Vehicle front bumper sag analysis method and device, vehicle, and storage medium
By preprocessing and stiffness calculation of the geometric model of the vehicle's front bumper, the key installation points affecting the sinking are determined, which solves the problems of long calculation cycle and high cost of the whole vehicle model, and realizes simplified analysis and efficient design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA FAW CO LTD
- Filing Date
- 2026-03-25
- Publication Date
- 2026-07-10
Smart Images
Figure CN122365702A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, vehicle, and storage medium for analyzing the sagging of a vehicle's front bumper. Background Technology
[0002] The vehicle bumper is a core component of a vehicle, and its assembly precision, service safety, and stability are of great concern. The issue of front bumper sagging is a key consideration in vehicle design, directly affecting its assembly and performance.
[0003] In related technologies, the main methods used are to measure and control the amount of subsidence and to calculate the amount of subsidence through simulation analysis, in order to conduct research on the simulation of front bumper subsidence, structural design optimization, and related devices for controlling the amount of subsidence.
[0004] However, since the research on vehicle front bumpers in related technologies is mainly focused on whole vehicles or overall models, it leads to problems such as long calculation cycles, high control difficulty, and high calculation and R&D costs, which urgently need to be solved. Summary of the Invention
[0005] This application provides a method, device, vehicle, and storage medium for analyzing the downward displacement of a vehicle's front bumper, in order to solve the problems of long calculation cycles, high control difficulty, and high calculation and R&D costs in related technologies, thereby reducing repetitive calculations and improving efficiency.
[0006] To achieve the above objectives, the first aspect of this application provides a method, apparatus, vehicle, and storage medium for analyzing the downward displacement of a vehicle's front bumper, comprising the following steps:
[0007] The geometric model of the vehicle is determined, and the geometric model of the vehicle is preprocessed to obtain the processed whole vehicle model. The processed whole vehicle model is then simulated to obtain the front bumper sinking amount corresponding to the processed whole vehicle model. Based on the processed vehicle model, the stiffness of the front bumper and the mounting point on the vehicle body is calculated to obtain the stiffness calculation result. The front bumper body is extracted from the processed vehicle model, and based on the stiffness calculation result, the front bumper sinking amount corresponding to the front bumper body is calculated. If the error between the front bumper dip amount corresponding to the processed vehicle model and the front bumper dip amount corresponding to the front bumper body is less than a preset error, the stiffness calculation result is substituted into the front bumper body, and at least one target mounting point affecting the dip sensitivity of the front bumper body and the stiffness of each target mounting point are determined based on the front bumper body after incorporating the stiffness calculation result.
[0008] According to one embodiment of this application, the preprocessing of the vehicle's geometric model to obtain the processed vehicle model includes: Based on a preset mesh size, the geometric model of the vehicle is divided into meshes to obtain an initial whole vehicle model; The initial vehicle model is connected and its mesh quality is checked to obtain the processed vehicle model.
[0009] According to one embodiment of this application, the step of calculating the stiffness of the front bumper and the body mounting point based on the processed vehicle model to obtain the stiffness calculation result includes: The mounting holes of the front bumper are connected using a first rigid unit, and the mounting holes of the vehicle body mounting point are connected using a second rigid unit. The first rigid unit and the second rigid unit are connected by an elastic connection unit, and the sum of the stress values of the front bumper and the vehicle body mounting point in a first preset direction is calculated. Calculate the gravity value of the front bumper under a preset gravitational acceleration; If the stress value is always equal to the gravity value, then the mounting holes of the front bumper and the mounting holes of the vehicle body mounting points are fixed by a third rigid unit, and a preset force is applied in a second preset direction at the junction of each third rigid unit to obtain the stiffness calculation result.
[0010] According to one embodiment of this application, determining at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point based on the stiffness calculation results of the front bumper body includes: Based on the front bumper body after the stiffness calculation results are applied, a sensitivity analysis is performed on the vehicle mounting point to obtain the sensitivity analysis results. Based on preset sensitivity conditions, at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are determined according to the sensitivity analysis results.
[0011] According to one embodiment of this application, after determining at least one target mounting point affecting the front bumper body's dip sensitivity and the stiffness of each target mounting point based on the stiffness calculation results, the method further includes: Determine multiple new vehicle geometric models and repeat the steps of preprocessing the vehicle geometric models to obtain the processed whole vehicle model until multiple sets of at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are obtained. Based on at least one target mounting point that affects the front bumper body's sinking sensitivity and the stiffness of each target mounting point, the final stiffness of the vehicle body mounting point is determined.
[0012] According to the vehicle front bumper sag analysis method proposed in this application, the vehicle's geometric model is preprocessed to obtain a whole vehicle model, and simulation calculations are performed to obtain the corresponding front bumper sag. Based on the whole vehicle model, the front bumper sag corresponding to the front bumper body is calculated. If the front bumper sag corresponding to the whole vehicle model and the front bumper sag corresponding to the front bumper body are both less than a preset error, the mounting points and corresponding stiffness affecting the front bumper body sag sensitivity are determined. This solves the problems of long calculation cycles, high control difficulty, and high calculation and R&D costs in related technologies, reduces repetitive calculations, and improves efficiency.
[0013] To achieve the above objectives, a second aspect of this application provides a vehicle front bumper dip analysis device, comprising: The module determines the geometric model of the vehicle, preprocesses the geometric model to obtain the processed whole vehicle model, and performs simulation calculations on the processed whole vehicle model to obtain the front bumper sinking amount corresponding to the processed whole vehicle model. The calculation module calculates the stiffness of the front bumper and the mounting point of the vehicle body based on the processed vehicle model to obtain the stiffness calculation result, extracts the front bumper body from the processed vehicle model, and calculates the front bumper sinking amount corresponding to the front bumper body based on the stiffness calculation result. The analysis module, when the error between the front bumper dip corresponding to the processed vehicle model and the front bumper dip corresponding to the front bumper body is less than a preset error, inputs the stiffness calculation result into the front bumper body, and determines at least one target mounting point and the stiffness of each target mounting point based on the front bumper body after inputting the stiffness calculation result.
[0014] According to one embodiment of this application, the determining module is specifically used for: Based on a preset mesh size, the geometric model of the vehicle is divided into meshes to obtain an initial whole vehicle model; The initial vehicle model is connected and its mesh quality is checked to obtain the processed vehicle model.
[0015] According to one embodiment of this application, the computing module is specifically used for: The mounting holes of the front bumper are connected using a first rigid unit, and the mounting holes of the vehicle body mounting point are connected using a second rigid unit. The first rigid unit and the second rigid unit are connected by an elastic connection unit, and the sum of the stress values of the front bumper and the vehicle body mounting point in a first preset direction is calculated. Calculate the gravity value of the front bumper under a preset gravitational acceleration; If the stress value is always equal to the gravity value, then the mounting holes of the front bumper and the mounting holes of the vehicle body mounting points are fixed by a third rigid unit, and a preset force is applied in a second preset direction at the junction of each third rigid unit to obtain the stiffness calculation result.
[0016] According to one embodiment of this application, the analysis module is specifically used for: Based on the front bumper body after the stiffness calculation results are applied, a sensitivity analysis is performed on the vehicle mounting point to obtain the sensitivity analysis results. Based on preset sensitivity conditions, at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are determined according to the sensitivity analysis results.
[0017] According to one embodiment of this application, the analysis module is further configured to: Determine multiple new vehicle geometric models and repeat the steps of preprocessing the vehicle geometric models to obtain the processed whole vehicle model until multiple sets of at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are obtained. Based on at least one target mounting point that affects the front bumper body's sinking sensitivity and the stiffness of each target mounting point, the final stiffness of the vehicle body mounting point is determined.
[0018] The vehicle front bumper dip analysis device proposed in this application preprocesses the vehicle's geometric model to obtain a whole vehicle model, and performs simulation calculations to obtain the corresponding front bumper dip amount. Based on the whole vehicle model, the dip amount corresponding to the front bumper body is calculated. If the dip amounts corresponding to the whole vehicle model and the front bumper body are both less than a preset error, the installation points and corresponding stiffness affecting the dip sensitivity of the front bumper body are determined. This solves the problems of long calculation cycles, high control difficulty, and high calculation and development costs in related technologies, reduces repetitive calculations, and improves efficiency.
[0019] To achieve the above objectives, a third aspect of this application provides a vehicle comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle front bumper sagging analysis method as described in the above embodiments.
[0020] To achieve the above objectives, a fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the vehicle front bumper sagging analysis method as described in the above embodiments.
[0021] To achieve the above objectives, a fifth aspect of this application provides a computer program product, which, when executed by a processor, implements the vehicle front bumper sagging analysis method as described in the above embodiments.
[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a method for analyzing the sagging of a vehicle front bumper according to an embodiment of this application; Figure 2 This is a schematic diagram of a processed vehicle model according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the stiffness calculation of a vehicle body mounting point according to an embodiment of this application; Figure 4 This is a simplified model diagram illustrating the stiffness combination of the front bumper body and the mounting point according to an embodiment of this application; Figure 5 This is a schematic diagram of a front bumper model of a passenger vehicle according to an embodiment of this application; Figure 6 This is a schematic diagram showing the gravity and stiffness of various mounting points on a front bumper model according to an embodiment of this application; Figure 7 This is a schematic diagram comparing the front bumper recess of a vehicle model and the front bumper body according to an embodiment of this application. Figure 8 This is a schematic diagram illustrating the sensitivity analysis of various mounting points on a front bumper model of a passenger vehicle according to an embodiment of this application. Figure 9 This is a flowchart of a vehicle front bumper sagging analysis method according to an embodiment of this application; Figure 10 This is a block diagram of a vehicle front bumper sagging analysis device provided according to an embodiment of this application; Figure 11 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation
[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0025] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to specific embodiments.
[0026] Those skilled in the art will understand that research on bumpers primarily focuses on bumper mounting connectors, bumper anti-sag, bumper component strength, and bumper durability analysis. For example, related technologies propose "a front bumper sagging simulation compensation device and method," which identifies and compensates for the specific sagging of the bumper assembly in the early stages of industrialization based on the gap adjustment between the front bumper assembly and the front grille. Another example is the application of "sag CAE (Computer Aided Engineering) analysis in the precision management of automotive front bumper assemblies," which uses CAE simulation analysis to identify and optimize the risk of front bumper sagging. Therefore, the sagging of the automotive front bumper is particularly important for vehicle design.
[0027] However, related technologies mainly focus on research into devices to prevent bumper sagging, studies on simulating and compensating for bumper assembly sagging, and studies on the sagging of the front bumper assembly and the HOOD (Engine Hood) mating area based on simulation analysis. Therefore, research on simplified analysis methods for front bumper sagging, including aspects such as mounting point stiffness, stress, key point determination, and the determination of simplified analysis methods, is still insufficient.
[0028] The following description, with reference to the accompanying drawings, describes the vehicle front bumper sagging analysis method, apparatus, vehicle, and storage medium according to embodiments of this application. First, the vehicle front bumper sagging analysis method according to embodiments of this application will be described with reference to the accompanying drawings.
[0029] Figure 1 This is a flowchart of a vehicle front bumper sagging analysis method according to an embodiment of this application.
[0030] like Figure 1 As shown, the method for analyzing the front bumper sagging of this vehicle includes the following steps: In step S101, the geometric model of the vehicle is determined, and the geometric model of the vehicle is preprocessed to obtain the processed whole vehicle model. The processed whole vehicle model is then simulated to obtain the front bumper sinking amount corresponding to the processed whole vehicle model.
[0031] Optionally, in some embodiments, the geometric model of the vehicle is preprocessed to obtain a processed vehicle model, including: meshing the geometric model of the vehicle based on a preset mesh size to obtain an initial vehicle model; and performing model connection and mesh quality checks on the initial vehicle model to obtain a processed vehicle model.
[0032] The front bumper sag refers to the vertical downward displacement of a key point on the front bumper under its own weight. The preset mesh size can be user-defined, obtained through a limited number of experiments, or derived from a limited number of computer simulations. Model connection refers to establishing corresponding simulated connection relationships between the front bumper and the vehicle body, and between the headlights and the bumper body, based on the actual assembly relationships and force transmission characteristics of the vehicle's components. Mesh quality inspection refers to the process of individually checking and evaluating key quality indicators such as the size, shape, warpage, aspect ratio, and Jacobian determinant of each mesh cell.
[0033] Specifically, this application embodiment determines the geometric model of the vehicle, wherein the geometric model includes a front bumper, body, hood, fenders, wheel arches, and underbody protection plates, etc. This application embodiment divides the vehicle's geometric model into an initial whole vehicle model using a preset mesh size, which can be 5mm.
[0034] Furthermore, such as Figure 2 As shown, Figure 2 This is a schematic diagram of a processed vehicle model according to an embodiment of this application. In this embodiment, a rigid connection is established between the fixed points of the front bumper and the vehicle body using preset rigid elements. This completes pre-processing operations such as mesh quality checking and model connection for the vehicle model. Simultaneously, material thickness is assigned to each component of the vehicle model, and material and structural properties are defined, along with parameter settings for the gravity load analysis step. Based on this, reasonable constraints are applied to the vehicle model, and gravitational acceleration is applied to obtain the processed vehicle model.
[0035] Furthermore, based on the processed vehicle model, simulation calculations were performed under gravity acceleration conditions to obtain the amount of front bumper sinking under rigid conditions.
[0036] In step S102, based on the processed vehicle model, the stiffness of the front bumper and the mounting point of the vehicle body is calculated to obtain the stiffness calculation result. The front bumper body is extracted from the processed vehicle model, and based on the stiffness calculation result, the front bumper sinking amount corresponding to the front bumper body is calculated.
[0037] Optionally, in some embodiments, based on the processed vehicle model, the stiffness of the front bumper and the mounting point on the vehicle body is calculated to obtain the stiffness calculation result, including: connecting the mounting holes of the front bumper using a first rigid unit and connecting the mounting holes of the vehicle body mounting point using a second rigid unit, wherein the first rigid unit and the second rigid unit are connected by an elastic connection unit, and calculating the sum of stress values of the front bumper and the mounting point on the vehicle body in a first preset direction; calculating the gravity value of the front bumper under a preset gravitational acceleration; if the total stress value is equal to the gravity value, then fixing the mounting holes of the front bumper and the mounting holes of the vehicle body mounting point through a third rigid unit, and applying a preset force in a second preset direction at the junction of each third rigid unit to obtain the stiffness calculation result.
[0038] The front bumper body refers to the structural assembly consisting of the bumper and headlights, extracted separately from the processed vehicle model. A rigid connection unit is a simulation unit used to simulate rigid connections in engineering structures without relative deformation or displacement. An elastic connection unit is a simulation unit used to simulate flexible connections between engineering structures that possess stiffness characteristics, can transmit force and displacement, and allow for minor deformation. The first and second preset directions can be user-defined directions, directions obtained through a finite number of experiments, or directions obtained through a finite number of computer simulations. The preset values can be user-defined values, values obtained through a finite number of experiments, or values obtained through a finite number of computer simulations.
[0039] Specifically, in this embodiment, the mounting holes of the front bumper are connected via a first rigid unit, and the mounting holes of the vehicle body mounting points are connected via a second rigid unit. The first and second rigid units are then connected via an elastic connection unit (CONN3D). The stress values of the front bumper and vehicle body mounting points in a first preset direction are obtained through simulation calculations, and the sum of the stress values of all mounting points in the first preset direction is calculated. The first preset direction can be set to the Z-direction. This embodiment further calculates the gravity value of the front bumper body under a preset gravitational acceleration g. If the sum of the stress values equals the gravity value, it can be determined that the processed vehicle model completely includes all mounting points of the front bumper and vehicle body, with no missing mounting points.
[0040] Furthermore, such as Figure 3 As shown, Figure 3This is a schematic diagram of stiffness calculation for vehicle body mounting points according to an embodiment of this application. In the processed vehicle model, the front bumper and the mounting holes corresponding to the vehicle body mounting points are fixedly connected by a third rigid unit. Then, a preset force is applied at the junction of each Rigid unit along a second preset direction, and the stiffness value of each mounting point is obtained through simulation calculation. The second preset direction can be set as the Z-direction, and the preset value can be 100N. In this embodiment, the front bumper body is extracted separately from the processed vehicle model. Rigid units are used to rigidly fix each mounting point of the front bumper body, and then flexible connection units are used to connect the mounting points. The stiffness values of each mounting point calculated in the processed vehicle model are assigned to the flexible connection units. Furthermore, the other end of the flexible connection unit is constrained and gravitational acceleration is applied. Subsequently, the front bumper sinking corresponding to the front bumper body is obtained through simulation calculation.
[0041] In step S103, if the error between the front bumper dip amount corresponding to the processed whole vehicle model and the front bumper dip amount corresponding to the front bumper body is less than the preset error, the stiffness calculation result is substituted into the front bumper body, and at least one target mounting point affecting the dip sensitivity of the front bumper body and the stiffness of each target mounting point are determined based on the front bumper body after incorporating the stiffness calculation result.
[0042] Optionally, in some embodiments, determining at least one target mounting point and the stiffness of each target mounting point that affect the downward sensitivity of the front bumper body based on the front bumper body after inputting the stiffness calculation results includes: performing sensitivity analysis on the vehicle body mounting points based on the front bumper body after inputting the stiffness calculation results to obtain sensitivity analysis results; and determining at least one target mounting point and the stiffness of each target mounting point that affect the downward sensitivity of the front bumper body based on the sensitivity analysis results according to preset sensitivity conditions.
[0043] The preset error can be a user-defined error, an error obtained through a limited number of experiments, or an error obtained through a limited number of computer simulations. The front bumper body drop sensitivity refers to the degree of response of the front bumper body drop to changes in the stiffness parameters of the connection point between the vehicle body and the front bumper.
[0044] Specifically, when the error between the front bumper dip corresponding to the processed vehicle model and the front bumper dip corresponding to the front bumper body is less than a preset error (e.g., 5%), the calculated mounting point stiffness is deemed valid. That is, the front bumper body combined with this valid mounting point stiffness forms a simplified model that can be used for subsequent analysis. Figure 4 As shown, Figure 4This is a simplified schematic diagram of the front bumper body and mounting point rigidity according to an embodiment of this application.
[0045] Furthermore, this embodiment incorporates the stiffness of the mounting points into the front bumper body and conducts sensitivity analysis. Using the baseline stiffness value of each mounting point as a reference, a preset stiffness value (e.g., 100 N / mm) is adjusted upwards and downwards. If the stiffness value becomes negative after downward adjustment, the adjustment range for the mounting point stiffness is set to 0-200 N / mm. Simulation calculations are used to analyze the change in the front bumper body's subsidence under different stiffness adjustments, thereby determining the degree of influence of the stiffness of each mounting point on the bumper subsidence and obtaining the sensitivity analysis results. Based on the sensitivity analysis results, this embodiment selects and summarizes the specific locations of highly sensitive mounting points that significantly affect the front bumper subsidence, as well as the corresponding baseline stiffness values for these highly sensitive mounting points.
[0046] To help those skilled in the art to further understand the vehicle front bumper sagging analysis method proposed in the embodiments of this application, further explanation is provided below with reference to specific embodiments.
[0047] like Figure 5 As shown, Figure 5 This is a schematic diagram of a front bumper model of a passenger vehicle according to an embodiment of this application. The diagram clearly marks the mounting points of the bumper and headlights on the front bumper model, providing clear location markers for subsequent stiffness calculations and sensitivity analyses. Figure 6 As shown, Figure 6 Based on a schematic diagram of the gravity and stiffness of each mounting point on a front bumper model provided in an embodiment of this application, the stiffness of the mounting points is incorporated into a simplified model combining the stiffness of the front bumper body and the mounting points to calculate the front bumper subsidence corresponding to the front bumper body. For example... Figure 7 As shown, Figure 7 This is a schematic diagram comparing the front bumper recess amount corresponding to the whole vehicle model and the front bumper recess amount corresponding to the front bumper body, according to an embodiment of this application. Figure 7 (a) is a schematic diagram of the front bumper dip corresponding to a vehicle model provided according to an embodiment of this application; Figure 7 (b) is a comparative schematic diagram of the front bumper dip corresponding to the front bumper body provided according to an embodiment of this application; Figure 7(c) is a schematic diagram showing the distribution of the contribution of each mounting point to the front bumper sinking amount according to an embodiment of this application. As can be seen from the figure, the front bumper sinking amount corresponding to the whole vehicle model is 0.47mm, and the front bumper sinking amount corresponding to the front bumper body is 0.467mm. The error between the front bumper sinking amount corresponding to the whole vehicle model and the front bumper sinking amount is 0.6%, which is less than the preset error of 5%. This fully verifies the feasibility and accuracy of using a lightweight model with the stiffness of the front bumper body plus the mounting points to replace the whole vehicle model for sinking analysis.
[0048] Furthermore, such as Figure 8 As shown, Figure 8 This is a schematic diagram illustrating the sensitivity analysis of various mounting points on a front bumper model of a passenger vehicle according to an embodiment of this application. Figure 8 (a) is a schematic diagram illustrating the influence of each mounting point on the front bumper sag according to an embodiment of this application. Figure 8 (b) is the stiffness distribution of high-sensitivity mounting points corresponding to different functional areas according to an embodiment of this application. Figure 8 As shown in (a), N17 has the highest sensitivity and is the core critical mounting point affecting bumper sagging, contributing up to 80% of the total bumper sagging. If the core midpoint N17 is removed, the total contribution drops sharply to 30%. Mounting points N19, N16, N2, and N6 also exhibit high sensitivity and significantly affect the sagging amount. However, most mounting points, such as N3-N5, N1, N21, N7, N24-N26, and N8, have relatively low sensitivity and less impact on the bumper sagging amount. Figure 8 As shown in (b), the peak stiffness at the mounting point in the middle support area is the highest. Therefore, Figure 8 This intuitively demonstrates the core and dominant role of the N17 and the mounting points in the middle bracket area in controlling the bumper's downward movement, providing a targeted basis for optimizing the rigidity and designing the mounting points at the vehicle body.
[0049] Therefore, this application proposes a simplified analysis and optimization method for front bumper sag, which simplifies the calculation method for bumper sag and allows for a systematic study of the load and deformation characteristics of the bumper mounting point. It accurately identifies key mounting points affecting bumper sag and determines their stiffness, providing a quantitative basis for the design of mounting points on the vehicle body and establishing a forward design capability for the vehicle body and front bumper mounting points. This method can directly extract the bumper body, define the upper limit of stiffness at its mounting point, and calculate the sag, completely replacing the original whole-vehicle model calculation scheme. This significantly saves calculation time, computational resources, and R&D costs, while providing a clear direction for optimizing key mounting points and effectively controlling the bumper sag. For similar bumper designs or vehicle upgrades, the problem of excessive sag can be avoided by verifying the stiffness of the mounting points on the vehicle body, reducing repetitive simulation analysis, significantly shortening the product design and simulation cycle, and accumulating relevant development experience.
[0050] Furthermore, in order to improve the versatility and reliability of the stiffness design indicators for vehicle body mounting points, this application embodiment also performs simulation analysis on geometric models of multiple vehicle types.
[0051] Optionally, in some embodiments, after determining at least one target mounting point affecting the front bumper body's sag sensitivity and the stiffness of each target mounting point based on the stiffness calculation results, the method further includes: determining multiple new vehicle geometric models, and repeatedly performing the step of preprocessing the vehicle geometric models to obtain a processed whole vehicle model, until multiple sets of at least one target mounting point affecting the front bumper body's sag sensitivity and the stiffness of each target mounting point are obtained; and determining the final stiffness of the vehicle body mounting point based on the multiple sets of at least one target mounting point affecting the front bumper body's sag sensitivity and the stiffness of each target mounting point.
[0052] Specifically, this embodiment expands the sample size by acquiring multiple new vehicle geometric models, repeats all the aforementioned analysis steps, calculates the high-sensitivity locations of the front bumper mounting points for each vehicle model, and the corresponding reference stiffness values for each high-sensitivity location, and performs statistical analysis on the data. Based on the statistical results, common high-sensitivity locations of the front bumper mounting points are summarized, and the maximum value of the reference stiffness value corresponding to each common high-sensitivity location is extracted. This value is used as a general indicator for the stiffness design of the vehicle body mounting points, providing a quantitative basis for the forward design of the front bumper mounting points.
[0053] On the one hand, the embodiments of this application calculate the stiffness of the bumper and the mounting point on the vehicle body. At the same time, by increasing the sample calculation, the stiffness of the front bumper mounting point is obtained. The stiffness data of the mounting points at the same position in different models are summarized and the maximum value is extracted and used as the design basis for the stiffness of the front bumper mounting point on the vehicle body.
[0054] On the other hand, the embodiments of this application determine the high-sensitivity position of the front bumper body mounting point and the corresponding stiffness limit value. In the process of similar bumper design or vehicle upgrade development, the high-sensitivity mounting position is used as the verification point. The actual calculated stiffness of the mounting point is compared with the stiffness limit value of the corresponding position. If the stiffness value is greater than the limit value, it is determined that the design requirements are met. If it is lower than the limit value, the mounting point is optimized in a targeted manner. In this way, the traditional whole vehicle model calculation is converted into the stiffness calculation of the mounting point at the body end, replacing the original calculation scheme, greatly saving simulation calculation time, and accurately locking the core key factors affecting the bumper sinking.
[0055] This provides a unified and precise quantitative basis for the front bumper drop control and the forward design of the mounting points at the vehicle body end for different vehicle models, effectively improving design adaptability and drop control effect.
[0056] Therefore, the embodiments of this application simplify the front bumper sag analysis method, significantly reducing computational time and cost. Compared to traditional complete model calculations, it greatly reduces model debugging time, thereby shortening the mid-term of design and development and improving efficiency. It can determine the location of key mounting points between the bumper and the vehicle body, providing a design basis for the design and optimization of the mounting points at the vehicle body. By designing the stiffness of the mounting points at the vehicle body, the amount of bumper sag can be effectively reduced. For front bumpers with the same mounting structure, the stiffness verification and optimization of the mounting points at the vehicle body can directly replace the bumper sag simulation analysis calculation, reducing repetitive calculations. Based on the summarized bumper mounting point stiffness, the upper limit value is taken as the design basis, and the stiffness can be incorporated into the bumper body to calculate the bumper body sag, replacing the original overall calculation method.
[0057] To facilitate a better understanding of the vehicle front bumper sagging analysis method proposed in the embodiments of this application by those skilled in the art, the following is combined with... Figure 9 Further explanation is needed.
[0058] like Figure 9 As shown, Figure 9 This is a flowchart of a vehicle front bumper sagging analysis method according to an embodiment of this application, which includes the following steps: S901, begin.
[0059] S902, the initial whole vehicle model is obtained by meshing the front bumper, body, hood accessories, etc. of the vehicle geometry model.
[0060] S903 performs model connection and mesh checking on the initial vehicle model.
[0061] S904 defines the material, properties, and load analysis steps to obtain the processed vehicle model.
[0062] S905, calculates the front bumper dip in the overall model.
[0063] S906 calculates the Z-direction stress distributed at the front bumper mounting point.
[0064] S907, calculate the Z-direction stress at the mounting point and the weight of the front bumper body.
[0065] S908, determine whether the Z-direction stress at the mounting point is equal to the weight of the front bumper body. If so, proceed to step S909; otherwise, return to step S906.
[0066] S909, calculate the stiffness of the front bumper mounting point.
[0067] S910, incorporate the front bumper mounting point into the above stiffness calculation for the subsidence amount.
[0068] S911, determine whether the difference between the subsidence amount and the front bumper subsidence amount in S905 is less than 5%. If yes, proceed to step S912; otherwise, return to step S905.
[0069] S912, sensitivity analysis was performed on the front bumper body combined with the stiffness of the mounting point.
[0070] S913, summarizing the stiffness and location of high-sensitivity mounting points.
[0071] S914, Expand the calculation sample.
[0072] S915, summarize the locations of high-sensitivity mounting points and their upper limits of stiffness in the sample.
[0073] S916 outputs the position and upper limit of the stiffness of the front bumper mounting point on the vehicle body.
[0074] S917, End.
[0075] According to the vehicle front bumper sag analysis method proposed in this application, the vehicle's geometric model is preprocessed to obtain a whole vehicle model, and simulation calculations are performed to obtain the corresponding front bumper sag. Based on the whole vehicle model, the front bumper sag corresponding to the front bumper body is calculated. If the front bumper sag corresponding to the whole vehicle model and the front bumper sag corresponding to the front bumper body are both less than a preset error, the mounting points and corresponding stiffness affecting the front bumper body sag sensitivity are determined. This solves the problems of long calculation cycles, high control difficulty, and high calculation and R&D costs in related technologies, reduces repetitive calculations, and improves efficiency.
[0076] Next, referring to the accompanying drawings, the vehicle front bumper sinking analysis device proposed according to the embodiments of this application is described.
[0077] Figure 10 This is a block diagram of a vehicle front bumper sagging analysis device according to an embodiment of this application.
[0078] like Figure 10 As shown, the vehicle front bumper sagging analysis device 10 includes: a determination module 100, a calculation module 200, and an analysis module 300.
[0079] Module 100 is defined to determine the geometric model of the vehicle, and the geometric model of the vehicle is preprocessed to obtain the processed whole vehicle model. The processed whole vehicle model is then simulated to obtain the front bumper sinking amount corresponding to the processed whole vehicle model. The calculation module 200 calculates the stiffness of the front bumper and the mounting point of the vehicle body based on the processed vehicle model, obtains the stiffness calculation result, extracts the front bumper body from the processed vehicle model, and calculates the front bumper sinking amount corresponding to the front bumper body based on the stiffness calculation result. The analysis module 300, when the error between the front bumper depression corresponding to the processed whole vehicle model and the front bumper depression corresponding to the front bumper body is less than the preset error, inputs the stiffness calculation results into the front bumper body, and determines at least one target mounting point and the stiffness of each target mounting point based on the front bumper body after inputting the stiffness calculation results.
[0080] According to one embodiment of this application, the determining module 100 is specifically used for: Based on the preset mesh size, the geometric model of the vehicle is divided into meshes to obtain the initial whole vehicle model; The initial vehicle model is connected and the mesh quality is checked to obtain the processed complete vehicle model.
[0081] According to one embodiment of this application, the calculation module 200 is specifically used for: The mounting holes of the front bumper are connected using a first rigid unit, and the mounting holes of the vehicle body mounting points are connected using a second rigid unit. The first rigid unit and the second rigid unit are connected by an elastic connection unit, and the sum of the stress values of the front bumper and the vehicle body mounting points in the first preset direction is calculated. Calculate the force of gravity on the front bumper under a preset gravitational acceleration; If the stress value is always equal to the gravity value, the mounting holes of the front bumper and the mounting holes of the body mounting points are fixed by the third rigid unit, and a preset force is applied in the second preset direction at the joint position of each third rigid unit to obtain the stiffness calculation result.
[0082] According to one embodiment of this application, the analysis module 300 is specifically used for: Based on the front bumper body after incorporating the stiffness calculation results, a sensitivity analysis is performed on the vehicle body mounting points to obtain the sensitivity analysis results. Based on preset sensitivity conditions, at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are determined according to the sensitivity analysis results.
[0083] According to one embodiment of this application, the analysis module 300 is further configured to: Multiple new vehicle geometric models are determined, and the steps of preprocessing the vehicle geometric models to obtain the processed whole vehicle model are repeated until at least one target mounting point and the stiffness of each target mounting point are obtained, which affect the front bumper body's sinking sensitivity. The final stiffness of the vehicle body mounting point is determined based on at least one target mounting point that affects the front bumper body's sinking sensitivity and the stiffness of each target mounting point.
[0084] It should be noted that the foregoing explanation of the vehicle front bumper sagging analysis method embodiment also applies to the vehicle front bumper sagging analysis device of this embodiment, and will not be repeated here.
[0085] The vehicle front bumper dip analysis device proposed in this application preprocesses the vehicle's geometric model to obtain a whole vehicle model, and performs simulation calculations to obtain the corresponding front bumper dip amount. Based on the whole vehicle model, the dip amount corresponding to the front bumper body is calculated. If the dip amounts corresponding to the whole vehicle model and the front bumper body are both less than a preset error, the installation points and corresponding stiffness affecting the dip sensitivity of the front bumper body are determined. This solves the problems of long calculation cycles, high control difficulty, and high calculation and development costs in related technologies, reduces repetitive calculations, and improves efficiency.
[0086] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. The vehicle may include: The memory 1101, the processor 1102, and the computer program stored on the memory 1101 and executable on the processor 1102.
[0087] When the processor 1102 executes the program, it implements the vehicle front bumper sinking analysis method provided in the above embodiments.
[0088] Furthermore, the vehicle also includes: Communication interface 1103 is used for communication between memory 1101 and processor 1102.
[0089] The memory 1101 is used to store computer programs that can run on the processor 1102.
[0090] The memory 1101 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.
[0091] If the memory 1101, processor 1102, and communication interface 1103 are implemented independently, then the communication interface 1103, memory 1101, and processor 1102 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 11 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.
[0092] Optionally, in a specific implementation, if the memory 1101, processor 1102, and communication interface 1103 are integrated on a single chip, then the memory 1101, processor 1102, and communication interface 1103 can communicate with each other through an internal interface.
[0093] The processor 1102 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention.
[0094] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for analyzing the downward displacement of a vehicle's front bumper.
[0095] This application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps in any of the above embodiments of the vehicle front bumper sagging analysis method.
[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0097] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0098] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A method for analyzing the sagging of a vehicle's front bumper, characterized in that, include: The geometric model of the vehicle is determined, and the geometric model of the vehicle is preprocessed to obtain the processed whole vehicle model. The processed whole vehicle model is then simulated to obtain the front bumper sinking amount corresponding to the processed whole vehicle model. Based on the processed vehicle model, the stiffness of the front bumper and the mounting point on the vehicle body is calculated to obtain the stiffness calculation result. The front bumper body is extracted from the processed vehicle model, and based on the stiffness calculation result, the front bumper sinking amount corresponding to the front bumper body is calculated. If the error between the front bumper dip amount corresponding to the processed vehicle model and the front bumper dip amount corresponding to the front bumper body is less than a preset error, the stiffness calculation result is substituted into the front bumper body, and at least one target mounting point affecting the dip sensitivity of the front bumper body and the stiffness of each target mounting point are determined based on the front bumper body after incorporating the stiffness calculation result.
2. The method according to claim 1, characterized in that, The process of preprocessing the geometric model of the vehicle to obtain the processed whole vehicle model includes: Based on a preset mesh size, the geometric model of the vehicle is divided into meshes to obtain an initial whole vehicle model; The initial vehicle model is connected and its mesh quality is checked to obtain the processed vehicle model.
3. The method according to claim 1, characterized in that, The stiffness calculation results are obtained by calculating the stiffness of the front bumper and the body mounting point based on the processed vehicle model, including: The mounting holes of the front bumper are connected using a first rigid unit, and the mounting holes of the vehicle body mounting point are connected using a second rigid unit. The first rigid unit and the second rigid unit are connected by an elastic connection unit, and the sum of the stress values of the front bumper and the vehicle body mounting point in a first preset direction is calculated. Calculate the gravity value of the front bumper under a preset gravitational acceleration; If the stress value is always equal to the gravity value, then the mounting holes of the front bumper and the mounting holes of the vehicle body mounting points are fixed by a third rigid unit, and a preset force is applied in a second preset direction at the junction of each third rigid unit to obtain the stiffness calculation result.
4. The method according to claim 1, characterized in that, The determination of at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point based on the stiffness calculation results includes: Based on the front bumper body after the stiffness calculation results are applied, a sensitivity analysis is performed on the vehicle mounting point to obtain the sensitivity analysis results. Based on preset sensitivity conditions, at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are determined according to the sensitivity analysis results.
5. The method according to claim 1 or 4, characterized in that, After determining at least one target mounting point affecting the front bumper body's dip sensitivity and the stiffness of each target mounting point based on the stiffness calculation results, the process also includes: Determine multiple new vehicle geometric models and repeat the steps of preprocessing the vehicle geometric models to obtain the processed whole vehicle model until multiple sets of at least one target mounting point affecting the front bumper body's sinking sensitivity and the stiffness of each target mounting point are obtained. Based on at least one target mounting point that affects the front bumper body's sinking sensitivity and the stiffness of each target mounting point, the final stiffness of the vehicle body mounting point is determined.
6. A device for analyzing the sagging of a vehicle's front bumper, characterized in that, include: The module determines the geometric model of the vehicle, preprocesses the geometric model to obtain the processed whole vehicle model, and performs simulation calculations on the processed whole vehicle model to obtain the front bumper sinking amount corresponding to the processed whole vehicle model. The calculation module calculates the stiffness of the front bumper and the mounting point of the vehicle body based on the processed vehicle model to obtain the stiffness calculation result, extracts the front bumper body from the processed vehicle model, and calculates the front bumper sinking amount corresponding to the front bumper body based on the stiffness calculation result. The analysis module, when the error between the front bumper dip corresponding to the processed vehicle model and the front bumper dip corresponding to the front bumper body is less than a preset error, inputs the stiffness calculation result into the front bumper body, and determines at least one target mounting point and the stiffness of each target mounting point based on the front bumper body after inputting the stiffness calculation result.
7. The apparatus according to claim 6, characterized in that, The determining module is specifically used for: Based on a preset mesh size, the geometric model of the vehicle is divided into meshes to obtain an initial whole vehicle model; The initial vehicle model is connected and its mesh quality is checked to obtain the processed vehicle model.
8. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the simplified analysis method for vehicle front bumper sagging as described in any one of claims 1-5.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the simplified analysis method for vehicle front bumper sagging as described in any one of claims 1-5.
10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the simplified analysis method for vehicle front bumper sagging as described in any one of claims 1-5.