Simulation method and device of suspension bracket, medium and equipment

Abstract

The invention discloses a simulation method and device of a suspension bracket, a medium and equipment. According to the application, the geometric model of the suspension bracket is constructed through preset software and grid division, and the GAP gap unit, the Bushing unit and the rigid material are integrated, so that the separation and contact states of the hollow rubber bushing and the bracket, the three-dimensional rigidity characteristics of the rubber bushing and the interaction force of the bracket and the cylinder body can be accurately simulated; therefore, the accuracy and reliability of simulation analysis are improved, and powerful support is provided for design optimization of the suspension support.

Description

Technical Field

[0001] The invention relates to the field of simulation of a suspension bracket, and in particular to a simulation method, device, medium and equipment of a suspension bracket. Background Art

[0002] The suspension bracket is an important connecting component between the vehicle powertrain and the vehicle body. Its main function is to support the powertrain, transmit force and torque, and absorb vibration and shock to improve the comfort and safety of the vehicle. In order to ensure that the design of the suspension bracket meets the performance requirements, it is necessary to perform strength and durability analysis on it. Traditional analysis methods mainly rely on physical tests and simplified numerical simulation models.

[0003] 1. Limitations of physical experiments: Physical experiments are costly, time-consuming, and difficult to perform multiple iterations of optimization in the early design stage. The test process may be affected by environmental factors, resulting in limited repeatability and accuracy of the results.

[0004] 2. Problems with traditional numerical simulation models:

[0005] Inaccuracy of simplified models: Traditional numerical simulation models usually simplify the contact and force transmission process between the suspension bracket and the rubber bushing, ignoring the idle stroke problem and three-dimensional stiffness characteristics of the hollow rubber bushing, resulting in a large deviation between the simulation results and the actual test results.

[0006] Imperfect boundary conditions and load application: In traditional models, the boundary conditions of the mounting surface of the suspension bracket and the flexibility of the mounting bolts are often not fully considered. The direct coupling of the bolt holes cannot accurately simulate the deformation and force transmission characteristics of the bolts, affecting the reliability of the simulation results.

[0007] Lack of simulation of the cylinder support characteristics: In traditional models, the cylinder support characteristics are usually simplified, which cannot truly reflect the rigid support effect of the cylinder on the suspension bracket, thus affecting the accurate analysis of the stress condition of the suspension bracket.

[0008] These problems result in the inability of the prior art to accurately simulate the performance of the suspension bracket during actual use. Summary of the invention

[0009] The present invention provides a simulation method, device, medium and equipment for a suspension bracket, so as to solve the problem in the prior art that the performance of the suspension bracket in actual use cannot be accurately simulated.

[0010] In a first aspect, the present application provides a simulation method for a suspension bracket, comprising:

[0011] According to the preset software, preset mesh division, preset GAP gap unit, preset Bushing unit and preset rigid material, a geometric model of the suspension bracket containing the hollow rubber bushing is constructed;

[0012] Wherein, the preset GAP gap unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model;

[0013] According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

[0014] This application uses preset software and meshing to construct a geometric model of a suspension bracket containing a hollow rubber bushing, and integrates preset GAP units, Bushing units and rigid materials in the model, which can achieve accurate simulation analysis of the suspension bracket under different working conditions. The GAP unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder, including support force and reaction force. By combining the characteristics of these preset units and materials, the simulation model can comprehensively and accurately simulate the stress conditions and mechanical behavior of the suspension bracket in actual use, thereby improving the reliability and prediction accuracy of the simulation analysis. This application solves the problem in the prior art that it is impossible to accurately simulate the performance of the suspension bracket in actual use.

[0015] As a preferred embodiment of the first aspect, the geometric model of the suspension bracket containing the hollow rubber bushing is constructed according to the preset software, the preset grid division, the preset GAP gap unit, the preset Bushing unit and the preset rigid material, and further includes:

[0016] Replacing the bolts of the geometric model with preset beam units;

[0017] According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the contact force between the bolts of the actual suspension bracket and the bracket according to the preset beam unit.

[0018] In this preferred embodiment, the present application constructs a geometric model of a suspension bracket containing a hollow rubber bushing by using preset software and meshing, and integrates preset GAP gap units, Bushing units, rigid materials in the model, and replaces bolts with preset beam units, so as to realize accurate simulation analysis of the suspension bracket under different working conditions. The GAP gap unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder. In addition, replacing the bolts with preset beam units can simulate the flexible characteristics of the bolts, so that the simulation model can more accurately reflect the contact force conditions between the bolts and the bracket, avoiding the problem of inaccurate force transmission caused by directly coupling the bolt holes in the traditional model.

[0019] As a preferred embodiment of the first aspect, the geometric model is configured to simulate the separation state and contact state of the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit, specifically:

[0020] So that the geometric model simulates the initial gap and contact between the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit and the preset initial gap value;

[0021] If the moving distance of the hollow rubber bushing is less than the initial gap value, the simulation model simulates the separation state between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit;

[0022] If the moving distance of the hollow rubber bushing is greater than the initial gap value, the simulation model simulates the contact and force transmission between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit.

[0023] In this preferred embodiment, the present application can accurately simulate the dynamic contact behavior between the hollow rubber bushing and the suspension bracket by using a preset GAP gap unit and an initial gap value in the geometric model. When the movement distance of the rubber bushing is less than the initial gap value, the GAP unit remains separated, ensuring that the situation where there is no interaction between the two is correctly simulated in the simulation, thereby avoiding the force transmission error that may occur in the traditional model. When the movement distance of the rubber bushing exceeds the initial gap value, the GAP unit can accurately simulate the contact and force transmission between the two, ensuring that the simulation results can truly reflect the actual mechanical behavior. This dynamic simulation method improves the accuracy of the simulation analysis, allowing the simulation model to more reliably predict the stress distribution and deformation of the suspension bracket under different load conditions, providing strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0024] As a preferred embodiment of the first aspect, the three-dimensional stiffness characteristics of the hollow rubber bushing are simulated according to the preset Bushing unit, specifically:

[0025] The geometric model simulates the deformation and force transmission of the hollow rubber bushing when subjected to force according to the preset Bushing unit and the respective preset stiffness coefficients in the three directions of X, Y and Z.

[0026] In this preferred embodiment, the present application can accurately simulate the three-dimensional stiffness characteristics of the hollow rubber bushing when subjected to force by using preset Bushing units in the geometric model and setting the stiffness coefficients in the three directions of X, Y, and Z. The Bushing unit can accurately reflect the deformation and force transfer behavior of the rubber bushing in various directions based on these stiffness coefficients. This simulation method enables the simulation model to more realistically reflect the mechanical response of the rubber bushing in actual use, including compression, tension, and shear deformation in different directions. Therefore, the simulation results can more accurately predict the performance of the suspension bracket under different load conditions, improve the reliability and prediction accuracy of the simulation analysis, and provide strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0027] In a second aspect, the present application provides a simulation device for a suspension bracket. The simulation device for the suspension bracket includes a construction module and a simulation module;

[0028] The construction module is used to construct a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material;

[0029] Wherein, the preset GAP gap unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model;

[0030] The simulation module is used to simulate the geometric model according to preset boundary conditions, so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

[0031] This device uses two modules to divide the work and coordinate the work to better simulate the actual effect of the suspension bracket. This application uses preset software and grid division to construct a geometric model of the suspension bracket containing a hollow rubber bushing, and integrates preset GAP gap units, Bushing units and rigid materials in the model, which can realize accurate simulation analysis of the suspension bracket under different working conditions. The GAP gap unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the empty stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder, including support force and reaction force. By combining the characteristics of these preset units and materials, the simulation model can comprehensively and accurately simulate the stress conditions and mechanical behavior of the suspension bracket in actual use, thereby improving the reliability and prediction accuracy of the simulation analysis. This application solves the problem in the prior art that it is impossible to accurately simulate the performance of the suspension bracket in actual use.

[0032] As a preferred embodiment of the second aspect, the construction module is used to construct a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material, and also includes:

[0033] Replacing the bolts of the geometric model with preset beam units;

[0034] According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the contact force between the bolts of the actual suspension bracket and the bracket according to the preset beam unit.

[0035] In this preferred embodiment, the present application constructs a geometric model of a suspension bracket containing a hollow rubber bushing by using preset software and meshing, and integrates preset GAP gap units, Bushing units, rigid materials in the model, and replaces bolts with preset beam units, so as to realize accurate simulation analysis of the suspension bracket under different working conditions. The GAP gap unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder. In addition, replacing the bolts with preset beam units can simulate the flexible characteristics of the bolts, so that the simulation model can more accurately reflect the contact force conditions between the bolts and the bracket, avoiding the problem of inaccurate force transmission caused by directly coupling the bolt holes in the traditional model.

[0036] As a preferred embodiment of the second aspect, the geometric model is configured to simulate the separation state and contact state of the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit, specifically:

[0037] So that the geometric model simulates the initial gap and contact between the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit and the preset initial gap value;

[0038] If the moving distance of the hollow rubber bushing is less than the initial gap value, the simulation model simulates the separation state between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit;

[0039] If the moving distance of the hollow rubber bushing is greater than the initial gap value, the simulation model simulates the contact and force transmission between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit.

[0040] In this preferred embodiment, the present application can accurately simulate the dynamic contact behavior between the hollow rubber bushing and the suspension bracket by using a preset GAP gap unit and an initial gap value in the geometric model. When the movement distance of the rubber bushing is less than the initial gap value, the GAP unit remains separated, ensuring that the situation where there is no interaction between the two is correctly simulated in the simulation, thereby avoiding the force transmission error that may occur in the traditional model. When the movement distance of the rubber bushing exceeds the initial gap value, the GAP unit can accurately simulate the contact and force transmission between the two, ensuring that the simulation results can truly reflect the actual mechanical behavior. This dynamic simulation method improves the accuracy of the simulation analysis, allowing the simulation model to more reliably predict the stress distribution and deformation of the suspension bracket under different load conditions, providing strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0041] As a preferred embodiment of the second aspect, the three-dimensional stiffness characteristics of the hollow rubber bushing simulated by the preset Bushing unit are specifically:

[0042] The geometric model simulates the deformation and force transmission of the hollow rubber bushing when subjected to force according to the preset Bushing unit and the respective preset stiffness coefficients in the three directions of X, Y and Z.

[0043] In this preferred embodiment, the present application can accurately simulate the three-dimensional stiffness characteristics of the hollow rubber bushing when subjected to force by using preset Bushing units in the geometric model and setting the stiffness coefficients in the three directions of X, Y, and Z. The Bushing unit can accurately reflect the deformation and force transfer behavior of the rubber bushing in various directions based on these stiffness coefficients. This simulation method enables the simulation model to more realistically reflect the mechanical response of the rubber bushing in actual use, including compression, tension, and shear deformation in different directions. Therefore, the simulation results can more accurately predict the performance of the suspension bracket under different load conditions, improve the reliability and prediction accuracy of the simulation analysis, and provide strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0044] In a third aspect, the present application provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute a simulation method of a suspension bracket as described. The beneficial effect is the same as the simulation method of a suspension bracket provided in the first aspect of the present application.

[0045] In a fourth aspect, the present application provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements any one of the suspension bracket simulation methods described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 : A schematic diagram of a flow chart of an embodiment of a simulation method for a suspension bracket provided in the present application;

[0047] Figure 2 : A structural schematic diagram of an embodiment of a conventional suspension bracket structure provided in the present application;

[0048] Figure 3 : A structural schematic diagram of an embodiment of an area region node of a suspension bracket provided in the present application;

[0049] Figure 4 : A structural schematic diagram of an embodiment of the stress condition of the suspension provided in the present application;

[0050] Figure 5 : A structural schematic diagram of an embodiment of treating the cylinder support surface provided in the present application as a rigid body;

[0051] Figure 6 : A structural schematic diagram of an embodiment of simulating bolts using beam units provided in the present application;

[0052] Figure 7 : A structural schematic diagram of an embodiment of a simulation device for a suspension bracket provided in the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0054] Embodiment 1

[0055] Please refer to Figure 1 , which is a simulation method of a suspension bracket provided in an embodiment of the present invention.

[0056] In this embodiment, the process of the simulation method of the suspension bracket in the present application is described in detail through steps S01-S02.

[0057] In the past, the suspension was checked by building a dynamic model of the powertrain through Adams, and then calculating the forces of each suspension bracket through the general 28 working conditions. The forces were transmitted to CAE, and CAE applied the forces to the suspension points, such as Figure 2 The stress of each bracket is then extracted. We simplify the process of applying force to the suspension bracket. The traditional modeling has the following four problems: 1. The empty stroke problem of the hollow rubber is not considered. The area node coupling between RB3 and the rubber bushing projected to the bracket along the corresponding coordinate system is directly established, such as Figure 3 ; When subjected to force in a certain direction, due to the characteristics of RB3, the force will be evenly dispersed around the suspension bracket, which is inconsistent with the actual situation that only one side of the bracket is subjected to force, resulting in the simulated stress being less than the actual stress; 2. The rubber bushing is not brought into the model analysis, that is, the stiffness of the hollow rubber bushing is not considered, which is inconsistent with the actual situation: the loading force acts on the suspension through the rubber, and due to the damping characteristics of the rubber bushing, there will be a certain loss of force; 3. The boundary problem of the mounting surface bracket is not considered; 4. The flexibility of the mounting bolts is not considered, and the RB2 rigid coupling bolt hole is directly used; The above reasons cause the stress analysis results to be inconsistent with the actual situation and TIR cannot be reproduced.

[0058] In order to solve the problem of real-time changing force transmission in the strength analysis of hollow rubber bushings, that is, the hollow rubber bushing needs to go through a short idle stroke before it contacts the suspension bracket and generates force, the GAP gap unit is introduced in the modeling:

[0059] 1. GAP unit can be used to simulate the contact between two nodes. The nodes can be in contact state (gap closed) or in separation state (gap open) when the separation condition is met in a specific direction. This feature fully meets the current simulation needs: there is a gap between the rubber bushing and the suspension, and the gap length in each direction is set using the GAP unit. The GAP unit is a 1D unit. The starting point is connected to the bushing unit (a simulated alternative unit for the rubber bushing), and the end point is connected to the slave node projected to the suspension area by grabbing the rubber bushing with RB3. When the force causes the rubber bushing to move a distance less than the corresponding gap distance, the GAP unit is in a separation state, and no action occurs between the rubber bushing and the suspension; when the force causes the rubber bushing to move a distance greater than the corresponding gap distance, the GAP unit is in a closed state, and the force is transmitted to the slave node of RB3 through the rubber bushing, and then transmitted to the suspension through RB3, and then the stress of the suspension is analyzed, such as Figure 4 ;

[0060] 2. The suspension simulates the rubber bushing by giving it three-dimensional stiffness with the spring Bushing unit, which can realize the plastic behavior of six components. However, here we only consider the three directions of X / Y / Z. The Bushing unit is a 1D unit with spring and damping characteristics, which can be used to simulate connections with flexibility and damping behavior. Therefore, the Bushing unit can be used to define the rubber bushing, and the parameters such as the stiffness, damping and contact properties of the rubber bushing can be formulated. In this way, when the force is transmitted to the suspension through the rubber bushing, there will be a certain loss, making the constructed model closer to the actual situation.

[0061] 3. The bracket mounting surface boundary problem. The suspension bracket is installed on the cylinder body by bolts. In order to more realistically reflect the stress of the bracket, the cylinder body support surface is treated as a rigid body and contact is established, such as Figure 5 ;

[0062] 4. The flexibility of the mounting bolts is solved by using beam units to simulate the bolts. The force on the bracket is completely transmitted to the bracket through the contact surface between the bolts and the bracket, rather than the traditional way of directly coupling the bolt holes, such as Figure 6 .

[0063] S01: According to the preset software, preset mesh division, preset GAP gap unit, preset Bushing unit and preset rigid material, a geometric model of the suspension bracket containing the hollow rubber bushing is constructed;

[0064] The preset GAP unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model.

[0065] This application uses preset software and meshing to construct a geometric model of a suspension bracket containing a hollow rubber bushing, integrates preset GAP units, Bushing units, rigid materials in the model, and replaces bolts with preset beam units, so as to achieve accurate simulation analysis of the suspension bracket under different working conditions. The GAP unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder. In addition, replacing the bolts with preset beam units can simulate the flexible characteristics of the bolts, so that the simulation model can more accurately reflect the contact force conditions between the bolts and the bracket, avoiding the problem of inaccurate force transmission caused by directly coupling the bolt holes in the traditional model.

[0066] As a preferred embodiment of the first embodiment, the geometric model of the suspension bracket containing the hollow rubber bushing is constructed according to the preset software, the preset grid division, the preset GAP gap unit, the preset Bushing unit and the preset rigid material, specifically:

[0067] Step 1: Draw the mesh: 3mm first-order tetrahedral mesh C3D4 for castings, 3mm washer for bolt holes; the minimum unit cannot be less than 0.1mm. 5mm S4R unit for sheet metal;

[0068] Step 2: Create GAP cells

[0069] 1. Measure the gap between the suspension bracket and the rubber bushing;

[0070] 2. Create hard point coordinates. This point is the loading point. Then copy the point. At this time, there are two points at this position and they coincide (the hard point coordinates are provided by the chassis engineer)

[0071] 3. Build RB3 coupling on the contact surface of the rubber bushing on the projection of the suspension body;

[0072] 4. In the 1D-gaps card, create the +X direction gap unit GAPUNI;

[0073] 5. Create the gap unit attributes in the +X direction and assign the gap value in the X direction. The other directions are similar.

[0074] Step 3: Create Bushing Unit

[0075] 1. In the 1D-rbe3 card, update the slave node of the rubber base and reb3 coupling to merge into the loading point;

[0076] 2. On the 1D-rods card, create a connecting line between the loading point and the copy point. This line is the Bushing unit.

[0077] 4. In the Analysis-systems card, create a vehicle coordinate system (the three-dimensional stiffness of the Bushing unit later uses this coordinate system as a reference)

[0078] 5. Create Busing materials and properties, and assign X, Y, and Z stiffness (values ​​provided by the corresponding engineers)

[0079] Step 4: Create bolted connections

[0080] 1. Create a standard bolt with a diameter of 6mm;

[0081] 2. Take the center of the upper and lower holes of the two bolt holes of the suspension bracket, take a midpoint between the two centers, and establish a beam unit to simulate the bolt (this method takes into account the flexibility of the bolt, and the force of the bracket is completely transmitted to the bracket by the contact surface between the bolt and the bracket; instead of the traditional modeling method, which directly couples the bolt hole and does not consider the deformation of the screw itself;

[0082] Step 5: Establish contact pairs: introduce rigid body elements on the bracket mounting surface and create contact;

[0083] Step 6: Constrain the six degrees of freedom of the bolt hole, apply force at the loading point, and submit the model for calculation.

[0084] S02: According to preset boundary conditions, the geometric model is simulated so that the geometric model simulates the separation state and contact state between the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

[0085] As a preferred embodiment of the first embodiment, the geometric model is simulated according to the preset boundary conditions, so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, and simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, specifically:

[0086] GAP unit works as follows Figure 4As shown in the figure, after the GAP gap unit is introduced, the problem of real-time changing force transmission under the strength analysis of the hollow rubber bushing is solved. The bushing unit simulates the rubber bushing (yellow dot) and gives it X, Y, and Z stiffness. Take the rubber bushing subjected to +X force as an example: 1. When the rubber bushing is subjected to +X force, due to the distance of 3.2mm between the rubber bushing and the suspension bracket, when the moving distance is ≤3.2mm, there is no interaction between the rubber bushing and the suspension bracket; 2. When the moving distance is greater than 3.2mm, the suspension bracket is subjected to the force transmitted by the rubber, which is transmitted to the suspension bracket by grabbing the RB3 grabbed in the corresponding projection area of ​​the bracket in the +X direction, and then the stress situation in the corresponding area of ​​the bracket is analyzed, and the automatic judgment of the force transmission time in each direction is realized.

[0087] In this preferred embodiment, the present application can accurately simulate the dynamic contact behavior between the hollow rubber bushing and the suspension bracket by using the preset GAP gap unit and the initial gap value in the geometric model. When the moving distance of the rubber bushing is less than the initial gap value, the GAP unit remains separated to ensure that the situation of no interaction between the two is correctly simulated in the simulation, thereby avoiding the force transmission error that may occur in the traditional model. When the moving distance of the rubber bushing exceeds the initial gap value, the GAP unit can accurately simulate the contact and force transmission between the two, ensuring that the simulation results can truly reflect the actual mechanical behavior. This dynamic simulation method improves the accuracy of the simulation analysis, so that the simulation model can more reliably predict the stress distribution and deformation of the suspension bracket under different load conditions. At the same time, the present application can accurately simulate the three-way stiffness characteristics of the hollow rubber bushing when it is under force by using the preset Bushing unit in the geometric model and setting the stiffness coefficients in the three directions of X, Y, and Z. The Bushing unit can accurately reflect the deformation and force transmission behavior of the rubber bushing in all directions based on these stiffness coefficients. This simulation method enables the simulation model to more realistically reflect the mechanical response of the rubber bushing in actual use, including compression, tension and shear deformation in different directions. Therefore, the simulation results can more accurately predict the performance of the suspension bracket under different load conditions, improve the reliability and prediction accuracy of the simulation analysis, and provide strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0088] This application uses preset software and meshing to construct a geometric model of a suspension bracket containing a hollow rubber bushing, and integrates preset GAP units, Bushing units and rigid materials in the model, which can achieve accurate simulation analysis of the suspension bracket under different working conditions. The GAP unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder, including support force and reaction force. By combining the characteristics of these preset units and materials, the simulation model can comprehensively and accurately simulate the stress conditions and mechanical behavior of the suspension bracket in actual use, thereby improving the reliability and prediction accuracy of the simulation analysis. This application solves the problem in the prior art that it is impossible to accurately simulate the performance of the suspension bracket in actual use.

[0089] Embodiment 2

[0090] Please refer to Figure 7 , which is a simulation device of a suspension bracket provided in an embodiment of the present application.

[0091] In this embodiment, the simulation device of the suspension bracket includes a construction module 10 and a simulation module 20 .

[0092] In the past, the suspension was checked by building a dynamic model of the powertrain through Adams, and then calculating the forces of each suspension bracket through the general 28 working conditions. The forces were transmitted to CAE, and CAE applied the forces to the suspension points, such as Figure 2 The stress of each bracket is then extracted. We simplify the process of applying force to the suspension bracket. The traditional modeling has the following four problems: 1. The empty stroke problem of the hollow rubber is not considered. The area node coupling between RB3 and the rubber bushing projected to the bracket along the corresponding coordinate system is directly established, such as Figure 3; When subjected to force in a certain direction, due to the characteristics of RB3, the force will be evenly dispersed around the suspension bracket, which is inconsistent with the actual situation that only one side of the bracket is subjected to force, resulting in the simulated stress being less than the actual stress; 2. The rubber bushing is not brought into the model analysis, that is, the stiffness of the hollow rubber bushing is not considered, which is inconsistent with the actual situation: the loading force acts on the suspension through the rubber, and due to the damping characteristics of the rubber bushing, there will be a certain loss of force; 3. The boundary problem of the mounting surface bracket is not considered; 4. The flexibility of the mounting bolts is not considered, and the RB2 rigid coupling bolt hole is directly used; The above reasons cause the stress analysis results to be inconsistent with the actual situation and TIR cannot be reproduced.

[0093] In order to solve the problem of real-time changing force transmission in the strength analysis of hollow rubber bushings, that is, the hollow rubber bushing needs to go through a short idle stroke before it contacts the suspension bracket and generates force, the GAP gap unit is introduced in the modeling:

[0094] 1. GAP unit can be used to simulate the contact between two nodes. The nodes can be in contact state (gap closed) or in separation state (gap open) when the separation condition is met in a specific direction. This feature fully meets the current simulation needs: there is a gap between the rubber bushing and the suspension, and the gap length in each direction is set using the GAP unit. The GAP unit is a 1D unit. The starting point is connected to the bushing unit (a simulated alternative unit for the rubber bushing), and the end point is connected to the slave node projected to the suspension area by grabbing the rubber bushing with RB3. When the force causes the rubber bushing to move a distance less than the corresponding gap distance, the GAP unit is in a separation state, and no action occurs between the rubber bushing and the suspension; when the force causes the rubber bushing to move a distance greater than the corresponding gap distance, the GAP unit is in a closed state, and the force is transmitted to the slave node of RB3 through the rubber bushing, and then transmitted to the suspension through RB3, and then the stress of the suspension is analyzed, such as Figure 4 ;

[0095] 2. The suspension simulates the rubber bushing by giving it three-dimensional stiffness with the spring Bushing unit, which can realize the plastic behavior of six components. However, here we only consider the three directions of X / Y / Z. The Bushing unit is a 1D unit with spring and damping characteristics, which can be used to simulate connections with flexibility and damping behavior. Therefore, the Bushing unit can be used to define the rubber bushing, and the parameters such as the stiffness, damping and contact properties of the rubber bushing can be formulated. In this way, when the force is transmitted to the suspension through the rubber bushing, there will be a certain loss, making the constructed model closer to the actual situation.

[0096] 3. The bracket mounting surface boundary problem. The suspension bracket is installed on the cylinder body by bolts. In order to more realistically reflect the stress of the bracket, the cylinder body support surface is treated as a rigid body and contact is established, such as Figure 5 ;

[0097] 4. The flexibility of the mounting bolts is solved by using beam units to simulate the bolts. The force on the bracket is completely transmitted to the bracket through the contact surface between the bolts and the bracket, rather than the traditional way of directly coupling the bolt holes, such as Figure 6 .

[0098] The construction module 10 is used to construct a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material;

[0099] The preset GAP unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model.

[0100] This application uses preset software and meshing to construct a geometric model of a suspension bracket containing a hollow rubber bushing, integrates preset GAP units, Bushing units, rigid materials in the model, and replaces bolts with preset beam units, so as to achieve accurate simulation analysis of the suspension bracket under different working conditions. The GAP unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder. In addition, replacing the bolts with preset beam units can simulate the flexible characteristics of the bolts, so that the simulation model can more accurately reflect the contact force conditions between the bolts and the bracket, avoiding the problem of inaccurate force transmission caused by directly coupling the bolt holes in the traditional model.

[0101] As a preferred embodiment of the second embodiment, the geometric model of the suspension bracket containing the hollow rubber bushing is constructed according to the preset software, the preset grid division, the preset GAP gap unit, the preset Bushing unit and the preset rigid material, specifically:

[0102] Step 1: Draw the mesh: 3mm first-order tetrahedral mesh C3D4 for castings, 3mm washer for bolt holes; the minimum unit cannot be less than 0.1mm. 5mm S4R unit for sheet metal;

[0103] Step 2: Create GAP cells

[0104] 1. Measure the gap between the suspension bracket and the rubber bushing;

[0105] 2. Create hard point coordinates. This point is the loading point. Then copy the point. At this time, there are two points at this position and they coincide (the hard point coordinates are provided by the chassis engineer)

[0106] 3. Build RB3 coupling on the contact surface of the rubber bushing on the projection of the suspension body;

[0107] 4. In the 1D-gaps card, create the +X direction gap unit GAPUNI;

[0108] 5. Create the gap unit attributes in the +X direction and assign the gap value in the X direction. The other directions are similar.

[0109] Step 3: Create Bushing Unit

[0110] 1. In the 1D-rbe3 card, update the slave node of the rubber base and reb3 coupling to merge into the loading point;

[0111] 2. On the 1D-rods card, create a connecting line between the loading point and the copy point. This line is the Bushing unit.

[0112] 4. In the Analysis-systems card, create a vehicle coordinate system (the three-dimensional stiffness of the Bushing unit later uses this coordinate system as a reference)

[0113] 5. Create Busing materials and properties, and assign X, Y, and Z stiffness (values ​​provided by the corresponding engineers)

[0114] Step 4: Create bolted connections

[0115] 1. Create a standard bolt with a diameter of 6mm;

[0116] 2. Take the center of the upper and lower holes of the two bolt holes of the suspension bracket, take a midpoint between the two centers, and establish a beam unit to simulate the bolt (this method takes into account the flexibility of the bolt, and the force of the bracket is completely transmitted to the bracket by the contact surface between the bolt and the bracket; instead of the traditional modeling method, which directly couples the bolt hole and does not consider the deformation of the screw itself;

[0117] Step 5: Establish contact pairs: introduce rigid body elements on the bracket mounting surface and create contact;

[0118] Step 6: Constrain the six degrees of freedom of the bolt hole, apply force at the loading point, and submit the model for calculation.

[0119] The simulation module 20 is used to simulate the geometric model according to preset boundary conditions, so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

[0120] As a preferred embodiment of the second embodiment, the geometric model is simulated according to the preset boundary conditions, so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, and simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, specifically:

[0121] GAP unit works as follows Figure 4 As shown in the figure, after the GAP gap unit is introduced, the problem of real-time changing force transmission under the strength analysis of the hollow rubber bushing is solved. The bushing unit simulates the rubber bushing (yellow dot) and gives it X, Y, and Z stiffness. Take the rubber bushing subjected to +X force as an example: 1. When the rubber bushing is subjected to +X force, due to the distance of 3.2mm between the rubber bushing and the suspension bracket, when the moving distance is ≤3.2mm, there is no interaction between the rubber bushing and the suspension bracket; 2. When the moving distance is greater than 3.2mm, the suspension bracket is subjected to the force transmitted by the rubber, which is transmitted to the suspension bracket by grabbing the RB3 grabbed in the corresponding projection area of ​​the bracket in the +X direction, and then the stress situation in the corresponding area of ​​the bracket is analyzed, and the automatic judgment of the force transmission time in each direction is realized.

[0122] In this preferred embodiment, the present application can accurately simulate the dynamic contact behavior between the hollow rubber bushing and the suspension bracket by using the preset GAP gap unit and the initial gap value in the geometric model. When the moving distance of the rubber bushing is less than the initial gap value, the GAP unit remains separated to ensure that the situation of no interaction between the two is correctly simulated in the simulation, thereby avoiding the force transmission error that may occur in the traditional model. When the moving distance of the rubber bushing exceeds the initial gap value, the GAP unit can accurately simulate the contact and force transmission between the two, ensuring that the simulation results can truly reflect the actual mechanical behavior. This dynamic simulation method improves the accuracy of the simulation analysis, so that the simulation model can more reliably predict the stress distribution and deformation of the suspension bracket under different load conditions. At the same time, the present application can accurately simulate the three-way stiffness characteristics of the hollow rubber bushing when it is under force by using the preset Bushing unit in the geometric model and setting the stiffness coefficients in the three directions of X, Y, and Z. The Bushing unit can accurately reflect the deformation and force transmission behavior of the rubber bushing in all directions based on these stiffness coefficients. This simulation method enables the simulation model to more realistically reflect the mechanical response of the rubber bushing in actual use, including compression, tension and shear deformation in different directions. Therefore, the simulation results can more accurately predict the performance of the suspension bracket under different load conditions, improve the reliability and prediction accuracy of the simulation analysis, and provide strong technical support for the design optimization and performance evaluation of the suspension bracket.

[0123] This application uses preset software and meshing to construct a geometric model of a suspension bracket containing a hollow rubber bushing, and integrates preset GAP units, Bushing units and rigid materials in the model, which can achieve accurate simulation analysis of the suspension bracket under different working conditions. The GAP unit is located on the contact interface between the hollow rubber bushing and the suspension bracket, which can simulate the separation and contact state between the two, thereby accurately capturing the dynamic behavior of the rubber bushing when subjected to force, and solving the simulation result deviation caused by ignoring the idle stroke problem in the traditional model. The Bushing unit is embedded in the hollow rubber bushing to simulate its three-dimensional stiffness characteristics, so that the simulation model can truly reflect the mechanical response of the rubber bushing in all directions, and improve the simulation accuracy of the deformation and force transmission of the rubber bushing. The rigid material is located in the cylinder of the suspension bracket to simulate the rigid support characteristics of the actual cylinder, ensuring that the simulation results can accurately reflect the interaction force between the suspension bracket and the cylinder, including support force and reaction force. By combining the characteristics of these preset units and materials, the simulation model can comprehensively and accurately simulate the stress conditions and mechanical behavior of the suspension bracket in actual use, thereby improving the reliability and prediction accuracy of the simulation analysis. This application solves the problem in the prior art that it is impossible to accurately simulate the performance of the suspension bracket in actual use.

[0124] Embodiment three:

[0125] An embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the simulation method of a suspension bracket;

[0126] Wherein, if the simulation method of a suspension bracket is implemented in the form of a software functional unit and used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0127] Embodiment 4

[0128] The present application provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements any one of the suspension bracket simulation methods described in Example 1.

[0129] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for simulating a suspension bracket, characterized in that: include: According to the preset software, preset mesh division, preset GAP gap unit, preset Bushing unit and preset rigid material, a geometric model of the suspension bracket containing the hollow rubber bushing is constructed; Wherein, the preset GAP gap unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model; According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

2. The simulation method of the suspension bracket according to claim 1, characterized in that: The method of constructing a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material also includes: Replacing the bolts of the geometric model with preset beam units; According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the contact force between the bolts of the actual suspension bracket and the bracket according to the preset beam unit.

3. The simulation method of the suspension bracket according to claim 1, characterized in that: The method is to enable the geometric model to simulate the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, specifically: So that the geometric model simulates the initial gap and contact between the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit and the preset initial gap value; If the moving distance of the hollow rubber bushing is less than the initial gap value, the simulation model simulates the separation state between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit; If the moving distance of the hollow rubber bushing is greater than the initial gap value, the simulation model simulates the contact and force transmission between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit.

4. The simulation method of the suspension bracket according to claim 1, characterized in that: The three-dimensional stiffness characteristics of the hollow rubber bushing are simulated according to the preset Bushing unit, specifically: The geometric model simulates the deformation and force transmission of the hollow rubber bushing when subjected to force according to the preset Bushing unit and the respective preset stiffness coefficients in the three directions of X, Y and Z.

5. A simulation device for a suspension bracket, characterized in that: Includes building blocks and simulation modules; The construction module is used to construct a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material; Wherein, the preset GAP gap unit is located on the contact interface between the hollow rubber bushing of the geometric model and the suspension bracket, the preset Bushing unit is embedded in the hollow rubber bushing of the geometric model, and the rigid material is located in the cylinder of the suspension bracket of the geometric model; The simulation module is used to simulate the geometric model according to preset boundary conditions, so that the geometric model simulates the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, simulates the three-dimensional stiffness characteristics of the hollow rubber bushing according to the preset Bushing unit, and simulates the interaction force between the actual suspension bracket and the actual cylinder body according to the preset rigid material.

6. The simulation device for a suspension bracket according to claim 1, characterized in that: The construction module is used to construct a geometric model of a suspension bracket containing a hollow rubber bushing according to preset software, preset grid division, preset GAP gap unit, preset Bushing unit and preset rigid material, and also includes: Replacing the bolts of the geometric model with preset beam units; According to the preset boundary conditions, the geometric model is simulated so that the geometric model simulates the contact force between the bolts of the actual suspension bracket and the bracket according to the preset beam unit.

7. The simulation device for the suspension bracket according to claim 5, characterized in that: The method is to enable the geometric model to simulate the separation state and contact state of the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit, specifically: So that the geometric model simulates the initial gap and contact between the hollow rubber bushing and the suspension bracket according to the preset GAP gap unit and the preset initial gap value; If the moving distance of the hollow rubber bushing is less than the initial gap value, the simulation model simulates the separation state between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit; If the moving distance of the hollow rubber bushing is greater than the initial gap value, the simulation model simulates the contact and force transmission between the hollow rubber bushing and the suspension bracket according to a preset GAP gap unit.

8. The simulation device for the suspension bracket according to claim 5, characterized in that: The three-dimensional stiffness characteristics of the hollow rubber bushing are simulated according to the preset Bushing unit, specifically: The geometric model simulates the deformation and force transmission of the hollow rubber bushing when subjected to force according to the preset Bushing unit and the respective preset stiffness coefficients in the three directions of X, Y and Z.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the simulation method of the suspension bracket according to any one of claims 1 to 4.

10. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the simulation method of the suspension bracket according to any one of claims 1 to 4 when executing the computer program.

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