CN114925563A - Simulation calculation method and system for limit load of key part of vehicle door opening and closing system - Google Patents
Simulation calculation method and system for limit load of key part of vehicle door opening and closing system Download PDFInfo
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Abstract
The invention discloses a simulation calculation method and a simulation calculation system for critical component ultimate load of a vehicle door opening and closing system. The limit load of the key parts of the vehicle door opening and closing system under four working conditions specified in GB15086-2019 can be calculated with high precision in the design process of the vehicle door, the static tension test in the design process of the key parts of the vehicle door opening and closing system is replaced, and the development process is shortened.
Description
Technical Field
The invention relates to the technical field of automobile design, in particular to a simulation calculation method for limit load of key parts of a vehicle door opening and closing system.
Background
The automobile door lock is a key component of an automobile door opening and closing system, and the bearing performance of the automobile door lock is directly related to the safety of a driver and passengers during vehicle running and accidents. The locking mechanism is a core component of the automobile door lock and comprises a clamping plate, a clamping jaw, a riveting shaft, a bottom plate and other parts. In the closed state of the door, the load applied to the door is almost completely received by the door lock latch mechanism. Therefore, the bearing capacity of the automobile door lock is an important index for evaluating the performance of key parts of the automobile door opening and closing system. The performance requirements and test methods of automobile door locks are clearly specified in all countries and regions of the world.
At present, the forward development process of the automobile door lock is to design a sample according to the industry standard, the functional requirement and the experience of a designer and then verify the comprehensive performance of the product through various tests. The main defects of the limit load of the automobile door lock are long time consumption and large investment by testing verification. Design cost can be greatly reduced by means of CAE method instead of experiment. However, when the door lock body is in a state close to the limit load, the nonlinearity degree of the calculation process is very high, and the solution by directly using the implicit method is difficult. If an explicit method is used for solving, the problem of long time consumption exists.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the design and manufacturing process of key parts of a vehicle door opening and closing system effectively calculate and verify the ultimate load of the key parts of the vehicle door opening and closing system at the sample stage, so that the later-stage load test period is long and the cost is high, and provides a simulation calculation method and a simulation calculation system for the ultimate load of the key parts of the vehicle door opening and closing system, which can calculate the ultimate load of the key parts of the vehicle door opening and closing system under four working conditions specified in GB15086-2019 with higher precision in the design process of the vehicle door, replace the static tensile test in the design process of the key parts of the vehicle door opening and closing system, shorten the development process of the key parts of the vehicle door opening and closing system, and provide a theoretical basis for the design and research of the key parts of the vehicle door opening and closing system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a simulation calculation method for critical load of key parts of a vehicle door opening and closing system is characterized by comprising the following steps:
s1: selecting the space dimension and simulation environment of the critical part extreme load of the vehicle door opening and closing system in modeling software;
s2: modeling according to the actual size of the key part of the vehicle door opening and closing system to form a geometric model of the key part of the vehicle door opening and closing system;
s3: importing the established geometric model into finite element analysis software, and defining a material model and material attributes of metal materials of each part in key parts of the vehicle door opening and closing system;
s4: setting boundary conditions and load conditions of key parts of the door opening and closing system under different working conditions in the selected simulation environment;
s5: carrying out grid division on a key part geometric model of a vehicle door opening and closing system;
s6: guiding the geometric model divided with the grids into a finite element solver, and setting the solver and solver parameters
S7: based on the set boundary conditions and a plastic collapse load method, carrying out simulation solution on the critical load of the key parts of the vehicle door opening and closing system, adjusting the time step in the simulation process, and judging the size of the critical load of the key parts of the vehicle door opening and closing system according to the time of non-convergence prompt information; if the simulation can be converged all the time, changing the magnitude of the applied external load, and repeating the steps S4 to S6;
s8: the mechanical properties of key parts of the vehicle door opening and closing system are evaluated by comparing the calculation result with the specified limit load, and if the calculated limit load is higher than the specified limit load, the designed locking mechanism can be determined to be qualified; if the calculated limit load is lower than the specified limit load, repeating the steps from S1 to S7 to continuously optimize the lock body structure; the specified limit load is a limit load value under four working conditions specified by the national standard GB 15086-2019.
In the above technical solution, the key components of the vehicle door opening and closing system include a snap plate, a jaw, a bottom plate, an auxiliary bottom plate, a snap plate rivet shaft, and a jaw rivet shaft in the vehicle door lock locking mechanism, and a geometric model of each key component is correspondingly established in step S2.
In the above technical solution, the modeling software in step S1 is SolidWorks three-dimensional modeling software; the finite element analysis software in step S3 is ANSYS Workbench.
In the above technical solution, the spatial dimension in step S1 is three-dimensional, and the simulation environment includes a static structure analysis module.
In the above technical solution, in step S3, the material model is a component material of each part in key components of the vehicle door opening and closing system, the material of the chuck plate and the jaw is 35CrMo, the material of the bottom plate and the auxiliary bottom plate is 440DP, and the material of the chuck plate rivet shaft and the jaw rivet shaft is 10B 21; the material properties refer to the Young modulus, the tangent modulus, the yield strength and the Poisson ratio of the material.
In step S3, the material is a component material of each part in the automobile door lock locking mechanism, the mechanical model for calculating the material stress is a bilinear isotropic strengthening model, and is calculated by using the following formula:
wherein E is Young's modulus, ε is strain, σ s Is the yield strength,. epsilon s To yield strain, E tg Is the tangent modulus. The tangent modulus is calculated using the following formula:
in the formula, σ b The tensile strength, δ is the elongation.
In the above technical solution, the boundary conditions in step S4 include a force boundary condition and a displacement constraint boundary condition; the force boundary conditions include applying a force load to the contact area of the pawl and the shackle that is twice the force load required by GB15086-2019 in each direction; the displacement constraint boundary conditions comprise fixed constraint of a clamping plate riveting shaft and a clamping jaw riveting shaft, coaxial constraint between the clamping plate and the clamping plate riveting shaft, coaxial constraint between the clamping jaw and the clamping jaw riveting shaft, and frictional contact between the clamping plate and the clamping jaw.
Specifically, in step S4, a "fixed support" is selected from the "supports" and both ends of two rivet shafts are selected, and the two rivet shafts are set to be fixedly constrained; selecting a 'revolute joint' from the 'joints', setting coaxial constraint between the inner side of the through hole of the clamping plate and the riveting shaft of the clamping plate, and setting coaxial constraint between the inner side of the through hole of the clamping jaw and the riveting shaft of the clamping jaw; selecting a load mode as 'force', applying a force load which is twice as much as that required by GB15086-2019 on a contact area between the lock catch and the clamping plate, wherein the load application mode is linearly increased along with time; selecting "frictional connection" in "connection", frictional contact is provided in the contact area between the catch plate and the pawl.
In the above technical solution, in step S5, the chuck plate and the jaw part are divided into hexahedron/triangular prism units, and the other complex parts with curved surfaces except for the chuck plate and the jaw part are divided into tetrahedron units.
In the above technical solution, the solver is set as an implicit solver PCG in step S6, and a static structure analysis module is selected as a solver parameter; time sub-step control is adopted.
In the technical scheme, in the step S7, a force load which is linearly increased along with time is applied to a jaw in the automobile door lock locking mechanism, and when the solving process cannot be converged, the current load value is regarded as the limit load of the locking mechanism; if the solving process can be converged, the limit load is larger than the load value applied in the simulation process, and the load boundary condition needs to be reset.
In step S7, the limit load of the key component of the door opening/closing system is calculated by using the plastic collapse load method. The principle is that the ultimate load is a load which causes instability of the overall structure, and the ultimate load is expressed in that the structure cannot obtain a balance solution for small load increment. When the weakest point in the door lock structure of the automobile cannot effectively bear the load because of plastic deformation, the point fails and the overall rigidity of the lock mechanism is reduced. But the other parts of the locking mechanism can still bear loads continuously, including the loads transferred from the failure parts. The internal forces of the structure are redistributed. Therefore, the lock body can still continue to bear the weight of. As more and more parts are plastically deformed, the locking mechanism eventually cannot continue to bear. At this time, the rigidity of the lock mechanism is sharply reduced, the deformation is sharply increased, and the lock mechanism is broken. The magnitude of the external load applied to the locking mechanism at the moment is the limit load of the locking mechanism.
In the step S7, the limit load of the door lock body under four conditions in the requirements of GB15086-2019 is determined using a plastic collapse load method. Specifically, by setting a time step control parameter, the time step is continuously divided into two at the moment of non-convergence in the simulation process, and when the solving time step is less than the set minimum time step, the simulation calculation process is diverged. And (3) performing simulation calculation on the external load corresponding to the divergence time, namely the limit load of the key part of the vehicle door opening and closing system.
Based on the method, the invention also provides a simulation calculation system for the limit load of the key parts of the vehicle door opening and closing system, which is characterized by comprising the following steps:
the modeling unit is used for modeling according to the space dimension and the simulation environment and the actual size of the key part of the vehicle door opening and closing system to form a geometric model of the key part of the vehicle door opening and closing system;
the simulation calculation unit is used for importing the established geometric model into finite element analysis software, and setting a material model, material properties, boundary conditions and load conditions of metal materials of each part; carrying out mesh division on a geometric model of key parts of the vehicle door opening and closing system;
a finite element solving unit: the finite element solver is used for importing the geometric model divided with the grids into the finite element solver, and the solver parameters are set at the root; based on the set boundary conditions and a plastic collapse load method, carrying out simulation solution on the critical load of the key parts of the vehicle door opening and closing system, adjusting the time step length in the simulation process to carry out optimization, and judging the size of the critical load of the key parts of the vehicle door opening and closing system according to the time of occurrence of the unconverged prompt information; and (3) evaluating the mechanical properties of key parts of the vehicle door opening and closing system by comparing the calculation result with the specified limit load, and performing iterative optimization until the calculated limit load is higher than the specified limit load.
Therefore, the limit load of the automobile door lock under four working conditions specified in GB15086-2019 is obtained through simulation calculation by establishing a finite element model of key parts of the automobile door opening and closing system and using static structure analysis on the key parts of the automobile door opening and closing system. In step S6, specifically, when a solver parameter of the simulation calculation is set and the limit load simulation calculation of the key component of the vehicle door opening and closing system is performed, a "static structure analysis" simulation module is preferably used, and a solver is preferably a PCG. By setting a proper simulation time step strategy, when iteration of the simulation process is gradually carried out, the simulation time step is gradually reduced. When the simulation time step length is smaller than the minimum time step length set by simulation, the solving process diverges, and the simulation result has the related prompt of non-convergence. By excluding other errors caused by improper arrangement, the limit load value of the key part of the vehicle door opening and closing system can be calculated through the time when the result is not converged.
The invention has the following beneficial effects:
the invention calculates the limit load of key parts of the vehicle door opening and closing system under four working conditions based on a finite element method under the requirement of GB 15086-2019. The method comprises the steps of giving a three-dimensional structure, a working condition mode, mechanical and geometric boundary conditions and load conditions of key parts of the vehicle door opening and closing system, analyzing stress distribution conditions of a door lock mechanism in the vehicle door opening and closing system under load conditions of transverse full locking, longitudinal full locking, transverse half locking and longitudinal half locking, and compared with a static tension test, the method can calculate the limit load of the key parts of the vehicle door opening and closing system under four working conditions under the GB15086-2019 requirement more quickly, provides a basis for solving a limit load problem, and provides a basis for research and design of the key parts of the vehicle door opening and closing system.
Meanwhile, the method carries out complex calculation based on a computer, the calculation method is high in precision and less in time consumption, and the calculation efficiency is improved.
The invention uses a finite element calculation method of the limit load of the automobile door lock based on an elastic-plastic model and a plastic load collapse method. The strong non-linear problem of the automobile door lock after the extreme state does not need to be solved directly, and the extreme load value of the automobile door lock can be obtained quickly. The method can replace a static tension test in the design process of the automobile door lock, shorten the design flow and the design period of the automobile door lock, and reduce the design cost of key parts of an automobile door opening and closing system.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a schematic structural diagram of key parts of the door opening and closing system of the present invention;
FIG. 3 is a finite element model of key parts of the door opening and closing system of the present invention.
In the figure, 1 bottom plate, 2 clamping plates, 3 clamping plate riveting shafts, 4 auxiliary bottom plates, 5 jaw riveting shafts and 6 jaws are arranged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment shown in fig. 1, it can be seen that the method for calculating the limit load of the key components of the vehicle door opening and closing system shown in fig. 2 includes the following steps: firstly, selecting and calculating the space dimension and the simulation environment of the limit load of the automobile door lock; secondly, establishing a geometric model of key parts of the vehicle door opening and closing system; thirdly, defining an elastic-plastic model and corresponding parameters of metal materials of all parts of key parts of the vehicle door opening and closing system; fourthly, setting boundary conditions for solving the limit load in the selected simulation environment; fifthly, carrying out grid division on a geometric model of key parts of the vehicle door opening and closing system; sixthly, setting a solver and solver parameters; step seven, solving the limit load of the key parts of the vehicle door opening and closing system by using a plastic collapse load method, judging the limit load of the key parts of the vehicle door opening and closing system according to the time of non-convergence prompt, changing the size of an applied external load if the simulation can be converged all the time, and repeating the fourth step to the sixth step; and eighthly, evaluating the mechanical properties of key parts of the vehicle door opening and closing system by comparing the calculation result with the national standard, and repeating the first step to the seventh step if the obtained limit load is smaller than the national standard.
The invention provides a critical component ultimate load simulation calculation method of a vehicle door opening and closing system, which comprises the following steps of firstly, carrying out three-dimensional modeling in three-dimensional modeling software according to the actual size of the critical component of the vehicle door opening and closing system to form a three-dimensional model (a geometric model is shown as a figure 3) of the critical component of the vehicle door opening and closing system, wherein the three-dimensional modeling software is preferably SolidWorks; secondly, importing the established three-dimensional model into proper finite element analysis software, wherein the software is preferably ANSYS Workbench finite element analysis software; defining material models and material parameters of materials of parts in key parts of the vehicle door opening and closing system, and defining boundary conditions and load conditions of the key parts of the vehicle door opening and closing system under different working conditions; carrying out mesh division on a geometric model of key parts of the vehicle door opening and closing system; and finally, introducing the geometric model divided with the grids into a finite element solver, and calculating limit load values of key parts of the vehicle door opening and closing system under four working conditions according to GB15086-2019 requirements based on the set boundary conditions and a plastic collapse load method. The method has the advantages that the limit load of the key parts of the vehicle door opening and closing system is judged according to the time of occurrence of unconverged information in simulation software, the calculation of the limit load of the vehicle door lock with high nonlinearity degree in the solving process is very flexible and simple, the limit load of the key parts of the vehicle door opening and closing system under different types and different working conditions can be obtained, the failure forms and failure types of the key parts of the vehicle door opening and closing system under the limit load can be directly reflected through a cloud chart of a simulation result, a basis is provided for solving the problem of the limit load, and a basis is provided for design research of the key parts of the vehicle door opening and closing system.
GB15086-2019 stipulates that the limit load of key parts of the lower door opening and closing system under various working conditions (totally four working conditions) is as the following table 1:
TABLE 1
| Locked state | Longitudinal load (N) | Longitudinal load (N) |
| Full locked state | 11110 | 8890 |
| Semi-locked state | 4440 | 4440 |
Taking transverse load of key parts of the vehicle door opening and closing system in a full locking state as an example, the limit load of the key parts of the vehicle door opening and closing system needs 11110N meeting the requirements in the national standard, establishing a corresponding finite element model of the key parts of the vehicle door opening and closing system, setting relevant parameters, applying external load according to a linear function until no convergence occurs in simulation, and determining the size of the external load as the limit load of the key parts of the vehicle door opening and closing system. In order to verify the accuracy of the simulation method, the transverse load of a key part of a certain vehicle door opening and closing system in a full locking state is selected as an example for simulation design calculation, and the material used by each part of the locking mechanism is compared with the static tension test result of the locking mechanism as shown in the following table 2:
TABLE 2
| Details of | Card board | Jack catch | Cardboard riveting shaft | Jack catch rivet shaft | Base plate | Auxiliary bottom plate |
| Material | 35CrMo | 35CrMo | 440DP | 440DP | 10B21 | 10B21 |
The position state of the lock mechanism is a full lock state.
The first step is as follows: selecting and calculating space dimension and simulation environment of key parts of vehicle door opening and closing system
The spatial dimension in the simulation calculation process is selected to be three-dimensional, and the selected simulation environment is static structure analysis.
The second step is that: establishing geometric model of key parts of vehicle door opening and closing system
A geometric structure model of the locking mechanism is established according to the actual size structure of the locking mechanism, the model comprises a clamping plate 1, a clamping plate riveting shaft 2, an auxiliary bottom plate 3, clamping jaws 4, clamping jaw riveting shafts 5 and a bottom plate 6, and the structure of the model is shown in figure 2.
The third step: the material properties of the locking mechanism are defined according to the materials used for the parts, and the materials include 35CrMo, 440DP and 10B 21. See table 3.
TABLE 3
| Material | Young's modulus (MPa) | Tangent modulus (MPa) | Yield strength (MPa) | Poisson ratio |
| 35CrMo | 210000 | 1260 | 835 | 0.286 |
| 440DP | 207000 | 620 | 440 | 0.3 |
| 10B21 | 200000 | 1200 | 380 | 0.28 |
The fourth step: setting corresponding boundary condition and load condition in simulation model
A: and selecting a clamping plate riveting shaft and two ends of the clamping plate riveting shaft as the whole fixed constraint condition of key parts of the vehicle door opening and closing system. Because locking mechanism passes through the riveting axle to be connected with the lock body, select "fixed support" and select the both ends of two riveting axles in "support", set up fixed constraint with two riveting axles.
B: and selecting a revolute joint from the joints, setting coaxial constraint between the inner side of the clamp plate through hole and the clamp plate rivet shaft, and setting coaxial constraint between the inner side of the jaw through hole and the jaw rivet shaft. The load pattern was chosen to be "force" and a force load of 22000N was applied at the contact area of the latch and the card plate in a manner that increased linearly with time. Selecting "frictional connection" in "connection", frictional contact is provided in the contact area between the catch plate and the pawl.
The fifth step: grid division is carried out on key part geometric model of vehicle door opening and closing system
In order to obtain a more accurate solution result, the meshing process is controlled by a meshing method and the size of the mesh. Since the extreme load analysis is a material nonlinearity problem and has a certain requirement on the grid division quality, the global grid size is set to be 1mm in the embodiment. Parts such as clamping plates and clamping jaws with regular structures in the locking mechanism are divided by using hexahedron/triangular prism units. And tetrahedral unit division is used for other complex parts with curved surfaces.
Sixthly, setting solver and solver parameters
And selecting a solving module as 'static structure analysis', and setting an implicit solver, wherein the solver is preferably a PCG. And setting a step length control method and control parameters in the simulation analysis process. The step size control method is preferably time sub-step control, and for the initial step size, the initial step size can be increased appropriately to accelerate the solving speed; for the minimum step size, a smaller value should be set to ensure the solution accuracy.
And seventhly, solving the limit load of the key parts of the vehicle door opening and closing system by using a plastic collapse load method, and judging the limit load of the key parts of the vehicle door opening and closing system according to the time of non-convergence prompt.
And applying a force load linearly increasing with time to a jaw in the automobile door lock locking mechanism, and when the solving process cannot be converged, taking the load value at the moment as the limit load of the locking mechanism. If the solving process can be converged, the limit load is larger than the load value applied in the simulation process, and the load boundary condition needs to be reset. Compared with the static tensile test result, the limit load of the key parts of the vehicle door opening and closing system is very close.
Eighthly, evaluating the mechanical properties of key parts of the vehicle door opening and closing system by comparing the calculation result with the national standard
And comparing the limit load of the key parts of the vehicle door opening and closing system obtained by simulation calculation with the limit load value specified in GB 15086-2019. If the calculated limit load is higher than the specified limit load, the designed locking mechanism can be determined to be qualified; if the calculated limit load is lower than the specified limit load, the lock body structure needs to be continuously optimized.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A simulation calculation method for limit load of key parts of a vehicle door opening and closing system is characterized by comprising the following steps:
s1: selecting the space dimension and simulation environment of the critical part extreme load of the vehicle door opening and closing system in modeling software;
s2: modeling according to the actual size of the key part of the vehicle door opening and closing system to form a geometric model of the key part of the vehicle door opening and closing system;
s3: importing the established geometric model into finite element analysis software, and defining a material model and material attributes of metal materials of each part in key parts of the vehicle door opening and closing system;
s4: setting boundary conditions and load conditions of key parts of the door opening and closing system under different working conditions in the selected simulation environment;
s5: carrying out mesh division on a geometric model of key parts of the vehicle door opening and closing system;
s6: guiding the geometric model divided with the grids into a finite element solver, and setting parameters of the solver and the solver;
s7: based on the set boundary conditions and a plastic collapse load method, carrying out simulation solution on the critical load of the key parts of the vehicle door opening and closing system, adjusting the time step length in the simulation process, and judging the size of the critical load of the key parts of the vehicle door opening and closing system according to the time of occurrence of the unconverged prompt information; if the simulation can be converged all the time, changing the magnitude of the applied external load, and repeating the steps S4 to S6;
s8: the mechanical properties of key parts of the vehicle door opening and closing system are evaluated by comparing the calculation result with the specified limit load, and if the calculated limit load is higher than the specified limit load, the designed locking mechanism can be determined to be qualified; if the calculated limit load is lower than the specified limit load, repeating the steps from S1 to S7 to continuously optimize the lock body structure; the specified limit load is the limit load value under four working conditions specified by the national standard GB 15086-2019.
2. The method for simulating and calculating the ultimate load of the key component of the vehicle door opening and closing system according to claim 1, wherein the key component of the vehicle door opening and closing system comprises a snap plate, a snap claw, a bottom plate, an auxiliary bottom plate, a snap plate riveting shaft and a snap claw riveting shaft in a locking mechanism of a vehicle door lock, and a geometric model of each key component is correspondingly established in step S2.
3. The simulation calculation method for the ultimate load of the key part of the vehicle door opening and closing system according to claim 1, wherein the modeling software in the step S1 is SolidWorks three-dimensional modeling software; the finite element analysis software in step S3 is ANSYS Workbench.
4. The simulation calculation method for the limit load of the key component of the vehicle door opening and closing system according to claim 1, wherein the spatial dimension is three-dimensional in step S1, and the simulation environment comprises a static structure analysis module.
5. The method for calculating the critical load of the key component of the vehicle door opening and closing system according to claim 1, wherein in step S3, the material model is the material of each component of the key component of the vehicle door opening and closing system, the material of the chuck plate and the jaw is 35CrMo, the material of the bottom plate and the auxiliary bottom plate is 440DP, and the material of the rivet shaft of the chuck plate and the rivet shaft of the jaw is 10B 21; the material properties refer to the Young modulus, the tangent modulus, the yield strength and the Poisson ratio of the material.
6. The simulation calculation method for the limit load of the key component of the vehicle door opening and closing system according to claim 1, wherein the boundary conditions in step S4 include force boundary conditions and displacement constraint boundary conditions; the force boundary conditions include applying a force load to the contact area of the pawl and the shackle that is twice the force load required by GB15086-2019 in each direction; the displacement constraint boundary conditions comprise fixed constraint of a clamping plate riveting shaft and a clamping jaw riveting shaft, coaxial constraint between the clamping plate and the clamping plate riveting shaft, coaxial constraint between the clamping jaw and the clamping jaw riveting shaft, and frictional contact between the clamping plate and the clamping jaw.
7. The simulation calculation method for limit load of key parts of vehicle door opening and closing system according to claim 1, wherein in step S5, hexahedron/triangular prism unit division is used for the chuck plate and jaw parts, and tetrahedron unit division is used for other complex parts with curved surface except for the chuck plate and jaw parts.
8. The simulation calculation method for the limit load of the key part of the vehicle door opening and closing system according to claim 1, wherein a solver is set as an implicit solver PCG in step S6, and parameters of the solver are selected as a static structure analysis module; time sub-step control is adopted.
9. The simulation calculation method for the limit load of the key component of the vehicle door opening and closing system according to claim 1, wherein in step S7, a force load which linearly increases with time is applied to a pawl in a locking mechanism of a vehicle door lock, and when the solution process cannot be converged, the load value at that moment is regarded as the limit load of the locking mechanism; if the solving process can be converged, the limit load is larger than the load value applied in the simulation process, and the load boundary condition needs to be reset.
10. A simulation calculation system for limit load of key parts of a vehicle door opening and closing system is characterized by comprising the following components:
the modeling unit is used for modeling according to the space dimension and the simulation environment and the actual size of the key part of the vehicle door opening and closing system to form a geometric model of the key part of the vehicle door opening and closing system;
the simulation calculation unit is used for importing the established geometric model into finite element analysis software, and setting a material model, material properties, boundary conditions and load conditions of the metal materials of each part; carrying out mesh division on a geometric model of key parts of the vehicle door opening and closing system;
a finite element solving unit: the solver and solver parameters are set for leading the geometric model divided with the grids into a finite element solver and for the finite element solver; based on the set boundary conditions and a plastic collapse load method, carrying out simulation solution on the critical load of the key parts of the vehicle door opening and closing system, adjusting the time step length in the simulation process to carry out optimization, and judging the size of the critical load of the key parts of the vehicle door opening and closing system according to the time of occurrence of the unconverged prompt information; and (3) evaluating the mechanical properties of key parts of the vehicle door opening and closing system by comparing the calculation result with the specified limit load, and performing iterative optimization until the calculated limit load is higher than the specified limit load.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116910924A (en) * | 2023-09-13 | 2023-10-20 | 天津龙创世纪汽车设计有限公司 | Quick analysis method based on strength of car door trim card seat |
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| CN116910924A (en) * | 2023-09-13 | 2023-10-20 | 天津龙创世纪汽车设计有限公司 | Quick analysis method based on strength of car door trim card seat |
| CN116910924B (en) * | 2023-09-13 | 2024-01-19 | 天津龙创世纪汽车设计有限公司 | Quick analysis method based on strength of car door trim card seat |
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