A coupled simulation calculation method for verifying the strength of the door handle anti-collision clip

Abstract

The present invention relates to the field of automobile safety technology, and specifically provides a coupled simulation calculation method for verifying the strength of a door handle anti-collision clip: the door handle model in the whole vehicle model is removed, and the whole vehicle model after removal is regarded as a Global Model. The door handle is refinedly modeled, and the constructed door handle refined model is regarded as a Local Model. The Global Model and the Local Model are coupled to build a coupled model. The coupled model is coupled and calculated. This coupled simulation calculation method calculates a whole vehicle model with a large grid and a large time step without the door handle and the base, and a door handle model with a refined grid and a small time step, respectively, and couples the calculation results together in real time through contact and connection definitions during the calculation process, so as to obtain accurate calculation results with a suitable calculation time to verify the strength of the door handle anti-collision clip.

Description

Technical Field

[0001] The invention relates to the technical field of automobile safety, and in particular to a coupling simulation calculation method for verifying the strength of an anti-collision clip of a door handle. Background Art

[0002] In the vehicle high-speed side impact test, in order to prevent the door from opening accidentally and causing additional damage to the occupants in the vehicle, relevant regulations stipulate that the door cannot be opened during the collision. Figure 3 The anti-collision clip 1 of the vehicle door is a component designed to prevent the vehicle door from being opened accidentally during a collision. Its function is to prevent the vehicle door from being opened accidentally by preventing the excessive displacement of the door lock cable 6. During a vehicle collision, the anti-collision clip 1 will prevent the rotation of the handle rotation control member 2, thereby reducing the displacement of the door lock cable 6. Therefore, it is necessary to ensure the structural strength of the vehicle door anti-collision clip so that it can play a corresponding role.

[0003] Because the structure of the door handle and its base is complex and delicate, these parts are simplified in the usual vehicle collision simulation model. The simplified model cannot accurately reflect the movement and failure state of the anti-collision clip. In order to obtain the accurate movement and failure state of the anti-collision clip, it is necessary to make a refined model of the door handle and base, etc. Refined modeling means using smaller grids and smaller time steps for calculation, which leads to a significant increase in the calculation time of the vehicle collision simulation model.

[0004] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a coupled simulation calculation method for verifying the strength of the door handle anti-collision clip, which couples the whole vehicle model and the refined model of the door handle for calculation, and obtains accurate calculation results with appropriate calculation time to verify the strength of the door handle anti-collision clip.

[0006] The technical solution adopted by the present invention is:

[0007] A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip is provided, comprising the following steps:

[0008] S1: Remove the door handle model from the whole vehicle model, and the whole vehicle model after removal is regarded as the Global Model;

[0009] S2: Perform fine modeling on the door handle. The fine model of the door handle is regarded as the Local Model.

[0010] S3: Couple the Global Model and the Local Model to build a coupled model;

[0011] S4: Perform coupling calculation on the coupled model.

[0012] In some implementations, in step S1, removing the door handle model from the whole vehicle model specifically includes: removing the original door handle model and related contact and connection information from the whole vehicle model.

[0013] In some implementations, in step S2, the detailed modeling of the door handle specifically includes the following steps:

[0014] S21: performing detailed modeling on the main part of the door handle to form a main part model; the components in the main part include: an anti-collision clip, a handle rotation control member, a handle base, a handle, and a door lock cable;

[0015] S22: Modeling a torsion spring of a door handle to form a torsion spring model;

[0016] S23: The main body model of the door handle and the torsion spring model are fixedly connected.

[0017] In some embodiments, in step S21, the refined modeling of the main part of the door handle specifically includes: performing refined grid division on the main part, wherein the area of ​​the refined grid is smaller than the grid area of ​​the whole vehicle model.

[0018] In some implementations, in step S22, modeling the torsion spring of the door handle specifically includes:

[0019] S221: Divide the skin of the torsion spring in the form of a shell mesh;

[0020] S222: Use one-dimensional BEAM units and rigid body to connect the shell mesh to make it a flexible body, and assign the cross-sectional area, shear cross-sectional area, plane moment of inertia, and polar moment of inertia of the spring to the BEAM unit to make it have the characteristics of a spring body;

[0021] S223: Use a one-dimensional Spring Beam unit to set the spring elasticity. The two ends of the unit are connected to the cross bars at both ends of the torsion spring, and the unit coincides with the spring axis. The torsion spring torsional moment is given in the material properties of the one-dimensional Spring Beam unit.

[0022] In step S23, the main body model of the door handle and the torsion spring model are fixedly connected, specifically including: fixing the cross bars at both ends of the torsion spring in the torsion spring model to corresponding positions in the main body model.

[0023] In some implementations, in step S3, coupling the Global Model and the Local Model to build a coupling model specifically includes:

[0024] S31: Establish the contact between the components in the Local Model;

[0025] S32: Calculate the Local Model separately;

[0026] S33: Check whether penetration occurs between the components of the Local Model calculation results. If penetration occurs, reduce the time step and return to step S32 to recalculate. If no penetration occurs, proceed to step S34;

[0027] S34: Calculate the Global Model separately;

[0028] S35: If the Global Model can be calculated normally, execute step S36; otherwise, adjust the model and return to step S34 for recalculation;

[0029] S36: Establish contact and Tied connection between Local Model and Global Model to complete the coupling model construction.

[0030] In some embodiments, in step S4, the coupling calculation of the coupling model specifically includes: calling the coupling calculation function of the collision calculation software to perform coupling calculation on the coupling model, calculating the LocalModel with a time step Δt, and calculating the Global Model with a time step ΔT, where Δt<ΔT.

[0031] In some implementations, step S4 further includes the following steps:

[0032] S42: Check the failure mode of the anti-collision clip;

[0033] S43: Compare the calculation result with the door handle test result. If the results are consistent, the entire coupling simulation calculation is completed; if the results are inconsistent, adjust the calculation model parameters and return to step S41 to recalculate.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] The present invention uses a whole vehicle model and a refined door handle model to form a coupling model for calculation, and obtains accurate calculation results with a suitable calculation time to verify the strength of the door handle anti-collision clip. Coupling model: The whole vehicle model with a large grid and a large time step without the door handle and the base and the door handle model with a refined grid and a small time step are calculated separately, and the calculation results are coupled together in real time through contact and connection definitions during the calculation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flow chart showing a coupled simulation calculation method according to an embodiment of the present invention;

[0038] Figure 2 A schematic diagram showing a complete vehicle model with a door handle model removed according to an embodiment of the present invention;

[0039] Figure 3 A schematic diagram showing the position of the components of the door handle during a collision is shown;

[0040] Figure 4 A flowchart showing modeling of a torsion spring of a door handle according to an embodiment of the present invention;

[0041] Figure 5 A schematic diagram showing a torsion spring model according to an embodiment of the present invention;

[0042] Figure 6 A flowchart showing coupling of a Global Model and a Local Model according to an embodiment of the present invention is shown;

[0043] Figure 7 A flow chart of coupling calculation and experimental simulation benchmarking of a coupling model according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0044] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0045] refer to Figure 1 This embodiment provides a coupled simulation calculation method for verifying the strength of a door handle anti-collision clip, comprising the following steps:

[0046] S1: Remove the door handle model from the whole vehicle model, and the whole vehicle model after removal is regarded as the Global Model;

[0047] S2: Perform fine modeling on the door handle. The fine model of the door handle is regarded as the Local Model.

[0048] S3: Couple the Global Model and the Local Model to build a coupled model;

[0049] S4: Perform coupling calculation on the coupled model.

[0050] In step S1, the original door handle model and its related contact and connection information are removed from the vehicle model. Figure 2 , Figure 2 The whole vehicle model with the door handle model removed in this embodiment is shown. The whole vehicle model after the removal is regarded as the Global Model.

[0051] In step S2, refer to Figure 3 The parts of the door handle model that need to be refined include: anti-collision clip 1, handle rotation control 2, handle base 3, handle 4, torsion spring 5 and door lock cable 6. Modeling includes the following subdivision steps:

[0052] S21: Perform fine modeling on the main part of the door handle to form a main part model. The main part of the door handle includes: an anti-collision clip 1, a handle rotation control member 2, a handle base 3, a handle 4 and a door lock cable 6. In this embodiment, the fine grid size is set to one fifth of the whole vehicle model, that is, 1 mm, and all the grid models except the torsion spring 5 are built with solid units.

[0053] S22: Model the torsion spring of the door handle to form a torsion spring model. Figure 4 .

[0054] S221: Spring skin meshing - Shell meshing: Mesh the spring skin in the form of shell meshing.

[0055] S222: Spring Solid Characterization: Reference Figure 5 , use one-dimensional BEAM unit 3 and rigid body 4 to connect the shell mesh to make it a flexible body, and change the cross-sectional area of ​​spring 1 Shear cross-sectional area , plane moment of inertia , polar moment of inertia , assigned to the BEAM unit so that it has the characteristics of a spring body; where d is the diameter of the spring and R is the radius of the spring.

[0056] S223: Spring elasticity characterization: reference Figure 5, use the one-dimensional Spring Beam unit 2 to set the spring elasticity, the two ends of the unit are connected to the two ends of the torsion spring crossbar 5, and the unit coincides with the spring axis. The torsion spring torque is given to the material properties of the unit.

[0057] S23: Reference Figure 5 , the cross bars 5 at both ends of the torsion spring in the torsion spring model are fixedly connected to the relevant parts in the main body model.

[0058] Step S3: Build the coupling model. Figure 6 , the specific steps of building the coupling model are as follows:

[0059] S31: Establish the contact between the components in the Local Model;

[0060] S32: Calculate the Local Model separately;

[0061] S33: Check whether penetration occurs between the components of the Local Model calculation results. If penetration occurs, reduce the time step and return to step S32 to recalculate. If no penetration occurs, proceed to step S34;

[0062] S34: Calculate the Global Model separately;

[0063] S35: If the Global Model can be calculated normally, execute step S36; otherwise, adjust the model and return to step S34 for recalculation;

[0064] S36: Establish contact and Tied connection between Local Model and Global Model to complete the coupling model construction.

[0065] Step S4: Coupled model simulation calculation. Figure 7 , the specific process of coupled model simulation calculation is as follows:

[0066] S41: Call the coupling calculation function of the collision calculation software (PAM-CRASH) to perform model calculation. In this embodiment, the Local Model is calculated with a time step of Δt, and the Global Model is calculated with a time step of ΔT, Δt<ΔT. During the calculation process of the two models, the calculation results of each other are continuously affected by contact and connection, forming a coupling calculation to complete the calculation;

[0067] S42: Check the failure mode of the door anti-collision clip;

[0068] S43: Compare the calculation result with the test result. If the results are consistent, proceed to the next step. Otherwise, adjust the calculation model parameters and return to S41 for recalculation.

[0069] S44: Complete the coupling simulation calculation.

[0070] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive to the present invention. Any equivalent transformation and improvement based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip, characterized in that: The steps include: S1: Remove the door handle model from the whole vehicle model, and the whole vehicle model after removal is regarded as the Global Model; S2: Perform fine modeling on the door handle. The fine model of the door handle is regarded as the Local Model. S3: Couple the Global Model and the Local Model to build a coupled model; S4: Perform coupling calculation on the coupled model.

2. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 1, characterized in that: In step S1, removing the door handle model from the whole vehicle model specifically includes: removing the original door handle model and related contact and connection information from the whole vehicle model.

3. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 1, characterized in that: In step S2, the detailed modeling of the door handle specifically includes the following steps: S21: performing detailed modeling on the main part of the door handle to form a main part model; the components in the main part include: an anti-collision clip, a handle rotation control member, a handle base, a handle, and a door lock cable; S22: Modeling a torsion spring of a door handle to form a torsion spring model; S23: The main body model of the door handle and the torsion spring model are fixedly connected.

4. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 3, characterized in that: In step S21, the refined modeling of the main part of the door handle specifically includes: performing refined grid division on the main part, wherein the area of ​​the refined grid is smaller than the grid area of ​​the whole vehicle model.

5. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 4, characterized in that: In step S22, the torsion spring of the door handle is modeled, specifically including: S221: Divide the skin of the torsion spring in the form of a shell mesh; S222: Use one-dimensional BEAM units and rigid body to connect the shell mesh to make it a flexible body, and assign the cross-sectional area, shear cross-sectional area, plane moment of inertia, and polar moment of inertia of the spring to the BEAM unit to make it have the characteristics of a spring body; S223: Use a one-dimensional Spring Beam unit to set the spring elasticity. The two ends of the unit are connected to the cross bars at both ends of the torsion spring, and the unit coincides with the spring axis. The torsion spring torsional moment is given in the material properties of the one-dimensional Spring Beam unit. In step S23, the main body model of the door handle and the torsion spring model are fixedly connected, specifically including: fixing the cross bars at both ends of the torsion spring in the torsion spring model to corresponding positions in the main body model.

6. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 1, characterized in that: In step S3, coupling the Global Model and the Local Model to build a coupling model specifically includes: S31: Establish the contact between the components in the Local Model; S32: Calculate the Local Model separately; S33: Check whether penetration occurs between the components of the Local Model calculation results. If penetration occurs, reduce the time step and return to step S32 to recalculate. If no penetration occurs, proceed to step S34; S34: Calculate the Global Model separately; S35: If the Global Model can be calculated normally, execute step S36; otherwise, adjust the model and return to step S34 for recalculation; S36: Establish contact and Tied connection between Local Model and Global Model to complete the coupling model construction.

7. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 1, characterized in that: In step S4, the coupling calculation of the coupling model specifically includes: S41: Call the coupling calculation function of the collision calculation software to perform coupling calculation on the coupling model, calculate the Local Model with a time step of Δt, and calculate the Global Model with a time step of ΔT, where Δt<ΔT.

8. A coupled simulation calculation method for verifying the strength of a door handle anti-collision clip as claimed in claim 7, characterized in that: Step S4 also includes the following steps: S42: Check the failure mode of the anti-collision clip; S43: Compare the calculation result with the door handle test result. If the results are consistent, the entire coupling simulation calculation is completed. If the results are inconsistent, adjust the calculation model parameters and return to step S41 to recalculate.

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