Concept stage automobile body forward design method, device and system

Abstract

The present invention discloses a forward design method, device and system for automobile bodies in the concept stage, the method comprising: building a body-in-white solid grid skeleton model; optimizing the body-in-white solid grid skeleton model; interpreting the optimized body-in-white solid grid skeleton model and converting it into a body-in-white skeleton geometric model; determining the key cross-sections, joint hard points, crossbeams and reinforcement positions of the body-in-white; establishing a competitive vehicle database; assembling a hybrid model; analyzing the sensitivity of the hybrid model, and optimizing the cross-sections and joints of the upper body; optimizing the structure of the three-dimensional conceptual data of the lower body; assembling a body-in-white conceptual three-dimensional data model; and verifying whether the performance of each subject of the body-in-white conceptual three-dimensional data model meets the requirements. The implementation of the present invention can reduce the R&D cycle of an enterprise, grasp the body performance in real time during the concept design stage, and reduce unnecessary repetitive labor.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile body design, and in particular to a method, device and system for forward design of an automobile body at a concept stage. Background Art

[0002] The body concept design is an important stage of body design, and the construction of the body frame in the concept design stage is very important. If there are design defects and blind spots in the early body frame, it will take a lot of manpower, time and cost to make up for it in the later detailed design stage. Therefore, it is particularly important to consider the body frame design of NVH (noise, vibration and harshness), collision, structure and other performance in the concept design stage.

[0003] At present, the white body design in the conceptual design stage is divided into the following stages: body concept data design - CAE modeling analysis of various disciplines - body structure optimization. In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the concept data design is designed by design engineers based on their experience and the data of the previous generation of models or competing vehicles, and lacks a scientific basis. The quality of data design places very high demands on body design engineers. The second stage of CAE modeling analysis of various disciplines also requires a lot of time and manpower. The white body model is relatively complex, and the CAE calculation cost brought about by each design change is also very large.

[0004] Therefore, it is very important to shorten the R&D cycle of enterprises, grasp the vehicle body performance in real time during the conceptual design stage, reduce unnecessary repetitive labor, and innovate scientific conceptual vehicle body forward design methods. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method, device and system for forward design of an automobile body at a conceptual stage that overcomes the above problems or at least partially solves the above problems.

[0006] According to one aspect of the present invention, a concept-stage automobile body forward design method is provided, which comprises:

[0007] Build a body-in-white solid grid skeleton model based on the basic parameters of the concept design body and the CAS data of the previous platform model and body;

[0008] According to the collision and stiffness requirements of the concept car, the body-in-white solid grid skeleton model is optimized to obtain the best force transmission path of the body-in-white;

[0009] Interpret the optimized body-in-white solid mesh skeleton model and convert the optimized body-in-white solid mesh skeleton model into a body-in-white skeleton geometric model;

[0010] Determine the key sections, joint hard points, beams, and reinforcement locations of the body in white according to actual engineering requirements;

[0011] Determine competing vehicles based on vehicle market price positioning and basic parameter information; and establish a competing vehicle database based on existing vehicle model information;

[0012] Based on the competitive vehicle database and the determined key sections and joint hard point locations, a hybrid model of the upper body section joint simple model and the lower body 3D conceptual data is constructed;

[0013] Performing section sensitivity analysis and joint sensitivity analysis on the hybrid model respectively, obtaining the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, and retrieving the section and joint parameters of the corresponding numbers from the competitive vehicle database and bringing them into the hybrid model, and performing structural optimization on the sections and joints of the upper body, or performing structural optimization based on the existing sections and joints;

[0014] Structural optimization is performed on the three-dimensional conceptual data of the lower vehicle body of the hybrid model to obtain a three-dimensional data model of the lower vehicle body;

[0015] Based on the optimized body sections, joints and frames of the body-in-white and the optimized 3D conceptual data of the lower body, a 3D data model of the body-in-white concept is constructed;

[0016] Verify whether the performance of each subject of the white body concept 3D data model meets the requirements.

[0017] According to another aspect of the present invention, there is provided a concept-stage automobile body forward design device, comprising:

[0018] The grid model building module is suitable for building a body-in-white solid grid skeleton model based on the basic parameters of the concept design body and the CAS data of the previous platform model and body;

[0019] The mesh model optimization module is suitable for optimizing the body-in-white solid mesh skeleton model according to the collision and stiffness requirements of the concept car to obtain the best force transmission path of the body-in-white;

[0020] A geometric model conversion module, which is suitable for interpreting the optimized body-in-white solid mesh skeleton model and converting the optimized body-in-white solid mesh skeleton model into a body-in-white skeleton geometric model;

[0021] The key information determination module is suitable for determining the key sections, joint hard points, crossbeams, and reinforcement positions of the body in white according to actual engineering requirements;

[0022] A competitive vehicle database establishment module is suitable for determining competitive vehicles according to vehicle model market price positioning and basic parameter information; and establishing a competitive vehicle database according to existing vehicle model information;

[0023] A hybrid model building module is suitable for building a hybrid model of the upper body section joint simple model and the lower body 3D conceptual data based on the competitive vehicle database and the determined key section and joint hard point positions;

[0024] A hybrid model analysis module, adapted to perform section sensitivity analysis and joint sensitivity analysis on the hybrid model, obtain the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, retrieve the section and joint parameters with the corresponding numbers from the competitive vehicle database and bring them into the hybrid model, perform structural optimization on the sections and joints of the upper vehicle body, or perform structural optimization based on the existing sections and joints;

[0025] A lower body structure optimization module, adapted to perform structural optimization on the three-dimensional conceptual data of the lower body of the hybrid model and obtain a three-dimensional data model of the lower body;

[0026] The 3D model assembly module is suitable for assembling a 3D data model of the body-in-white concept according to the optimized body section, joints and skeleton of the body-in-white and the optimized 3D conceptual data of the lower body;

[0027] The 3D model verification module is suitable for verifying whether the performance of each subject of the 3D data model of the body-in-white concept meets the requirements.

[0028] According to another aspect of the present invention, a concept-stage automobile body forward design system is provided, comprising: a processor and a memory, the memory being used to store at least one executable instruction, the executable instruction enabling the processor to execute operations corresponding to the above method.

[0029] According to another aspect of the present invention, a computer storage medium is provided, wherein the storage medium stores at least one executable instruction, and the executable instruction enables a processor to perform operations corresponding to the above method.

[0030] According to the concept stage automobile body forward design method, device and system of the present invention, a body-in-white solid grid skeleton model is built according to the basic parameters of the concept design body and the CAS data of the previous platform model and body; the body-in-white solid grid skeleton model is optimized according to the collision and stiffness requirements of the concept car to obtain the best force transmission path of the body-in-white; the optimized body-in-white solid grid skeleton model is interpreted and converted into a body-in-white skeleton geometric model; the key sections, joint hard points, crossbeams and reinforcement positions of the body-in-white are determined according to actual engineering requirements; competing vehicles are determined according to the market price positioning and basic parameter information of the vehicle model; and a competing vehicle database is established according to the existing vehicle model information; and the competitive vehicle database and the determined key sections and joint hard points are converted into a geometric model of the body-in-white skeleton. Point positions are determined, and a hybrid model of a simple model of the upper body section joint and the three-dimensional conceptual data of the lower body is constructed; section sensitivity analysis and joint sensitivity analysis are respectively performed on the hybrid model to obtain the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, and the section and joint parameters with the corresponding numbers are retrieved from the competitive vehicle database and brought into the hybrid model to perform structural optimization on the sections and joints of the upper body, or to perform structural optimization based on the existing sections and joints; structural optimization is performed on the three-dimensional conceptual data of the lower body of the hybrid model, and a three-dimensional data model of the lower body is obtained; a three-dimensional data model of the body-in-white concept is constructed based on the optimized body sections, joints and skeleton of the body-in-white and the optimized three-dimensional conceptual data of the lower body; and it is verified whether the performance of each subject of the three-dimensional data model of the body-in-white concept meets the requirements. To implement the embodiment of the present invention, only the cross-section, joint hard point position, vehicle body CAS, and envelope need to be provided. The cross-section and joint at the key position can be quickly found through sensitivity analysis. The optimization of the joints and cross-sections can quickly find the joints and cross-sections suitable for the vehicle model in the conceptual design. The model can be easily and quickly changed and replaced, which is suitable for the characteristics of conceptual design. The conceptual stage provides relatively little data. This model only needs cross-section information or replacement of joints, which reduces the company's R&D cycle, allows the vehicle body performance to be grasped in real time during the conceptual design stage, and reduces unnecessary repetitive labor.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1A flowchart of a method for forward designing a vehicle body at a conceptual stage according to a first embodiment of the present invention is shown;

[0034] Figure 2 A schematic diagram of functional modules of a device for forward designing an automobile body at a conceptual stage according to an embodiment of the present invention is shown;

[0035] Figure 3 It shows a schematic structural diagram of a concept stage automobile body forward design system according to an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of a body-in-white solid mesh model designed by a forward design method for an automobile body in the conceptual stage of the first embodiment of the present invention is shown;

[0037] Figure 5a and Figure 5b A schematic diagram of an optimized body-in-white solid grid skeleton model designed by a forward design method for an automobile body in the conceptual stage of the first embodiment of the present invention is shown;

[0038] Figure 6 It shows a schematic diagram of a body-in-white skeleton geometric model designed by a forward design method for an automobile body in the conceptual stage of the first embodiment of the present invention;

[0039] Figure 7 It shows a schematic diagram of a competitor car database designed by a forward design method for a car body in the conceptual stage according to a first embodiment of the present invention;

[0040] Figure 8 It shows a schematic diagram of a hybrid model designed by a forward design method of an automobile body in the conceptual stage according to a first embodiment of the present invention;

[0041] Fig. 9 It shows a schematic diagram of the ranking results of the torsional modal sensitivity of the joint body designed by the forward design method of the automobile body in the conceptual stage according to the first embodiment of the present invention;

[0042] Fig.10 A schematic diagram showing the sensitivity analysis results of the characteristic parameters of the cross section designed by the forward design method of the automobile body in the conceptual stage of the first embodiment of the present invention to the torsional stiffness is shown;

[0043] Fig.11 A schematic diagram of a conceptual three-dimensional data model of a body-in-white designed by a forward design method for an automobile body at a conceptual stage according to a first embodiment of the present invention is shown. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] Conceptual data design is designed by design engineers based on their experience and the data of previous generation models or competing vehicles, and lacks scientific basis. The quality of data design places very high demands on body design engineers. The second stage of CAE modeling and analysis of various disciplines also requires a lot of time and manpower. The body-in-white model is relatively complex, and the CAE calculation cost brought about by each design change is also very large. Using the solution of this embodiment, only the cross-section, joint hard point position, body CAS, and vehicle envelope need to be provided. Through sensitivity analysis, the cross-sections and joints at key positions can be quickly found. The optimization of joints and cross-sections can enable the conceptual design to quickly find joints and cross-sections suitable for this model. Model changes and replacements are convenient and fast, which is suitable for the characteristics of conceptual design. The conceptual stage provides relatively little data. This model only needs cross-section information or replacement of joints, which reduces the company's R&D cycle, grasps the body performance in real time during the conceptual design stage, and reduces unnecessary repetitive labor.

[0046] Reference Figure 1 As shown, Figure 1 A flow chart of a method for forward designing a car body at a conceptual stage according to a first embodiment of the present invention is shown. The method comprises the following steps:

[0047] Step S10: Build a body-in-white solid grid skeleton model based on the basic parameters of the conceptual design body and the CAS data of the previous platform model and body.

[0048] In this step, according to the basic parameters of the conceptual design body and the CAS (Concept A Surface) data of the previous platform model and body, a mathematical model is built through software, and corresponding constraints and target conditions are set to build a white body solid grid skeleton model, that is, a white body hexahedron or tetrahedron conceptual design model is obtained. Figure 4 The schematic diagram of the body-in-white solid grid skeleton model designed by the forward design method of the automobile body in the conceptual stage of the first embodiment of the present invention is shown. The body-in-white (Body in White) described in the present invention refers to the body before welding but before painting, and does not include moving parts such as four doors and two covers. The painted body-in-white plus interior and exterior decoration (including dashboard, seats, windshield, carpet, interior trim, etc.) and electronic and electrical systems (audio, wiring harness, switches, etc.), plus chassis system (including brake, suspension system, etc.), plus powertrain system (including engine, gearbox, etc.) constitute the whole vehicle.

[0049] Step S20: According to the collision and stiffness requirements of the concept car, the body-in-white solid grid skeleton model is optimized to obtain the best force transmission path of the body-in-white.

[0050] In this step, according to the collision and stiffness requirements of the concept car, that is, considering bending stiffness, torsional stiffness, front collision, offset collision, side collision, rear collision and other working conditions, the body-in-white solid mesh model is optimized to obtain the optimal force transmission path of the body-in-white. Figure 5a and Figure 5b A schematic diagram of an optimized body-in-white solid grid skeleton model designed by a forward design method for an automobile body at a conceptual stage according to a first embodiment of the present invention is shown.

[0051] Step S30: interpreting the optimized BIW solid mesh skeleton model, and performing smoothing processing on the optimized BIW solid mesh skeleton model to convert it into a BIW skeleton geometric model.

[0052] In this step, the optimized body-in-white solid mesh model is interpreted based on experience and the existing vehicle model database, and the optimized body-in-white solid mesh skeleton model is converted into a body-in-white skeleton geometric model. Figure 5a and Figure 5b It is the body-in-white skeleton model under various performance constraints, that is, the optimized body-in-white solid grid skeleton model (the body-in-white skeleton model is a model obtained by deleting unnecessary materials from the body-in-white solid grid skeleton model through topological optimization). In the embodiment of the present invention, the optimized body-in-white solid grid model is smoothed and converted into a body-in-white skeleton geometric model for reference by the design department. The body-in-white skeleton geometric model includes the total layout space of the transverse and longitudinal beams and various components, as well as the material distribution of the areas that need to be strengthened. Figure 6 A schematic diagram of a body-in-white skeleton geometric model designed by a forward design method for an automobile body at a conceptual stage according to a first embodiment of the present invention is shown.

[0053] Step S40: Determine the key cross-sections, joint hard points, cross beams, and reinforcement positions of the body in white according to actual engineering requirements.

[0054] In this step, according to the actual engineering situation, such as external CAS, general layout, functional parts, etc., determine the key sections, joint hard points, cross beams, and reinforcement positions of the vehicle body. Since the vehicle body structure is bilaterally symmetrical about the Y axis, it is sufficient to determine the positions of half of the key sections, joint hard points, cross beams, and reinforcement positions.

[0055] Step S50: Determine competing vehicles according to vehicle model market price positioning and basic parameter information; and establish a competing vehicle database according to existing vehicle model information.

[0056] In this step, based on the market price positioning, length, width, height and other basic parameter information of the vehicle model, the competing vehicles are determined, and a database of sections and joints of different levels of vehicle bodies is established, that is, a database of competing vehicles of corresponding levels of vehicles is established based on the existing vehicle model information. The competing vehicle database includes but is not limited to a database of vehicle model level, vehicle model, section and joint. Figure 7 The schematic diagram of the competitive vehicle database designed by the forward design method of the automobile body in the conceptual stage of the first embodiment of the present invention is shown. Among them, the fields in the competitive vehicle database include but are not limited to the vehicle model grade number, vehicle model number, and section / joint number. The first digit is the vehicle model grade number. The vehicle model grades A, B, C, and D correspond to the vehicle model grade numbers 1, 2, 3, and 4 respectively; the middle three digits are the vehicle model numbers of the corresponding grade vehicles, and the reserved number range is 001-999, such as the C-class vehicle model 2 is numbered 3002; the last two digits are the section / joint number, and the reserved numbers 01-79 are the section numbers, and 80-99 are the joint numbers. For example, the section number of the A-pillar of the C-class vehicle model 2 is 300201, and the joint number on the B-pillar of the D-class vehicle model 3 is 400381.

[0057] Table 1 Examples of specific section positions in the car body key section database

[0058] Serial number Section location and description 1 WINDSHIELD HEADER AT C / L 2 WINDSHIELD HEADER AT C / L OCCUPANT 3 WINDSHIELD LOWER AT C / L 4 WINDSHIELD LOWER AT RIGHT WIPER PIVOT 5 WINDSHIELD LOWER@HOOD HINGE 6 FRONT BUMPER AT C / L 7 REAR DOOR LOWER HINGE 8 REAR DOOR LATCH 9 REAR DOOR AT REAR ARCH CLADING 10 REAR BUMP AT BODYSIDE 11 ROOF HEADER AT FRONT DOOR 12 ROOF HEADER AT REAR DOOR 13 ROOF HEADER AT REAR FIX GLASS 14 A / PILLAR ABOVE BELT 15 TAIL GATE GAS STRUT MOUNTING(UPPER) 16 A / PILLAR AT UPPER HINGE 17 A / PILLAR AT LOWER HINGE 18 REAR DOOR UPPER HINGE 19 FRONT DOOR LATCH 20 BELT AT FRONT DOOR 21 B / PILLAR ABOVE BELT WITH WINDOW LH 22 REAR DOOR AT REAR QUARTER WINDOW 23 ROCKER AT FRONT DOOR 24 ROCKER AT SIDE REAR DOOR 25 REAR WHEEL OPENING AT C / L 26 REAR WHEEL OPENING 27 REAR WINDOW HEADER AT C / L 28 REAR WINDOW HEADER AT C / L HINGE 29 REAR WINDOW LOWER AT C / L 30 REAR BUMPER AT C / L 31 REAR BUMPER AT C / L 32 HATCHBACK

[0059] Step S60: Based on the competitor vehicle database and the determined key sections and joint hard point positions, a hybrid model of the upper vehicle body section joint simple model and the lower vehicle body three-dimensional conceptual data is constructed.

[0060] The steps specifically include the following steps: according to the key sections and joint hard points of step S50, a simple model of the upper body section joint is established. Since the joint force is relatively complex, the finite element model is used for the joint. Since the lower body data is determined first in the body concept design stage, there is no upper body data. According to the distribution results of the beams and reinforcements in the optimized body-in-white solid mesh model, combined with the actual ergonomics, a three-dimensional conceptual model of the lower body is built. The initial beam section shape and joint are first randomly selected from the competitive vehicle database. A hybrid model of the simple upper body section joint model and the three-dimensional conceptual data of the lower body are assembled according to the competitive vehicle database and the determined key sections and joint hard point positions. Figure 8 A schematic diagram of a hybrid model designed by a forward design method for an automobile body in the conceptual stage according to a first embodiment of the present invention is shown.

[0061] Step S70: Perform section sensitivity analysis and joint sensitivity analysis on the hybrid model respectively to obtain the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, retrieve the section and joint parameters with the corresponding numbers from the competitive vehicle database and bring them into the hybrid model to perform structural optimization on the sections and joints of the upper body, or perform structural optimization based on the existing sections and joints.

[0062] In this step, the sensitivity analysis is first performed on the constructed simple model of the cross-section joint. Under the conditions of bending and torsional stiffness, modal and other performance conditions, the sensitivity of the cross-section joint is calculated to obtain the joints and cross-section positions that have the highest impact on the corresponding performance, providing direction for the later body design. Taking the sensitivity of the joint body torsional modal as an example, the sensitivity of each joint is shown in Table 2:

[0063] Table 2 Example of joint body torsional modal sensitivity analysis

[0064] Connector No. Torsional modal sensitivity Rank 80 6.36E+00 1 86 3.37E+00 2 82 7.97E-01 3 87 2.39E-01 4 83 2.14E-01 5 85 2.07E-01 6 84 3.78E-02 7 81 -3.17E-02 8

[0065] Fig. 9 A schematic diagram of the ranking results of the torsional modal sensitivity of the joint body designed by the forward design method of the automobile body in the conceptual stage of the first embodiment of the present invention is shown. Fig. 9 In NX, N.1 represents the ranking X, and N.1 represents the ranking 1. For the top-ranked joints, we can further perform sensitivity analysis on the joint stiffness of X, Y, and Z. In this way, we can get the direction of the later joint design, and the stiffness of a certain direction of a certain joint needs to be paid special attention.

[0066] Taking the sensitivity analysis and optimization of the torsional stiffness of the car body section as an example, the sensitivity of the characteristic parameters of each section to the torsional stiffness is obtained. Fig.10 The following is a schematic diagram of the sensitivity analysis results of the characteristic parameters of the cross-section obtained by the forward design method of the automobile body in the conceptual stage of the first embodiment of the present invention to the torsional stiffness. The horizontal axis represents the corresponding cross-section number, and the vertical axis represents the sensitivity of the cross-section properties of the corresponding cross-section to the torsional stiffness. The height of the column bar represents the sensitivity, and the positive and negative values ​​indicate that the cross-section properties are positively or negatively correlated with the torsional stiffness. Fig.10 In the figure, DV_15 represents the section numbered 15, which is the A-pillar section in this example.

[0067] According to the sensitivity analysis results, the key cross-section position is found for the car body. For the key cross-section, the cross-section performance of the competitor car database can be further compared. For example, the comparison of the mechanical properties of the joint-related cross-section of the competitor car No. 15 is shown in Table 3:

[0068] Table 3 Comparison example of mechanical properties of joint sections of competitor model No. 15

[0069] Parameters\Model Model No. 1-15 Section Model No. 2-15 Section Model No. 3-15 Section Model No. 4-15 Section Outer plate thickness 0.7 0.7 0.7 0.7 Thickness of middle plate 1.5 1.5 1.5 1.4 Inner plate thickness 1.2 1.2 2.0 1.2 area 506.4591 524.3753 497.5055 469.3180 IY 3.8192e+005 3.9322e+005 2.7857e+005 3.4322e+005 IZ 2.0937e+005 2.3341e+005 1.6582e+005 2.0092e+005 Torsion constant 1.6619e+005 1.9370e+005 1.7764e+005 2.0313e+005

[0070] The embodiment of the present invention adopts a simple model of section joints, with a relatively small number of units, easy replacement of sections and joints, and a fast calculation speed. It can quickly help the design department understand the relationship between design and performance in the early stage, and the method is scientific.

[0071] Based on the competitive vehicle database information, the parameters of the simple model sections and joints are optimized.

[0072] After the optimization is completed, the optimal solution and suboptimal solution of the simple model combination based on the section and joint database can be obtained. Since there is no body data in the early conceptual design, the later design can directly refer to or borrow the optimized joints, and the optimized section can also be used as a reference for the later design.

[0073] Step S80: Structural optimization is performed on the three-dimensional conceptual data of the lower vehicle body of the hybrid model to obtain a three-dimensional data model of the lower vehicle body.

[0074] In this step, the lower body structure of the hybrid model is optimized, such as the structure of the torsion box, the door sill beam, the longitudinal beam, etc., as well as the arrangement of the floor wheel cover reinforcement ribs, and the optimized lower body three-dimensional digital model is obtained.

[0075] Step S90: constructing a BIW conceptual 3D data model based on the optimized BIW upper body sections, joints and skeleton and the optimized lower body 3D conceptual data.

[0076] In this step, based on the total layout space of each section number position, the section joints obtained from the previous optimization design, and the body-in-white skeleton model, the initial version of the upper body 3D digital model is obtained from point to line and then to surface. Combined with the optimized lower body 3D conceptual data, the body-in-white conceptual 3D data model is assembled. Fig.11 A schematic diagram of a conceptual three-dimensional data model of a body-in-white designed by a forward design method for an automobile body at a conceptual stage according to a first embodiment of the present invention is shown.

[0077] Step S100: Verify whether the performance of each subject of the BIW conceptual 3D data model meets the requirements.

[0078] In this step, the BIW conceptual 3D data model is processed by CAE to verify whether the performance of each subject meets the requirements.

[0079] The concept-stage automobile body forward design method provided by the embodiment of the present invention can be applied to the concept-stage body design of vehicles such as SUVs, sedans and MPVs.

[0080] Figure 2The functional block diagram of a vehicle body forward design device in the concept stage according to an embodiment of the present invention is shown. The vehicle body forward design device 200 in the concept stage includes but is not limited to: a grid model building module 10, a grid model optimization module 20, a geometric model conversion module 30, a key information determination module 40, a competitor vehicle database establishment module 50, a hybrid model assembly module 60, a hybrid model analysis and optimization module 70, a lower vehicle body structure optimization module 80, a three-dimensional model assembly module 90, and a three-dimensional model verification module 100.

[0081] A mesh model building module 10 is adapted to build a body-in-white solid mesh skeleton model according to basic parameters of a conceptually designed body and CAS data of a previous platform model and body;

[0082] A mesh model optimization module 20 is adapted to optimize the body-in-white solid mesh skeleton model according to the collision and stiffness requirements of the concept car to obtain an optimal force transmission path of the body-in-white;

[0083] A geometric model conversion module 30, adapted to interpret the optimized body-in-white solid mesh skeleton model and convert the optimized body-in-white solid mesh skeleton model into a body-in-white skeleton geometric model;

[0084] The key information determination module 40 is adapted to determine the key cross-sections, joint hard points, cross beams, and reinforcement positions of the body in white according to actual engineering requirements;

[0085] The competing vehicle database establishment module 50 is adapted to determine competing vehicles according to the market price positioning and basic parameter information of vehicle models; and to establish a competing vehicle database according to the existing vehicle model information;

[0086] A hybrid model building module 60 is adapted to build a hybrid model of a simplified model of an upper body section joint and three-dimensional conceptual data of a lower body according to a competitive vehicle database and determined key sections and joint hard point positions;

[0087] The hybrid model analysis and optimization module 70 is adapted to perform section sensitivity analysis and joint sensitivity analysis on the hybrid model, obtain the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, retrieve the section and joint parameters with the corresponding numbers from the competitive vehicle database and bring them into the hybrid model, perform structural optimization on the sections and joints of the upper vehicle body, or perform structural optimization based on the existing sections and joints;

[0088] A lower body structure optimization module 80 is adapted to perform structural optimization on the three-dimensional conceptual data of the lower body of the hybrid model and obtain a three-dimensional data model of the lower body;

[0089] A three-dimensional model building module 90 is adapted to build a three-dimensional data model of the body-in-white concept according to the optimized body sections, joints and skeleton on the body-in-white and the optimized three-dimensional conceptual data of the lower body;

[0090] The three-dimensional model verification module 100 is suitable for verifying whether the performance of each subject of the three-dimensional data model of the body-in-white concept meets the requirements.

[0091] For the specific structure and working principle of each of the above modules, please refer to the description of the corresponding steps in the method embodiment, which will not be repeated here.

[0092] An embodiment of the present application provides a non-volatile computer storage medium, wherein the computer storage medium stores at least one executable instruction, and the computer executable instruction can execute the concept stage automobile body forward design method in any of the above method embodiments.

[0093] Figure 3 A schematic structural diagram of a concept-stage automobile body forward design system according to an embodiment of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the system.

[0094] The system may include: a processor 302 , a communications interface 304 , a memory 306 , and a communications bus 308 .

[0095] in:

[0096] The processor 302 , the communication interface 304 , and the memory 306 communicate with each other via the communication bus 308 .

[0097] The communication interface 304 is used to communicate with other devices such as clients or other servers.

[0098] The processor 302 is used to execute the program 310, and specifically can execute the relevant steps in the embodiment of the automobile body forward design method in the concept stage.

[0099] Specifically, the program 310 may include program codes, which include computer operation instructions.

[0100] The processor 302 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the system may be processors of the same type, such as one or more CPUs, or processors of different types, such as one or more CPUs and one or more ASICs.

[0101] The memory 306 is used to store the program 310. The memory 306 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0102] The program 310 may be specifically configured to enable the processor 302 to perform the following operations:

[0103] Build a body-in-white solid grid skeleton model based on the basic parameters of the concept design body and the CAS data of the previous platform model and body;

[0104] According to the collision and stiffness requirements of the concept car, the body-in-white solid grid skeleton model is optimized to obtain the best force transmission path of the body-in-white;

[0105] Interpret the optimized body-in-white solid mesh skeleton model and convert the optimized body-in-white solid mesh skeleton model into a body-in-white skeleton geometric model;

[0106] Determine the key sections, joint hard points, beams, and reinforcement locations of the body in white according to actual engineering requirements;

[0107] Determine competing vehicles based on vehicle market price positioning and basic parameter information; and establish a competing vehicle database based on existing vehicle model information;

[0108] Based on the competitive vehicle database and the determined key sections and joint hard point locations, a hybrid model of the upper body section joint simple model and the lower body 3D conceptual data is constructed;

[0109] Performing section sensitivity analysis and joint sensitivity analysis on the hybrid model respectively, obtaining the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, and retrieving the section and joint parameters of the corresponding numbers from the competitive vehicle database and bringing them into the hybrid model, and performing structural optimization on the sections and joints of the upper body, or performing structural optimization based on the existing sections and joints;

[0110] Structural optimization is performed on the three-dimensional conceptual data of the lower vehicle body of the hybrid model to obtain a three-dimensional data model of the lower vehicle body;

[0111] Based on the optimized body sections, joints and frames of the body-in-white and the optimized 3D conceptual data of the lower body, a 3D data model of the body-in-white concept is constructed;

[0112] Verify whether the performance of each subject of the white body concept 3D data model meets the requirements.

[0113] In an optional manner, the collision includes frontal collision, offset collision, side collision and rear collision, and the stiffness includes bending stiffness and torsional stiffness.

[0114] In an optional manner, the geometric model of the body-in-white skeleton includes transverse and longitudinal beams, the overall layout space of various components, and the material distribution of areas that need to be strengthened.

[0115] In an optional manner, the competitor vehicle database includes but is not limited to a vehicle model level, vehicle model, section and joint database.

[0116] In an optional manner, the steps of constructing a hybrid model of the upper body section joint simple model and the lower body three-dimensional conceptual data according to the competitive vehicle database and the determined key section and joint hard point positions specifically include:

[0117] A simple model of the upper body section joint is established based on the key sections and joint hard points; a three-dimensional conceptual model of the lower body is built based on the distribution results of the beams and reinforcements in the optimized white body solid grid skeleton model and the actual ergonomics situation; a vehicle model combination is randomly selected from the competitive vehicle database; and a hybrid model of the simple model of the upper body section joint and the three-dimensional conceptual data of the lower body is assembled.

[0118] According to the concept stage automobile body forward design method, device and system of the present invention, a body-in-white solid grid skeleton model is constructed according to the basic parameters of the concept design body and the CAS data of the previous platform model and body; the body-in-white solid grid skeleton model is optimized according to the collision and stiffness requirements of the concept car to obtain the best force transmission path of the body-in-white; the optimized body-in-white solid grid skeleton model is interpreted and converted into a body-in-white skeleton geometric model; the key sections, joint hard points, crossbeams and reinforcement positions of the body-in-white are determined according to actual engineering requirements; competing vehicles are determined according to the market price positioning and basic parameter information of the vehicle model; and a competing vehicle database is established according to the existing vehicle model information; based on the competing vehicle database and the determined key sections and joint hard points, the optimized body-in-white solid grid skeleton model is converted into a body-in-white skeleton geometric model; based on the competitive vehicle database and the determined key sections and joint hard points, the optimized body-in-white solid grid skeleton model is converted into a body-in-white skeleton geometric model; based on the actual engineering requirements, the optimized body-in-white solid grid skeleton model is converted into a body-in-white skeleton geometric model; and based on the competitive vehicle database and the determined key sections and joint hard points ... Position, assemble a hybrid model of the simple model of the upper body section joint and the three-dimensional conceptual data of the lower body; perform section sensitivity analysis and joint sensitivity analysis on the hybrid model respectively, obtain the section and joint numbers with the highest sensitivity ranking under the corresponding working conditions, and retrieve the section and joint parameters with the corresponding numbers from the competitive vehicle database and bring them into the hybrid model, perform structural optimization on the sections and joints of the upper body, or perform structural optimization based on the existing sections and joints; perform structural optimization on the three-dimensional conceptual data of the lower body of the hybrid model, and obtain a three-dimensional data model of the lower body; assemble a three-dimensional data model of the body-in-white concept according to the optimized body sections, joints and skeleton on the body-in-white and the optimized three-dimensional conceptual data of the lower body; verify whether the performance of each subject of the three-dimensional data model of the body-in-white concept meets the requirements. To implement the embodiment of the present invention, it is only necessary to provide the cross-section, joint hard point position, body CAS, and vehicle envelope. Through sensitivity analysis, the cross-section and joints at key positions can be quickly found. The optimization of joints and cross-sections can quickly find joints and cross-sections suitable for this vehicle model in conceptual design. The model can be easily and quickly changed and replaced, which is suitable for the characteristics of conceptual design. The conceptual stage provides relatively little data, and this model only needs cross-section information or replacement of joints, which reduces the company's R&D cycle, allows real-time grasp of vehicle body performance in the conceptual design stage, and reduces unnecessary repetitive labor.

[0119] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the present invention is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described herein, and the description of the above specific languages ​​is for disclosing the best mode of the present invention.

[0120] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0121] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0122] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0123] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0124] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the conceptual stage automotive body forward design device according to an embodiment of the present invention. The present invention may also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0125] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A forward design method for a car body at the conceptual stage, wherein: The method comprises: Build a body-in-white solid grid skeleton model based on the basic parameters of the concept design body and the CAS data of the previous platform model and body; According to the collision and stiffness requirements of the concept car, the body-in-white solid grid skeleton model is optimized to obtain the best force transmission path of the body-in-white; Interpret the optimized body-in-white solid mesh skeleton model and convert the optimized body-in-white solid mesh model into a body-in-white skeleton geometric model; Determine the key sections, joint hard points, beams, and reinforcement locations of the body in white according to actual engineering requirements; Determine competing vehicles based on vehicle model market price positioning and basic parameter information, wherein the basic parameter information includes length, width and height; and establish a competing vehicle database based on existing vehicle model information; Based on the competitive vehicle database and the determined key sections and joint hard point locations, a hybrid model of the upper body section joint simple model and the lower body 3D conceptual data is constructed; The hybrid model is subjected to section sensitivity analysis and joint sensitivity analysis respectively, and the section and joint numbers with the highest sensitivity ranking under the corresponding working conditions are obtained. The section and joint parameters with the corresponding numbers are retrieved from the competitive vehicle database and brought into the hybrid model to perform structural optimization on the sections and joints of the upper vehicle body. Structural optimization is performed on the three-dimensional conceptual data of the lower vehicle body of the hybrid model to obtain a three-dimensional data model of the lower vehicle body; Based on the optimized body sections, joints and frames of the body-in-white and the optimized 3D conceptual data of the lower body, a 3D data model of the body-in-white concept is constructed; Verify whether the performance of each subject of the 3D data model of the body-in-white concept meets the requirements; The step of constructing a hybrid model of the upper body section joint simple model and the lower body three-dimensional conceptual data based on the competitive vehicle database and the determined key sections and joint hard point positions specifically includes: A simple model of the upper body section joint is established based on the key sections and joint hard points; Based on the distribution results of beams and reinforcements in the optimized body-in-white solid grid skeleton model and the actual ergonomics situation, a three-dimensional conceptual model of the lower body is built; Randomly select a model combination in the competitive vehicle database; A hybrid model is constructed by assembling a simple model of the upper body section joint and the 3D conceptual data of the lower body.

2. The method according to claim 1, wherein: The collision includes frontal collision, offset collision, side collision and rear collision, and the stiffness includes bending stiffness and torsional stiffness.

3. The method according to claim 1, wherein: The geometric model of the body-in-white skeleton includes the transverse and longitudinal beams, the overall layout space of each component, and the material distribution of the area that needs to be strengthened.

4. The method according to claim 1, wherein: The competitor vehicle database includes a vehicle class, vehicle model, section and joint database.

5. A concept-stage automobile body forward design device, wherein: The device comprises: The grid model building module is suitable for building a body-in-white solid grid skeleton model based on the basic parameters of the concept design body and the CAS data of the previous platform model and body; The mesh model optimization module is suitable for optimizing the body-in-white solid mesh skeleton model according to the collision and stiffness requirements of the concept car to obtain the best force transmission path of the body-in-white; A geometric model conversion module, which is suitable for interpreting the optimized body-in-white solid mesh skeleton model and converting the optimized body-in-white solid mesh skeleton model into a body-in-white skeleton geometric model; The key information determination module is suitable for determining the key sections, joint hard points, crossbeams, and reinforcement positions of the body in white according to actual engineering requirements; A competitor car database establishment module is adapted to determine a competitor car based on the market price positioning and basic parameter information of the vehicle model, wherein the basic parameter information includes length, width and height; and establish a competitor car database based on the existing vehicle model information; A hybrid model building module is suitable for building a hybrid model of the upper body section joint simple model and the lower body 3D conceptual data based on the competitive vehicle database and the determined key section and joint hard point positions; A hybrid model analysis and optimization module is suitable for performing section sensitivity analysis and joint sensitivity analysis on the hybrid model, obtaining the section and joint numbers with the highest sensitivity rankings under the corresponding working conditions, and retrieving the section and joint parameters of the corresponding numbers from the competitive vehicle database and bringing them into the hybrid model to perform structural optimization on the sections and joints of the upper vehicle body; A lower body structure optimization module, adapted to perform structural optimization on the three-dimensional conceptual data of the lower body of the hybrid model and obtain a three-dimensional data model of the lower body; The 3D model assembly module is suitable for assembling a 3D data model of the body-in-white concept according to the optimized body section, joints and skeleton of the body-in-white and the optimized 3D conceptual data of the lower body; 3D model verification module, suitable for verifying whether the performance of each subject of the 3D data model of the body-in-white concept meets the requirements; Wherein, the hybrid model assembly module is further suitable for establishing a simple model of the upper body section joint according to the key sections and joint hard points; Based on the distribution results of beams and reinforcements in the optimized body-in-white solid grid skeleton model and the actual ergonomics situation, a three-dimensional conceptual model of the lower body is built; Randomly select a model combination in the competitive vehicle database; A hybrid model is constructed by assembling a simple model of the upper body section joint and the 3D conceptual data of the lower body.

6. The device according to claim 5, wherein: The collision includes frontal collision, offset collision, side collision and rear collision, and the stiffness includes bending stiffness and torsional stiffness.

7. The device according to claim 5, wherein: The geometric model of the body-in-white skeleton includes the transverse and longitudinal beams, the overall layout space of each component, and the material distribution of the area that needs to be strengthened.

8. The device according to claim 5, wherein: The competitor vehicle database includes a vehicle class, vehicle model, section and joint database.

9. A concept stage automobile body forward design system, comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the concept-stage automobile body forward design method according to any one of claims 1-4.

10. A computer storage medium, wherein at least one executable instruction is stored in the storage medium, and wherein the executable instruction enables a processor to execute the concept-stage automobile body forward design method according to any one of claims 1 to 4.

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