Automobile plate spring design method and system based on single torsion bar turnover mechanism, vehicle and storage medium

Abstract

The invention provides an automobile plate spring design method based on a single torsion bar turnover mechanism, and the method comprises the steps: obtaining a whole vehicle basic parameter during the design of a target vehicle, and calculating a first target parameter of a plate spring; calculating a second target parameter of the plate spring according to the first target parameter, and performing motion simulation analysis verification on the whole vehicle attitude of the target vehicle; establishing a total arrangement dynamic model of the target vehicle, and verifying the first target parameter according to the total arrangement dynamic model; obtaining a stress model of the single-torsion-bar turnover mechanism of the target vehicle, and calculating the correlation influence of the stress of the single-torsion-bar turnover mechanism and the deformation of the vehicle frame; correcting the second target parameter according to the association influence, verifying the total arrangement dynamic model, and determining a first target parameter and the second target parameter; by acquiring the stress model of the single torsion bar turnover mechanism and calculating the associated influence of the stress model and the deformation of the frame, the stress condition in actual use is fully considered in the design process, and the practicability and reliability of the design are enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of automobile leaf spring design, and in particular, to an automobile leaf spring design method based on a single torsion bar flipping mechanism, an automobile leaf spring design system based on a single torsion bar flipping mechanism, a vehicle and a storage medium. Background Art

[0002] The leaf spring structure of light trucks is mainly designed as a steel leaf spring structure. The main basic characteristic parameters of the steel leaf spring include free stiffness, clamping stiffness, free arc height, and clamping arc height. The arc height is a key parameter that affects the unequal height of the cab. The current design mechanism is mainly based on the comprehensive calculation of the left and right load distribution of the vehicle, the leaf spring stiffness, and the empty / full load attitude angle of the vehicle to determine a reasonable arc height design standard range.

[0003] At present, it is common for light trucks to have cabs of different heights. In addition to being related to customer usage conditions, it is also related to the matching design of the suspension system in the early stage of product development. With economic development and the continuous upgrading of automobile products, consumers have higher and higher requirements for automobile performance, and their acceptance of unequal cab heights has become more and more stringent.

[0004] Based on the traditional leaf spring design method, the present application proposes a method of analyzing by establishing a strongly correlated CAE simulation model from the perspective of the correlation analysis of the entire vehicle layout and the associated matching of each system, and adds an analysis of the influence of the force model of the single torsion bar mechanism of the cab on the deformation of the frame, thereby calculating the influence of the single torsion bar mechanism on the uneven height of the cab, and correcting the arc height of the leaf spring through the CAE analysis value, thereby achieving a design method for a leaf spring that improves the influence of the uneven height of the cab. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present application is to propose a design method for an automobile leaf spring based on a single torsion bar flip mechanism.

[0007] The second aspect of the present application is to propose an automobile leaf spring design system based on a single torsion bar flip mechanism.

[0008] The third aspect of the present application is to provide a vehicle;

[0009] The fourth aspect of the present application is to propose a storage medium

[0010] In view of this, according to a first aspect of the present application, a design method for an automobile leaf spring based on a single torsion bar flip mechanism is provided, the method comprising:

[0011] Obtaining basic vehicle parameters of the target vehicle during design, so as to calculate first target parameters of the leaf spring of the target vehicle according to the basic vehicle parameters;

[0012] Calculating a second target parameter of the leaf spring according to the first target parameter, so as to perform a motion simulation analysis and verification on the whole vehicle posture of the target vehicle according to the second target parameter;

[0013] Establishing a general layout dynamic model of the target vehicle according to the first target parameter, the second target parameter and the verified qualified whole vehicle posture, so as to verify the first target parameter according to the general layout dynamic model;

[0014] Obtaining a force model of the single torsion bar rollover mechanism of the target vehicle, and calculating the correlation effect between the force of the single torsion bar rollover mechanism and the deformation of the frame according to the force model;

[0015] The second target parameter is modified according to the associated influence and the general arrangement dynamic model is verified to determine the first target parameter and the second target parameter.

[0016] The present application provides a design method for an automobile leaf spring based on a single torsion bar flip mechanism. First, the first target parameter of the leaf spring is calculated according to the basic parameters of the whole vehicle, and the second target parameter is further derived based on these parameters. This method ensures that the leaf spring design parameters are closely related to the performance of the whole vehicle, thereby improving the accuracy and pertinence of the design. By performing motion simulation analysis and verification on the whole vehicle posture of the target vehicle, factors that may affect the driving stability and comfort of the vehicle can be discovered and adjusted in time, the posture performance of the whole vehicle can be optimized, and the overall performance of the vehicle can be improved. The overall layout dynamic model is established and the first target parameter is verified. Not only static parameters are considered, but also dynamic simulation is combined, making the design verification more comprehensive, which helps to discover and solve potential design problems in advance. By obtaining the force model of the single torsion bar flip mechanism and calculating its correlation with the deformation of the frame, the force conditions in actual use are fully considered in the design process, which enhances the practicality and reliability of the design. The second target parameter is corrected according to the correlation between the force and the deformation of the frame, and the overall layout dynamic model is repeatedly verified, so that the design process has higher flexibility and can be adjusted and optimized according to actual conditions. Through the above method, the designed automobile leaf spring not only meets the basic parameter requirements of the target vehicle, but also maintains good performance stability in actual use, reduces failures and maintenance costs caused by improper design, and improves the overall product quality.

[0017] In a possible technical solution, further, the basic parameters of the whole vehicle include static load of leaf spring, straight length of leaf spring, static deflection, dynamic deflection and arc height of leaf spring; the first target parameter includes leaf spring stiffness, total moment of inertia of leaf spring in clamped state, leaf spring thickness, leaf spring width, leaf spring length and number of leaf spring leaves;

[0018] In this technical solution, the stiffness of the leaf spring in the first target parameter of the target vehicle directly affects the handling and comfort of the vehicle. By accurately calculating and adjusting the stiffness of the leaf spring, the ride comfort can be improved while ensuring the handling. In addition, the optimization of the total moment of inertia of the leaf spring in the clamped state also helps to reduce vibration and noise. The accurate calculation of the thickness, width, length and number of leaf springs helps to maximize the utilization of materials. This can not only reduce costs, but also reduce unnecessary weight, which has a positive impact on the fuel economy and power performance of the vehicle. Considering parameters such as static deflection, dynamic deflection and leaf spring arc height, the designed leaf spring can better adapt to the load changes of the vehicle under different working conditions, reduce fatigue damage caused by stress concentration, and thus enhance the durability of the leaf spring. Reasonable leaf spring design can improve the suspension stability of the vehicle and reduce safety accidents caused by suspension system failures. Especially under harsh road conditions, a stable suspension system can better protect the safety of the vehicle and passengers. By establishing a design process based on the basic parameters and target parameters of the whole vehicle, the iteration and optimization of the design can be promoted. In each design iteration, the design can be adjusted and improved based on new parameter feedback to achieve better performance.

[0019] In a possible technical solution, further, the leaf spring stiffness calculation formula is:

[0020]

[0021] The calculation formula for the total moment of inertia of the leaf spring in the clamped state is:

[0022]

[0023] The calculation formula for the leaf spring thickness is:

[0024]

[0025] The calculation formula for the number of leaf springs is:

[0026]

[0027] Among them, C represents the leaf spring stiffness, F w represents static load, f crepresents static deflection, J0 represents total moment of inertia, δ represents midpoint stress of simply supported beam with equal cross section of leaf spring, L represents length of leaf spring, k represents invalid length coefficient after considering U-bolt clamping leaf spring, E represents elastic modulus of material, h p Indicates the thickness of the leaf spring, δ c represents the allowable bending stress of the material, b represents the width of the leaf spring, and n represents the number of leaf springs;

[0028] In a possible technical solution, further, the second target parameter includes the arc height of the leaf spring and the curvature radius of the leaf spring in a free state;

[0029] The calculation formula of the leaf spring arc height is:

[0030] Among them, H i represents the arc height of the i-th leaf spring, L i represents the length of the i-th leaf spring, R i represents the curvature radius of the i-th leaf spring;

[0031] In this technical solution, by accurately calculating the arc height and curvature radius of the leaf spring in the free state, it is possible to ensure that the geometric shape of the leaf spring is highly consistent with the design requirements, thereby improving the accuracy and reliability of the design. Reasonable selection of arc height and curvature radius helps to optimize the mechanical properties of the leaf spring, such as stiffness, load-bearing capacity and fatigue life. This ensures that the leaf spring can maintain good performance under different working conditions. By adjusting the arc height and curvature radius of the leaf spring, the performance of the vehicle's suspension system can be affected, thereby improving the ride comfort. For example, appropriate arc height and curvature radius can reduce the bumpy feeling during vehicle driving and improve the ride stability. Reasonable selection of curvature radius helps to reduce the stress concentration phenomenon of the leaf spring when it is under force, thereby reducing the risk of fatigue damage. This can extend the service life of the leaf spring and reduce the maintenance cost caused by replacing the leaf spring.

[0032] In a possible technical solution, further, the overall layout dynamic model of the target vehicle is established according to the first target parameter, the second target parameter and the verified qualified whole vehicle posture, so as to verify the first target parameter according to the overall layout dynamic model, specifically:

[0033] Determining whether the leaf spring stiffness in the first target parameter matches by using the leaf spring arc height in the overall arrangement dynamic model;

[0034] If the leaf spring arc height in the general arrangement dynamic model matches the leaf spring stiffness in the first target parameter, the leaf spring stiffness is valid;

[0035] If the leaf spring arc height in the overall arrangement dynamic model does not match the leaf spring stiffness in the first target parameter, the leaf spring stiffness needs to be adjusted according to the leaf spring arc height and the overall arrangement dynamic model;

[0036] In this technical solution, the first target parameter (such as leaf spring stiffness, leaf spring thickness, width, etc.), the second target parameter (such as leaf spring arc height in free state, curvature radius, etc.) and the qualified vehicle posture (including the posture change of the vehicle under different working conditions) are integrated into a dynamic model. This model can simulate various dynamic behaviors of the vehicle during driving, including the response of the suspension system, the vibration of the vehicle body, etc. In the overall layout dynamic model, the leaf spring arc height is an important output parameter, which directly reflects the deformation of the leaf spring under stress. By comparing the leaf spring arc height in the model with the theoretical arc height corresponding to the leaf spring stiffness set in the first target parameter, the matching degree of the leaf spring stiffness can be evaluated. If the leaf spring arc height in the overall layout dynamic model matches the expected result of the leaf spring stiffness in the first target parameter, then the leaf spring stiffness can be considered to be effective, that is, it can provide the expected suspension performance and comfort in the actual driving of the vehicle. If it is found that the leaf spring arc height in the general layout dynamic model does not match the leaf spring stiffness in the first target parameter, then the leaf spring stiffness needs to be adjusted according to the actual arc height in the model and the overall performance of the general layout dynamic model. This adjustment may be based on the simulation results of the model or in combination with actual test data. The purpose of the adjustment is to make the leaf spring stiffness more consistent with the actual use requirements of the vehicle, thereby improving the performance and reliability of the suspension system.

[0037] In a possible technical solution, further, the force model of the single torsion bar flipping mechanism of the target vehicle is obtained, and the correlation effect between the force of the single torsion bar flipping mechanism and the frame deformation is calculated according to the force model, specifically:

[0038] Acquire a force model of a single torsion bar flipping mechanism of the target vehicle, so as to construct a loading force matrix model according to the force model of the single torsion bar flipping mechanism;

[0039] According to CAE simulation modal calculation, the loading force matrix model is decoupled into a multi-degree-of-freedom force and bending moment model;

[0040] Constructing a frame analysis model, inputting the multi-degree-of-freedom force and bending moment model into the frame analysis model to obtain a deformation modal value of the frame under bending moment;

[0041] Fitting the deformation difference between the two sides of the frame according to the deformation modal value of the frame subjected to bending moment to obtain correction data for uneven height of the frame;

[0042] In this technical solution, the force model of the single torsion bar flip mechanism of the target vehicle is obtained in order to understand the working state and behavior of the single torsion bar flip mechanism when it is subjected to force. This step usually involves a detailed analysis of factors such as vehicle structure, materials, and working environment. The loading force matrix model is a mathematical tool used for the mechanical behavior of the single torsion bar flip mechanism when it is subjected to various forces (such as gravity, inertia, etc.). This model can help us to have a deeper understanding of the performance of the mechanism under different conditions. CAE simulation modal calculation is a computer simulation technology used to analyze the dynamic characteristics of the loading force matrix model. Through CAE simulation, the loading force matrix model can be decoupled into a multi-degree-of-freedom (at least including the degrees of freedom in the three directions of X, Y and Z in three-dimensional coordinates) force and moment model, which helps to more accurately predict and the behavior of the single torsion bar flip mechanism in actual work. In order to analyze the deformation of the frame under the action of the single torsion bar flip mechanism, a frame sub-model needs to be constructed. This model will take into account factors such as the structure, material, and connection method of the frame. Input the multi-degree-of-freedom force and bending moment model into the frame analysis model. This step is to analyze the deformation of the frame when it is subjected to the force of the single torsion bar rollover structure. By inputting the multi-degree-of-freedom force and bending moment model into the frame analysis model, the deformation of the frame in actual conditions can be simulated. By analyzing the deformation of the frame after being subjected to force, the deformation modal value of the frame can be obtained, which is an important parameter to describe the deformation of the frame. By fitting the deformation difference on both sides of the frame, the unequal deformation of the frame in actual use can be understood, and the unequal height correction data can be obtained based on this, so as to optimize the design or maintenance adjustment of the vehicle structure.

[0043] In a possible technical solution, further, the leaf spring arc height includes an arc height of an unloaded leaf spring and an arc height of a fully loaded leaf spring;

[0044] The modifying of the second target parameter according to the association influence is specifically:

[0045] Determining the frame unequal height correction data according to the associated influence, and correcting the unloaded leaf spring arc height and the fully loaded leaf spring arc height of the target vehicle according to the unequal height correction data;

[0046] In this technical solution, by adjusting the arc height of the unloaded and fully loaded leaf springs according to the unequal height correction data of the frame, the adaptability of the suspension system to different load conditions can be significantly improved. This means that whether the vehicle is unloaded or fully loaded, the suspension system can maintain relatively stable performance and reduce the significant changes in suspension height and stiffness caused by load changes. The unequal height of the frame usually causes unnecessary vibration and shaking of the vehicle during driving, affecting driving stability. By correcting the arc height of the leaf spring, the unequal height deformation of the frame can be compensated, thereby reducing this adverse effect and improving the driving stability and ride comfort of the vehicle. Unreasonable leaf spring arc height settings may cause suspension system components (such as leaf springs, shock absorbers, etc.) to be subjected to excessive stress or wear, thereby shortening their service life. Through precise corrections, it is possible to ensure that the various components of the suspension system operate in the best working condition, reduce failures and replacement requirements caused by stress concentration or excessive wear, and thus extend the overall life of the suspension system. The performance of the suspension system directly affects the safety and reliability of the vehicle. By optimizing the leaf spring arc height setting, the vehicle can maintain a stable suspension height and stiffness under various working conditions, reducing the risk of safety accidents caused by suspension system failure. At the same time, a stable suspension system also helps improve the vehicle's handling and braking performance, further enhancing the vehicle's overall safety and reliability.

[0047] According to a second aspect of the present application, a vehicle leaf spring design system based on a single torsion bar flip mechanism is provided, the system comprising:

[0048] The first acquisition module is used to obtain the basic parameters of the target vehicle, including the static load of the leaf spring, the straight length of the leaf spring, the static deflection, the dynamic deflection and the arc height of the leaf spring;

[0049] A first processing module is used to calculate first target parameters according to the basic parameters of the whole vehicle acquired by the first acquisition module, including: leaf spring stiffness, total moment of inertia of the leaf spring in a clamped state, leaf spring thickness, leaf spring width, leaf spring length and number of leaf springs;

[0050] A second processing module, configured to calculate second target parameters according to the first target parameters acquired by the first processing module, including an unloaded arc height, a fully loaded arc height, and a curvature radius of the leaf spring;

[0051] A first verification module, used for verifying the first target parameter and the second target parameter;

[0052] A first correction module is configured to input a force model of a single torsion bar rollover mechanism of the target vehicle and correct the first target parameter and the second target parameter;

[0053] The first output module is used to output the first target parameter and the second target parameter corrected by the first correction module.

[0054] The present application provides a vehicle leaf spring design system based on a single torsion bar flip mechanism. The system can achieve refined control of the design of the vehicle leaf spring by accurately obtaining the basic parameters of the target vehicle (such as static load, straight length, static deflection, dynamic deflection and arc height of the leaf spring). The accurate input of these parameters provides a solid foundation for subsequent calculations, thereby ensuring the accuracy of the design results. The first processing module and the second processing module can automatically calculate the key design parameters of the leaf spring (such as stiffness, moment of inertia, thickness, width, length, number of sheets, no-load and full-load arc height, radius of curvature, etc.) according to the input basic parameters. This automated calculation not only improves the design efficiency, but also reduces the possibility of human calculation errors. The first verification module verifies the parameters calculated initially to ensure the rationality and accuracy of the parameters. The first correction module further introduces the force model of the single torsion bar flip mechanism of the target vehicle to dynamically correct the parameters. This step takes into account the force conditions of the leaf spring under actual working conditions, so that the design results are closer to actual application requirements and improve the reliability and practicality of the design. Through precise calculation and dynamic correction of leaf spring design, the system helps optimize the performance of leaf springs, such as improving load-bearing capacity, reducing vibration and noise, and improving driving comfort. At the same time, the optimized design can also extend the service life of leaf springs, reduce replacement frequency, and reduce vehicle maintenance costs. The system has the ability to quickly process and analyze large amounts of data, and can quickly respond to design requirements for different models and working conditions. This helps automakers quickly adjust product strategies to meet the diverse needs of the market. Compared with traditional manual design and calculation methods, the system significantly improves design efficiency and reduces design cycles and costs. At the same time, by optimizing the design and reducing unnecessary material waste, production costs are further reduced.

[0055] According to a third aspect of the present application, a vehicle is provided, comprising a leaf spring structure provided by any of the above designs.

[0056] A vehicle provided in the present application includes a leaf spring structure provided by any of the above designs, and therefore has all the beneficial effects of the automobile leaf spring design method based on a single torsion bar flipping mechanism, which will not be repeated here.

[0057] According to the fourth aspect of the present application, a storage medium is provided, which stores a vehicle leaf spring design program based on a single torsion bar flipping mechanism. When executed by a processor, it can implement a vehicle leaf spring design method based on a single torsion bar flipping mechanism as described above.

[0058] A storage medium provided in the present application includes a vehicle leaf spring design method based on a single torsion bar flipping mechanism provided by any of the above-mentioned designs, and therefore has all the beneficial effects of the vehicle leaf spring design method based on a single torsion bar flipping mechanism, which will not be repeated here.

[0059] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0061] Figure 1 The present invention is a flowchart of a method for designing an automobile leaf spring based on a single torsion bar flipping mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0063] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0064] Embodiment 1

[0065] A design method for an automobile leaf spring based on a single torsion bar flip mechanism comprises the following steps:

[0066] Step S100: acquiring basic parameters of the target vehicle during design, so as to calculate first target parameters of the leaf spring of the target vehicle according to the basic parameters of the target vehicle;

[0067] Furthermore, the basic parameters of the vehicle include static load of the leaf spring, straight length of the leaf spring, static deflection, dynamic deflection and arc height of the leaf spring; the first target parameters include leaf spring stiffness, total moment of inertia of the leaf spring in clamped state, leaf spring thickness, leaf spring width, leaf spring length and number of leaf springs;

[0068] It should be understood that, based on the above-mentioned feature definition, the stiffness of the leaf spring in the first target parameter of the target vehicle directly affects the handling and comfort of the vehicle. By accurately calculating and adjusting the stiffness of the leaf spring, the ride comfort can be improved while ensuring the handling. In addition, the optimization of the total moment of inertia of the leaf spring in the clamped state also helps to reduce vibration and noise. The accurate calculation of the thickness, width, length and number of leaf springs helps to maximize the utilization of materials. This can not only reduce costs, but also reduce unnecessary weight, which has a positive impact on the fuel economy and power performance of the vehicle. Considering parameters such as static deflection, dynamic deflection and leaf spring arc height, the designed leaf spring can better adapt to the load changes of the vehicle under different working conditions, reduce fatigue damage caused by stress concentration, and thus enhance the durability of the leaf spring. Reasonable leaf spring design can improve the suspension stability of the vehicle and reduce safety accidents caused by suspension system failures. Especially under harsh road conditions, a stable suspension system can better protect the safety of the vehicle and passengers. By establishing a design process based on the basic parameters and target parameters of the whole vehicle, the iteration and optimization of the design can be promoted. In each design iteration, the design can be adjusted and improved based on new parameter feedback to achieve better performance.

[0069] Specifically, the leaf spring stiffness calculation formula is:

[0070]

[0071] The calculation formula for the total moment of inertia of the leaf spring in the clamped state is:

[0072]

[0073] The calculation formula for leaf spring thickness is:

[0074]

[0075] The calculation formula for the number of leaf springs is:

[0076]

[0077] Among them, C represents the leaf spring stiffness, F w represents static load, f c represents static deflection, J0 represents total moment of inertia, ε represents midpoint stress of simply supported beam with equal cross section of leaf spring, L represents length of leaf spring, k represents invalid length coefficient after considering U-bolt clamping leaf spring, E represents elastic modulus of material, h p Indicates the thickness of the leaf spring, δ c represents the allowable bending stress of the material, b represents the width of the leaf spring, and n represents the number of leaf springs.

[0078] Step S200: calculating the second target parameter of the leaf spring according to the first target parameter, so as to perform motion simulation analysis and verification on the whole vehicle posture of the target vehicle according to the second target parameter;

[0079] Further, the second target parameter includes the arc height of the leaf spring in a free state and the curvature radius of the leaf spring;

[0080] Specifically, the calculation formula for the leaf spring arc height is:

[0081]

[0082] Among them, H i represents the arc height of the i-th leaf spring, L i represents the length of the i-th leaf spring, R i represents the curvature radius of the i-th leaf spring;

[0083] Based on the above-mentioned feature definitions, by accurately calculating the arc height and curvature radius of the leaf spring in the free state, it is possible to ensure that the geometric shape of the leaf spring is highly consistent with the design requirements, thereby improving the accuracy and reliability of the design. Reasonable selection of arc height and curvature radius helps to optimize the mechanical properties of the leaf spring, such as stiffness, load-bearing capacity and fatigue life. This ensures that the leaf spring can maintain good performance under different working conditions. By adjusting the arc height and curvature radius of the leaf spring, the performance of the vehicle's suspension system can be affected, thereby improving the ride comfort. For example, appropriate arc height and curvature radius can reduce the bumpy feeling during vehicle driving and improve the ride stability. Reasonable selection of curvature radius helps to reduce the stress concentration phenomenon of the leaf spring when it is under force, thereby reducing the risk of fatigue damage. This can extend the service life of the leaf spring and reduce the maintenance cost caused by replacing the leaf spring.

[0084] Step S300: establishing a general layout dynamic model of the target vehicle according to the first target parameter, the second target parameter and the verified qualified vehicle posture, so as to verify the first target parameter according to the general layout dynamic model;

[0085] Further, the following steps are included:

[0086] Step S310: determining whether the leaf spring stiffness in the first target parameter matches by using the leaf spring arc height in the general arrangement dynamic model;

[0087] Step S320: If the leaf spring arc height in the general arrangement dynamic model matches the leaf spring stiffness in the first target parameter, the leaf spring stiffness is valid;

[0088] Step S330: if the leaf spring arc height in the overall arrangement dynamic model does not match the leaf spring stiffness in the first target parameter, the leaf spring stiffness needs to be adjusted according to the leaf spring arc height and the overall arrangement dynamic model;

[0089] It should be understood that, based on the above specific steps, the first target parameter (such as leaf spring stiffness, leaf spring thickness, width, etc.), the second target parameter (such as leaf spring arc height in free state, radius of curvature, etc.) and the qualified vehicle posture (including the posture change of the vehicle under different working conditions) are integrated into a dynamic model. This model can simulate various dynamic behaviors of the vehicle during driving, including the response of the suspension system, the vibration of the vehicle body, etc. In the overall layout dynamic model, the leaf spring arc height is an important output parameter, which directly reflects the deformation of the leaf spring under stress. By comparing the leaf spring arc height in the model with the theoretical arc height corresponding to the leaf spring stiffness set in the first target parameter, the matching degree of the leaf spring stiffness can be evaluated. If the leaf spring arc height in the overall layout dynamic model matches the expected result of the leaf spring stiffness in the first target parameter, then the leaf spring stiffness can be considered to be effective, that is, it can provide the expected suspension performance and comfort in the actual driving of the vehicle. If it is found that the leaf spring arc height in the general layout dynamic model does not match the leaf spring stiffness in the first target parameter, then the leaf spring stiffness needs to be adjusted according to the actual arc height in the model and the overall performance of the general layout dynamic model. This adjustment may be based on the simulation results of the model or in combination with actual test data. The purpose of the adjustment is to make the leaf spring stiffness more consistent with the actual use requirements of the vehicle, thereby improving the performance and reliability of the suspension system.

[0090] Step S400: obtaining a force model of a single torsion bar rollover mechanism of a target vehicle, and calculating the correlation between the force of the single torsion bar rollover mechanism and the deformation of the vehicle frame according to the force model;

[0091] Further, the method specifically includes the following steps:

[0092] Step S410: obtaining a force model of a single torsion bar flipping mechanism of a target vehicle, so as to construct a loading force matrix model according to the force model of the single torsion bar flipping mechanism;

[0093] Step S420: decoupling the loading force matrix model into a multi-degree-of-freedom force and bending moment model according to CAE simulation modal calculation;

[0094] Step S430: constructing a frame analysis model, inputting a multi-degree-of-freedom force and bending moment model into the frame analysis model to obtain a deformation modal value of the frame subjected to bending moment;

[0095] Step S440: fitting the deformation difference between the two sides of the frame according to the deformation modal value of the frame under bending moment to obtain the correction data of the uneven height of the frame;

[0096] It should be understood that, based on the above specific steps, the force model of the single torsion bar flip mechanism of the target vehicle is obtained in order to understand the working state and behavior of the single torsion bar flip mechanism when it is subjected to force. This step usually involves a detailed analysis of factors such as vehicle structure, materials, and working environment. The loading force matrix model is a mathematical tool used for the mechanical behavior of the single torsion bar flip mechanism when it is subjected to various forces (such as gravity, inertia, etc.). This model can help us to have a deeper understanding of the performance of the mechanism under different conditions. CAE simulation modal calculation is a computer simulation technology used to analyze the dynamic characteristics of the loading force matrix model. Through CAE simulation, the loading force matrix model can be decoupled into a multi-degree-of-freedom (at least including the degrees of freedom in the three directions of X, Y and Z in three-dimensional coordinates) force and moment model, which helps to more accurately predict and analyze the behavior of the single torsion bar flip mechanism in actual work. In order to analyze the deformation of the frame under the action of the single torsion bar flip mechanism, a frame sub-model needs to be constructed. This model will take into account factors such as the structure, material, and connection method of the frame. Input the multi-degree-of-freedom force and bending moment model into the frame analysis model. This step is to analyze the deformation of the frame when it is subjected to the force of a single torsion bar flipping. By inputting the multi-degree-of-freedom force and bending moment model into the frame analysis model, the deformation of the frame in actual conditions can be simulated. By analyzing the deformation of the frame after being subjected to force, the deformation modal value of the frame can be obtained, which is an important parameter for describing the deformation of the frame. By fitting the deformation difference on both sides of the frame, the unequal deformation of the frame in actual use can be understood, and the unequal height correction data can be obtained based on this, so as to optimize the design or maintenance adjustment of the vehicle structure.

[0097] Further, the leaf spring arc height includes an unloaded leaf spring arc height and a fully loaded leaf spring arc height;

[0098] The second target parameter is modified according to the associated impact, specifically:

[0099] deriving frame unequal height correction data according to the associated influence, and correcting the arc height of the unloaded leaf spring and the arc height of the fully loaded leaf spring of the target vehicle according to the unequal height correction data;

[0100] Step S500: modifying the second target parameter according to the associated influence and verifying the general arrangement dynamic model to determine the first target parameter and the second target parameter;

[0101] It should be understood that, based on the above-mentioned feature definition, by adjusting the arc height of the unloaded and fully loaded leaf springs according to the unequal height correction data of the frame, the adaptability of the suspension system to different load conditions can be significantly improved. This means that whether the vehicle is unloaded or fully loaded, the suspension system can maintain relatively stable performance and reduce the significant changes in suspension height and stiffness caused by load changes. The unequal height of the frame usually causes unnecessary vibration and shaking of the vehicle during driving, affecting driving stability. By correcting the arc height of the leaf spring, the unequal height deformation of the frame can be compensated, thereby reducing this adverse effect and improving the driving stability and ride comfort of the vehicle. Unreasonable leaf spring arc height settings may cause suspension system components (such as leaf springs, shock absorbers, etc.) to be subjected to excessive stress or wear, thereby shortening their service life. Through precise corrections, it is possible to ensure that the various components of the suspension system operate in the best working condition, reduce failures and replacement requirements caused by stress concentration or excessive wear, and thus extend the overall life of the suspension system. The performance of the suspension system directly affects the safety and reliability of the vehicle. By optimizing the leaf spring arc height setting, the vehicle can maintain a stable suspension height and stiffness under various working conditions, reducing the risk of safety accidents caused by suspension system failure. At the same time, a stable suspension system also helps improve the vehicle's handling and braking performance, further enhancing the vehicle's overall safety and reliability.

[0102] According to a design method of an automobile leaf spring based on a single torsion bar flip mechanism of the present embodiment, the first target parameter of the leaf spring is first calculated according to the basic parameters of the whole vehicle, and the second target parameter is further derived based on these parameters. This method ensures that the design parameters of the leaf spring are closely related to the performance of the whole vehicle, thereby improving the accuracy and pertinence of the design. By performing motion simulation analysis and verification on the whole vehicle posture of the target vehicle, factors that may affect the driving stability and comfort of the vehicle can be discovered and adjusted in time, the posture performance of the whole vehicle can be optimized, and the overall performance of the vehicle can be improved. The overall layout dynamic model is established and the first target parameter is verified. Not only static parameters are considered, but also dynamic simulation is combined, making the design verification more comprehensive, which helps to discover and solve potential design problems in advance. By obtaining the force model of the single torsion bar flip mechanism and calculating its correlation with the deformation of the frame, the force conditions in actual use are fully considered in the design process, which enhances the practicality and reliability of the design. The second target parameter is corrected according to the correlation between the force and the deformation of the frame, and the overall layout dynamic model is repeatedly verified, so that the design process has higher flexibility and can be adjusted and optimized according to actual conditions. Through the above method, the designed automobile leaf spring not only meets the basic parameter requirements of the target vehicle, but also maintains good performance stability in actual use, reduces failures and maintenance costs caused by improper design, and improves the overall product quality.

[0103] Embodiment 2

[0104] A vehicle leaf spring design system based on a single torsion bar flip mechanism, the system comprising:

[0105] The first acquisition module is used to obtain the basic parameters of the target vehicle, including the static load of the leaf spring, the straight length of the leaf spring, the static deflection, the dynamic deflection and the arc height of the leaf spring;

[0106] A first processing module is used to calculate first target parameters according to the basic parameters of the whole vehicle obtained by the first obtaining module, including: leaf spring stiffness, total moment of inertia of the leaf spring in a clamped state, leaf spring thickness, leaf spring width, leaf spring length and number of leaf springs;

[0107] A second processing module, used for calculating second target parameters according to the first target parameters obtained by the first processing module, including an unloaded arc height, a fully loaded arc height, and a curvature radius of the leaf spring;

[0108] A first verification module, used to verify the first target parameter and the second target parameter;

[0109] A first correction module inputs a force model of a single torsion bar rollover mechanism of a target vehicle and corrects the first target parameter and the second target parameter;

[0110] The first output module is used to output the first target parameter and the second target parameter corrected by the first correction module.

[0111] According to a vehicle leaf spring design system based on a single torsion bar flip mechanism of the present embodiment, the system can achieve refined control of the design of the vehicle leaf spring by accurately obtaining the basic parameters of the whole vehicle of the target vehicle (such as static load, straight length, static deflection, dynamic deflection and arc height of the leaf spring, etc.). The accurate input of these parameters provides a solid foundation for subsequent calculations, thereby ensuring the accuracy of the design results. The first processing module and the second processing module can automatically calculate the key design parameters of the leaf spring (such as stiffness, moment of inertia, thickness, width, length, number of sheets, arc height of no-load and full-load, radius of curvature, etc.) according to the input basic parameters. This automated calculation not only improves the design efficiency, but also reduces the possibility of human calculation errors. The first verification module verifies the parameters calculated initially to ensure the rationality and accuracy of the parameters. The first correction module further introduces the force model of the single torsion bar flip mechanism of the target vehicle to dynamically correct the parameters. This step takes into account the force conditions of the leaf spring under actual working conditions, so that the design results are closer to the actual application requirements and improve the reliability and practicality of the design. Through precise calculation and dynamic correction of leaf spring design, the system helps optimize the performance of leaf springs, such as improving load-bearing capacity, reducing vibration and noise, and improving driving comfort. At the same time, the optimized design can also extend the service life of leaf springs, reduce replacement frequency, and reduce vehicle maintenance costs. The system has the ability to quickly process and analyze large amounts of data, and can quickly respond to design requirements for different models and working conditions. This helps automakers quickly adjust product strategies to meet the diverse needs of the market. Compared with traditional manual design and calculation methods, the system significantly improves design efficiency and reduces design cycles and costs. At the same time, by optimizing the design and reducing unnecessary material waste, production costs are further reduced.

[0112] Embodiment 3

[0113] A vehicle includes the leaf spring structure provided by the design method of embodiment 1.

[0114] The vehicle provided in the present application includes the leaf spring structure provided by the design method of the first embodiment, and thus has all the beneficial effects of the vehicle leaf spring design method based on the single torsion bar flip mechanism, which will not be described in detail here.

[0115] Embodiment 4

[0116] A storage medium includes a vehicle leaf spring design method based on a single torsion bar flipping mechanism provided in Example 1, and therefore has all the beneficial effects of the vehicle leaf spring design method based on a single torsion bar flipping mechanism, which will not be repeated here.

[0117] In this application, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0118] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0119] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A design method for an automobile leaf spring based on a single torsion bar flip mechanism, characterized in that: The method comprises: Obtaining basic vehicle parameters of the target vehicle during design, so as to calculate first target parameters of the leaf spring of the target vehicle according to the basic vehicle parameters; Calculating a second target parameter of the leaf spring according to the first target parameter, so as to perform a motion simulation analysis and verification on the whole vehicle posture of the target vehicle according to the second target parameter; Establishing a general layout dynamic model of the target vehicle according to the first target parameter, the second target parameter and the verified qualified whole vehicle posture, so as to verify the first target parameter according to the general layout dynamic model; Obtaining a force model of the single torsion bar rollover mechanism of the target vehicle, and calculating the correlation effect between the force of the single torsion bar rollover mechanism and the deformation of the frame according to the force model; The second target parameter is modified according to the associated influence and the general arrangement dynamic model is verified to determine the first target parameter and the second target parameter.

2. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 1 is characterized in that: The basic parameters of the whole vehicle include the static load of the leaf spring, the straight length of the leaf spring, the static deflection, the dynamic deflection and the arc height of the leaf spring; the first target parameters include the stiffness of the leaf spring, the total moment of inertia of the leaf spring in the clamped state, the thickness of the leaf spring, the width of the leaf spring, the length of the leaf spring and the number of leaf springs.

3. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 2 is characterized in that: The leaf spring stiffness calculation formula is: The calculation formula for the total moment of inertia of the leaf spring in the clamped state is: The calculation formula for the leaf spring thickness is: The calculation formula for the number of leaf springs is: Among them, C represents the leaf spring stiffness, F w represents static load, f c represents static deflection, J0 represents total moment of inertia, δ represents midpoint stress of simply supported beam with equal cross section of leaf spring, L represents length of leaf spring, k represents invalid length coefficient after considering U-bolt clamping leaf spring, E represents elastic modulus of material, h p Indicates the thickness of the leaf spring, δ c represents the allowable bending stress of the material, b represents the width of the leaf spring, and n represents the number of leaf springs.

4. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 3 is characterized in that: The second target parameter includes the arc height of the leaf spring and the curvature radius of the leaf spring in a free state; The calculation formula of the leaf spring arc height is: Among them, H i represents the arc height of the i-th leaf spring, L i represents the length of the i-th leaf spring, R i represents the curvature radius of the i-th leaf spring.

5. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 4 is characterized in that: The step of establishing the overall layout dynamic model of the target vehicle according to the first target parameter, the second target parameter and the verified vehicle posture, so as to verify the first target parameter according to the overall layout dynamic model, is specifically as follows: Determining whether the leaf spring stiffness in the first target parameter matches by using the leaf spring arc height in the overall arrangement dynamic model; If the leaf spring arc height in the general arrangement dynamic model matches the leaf spring stiffness in the first target parameter, the leaf spring stiffness is valid; If the leaf spring arc height in the overall arrangement dynamic model does not match the leaf spring stiffness in the first target parameter, the leaf spring stiffness needs to be adjusted according to the leaf spring arc height and the overall arrangement dynamic model.

6. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 4 is characterized in that: The step of obtaining the force model of the single torsion bar rollover mechanism of the target vehicle and calculating the correlation between the force of the single torsion bar rollover mechanism and the deformation of the frame according to the force model is specifically as follows: Acquire a force model of a single torsion bar flipping mechanism of the target vehicle, so as to construct a loading force matrix model according to the force model of the single torsion bar flipping mechanism; According to CAE simulation modal calculation, the loading force matrix model is decoupled into a multi-degree-of-freedom force and bending moment model; Constructing a frame analysis model, inputting the multi-degree-of-freedom force and bending moment model into the frame analysis model to obtain a deformation modal value of the frame under bending moment; The deformation difference between the two sides of the frame is fitted according to the deformation modal value of the frame subjected to bending moment, so as to obtain the correction data of the uneven height of the frame.

7. The design method of an automobile leaf spring based on a single torsion bar flip mechanism according to claim 4 is characterized in that: The leaf spring arc height includes the no-load leaf spring arc height and the fully loaded leaf spring arc height; The modifying of the second target parameter according to the association influence is specifically: The frame unequal height correction data is obtained according to the associated influence, and the unloaded leaf spring arc height and the fully loaded leaf spring arc height of the target vehicle are corrected according to the unequal height correction data.

8. A vehicle leaf spring design system based on a single torsion bar flip mechanism, capable of implementing a vehicle leaf spring design method based on a single torsion bar flip mechanism as claimed in any one of claims 1 to 7, characterized in that: The system comprises: The first acquisition module is used to obtain the basic parameters of the target vehicle, including the static load of the leaf spring, the straight length of the leaf spring, the static deflection, the dynamic deflection and the arc height of the leaf spring; A first processing module is used to calculate first target parameters according to the basic parameters of the whole vehicle acquired by the first acquisition module, including: leaf spring stiffness, total moment of inertia of the leaf spring in a clamped state, leaf spring thickness, leaf spring width, leaf spring length and number of leaf springs; A second processing module, configured to calculate second target parameters according to the first target parameters acquired by the first processing module, including an unloaded arc height, a fully loaded arc height, and a curvature radius of the leaf spring; A first verification module, used for verifying the first target parameter and the second target parameter; A first correction module is configured to input a force model of a single torsion bar rollover mechanism of the target vehicle and correct the first target parameter and the second target parameter; The first output module is used to output the first target parameter and the second target parameter corrected by the first correction module.

9. A vehicle, characterized in that: A leaf spring structure designed by a vehicle leaf spring design method based on a single torsion bar flipping mechanism as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: There is a vehicle leaf spring design program based on a single torsion bar flipping mechanism, which, when executed by a processor, can implement a vehicle leaf spring design method based on a single torsion bar flipping mechanism as described in any one of claims 1-7.

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