A method for testing vertical vibrations of a tire

Abstract

The application discloses a kind of tire vertical vibration test methods, it is related to tire test technical field;Tire vertical vibration test method includes the following steps: using high-speed drum tester to tire is carried out smoothness test, wherein, the circumferential surface of the drum of high-speed drum tester is equipped with two lugs assemblies, two lugs assemblies are located at the radial two sides of drum respectively, and it is rotationally symmetric distribution around the central axis of drum;Using high-speed drum tester to tire is carried out uniformity test, wherein, two lugs assemblies are removed from high-speed drum tester;According to the data obtained by testing, tire model is established;According to tire model, vehicle dynamics simulation analysis is carried out, and tire vertical dynamics index parameter is output.The application can improve test efficiency, reduce cost, and can improve tire uniformity and smoothness test effect.

Description

Technical Field

[0001] This invention relates to the field of tire testing technology, and in particular to a method for testing the vertical vibration of a tire. Background Technology

[0002] Traditional methods for testing tire ride comfort (vertical dynamics) and uniformity involve numerous tests and verifications using a large amount of auxiliary equipment. This process is not only time-consuming and inefficient, but also heavily influenced by subjective human factors. Furthermore, it fails to provide truly targeted solution verification, resulting in inaccurate measurements of tire ride comfort and uniformity. While tire mass imbalance can be measured using a tire dynamic balancing machine under static and dynamic conditions, it cannot accurately measure dimensional deviations and force fluctuations.

[0003] Tires are primarily composed of a capsule structure made of rubber, a highly elastic material, which significantly increases the difficulty of measurement. Current technology requires the use of a tire CLEAT test bench to accurately measure tire smoothness and uniformity; other measurement methods cannot achieve the same level of precision. However, current testing methods based on tire CLEAT test benches suffer from low efficiency and high cost. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for testing the vertical vibration of tires, which can improve the efficiency of testing, reduce costs, and improve the testing results for tire uniformity and ride comfort.

[0005] This invention provides a method for testing the vertical vibration of a tire, which includes the following steps:

[0006] The smoothness test of the tire is carried out using a high-speed drum tester. The drum of the high-speed drum tester is equipped with two protrusion assemblies on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0007] The uniformity of the tires was tested using a high-speed drum tester, during which two bump assemblies were removed from the high-speed drum tester.

[0008] A tire model was built based on the data obtained from the test;

[0009] Vehicle dynamics simulation analysis is performed based on the tire model, and the vertical dynamic parameters of the tire are output.

[0010] The tire vertical vibration testing method according to embodiments of the present invention has at least the following beneficial effects: Before conducting tire ride comfort testing, two detachable bump assemblies of equal mass are installed on the drum of a high-speed drum testing machine. The two bump assemblies are located on opposite sides of the drum in the radial direction and are arranged in a rotationally symmetrical manner around the central axis of the drum. During the high-speed rotation of the drum, they can cancel each other out the centrifugal force and achieve drum mass balance. This solves the problem of uneven mass between the bumps and balance blocks on the drum in the prior art, thereby improving the testing effect of tire uniformity and ride comfort. At the same time, there is no need to install balance blocks on the drum, reducing the cost of balance blocks and improving the assembly efficiency of the drum, which is conducive to improving the efficiency of testing work.

[0011] In some embodiments of the present invention, before performing a ride comfort test on the tire using a high-speed drum tester, the following steps are included: performing a static / dynamic balance test on the tire, and installing balance weights on the tire according to the test results.

[0012] In some embodiments of the present invention, the method of using a high-speed drum testing machine to perform a tire ride comfort test includes the following steps:

[0013] Set the multiple speed settings for the high-speed drum tester;

[0014] The high-speed drum tester is controlled to operate at speeds that increase from low to high, so that the drum rotates at different speed levels and the smoothness of the tire is tested.

[0015] In some embodiments of the present invention, the multiple speed ranges of the high-speed drum tester are set to 30 km / h, 60 km / h and 90 km / h, respectively.

[0016] In some embodiments of the present invention, the method of using a high-speed drum testing machine to perform uniformity testing on tires includes the following steps:

[0017] Set the speed range of the high-speed drum tester;

[0018] Control the high-speed drum test machine to accelerate within the speed range so that the drum rotates at least two clockwise or counterclockwise rotations during the acceleration process, and perform uniformity tests on the tires;

[0019] Acquire multiple data during the testing process, including forward radial force fluctuation, forward lateral force fluctuation, forward lateral force offset, reverse radial force fluctuation, reverse lateral force fluctuation, reverse lateral force offset, first harmonic of radial force, first harmonic of lateral force, taper effect, and angle effect.

[0020] In some embodiments of the present invention, the rotational speed range of the high-speed drum tester is set to 30 km / h to 120 km / h.

[0021] In some embodiments of the present invention, the step of establishing a tire model based on data obtained from testing includes the following steps:

[0022] Based on the tire dynamic impact test method, the tire parameters are tested and improved according to each calibration parameter. The calibration parameters include tire uniformity, rotation period, cone effect, angle effect, radial force first harmonic, lateral force first harmonic, and the circumferential friction coefficient of the drum.

[0023] Obtain the optimal tire parameters and generate a tire model.

[0024] In some embodiments of the present invention, the step of performing vehicle dynamics simulation analysis based on the tire model and outputting tire vertical dynamic parameters includes the following steps:

[0025] Based on the parameter calibration results of the tire model and the results of subjective evaluation, the target value for performance improvement is determined.

[0026] The target tire model is found by searching the tire model database;

[0027] The target tire model is imported into vehicle dynamics software for real-time simulation, and the target tire model is processed with the help of a driving simulator.

[0028] Determine whether the target tire model meets the performance requirements. If yes, output the model file and tire vertical dynamic parameters. If no, adjust the weighting matrix of the tire vertical dynamic parameters and return to the steps of using a high-speed drum tester to test the tire's ride comfort.

[0029] In some embodiments of the present invention, the tire vertical dynamic parameters include radial dimensional deviation, radial force fluctuation, and separation method measurements.

[0030] In some embodiments of the present invention, each of the bump assembly includes a bump that extends from one end face of the drum to the other end face, the extension direction of the bump being consistent with or at a certain acute angle to the thickness direction of the drum.

[0031] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0032] Figure 1 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment 2 of the present invention;

[0034] Figure 3 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment 3 of the present invention;

[0035] Figure 4 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment 4 of the present invention;

[0036] Figure 5 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment 5 of the present invention;

[0037] Figure 6 This is a schematic flowchart of a tire vertical vibration testing method provided in Embodiment Six of the present invention;

[0038] Figure 7 This is a schematic flowchart of a tire vertical vibration testing method provided according to a specific embodiment of the present invention. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, it should be understood that the use of terms such as "first" and "second" may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In existing technologies, traditional methods for testing tire ride comfort (vertical dynamics) and uniformity typically involve numerous tests and verifications using a large amount of auxiliary equipment. This not only results in long testing cycles and low work efficiency, but also exposes the tire to significant subjective influences. Furthermore, it fails to provide truly targeted solution verification, making it impossible to accurately measure the tire's ride comfort and uniformity. For tires under static and dynamic conditions, only tire dynamic balancing machines can measure tire mass imbalance; however, they cannot accurately measure tire dimensional deviations and force fluctuations.

[0043] Since tires are mainly composed of a bladder structure made of rubber, a highly elastic material, the measurement methods are greatly more difficult. Current technology requires the use of a tire CLEAAT test bench (also known as a tire dynamic impact test bench) to accurately measure the smoothness and uniformity of a tire. Other measurement methods are not accurate.

[0044] When tires encounter obstacles during driving, they experience abnormal vibrations that gradually diminish. These vibrations can affect how people perceive the vehicle's comfort. This type of obstacle encounter test is commonly called a cleat test or dynamic impact test. By conducting this test, some of the tire's dynamic behavioral characteristics can be determined in advance. Typically, testers use a tire cleat test bench, employing bumps on a rotating drum to simulate road obstacles and perform dynamic impact tests on the tires.

[0045] However, the drum of the tire Cleat test bench is equipped with not only protrusions but also multiple balance weights. During testing, the uneven mass of the protrusions and balance weights can easily affect the test results. Therefore, current testing methods based on the tire Cleat test bench suffer from low efficiency, high cost, and unsatisfactory test results.

[0046] To address the aforementioned issues, this invention provides a method for testing tire vertical vibration, which can improve testing efficiency, reduce costs, and simultaneously enhance the testing results for tire uniformity and ride comfort.

[0047] The following is for reference. Figures 1 to 7 A method for testing the vertical vibration of a tire according to an embodiment of the present invention is described.

[0048] like Figure 1 As shown, the tire vertical vibration test method according to Embodiment 1 of the present invention includes the following steps:

[0049] Step S11: Use a high-speed drum tester to test the ride comfort of the tire. The drum of the high-speed drum tester has two protrusion assemblies installed on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0050] Understandably, each bump assembly can include one bump or multiple bumps that are uniformly or non-uniformly distributed. The bumps can be installed at an angle on the circumference of the drum or along the thickness direction of the drum. The bumps can be fixed to the circumference of the drum with bolts for easy disassembly. The cross-sectional shape of the bumps can be, but is not limited to, square. When the bumps are installed at an angle on the drum, the angle can be set according to the actual situation. During the drum's rotation, the bumps rotate with the drum and come into contact with the circumference of the tire, allowing the tire to contact the bumps at different speeds or forces, thus simulating the tire encountering an obstacle during driving. In ride comfort testing, random vibration data can be collected, recorded, and processed. By obtaining relevant analytical values ​​and comparing them with corresponding limiting indicators, an objective evaluation of the tire's ride comfort can be made.

[0051] In this embodiment, each bump assembly includes a bump extending from the outer edge of one end face of the drum to the outer edge of the other end face. Depending on the testing requirements, the extension direction of the bump can be aligned with the thickness direction of the drum, or it can be set at a certain acute angle to the thickness direction of the drum. The acute angle can be 10°, 15°, 30°, etc. The two bumps are rotationally symmetrically distributed around the central axis of the drum; that is, one bump rotates 180° around the central axis of the drum and then coincides with the other bump. When the drum is in a free state, two identical bumps are selected and installed in the pre-drilled holes on both radial sides of the drum. Care should be taken during installation to ensure that the installation position and method do not affect the centrifugal force of the drum.

[0052] Step S12: Perform a uniformity test on the tire using a high-speed drum tester, wherein the two bump assemblies are removed from the high-speed drum tester.

[0053] In tire uniformity testing, the bump assembly can be removed from the drum without the need for a high-speed drum testing machine to perform the uniformity test. During the uniformity test, data such as radial force fluctuation, lateral force fluctuation, and lateral force offset are measured and recorded.

[0054] Step S13: Establish a tire model based on the data obtained from the test.

[0055] A significant amount of test data is obtained during tire ride comfort and uniformity tests, which can be used to build tire models.

[0056] Step S14: Perform vehicle dynamics simulation analysis based on the tire model and output the tire vertical dynamic parameters.

[0057] After obtaining the tire model, vehicle dynamics simulations can be performed on it to analyze and calculate the tire's vertical dynamic parameters, such as radial dimensional deviation, radial force fluctuation, and separation method measurements, as basic dynamic parameters. Radial dimensional deviation refers to the difference between the maximum and minimum radii relative to the tire's fixed axis. Radial force fluctuation refers to the fluctuation of radial force that the loaded tire experiences repeatedly per revolution under a fixed load radius and constant speed. Separation method measurements are the energy loss per unit distance traveled while maintaining the tire's rolling speed without slipping, achieved by reducing the vertical load to near-zero energy loss; this method is generally used in force measurement, torque measurement, and power measurement.

[0058] Understandably, this testing method is an improvement on the tire CLEAT test bench (or high-speed drum tester). Before conducting tire ride comfort tests, two identical bump assemblies are detachably installed on the drum of the high-speed drum tester. The two bump assemblies are located on opposite sides of the drum's radial direction and are rotationally symmetrical about the drum's central axis. During the high-speed rotation of the drum, they can cancel each other out the centrifugal force, ensuring the center-of-gravity eccentricity of the bump assemblies and ensuring that the static imbalance on opposite sides of the drum's radial direction is consistent. This achieves drum mass balance and solves the problem of uneven mass between the bumps and balance blocks on the drum in existing technologies, thereby improving the test results for tire uniformity and ride comfort.

[0059] In existing technologies, installing a bump on a drum requires calculating the mass of the corresponding counterweight. In this embodiment, by installing two bump assemblies of equal mass on opposite radial sides of the drum, it is unnecessary to install a counterweight on the drum, reducing the cost of the counterweight and improving the drum's assembly efficiency, thus enhancing test installation efficiency and meeting the needs of actual development.

[0060] In addition, by making full use of the size of the drum, tires of different sizes can be installed for testing without affecting the test data. This testing method greatly saves the tire testing cycle.

[0061] like Figure 2As shown, according to Embodiment 2 of the present invention, the tire vertical vibration test method, based on the above embodiment, specifically adds a tire static / dynamic balance test step before performing a tire ride comfort test using a high-speed drum testing machine. This test method specifically includes the following steps:

[0062] Step S21: Perform a static / dynamic balance test on the tires and install balance weights on the tires according to the test results.

[0063] Understandably, an imbalance in the mass of a rotating wheel can negatively impact a car's ride comfort and stability. Therefore, before conducting tire ride comfort and uniformity tests, static and dynamic balancing tests are necessary to improve the wheels' balance. Before performing static / dynamic balancing tests, the tires must be thoroughly cleaned to prevent stones or other debris from affecting their balance parameters. Then, equipment such as a tire balancing machine can be used to complete the static / dynamic balancing tests.

[0064] In this context, static imbalance is the product of the tire's mass and its center of gravity eccentricity, expressed in g·cm; static imbalance mass is the ratio of static imbalance to the correction radius, expressed in g. A dynamic balancing test is conducted under specific test conditions (e.g., ambient temperature, tire, rim, and tire pressure). The equipment is set with the correction radius and correction surface distance for the tire imbalance. The tire rotates on the equipment at a set speed, and the distribution of static and torque imbalances along the tire circumference is measured. Then, the imbalance mass and critical angle of the upper and lower correction surfaces are calculated. Next, the tire is stopped rotating, and balance weights are attached to the tire sidewall to ensure static and dynamic balance.

[0065] Step S22: Use a high-speed drum tester to test the ride comfort of the tire. The drum of the high-speed drum tester has two protrusion assemblies installed on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0066] Step S23: Perform a uniformity test on the tire using a high-speed drum tester, wherein the two bump assemblies are removed from the high-speed drum tester.

[0067] Step S24: Build a tire model based on the data obtained from the test.

[0068] Step S25: Perform vehicle dynamics simulation analysis based on the tire model and output the tire vertical dynamic parameters.

[0069] Understandably, before using a high-speed rotary drum testing machine to test tire ride comfort and uniformity, a suitable clamp for the rim should be selected, the tire installed and secured, and the torque adjusted to the specified torque using a torque wrench. After securing the clamps to the tire, the torque should also be adjusted to the specified torque. The tire should be inflated, and the tire pressure measured to ensure it is within the specified range. By performing static / dynamic balance tests on the tire, its balance performance can be improved, thereby eliminating its impact on tire ride comfort and uniformity, which helps improve the accuracy of tire ride comfort and uniformity testing.

[0070] like Figure 3 As shown, the tire vertical vibration test method according to Embodiment 3 of the present invention, based on the above embodiments, specifically optimizes the step of performing a tire ride comfort test using a high-speed drum testing machine. This test method includes the following steps:

[0071] Step S31: Set the multiple speed ranges of the high-speed drum tester.

[0072] It is understandable that the high-speed drum testing machine can have two, three, or more speed settings, and the specific values ​​of the speed settings can be set according to the testing requirements. In this embodiment, the multiple speed settings of the high-speed drum testing machine are set to 30 km / h, 60 km / h, and 90 km / h, respectively.

[0073] Step S32: Control the high-speed drum tester to operate at a speed that increases from low to high, so that the drum rotates at different speed levels and performs a smoothness test on the tire.

[0074] Start the high-speed drum testing machine and rotate its main shaft at one of its speed settings, for example, 30 km / h. Move the drum of the testing machine to press it against the tire until the specified load is reached, keeping the distance between the main shaft and the drum shaft constant to conduct the tire ride comfort test. Complete the tire ride comfort test at a main shaft speed of 30 km / h. After completing the test, increase the speed of the high-speed drum testing machine to 60 km / h and conduct the tire ride comfort test again. Finally, increase the speed of the high-speed drum testing machine again to 90 km / h and complete the tire ride comfort test under these conditions. Therefore, by conducting tire ride comfort tests at three different speed settings, more comprehensive tire ride comfort test data can be obtained.

[0075] Step S33: Perform a uniformity test on the tire using a high-speed drum tester, wherein the two bump assemblies are removed from the high-speed drum tester.

[0076] Step S34: Establish a tire model based on the data obtained from the test.

[0077] Step S35: Perform vehicle dynamics simulation analysis based on the tire model and output the tire vertical dynamic parameters.

[0078] like Figure 4 As shown, the tire vertical vibration test method according to Embodiment 4 of the present invention, based on the above embodiments, specifically optimizes the step of performing a uniformity test on the tire using a high-speed drum testing machine. This test method includes the following steps:

[0079] Step S41: Use a high-speed drum tester to test the ride comfort of the tire. The drum of the high-speed drum tester has two protrusion assemblies installed on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0080] Step S42: Set the speed range of the high-speed drum tester.

[0081] After completing the tire ride comfort test, the bump assembly can be disassembled, and the tire uniformity test can be performed. The speed range of the high-speed drum tester can be set according to the actual situation. In this embodiment, the speed range of the high-speed drum tester is set to 30 km / h to 120 km / h. During the tire uniformity test, the spindle speed of the high-speed drum tester is kept within the range of 30 km / h to 120 km / h.

[0082] Step S43: Control the high-speed drum tester to increase its speed within the speed range so that the drum rotates clockwise or counterclockwise at least twice during the speed increase process, and perform a uniformity test on the tire.

[0083] Understandably, during tire uniformity testing, it's crucial to control not only the spindle speed but also its direction of rotation. Specifically, the spindle should be rotated clockwise at least twice, with the speed ranging from 30 km / h to 120 km / h, and the relevant data recorded during the measurement. Then, the spindle should be rotated counterclockwise at least twice, again with the speed ranging from 30 km / h to 120 km / h, and the corresponding data recorded afterward.

[0084] Step S44: Acquire multiple data during the test process, including forward radial force fluctuation, forward lateral force fluctuation, forward lateral force offset, reverse radial force fluctuation, reverse lateral force fluctuation, reverse lateral force offset, first harmonic of radial force, first harmonic of lateral force, taper effect, and angle effect.

[0085] In tire uniformity testing, the following data can be obtained: radial force fluctuation RFVcw, lateral force fluctuation LFVcw, lateral force offset LFDcw, radial force fluctuation RFVccw, lateral force fluctuation LFVccw, lateral force offset LFDccw, radial force first harmonic RFV1H, lateral force first harmonic LFV1H, taper effect CON, and angle effect PLY. Here, cw represents forward rotation, and ccw represents reverse rotation. In this embodiment, clockwise can be set as forward rotation, and counterclockwise as reverse rotation.

[0086] The radial force fluctuation for forward rotation is RFVcw, where RFVcw = RFmax - RFmin; the radial force fluctuation for reverse rotation is RFVccw, where RFVccw = RFcmax - RFcmin. The lateral force fluctuation for forward rotation is LFVcw, where LFVcw = LFmax - LFmin; the lateral force fluctuation for reverse rotation is LFVccw, where LFVccw = LFcmax - LFcmin; where LFmax is the maximum value of the lateral force for forward rotation, LFmin is the minimum value of the lateral force for forward rotation, LFcmax is the maximum value of the lateral force for reverse rotation, and LFcmin is the minimum value of the lateral force for reverse rotation.

[0087] Step S45: Build a tire model based on the data obtained from the test.

[0088] Step S46: Perform vehicle dynamics simulation analysis based on the tire model and output the tire vertical dynamic parameters.

[0089] After completing the tire uniformity test, the test drum can be moved and removed from the tire. The tire is then deflated and removed from the rim. Understandably, dot markings can be applied to the test tire if necessary.

[0090] like Figure 5 As shown, according to Embodiment 5 of the present invention, the method for testing tire vertical vibration is optimized based on the above embodiments, specifically for the step of establishing a tire model based on the data obtained from the test. This testing method includes the following steps:

[0091] Step S51: Use a high-speed drum tester to test the ride comfort of the tire. The drum of the high-speed drum tester has two protrusion assemblies installed on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0092] Step S52: Perform a uniformity test on the tire using a high-speed drum tester, wherein the two bump assemblies are removed from the high-speed drum tester.

[0093] Step S53: Obtain multiple data points during the testing process.

[0094] Understandably, these data include forward radial force fluctuations, forward lateral force fluctuations, forward lateral force offsets, reverse radial force fluctuations, reverse lateral force fluctuations, reverse lateral force offsets, first harmonic of radial force, first harmonic of lateral force, taper effect, and angle effect.

[0095] Step S54: Based on the tire dynamic impact test method, perform parameter testing on the tire and improve it according to each calibration parameter. The calibration parameters include tire uniformity, rotation period, conic effect, angle effect, radial force first harmonic, lateral force first harmonic, and the circumferential friction coefficient of the drum.

[0096] Based on the benchmark tire dynamic impact test method (or tire cleat test method), this test method is used to improve and enhance various performance parameters of the tire. Among them, the calibration parameters include tire uniformity, rotation direction, cone effect, angle effect, radial force first harmonic, lateral force first harmonic, and test drum.

[0097] The following adjustment parameters are improved one by one: (1) Tire uniformity, mainly improving the performance of constant tire circumferential characteristics, including tire mass imbalance, dimensional deviation and force fluctuation. (2) Rotation direction condition, mainly improving the rotation cycle of the drum CW (clockwise direction is forward rotation) and CCW (counterclockwise direction is reverse rotation) to improve efficiency. (3) Cone effect and angle effect condition, mainly improving CON (lateral force deviation that does not change direction due to tire rotation direction) and PLY (lateral force deviation that changes direction with tire rotation direction) to reduce the test error range and improve test accuracy. (4) Radial force first harmonic and lateral force first harmonic condition, mainly improving the stability and smoothness of the test curves of RFV1H (maximum peak interval of tire radial force fluctuation first harmonic) and LFV1H (maximum peak interval of tire lateral force fluctuation first harmonic). (5) Test drum, reducing the wear and tear of the drum, making the drum equipped with high friction and rough circumferential surface to enhance service life.

[0098] Tires have a significant impact on a vehicle's lateral acceleration, yaw rate, and self-aligning torque. By improving testing methods and conducting parameter tests, more accurate tire parameters can be obtained, providing model parameters for tire dynamics performance.

[0099] Step S55: Obtain the optimal tire parameters and generate a tire model.

[0100] By improving and enhancing various calibration parameters, optimal tire parameters can be obtained. Based on these tire parameters, a more accurate tire model can be generated, enabling more precise simulation analysis and outputting more accurate tire vertical dynamic parameters.

[0101] Step S56: Perform vehicle dynamics simulation analysis based on the tire model and output the tire vertical dynamic parameters.

[0102] In this embodiment, the tire vertical dynamic parameters include radial dimensional deviation, radial force fluctuation, and values ​​measured by the separation method.

[0103] like Figure 6 As shown, according to Embodiment Six of the present invention, the method for testing tire vertical vibration, based on the above embodiments, specifically optimizes the step of performing vehicle dynamics simulation analysis based on the tire model and outputting tire vertical dynamic parameters. This testing method includes the following steps:

[0104] Step S61: Use a high-speed drum tester to test the ride comfort of the tire.

[0105] Before conducting the tire ride comfort test, two bump assemblies are installed on the circumferential surface of the drum of the high-speed drum tester. The two bump assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum.

[0106] Step S62: Use a high-speed drum tester to test the uniformity of the tire.

[0107] Before conducting the tire uniformity test, the two bump assemblies are removed from the high-speed drum tester, allowing the circumferential surface of the tire to contact the circumferential surface of the drum, so that the drum can drive the tire to rotate, thus completing the tire uniformity test.

[0108] Step S63: Establish a tire model based on the data obtained from the test.

[0109] Step S64: Based on the parameter calibration results of the tire model and the results of subjective evaluation, determine the target value for performance improvement.

[0110] Step S65: Search the tire model database to find the target tire model.

[0111] Step S66: Import the target tire model into the vehicle dynamics software for real-time simulation, and process the target tire model with the help of a driving simulator.

[0112] Step S67: Determine whether the target tire model meets the performance requirements. If yes, output the model file and tire vertical dynamic parameters. If no, adjust the weighting matrix of the tire vertical dynamic parameters and return to the step of using a high-speed drum tester to test the tire's ride comfort.

[0113] Based on the parameter calibration results of the tire model and the results of subjective evaluation, the target performance improvement value is determined. Then, a search is conducted in the tire model database to find a suitable tire file (or adjust a similar model), generating and outputting the target model file. The target model file is imported into vehicle dynamics software for real-time simulation, and the model is validated using a driving simulator. If the model meets the expected performance requirements, the model file is output, and the tire's vertical dynamic parameters are calculated according to the output tire model file. If the expected performance requirements are not met, the weighting matrix of the parameters needs to be adjusted, and the experiment continues.

[0114] The embodiments of the present invention improve the testing and evaluation process by adopting the data processing flow after the above-mentioned vertical dynamic test, which includes indicators for data monitoring and data post-processing.

[0115] The tire vertical vibration testing method provided in this invention belongs to the application field of tire ride comfort (vertical dynamics) and uniformity testing. It is primarily based on an integrated technology combining tire containment characteristics, Cleat characteristics, uniformity, and pockmark testing, serving as a crucial support for tire ride comfort modeling, vehicle ride comfort, and NVH performance control during the design phase. The key aspects of this testing method are as follows: Figure 7 As shown.

[0116] like Figure 7 As shown, in a specific example of the present invention, a static / dynamic balance test is first performed on the tire. After completion, corresponding balance weights are installed on the tire to ensure its static / dynamic balance. Then, test conditions are set. A tire ride comfort test can be performed first, with two protrusion assemblies installed on opposite sides of the drum of a high-speed drum testing machine. Tire ride comfort tests are conducted at drum speeds of 30 km / h, 60 km / h, and 90 km / h. Next, at speeds ranging from 30 km / h to 120 km / h, tire uniformity tests and maximum speed pass tests are performed using the drum of the high-speed drum testing machine. During this process, the protrusion assemblies on the drum need to be removed.

[0117] After completing the tire ride comfort and uniformity tests, each calibration parameter was improved and enhanced individually, and parameter tests were conducted using the benchmark tire dynamic impact test method. The optimal parameters were selected from these tests, and a corresponding tire model was generated accordingly. Subsequently, a simulator was used to process the tire model and check if it met the performance requirements. If the performance requirements were not met, the index weighting matrix was adjusted, and the ride comfort and uniformity tests continued. If the performance requirements were met, the corresponding tire model file was output. Then, based on the output tire model file, the tire's vertical dynamic parameters, such as radial dimensional deviation, radial force fluctuation, and separation method measurements, were calculated as basic dynamic parameter indicators to complete data checking and analysis.

[0118] The testing method in this embodiment can test the smoothness, uniformity, and dynamic characteristics of tires under special conditions, as well as measure the overall vehicle performance evaluation indicators, identify tire quality problems, provide important data support for the vertical dynamics of the chassis system, provide parameters for tire development in the design stage, and thus meet the needs of virtual modeling and construction.

[0119] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0120] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for testing the vertical vibration of a tire, characterized in that, The steps include the following: The smoothness test of the tire is carried out using a high-speed drum tester. The drum of the high-speed drum tester is equipped with two protrusion assemblies on its circumferential surface. The two protrusion assemblies are located on the radial sides of the drum and are distributed in a rotationally symmetrical manner around the central axis of the drum. The uniformity of the tires was tested using a high-speed drum tester, during which two bump assemblies were removed from the high-speed drum tester. A tire model was built based on the data obtained from the test; Vehicle dynamics simulation analysis is performed based on the tire model, and the vertical dynamic parameters of the tire are output. The process of building a tire model based on the data obtained from the test includes the following steps: Based on the tire dynamic impact test method, the tire parameters are tested and improved according to each calibration parameter. The calibration parameters include tire uniformity, rotation period, cone effect, angle effect, radial force first harmonic, lateral force first harmonic, and the circumferential friction coefficient of the drum. Obtain the optimal tire parameters and generate a tire model; The process of performing vehicle dynamics simulation analysis based on the tire model and outputting tire vertical dynamic parameters includes the following steps: Based on the parameter calibration results of the tire model and the results of subjective evaluation, the target value for performance improvement is determined. The target tire model is found by searching the tire model database; The target tire model is imported into vehicle dynamics software for real-time simulation, and the target tire model is processed with the help of a driving simulator. Determine whether the target tire model meets the performance requirements. If yes, output the model file and tire vertical dynamic parameters. If no, adjust the weighting matrix of the tire vertical dynamic parameters and return to the steps of using a high-speed drum tester to test the tire's ride comfort.

2. The method for testing tire vertical vibration according to claim 1, characterized in that, Before conducting a ride comfort test on the tire using a high-speed drum testing machine, the following steps are included: performing a static / dynamic balance test on the tire, and installing balance weights on the tire based on the test results.

3. The method for testing tire vertical vibration according to claim 1, characterized in that, The method of using a high-speed drum testing machine to test the ride comfort of tires includes the following steps: Set the multiple speed settings for the high-speed drum tester; The high-speed drum tester is controlled to operate at speeds that increase from low to high, so that the drum rotates at different speed levels and the smoothness of the tire is tested.

4. The method for testing tire vertical vibration according to claim 3, characterized in that, The high-speed drum test machine has multiple speed settings of 30 km / h, 60 km / h and 90 km / h.

5. The method for testing tire vertical vibration according to claim 1, characterized in that, The method of using a high-speed drum testing machine to test the uniformity of tires includes the following steps: Set the speed range of the high-speed drum tester; Control the high-speed drum test machine to accelerate within the speed range so that the drum rotates at least two clockwise or counterclockwise rotations during the acceleration process, and perform uniformity tests on the tires; Acquire multiple data during the testing process, including forward radial force fluctuation, forward lateral force fluctuation, forward lateral force offset, reverse radial force fluctuation, reverse lateral force fluctuation, reverse lateral force offset, first harmonic of radial force, first harmonic of lateral force, taper effect, and angle effect.

6. The method for testing tire vertical vibration according to claim 5, characterized in that, The speed range of the high-speed drum test machine is set from 30 km / h to 120 km / h.

7. The method for testing tire vertical vibration according to claim 1, characterized in that, The tire vertical dynamic parameters include radial dimensional deviation, radial force fluctuation, and values ​​measured by the separation method.

8. The method for testing tire vertical vibration according to claim 1, characterized in that, Each of the bump assemblies includes a bump that extends from one end face of the drum to the other end face, the extension direction of the bump being either aligned with or at an acute angle to the thickness direction of the drum.

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