A method and system for simulating the motion trajectory of a leaf spring

Abstract

The application discloses a leaf spring motion trajectory simulation method and system, the method comprises the following steps: obtaining the leaf spring selection parameters of a light vehicle, and not constraining the main piece center point installation surface angle; generating the preliminary shape contour map of the leaf spring according to the leaf spring selection parameters; applying constraints to each unit of the preliminary shape contour map, approximating the upper surface of the leaf spring to a circular arc, and applying angle constraints to the circular arc by using the formula arc length = radian * radius; obtaining the motion trajectory of the leaf spring main piece center point and the leaf spring curve under typical working conditions by curvature radius driving, and the typical working conditions comprise an empty load working condition, a full load working condition, an upper limit working condition and a lower limit working condition; and stretching and thickening the leaf spring curve to manufacture a leaf spring model. The system comprises a leaf spring selection parameter acquisition module, a leaf spring preliminary shape contour map generation module, a circular arc constraint module, a leaf spring motion trajectory and leaf spring curve generation module and a leaf spring model manufacturing module. Through the application, the precision of the leaf spring motion trajectory can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of light vehicle leaf spring design technology, and in particular to a method and system for simulating the motion trajectory of a leaf spring. Background Technology

[0002] In developing leaf spring suspensions for light vehicles, most OEMs obtain the specific positions of the wheel centers and leaf springs by scanning the chassis posture of benchmark vehicles. However, due to the different positioning and functions of various light vehicles, it is usually necessary to redesign the suspension hardpoints and simulate the leaf spring's motion trajectory. Therefore, how to simulate the leaf spring's motion trajectory is a crucial technical issue.

[0003] Currently, the method for simulating the motion trajectory of a leaf spring usually involves using CATIA software to collect the suspension hard points, approximate the length of the arc, drive the arc height, and then calculate the radius of curvature. The mounting surface of the main leaf center point is regarded as a translation that keeps the angle constant, thus forming the motion trajectory line of the leaf spring.

[0004] However, current methods for simulating the motion trajectory of leaf springs often approximate the length of the arc when applying constraints, resulting in insufficient accuracy. Furthermore, the simulation methods drive the arc height, and the radius of curvature is calculated from this arc height, leading to inaccurate curvature and further compromising the simulation's accuracy. Additionally, current methods treat the mounting surface of the main leaf spring's center point as a translational motion with a constant angle. In reality, the mounting surface of the main leaf spring's center point undergoes slight angular changes, which also contributes to the low accuracy of the final simulated leaf spring trajectory. Summary of the Invention

[0005] This application provides a method and system for simulating the motion trajectory of a leaf spring, in order to solve the problem that the accuracy of the simulated leaf spring motion trajectory is not high enough by existing methods.

[0006] To address the aforementioned technical problems, the embodiments of this application disclose the following technical solutions:

[0007] A method for simulating the motion trajectory of a leaf spring, the method comprising:

[0008] Obtain the leaf spring selection parameters for light vehicles. The leaf spring selection parameters include: leaf spring mounting hard point, hanger plate hard point, and leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf.

[0009] Based on the selected leaf spring parameters, a preliminary shape profile of the leaf spring is generated;

[0010] Constraints are applied to each unit of the preliminary shape contour drawing, and the upper surface of the leaf spring is approximated as an arc. An angular constraint is applied to the arc using the formula arc length = radian * radius.

[0011] Driven by the radius of curvature, the motion trajectory of the center point of the main leaf spring and the leaf spring curve under typical working conditions are obtained. The typical working conditions include: no-load working condition, full-load working condition, upper limit working condition and lower limit working condition.

[0012] The leaf spring curve is stretched and thickened to create a leaf spring model.

[0013] Optionally, a method for applying constraints to each unit of the preliminary shape contour drawing, approximating the upper surface of the leaf spring as an arc, and applying angular constraints to the arc using the formula arc length = radian * radius, includes:

[0014] Based on the preliminary shape outline, the upper surface of the leaf spring is approximated as a circular arc;

[0015] By using the formula Arc length = Radius * Radius, the arc length is fixed, and the arc radius is changed to impose a constraint on the arc.

[0016] Optionally, the step of fixing the arc length using the formula arc length = radians * radius, and applying constraints to the arc by changing its radius, specifically involves:

[0017] Using the formula Arc length = Radius * Radius, the arc length of the arc is fixed, and by changing the radius of the arc, the hard points of the leaf spring mounting plate, the hard points of the lug plate, the line segments, the lugs, the coils, and the main spring in the arc are constrained.

[0018] Optionally, the step of obtaining the motion trajectory of the center point of the leaf spring main plate and the leaf spring curve under typical working conditions through curvature radius driving includes:

[0019] By modifying the radius of curvature, different values ​​of arc height can be obtained;

[0020] The movement trajectory of the center point of the leaf spring is formed according to different values ​​of arc height;

[0021] Based on the motion trajectory of the center point of the main leaf spring, the leaf spring curve under typical working conditions is output;

[0022] Record the real-time position of the center point of the leaf spring main plate at every set arc height change distance;

[0023] Connect multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate.

[0024] Optionally, after stretching and thickening the leaf spring curve to create a leaf spring model, the method further includes:

[0025] The hard points of the leaf spring installation are checked based on the leaf spring model and the tire envelope.

[0026] Optionally, the step of checking the leaf spring mounting hard points based on the leaf spring model and the tire envelope includes:

[0027] The tire envelope is obtained based on the motion trajectory of the center point of the main leaf spring.

[0028] Based on the leaf spring model and tire envelope, determine whether the installation of the leaf spring hard point is feasible;

[0029] If feasible, the process ends;

[0030] If this is not feasible, obtain the leaf spring selection parameters for the light vehicle again until the leaf spring installation hard point is feasible.

[0031] A leaf spring motion trajectory simulation system, the simulation system comprising:

[0032] The leaf spring selection parameter acquisition module is used to acquire the leaf spring selection parameters for light vehicles. The leaf spring selection parameters include: leaf spring mounting hard point, hanger plate hard point, and leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf.

[0033] The leaf spring preliminary shape outline generation module is used to generate a preliminary shape outline of the leaf spring based on the leaf spring selection parameters.

[0034] The arc constraint module is used to approximate the upper surface of the leaf spring as an arc based on the preliminary shape contour drawing, and to apply angular constraints to the arc using the formula arc length = radian * radius;

[0035] The leaf spring motion trajectory and leaf spring curve generation module is used to obtain the motion trajectory of the center point of the main leaf spring and the leaf spring curve under typical working conditions through curvature radius drive. The typical working conditions include: no-load working condition, full-load working condition, upper limit working condition and lower limit working condition.

[0036] The leaf spring model making module is used to stretch and thicken the leaf spring curve to create a leaf spring model.

[0037] Optionally, the circular arc constraint module includes:

[0038] A definition unit is used to approximate the upper surface of the leaf spring as a circular arc based on the preliminary shape contour drawing;

[0039] The constraint unit is used to fix the arc length of the arc by using the formula arc length = radians * radius, and to apply constraints to the arc by changing the radius of the arc.

[0040] Optionally, the leaf spring motion trajectory and leaf spring curve generation module includes:

[0041] The arc height acquisition unit is used to obtain arc heights of different values ​​by modifying the radius of curvature;

[0042] The first motion trajectory forming unit is used to form the motion trajectory of the center point of the leaf spring main plate according to different values ​​of arc height;

[0043] The leaf spring curve output unit is used to output the leaf spring curve under typical working conditions based on the motion trajectory of the center point of the main leaf spring.

[0044] The recording unit is used to record the real-time position of the center point of the leaf spring main plate at set intervals of arc height change.

[0045] The second motion trajectory forming unit is used to connect multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate.

[0046] Optionally, the system further includes a verification module for verifying the hard points of the leaf spring mounting according to the leaf spring model and the tire envelope.

[0047] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0048] This application provides a method for simulating the motion trajectory of a leaf spring. The method first obtains the leaf spring selection parameters for a light vehicle, i.e., adds constraints to the hard points of the leaf spring installation. Second, it generates a preliminary shape contour diagram of the leaf spring based on the selection parameters. Based on this preliminary shape contour diagram, the upper surface of the leaf spring is approximated as an arc. An angular constraint is applied to this arc using the arc length formula. Then, driven by the radius of curvature, the motion trajectory of the center point of the main leaf spring and the leaf spring curve under typical working conditions are obtained. Finally, the leaf spring curve is stretched and thickened to create a leaf spring model. In this embodiment, the leaf spring motion trajectory simulation method calculates the arc length precisely according to the arc length formula, making the constraints applied to the arc more accurate and improving the simulation effect. This embodiment uses radius of curvature driving, rather than arc height driving, which further improves the accuracy of the leaf spring motion trajectory simulation. In addition, in this embodiment, when determining the selection parameters of the leaf spring, the angle of the mounting surface of the center point of the main leaf is not constrained. That is, the mounting surface of the center point of the main leaf is not regarded as a translational motion with a constant angle, but is not constrained, so as to ensure that it has an appropriate angle change. Typically, the angle change range from no load to the upper limit mounting surface is 0.2-0.5 degrees. This makes the obtained leaf spring motion trajectory more accurate and helps to improve the accuracy of the simulation results.

[0049] This application also provides a leaf spring motion trajectory simulation system, which mainly includes: a leaf spring selection parameter acquisition module, a leaf spring preliminary shape contour diagram generation module, an arc constraint module, a leaf spring motion trajectory and leaf spring curve generation module, and a leaf spring model making module. This embodiment achieves leaf spring motion trajectory simulation by setting each module in the sketching module of CATIA software. By setting the arc constraint module, the arc length can be accurately calculated using a formula, thereby improving the arc length accuracy and thus the accuracy of the motion trajectory simulation. By setting the leaf spring motion trajectory and leaf spring curve generation module, the motion trajectory of the leaf spring main plate center point and the leaf spring curve under typical working conditions are obtained through curvature radius driving. Compared with the arc height driving method in the prior art, this further improves the accuracy of leaf spring motion trajectory simulation. The leaf spring selection parameter acquisition module does not constrain the angle of the main plate center point mounting surface in the leaf spring selection parameters. By releasing the constraint, the final obtained main plate center point mounting surface exhibits a slight angle change during movement, which is more consistent with actual conditions. Therefore, this structural design can further improve the accuracy of leaf spring motion trajectory simulation.

[0050] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0051] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a flowchart illustrating a method for simulating the motion trajectory of a leaf spring provided in an embodiment of this application.

[0054] Figure 2 This is a schematic diagram of the leaf spring's motion trajectory in an embodiment of this application;

[0055] Figure 3 This is a schematic diagram of the center points of each mounting surface in the leaf spring center point mounting surface of the embodiments of this application;

[0056] Figure 4 This is a schematic diagram illustrating the principle of the leaf spring arc length formula constraint in the embodiments of this application;

[0057] Figure 5 This is a schematic diagram illustrating the principle of applying constraints to each part in the embodiments of this application;

[0058] Figure 6 This is a schematic diagram illustrating the principle of obtaining the trajectory of the main chip center point by driving the radius of curvature in an embodiment of this application;

[0059] Figure 7 This is a schematic diagram of the structure of a leaf spring motion trajectory simulation system provided in an embodiment of this application. Detailed Implementation

[0060] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0061] To better understand this application, the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0062] Example 1

[0063] See Figure 1 , Figure 1 This is a flowchart illustrating a method for simulating the motion trajectory of a leaf spring according to an embodiment of this application. Figure 1 As can be seen, the method for simulating the motion trajectory of the leaf spring in this embodiment mainly includes the following process:

[0064] S1: Obtain the leaf spring selection parameters for light vehicles.

[0065] The method in this embodiment is mainly applied to light vehicles, including benchmark vehicles. This method is implemented using CATIA software, primarily utilizing the sketch module of CATIA. The obtained leaf spring selection parameters include: leaf spring mounting hardpoints, hanger plate hardpoints, and leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf. The leaf spring mounting hardpoints, also known as leaf spring suspension hardpoints, mainly include: the center point of the front coil, the center point of the rear hanger plate, and the center point of the rear coil.

[0066] The schematic diagram of the leaf spring's motion trajectory in this embodiment can be found in [reference needed]. Figure 2 As shown. Figure 2 1 is the center of the front coiling lug of the leaf spring, 2 is the upper limit working condition, 3 is the full load working condition, 4 is the no-load working condition, 5 is the lower limit working condition, 6 is the buffer block, 7 is the trajectory of the center point of the main leaf spring, 8 is the upper point of the leaf spring shackle plate, 9 is the center line of the leaf spring shackle plate, and 10 is the center of the rear coiling lug of the leaf spring.

[0067] A schematic diagram of the center points of each mounting surface in the leaf spring center point mounting surface can be found in [reference needed]. Figure 3 As shown. Figure 3 In the diagram, 4 represents the no-load condition, 2 represents the upper limit condition, 5 represents the lower limit condition, 7 represents the trajectory of the center point of the main leaf spring, 12 represents the center of the mounting surface of the upper limit main leaf spring, 13 represents the center of the mounting surface of the no-load main leaf spring, and 14 represents the center of the mounting surface of the lower limit main leaf spring.

[0068] In this embodiment, the angle of the mounting surface at the center point of the main leaf is not constrained when determining the selection parameters of the leaf spring. This method is equivalent to removing the constraint on the angle of the mounting surface at the center point of the main leaf. The angle change from no load to the upper limit mounting surface is generally 0.2-0.5 degrees, which is more in line with the actual situation that the mounting surface at the center point of the main leaf has a small angle change during the movement, and is conducive to improving the accuracy of the simulation of the leaf spring motion trajectory.

[0069] The leaf spring selection parameters, such as the leaf spring mounting hard point, the lifting lug hard point, and the leaf spring coil diameter, input in this embodiment can be found in Table 1 below.

[0070]

[0071] Table 1. Selection Parameters for Leaf Springs

[0072] S2: Generate a preliminary shape profile of the leaf spring based on the leaf spring selection parameters.

[0073] After determining the selection parameters of the leaf spring, it is equivalent to adding the complete constraints. The preliminary shape outline of the leaf spring is automatically generated according to the method in this embodiment.

[0074] S3: Apply constraints to each unit of the preliminary shape outline, approximate the upper surface of the leaf spring as a circular arc, and apply angular constraints to the circular arc using the formula arc length = radian * radius.

[0075] Further, step S3 includes:

[0076] S31: Based on the preliminary shape outline, the upper surface of the leaf spring is approximated as a circular arc.

[0077] S32: Using the formula arc length = radians * radius, the arc length is fixed, and constraints are applied to the arc by changing its radius.

[0078] The specific implementation method of step S32 is as follows: Using the formula arc length = radian * radius, the arc length of the arc is fixed. By changing the radius of the arc, constraints are applied to the leaf spring mounting hard point, the lug plate hard point, the line segment, the lug, the coil lug, and the main spring within the arc. A schematic diagram illustrating the principle of the leaf spring arc length formula constraint in this embodiment can be found in [reference needed]. Figure 4 As shown. Figure 4 15 is the arc angle constraint, which adopts a fixed arc length and variable radius method, and 16 is the driving radius.

[0079] The schematic diagram illustrating the principle of applying constraints to each component in this embodiment can be found in [reference needed]. Figure 5 As shown. Figure 5 The operations are as follows: 1) fixed, 2) tangent, 3) formula constraint, 4) radius constraint, 5) tangent, 6) tangent, 7) fixed length, 8) fixed, 9) fixed length, 10) tangent.

[0080] As shown in steps S31-S32, this embodiment uses the sketch module of CATIA software to input the hard points of the leaf spring mounting on the benchmark vehicle or the design vehicle model, and applies constraints by approximating the upper surface of the leaf spring as a circular arc. In this embodiment, a formula constraint is applied to the first and second halves of the leaf spring. This is a precise constraint; the arc length formula allows for a more accurate calculation of the arc length, which helps improve the accuracy of the leaf spring motion trajectory simulation, thus providing a more accurate basis for subsequent inspection and manufacturing.

[0081] See also Figure 1 As can be seen, after applying the formula constraint to the arc, step S4 is executed: by driving the curvature radius, the motion trajectory of the center point of the leaf spring main plate and the leaf spring curve under typical working conditions are obtained.

[0082] Typical operating conditions in this embodiment include: no-load condition, full-load condition, upper limit condition, and lower limit condition. For example, the full-load condition is calculated based on a wheel center jump of 112mm, the upper limit condition is calculated based on the buffer block being compressed to half its original position, and the lower limit condition is calculated based on a wheel center jump of 70mm.

[0083] Specifically, step S4 includes the following process:

[0084] S41: Obtain arc heights of different values ​​by modifying the radius of curvature;

[0085] S42: Based on different values ​​of arc height, the motion trajectory of the center point of the leaf spring is formed;

[0086] S43: Output the leaf spring curve under typical working conditions based on the motion trajectory of the center point of the leaf spring main plate;

[0087] S44: Record the real-time position of the center point of the leaf spring main plate at every set arc height change distance;

[0088] S45: Connects multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate.

[0089] This embodiment illustrates the principle of obtaining the trajectory of the main image's center point by driving the radius of curvature. (See also: [link to original text]). Figure 6 As shown. Figure 6 In the diagram, 2 represents the upper limit condition, 3 represents the full load condition, 4 represents the no-load condition, 5 represents the lower limit condition, 17 represents the upper mounting plate, and 7 represents the centerline trajectory of the leaf spring main leaf.

[0090] In this embodiment, the motion trajectory and leaf spring curve under typical working conditions are obtained by driving the curvature radius. Compared with the prior art that drives the arc height, the accuracy of the curvature radius can be effectively improved, thereby improving the accuracy of the final obtained motion trajectory and leaf spring curve.

[0091] See also Figure 1 As can be seen, after obtaining the motion trajectory of the center point of the leaf spring main plate and the leaf spring curve under typical working conditions through curvature radius driving, step S5 is executed: stretching and thickening the leaf spring curve to create the leaf spring model.

[0092] By stretching and thickening the leaf spring curve, a leaf spring model is created, and the motion trajectory of the leaf spring is simulated, which can then be used for subsequent DMU motion analysis, etc.

[0093] Furthermore, the method also includes step S6: verifying the hard points of the leaf spring installation based on the leaf spring model and the tire envelope.

[0094] Specifically, step S6 includes the following process:

[0095] S61: Obtain the tire envelope based on the motion trajectory of the center point of the leaf spring.

[0096] S62: Determine whether it is feasible to install hard points on the leaf spring based on the leaf spring model and tire envelope.

[0097] If feasible, the process ends.

[0098] If this is not feasible, return to step S1 and re-obtain the leaf spring selection parameters for the light vehicle until the leaf spring installation hard point is feasible.

[0099] The following example illustrates the method for simulating the motion trajectory of a leaf spring in this embodiment.

[0100] 1) First, in the sketch module of CATIA software, input the leaf spring mounting hard points, hanger plate hard points, leaf spring coil diameter and other parameters of the benchmark model or design model.

[0101] 2) Draw the preliminary shape outline of the leaf spring in the CATIA sketch.

[0102] 3) Apply constraints to the hard points, line segments, lugs, coils, and main leaf springs in the diagram. See [reference needed]. Figure 5 A schematic diagram illustrating the principle of applying constraints to each component.

[0103] 4) Drive the radius of curvature to obtain the trajectory line and curves for each working condition. The full-load working condition is calculated based on the wheel center jumping up by 112mm, the upper limit working condition is calculated based on the buffer block being compressed to half its length, and the lower limit working condition is calculated based on the wheel center jumping down by 70mm.

[0104] 5) Create a leaf spring model by stretching and thickening the leaf spring curve. Create a DMU (Digital Mock-Up) model using the trajectory line, sweep the tire along the trajectory line, and add conditions such as tilting and braking to output the tire envelope.

[0105] 6) Based on the obtained model and envelope verification, check whether the hard point of the leaf spring installation is feasible. If it is not feasible, optimize the hard point and the parts, and re-verify until the layout and performance requirements are met.

[0106] Example 2

[0107] exist Figures 1-6 Based on the illustrated embodiment, see also Figure 7 , Figure 7 for Figure 7 This is a schematic diagram of a leaf spring motion trajectory simulation system provided in an embodiment of this application. Figure 7 As can be seen, the leaf spring motion trajectory simulation system in this embodiment mainly includes: a leaf spring selection parameter acquisition module, a leaf spring preliminary shape contour diagram generation module, an arc constraint module, a leaf spring motion trajectory and leaf spring curve generation module, and a leaf spring model making module.

[0108] The system includes several modules: a leaf spring selection parameter acquisition module for light vehicles, which acquires leaf spring selection parameters including the leaf spring mounting hard point, the hanger plate hard point, and the leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf; a leaf spring preliminary shape contour generation module to generate a preliminary shape contour of the leaf spring based on the selection parameters; an arc constraint module to apply constraints to each unit of the preliminary shape contour, approximating the upper surface of the leaf spring as an arc and applying angular constraints to the arc using the formula arc length = radian * radius; a leaf spring motion trajectory and curve generation module to acquire the motion trajectory of the center point of the main leaf spring and the leaf spring curve under typical working conditions, including no-load, full-load, upper limit, and lower limit conditions; and a leaf spring model creation module to stretch and thicken the leaf spring curve to create a leaf spring model.

[0109] The arc constraint module includes a definition unit and a constraint unit. The definition unit is used to approximate the upper surface of the leaf spring as an arc based on the preliminary shape profile drawing; the constraint unit is used to fix the arc length using the formula arc length = radian * radius, and to apply constraints to the arc by changing the radius.

[0110] The leaf spring motion trajectory and leaf spring curve generation module includes: an arc height acquisition unit, a first motion trajectory forming unit, a leaf spring curve output unit, a recording unit, and a second motion trajectory forming unit. Specifically, the arc height acquisition unit is used to obtain arc heights of different values ​​by modifying the radius of curvature; the first motion trajectory forming unit is used to form the motion trajectory of the center point of the leaf spring main plate based on the different arc height values; the leaf spring curve output unit is used to output the leaf spring curve under typical working conditions based on the motion trajectory of the center point of the leaf spring main plate; the recording unit is used to record the real-time position of the center point of the leaf spring main plate at set arc height change distances; and the second motion trajectory forming unit is used to connect multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate.

[0111] Furthermore, the leaf spring motion trajectory simulation system also includes a verification module, which is used to verify the leaf spring mounting hard points based on the leaf spring model and tire envelope.

[0112] The working principle and method of the leaf spring motion trajectory simulation system in this embodiment are explained. Figures 1-6 The embodiments shown have been described in detail and will not be repeated here.

[0113] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A leaf spring motion trajectory simulation method characterized by, The method includes: Obtain the leaf spring selection parameters for light vehicles. The leaf spring selection parameters include: leaf spring mounting hard point, hanger plate hard point, and leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf. Based on the selected leaf spring parameters, a preliminary shape profile of the leaf spring is generated; Constraints are applied to each unit of the preliminary shape contour drawing, approximating the upper surface of the leaf spring as an arc, and applying angular constraints to the arc using the formula arc length = radian * radius; specifically, this includes: approximating the upper surface of the leaf spring as an arc based on the preliminary shape contour drawing; fixing the arc length using the formula arc length = radian * radius; and constraining the leaf spring mounting hardpoint, lug plate hardpoint, line segment, lug, coil lug, and main spring plate within the arc by changing the radius of the arc; Driven by the radius of curvature, the motion trajectory of the center point of the leaf spring main plate and the leaf spring curve under typical working conditions are obtained. Specifically, this includes: obtaining different values ​​of arc height by modifying the radius of curvature; forming the motion trajectory of the center point of the leaf spring main plate based on the different values ​​of arc height; outputting the leaf spring curve under typical working conditions based on the motion trajectory of the center point of the leaf spring main plate; recording the real-time position of the center point of the leaf spring main plate at every set arc height change distance; and connecting multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate. The typical working conditions include: no-load condition, full-load condition, upper limit condition, and lower limit condition. The leaf spring curve is stretched and thickened to create a leaf spring model.

2. The method of claim 1, wherein After stretching and thickening the leaf spring curve to create a leaf spring model, the method further includes: The hard points of the leaf spring installation are checked based on the leaf spring model and the tire envelope.

3. The method of claim 2, wherein The step of checking the hard points of the leaf spring installation based on the leaf spring model and the tire envelope includes: The tire envelope is obtained based on the motion trajectory of the center point of the main leaf spring. Based on the leaf spring model and tire envelope, determine whether the installation of the leaf spring hard point is feasible; If feasible, the process ends; If this is not feasible, obtain the leaf spring selection parameters for the light vehicle again until the leaf spring installation hard point is feasible.

4. A leaf spring motion trajectory simulation system characterized by, The simulation system includes: The leaf spring selection parameter acquisition module is used to acquire the leaf spring selection parameters for light vehicles. The leaf spring selection parameters include: leaf spring mounting hard point, hanger plate hard point, and leaf spring coil diameter, without constraining the angle of the mounting surface at the center point of the main leaf. The leaf spring preliminary shape outline generation module is used to generate a preliminary shape outline of the leaf spring based on the leaf spring selection parameters. The arc constraint module is used to apply constraints to each unit of the preliminary shape contour drawing, approximate the upper surface of the leaf spring as an arc, and apply angular constraints to the arc using the formula arc length = radian * radius. The leaf spring motion trajectory and leaf spring curve generation module is used to obtain the motion trajectory of the center point of the main leaf spring and the leaf spring curve under typical working conditions through curvature radius drive. The typical working conditions include: no-load working condition, full-load working condition, upper limit working condition and lower limit working condition. The leaf spring model making module is used to stretch and thicken the leaf spring curve to make a leaf spring model; The circular arc constraint module includes: A definition unit is used to approximate the upper surface of the leaf spring as a circular arc based on the preliminary shape contour drawing; The constraint unit is used to fix the arc length of the arc by using the formula arc length = radian * radius, and to apply constraints to the arc by changing the radius of the arc. The leaf spring motion trajectory and leaf spring curve generation module includes: The arc height acquisition unit is used to obtain arc heights of different values ​​by modifying the radius of curvature; The first motion trajectory forming unit is used to form the motion trajectory of the center point of the leaf spring main plate according to different values ​​of arc height; The leaf spring curve output unit is used to output the leaf spring curve under typical working conditions based on the motion trajectory of the center point of the main leaf spring. The recording unit is used to record the real-time position of the center point of the leaf spring main plate at set intervals of arc height change. The second motion trajectory forming unit is used to connect multiple real-time positions to obtain the precise motion trajectory of the center point of the leaf spring main plate.

5. The plate spring motion trajectory simulation system according to claim 4, wherein The system also includes a verification module, used to verify the hard points of the leaf spring installation based on the leaf spring model and the tire envelope.

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