Tire low-speed containing characteristic testing method

Abstract

The embodiment of the invention provides a method for testing the low-speed containing characteristic of a tire. The method comprises the steps that a tire is installed on a test board, a replaceable protruding block is arranged on the test board, and the protruding block is used for conducting a low-speed containing characteristic test on the tire; performing internal stress relief treatment on the tire on the test board to obtain a treated tire; according to different convex blocks and preset test parameters, carrying out a stress test on the processed tire on a test board, and obtaining stress values of the tire and the drum attached to a plurality of tire offset angles; averaging the stress values to obtain a stress average value; and generating a stress fluctuation value curve of the tire according to the stress average value and preset sampling time. According to the embodiment of the invention, the test efficiency and accuracy can be improved, the fluctuation of the tire force in different advancing directions and under different working conditions can be measured, the low-speed containing characteristic of the tire can be reflected more comprehensively, and the modeling simulation precision is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of automobile technology, and in particular to a method for testing the low-speed containment characteristics of a tire. Background Art

[0002] With the development of the automobile industry, people have put forward higher requirements for the ride comfort of automobiles. The tire is the only part of the vehicle that contacts the ground. It transmits and filters the impact of uneven roads on the vehicle. Therefore, the tolerance characteristics of the tire are crucial to improving the ride comfort of the vehicle. In the field of vehicle smooth dynamics simulation, the tire model currently used is based on the test data of the tire dynamically passing over the bump. The tolerance characteristics of the tire at low speed are indispensable for the modeling and simulation of vehicle smoothness. The existing test method for the low-speed tolerance characteristics of tires is mainly to use the tire clean test bench to install a fixed-size bump and set a fixed reference angle for the tire to conduct a low-speed tolerance characteristic test, so that the drum rotates at a low speed. When the tire and the drum are in contact at the set fixed reference angle, the test data are collected, and multiple tests are carried out. The average value is used as the basis for judging the low-speed tolerance characteristics of the tire. This method has low test efficiency because it requires multiple tests to obtain an average value. Although it can measure the fluctuation of tire force, it cannot quickly and accurately measure the fluctuation of tire force at each point on the tire surface and under different working conditions. The test results are too one-sided and cannot accurately and comprehensively reflect the low-speed tolerance characteristics of the tire. Using one-sided test results for vehicle smoothness modeling and simulation will result in incomplete modeling and simulation conditions and reduce modeling and simulation accuracy, affecting the judgment of the smoothness performance of the entire vehicle. Summary of the invention

[0003] The embodiment of the present invention provides a method for testing the low-speed containment characteristics of a tire, which can improve test efficiency and accuracy, measure the fluctuation of tire force in different travel directions and under different working conditions, more comprehensively reflect the low-speed containment characteristics of the tire, and improve the accuracy of modeling and simulation.

[0004] In a first aspect, an embodiment of the present invention provides a method for testing low-speed containment characteristics of a tire, comprising:

[0005] Mounting the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to perform a low-speed containment characteristic test on the tire;

[0006] Performing internal stress elimination treatment on the tire on the test bench to obtain the treated tire;

[0007] According to the different protrusions and preset test parameters, the treated tire is subjected to a force test on the test bench to obtain force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters;

[0008] averaging the force values ​​to obtain a force average value;

[0009] A force fluctuation value curve of the tire is generated according to the force average value and a preset sampling time.

[0010] In some embodiments, before mounting the tire on the test bench, the method further comprises:

[0011] The tire is balanced by a dynamic balancing machine and a balancing block to obtain a tire with balanced mass distribution.

[0012] In some embodiments, performing internal stress elimination treatment on the tire on the test bench to obtain the treated tire includes:

[0013] setting a rated load, operating speed and operating duration on the test bench;

[0014] Performing a preheating test on the tire according to the rated load, the running speed and the running time to obtain the preheated tire;

[0015] The preheated tire is cooled according to a preset time to obtain the treated tire.

[0016] In some embodiments, the method further comprises:

[0017] Performing Fourier transform processing on the force value to obtain a frequency spectrum, wherein the frequency spectrum is used to characterize the distribution of force amplitudes in different frequency ranges when the tire passes through the bump;

[0018] A tire smoothness model is constructed based on the frequency spectrum, and the tire smoothness model is used to identify the low-speed containment characteristics of the tire.

[0019] In some embodiments, the different bumps include cube bumps, rectangular bumps, and trapezoidal bumps.

[0020] In some embodiments, the plurality of load parameters are obtained by multiplying the nominal load by different coefficients.

[0021] In some embodiments, the air pressure parameters include 200 kPa, 250 kPa, and 300 kPa.

[0022] In some embodiments, the forward drum speed parameter is 1 km / h, and the reverse drum speed parameter is -1 km / h.

[0023] In some embodiments, the plurality of tire offset angles include 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

[0024] In some embodiments, the force value includes at least one of a radial force value, a longitudinal force value, and a lateral force value.

[0025] In a second aspect, an embodiment of the present invention further provides a tire low-speed containment characteristic testing device, the device comprising:

[0026] An installation module, used for installing the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used for performing a low-speed containment characteristic test on the tire;

[0027] A processing module, used for performing internal stress elimination processing on the tire on the test bench to obtain the processed tire;

[0028] A testing module, used for performing a force test on the processed tire on the test bench according to different protrusions and preset test parameters, and obtaining force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters;

[0029] A calculation module, used for averaging the force values ​​to obtain a force average value;

[0030] A generating module is used to generate a force fluctuation value curve of the tire according to the force average value and a preset sampling time.

[0031] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the tire low-speed tolerance characteristic testing method as described in the first aspect when executing the computer program.

[0032] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the tire low-speed containment characteristic testing method as described in the first aspect.

[0033] According to a method for testing low-speed tolerance characteristics of a tire provided in an embodiment of the present invention, the testing method includes: installing a tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to test the low-speed tolerance characteristics of the tire; performing internal stress elimination treatment on the tire on the test bench to obtain a treated tire; performing a force test on the treated tire on the test bench according to different bumps and preset test parameters to obtain force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters; averaging the force values ​​to obtain an average force value; and generating a tire force fluctuation value curve according to the average force value and a preset sampling time. The test method of the embodiment of the present invention selects bumps of different sizes and shapes each time, obtains the force values ​​of the tire and the drum at multiple different tire offset angles under different air pressures and loads, and averages the force values. A single test can obtain the average force value of the tire at multiple different tire offset angles, and generates a force fluctuation value curve of the tire according to the force average value and the preset sampling time, so as to more intuitively reflect the force fluctuation value of each point on the tire surface, which is used to quickly, accurately and comprehensively judge the low-speed tolerance characteristics of the tire, thereby overcoming the disadvantages and limitations of the existing test method that multiple tests are required to take the average value, and the average value can only reflect the force situation of one point on the tire surface. Therefore, the test method of the embodiment of the present invention can improve the test efficiency and accuracy. In addition, the embodiment of the present invention rotates the drum at forward and reverse speeds, and can measure the fluctuation of the tire force under different travel directions and different bump working conditions of the tire, more comprehensively reflect the low-speed tolerance characteristics of the tire, and improve the modeling and simulation accuracy. Based on this, the embodiment of the present invention can more comprehensively realize the test of the low-speed tolerance characteristics of the tire, and the test efficiency is high and the accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a main flow chart of a method for testing low-speed containment characteristics of a tire provided by an embodiment of the present invention;

[0035] Figure 2 is a flowchart of steps S201 to S203 provided by an embodiment of the present invention;

[0036] Figure 3 is a flowchart of steps S301 to S302 provided by an embodiment of the present invention;

[0037] Figure 4 is a curve diagram of the relationship between radial force fluctuation value and time provided by one embodiment of the present invention;

[0038] Figure 5 is a flow chart of a tire low-speed containment characteristic test provided by an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram of a tire low-speed containment characteristic testing device provided by an embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification and claims and the following drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0043] In the embodiments of the present invention, the words "further", "exemplarily" or "optionally" are used to indicate examples, illustrations or descriptions, and should not be interpreted as being more preferred or more advantageous than other embodiments or designs. The use of the words "further", "exemplarily" or "optionally" is intended to present related concepts in a specific way.

[0044] In order to more conveniently describe the working principle of the embodiment of the present invention later, an introduction to relevant technical scenarios is first given below.

[0045] With the development of the automobile industry, people have put forward higher requirements for the ride comfort of automobiles. The tire is the only part of the vehicle that contacts the ground. It transmits and filters the impact of uneven roads on the vehicle. Therefore, the tolerance characteristics of the tire are crucial to improving the ride comfort of the vehicle. In the field of vehicle smooth dynamics simulation, the tire model currently used is based on the test data of the tire dynamically passing over the bump. The tolerance characteristics of the tire at low speed are indispensable for the modeling and simulation of vehicle smoothness. The existing test method for the low-speed tolerance characteristics of tires is mainly to use the tire clean test bench to install a fixed-size bump and set a fixed reference angle for the tire to conduct a low-speed tolerance characteristic test, so that the drum rotates at a low speed. When the tire and the drum are in contact at the set fixed reference angle, the test data are collected, and multiple tests are carried out. The average value is used as the basis for judging the low-speed tolerance characteristics of the tire. This method has low test efficiency because it requires multiple tests to obtain an average value. Although it can measure the fluctuation of tire force, it cannot quickly and accurately measure the fluctuation of tire force at each point on the tire surface and under different working conditions. The test results are too one-sided and cannot accurately and comprehensively reflect the low-speed tolerance characteristics of the tire. Using one-sided test results for vehicle smoothness modeling and simulation will result in incomplete modeling and simulation conditions and reduce modeling and simulation accuracy, affecting the judgment of the smoothness performance of the entire vehicle.

[0046] Based on this, the present invention provides a method for testing the low-speed tolerance characteristics of a tire. The testing method includes: installing the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to test the low-speed tolerance characteristics of the tire; performing internal stress elimination treatment on the tire on the test bench to obtain a treated tire; performing a force test on the treated tire on the test bench according to different bumps and preset test parameters, and obtaining the force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters; averaging the force values ​​to obtain an average force value; generating a tire force fluctuation value curve according to the average force value and a preset sampling time. The test method of the embodiment of the present invention selects bumps of different sizes and shapes each time, obtains the force values ​​of the tire and the drum at multiple different tire offset angles under different air pressures and loads, and averages the force values. A single test can obtain the average force value of the tire at multiple different tire offset angles, and generates a force fluctuation value curve of the tire according to the force average value and the preset sampling time, so as to more intuitively reflect the force fluctuation value of each point on the tire surface, which is used to quickly, accurately and comprehensively judge the low-speed tolerance characteristics of the tire, thereby overcoming the disadvantages and limitations of the existing test method that multiple tests are required to take the average value, and the average value can only reflect the force situation of one point on the tire surface. Therefore, the test method of the embodiment of the present invention can improve the test efficiency and accuracy. In addition, the embodiment of the present invention rotates the drum at forward and reverse speeds, and can measure the fluctuation of the tire force under different travel directions and different bump working conditions of the tire, more comprehensively reflect the low-speed tolerance characteristics of the tire, and improve the modeling and simulation accuracy. Based on this, the embodiment of the present invention can more comprehensively realize the test of the low-speed tolerance characteristics of the tire, and the test efficiency is high and the accuracy is high.

[0047] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0048] like Figure 1 As shown, Figure 1 It is a flowchart of a method for testing low-speed tolerance characteristics of a tire provided by an embodiment of the present invention. The method for testing low-speed tolerance characteristics of a tire may include but is not limited to steps S101 to S105.

[0049] Step S101, installing the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to perform a low-speed containment characteristic test on the tire;

[0050] Step S102, performing internal stress elimination treatment on the tire on a test bench to obtain a treated tire;

[0051] Step S103, performing a force test on the treated tire on a test bench according to different bumps and preset test parameters, and obtaining force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters;

[0052] Step S104, averaging the force values ​​to obtain an average force value;

[0053] Step S105 , generating a tire force fluctuation curve according to the average force value and a preset sampling time.

[0054] It is understandable that in step S101, the tire is mounted on a test bench, which may be a tire clean test bench. The test bench is provided with replaceable bumps, so that bumps of different sizes and shapes are used to test the low-speed containment characteristics of the tire each time. The bumps of different sizes and shapes include but are not limited to cube bumps, rectangular bumps and trapezoidal bumps, and the specific values ​​of the sizes can be set according to the test requirements. After the tire is mounted on the test bench, the tire pressure and other parameters can also be appropriately adjusted to ensure that the tire operating environment is normal.

[0055] It is understandable that in step S102, since the tire to be tested generally has residual stress inside, internal stress elimination treatment is required before testing. Specifically, a short pre-run test can be used to eliminate the residual stress. By setting the test run program to control the tire to run at a speed of 120km / h for 5 minutes under the rated load, a preheating test is performed to ensure uniform heat generation of the tire and eliminate the internal stress of the tire. It should be pointed out that since the tire will heat up after the pre-run, the accuracy of the subsequent measurement results will be affected, so the tire needs to be cooled for 5-10 minutes.

[0056] It is understandable that in step S103, the treated tire is subjected to a force test on the test bench according to different bumps and preset test parameters to obtain the force values ​​of the tire and the drum at multiple tire offset angles. During the test, bumps of different sizes and shapes are used for each test. When the tire offset angle changes, the fluctuations of the tire's various directional forces at different directions and speeds are collected through the test bench, wherein the tire's various directional forces include the tire's radial force, longitudinal force and lateral force. It should be noted that, compared with the longitudinal force and lateral force, the tire's radial force can better reflect the fluctuation of the tire, so as to be used to evaluate the low-speed containment characteristics of the tire.

[0057] It can be understood that the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters and reverse drum speed parameters.

[0058] It can be understood that the multiple load parameters are obtained by multiplying the nominal load by different coefficients, wherein the coefficients include but are not limited to 0.4, 0.8 and 1.2.

[0059] It is understandable that the air pressure parameters include but are not limited to 200 kPa, 250 kPa, and 300 kPa.

[0060] It can be understood that the forward drum speed parameter can be 1 km / h, and the reverse drum speed parameter can be -1 km / h.

[0061] It is understood that the plurality of tire offset angles may include 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°.

[0062] For example, under three different shapes and sizes of bumps (15*15, 25*10, 45*52*4), three sets of fixed loads (nominal loads multiplied by 0.4, 0.8 and 1.2 respectively), three sets of air pressures (200kPa, 250kPa, 300kPa), two sets of drum speeds (forward drum speed is 1km / h, reverse drum speed is -1km / h), and 18 combinations of three input parameters are used to test the low-speed containment characteristics of the tire. The tire offset angle variation range is set to 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

[0063] The test was carried out under the condition of forward drum rotation. Three different shapes and sizes of bumps were installed. The forward drum speed was set to 1km / h. The tire low-speed containment characteristic test was carried out at eight points with different tire offset angles, three different air pressures (200, 250, 300kPa) and three groups of different loads (0.4, 0.8, 1.2).

[0064] The test was carried out with the drum rotating in the reverse direction. Three different shaped and sized bumps were installed. The reverse drum speed was set to -1km / h. The tire was tested for its low-speed containment characteristics at eight points with different tire offset angles, three different air pressures (200, 250, 300kPa) and three different loads (0.4, 0.8, 1.2).

[0065] It can be understood that in step S104, when the drum rotates forward, the force fluctuations corresponding to eight points with different tire offset angles are averaged; when the drum rotates reversely, the force fluctuations corresponding to eight points with different tire offset angles are averaged again.

[0066] It can be understood that in step S105, a tire force fluctuation curve is generated based on the average force value and the preset sampling time. For example, the fluctuation value of the tire radial force is collected at a sampling frequency of 1000 Hz to generate a curve graph with time as the x-coordinate and the fluctuation value of the tire directional force as the y-coordinate.

[0067] The test method of the embodiment of the present invention selects bumps of different sizes and shapes each time, obtains the force values ​​of the tire and the drum at multiple different tire offset angles under different air pressures and loads, and averages the force values. A single test can obtain the average force value of the tire at multiple different tire offset angles, and generates a force fluctuation value curve of the tire according to the force average value and the preset sampling time, so as to more intuitively reflect the force fluctuation value of each point on the tire surface, which is used to quickly, accurately and comprehensively judge the low-speed tolerance characteristics of the tire, thereby overcoming the disadvantages and limitations of the existing test method that multiple tests are required to take the average value, and the average value can only reflect the force situation of one point on the tire surface. Therefore, the test method of the embodiment of the present invention can improve the test efficiency and accuracy. In addition, the embodiment of the present invention rotates the drum at forward and reverse speeds, and can measure the fluctuation of the tire force under different travel directions and different bump working conditions of the tire, more comprehensively reflect the low-speed tolerance characteristics of the tire, and improve the modeling and simulation accuracy. Based on this, the embodiment of the present invention can more comprehensively realize the test of the low-speed tolerance characteristics of the tire, and the test efficiency is high and the accuracy is high.

[0068] In one embodiment, before step S101, the tire low-speed tolerance characteristic testing method of the present invention further includes but is not limited to step S100.

[0069] Step S100, balancing the tire by using a dynamic balancing machine and a balancing block to obtain a tire with balanced mass distribution.

[0070] It is understandable that before the test, the tire is balanced using a dynamic balancing machine and balancing blocks to eliminate the mass imbalance of the tire under dynamic conditions, and then the tire with balanced mass distribution is installed on the test bench.

[0071] In one embodiment, if Figure 2 As shown, step S102 includes but is not limited to steps S201 to S203.

[0072] Step S201, setting the rated load, running speed and running time on the test bench;

[0073] Step S202, performing a preheating test on the tire according to the rated load, the running speed and the running time to obtain a preheated tire;

[0074] Step S203, cooling the preheated tire according to a preset time to obtain a treated tire.

[0075] Since the tire to be tested generally has residual stress inside, internal stress elimination treatment is required before testing. Specifically, a short pre-run test is used to eliminate the stress. The rated load, running speed and running time can be set on the test bench. The test bench performs a preheating test on the tire according to the rated load, running speed and running time to obtain the preheated tire, and then cools the preheated tire according to the preset time to obtain the cooled tire. For example, by setting a trial run program to control the tire to run at a speed of 120km / h for 5 minutes under the rated load for a preheating test, it is ensured that the tire is evenly heated and the internal stress of the tire is eliminated. Since the tire will heat up after the pre-run, the accuracy of the subsequent measurement results will be affected. Therefore, the tire needs to be cooled for 5-10 minutes to obtain a treated tire.

[0076] In one embodiment, if Figure 3 As shown, the tire low-speed tolerance characteristic testing method of the present invention also includes but is not limited to steps S301 to S302.

[0077] Step S301, performing Fourier transform processing on the force value to obtain a frequency spectrum, wherein the frequency spectrum is used to characterize the distribution of force amplitudes in different frequency ranges when the tire passes through a bump;

[0078] Step S302: constructing a tire smoothness model based on the frequency spectrum, where the tire smoothness model is used to identify the low-speed tolerance characteristics of the tire.

[0079] The embodiment of the present invention can further process the test data of the low-speed containment characteristic of the tire, for example, perform data analysis and processing on the fluctuation of the axial forces of the tire, perform Fourier transformation on the axial forces of the tire, obtain the distribution of the forces in the frequency range under different harmonics, and draw a frequency spectrum with the frequency as the horizontal axis and the amplitude of the axial forces as the vertical axis to explore the frequency distribution of the amplitude of the axial forces when the tire passes through the bump at a low speed. A tire smoothness model is constructed based on the frequency spectrum, and the tire smoothness model is used to identify the low-speed containment characteristic of the tire.

[0080] The following is a further explanation of the tire low-speed containment characteristic testing method of the present invention in conjunction with the accompanying drawings and specific embodiments.

[0081] 1. Preparation before the test: First, use a dynamic balancing machine and a balance block to eliminate the mass imbalance of the tire under dynamic conditions. Then install it on the test bench, adjust parameters such as tire pressure, and ensure that the tire operating environment is normal.

[0082] 2. Tire preheating test: The test tires are generally new tires, which still have residual stress inside. A short pre-run test is needed to eliminate it. The test program is set to control the tire to run at a speed of 120km / h for 5 minutes under rated load for preheating test to ensure uniform heat generation and eliminate internal stress of the tire. After the pre-run, the tire will heat up, which will affect the accuracy of subsequent measurement results, so the tire needs to be cooled for 5-10 minutes.

[0083] 3. New low-speed tolerance test of tires: This test mainly studies the fluctuation of tire radial force at different direction speeds when the tire offset distance changes under different bump sizes. Under three different shapes and sizes of bumps (15*15, 25*10, 45*52*4), three sets of fixed loads (nominal load multiplied by 0.4, 0.8 and 1.2), three sets of air pressures (200kPa, 250kPa, 300kPa), and two sets of drum speeds (-1km / h, 1km / h) are set. The low-speed tolerance characteristics of the tire are tested through eighteen combinations of three input parameters. The tire offset distance change range is set to 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°. The fluctuation value of the tire radial force is collected at a sampling frequency of 1000Hz, and a curve chart is generated with time as the x-coordinate and the fluctuation value of the tire radial force as the y-coordinate, as shown in the figure below. Figure 4 As shown, Figure 4 The radial force fluctuation value and time relationship curve diagram, it should be noted that the two peaks in the curve diagram are generated when the tire contacts the corner of the bump. Table 1 shows the test conditions of the low-speed containment characteristics of the tire in the present invention when the air pressure is 250 kPa and the fixed load is 1.2.

[0084] Table 1 Tire low-speed containment characteristics test conditions when air pressure is 250 kPa and fixed load is 1.2

[0085]

[0086] By analogy, the same applies to 200kPa, 300kPa, and load conditions of 0.4 and 0.8. The specific process is as follows: Figure 5 shown.

[0087] 4. Data processing of tire low-speed containment characteristic test: Data analysis and processing are performed on the fluctuation of the tire radial force. The tire radial force is subjected to Fourier transform to obtain the force distribution in the frequency range under different harmonics. A frequency spectrum is plotted with frequency as the horizontal axis and radial force amplitude as the vertical axis to explore the frequency distribution of radial force amplitude when the tire passes through a bump at low speed, which is used for subsequent tire smoothness model identification.

[0088] In order to illustrate the effect of the tire low-speed containment characteristic test of the present invention, the results of the current tire low-speed containment characteristic test and the tire low-speed containment characteristic test of the present invention are compared and analyzed below.

[0089] At present, the low-speed tolerance test of tires selects 15*15 bumps. After the tires are preheated for 5 minutes, three sets of fixed loads (nominal loads multiplied by 0.4, 0.8 and 1.2) and three sets of air pressures (200kPa, 250kPa, 300kPa) are set. The test is carried out at a speed of 1km / h through nine combinations of two input parameters. The test is repeated 5 times. The average value of the 5 tests is the reference value of the low-speed tolerance characteristics of the tire, as shown in Table 2 (taking 250kPa as an example).

[0090] Table 2 Current test conditions for low-speed containment characteristics of tires at an air pressure of 250 kPa

[0091]

[0092] The results of the low-speed tolerance test of the tire of the present invention and the low-speed tolerance test of the tire at the current stage are analyzed (as shown in Table 3 and Table 4, taking the air pressure as 250 kPa and the fixed load as 1.2 as an example):

[0093] Table 3 Test results of low-speed containment characteristics of tires at the current stage with air pressure of 250 kPa, fixed load of 1.2 and speed of 1

[0094]

[0095] Table 4 Test results of low-speed containment characteristics of tires of the present invention when the air pressure is 250 kPa, the fixed load is 1.2, and the speed is 1

[0096]

[0097] The first radial force fluctuation and the second radial force fluctuation in Table 3 and Table 4 are respectively measured when the tire contacts two different corners of the bump. It can be seen from the data in Table 3 and Table 4 that the results of the two methods differ by (1259.875-1179.8) / 1179.8=6.8%, which is quite different. Therefore, it is more accurate and comprehensive to use the radial force fluctuation value obtained by the test method of the present invention as the basis for judging the low-speed tolerance characteristics of the tire. The radial force fluctuation obtained by the current test method for low-speed tolerance characteristics of the tire is only the average value obtained through multiple tests, which can only represent one point on the tire surface. The test method for low-speed tolerance characteristics of the tire of the present invention only selects eight points that can represent the tire through a single test by setting the tire offset distance, and judges the low-speed tolerance characteristics of the tire through the average value of the eight points. In addition, the present invention can also obtain the low-speed tolerance characteristics of the tire in the opposite speed direction.

[0098] Based on this, compared with the current test method of measuring a single point multiple times and taking an average, the test method of the present invention has at least the following advantages:

[0099] Beneficial effects:

[0100] 1. The tire low-speed tolerance characteristic test method proposed in the present invention sets different tire position offset distances, compares the force fluctuation value and time relationship curve obtained at each point on the tire surface with the test result value averaged from multiple single-point measurements at the current stage, and obtains a more comprehensive and accurate tire low-speed tolerance characteristic test method.

[0101] 2. The tire low-speed tolerance characteristics testing method proposed in the present invention can accurately and comprehensively measure the tire low-speed tolerance characteristics through only a single test, thereby improving test efficiency.

[0102] 3. The tire low-speed containment characteristic testing method proposed in the present invention uses three different sized bumps, namely trapezoidal, rectangular and cube, and sets the speeds in different directions. The measured test data can enhance the reliability of modeling and simulation.

[0103] In addition, if Figure 6 As shown, one embodiment of the present invention further discloses a tire low-speed containment characteristic testing device, the device comprising:

[0104] An installation module 110 is used to install the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to perform a low-speed containment characteristic test on the tire;

[0105] The processing module 120 is used to perform internal stress elimination processing on the tire on the test bench to obtain a processed tire;

[0106] The testing module 130 is used to perform a force test on the treated tire on the test bench according to different bumps and preset test parameters, and obtain the force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters;

[0107] A calculation module 140 is used to average the force values ​​to obtain an average force value;

[0108] The generating module 150 is used to generate a tire force fluctuation value curve according to the force average value and a preset sampling time.

[0109] The tire low-speed tolerance characteristics testing device of the embodiment of the present invention is used to execute the tire low-speed tolerance characteristics testing method in the above embodiment. Its specific processing process is the same as the tire low-speed tolerance characteristics testing method in the above embodiment, and will not be repeated here.

[0110] In addition, if Figure 7As shown, an embodiment of the present invention further discloses an electronic device, comprising: at least one processor 210; at least one memory 220, for storing at least one program; when the at least one program is executed by the at least one processor 210, a tire low-speed tolerance characteristic testing method as in any of the previous embodiments is implemented.

[0111] In addition, an embodiment of the present invention further discloses a computer-readable storage medium, in which computer-executable instructions are stored. The computer-executable instructions are used to execute the tire low-speed containment characteristic testing method as in any of the previous embodiments.

[0112] The system architecture and application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art will appreciate that with the evolution of the system architecture and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0113] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0114] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0115] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process or an execution thread, and a component may be located on a computer or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may communicate, for example, through local or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through signals).

Claims

1. A method for testing the low-speed tolerance characteristics of a tire, characterized in that: include: Mounting the tire on a test bench, wherein the test bench is provided with replaceable bumps, and the bumps are used to perform a low-speed containment characteristic test on the tire; Performing internal stress elimination treatment on the tire on the test bench to obtain the treated tire; According to the different protrusions and preset test parameters, the treated tire is subjected to a force test on the test bench to obtain force values ​​of the tire and the drum at multiple tire offset angles, wherein the test parameters include multiple load parameters, multiple air pressure parameters, forward drum speed parameters, and reverse drum speed parameters; averaging the force values ​​to obtain a force average value; A force fluctuation value curve of the tire is generated according to the force average value and a preset sampling time.

2. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: Before mounting the tire on the test bench, the method further comprises: The tire is balanced by a dynamic balancing machine and a balancing block to obtain a tire with balanced mass distribution.

3. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The step of performing internal stress elimination treatment on the tire on the test bench to obtain the treated tire comprises: setting a rated load, operating speed and operating duration on the test bench; Performing a preheating test on the tire according to the rated load, the running speed and the running time to obtain the preheated tire; The preheated tire is cooled according to a preset time to obtain the treated tire.

4. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The method further comprises: Performing Fourier transform processing on the force value to obtain a frequency spectrum, wherein the frequency spectrum is used to characterize the distribution of force amplitudes in different frequency ranges when the tire passes through the bump; A tire smoothness model is constructed based on the frequency spectrum, and the tire smoothness model is used to identify the low-speed containment characteristics of the tire.

5. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The different protrusions include cube protrusions, rectangular parallelepiped protrusions and trapezoidal protrusions.

6. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The multiple load parameters are obtained by multiplying the nominal load by different coefficients.

7. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The air pressure parameters include 200kPa, 250kPa, and 300kPa.

8. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The forward drum speed parameter is 1 km / h, and the reverse drum speed parameter is -1 km / h.

9. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The plurality of tire offset angles include 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°.

10. The method for testing the low-speed tolerance characteristics of a tire according to claim 1, characterized in that: The stress value includes at least one of a radial force value, a longitudinal force value and a lateral force value.

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