizing and determining the size range and the material thickness of the D column split part. After optimization, the thickness of the parts on the inner plate is 1.4mm, the thickness of the parts in the inner plate is 0.9mm, the thickness of the parts under the inner plate is 1.2mm, the thickness of the parts on the outer plate is 0.9mm, and the thickness of the parts under the outer plate is 0.7 mm. The Z direction of the lap joint area 1 is improved by 13mm compared with the initial splitting scheme, the Z direction of the lap joint area 2 is reduced by 6mm downwards compared with the initial splitting scheme, and the Z direction of the lap joint area 3 is reduced by 8mm compared with the initial splitting scheme.
208, judging whether the performance of the part parameter optimization finite element model meets the performance index of the vehicle body, and specifically comprising the following steps:
and (3) carrying out finite element analysis on the vehicle body part parameter optimization finite element model to obtain the performance of the part parameter optimization finite element model, and judging whether the performance of the part parameter optimization finite element model meets the vehicle body performance index:
if the performance of the part parameter optimization finite element model does not meet the performance index of the vehicle body, carrying out parameter re-optimization on the vehicle body split part finite element model;
if the performance of the part parameter optimization finite element model meets the performance index of the vehicle body, executing the next step;
step 209, performing engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the vehicle body lightweight finite element model, and judging whether the performance of the lightweight finite element model meets the vehicle body performance index, wherein the specific steps are as follows:
and carrying out engineering design on the obtained parameter optimization finite element model of the vehicle body part to obtain a light-weight finite element model of the vehicle body. Carrying out finite element analysis on the vehicle body lightweight finite element model to obtain lightweight finite element model performance, and judging whether the lightweight finite element model performance meets the vehicle body performance index:
if the performance of the lightweight finite element model meets the performance index of the vehicle body, the design is finished;
and if the performance of the lightweight finite element model does not meet the performance index of the vehicle body, carrying out engineering design again.
The specific implementation manner of the embodiment of the lightweight design of the D pillar region of a certain vehicle model in step 201 is as follows:
the performance is verified to meet the requirements through engineering design. Finally, the weight of the D column structure is 10.8kg, the weight reduction is 1.4kg, the weight reduction ratio reaches 11%, and the light weight design effect is obvious.
According to the method, a parametric finite element model of the vehicle body is built based on the regional structure definition, the sectional dimension of the parametric finite element model is optimized, then the regional structure topology optimization is carried out, the regional structure part splitting design is carried out according to the topology optimization, the part dimension and the material thickness are optimized, so that a lightweight design structure meeting the performance requirements is obtained, the rationality of the vehicle body framework is ensured, the product performance is improved, the vehicle body weight is reduced, and the structural lightweight design potential is further excavated.
EXAMPLE III
In an exemplary embodiment, there is also provided a vehicle body structure lightweight design system, as shown in fig. 8, including:
the region fitting module 310 is used for acquiring a finite element model of a vehicle body foundation, performing region fitting on the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and acquiring the initial fitting model performance of the parameterized finite element model;
the section optimization module 320 is used for optimizing the section size of the vehicle body parameterized finite element model to obtain a vehicle body section optimized finite element model, acquiring the performance of the section optimized finite element model, and judging whether the performance of the section optimized finite element model meets the vehicle body performance index;
the topology splitting module 330 is configured to perform structural topology optimization on the vehicle body section optimization finite element model to obtain a topology optimization result, and obtain a plurality of vehicle body splitting part finite element models through the topology optimization result and the vehicle body section optimization finite element model;
the parameter optimization module 340 is configured to perform parameter optimization on the finite element model of the vehicle body split part to obtain a vehicle body part parameter optimized finite element model, obtain performance of the component parameter optimized finite element model, and determine whether the performance of the component parameter optimized finite element model meets vehicle body performance indexes;
and the engineering design module 350 is used for performing engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
According to the method, a parametric finite element model of the vehicle body is built based on the regional structure definition, the sectional dimension of the parametric finite element model is optimized, then the regional structure topology optimization is carried out, the regional structure part splitting design is carried out according to the topology optimization, the part dimension and the material thickness are optimized, so that a lightweight design structure meeting the performance requirements is obtained, the rationality of the vehicle body framework is ensured, the product performance is improved, the vehicle body weight is reduced, and the structural lightweight design potential is further excavated.
Example four
Fig. 9 is a block diagram of a terminal according to an embodiment of the present application, where the terminal may be the terminal in the foregoing embodiment. The terminal 400 may be a portable mobile terminal such as: smart phones, tablet computers. The terminal 400 may also be referred to by other names such as user equipment, portable terminal, etc.
Generally, the terminal 400 includes: a processor 401 and a memory 402.
In some embodiments, the terminal 400 may further optionally include: a peripheral interface 403 and at least one peripheral. Specifically, the peripheral device includes: at least one of radio frequency circuitry 404, touch screen display 405, camera 406, audio circuitry 407, positioning components 408, and power source 409.
The peripheral interface 403 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 401 and the memory 402. In some embodiments, processor 401, memory 402, and peripheral interface 403 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 401, the memory 402 and the peripheral interface 403 may be implemented on a separate chip or circuit board, which is not limited by this embodiment.
The Radio Frequency circuit 404 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 404 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 404 converts an electrical signal into an electromagnetic signal for transmission, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 404 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 404 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: the world wide web, metropolitan area networks, intranets, generations of mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the rf circuit 404 may further include NFC (Near Field Communication) related circuits, which are not limited in this application.
The touch display screen 405 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. The touch display screen 405 also has the ability to capture touch signals on or over the surface of the touch display screen 405. The touch signal may be input to the processor 401 as a control signal for processing. The touch screen display 405 is used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the touch display screen 405 may be one, providing the front panel of the terminal 400; in other embodiments, the touch screen display 405 may be at least two, respectively disposed on different surfaces of the terminal 400 or in a folded design; in still other embodiments, the touch display 405 may be a flexible display disposed on a curved surface or on a folded surface of the terminal 400. Even more, the touch screen display 405 can be arranged in a non-rectangular irregular pattern, i.e., a shaped screen. The touch screen 405 may be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), and other materials.
The camera assembly 406 is used to capture images or video. Optionally, camera assembly 406 includes a front camera and a rear camera. Generally, a front camera is used for realizing video call or self-shooting, and a rear camera is used for realizing shooting of pictures or videos. In some embodiments, the number of the rear cameras is at least two, and each of the rear cameras is any one of a main camera, a depth-of-field camera and a wide-angle camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, and the main camera and the wide-angle camera are fused to realize a panoramic shooting function and a VR (Virtual Reality) shooting function. In some embodiments, camera assembly 406 may also include a flash. The flash lamp can be a single-color temperature flash lamp or a double-color temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.
The audio circuit 407 is used to provide an audio interface between the user and the terminal 400. The audio circuit 407 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals into the processor 401 for processing, or inputting the electric signals into the radio frequency circuit 404 to realize voice communication. The microphones may be provided in plural numbers, respectively, at different portions of the terminal 400 for the purpose of stereo sound collection or noise reduction. The microphone may also be an array microphone or an omni-directional pick-up microphone. The speaker is used to convert electrical signals from the processor 401 or the radio frequency circuit 404 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, audio circuitry 407 may also include a headphone jack.
The positioning component 408 is used to locate the current geographic position of the terminal 400 for navigation or LBS (Location Based Service). The Positioning component 408 can be a Positioning component based on the Global Positioning System (GPS) in the united states, the beidou System in china, or the galileo System in russia.
The power supply 409 is used to supply power to the various components in the terminal 400. The power source 409 may be alternating current, direct current, disposable or rechargeable. When the power source 409 includes a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.
In some embodiments, the terminal 400 also includes one or more sensors 410. The one or more sensors 410 include, but are not limited to: acceleration sensor 411, gyro sensor 412, pressure sensor 413, fingerprint sensor 414, optical sensor 415, and proximity sensor 416.
The acceleration sensor 411 may detect the magnitude of acceleration in three coordinate axes of the coordinate system established with the terminal 400. For example, the acceleration sensor 411 may be used to detect components of the gravitational acceleration in three coordinate axes. The processor 401 may control the touch display screen 405 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 411. The acceleration sensor 411 may also be used for acquisition of motion data of a game or a user.
The gyro sensor 412 may detect a body direction and a rotation angle of the terminal 400, and the gyro sensor 412 may cooperate with the acceleration sensor 411 to acquire a 3D (3 dimensional) motion of the user with respect to the terminal 400. From the data collected by the gyro sensor 412, the processor 401 may implement the following functions: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization at the time of photographing, game control, and inertial navigation.
The pressure sensor 413 may be disposed on a side bezel of the terminal 400 and/or a lower layer of the touch display screen 405. When the pressure sensor 413 is disposed at a side frame of the terminal 400, a user's grip signal to the terminal 400 can be detected, and left-right hand recognition or shortcut operation can be performed according to the grip signal. When the pressure sensor 413 is disposed at the lower layer of the touch display screen 405, the operability control on the UI interface can be controlled according to the pressure operation of the user on the touch display screen 405. The operability control comprises at least one of a button control, a scroll bar control, an icon control, and a menu control.
The fingerprint sensor 414 is used for collecting a fingerprint of the user to identify the identity of the user according to the collected fingerprint. Upon recognizing that the user's identity is a trusted identity, processor 401 authorizes the user to perform relevant sensitive operations including unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings, etc. The fingerprint sensor 414 may be disposed on the front, back, or side of the terminal 400. When a physical button or vendor Logo is provided on the terminal 400, the fingerprint sensor 414 may be integrated with the physical button or vendor Logo.
The optical sensor 415 is used to collect the ambient light intensity. In one embodiment, the processor 401 may control the display brightness of the touch screen display 405 according to the ambient light intensity collected by the optical sensor 415. Specifically, when the ambient light intensity is high, the display brightness of the touch display screen 405 is increased; when the ambient light intensity is low, the display brightness of the touch display screen 405 is turned down. In another embodiment, the processor 401 may also dynamically adjust the shooting parameters of the camera assembly 406 according to the ambient light intensity collected by the optical sensor 415.
A proximity sensor 416, also known as a distance sensor, is typically disposed on the front side of the terminal 400. The proximity sensor 416 is used to collect the distance between the user and the front surface of the terminal 400. In one embodiment, when the proximity sensor 416 detects that the distance between the user and the front surface of the terminal 400 gradually decreases, the processor 401 controls the touch display screen 405 to switch from the bright screen state to the dark screen state; when the proximity sensor 416 detects that the distance between the user and the front surface of the terminal 400 gradually becomes larger, the processor 401 controls the touch display screen 405 to switch from the breath screen state to the bright screen state.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is not intended to be limiting of terminal 400 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.
EXAMPLE five
In exemplary embodiments, there is also provided a computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing a vehicle body structure lightweight design method as provided by all inventive embodiments of the present application.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
EXAMPLE six
In an exemplary embodiment, an application product is also provided, which includes one or more instructions executable by the processor 401 of the apparatus to perform the method for designing a vehicle body structure with reduced weight.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A method for designing a vehicle body structure with reduced weight, comprising:
acquiring a finite element model of a vehicle body foundation, performing region fitting through the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and acquiring the performance of an initial fitting model of the parameterized finite element model;
optimizing the section size of the parameterized finite element model of the vehicle body to obtain an optimized finite element model of the vehicle body section and the performance of the optimized finite element model of the vehicle body section, and judging whether the performance of the optimized finite element model of the vehicle body section meets the performance index of the vehicle body;
if so, carrying out structural topological optimization on the vehicle body section optimization finite element model to obtain a topological optimization result, and obtaining a plurality of vehicle body split part finite element models through the topological optimization result and the vehicle body section optimization finite element model to obtain the initial recombination part model performance;
performing parameter optimization on the finite element model of the vehicle body splitting part to obtain a vehicle body part parameter optimization finite element model, acquiring the performance of the part parameter optimization finite element model, and judging whether the performance of the part parameter optimization finite element model meets the vehicle body performance index;
if so, carrying out engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
2. The method for designing the vehicle body structure in the light weight mode according to claim 1, wherein the step of obtaining a vehicle body parametric finite element model through region fitting of the vehicle body basic finite element model and carrying out finite element analysis on initial fitting model performance of the vehicle body parametric finite element model comprises the following steps of:
obtaining the parameters of the finite element model of the vehicle body foundation through the finite element model of the vehicle body foundation, wherein the parameters of the finite element model of the vehicle body foundation comprise: the number, materials and material thickness of the vehicle body part structure and the vehicle body part structure;
performing region fitting through the vehicle body foundation finite element model parameters to determine vehicle body region integration finite element model parameters;
integrating the parameters of the finite element model through the vehicle body region to obtain a vehicle body parameterized finite element model;
and obtaining the performance of an initial fitting model through the vehicle body parameterized finite element model.
3. The vehicle body structure lightweight design method according to claim 1, wherein the step of optimizing the cross-sectional dimension of the vehicle body parametric finite element model to obtain a vehicle body cross-sectional optimized finite element model and obtaining the performance of the cross-sectional optimized finite element model comprises the steps of:
obtaining a plurality of model section sizes through the performance of the vehicle body parameterized finite element model and the initial fitting model;
obtaining a model section size design matrix through a plurality of model section sizes;
obtaining model section size sample performance data through the model section size design matrix;
performing response surface fitting on the model section size sample performance data and the model section size design matrix, and obtaining the vehicle body section optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the section optimization finite element model through the vehicle body section optimization finite element model.
4. The method for designing the vehicle body structure in a light weight manner according to claim 3, wherein if the performance of the cross-section optimization finite element model does not meet the performance index of the vehicle body, the cross-section dimension optimization is carried out again on the vehicle body parametric finite element model.
5. The method of claim 1, wherein the constraint of topological optimization of the structure is a vehicle body performance goal, and the goal is a reduction in weight of the framework.
6. The method for designing the vehicle body structure in the light weight mode according to claim 1, wherein the step of performing parameter optimization on the finite element model of the vehicle body split part to obtain the finite element model of the vehicle body part parameter optimization and obtain the performance of the finite element model of the vehicle body part parameter optimization comprises the following steps:
obtaining a plurality of part finite element model parameter ranges through the vehicle body split part finite element model and the vehicle body foundation finite element model parameters;
obtaining a part finite element model parameter range design matrix according to a plurality of part finite element model parameter ranges and the initial recombination part model performance;
obtaining sample performance data of the finite element model parameter range of the part through the finite element model parameter range design matrix of the part;
performing response surface fitting on the part finite element model parameter range sample performance data and the part finite element model parameter range design matrix, and obtaining the vehicle body part parameter optimization finite element model by adopting a simulated annealing algorithm;
and obtaining the performance of the part parameter optimized finite element model through the vehicle body part parameter optimized finite element model.
7. The method for designing the vehicle body structure in the light weight mode according to claim 6, wherein if the performance of the part parameter optimization finite element model does not meet vehicle body performance indexes, the vehicle body split part finite element model is subjected to parameter re-optimization, and the performance of the light weight finite element model does not meet the vehicle body performance indexes and engineering design is carried out again.
8. A vehicle body structure lightweight design system characterized by comprising:
the region fitting module is used for obtaining a finite element model of a vehicle body foundation, performing region fitting through the finite element model of the vehicle body foundation to obtain a parameterized finite element model of the vehicle body and obtaining the initial fitting model performance of the parameterized finite element model;
the section optimization module is used for optimizing the section size of the vehicle body parameterized finite element model to obtain a vehicle body section optimized finite element model and obtain the performance of the section optimized finite element model, and judging whether the performance of the section optimized finite element model meets the performance index of the vehicle body;
the topology splitting module is used for carrying out structural topology optimization on the vehicle body section optimization finite element model to obtain a topology optimization result, and obtaining a plurality of vehicle body splitting part finite element models through the topology optimization result and the vehicle body section optimization finite element model;
the parameter optimization module is used for carrying out parameter optimization on the finite element model of the vehicle body split part to obtain a vehicle body part parameter optimization finite element model, obtaining the performance of the part parameter optimization finite element model, and judging whether the performance of the part parameter optimization finite element model meets the vehicle body performance index;
and the engineering design module is used for carrying out engineering design on the vehicle body part parameter optimization finite element model to obtain a vehicle body lightweight finite element model and obtain the performance of the lightweight finite element model, judging whether the performance of the lightweight finite element model meets the vehicle body performance index, and if so, finishing the design.
9. A terminal, comprising:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
a vehicle body structure lightweight design method according to any one of claims 1 to 7 is performed.
10. A non-transitory finite element analysis machine-readable storage medium, wherein instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform the method of vehicle body structure lightweight design of any of claims 1 to 7.
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