Method, device and system for verifying bearing structure of rear bumper

Abstract

The invention relates to a method, a device and a system for verifying a bearing structure of a rear bumper, and belongs to the field of bumper testing, and the method comprises the following steps: carrying out mechanical property simulation in a three-dimensional model of the rear bumper; fixing the rear bumper simulation real vehicle assembly posture, starting to test the rear bumper, and recording the actually measured deformation quantity in real time; calculating a safety coefficient K; according to the method, the same process is adopted in each testing process, testing is carried out under the same condition, the reference degree of a testing result is improved, meanwhile, the data of physical testing is compared with the data of analogue simulation, and the testing accuracy is improved. And according to the existing difference, whether the subsequent design of the rear bumper is improved and optimized or not is quickly judged.

Description

Technical Field

[0001] The invention belongs to the field of bumper testing, and in particular relates to a method, a device and a system for verifying the load-bearing structure of a rear bumper. Background Art

[0002] In the use of pickup trucks, transporting goods is often a more common form of use. When loading and unloading goods, people are often required to get on and off the pickup truck box to carry the goods. At this time, people need to step on the rear bumper at the rear of the pickup truck to facilitate getting on and off the box. The rear bumper of the pickup truck plays a supporting role for passengers to load and unload goods and get on and off the cargo box, and bears the load transmitted by the passengers' feet.

[0003] The rear bumper of a pickup truck is frequently used and has high requirements for mechanical properties. If the load-bearing capacity of the rear bumper is weak, it will cause product deformation and damage to internal electrical components. At the same time, the departure angle will become smaller, which will affect the vehicle's passability. Therefore, in the design of an actual rear bumper, it is often necessary to perform a structural mechanical performance analysis on the rear bumper of a pickup truck. For the structural mechanical performance analysis of the rear bumper, the prior art often uses the corresponding analysis software to perform mechanical performance simulation on the designed three-dimensional model of the rear bumper and to perform performance analysis of the rear bumper on a real vehicle.

[0004] However, there are still certain problems in the prior art: when using a real vehicle to analyze the performance of the rear bumper, it is necessary to install and disassemble the rear bumper on the whole vehicle, which is time-consuming and labor-intensive, and there is no unified calibration method for standard testing. The reference degree of the test results is low, and it is impossible to compare them with the mechanical performance simulation results of the three-dimensional model of the rear bumper in the analysis software. At this time, due to the material properties, processing technology of the rear bumper in the production process, and the differences between the three-dimensional model and the actual bumper, there is a deviation between the data of the actual test and the data of the simulation. It is impossible to intuitively compare the differences between the data of the actual test and the simulation, which is not convenient for subsequent improvement and optimization of the design of the rear bumper based on the data differences. Summary of the invention

[0005] In view of the problems in the prior art, the present invention provides a method, device and system for verifying the load-bearing structure of a rear bumper, which solves the problem of low reference level of test results caused by the lack of a calibration test method in the prior art, and also solves the problem of inconvenience in subsequently improving and optimizing the design of the rear bumper according to the data difference due to the inability to intuitively compare the differences between the data of the actual test and the simulation.

[0006] The technical solution adopted by the present invention is as follows: In a first aspect, the present application provides a method for verifying a load-bearing structure of a rear bumper, comprising the following steps: Step S0, establishing a three-dimensional model of the rear bumper and determining a number of target points; Step S1, uniformly applying a loading force from 0 N to a target point in the three-dimensional model of the rear bumper and uniformly unloading the loading force to 0 N to perform mechanical performance simulation, and record the simulated deformation in real time; Step S2, fixing the rear bumper in a simulated real vehicle assembly posture; Step S3, uniformly applying a loading force from 0 N to a target point on the rear bumper at the same position as the three-dimensional model, and uniformly unloading the loading force to 0 N, and recording the measured deformation in real time; Step S4, calculate the safety factor K under the same loading force. The safety factor K is the ratio of the measured deformation variable to the simulated deformation variable. When 1≤K≤1.1, the test requirements are met, the test of this target point is completed, and the process jumps to step S5; when K>1.1, the test is interrupted, feedback is given that structural optimization is required, and the process jumps to step S0; Step S5, determine whether there are still unmeasured target points. If there are still unmeasured target points, replace the next target point and jump to step S1; otherwise, end the test. Through the above method, the same process is used in each test process, and the test is carried out under the same conditions to improve the reference degree of the test results. At the same time, the actual test data is compared with the simulation data, and the difference is used to quickly determine whether the design of the rear bumper should be improved and optimized in the future.

[0007] Preferably, step S3 includes the following steps: Step S3-1, slowly and uniformly applying a loading force to a target point on the rear bumper at the same position as the three-dimensional model, and detecting the measured deformation in real time; Step S3-2: When the loading force reaches the preset value, maintain it for 1 hour and monitor the loading force value in real time; Step S3-3, unload the loading force to 0N, and detect the measured deformation in real time during the unloading process and within 1 hour after unloading. Applying the load slowly and evenly can avoid the influence of instantaneous impact on the test results, making the loading process closer to the actual working conditions; while maintaining the load force value for 1 hour and monitoring it in real time, the stability of the rear bumper under long-term stress can be observed; after unloading, the deformation is detected to accurately reflect the elastic recovery ability of the bumper. Combining these steps, the load-bearing and deformation characteristics of the rear bumper can be fully evaluated.

[0008] Preferably, in step S1, three target points are set, namely, point P1 located in the middle of the first-step pedal, points P2 and P3 located in the middle of the left and right sides of the second-step pedal. The above three target points are key parts of the rear bumper where the force is concentrated in actual use. Targeted testing can accurately control the load-bearing performance of the bumper in key areas to ensure safe use.

[0009] Preferably, in step S2, the posture of the rear bumper is monitored during the process of fixing the assembly posture of the rear bumper to simulate the actual vehicle, and the deviation of the assembly angle of the actual vehicle under the no-load state is ≤0.5°. This ensures that the test posture is highly consistent with the actual use, making the test data more valuable for reference and avoiding erroneous test conclusions due to differences in assembly posture.

[0010] In the second aspect, the present application provides a load-bearing structure verification device for a rear bumper, which is used to implement the method described in the first aspect, and includes a test bench and a monitoring component. The monitoring component includes a displacement sensor, an angle sensor and a pressure sensor. The displacement sensor and the angle sensor are used to detect the position and posture of the rear bumper. The pressure sensor is used to detect the value of the loading force. The test bench is provided with a tooling suspension beam and a loading component. The tooling suspension beam is used to install the rear bumper. The loading component includes a pressure unit, a cantilever and a loading block. The lower end of the pressure unit is arranged on the test bench, and the upper end of the pressure unit can reciprocate in the vertical direction. One end of the cantilever is arranged at the upper end of the pressure unit, and the loading block is fixedly arranged at the other end of the cantilever. By integrating the test bench and the monitoring component containing multiple sensors in the load-bearing structure verification device, the position, posture and loading force data of the rear bumper can be collected in real time and accurately. The tooling suspension beam facilitates the standardized installation of the rear bumper. The loading component has a reasonable structure. The pressure unit, the cantilever and the loading block can cooperate to flexibly apply the load, providing hardware guarantee for accurate measurement.

[0011] Preferably, a slide rail is provided on the test bench, a mortise groove is provided on the slide rail, a tenon is provided at the bottom of the pressure unit, and the tenon is movably arranged in the mortise groove. This mortise and tenon type movable connection structure not only ensures the smoothness of the horizontal movement of the pressure unit, facilitates the adjustment of the position according to different test requirements, but also has a certain positioning accuracy, thereby improving the usability and reliability of the entire test device.

[0012] Preferably, a mounting hole is provided at the upper end of the pressure unit, and the cantilever is movably arranged in the mounting hole. The pressure unit is also provided with a limiter, and the limiter is used to fix the cantilever in the mounting hole. The mounting hole and the limiter make the cantilever easy to install, and the cantilever extension length can be flexibly adjusted as needed to change the loading position and direction; on the other hand, the limiter can reliably fix the cantilever during the test, ensuring the stability of the loading process and preventing the cantilever from shaking and affecting the test accuracy.

[0013] Preferably, the pressure unit is a hydraulic cylinder, and the pressure sensor is arranged between the cantilever and the loading block, and the pressure sensor is used to detect the pressure between the cantilever and the loading block. The hydraulic cylinder is used as the pressure unit to provide a stable and controllable loading force to meet the requirements of loading forces of different sizes; the pressure sensor is arranged between the cantilever and the loading block, which can directly and accurately measure the actual pressure applied to the rear bumper, reduce the measurement error in the force transmission process, and improve the test accuracy.

[0014] Preferably, a plurality of displacement sensors are arranged on the test bench, the lower end of the displacement sensor is fixedly arranged on the test bench, and the upper end of the displacement sensor is in contact with the rear bumper to be tested. The lower ends of the plurality of displacement sensors are fixed to the test bench, and the upper ends are in contact with the rear bumper to be tested, so that the displacement changes of the rear bumper during the force-bearing process can be monitored in real time from multiple directions, and the deformation of the bumper can be captured in all directions, so as to provide detailed data support for analyzing its load-bearing capacity.

[0015] In a third aspect, the present application provides a rear bumper load-bearing structure verification system, including a rear bumper load-bearing structure verification device, and further comprising: A memory, used for storing data of the pressure sensor, the displacement sensor and the angle sensor; A processor, used to calculate the safety factor K of the first aspect and the determination in step S4 and step S5; HMI, HMI is used to display the test environment, angle deviation, simulated deformation variables of simulation test, measured deformation variables, safety factor K, and the change trend of simulated deformation variables and measured deformation variables; The controller is used to receive the data in the memory, the safety factor K of the processor, and the judgment result, and send the data to the HMI. The HMI intuitively displays all-round information of the test, including the test environment, angle deviation, simulated and measured deformation and its change trend, so that the operator can control the test dynamics in real time and adjust the test strategy in time.

[0016] It can be seen from the above technical solutions that the present invention has the following advantages: 1. Through the above method, the same process is adopted in each test process. Testing under the same conditions improves the reference degree of the test results. At the same time, the data of the actual test is compared with the simulation data. According to the existing differences, it is quickly determined whether the design of the rear bumper should be improved and optimized in the future.

[0017] 2. Applying the load slowly and evenly can avoid the influence of instantaneous impact on the test results, making the loading process closer to the actual working conditions; maintaining the load for 1 hour and monitoring the loading force in real time can observe the stability of the rear bumper under long-term stress; detecting the deformation after unloading can accurately reflect the elastic recovery ability of the bumper. Combining these steps can comprehensively evaluate the load-bearing and deformation characteristics of the rear bumper.

[0018] 3. The above three target points are the key parts of the rear bumper where the force is concentrated in actual use. Targeted testing can accurately control the load-bearing performance of the bumper in key areas to ensure safe use.

[0019] 4. Ensure that the test posture is highly consistent with actual use, making the test data more valuable for reference and avoiding erroneous test conclusions due to differences in assembly posture.

[0020] 5. By integrating the test bench and the monitoring components containing multiple sensors in the load-bearing structure verification device, the position, posture and loading force data of the rear bumper can be collected in real time and accurately. The tooling suspension beam facilitates the standardized installation of the rear bumper. The loading component has a reasonable structure. The pressure unit, cantilever and loading block can cooperate to flexibly apply the load, providing hardware guarantee for precise measurement.

[0021] 6. This mortise and tenon type mobile connection structure not only ensures the smooth horizontal movement of the pressure unit, making it convenient to adjust the position according to different test requirements, but also has a certain positioning accuracy, thus improving the usability and reliability of the entire test device.

[0022] 7. The installation holes and limiters make the cantilever installation convenient and the extension length of the cantilever can be flexibly adjusted as needed to change the loading position and direction. On the other hand, the limiters can reliably fix the cantilever during the test to ensure the stability of the loading process and avoid the shaking of the cantilever affecting the test accuracy.

[0023] 8. The hydraulic cylinder is used as the pressure unit to provide stable and controllable loading force to meet the requirements of different loading forces; the pressure sensor is set between the cantilever and the loading block to directly and accurately measure the actual pressure applied to the rear bumper, reduce the measurement error in the force transmission process, and improve the test accuracy.

[0024] 9. The lower ends of several displacement sensors are fixed on the test bench, and the upper ends are connected to the rear bumper to be tested. They can monitor the displacement changes of the rear bumper in the force-bearing process in real time from multiple directions, capture the deformation of the bumper in all directions, and provide detailed data support for analyzing its load-bearing capacity.

[0025] 10. The memory can completely store all kinds of sensor data, which is convenient for subsequent analysis and backtracking; the processor automatically completes complex safety factor calculations and test process judgments, improving efficiency and reducing human errors; the HMI intuitively displays all-round test information, including test environment, angle deviation, simulated and measured deformation variables and their changing trends, making it convenient for operators to control the test dynamics in real time and adjust the test strategy in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a schematic flow chart of the measuring method in the specific implementation example of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of a measuring device in a specific embodiment of the present invention.

[0029] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle.

[0030] Figure 4 It is a partial structural schematic diagram of a measuring device in an embodiment of a specific implementation manner of the present invention.

[0031] Figure 5 Schematic diagram of the position of the target point on the rear bumper in a specific embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of the HMI main interface in a specific implementation example of the present invention.

[0033] In the figure: 1. Experimental bench; 2. Displacement sensor; 3. Angle sensor; 4. Pressure sensor; 5. Rear bumper; 6. Pressure unit; 7. Cantilever; 8. Loading block; 9. Slide rail; 10. Mortise and tenon; 11. Tenon; 12. Mounting hole; 13. Limiting piece. DETAILED DESCRIPTION

[0034] In the detailed description below, various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives that fall within the spirit and scope of the various embodiments of the present disclosure.

[0035] In response to the problems in the prior art, the present invention provides a method, device and system for verifying the load-bearing structure of a rear bumper, which solves the problem of low reference level of test results due to the lack of a calibration test method in the prior art, and also solves the problem of being unable to intuitively compare the differences between the data of the physical test and the simulation data, which makes it inconvenient to subsequently improve and optimize the design of the rear bumper according to the data differences.

[0036] The following is an explanation of some terms in this plan to facilitate a better understanding of this plan: 1. CAE: CAE (Computer Aided Engineering) is a technical means of using computer technology to perform performance analysis, simulation, optimization and verification on engineering and products.

[0037] It covers knowledge and methods from multiple disciplines, and works on theoretical foundations such as finite element analysis, computational fluid dynamics, and multi-body dynamics. For example, in the automobile manufacturing industry, when designing a new car, the finite element analysis in CAE can be used to divide the car body structure into many tiny units, and then simulate the stress and strain of each unit when the vehicle is hit and subjected to different loads (such as bumps during normal driving, inertia force during sudden braking, etc.), accurately determine whether the body structure is strong enough, and which parts may have weak points, so as to optimize and improve the design in advance, and avoid discovering problems only after the actual manufacturing of the prototype car for collision testing, which will lead to a significant increase in costs and a longer R&D cycle.

[0038] 2. Displacement sensor: A displacement sensor is a device that converts the displacement of an object into a corresponding electrical signal or other easily processable signal. Common displacement sensors include capacitive displacement sensors. When an object is displaced, the capacitance between the two plates changes, and the displacement is determined by detecting the capacitance change. In an elevator control system, it is installed between the car and the guide rails to accurately measure the up and down displacement of the car and transmit the displacement information to the control system to ensure that the elevator can accurately stop at each floor, ensuring safe and smooth operation. It plays a key role in many scenarios that require accurate monitoring of position changes.

[0039] 3. Angle sensor: Angle sensors are mainly used to measure the rotation angle or angle change of an object. For example, a photoelectric encoder angle sensor has a code disk inside that rotates with the shaft. The photoelectric element detects the change in light passing through the gap of the code disk to generate a pulse signal, which is processed to obtain the angle value. At the joint of the robotic arm, the angle sensor monitors the rotation angle of the joint in real time and feeds the information back to the control system, so that the robotic arm can move accurately at the set angle and complete complex tasks such as grasping and assembly. It is an important component for accurately controlling rotational motion.

[0040] 4. Pressure sensor: Pressure sensors can sense pressure and convert its magnitude into output forms such as electrical signals. For example, piezoresistive pressure sensors measure pressure by changing its resistance when pressure acts on a silicon diaphragm. In the braking system of a car, the pressure sensor is installed in the pipeline to monitor the changes in brake fluid pressure and transmit the signal to the electronic control unit, allowing the vehicle to accurately control the braking force according to the driver's braking force to ensure the braking effect. It is indispensable in ensuring the safe and stable operation of equipment in many fields such as industry and medicine.

[0041] 5HMI: HMI, or human-machine interface, is an interface for transmitting and exchanging information between humans and machines. It displays the machine's operating status and data in an intuitive visual interface, and also receives human commands to control the machine. In an automated production workshop, the HMI touch screen on the console will display parameters such as equipment temperature and operating speed, so that workers can understand the equipment status and can also adjust the equipment operation mode by inputting commands through the touch screen, thus achieving efficient and convenient human-machine interaction and improving production efficiency and operation accuracy.

[0042] The present invention aims at solving the problems in the prior art and provides a method for verifying the load-bearing structure of a rear bumper. Figure 1 and Figure 6 As shown, the following steps are included: Step S0, establishing a three-dimensional model of the rear bumper and determining a number of target points; Step S1, uniformly applying a loading force from 0 N to a target point in the three-dimensional model of the rear bumper and uniformly unloading the loading force to 0 N to perform mechanical performance simulation, and record the simulated deformation in real time; The mechanical properties simulation is simulated by CAE; Step S2, fixing the rear bumper in a simulated real vehicle assembly posture; Step S3, uniformly applying a loading force from 0 N to a target point on the rear bumper at the same position as the three-dimensional model, and uniformly unloading the loading force to 0 N, and recording the measured deformation in real time; Step S4, calculate the safety factor K under the same loading force. The safety factor K is the ratio of the measured deformation variable to the simulated deformation variable. When 1≤K≤1.1, the test requirements are met, the test of this target point is completed, and the process jumps to step S5; when K>1.1, the test is interrupted, feedback is given that structural optimization is required, and the process jumps to step S0; when K<1, the simulated deformation variable is too large or the measured deformation variable is too small, feedback is given to perform simulation and rear bumper test, and parameters are adjusted and changed, and the process jumps to step S1 and then retests; In the three-dimensional model, material properties, structural design, etc. are all idealized values. The measured deformation will be greater than the deformation during the three-dimensional model simulation. When K is less than 1, it means that the measured deformation is smaller than the model deformation. At this time, it is necessary to troubleshoot the problem: the parameters refer to: temperature, humidity, material selection, loading force setting, loading force change rate, target point location and sensor. They need to be tested in the three-dimensional simulation model and in the actual measurement, and the corresponding parameters should be corrected and returned to S1 to re-measure the data; Step S5, determine whether there are still unmeasured target points. If there are still unmeasured target points, replace the next target point and jump to step S1; otherwise, end the test. Through the above method, the same process is used in each test process, and the test is carried out under the same conditions to improve the reference degree of the test results. At the same time, the actual test data is compared with the simulation data, and the difference is used to quickly determine whether the design of the rear bumper should be improved and optimized in the future.

[0043] The test environment conditions are: ambient temperature 23±5℃, ambient humidity 10%RH~95%RH.

[0044] The following table shows several working conditions and corresponding conditions and target value regulations used in this embodiment, simulating the load-bearing capacity of a person pedaling in a bicycle pedaling state. The loading forces in this embodiment are 980N and 1470N.

[0045]

[0046] In this embodiment, step S3 includes the following steps: Step S3-1, slowly and uniformly applying a loading force to a target point on the rear bumper at the same position as the three-dimensional model, and detecting the measured deformation in real time; Step S3-2: When the loading force reaches the preset value, maintain it for 1 hour and monitor the loading force value in real time; Step S3-3, unload the loading force to 0N, and detect the measured deformation in real time during the unloading process and within 1 hour after unloading. Applying the load slowly and evenly can avoid the influence of instantaneous impact on the test results, making the loading process closer to the actual working conditions; while maintaining the load force value for 1 hour and monitoring it in real time, the stability of the rear bumper under long-term stress can be observed; after unloading, the deformation is detected to accurately reflect the elastic recovery ability of the bumper. Combining these steps, the load-bearing and deformation characteristics of the rear bumper can be fully evaluated.

[0047] In this embodiment, in step S1, three target points are set, namely, point P1 located in the middle of the first-step pedal, points P2 and P3 located in the middle of the left and right sides of the second-step pedal. The above three target points are the key parts of the rear bumper where the force is concentrated in actual use. Targeted testing can accurately control the load-bearing performance of the bumper in key areas to ensure safe use.

[0048] In this embodiment, in step S2, the posture of the rear bumper is monitored during the process of simulating the actual vehicle assembly posture, and the deviation of the assembly angle of the rear bumper is ≤0.5° compared with the actual vehicle under the no-load state. This ensures that the test posture is highly consistent with the actual use, making the test data more valuable for reference and avoiding erroneous test conclusions due to differences in assembly posture.

[0049] The present application also provides a rear bumper load-bearing structure verification device, such as Figure 2-Figure 5 As shown, the method for implementing the above method includes a test bench 1 and a monitoring component, the monitoring component includes a displacement sensor 2, an angle sensor 3 and a pressure sensor 4, the displacement sensor 2 and the angle sensor 3 are used to detect the position and posture of the rear bumper 5, the pressure sensor 4 is used to detect the value of the loading force, the test bench 1 is provided with a tooling suspension beam and a loading component, the tooling suspension beam is used to install the rear bumper 5, the loading component includes a pressure unit 6, a cantilever 7 and a loading block 8, the lower end of the pressure unit 6 is arranged on the test bench 1, the upper end of the pressure unit 6 can reciprocate in the vertical direction, one end of the cantilever 7 is arranged at the upper end of the pressure unit 6, and the loading block 8 is fixedly arranged at the other end of the cantilever 7. By integrating the test bench 1 and the monitoring component including multiple sensors in the load-bearing structure verification device, the position, posture and loading force data of the rear bumper 5 can be collected in real time and accurately, the tooling suspension beam facilitates the standardized installation of the rear bumper 5, the loading component has a reasonable structure, and the pressure unit 6, the cantilever 7 and the loading block 8 can cooperate to flexibly apply the load, providing hardware guarantee for accurate measurement.

[0050] The loading block 8 is designed to simulate the foot, has a size of 90 mm×90 mm, a thickness of 20 mm, and is made of metal.

[0051] In this embodiment, a slide rail 9 is provided on the test bench 1, a mortise groove 10 is provided on the slide rail 9, a tenon 11 is provided at the bottom of the pressure unit 6, and the tenon 11 is movably arranged in the mortise groove 10. This mortise and tenon type movable connection structure not only ensures the smoothness of the horizontal movement of the pressure unit 6, facilitates the adjustment of the position according to different test requirements, but also has a certain positioning accuracy, thereby improving the usability and reliability of the entire test device.

[0052] In this embodiment, a mounting hole 12 is provided at the upper end of the pressure unit 6, and the cantilever 7 is movably provided in the mounting hole 12. The pressure unit 6 is also provided with a limiter 13, and the limiter 13 is used to fix the cantilever 7 in the mounting hole 12. Through the provided mounting hole 12 and the limiter 13, on the one hand, the cantilever 7 is convenient to install, and the extension length of the cantilever 7 can be flexibly adjusted as needed to change the loading position and direction; on the other hand, the limiter 13 can reliably fix the cantilever 7 during the test, ensure the stability of the loading process, and prevent the cantilever 7 from shaking and affecting the test accuracy.

[0053] In this embodiment, the pressure unit 6 is a hydraulic cylinder, and the pressure sensor 4 is disposed between the cantilever 7 and the loading block 8. The pressure sensor 4 is used to detect the pressure between the cantilever 7 and the loading block 8. The hydraulic cylinder is used as the pressure unit 6 to provide a stable and controllable loading force to meet the requirements of loading forces of different sizes; the pressure sensor 4 is disposed between the cantilever 7 and the loading block 8, which can directly and accurately measure the actual pressure applied to the rear bumper 5, reduce the measurement error in the force transmission process, and improve the test accuracy.

[0054] In this embodiment, a plurality of displacement sensors 2 are provided on the test bench 1, the lower end of the displacement sensor 2 is fixedly provided on the test bench 1, and the upper end of the displacement sensor 2 is in contact with the rear bumper 5 to be tested. The lower ends of the plurality of displacement sensors 2 are fixed to the test bench 1, and the upper ends are in contact with the rear bumper 5 to be tested, so that the displacement changes of the rear bumper 5 in the process of being subjected to force can be monitored in real time from multiple directions, and the deformation of the bumper can be captured in all directions, so as to provide detailed data support for analyzing its load-bearing capacity.

[0055] The present application also provides a rear bumper load-bearing structure verification system, including a rear bumper load-bearing structure verification device, and further comprising: Memory, used to store data from pressure sensors, displacement sensors, and angle sensors; the memory can fully store data from various sensors, making it easier to analyze and trace back later; A processor is used to calculate the safety factor K and the determination in step S4 and step S5; the processor automatically completes the complex safety factor calculation and test process determination, improves efficiency and reduces human errors; HMI, HMI is used to display the test environment, angle deviation, simulated deformation variables of simulation test, measured deformation variables, safety factor K, and the changing trends of simulated deformation variables and measured deformation variables; HMI intuitively displays all-round test information, including test environment, angle deviation, simulated and measured deformation variables and their changing trends, which is convenient for operators to control the test dynamics in real time and adjust the test strategy in time.

[0056] The controller is used to receive the data in the memory, the safety factor K of the processor, and the judgment result, and send the data to the HMI.

[0057] It is understandable that the systems, devices, modules or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, and the specific form of the computer can be a personal computer, a laptop computer, a personal digital assistant, a tablet computer, a wearable device, or a combination of any of these devices.

[0058] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0059] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0060] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0061] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0062] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0063] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0064] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0065] It should be understood that although the terms first, second, third, etc. may be used to describe various information in one or more embodiments of this specification, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0066] The above description is merely a preferred embodiment of one or more embodiments of the present specification and is not intended to limit one or more embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of protection of one or more embodiments of the present specification.

Claims

1. A method for verifying the load-bearing structure of a rear bumper, characterized in that: The following steps are involved: Step S0, establishing a three-dimensional model of the rear bumper and determining a number of target points; Step S1, uniformly applying a loading force from 0 N to a target point in the three-dimensional model of the rear bumper and uniformly unloading the loading force to 0 N to perform mechanical performance simulation, and record the simulated deformation in real time; Step S2, fixing the rear bumper in a simulated real vehicle assembly posture; Step S3, uniformly applying a loading force from 0 N to a target point on the rear bumper at the same position as the three-dimensional model, and uniformly unloading the loading force to 0 N, and recording the measured deformation in real time; Step S4, calculate the safety factor K under the same loading force. The safety factor K is the ratio of the measured deformation variable to the simulated deformation variable. When 1≤K≤1.1, the test requirements are met, the test of this target point is completed, and the process jumps to step S5; when K>1.1, the test is interrupted, feedback is given that structural optimization is required, and the process jumps to step S0; Step S5, determine whether there are still unmeasured target points. If there are still unmeasured target points, replace the next target point and jump to step S1; otherwise, end the test.

2. The load-bearing structure verification method of the rear bumper according to claim 1, characterized in that: Step S3 includes the following steps: Step S3-1, slowly and uniformly applying a loading force to a target point on the rear bumper at the same position as the three-dimensional model, and detecting the measured deformation in real time; Step S3-2: When the loading force reaches the preset value, maintain it for 1 hour and monitor the loading force value in real time; Step S3-3, unload the loading force to 0N, and detect the measured deformation in real time during the unloading process and within 1 hour after unloading.

3. The load-bearing structure verification method of the rear bumper according to claim 1, characterized in that: In step S1, three target points are set, namely point P1 located at the middle position of the first-step pedal, and points P2 and P3 located at the middle positions of the left and right sides of the second-step pedal.

4. The load-bearing structure verification method of the rear bumper according to claim 1, characterized in that: In step S2, the posture of the rear bumper is monitored during the process of simulating the actual vehicle assembly posture of the rear bumper, and the deviation of the assembly angle of the rear bumper is ≤0.5° compared with the actual vehicle assembly angle in the no-load state.

5. A rear bumper load-bearing structure verification device, used to implement the method described in any one of claims 1 to 4, characterized in that: The invention comprises an experimental bench (1) and a monitoring component, wherein the monitoring component comprises a displacement sensor (2), an angle sensor (3) and a pressure sensor (4), wherein the displacement sensor (2) and the angle sensor (3) are used to detect the position and posture of a rear bumper (5), and the pressure sensor (4) is used to detect the value of a loading force. A tooling suspension beam and a loading component are arranged on the experimental bench (1), wherein the tooling suspension beam is used to install the rear bumper (5), and the loading component comprises a pressure unit (6), a cantilever (7) and a loading block (8), wherein the lower end of the pressure unit (6) is arranged on the experimental bench (1), and the upper end of the pressure unit (6) can reciprocate in a vertical direction, one end of the cantilever (7) is arranged at the upper end of the pressure unit (6), and the loading block (8) is fixedly arranged at the other end of the cantilever (7).

6. The load-bearing structure verification device of the rear bumper according to claim 5, characterized in that: A slide rail (9) is provided on the experimental bench (1), a tenon groove (10) is provided on the slide rail (9), a tenon (11) is provided at the bottom of the pressure unit (6), and the tenon (11) is movably arranged in the tenon groove (10).

7. The load-bearing structure verification device of the rear bumper according to claim 6, characterized in that: The pressure unit (6) is provided with a mounting hole (12) at the upper end, and the cantilever (7) is movably arranged in the mounting hole (12). The pressure unit (6) is also provided with a limiting member (13), and the limiting member (13) is used to fix the cantilever (7) in the mounting hole (12).

8. The load-bearing structure verification device of the rear bumper according to claim 5, characterized in that: The pressure unit (6) is a hydraulic cylinder, and the pressure sensor (4) is arranged between the cantilever (7) and the loading block (8). The pressure sensor (4) is used to detect the pressure between the cantilever (7) and the loading block (8).

9. The load-bearing structure verification device of the rear bumper according to claim 5, characterized in that: A plurality of displacement sensors (2) are arranged on the test bench (1); the lower end of the displacement sensor (2) is fixedly arranged on the test bench (1), and the upper end of the displacement sensor (2) abuts against the rear bumper (5) to be tested.

10. A rear bumper load-bearing structure verification system, characterized in that: The load-bearing structure verification device including the rear bumper also includes: A memory, used for storing data of the pressure sensor, the displacement sensor and the angle sensor; A processor, used to calculate the safety factor K described in any one of claims 1 to 4 and the determination in step S4 and step S5; HMI, HMI is used to display the test environment, angle deviation, simulated deformation variables of simulation test, measured deformation variables, safety factor K, and the change trend of simulated deformation variables and measured deformation variables; The controller is used to receive the data in the memory, the safety factor K of the processor, and the judgment result, and send the data to the HMI.

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