A durability reliability analysis method for slam-shut side sliding doors

Abstract

The present invention discloses a durability reliability analysis method for a side sliding door that is suddenly closed. The present invention can better identify the durability reliability problem of the side sliding door that is suddenly closed during the research and development and design verification stage. The method can accurately identify areas with insufficient durability reliability and propose effective rectification plans during the design and development stage, accurately guide the forward design of the sliding door assembly system, do not need to carry out actual vehicle test research, shorten the test cycle, and reduce the analysis and test costs.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a method for analyzing the durability reliability of a side sliding door when it is violently closed. Background Art

[0002] Currently, vehicle door structures are becoming increasingly diverse. Side sliding doors are popular with customers due to their aesthetically pleasing appearance, practicality, and minimal space requirements. They are widely used in commercial vehicles such as MPVs. During parking, passengers inevitably open and close the side sliding doors when getting on and off the vehicle.

[0003] However, the energy of a sliding door's opening and closing motion is random, especially when it's slammed shut. This creates the risk of deformation and even cracking between the sliding door assembly and the vehicle's sheet metal. Therefore, it's necessary to analyze the durability and reliability of a sliding door's slam shut. Existing research and analysis primarily involves actual vehicle testing, which is time-consuming and costly. Summary of the Invention

[0004] To this end, an embodiment of the present invention proposes a side sliding door slam closure durability reliability analysis method to achieve forward analysis and solve the problems of long test cycle and high cost in the prior art.

[0005] A method for analyzing the durability reliability of a side-sliding door when it is slammed shut according to an embodiment of the present invention includes:

[0006] Step 1: Import the side sliding door assembly model data designed based on Catia into HyperMesh for pre-processing. Assign material parameters based on the material BOM, establish a revolute pair based on the kinematic relationship, and obtain the BDF file under the Nastran module. Then, perform modal analysis to obtain the corresponding MNF neutral file.

[0007] Step 2: Combine the B-spline fitting CLD curves from the compression tests of the sealing strip and buffer block to establish the distance and sealing reaction force functions for the compression of the side sliding door sealing strip, buffer block, and inner panel. Apply this to the flexible body side sliding door assembly model in the Adams module. Use impact-based contact for contact processing and establish a related rotational pair to achieve dynamic simulation of the side sliding door closing process and obtain the corresponding differential expression equation of the dynamic model. Establish an iterative calculation process for the differential expression equation in Simulink, set simulation control parameters, and obtain the minimum closing speed in the fully open state, thereby obtaining the minimum closing energy E0.

[0008] Step 3: Combined with the minimum closing energy E0, different margin multiples are set to simulate low-energy closing actions and high-energy closing actions. The DMU is operated through Catia, and the digital model is moved to the closed state and slightly open state. The position of the velocity axis is determined using the mechanism analysis method. The calculation method for determining the angular velocity of the side sliding door when it is suddenly closed is used to obtain the angular velocity of the side sliding door about the velocity axis in the display dynamics simulation under the Abaqus module.

[0009] Step 4: Convert the finite element model to the Abaqus module in the Hypermesh pre-processing module. Extract part of the vehicle body model and the entire side sliding door assembly model as model input for the display dynamics simulation. Perform universal contact processing on the elements in the extracted areas where contact is likely to occur during the collision process. Establish a revolute pair for the rotating part. Use the display calculation time setting method to calculate the display analysis time value set in the Abaqus display analysis. Set the output displacement, stress, strain, and energy history results based on the different INP calculation files for high and low energy output.

[0010] Step 5: Import the Odb file of the analysis result calculated by inp into Hyperview for viewing to see whether the shutdown process is normal and whether the energy history curve is normal. If not, find the cause and solve it and recalculate. If it is normal, import the Odb file into Ncode software for durability analysis.

[0011] Step 6: According to the durability specification of the fierce closing, the number of low-energy fierce closing cycles and the number of high-energy fierce closing cycles are obtained, and the durability result files of the two are cumulatively superimposed. If the cumulative damage superposition value is greater than the evaluation value, an optimization and rectification plan is carried out, and the design is fed back and re-verified; if the cumulative damage superposition value is less than the evaluation value, the requirements are met and the data is archived.

[0012] The side sliding door slam durability reliability analysis method provided by the embodiments of the present invention can better identify side sliding door slam durability reliability issues during the R&D and design verification phase. This method can accurately identify areas of insufficient durability reliability and propose effective remediation plans during the design and development phase, precisely guiding the forward design of the sliding door assembly system. This method eliminates the need for actual vehicle testing, shortens the testing cycle, and reduces analysis and testing costs. Compared to existing technologies, it has the following beneficial effects:

[0013] 1. During the project development process, the time for forward development of the side sliding door's durability can be greatly reduced. During the forward development, the structural and durability analysis of the side sliding door can be studied first, and the feedback can be used for forward design and provide direction for effective lightweight design while meeting the evaluation requirements;

[0014] 2. In the numerical simulation work, the sliding door closing process is decomposed, and the time used for dynamic analysis is reasonably calculated to save numerical calculation time and result storage space;

[0015] 3. Considering the durability fatigue of sheet metal and solder joints, the possible risk areas of sheet metal and solder joint failure are identified first, and subsequent optimization plans are prepared.

[0016] In addition, the side sliding door slam closure durability reliability analysis method provided by the embodiment of the present invention also has the following technical features:

[0017] Furthermore, in step 3, the margin multiple is set as:

[0018] The closing energy of the low-energy closing action is 1.05E0, and the closing energy of the high-energy closing action is 1.25E0.

[0019] Furthermore, in step 3, the digital model is moved to the closed state and the slightly open state, and the position of the velocity axis is determined by the mechanism analysis method as follows:

[0020] Get the coordinates of points A, B, C, and D on the side sliding door. Points A and B are diagonally opposite points C and D on the side sliding door. The coordinates of point A are (a1, a2, a3), the coordinates of point B are (b1, b2, b3), the coordinates of point C are (c1, c2, c3), and the coordinates of point D are (d1, d2, d3).

[0021] Then the coordinate F of the velocity center on the XY plane is (u1, u2, u3), and it satisfies:

[0022]

[0023]

[0024] Furthermore, in step 3, the calculation method for determining the angular velocity of the side sliding door when it is suddenly closed is used to obtain the angular velocity of the side sliding door about the instantaneous velocity axis in the dynamic simulation displayed in the Abaqus module. The calculation formula for the angular velocity ω is:

[0025]

[0026] I zz，cg =I zz +Md 2

[0027]

[0028] Where E is the energy required to slam the side sliding door shut; M is the mass of the side sliding door; X cg and Y cgare the horizontal and vertical coordinates of the center of gravity of the side sliding door in the slightly open state; I zz is the moment of inertia of the side sliding door around the Z axis; I zz，cg It is the moment of inertia of the side sliding door around its own center of gravity axis;

[0029] Furthermore, in step 4, in the step of calculating the display analysis time value set in the Abaqus display analysis using the method for setting the display calculation time, the expression of the display analysis time value t is as follows:

[0030]

[0031] Among them, S1 is the total length of the centerline trajectory of the side sliding door from the fully open state to the closed state, S2 is the length of the motion trajectory of the side sliding door from the fully open state to the slightly open state, and v is the horizontal speed of the sliding in the X direction.

[0032] Furthermore, in step 6, the number of low-energy hard-closing cycles is 90% of the preset hard-closing endurance cycles, and the number of high-energy hard-closing cycles is 10% of the preset hard-closing endurance cycles.

[0033] Additional aspects and advantages of the present invention will be set forth in part in the following description and, in part, will be obvious from the following description, or may be learned through embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the embodiments of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a flow chart of a method for analyzing the durability reliability of a side sliding door slamming shut according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the principle of using the mechanism analysis method to determine the position of the velocity center axis. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] See also Figure 1 A side sliding door slam-shut durability reliability analysis method provided by an embodiment of the present invention includes the following steps:

[0039] Step 1: Import the side sliding door assembly model data designed according to Catia into HyperMesh for pre-processing. Assign material parameters according to the material BOM, establish a revolute pair based on the kinematic relationship, obtain the BDF file under the Nastran module, and then perform modal analysis to obtain the corresponding MNF neutral file.

[0040] Step 2: Combine the B-spline fitting CLD curve of the compression test of the sealing strip and buffer block to establish the distance and sealing reaction force function of the compression effect of the side sliding door sealing strip, buffer block and inner panel, and apply it to the flexible body side sliding door assembly model under the Adams module; use Impact-based contact for contact processing, and establish a related rotating pair to realize the dynamic simulation of the side sliding door closing process and obtain the corresponding differential expression equation of the dynamic model; establish an iterative calculation process for the differential expression equation in Simulink, set the simulation control parameters, and obtain the minimum closing speed in the fully open state, thereby obtaining the minimum closing energy E0.

[0041] Step 3: Combined with the minimum closing energy E0, different margin multiples are set to simulate low-energy closing actions and high-energy closing actions. DMU operation is performed through Catia to move the digital model to the closed state and slightly open state. The position of the velocity axis is determined by the mechanism analysis method. The calculation method for determining the angular velocity of the side sliding door when it is suddenly closed is used to obtain the angular velocity of the side sliding door about the velocity axis in the display dynamics simulation under the Abaqus module.

[0042] In this embodiment, the margin multiple is set as:

[0043] The closing energy of the low-energy closing action is 1.05E0, and the closing energy of the high-energy closing action is 1.25E0.

[0044] Among them, the digital model is moved to the closed state and the slightly open state, and the position of the speed axis is determined by the mechanism analysis method as follows:

[0045] Get the coordinates of the four points A, B, C, and D on the side sliding door (such as Figure 2 As shown), points A and B and points C and D are set diagonally on the side sliding door. The coordinates of point A are (a1, a2, a3), the coordinates of point B are (b1, b2, b3), the coordinates of point C are (c1, c2, c3), and the coordinates of point D are (d1, d2, d3);

[0046] Then the coordinate F of the velocity center on the XY plane is (u1, u2, u3), and it satisfies:

[0047]

[0048]

[0049] Among them, using the calculation method for determining the angular velocity of the side sliding door when it is suddenly closed, in the step of obtaining the angular velocity of the side sliding door about the instantaneous velocity axis in the dynamic simulation under the Abaqus module, the calculation formula of the angular velocity ω is:

[0050]

[0051] I zz，cg =I zz +Md 2

[0052]

[0053] Where E is the energy required to slam the side sliding door shut; M is the mass of the side sliding door; X cg and Y cg are the horizontal and vertical coordinates of the center of gravity of the side sliding door in the slightly open state; I zz is the moment of inertia of the side sliding door around the Z axis; I zz，cg It is the moment of inertia of the side sliding door around its own center of gravity axis;

[0054] Step 4: Convert the finite element model to the Abaqus module under the Hypermesh pre-processing module, intercept part of the body model and the entire side sliding door assembly model as the model input for the display dynamic simulation, perform general contact processing on the elements of the intercepted partial area where contact may occur during the collision process, establish the rotating pair of the rotating part, and use the method for setting the display calculation time to calculate the display analysis time value set in the Abaqus display analysis. According to the different INP calculation files for high / low energy output, set the output displacement, stress, strain and energy history results.

[0055] Among them, in order to improve the efficiency of calculation and save the storage capacity and size of the calculation result file, a method for efficiently calculating the time required for the Abaqus analysis display calculation is proposed, thereby avoiding the debugging time of the model and improving the efficiency of the simulation calculation. Specifically, in the step of calculating the display analysis time value set in the Abaqus display analysis using the method for setting the display calculation time, the expression of the display analysis time value t is as follows:

[0056]

[0057] Among them, S1 is the total length of the centerline trajectory of the side sliding door from the fully open state to the closed state, S2 is the length of the motion trajectory of the side sliding door from the fully open state to the slightly open state, and v is the horizontal speed of the sliding in the X direction.

[0058] Step 5: Import the Odb file of the analysis result calculated by inp into Hyperview for viewing to see whether the shutdown process is normal and whether the energy history curve is normal. If not, find the cause and solve it and recalculate. If it is normal, import the Odb file into Ncode software for durability analysis.

[0059] Step 6: According to the durability specification of the fierce closing, the number of low-energy fierce closing cycles and the number of high-energy fierce closing cycles are obtained, and the durability result files of the two are cumulatively superimposed. If the cumulative damage superposition value is greater than the evaluation value, an optimization and rectification plan is carried out, and the design is fed back and re-verified; if the cumulative damage superposition value is less than the evaluation value, the requirements are met and the data is archived.

[0060] The number of low-energy hard-off cycles is 90% of the preset hard-off durability cycles, and the number of high-energy hard-off cycles is 10% of the preset hard-off durability cycles.

[0061] In summary, the side sliding door slam durability reliability analysis method provided by the present invention can better identify side sliding door slam durability reliability issues during the R&D and design verification stages. This method can accurately identify areas of insufficient durability reliability and propose effective rectification plans during the design and development stages, precisely guiding the forward design of the sliding door assembly system. It eliminates the need for actual vehicle testing, shortens the testing cycle, and reduces analysis and testing costs. Compared to existing technologies, this method has the following beneficial effects:

[0062] 1. During the project development process, the time for forward development of the side sliding door's durability can be greatly reduced. During the forward development, the structural and durability analysis of the side sliding door can be studied first, and the feedback can be used for forward design and provide direction for effective lightweight design while meeting the evaluation requirements;

[0063] 2. In the numerical simulation work, the sliding door closing process is decomposed, and the time used for dynamic analysis is reasonably calculated to save numerical calculation time and result storage space;

[0064] 3. Considering the durability fatigue of sheet metal and solder joints, the possible risk areas of sheet metal and solder joint failure are identified first, and subsequent optimization plans are prepared.

[0065] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0066] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0067] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A side sliding door slam closure durability reliability analysis method, characterized in that: include: Step 1: Import the side sliding door assembly model data designed based on Catia into HyperMesh for pre-processing. Assign material parameters based on the material BOM, establish a revolute pair based on the kinematic relationship, and obtain the BDF file under the Nastran module. Then, perform modal analysis to obtain the corresponding MNF neutral file. Step 2: Combine the B-spline fitting CLD curves from the compression tests of the sealing strip and buffer block to establish the distance and sealing reaction force functions for the compression of the side sliding door sealing strip, buffer block, and inner panel. Apply this to the flexible body side sliding door assembly model in the Adams module. Use impact-based contact for contact processing and establish a related rotational pair to achieve dynamic simulation of the side sliding door closing process and obtain the corresponding differential expression equation of the dynamic model. Establish an iterative calculation process for the differential expression equation in Simulink, set simulation control parameters, and obtain the minimum closing speed in the fully open state, thereby obtaining the minimum closing energy E0. Step 3: Combined with the minimum closing energy E0, different margin multiples are set to simulate low-energy closing actions and high-energy closing actions. The DMU is operated through Catia, and the digital model is moved to the closed state and slightly open state. The position of the velocity axis is determined using the mechanism analysis method. The calculation method for determining the angular velocity of the side sliding door when it is suddenly closed is used to obtain the angular velocity of the side sliding door about the velocity axis in the display dynamics simulation under the Abaqus module. Step 4: Convert the finite element model to the Abaqus module in the Hypermesh pre-processing module, extract part of the vehicle body model and the entire side sliding door assembly model as the model input for the display dynamic simulation, perform general contact processing on the elements in the extracted area where contact may occur during the collision process, establish the revolute pair of the rotating part, and use the display calculation time setting method to calculate the display analysis time value set in the Abaqus display analysis. Set the output displacement, stress, strain, and energy history results based on different input calculation files for high energy and low energy output. Step 5: Import the Odb file of the analysis result calculated by inp into Hyperview for viewing to see whether the shutdown process is normal and whether the energy history curve is normal. If not, find the cause and solve it and recalculate. If it is normal, import the Odb file into Ncode software for durability analysis. Step 6: According to the hard-off durability specification, the number of low-energy hard-off cycles and the number of high-energy hard-off cycles are obtained, and the durability result files of the two are cumulatively superimposed. If the cumulative damage superposition value is greater than the evaluation value, an optimization and rectification plan is implemented, and the design is fed back and re-calculated; if the cumulative damage superposition value is less than the evaluation value, the requirements are met and the data is archived; In step 3, the calculation method for determining the angular velocity of the side sliding door when it is suddenly closed is used to obtain the angular velocity of the side sliding door about the instantaneous velocity axis in the dynamic simulation under the Abaqus module. The calculation formula of the angular velocity ω is: I zz，cg =I zz +Md 2 Where E is the energy required to slam the side sliding door shut; M is the mass of the side sliding door; X cg and Y cg are the horizontal and vertical coordinates of the center of gravity of the side sliding door in the slightly open state; I zz is the moment of inertia of the side sliding door around the Z axis; I zz，cg It is the moment of inertia of the side sliding door around its own center of gravity axis.

2. The side sliding door slam closure durability reliability analysis method according to claim 1, characterized in that: In step 3, the margin multiple is set as: The closing energy of the low-energy closing action is 1.05E0, and the closing energy of the high-energy closing action is 1.25E0.

3. The side sliding door slam closure durability reliability analysis method according to claim 1, characterized in that: In step 3, the digital model is moved to the closed state and the slightly open state, and the position of the velocity axis is determined by the mechanism analysis method as follows: Get the coordinates of points A, B, C, and D on the side sliding door. Points A and B are diagonally opposite points C and D on the side sliding door. The coordinates of point A are (a1, a2, a3), the coordinates of point B are (b1, b2, b3), the coordinates of point C are (c1, c2, c3), and the coordinates of point D are (d1, d2, d3). Then the coordinate F of the velocity center on the XY plane is (u1, u2, u3), and it satisfies:

4. The side sliding door slam closure durability reliability analysis method according to claim 1, characterized in that: In step 4, the display analysis time value set in the Abaqus display analysis is calculated using the method for setting the display calculation time. The expression for the display analysis time value t is as follows: Among them, S1 is the total length of the centerline trajectory of the side sliding door from the fully open state to the closed state, S2 is the length of the motion trajectory of the side sliding door from the fully open state to the slightly open state, and v is the horizontal speed of the sliding in the X direction.

5. The side sliding door slam closure durability reliability analysis method according to claim 1, characterized in that: In step 6, the number of low-energy hard-closing cycles is 90% of the preset hard-closing endurance cycles, and the number of high-energy hard-closing cycles is 10% of the preset hard-closing endurance cycles.

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