Strength analysis method and system for pop-up window replacement assembly with supporting and limiting mechanism

Abstract

The invention relates to a strength analysis method and system for a pop-up window replacement assembly with a supporting and limiting mechanism, and the method comprises the steps: obtaining the type of a connection point according to a finite element model formed by a grid model for connecting all parts of the pop-up window replacement assembly under a whole vehicle coordinate system, and building a pop-up window replacement tree structure table in combination with a bom table; analyzing the finite element model under different working condition boundary conditions to obtain stress nephograms of corresponding working conditions; according to the pop-up window tree structure table and the stress cloud atlas, performing analysis in combination with target strength cloud atlas corresponding to different working condition boundary conditions so as to screen out to-be-optimized parts and connection points; stress conditions of different parts and connection points between the parts under different working conditions are simulated and analyzed, influence factors which do not meet requirements in a design scheme can be accurately known at a time in combination with a target strength cloud picture and a pop-up window tree structure table, advantages and disadvantages of the design scheme are determined in the design and development stage, analysis steps are saved, and the design efficiency is improved. And the optimal design scheme can be obtained through rapid optimization iteration.

Description

Technical Field

[0001] The present application relates to the field of automobile parts design, and in particular to a strength analysis method and system for a bullet-proof window assembly with a support and limiting mechanism. Background Art

[0002] When the bullet-changing window assembly is in the closed state, it is bulletproof, dustproof and waterproof; when the bullet-changing window assembly is in the open state, the support rod is used to limit the position to be in an upright state to serve as a shield at the rear, thereby providing a bullet-proof effect to the rear.

[0003] The structural strength of the bullet-changing window assembly with a support and limit mechanism needs to meet the design requirements in the closed and open states. However, the factors affecting the strength in the closed and open states include torsion bars, support rods, welding points, hinge points, etc. The relevant strength analysis methods are difficult to quickly and comprehensively analyze the above factors and determine that a certain item does not meet the requirements, resulting in a complicated iterative design optimization process. It is difficult to clearly identify the advantages and disadvantages of the design scheme during the design and development stage. Summary of the invention

[0004] The embodiments of the present application provide a method and system for analyzing the strength of a bullet-changing window assembly with a supporting and limiting mechanism, so as to solve the problem in the related art that it is difficult to quickly and comprehensively analyze the strength of a bullet-changing window assembly with a supporting and limiting mechanism.

[0005] In a first aspect, a strength analysis method for a bullet-changing window assembly with a support and limiting mechanism is provided, comprising:

[0006] Establish mesh models of various parts of the window replacement assembly in the vehicle coordinate system, and connect the mesh models to form a finite element model;

[0007] Obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table;

[0008] Analyzing the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition;

[0009] According to the pop-up window tree structure table and stress cloud diagram, analysis is performed in combination with the target strength cloud diagram corresponding to different working condition boundary conditions to screen out the parts and connection points to be optimized.

[0010] In some embodiments, establishing a mesh model of each part of the bullet-changing window assembly includes the following steps:

[0011] The sheet metal parts and tube profile parts in the swap pop-up window assembly are meshed using shell elements to establish the corresponding mesh model;

[0012] The rods and castings in the swap window assembly are meshed using solid elements to establish the corresponding mesh model;

[0013] The sheet metal parts include a bullet-changing window top cover and a roof cover connected to the bullet-changing window; the tube profile parts include a roof cover reinforcement beam and a bullet-changing window top cover reinforcement beam;

[0014] The rod comprises a torsion rod and a support and limiting mechanism; the casting comprises a hinge mechanism and a locking mechanism.

[0015] In some embodiments, connecting the mesh models to form a finite element model includes the following steps:

[0016] Get the BOM table of the pop-up window replacement assembly;

[0017] Define the material of each part according to the BOM table, and define the material thickness of the part created by shell elements;

[0018] The connection points between parts connected by bolts are connected through rigid units; the connection points between parts connected by welding are connected through shell unit common nodes; the connection points between parts connected by spot welding are connected through welding unit combination unit weld point model units to form the finite element model.

[0019] In some embodiments, the connection point type is obtained according to the finite element model, and then a pop-up window tree structure table about the finite element model is created in combination with the bom table, including the following steps:

[0020] The mesh model corresponding to each part is formed into the same component separately, and then named according to the project code, part number, material name, and material thickness to obtain the corresponding child nodes;

[0021] Put all the connection points of the rigid units into the same component, then name it RBE2 and get the corresponding subnodes;

[0022] According to the material thickness, all the connection points connected by welding are respectively set to a component, and then named according to the project number, pop-up window assembly code, welding material, and material thickness to obtain multiple corresponding child nodes;

[0023] According to the number of welding layers, all connection points connected by spot welding are set to a component, and then named according to the project number, pop-up window assembly code, SPOT-number of layers, and combined unit welding point model unit to obtain corresponding multiple child nodes;

[0024] According to the number of welding layers, a component is set for the welding core 3D unit used for spot welding, and then named according to the project number, pop-up window assembly code, SPOT-number of layers, and ACM-SOLID to obtain the corresponding child node;

[0025] Set an assembly for each of the lock mechanism, hinge mechanism, and support limit mechanism, and then name them according to the project code and assembly code to obtain multiple corresponding child nodes;

[0026] All the above child nodes are collected to form a pop-up window tree structure table.

[0027] In some embodiments, analyzing the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition includes the following steps:

[0028] When the bullet-changing window assembly is closed, the finite element model is subjected to installation point strength analysis and torsion bar end strength analysis to obtain the corresponding stress cloud diagram;

[0029] When the bullet-changing window assembly is in the open state, the finite element model is subjected to impact condition analysis and frequency sweep condition analysis to obtain the corresponding stress cloud diagram.

[0030] In some embodiments, when the bullet-changing window assembly is closed, the finite element model is subjected to installation point strength analysis and torsion bar end strength analysis to obtain corresponding stress cloud diagrams, including the following steps:

[0031] Adjust the bullet-changing window of the finite element model to the closed state, cancel the torsion bar connection, apply the extracted node support reaction force to the hinge mechanism, and apply gravity to obtain the corresponding stress cloud diagram;

[0032] The bullet-changing window of the finite element model is adjusted to the closed state, and the strength of the left and right hinges of the hinge mechanism are analyzed respectively; the steps for the strength analysis of the left hinge are as follows: full constraint of the fixed point, contact between the left end of the torsion bar and the mounting groove of the left hinge, and grabbing the cross-sectional unit of the shaft diameter of the right end of the torsion bar; constraining the main nodes of the rigid unit; releasing the Y-direction movement and rotation of the vehicle coordinate system according to the actual installation state of the torsion bar; applying the extraction torque to obtain the stress cloud map.

[0033] In some embodiments, obtaining the extracted node reaction force and the extracted torque comprises the following steps:

[0034] One end of the mesh model of the torsion bar is constrained and fixed, and the forced displacement and torsion angle parameters of the torsion bar from the design state to the closed state are applied to the other end to obtain the extracted node support reaction force and extracted torque.

[0035] In some embodiments, when the bullet-changing window assembly is in the open state, the finite element model is subjected to impact condition analysis and frequency sweep condition analysis respectively to obtain a corresponding stress cloud diagram, including the following steps:

[0036] Adjust the bullet-changing window of the finite element model to the maximum opening angle, and then apply the designed gravity acceleration in the three directions of the vehicle coordinate system X, Y, and Z to obtain the stress cloud diagram corresponding to the impact condition;

[0037] The bullet-changing window of the finite element model is adjusted to the maximum opening angle, and then the hinge mounting holes of the hinge mechanism and the mounting holes of the support limit mechanism are fully constrained. The designed acceleration excitation is loaded along the X, Y, and Z directions of the vehicle coordinate system respectively, and the frequency is swept from 0 to 100 Hz to obtain the frequency stress curve and stress cloud diagram.

[0038] In some embodiments, according to the pop-up window tree structure table and the stress cloud map, and in combination with the target strength cloud map corresponding to different working condition boundary conditions, analysis is performed to screen out the parts and connection points to be optimized, including the following steps:

[0039] Obtain the target strength cloud map corresponding to the boundary conditions of different working conditions, and then find the target stress values ​​corresponding to the parts and connection points in the pop-up window tree structure table in the target strength cloud map;

[0040] Find the actual stress values ​​corresponding to the parts and connection points in the tree structure table of the pop-up window in the stress cloud diagram corresponding to the boundary conditions of different working conditions;

[0041] Compare the actual stress value and the target stress value corresponding to each working condition boundary condition;

[0042] If the actual stress value under all working condition boundary conditions is less than the target stress value, the bullet-changing window assembly with the support and limit mechanism meets the requirements;

[0043] Otherwise, it is not satisfied, and the parts and connection points corresponding to the actual stress values ​​greater than or equal to the target stress values ​​are taken as the parts and connection points to be optimized;

[0044] The stress is the maximum stress value.

[0045] In a second aspect, a bullet-changing window assembly strength analysis system with a support and limiting mechanism is provided, comprising:

[0046] The first module is used to establish a mesh model of each part of the bullet-changing window assembly in the vehicle coordinate system, and connect each mesh model to form a finite element model;

[0047] The second module is used to obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table;

[0048] The third module is used to analyze the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition;

[0049] The fourth module is used to analyze the target strength cloud map corresponding to the pop-up window tree structure table and the stress cloud map in combination with the target strength cloud map corresponding to the boundary conditions of different working conditions to screen out the parts and connection points to be optimized.

[0050] The beneficial effects of the technical solution provided by this application include:

[0051] An embodiment of the present application provides a strength analysis method and system for a bullet-changing window assembly with a support and limiting mechanism. The type of connection point can be obtained according to a finite element model formed by connecting a grid model of each part of the bullet-changing window assembly in the coordinate system of the entire vehicle, and then a bullet-changing window tree structure table is created in combination with the bom table; the finite element model is then analyzed under different operating boundary conditions to obtain a stress cloud map corresponding to the operating condition; analysis is performed based on the bullet-changing window tree structure table and the stress cloud map, and in combination with the target strength cloud map corresponding to the different operating boundary conditions, to screen out parts and connection points to be optimized; the above steps can simulate and analyze the stress conditions of different parts and connection points between parts under different operating conditions, and in combination with the target strength cloud map and the bullet-changing window tree structure table, the influencing factors that cause the design scheme to fail to meet the requirements can be accurately known at one time, the advantages and disadvantages of the design scheme can be clarified in the design and development stage, and the analysis steps can be saved, so that designers can quickly optimize and iterate to obtain the optimal design scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of a general flow chart of a strength analysis method for a bullet-changing window assembly with a support and limiting mechanism provided in an embodiment of the present application;

[0054] Figure 2 A schematic simulation diagram of a finite element model of a bullet-changing window assembly with a support and limiting mechanism provided in an embodiment of the present application;

[0055] Figure 3 A simulation schematic diagram of obtaining extraction node support reaction force and extraction torque provided in an embodiment of the present application;

[0056] Figure 4 A schematic diagram of a simulation of a finite element model of a hinge mechanism in a closed state under applied gravity provided in an embodiment of the present application;

[0057] Figure 5 A simulation schematic diagram for analyzing the strength of the left hinge and the right hinge of the hinge mechanism in a closed state provided in an embodiment of the present application;

[0058] Figure 6 A schematic diagram of a simulation of an impact condition when the bullet-changing window is open provided in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of a simulation of a frequency sweep condition with the pop-up window open provided in an embodiment of the present application.

[0060] In the figure: 1. Replacement window top cover; 2. Replacement window top cover reinforcement beam; 3. Support limit mechanism; 4. Hinge mechanism; 5. Lock mechanism; 6. Torsion bar; 7. Roof cover; 8. Roof cover reinforcement beam. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0062] The structural strength of the bullet-changing window assembly with a support and limit mechanism needs to meet the design requirements in the closed and open states. However, the factors affecting the strength in the closed and open states include torsion bars, support rods, welding points, hinge points, etc. The relevant strength analysis methods are difficult to quickly and comprehensively analyze the above factors and determine that a certain item does not meet the requirements, resulting in a complicated iterative design optimization process. It is difficult to clearly identify the advantages and disadvantages of the design scheme during the design and development stage.

[0063] Therefore, on the first aspect, the embodiments of the present application provide a method and system for analyzing the strength of a bullet-changing window assembly with a supporting and limiting mechanism, so as to solve the problem in the related art that it is difficult to quickly and comprehensively conduct an effective analysis of the strength of a bullet-changing window assembly with a supporting and limiting mechanism.

[0064] See also Figure 1 and Figure 2 , a strength analysis method for a bullet-changing window assembly with a support and limiting mechanism, comprising the following steps:

[0065] Step 100: Establish mesh models of various parts of the window replacement assembly in the vehicle coordinate system, and connect the mesh models to form a finite element model;

[0066] Step 101, obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table;

[0067] Step 102, analyzing the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition;

[0068] Step 103: Analyze the target strength cloud map corresponding to different working condition boundary conditions according to the tree structure table and stress cloud map in the pop-up window to select the parts and connection points to be optimized.

[0069] The above steps first establish a comprehensive finite element model, including all parts of the pop-up window assembly and all connection forms between the two parts, so as to adapt to the actual situation, and then simulate and analyze the stress conditions of different parts and connection points between parts under different working conditions, that is, the conditions of each part under opening and closing conditions can be considered. Then, combined with the target strength cloud map and the pop-up window tree structure table, the influencing factors that cause the design scheme to fail to meet the requirements can be accurately known at one time, the advantages and disadvantages of the design scheme can be clarified in the design and development stage, and the analysis steps can be saved, so that the designers can quickly optimize and iterate to obtain the optimal design scheme.

[0070] In some preferred implementations, how to comprehensively and effectively establish a finite element model in step 100, and how to reflect the stress conditions of the bullet-changing window assembly with a support and limiting mechanism when it is opened and closed, is described in detail below:

[0071] Step 10001, establishing a mesh model of each part of the bullet-changing window assembly, including the following steps:

[0072] Step 10001-1, meshing the sheet metal parts and tube profile parts in the swap pop-up window assembly using shell elements to establish a corresponding mesh model;

[0073] Step 10001-2, meshing the rods and castings in the swap pop-up window assembly using solid units to establish a corresponding mesh model;

[0074] Among them, the sheet metal parts include a bullet-changing window top cover 1 and a roof cover 7 connected to the bullet-changing window; the tube profile parts include a roof cover reinforcement beam 8 and a bullet-changing window top cover reinforcement beam 2; the rods include a torsion bar 6 and a support and limiting mechanism 3; the castings include a hinge mechanism 4 and a locking mechanism 5.

[0075] Step 10002, connecting the mesh models to form a finite element model, includes the following steps:

[0076] Step 10002-1, obtain the BOM table of the pop-up window assembly; BOM Bill of Material, that is, a file that describes the product structure in a data format, is a product structure data file that can be recognized by a computer;

[0077] Step 10002-2, define the material of each part according to the BOM table, and define the material thickness of the part established by the shell element;

[0078] Step 10002-3, connecting the connection points between parts connected by bolts through rigid units RBE2; connecting the connection points between parts connected by welding through shell unit common nodes; connecting the connection points between parts connected by spot welding through combined unit weld point model units to form a finite element model. Combined unit weld point model unit A combined unit weld point model unit is composed of a hexahedral unit HEXA and a connection unit RBE3;

[0079] In the process of establishing the finite element model, the types of different parts and the characteristics of the connection points between parts are taken into consideration and established using different units, so as to be closer to the actual situation. At the same time, it is also convenient for the subsequent establishment of the pop-up window tree structure table and stress analysis to distinguish different parts.

[0080] In some preferred embodiments, in step 101, in order to facilitate subsequent analysis, screen the parts and connection points to be optimized, accurately know the influencing factors that the design scheme does not meet the requirements, clarify the advantages and disadvantages of the design scheme in the design and development stage, and save analysis steps, it is necessary to establish a pop-up window tree structure table, and the establishment method is as follows:

[0081] Step 10101, the mesh model corresponding to each part is separately formed into the same component component, and then named according to the project code, part number, material name, and material thickness to obtain the corresponding child node;

[0082] Step 10102, put all the connection points of the rigid units into the same component, then name it RBE2, and get the corresponding child nodes;

[0083] Step 10103, set a component for each connection point connected by welding according to the material thickness, and then name them according to the project number, pop-up window assembly code, welding material, and material thickness to obtain corresponding multiple child nodes; the naming in HyperWorks needs to be in English, and weld is used here to identify the welding material.

[0084] Step 10104, according to the number of welding layers, a component is set for each connection point connected by spot welding, and then named according to the project number, the pop-up window assembly code, SPOT-number of layers, and the combined unit welding point model unit to obtain corresponding multiple child nodes; SPOT-number of layers is the number of welding layers;

[0085] Step 10105, according to the number of welding layers, a component is set corresponding to the welding core 3D unit used for spot welding, and then named according to the project number, the pop-up window assembly code, SPOT-number of layers, and ACM-SOLID to obtain the corresponding child node;

[0086] Step 10106: Set an assembly corresponding to the lock mechanism 5, the hinge mechanism 4, and the support and limit mechanism 3 respectively, and then name them according to the project code and the assembly code to obtain corresponding multiple child nodes;

[0087] Step 10107: Gather all the above child nodes to form a pop-up window tree structure table.

[0088] The naming rules of the pop-up window tree structure table above are clearly hierarchical and easy to read and operate for simulation engineers.

[0089] In some preferred embodiments, for step 102, since the stress required for the bullet-changing window in the closed state and the open state is different, and the required design point in each case is different, it is necessary to consider various possible extreme working conditions of the bullet-changing window assembly, so as to better guide the design engineer to optimize the design of the bullet-changing window, and therefore the following settings are provided:

[0090] Step 102, analyzing the finite element model under different working condition boundary conditions to obtain a stress cloud diagram of the corresponding working condition, including the following steps:

[0091] Step 10200: When the bullet-changing window assembly is closed, perform strength analysis of the mounting point and the end of the torsion bar 6 on the finite element model to obtain corresponding stress cloud diagrams;

[0092] Step 10201: When the bullet-changing window assembly is opened, the finite element model is subjected to impact condition analysis and frequency sweep condition analysis to obtain a corresponding stress cloud diagram.

[0093] Wherein, step 10200 specifically includes:

[0094] refer to Figure 3 , adjust the bullet-changing window of the finite element model to the closed state, cancel the torsion bar 6 connection, apply the extracted node support reaction force to the hinge mechanism 4, and apply gravity at the same time to obtain the corresponding stress cloud map; the gravity is 1G.

[0095] refer to Figure 4, adjust the finite element model's bullet-changing window to the closed state, and analyze the strength of the left and right hinges of the hinge mechanism 4 respectively; the steps for the strength analysis of the left hinge are: full constraint of the fixed point, the left end of the torsion bar 6 establishes contact with the installation slot of the left hinge, and the shaft diameter of the right end of the torsion bar 6 grabs the cross-sectional unit; constrains the main node of the rigid unit; releases the Y-direction movement and rotation of the vehicle coordinate system according to the actual installation state of the torsion bar 6; applies the extraction torque to obtain the stress cloud map. The strength analysis of the right hinge is the same as that of the left hinge.

[0096] Wherein, obtaining the extracted node support reaction force and the extracted torque includes the following steps:

[0097] refer to Figure 5 , one end of the grid model of the torsion bar 6 is constrained and fixed, and the other end is applied with the forced displacement and torsion angle parameters of the torsion bar 6 from the design state to the closed state to obtain the extracted node support reaction force and extracted torque.

[0098] Step 10201, when the bullet-changing window assembly is in the open state, respectively performing impact condition analysis and frequency sweep condition analysis on the finite element model to obtain corresponding stress cloud diagrams, including the following steps:

[0099] refer to Figure 6 , adjust the bullet-changing window of the finite element model to the maximum opening angle, and then apply the designed gravity acceleration, that is, 3.5G acceleration, in the three directions of the vehicle coordinate system X, Y, and Z to obtain the stress cloud map corresponding to the impact condition; its focus is on the stress distribution of the support limit mechanism under the impact condition. Figure 7 The different color reference instructions on the right side of the middle indicate the magnitude of stress;

[0100] refer to Figure 7 , adjust the bullet-changing window of the finite element model to the maximum opening angle, then fully constrain the hinge mounting holes of the hinge mechanism 4 and the mounting holes of the support limit mechanism, load the designed acceleration excitation along the three directions of the vehicle coordinate system X, Y, and Z, and sweep the frequency from 0 to 100 Hz to obtain the frequency stress curve and stress cloud map. The frequency stress curve can be used in conjunction with the stress cloud map to analyze the stress at different frequencies, and the maximum stress can be determined before. It focuses on the stress distribution of the hinge mechanism 4. That is, the frequency stress curve can be used to see the risky areas or nodes, and then find the corresponding parts in the stress cloud map for analysis, which can be convenient for subsequent designers to analyze and optimize the opening condition and give specific optimization directions; in addition, the factors considered for the additional frequency stress curve in this opening condition are that when the worst condition in the opening condition has been met, the closing condition must also be met, and there is no frequency stress curve acquisition step for the closing condition. Figure 7 The different color references on the right side of the middle indicate the magnitude of stress;

[0101] In the above steps, after extracting the stress cloud map, the maximum stress should be extracted, and the extracted maximum stress must be less than the yield strength of the material. In addition, the above steps introduce the stress conditions under different working conditions, which can better guide design engineers to optimize the design of the replacement window. The above working conditions can also represent the direct characterization parameters of the structural strength of the replacement window assembly.

[0102] In some preferred embodiments, step 103, analyzing the pop-up window tree structure table and the stress cloud map in combination with the target strength cloud map corresponding to different working condition boundary conditions to screen out the parts and connection points to be optimized, includes the following steps:

[0103] Step 10300, obtaining target strength cloud maps corresponding to different working condition boundary conditions, and then finding target stress values ​​corresponding to parts and connection points in the pop-up window tree structure table in the target strength cloud map;

[0104] Step 10301, find out the actual stress values ​​corresponding to the parts and connection points in the tree structure table of the pop-up window in the stress cloud diagram corresponding to the boundary conditions of different working conditions;

[0105] Step 10302: Compare the actual stress value and the target stress value corresponding to each working condition boundary condition;

[0106] Step 10303: If the actual stress value under all working condition boundary conditions is less than the target stress value, the bullet-changing window assembly with the support and limit mechanism meets the requirements;

[0107] Step 10304: Otherwise, it is not satisfied, and the parts and connection points corresponding to the actual stress values ​​that are greater than or equal to the target stress values ​​are taken as the parts and connection points to be optimized.

[0108] The above actual stress values ​​and target stress values ​​both refer to the maximum stress. The reason for considering stress to represent structural strength is that excessive stress will damage the structure, and the smaller the stress, the less destructive it is. The bullet-changing window assembly is affected by external forces during use. Through the above steps, it can be simulated and analyzed to determine which working condition the bullet-changing window assembly does not meet, and which specific parts and connection points do not meet the requirements. Then the designer can adjust the design parameters according to the situation to ensure that the bullet-changing window assembly meets the extreme working conditions that may be encountered.

[0109] In a second aspect, a bullet-changing window assembly strength analysis system with a support and limiting mechanism is provided, comprising:

[0110] The first module is used to establish a mesh model of each part of the bullet-changing window assembly in the vehicle coordinate system, and connect each mesh model to form a finite element model;

[0111] The second module is used to obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table;

[0112] The third module is used to analyze the finite element model under different working condition boundary conditions to obtain the stress cloud diagram of the corresponding working condition;

[0113] The fourth module is used to analyze the target strength cloud map corresponding to the pop-up window tree structure table and stress cloud map in combination with the target strength cloud map corresponding to the boundary conditions of different working conditions to screen out the parts and connection points to be optimized.

[0114] Among the above, the functional implementation of each module in the above-mentioned bullet-changing window assembly strength analysis system with a supporting and limiting mechanism corresponds to the steps in the above-mentioned bullet-changing window assembly strength analysis method embodiment with a supporting and limiting mechanism, and their functions and implementation processes will not be repeated here one by one.

[0115] On the third aspect, an embodiment of the present application provides a bullet-changing window assembly strength analysis device with a support and limiting mechanism. The bullet-changing window assembly strength analysis device with a support and limiting mechanism can be a personal computer (PC), a laptop computer, a server, or other device with data processing functions.

[0116] In an embodiment of the present application, a bullet-changing window assembly strength analysis device with a support and limiting mechanism may include a processor, a memory, a communication interface, and a communication bus.

[0117] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0118] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to realize the interconnection of devices inside the bullet-changing window assembly strength analysis device with a support and limit mechanism, and an interface for realizing the interconnection of the bullet-changing window assembly strength analysis device with a support and limit mechanism with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0119] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0120] The processor may be a general processor, which may call the strength analysis program of the bullet-changing window assembly with a support and limit mechanism stored in the memory, and execute the strength analysis method of the bullet-changing window assembly with a support and limit mechanism provided in the embodiment of the present application. For example, the general processor may be a central processing unit (CPU). The method executed when the strength analysis program of the bullet-changing window assembly with a support and limit mechanism is called may refer to the various embodiments of the strength analysis method of the bullet-changing window assembly with a support and limit mechanism of the present application, which will not be repeated here.

[0121] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0122] The computer-readable storage medium of the present application stores a strength analysis program for a bullet replacement window assembly with a support and limiting mechanism, wherein when the strength analysis program for a bullet replacement window assembly with a support and limiting mechanism is executed by a processor, the steps of the strength analysis method for a bullet replacement window assembly with a support and limiting mechanism as described above are implemented.

[0123] Among them, the method implemented when the strength analysis program of the bullet-changing window assembly with a support and limiting mechanism is executed can refer to the various embodiments of the strength analysis method of the bullet-changing window assembly with a support and limiting mechanism of the present application, and will not be repeated here.

[0124] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0125] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article 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, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0126] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A strength analysis method for a bullet-changing window assembly with a support and limit mechanism, characterized in that: It includes: Establish mesh models of various parts of the window replacement assembly in the vehicle coordinate system, and connect the mesh models to form a finite element model; Obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table; Analyzing the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition; According to the pop-up window tree structure table and stress cloud diagram, analysis is performed in combination with the target strength cloud diagram corresponding to different working condition boundary conditions to screen out the parts and connection points to be optimized.

2. The strength analysis method of the bullet-changing window assembly with a support and limiting mechanism according to claim 1 is characterized in that: Establishing the mesh model of each part of the bullet-changing window assembly includes the following steps: The sheet metal parts and tube profile parts in the swap pop-up window assembly are meshed using shell elements to establish the corresponding mesh model; The rods and castings in the swap window assembly are meshed using solid elements to establish the corresponding mesh model; The sheet metal parts include a bullet-changing window top cover (1) and a vehicle roof cover (7) connected to the bullet-changing window; the tubular profile parts include a vehicle roof cover reinforcement beam (8) and a bullet-changing window top cover reinforcement beam (2); The rod comprises a torsion rod (6) and a support and limiting mechanism (3); the casting comprises a hinge mechanism (4) and a locking mechanism (5).

3. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 2 is characterized in that: Connecting the mesh models to form a finite element model includes the following steps: Get the BOM table of the pop-up window assembly; Define the material of each part according to the BOM table, and define the material thickness of the part created by shell elements; The connection points between parts connected by bolts are connected through rigid units; the connection points between parts connected by welding are connected through shell unit common nodes; the connection points between parts connected by spot welding are connected through welding unit combination unit weld point model units to form the finite element model.

4. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 3 is characterized in that: The connection point type is obtained according to the finite element model, and then a pop-up window tree structure table about the finite element model is created in combination with the bom table, including the following steps: The mesh model corresponding to each part is formed into the same component separately, and then named according to the project code, part number, material name, and material thickness to obtain the corresponding child nodes; Put all the connection points of the rigid units into the same component, then name it RBE2 and get the corresponding subnodes; According to the material thickness, all the connection points connected by welding are respectively set to a component, and then named according to the project number, pop-up window assembly code, welding material, and material thickness to obtain multiple corresponding child nodes; According to the number of welding layers, all connection points connected by spot welding are set to a component, and then named according to the project number, pop-up window assembly code, SPOT-number of layers, and combined unit welding point model unit to obtain corresponding multiple child nodes; According to the number of welding layers, a component is set for the welding core 3D unit used for spot welding, and then named according to the project number, pop-up window assembly code, SPOT-number of layers, and ACM-SOLID to obtain the corresponding child node; The locking mechanism (5), the hinge mechanism (4), and the supporting and limiting mechanism (3) are respectively provided with an assembly, and then named according to the project code and the assembly code to obtain corresponding multiple sub-nodes; All the above child nodes are collected to form a pop-up window tree structure table.

5. The strength analysis method of the bullet-changing window assembly with a support and limiting mechanism according to claim 3 is characterized in that: The finite element model is analyzed under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition, including the following steps: When the bullet-changing window assembly is closed, the finite element model is subjected to a strength analysis of the mounting point and a strength analysis of the end of the torsion bar (6) to obtain a corresponding stress cloud diagram; When the bullet-changing window assembly is in the open state, the finite element model is subjected to impact condition analysis and frequency sweep condition analysis to obtain the corresponding stress cloud diagram.

6. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 5, characterized in that: When the bullet-changing window assembly is closed, the finite element model is subjected to a strength analysis of the mounting point and a strength analysis of the end of the torsion bar (6) to obtain a corresponding stress cloud diagram, including the following steps: The bullet-changing window of the finite element model is adjusted to a closed state, the torsion bar (6) connection is cancelled, the reaction force of the extracted node support is applied to the hinge mechanism (4), and gravity is applied at the same time to obtain a corresponding stress cloud diagram; The finite element model's bullet-changing window is adjusted to a closed state, and the strength of the left hinge and the right hinge of the hinge mechanism (4) are analyzed respectively; the steps for analyzing the strength of the left hinge are as follows: the fixed point is fully constrained, the left end of the torsion bar (6) is in contact with the installation groove of the left hinge, and the shaft diameter of the right end of the torsion bar (6) grabs the cross-sectional unit; the main node of the rigid unit is constrained; the Y-direction movement and rotation of the vehicle coordinate system are released according to the actual installation state of the torsion bar (6); and the extraction torque is applied to obtain a stress cloud map.

7. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 6, characterized in that: Obtaining the extracted node reaction force and extracted torque includes the following steps: One end of the grid model of the torsion bar (6) is constrained and fixed, and the other end is applied with forced displacement and torsion angle parameters of the torsion bar (6) from the design state to the closed state, so as to obtain the extracted node support reaction force and the extracted torque.

8. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 5, characterized in that: When the bullet-changing window assembly is open, the finite element model is subjected to impact condition analysis and frequency sweep condition analysis to obtain the corresponding stress cloud diagram, including the following steps: Adjust the bullet-changing window of the finite element model to the maximum opening angle, and then apply the designed gravity acceleration in the three directions of the vehicle coordinate system X, Y, and Z to obtain the stress cloud diagram corresponding to the impact condition; The bullet-changing window of the finite element model is adjusted to the maximum opening angle, and then the hinge mounting hole of the hinge mechanism (4) and the mounting hole of the support limit mechanism are fully constrained, and the designed acceleration excitation is loaded along the three directions of the vehicle coordinate system X, Y, and Z respectively, and the frequency is swept from 0 to 100 Hz to obtain the frequency stress curve and stress cloud map.

9. The strength analysis method of the bullet-changing window assembly with a support and limit mechanism according to claim 1, characterized in that: According to the pop-up window tree structure table and the stress cloud map, and combined with the target strength cloud map corresponding to different working condition boundary conditions, analysis is performed to screen out the parts and connection points to be optimized, including the following steps: Obtain the target strength cloud map corresponding to the boundary conditions of different working conditions, and then find the target stress values ​​corresponding to the parts and connection points in the pop-up window tree structure table in the target strength cloud map; Find the actual stress values ​​corresponding to the parts and connection points in the tree structure table of the pop-up window in the stress cloud diagram corresponding to the boundary conditions of different working conditions; Compare the actual stress value and the target stress value corresponding to each working condition boundary condition; If the actual stress value under all working condition boundary conditions is less than the target stress value, the bullet-changing window assembly with the support and limit mechanism meets the requirements; Otherwise, it is not satisfied, and the parts and connection points corresponding to the actual stress values ​​greater than or equal to the target stress values ​​are taken as the parts and connection points to be optimized; The stress is the maximum stress value.

10. A bullet-changing window assembly strength analysis system with a support and limit mechanism, characterized in that: It includes: The first module is used to establish a mesh model of each part of the bullet-changing window assembly in the vehicle coordinate system, and connect each mesh model to form a finite element model; The second module is used to obtain the connection point type according to the finite element model, and then create a pop-up window tree structure table about the finite element model in combination with the bom table; The third module is used to analyze the finite element model under different working condition boundary conditions to obtain a stress cloud diagram corresponding to the working condition; The fourth module is used to analyze the target strength cloud map corresponding to the pop-up window tree structure table and the stress cloud map in combination with the target strength cloud map corresponding to the boundary conditions of different working conditions to screen out the parts and connection points to be optimized.

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