A method for improving the simulation accuracy of the strength and durability of the transverse stabilizer bar cover plate

Abstract

The present invention belongs to the technical field of suspension system durability simulation, and specifically relates to a method for improving the durability simulation accuracy of the strength of the lateral stabilizer bar cover plate; establishing a multi-body dynamics model of the suspension system, applying reverse displacements at the wheel centers on both sides, and calculating the loads at the rubber bushings; modeling the cover plate, fixing bolts, and subframe, restricting the 1-6 degrees of freedom of the connection points between the subframe and the vehicle body, and applying bolt pre-tightening forces; applying uniform loads to distinguish between vertical cover plates and flat-laying cover plates, and calculating the stress results based on the FEMFAT software as the upper and lower limits of the stress cycle, inputting the number of cycles, calculating the damage of the lateral stabilizer bar cover plate, and compiling a calculation and analysis report on the strength and durability of the lateral stabilizer bar cover plate; this method can more accurately calculate the stress, strain, and damage of the lateral stabilizer bar cover plate under the two layout modes, correctly guide the design of various types of lateral stabilizer bar cover plates, and enable their strength and durability performance to meet the standards at one time.

Description

Technical Field

[0001] The present invention belongs to the technical field of suspension system durability simulation, and particularly relates to a method for improving the durability simulation accuracy of the transverse stabilizer bar cover plate strength. Background Art

[0002] There are generally two layout methods for the transverse stabilizer bar cover plate in various suspension systems: 1. Vertical layout; 2. Flat layout.

[0003] Among them, the vertical layout method of the transverse stabilizer bar cover plate is as shown in Figure 1 shown, and the flat layout method is as shown in Figure 2 shown. The stress state of the transverse stabilizer bar cover plate is explained as follows: When the left (right) wheel jumps up and the right (left) wheel jumps down, that is, in the wheel rebound condition, the wheel on the side that jumps up will drive the corresponding stabilizer bar end to move upward, and the wheel on the side that jumps down will drive the corresponding stabilizer bar end to move downward. At this time, the stabilizer bar is in a torsional state, and the torsional stabilizer bar transmits the load to different areas of the stabilizer bar cover plate through the rubber bushing. The situation where the left wheel jumps up while the right wheel jumps down is a load condition for the stabilizer bar cover plate, which is abbreviated as Case1, and the situation where the left wheel jumps down while the right wheel jumps up is another load condition for the stabilizer bar cover plate, which is abbreviated as Case2. After the two load conditions cycle, the stress calculation results of the load conditions are imported into the FEMFAT software, and the number of cycles is input to calculate the durability damage of the stabilizer bar cover plate.

[0004] Currently, when performing the strength and durability analysis of the stabilizer bar cover plate, the cover plate mesh model is divided, the material nonlinear property is assigned, the 1-6 degrees of freedom of the bolt fixing points between the cover plate and the subframe are constrained, and the load obtained by multi-body dynamics decomposition is applied at the center point of the cover plate rubber bushing. The load is applied to the stabilizer bar cover plate through the uniform load unit Rbe3. As shown in Figure 3 shown.

[0005] The current strength and durability calculation method of the stabilizer bar cover plate has the following three problems: 1. It does not distinguish between the vertical layout and the flat layout of the stabilizer bar cover plate, and uniformly applies the load evenly to the contact area between the rubber bushing and the cover plate, that is, there is a problem with the loading position; 2. When the stress calculation results are imported into the FEMFAT software for damage calculation, there are problems with the stress results of Case1 and Case2 imported; 3. Constraining the 1-6 degrees of freedom of the two bolt fixing points limits the relative displacement between the two constraint points, and there is a problem with the constraint method. The above three problems will all affect the strength and durability calculation accuracy of the stabilizer bar cover plate.

[0006] In summary, when calculating the strength and durability performance of the lateral stabilizer bar cover plates in these two arrangements currently, due to the unreasonable modeling method and loading method, the lateral stabilizer bar cover plates cannot reflect the true stress and strain under their working conditions, thus affecting the development of the structural strength and durability performance. Summary of the Invention

[0007] To overcome the above problems, the present invention provides a method for improving the simulation accuracy of the strength and durability of the lateral stabilizer bar cover plate, which is a correct and reasonable modeling, constraint, loading and durability damage calculation method, and at the same time solves the problems existing in the current strength and durability calculation of the stabilizer bar cover plate, ensuring the development of the strength and durability performance of the cover plate.

[0008] A method for improving the simulation accuracy of the strength and durability of the lateral stabilizer bar cover plate includes the following contents:

[0009] In the first step, use the multi-body dynamics software Adams / Car to establish a multi-body dynamics model of the suspension system, and apply reverse wheel hop displacements at the wheel centers on both sides; when calculating the torsion of the lateral stabilizer bar, calculate the uniform load at the rubber bushing on the lateral stabilizer bar cover plate.

[0010] In the second step, import the geometric models of the lateral stabilizer bar cover plate, fixing bolts and subframe into the HyperMesh software, and perform mesh division, and then assign non-linear material properties to the lateral stabilizer bar cover plate, fixing bolts and subframe.

[0011] In the third step, establish the contact relationship between the fixing bolts and the lateral stabilizer bar cover plate, establish the bonded contact relationship between the fixing bolts and the subframe, and establish the contact relationship between the lateral stabilizer bar cover plate and the subframe.

[0012] In the fourth step, constrain the 1-6 degrees of freedom of the connection points between the subframe and the body, and apply bolt pre-tightening force.

[0013] In the fifth step, if the analyzed lateral stabilizer bar cover plate is a vertical cover plate, when the stabilizer bar end jumps up, apply the corresponding uniform load obtained in the first step to the upper half of the lateral stabilizer bar cover plate; when the stabilizer bar end jumps down, apply the corresponding uniform load obtained in the first step to the lower half of the lateral stabilizer bar cover plate.

[0014] Import the calculation files of the two working conditions of jumping up and down into the ABAQUS software respectively for stress result calculation, and then import the calculated stress results of the lateral stabilizer bar cover plate in the two working conditions of jumping up and down as the upper and lower limits of the stress cycle into the FEMFAT fatigue analysis software respectively.

[0015] If the analyzed lateral stabilizer bar cover plate is a flat cover plate, when the stabilizer bar end jumps up, apply the corresponding uniform load obtained in the first step to the upper half of the lateral stabilizer bar cover plate.

[0016] Import the calculation file of the upward jump condition into the ABAQUS software to calculate the stress results. Then, import the calculated result of the stress of the transverse stabilizer bar cover plate in the upward jump condition as the upper limit of the stress cycle into the FEMFAT fatigue analysis software, and set the lower limit of the stress cycle to zero in the FEMFAT fatigue analysis software.

[0017] In the sixth step, input the number of cycles in the FEMFAT fatigue analysis software, calculate the fatigue damage of the transverse stabilizer bar cover plate, and prepare a calculation and analysis report.

[0018] In the first step, if the transverse stabilizer bar cover plate in the multi-body dynamics model of the suspension system is a vertical cover plate, calculate the uniform load on the upper half of the rubber bushing when the end of the stabilizer bar jumps upward and the uniform load on the lower half of the rubber bushing when the end of the stabilizer bar jumps downward, respectively.

[0019] In the first step, if the transverse stabilizer bar cover plate in the multi-body dynamics model of the suspension system is a flat cover plate, calculate the uniform load on the upper half of the rubber bushing when the end of the stabilizer bar jumps upward.

[0020] In the fifth step, the calculation files for the upward jump and downward jump conditions refer to the data files exported from the Hypermesh software that can be used by the ABAQUS software to calculate stress results. The files contain the mesh information, property information, and loading information of the transverse stabilizer bar cover plate, fixed bolts, and subframe geometric model.

[0021] In the fifth step, the calculation file for the upward jump condition refers to the data file exported from the Hypermesh software that can be used by the ABAQUS software to calculate stress results. The file contains the mesh information, property information, and the uniform load and bolt pre-tightening force information of the transverse stabilizer bar cover plate, fixed bolts, and subframe geometric model.

[0022] Advantages of the present invention:

[0023] This method can more accurately calculate the stress, strain, and damage of the transverse stabilizer bar cover plate under two layout methods, correctly guide the design of various transverse stabilizer bar cover plates, and enable their strength and durability performance to meet the standards at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings to be used in the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings.

[0025] Figure 1This is a schematic diagram of the load transfer of the vertical stabilizer bar cover plate of the present invention.

[0026] Figure 2 This is a partial detail diagram of the load transfer of the vertical stabilizer bar cover plate of the present invention.

[0027] Figure 3 This is a schematic diagram of the load transfer of the flat-laid stabilizer bar cover plate of the present invention.

[0028] Figure 4 This is a partial detail diagram of the load transfer of the flat-laid stabilizer bar cover plate of the present invention.

[0029] Figure 5 This is a schematic diagram of the constrained loading for the strength calculation of the flat-laid stabilizer bar cover plate of the present invention.

[0030] Figure 6 This is a schematic diagram of the constrained loading for the strength calculation of the vertical stabilizer bar cover plate of the present invention Figure 1 。

[0031] Figure 7 This is a schematic diagram of the constrained loading for the strength calculation of the vertical stabilizer bar cover plate of the present invention Figure 2 。 Detailed implementation manners

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0033] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] Embodiment 1

[0037] A method for improving the simulation accuracy of the strength and durability of the transverse stabilizer bar cover plate includes the following contents:

[0038] The first step is to use the multi-body dynamics software Adams / Car to establish a multi-body dynamics model of the suspension system. Reverse wheel hop displacements are applied at the wheel centers on both sides. When the left wheel center moves upward, it will drive the transverse stabilizer bar end on the same side to move upward. When the right wheel center moves downward, it will drive the transverse stabilizer bar end on the same side to move downward. That is, when the transverse stabilizer bar twists, the load will be transmitted to the transverse stabilizer bar cover plate through the bushing; calculate the uniform load at the rubber bushing of the transverse stabilizer bar cover plate when the transverse stabilizer bar twists.

[0039] Figure 1 Figure Figure 2 , Figure 3 is a schematic diagram of the load transfer path when the transverse stabilizer bar cover plate with a vertical layout has the transverse stabilizer bar end moving up and down. For local details, see Figure 4 . From the local details of the vertically arranged cover plate Figure 2 , it can be seen that when the transverse stabilizer bar end 1 moves upward, the load will be evenly transmitted to the upper half of the transverse stabilizer bar cover plate through the upper half of the bushing, rather than the entire contact area between the bushing and the transverse stabilizer bar cover plate. Similarly, when the transverse stabilizer bar end 1 moves downward, the load will be evenly transmitted to the lower half of the transverse stabilizer bar cover plate through the lower half of the bushing, rather than the entire contact area between the bushing and the transverse stabilizer bar cover plate. From the local details of the flat-laid cover plate Figure 4 , it can be seen that when the transverse stabilizer bar end 1 moves upward, the load will be evenly transmitted to the upper half of the transverse stabilizer bar cover plate through the upper half of the bushing, rather than the entire contact area between the bushing and the transverse stabilizer bar cover plate. When the transverse stabilizer bar end 1 moves downward, the load will be evenly transmitted to the subframe through the lower half of the bushing, and the acting load on the transverse stabilizer bar cover plate is zero.

[0040] Step 2: Import the geometric models of the lateral stabilizer bar cover plate, fixing bolts, and subframe into Hypermesh software, perform mesh generation, and then assign non-linear material properties to the lateral stabilizer bar cover plate, fixing bolts, and subframe;

[0041] Step 3: Establish the contact relationship between the fixing bolts and the lateral stabilizer bar cover plate, establish the bonded contact relationship between the fixing bolts and the subframe, and establish the contact relationship between the lateral stabilizer bar cover plate and the subframe;

[0042] Step 4: Constrain the 1-6 degrees of freedom of the connection points between the subframe and the vehicle body, as shown in Figure 4 、 5 、6, and 7, and apply bolt pre-tightening force;

[0043] Step 5: If the analyzed lateral stabilizer bar cover plate is a vertical cover plate, when the stabilizer bar end jumps upward, apply the corresponding uniformly distributed load obtained in Step 1 to the upper half of the lateral stabilizer bar cover plate; when the stabilizer bar end jumps downward, apply the corresponding uniformly distributed load obtained in Step 1 to the lower half of the lateral stabilizer bar cover plate.

[0044] Import the calculation files of the upward jump and downward jump conditions into ABAQUS software respectively to calculate the stress results, and then import the stress calculation results of the lateral stabilizer bar cover plate obtained from the upward jump and downward jump conditions into FEMFAT fatigue analysis software as the upper and lower limits of the stress cycle respectively;

[0045] If the analyzed lateral stabilizer bar cover plate is a flat cover plate, when the stabilizer bar end jumps upward, apply the corresponding uniformly distributed load obtained in Step 1 to the upper half of the lateral stabilizer bar cover plate;

[0046] Import the calculation file of the upward jump condition into ABAQUS software to calculate the stress result, and then import the stress calculation result of the lateral stabilizer bar cover plate obtained from the upward jump condition into FEMFAT fatigue analysis software as the upper limit of the stress cycle, and set the lower limit of the stress cycle to zero in the FEMFAT fatigue analysis software;

[0047] Because when the stabilizer bar end jumps downward, the load does not act on the cover plate but on the subframe, as shown in Figure 4 、 5 、6, and 7;

[0048] Step 6: Input the number of cycles in the FEMFAT fatigue analysis software, calculate the fatigue damage of the lateral stabilizer bar cover plate, and compile a calculation and analysis report.

[0049] In the first step, if the transverse stabilizer bar cover plate in the multi-body dynamics model of the suspension system is a vertical cover plate, calculate the uniform load on the upper half of the rubber bushing when the stabilizer bar end jumps upward and the uniform load on the lower half of the rubber bushing when the stabilizer bar end jumps downward respectively.

[0050] In the first step, if the transverse stabilizer bar cover plate in the multi-body dynamics model of the suspension system is a flat cover plate, calculate the uniform load on the upper half of the rubber bushing when the stabilizer bar end jumps upward.

[0051] In the fifth step, the calculation files for the two conditions of upward jump and downward jump refer to the data files exported from the Hypermesh software that can be used by the ABAQUS software to calculate the stress results. The files contain the mesh information, property information, and loading information of the transverse stabilizer bar cover plate, fixed bolts, and subframe geometric model.

[0052] In the fifth step, the calculation file for the upward jump condition refers to the data file exported from the Hypermesh software that can be used by the ABAQUS software to calculate the stress results. The file contains the mesh information, property information, and the uniform load and bolt pre-tightening force information applied to the transverse stabilizer bar cover plate, fixed bolts, and subframe geometric model.

[0053] Embodiment 2

[0054] A method for improving the simulation accuracy of the strength and durability of the transverse stabilizer bar cover plate includes the following contents:

[0055] When calculating the strength and durability of the stabilizer bar cover plate, it is first necessary to establish a multi-body dynamics model of the suspension system, apply reverse displacements at the wheel centers on both sides, that is, the reverse wheel hop condition, and calculate the loads at the rubber bushings of the stabilizer bar cover plate when the stabilizer bar is twisted. Secondly, mesh the stabilizer bar cover plate, fixing bolts, and subframe, and endow them with material non-linear properties. At the same time, establish the contact relationship between the fixing bolts and the stabilizer bar cover plate, the bonded contact relationship between the fixing bolts and the subframe, and the contact relationship between the stabilizer bar cover plate and the subframe. Thirdly, constrain the 1-6 degrees of freedom of the connection points between the subframe and the body and apply bolt pre-tightening forces. Thirdly, distinguish between vertical cover plates and flat-laid cover plates. If it is a vertically arranged stabilizer bar cover plate, the uniform loads are applied to the upper half and the lower half of the cover plate respectively. If it is a flat-laid stabilizer bar cover plate, the uniform load is only applied to the upper half of the stabilizer bar cover plate. Thirdly, submit the calculation file. Finally, when calculating the durability damage of the stabilizer bar cover plate, it is also necessary to consider the layout method of the stabilizer bar cover plate. If it is a vertically arranged stabilizer bar cover plate, based on the FEMFAT software, import the stress results of the uniform load acting on the upper half and the lower half of the stabilizer bar cover plate respectively, use them as the upper and lower limits of the stress cycle, input the number of cycles, and calculate the damage of the stabilizer bar cover plate. If it is a flat-laid stabilizer bar cover plate, only import the stress result of the uniform load acting on the upper half of the stabilizer bar cover plate as the upper limit, the lower limit stress is zero, input the number of cycles, and calculate the damage of the stabilizer bar cover plate, and prepare an analysis report on the strength and durability calculation of the stabilizer bar cover plate.

[0056] In this method, for stabilizer bar cover plates with different layout methods, the positions where the uniform loads are applied are different. For vertically arranged cover plates, when the stabilizer bar ends move up and down, the uniform loads are applied to the upper half and the lower half of the cover plate respectively, rather than the entire contact area between the bushing and the cover plate. For flat-laid cover plates, the uniform load is only applied to the upper half of the cover plate, rather than the entire contact area between the bushing and the cover plate.

[0057] When calculating the durability damage, it is also necessary to distinguish the layout method of the cover plate. For vertically arranged cover plates, import the stress results of the uniform load acting on the upper half and the lower half of the cover plate into the FEMFAT software respectively, use them as the upper and lower limits of the stress cycle, and input the number of cycles to calculate the damage. For flat-laid cover plates, only import the stress result of the uniform load acting on the upper half of the cover plate, use it as the upper limit of the stress cycle, the lower limit is zero, input the number of cycles, and calculate the damage.

[0058] When calculating the strength and durability damage of the cover plate, consider the bolt pre-tightening force.

[0059] When calculating the strength and durability damage of the cover plate, constrain the 1-6 degrees of freedom of the connection points between the subframe and the body, and release the deformation at the fixing bolts of the cover plate.

[0060] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any person skilled in the art within the technical scope disclosed by the present invention can make equivalent substitutions or changes according to the technical solution and inventive concept of the present invention, and these simple variations all fall within the protection scope of the present invention.

[0061] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0062] Furthermore, any arbitrary combination can be made among the various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A method for improving the simulation accuracy of the strength and durability of the transverse stabilizer bar cover plate, characterized in that It includes the following contents: In the first step, use the multi-body dynamics software Adams / Car to establish a multi-body dynamics model of the suspension system, and apply reverse wheel hop displacements at the wheel centers on both sides; when calculating the torsion of the anti-roll bar, calculate the uniform load at the rubber bushing on the anti-roll bar cover plate. In the second step, import the geometric models of the anti-roll bar cover plate, fixing bolts and subframe into Hypermesh software, perform mesh division, and then assign non-linear material properties to the anti-roll bar cover plate, fixing bolts and subframe. In the third step, establish the contact relationship between the fixing bolts and the anti-roll bar cover plate, establish the bonded contact relationship between the fixing bolts and the subframe, and establish the contact relationship between the anti-roll bar cover plate and the subframe. In the fourth step, constrain the 1-6 degrees of freedom of the connection points between the subframe and the body, and apply bolt pre-tightening force. In the fifth step, if the analyzed anti-roll bar cover plate is a vertical cover plate, when the anti-roll bar end jumps up, apply the corresponding uniform load obtained in the first step to the upper half of the anti-roll bar cover plate; when the anti-roll bar end jumps down, apply the corresponding uniform load obtained in the first step to the lower half of the anti-roll bar cover plate. Import the calculation files of the two working conditions of jumping up and down into ABAQUS software respectively to calculate the stress results, and then import the calculated stress results of the anti-roll bar cover plate in the two working conditions of jumping up and down as the upper and lower limits of the stress cycle into the FEMFAT fatigue analysis software respectively. If the analyzed anti-roll bar cover plate is a flat cover plate, when the anti-roll bar end jumps up, apply the corresponding uniform load obtained in the first step to the upper half of the anti-roll bar cover plate. Import the calculation file of the jumping-up working condition into ABAQUS software to calculate the stress result, and then import the calculated stress result of the anti-roll bar cover plate in the jumping-up working condition as the upper limit of the stress cycle into the FEMFAT fatigue analysis software, and set the lower limit of the stress cycle to zero in the FEMFAT fatigue analysis software. In the sixth step, input the number of cycles in the FEMFAT fatigue analysis software, calculate the fatigue damage of the anti-roll bar cover plate, and compile a calculation and analysis report.

2. The method for improving the strength and durability simulation accuracy of the lateral stabilizer bar cover plate according to claim 1, characterized in that In the first step, if the anti-roll bar cover plate in the multi-body dynamics model of the suspension system is a vertical cover plate, calculate the uniform load on the upper half of the rubber bushing when the anti-roll bar end jumps up and the uniform load on the lower half of the rubber bushing when the anti-roll bar end jumps down respectively.

3. A method for improving the strength and durability simulation accuracy of a lateral stabilizer bar cover plate according to claim 1, characterized in that In the first step, if the anti-roll bar cover plate in the multi-body dynamics model of the suspension system is a flat cover plate, calculate the uniform load on the upper half of the rubber bushing when the anti-roll bar end jumps up.

4. A method for improving the simulation accuracy of the strength and durability of the transverse stabilizer bar cover plate according to claim 1, characterized in that The calculation files of the two working conditions of jumping up and down in the fifth step refer to the data files exported from Hypermesh software that can be used by ABAQUS software to calculate stress results, and the files contain the mesh information, property information and loading information of the geometric models of the anti-roll bar cover plate, fixing bolts and subframe.

5. A method for improving the simulation accuracy of the strength and durability of the lateral stabilizer bar cover plate according to claim 1, characterized in that The calculation file for the upward jump condition in the fifth step refers to the data file exported from the Hypermesh software that can be used by the ABAQUS software to calculate the stress results. The file contains the mesh information, property information of the transverse stabilizer bar cover plate, fixing bolts, and subframe geometric model, as well as the uniformly distributed load and bolt pre-tightening force information applied.

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