CN113553658B - Tire longitudinal slip characteristic measurement and data processing method, apparatus and computer readable carrier medium - Google Patents
Tire longitudinal slip characteristic measurement and data processing method, apparatus and computer readable carrier medium Download PDFInfo
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- CN113553658B CN113553658B CN202110669262.7A CN202110669262A CN113553658B CN 113553658 B CN113553658 B CN 113553658B CN 202110669262 A CN202110669262 A CN 202110669262A CN 113553658 B CN113553658 B CN 113553658B
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- 238000001816 cooling Methods 0.000 abstract description 4
- 238000005192 partition Methods 0.000 abstract description 3
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention belongs to the fields of automobile tire side deviation longitudinal sliding composite sliding mechanical property test and dynamic modeling, and particularly relates to a tire longitudinal sliding property measurement and data processing method, equipment and a computer readable carrier medium. The invention divides the measuring range of the longitudinal slip rate into a linear region, a nonlinear region under the small slip condition and a nonlinear region under the large slip condition. By means of independent measurement of the linear region, the influence caused by abrasion and frictional heating of the tire tread is eliminated; and the nonlinear area is measured, the slip rate can be adjusted through the loading rate, and meanwhile, the static cooling mode can be matched, so that the test temperature rise of the tire can be controlled in a reasonable range. The influence of frictional heat on the longitudinal sliding characteristic linear region is eliminated based on the longitudinal sliding characteristic data measured in the partition measurement mode, meanwhile, the real tire working state can be accurately reflected in the nonlinear region, and the quality of the longitudinal modeling test data of the stable tire model can be improved.
Description
Technical Field
The invention belongs to the fields of automobile tire side deviation longitudinal sliding composite sliding mechanical property test and dynamic modeling, and particularly relates to a tire longitudinal sliding property measurement and data processing method, equipment and a computer readable carrier medium.
Background
Vehicle dynamics simulation technology has become an important means of automobile development, ranging from performance target design before mule vehicle manufacture to whole vehicle performance adjustment before pre-test production, and dynamics simulation application almost runs through various stages of automobile development. The tire model is an essential input of vehicle dynamics simulation, and the high-precision tire model can truly express physical tire performance, and common tire models comprise a PAC2002 tire model, an FTire tire model and a CDTire tire model. The tire model suitable for the whole vehicle operation stability simulation is PAC2002 (also called a magic formula tire model). The PAC2002 tire model is a purely empirical tire model, the model relies on a large amount of test data to identify model parameters, and the model itself does not have the expression capability of tire wear or temperature.
At present, a common practice of a longitudinal slip characteristic modeling test for a PAC2002 tire model is that under a fixed roll angle and load, the slip rate is gradually loaded from a zero point (or a value near the zero point) position to a maximum value, then gradually loaded to a minimum value, and finally returned to the zero point. In the above order, additional loads are performed until all tests are completed. The disadvantage of this method is that the tire wear and temperature rise effect caused by large longitudinal slippage and large load of the tire directly affects the whole slippage rate range. It has been investigated that even in summer, the tire surface temperature of a car during subjective evaluation or objective testing at a test site is about 35 ℃ -50 ℃ (no special testing is included, nor is a tread formulation designed for a special purpose included). Therefore, the current tire longitudinal sliding characteristic modeling test method has a certain difference with the actual running state of the tire, which is one of reasons for the difference between the whole vehicle simulation result and the actual measurement result.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for measuring the composite slip characteristic of a tire in a partitioning way, which accurately measures the longitudinal slip characteristic data of the tire under the combination conditions of different loads and different roll angles and has the characteristics of rapidness, good repeatability and high accuracy.
In order to achieve the above object, the present invention adopts the following technical scheme
A method of zonally measuring tire longitudinal slip characteristics, the method comprising the steps of:
1) Mounting a test tire on a proper tire six-component force testing machine, and firstly setting the tire air pressure, the road surface speed, the camber angle and the vertical load required by the test;
2) The sliding rate is applied in a zoning mode, the sliding rate loading adopts a sine wave or triangular wave mode, and test data of the longitudinal force of the tire relative to the sliding rate under the combination conditions of required vertical load and/or camber angle and the like are measured through a time sampling mode.
Preferably, the step 1) includes the steps of:
1) Extracting tires which are produced in the same batch and have smaller sample differences as test tires;
2) Mounting a test tire on a proper rim, inflating and adjusting to the required air pressure, and then standing in a laboratory environment with temperature control for more than or equal to 3 hours to balance the temperature inside and outside the tire and prepare for preloading in the inflated state of the tire;
3) Mounting the inflated and parked tire on a six-component force testing machine with a lateral deviation testing function, setting the required tire pressure, road surface speed, camber angle and vertical load, and carrying out a pre-experiment on the tire to ensure that the tire reaches a preset temperature balance and eliminate the residual stress in the tire;
4) After the pre-experiment was completed, the tire air pressure was readjusted to the air pressure value required for the experiment.
Preferably, the step 2) includes 1 or 2 or 3 of the longitudinal slip characteristic test of the linear region, the longitudinal slip characteristic test of the nonlinear region under the condition of small slip rate and the longitudinal slip characteristic test of the nonlinear region under the condition of large slip rate; the sliding rate of the linear region is within the range of +/-3 degrees, the sliding rate under the condition of small sliding rate is within the range of +/-3 percent to +/-15 percent, and the sliding rate under the condition of large sliding rate is within the range of +/-15 percent to +/-30 percent.
Preferably, the longitudinal sliding characteristic test of the linear region comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Performing a longitudinal sliding characteristic test of the linear region;
5) And (3) cycling the steps from the step 2) to the step 4) until all the side inclination angle and vertical load test conditions are completed.
Preferably, the longitudinal slip characteristic test of the nonlinear region under the condition of small slip rate comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Executing a longitudinal slip characteristic test of a nonlinear region under a small slip rate condition;
5) According to the requirement of test temperature rise control, setting the free rolling of the tire to cool to a target value;
6) And (3) cycling the steps from the step 2) to the step 5) until all the side inclination angle and vertical load test conditions are completed.
Preferably, the longitudinal slip characteristic test of the nonlinear region under the condition of the large slip rate comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Executing a longitudinal slip characteristic test of a nonlinear region under a large slip rate condition;
5) According to the requirement of test temperature rise control, setting the free rolling of the tire to cool to a target value;
6) And (3) cycling the steps from the step 2) to the step 5) until all the side inclination angle and vertical load test conditions are completed.
The invention further discloses a tire longitudinal slip characteristic test data processing method, which comprises the following steps:
1) The original test data measured by the method according to the technical proposal are read to a data processing device, and the data comprise the data of the channels such as the slip rate, the longitudinal force, the vertical load and the like;
2) The data processing device is adopted to splice and filter the test data in different intervals;
3) Performing interpolation processing on the filtering processing result data by adopting a data processing device, so that scattered point test data of the forward and return strokes are processed into continuous curves;
4) Symmetrically taking the two data of the forward stroke and the return stroke up and down, so that a curve of folding effect is generated by the longitudinal force about the forward stroke curve and the return stroke curve of the slip rate;
5) Generating tdx data files meeting PAC2002 model identification by adopting a data processing device;
6) And (3) identifying the tire model to obtain a tire model tir file which is used for providing the tire model tir file for the whole vehicle to carry out dynamic simulation analysis.
Preferably, the going-out is a section of the slip rate from negative to positive, namely a characteristic curve of the longitudinal force corresponding to-30% relative to the slip rate; the return stroke is the section of the slip rate from positive to negative, namely, the characteristic curve of the longitudinal force corresponding to 30% -30% relative to the slip rate.
The invention further discloses a data processing device, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps of the data processing method when being executed by the processor.
Further, the invention also discloses a non-transitory computer readable carrier medium storing program instructions, the computer readable storage medium storing a computer program thereon, the computer program when executed by a processor implementing the steps of the method for implementing the data processing method.
By adopting the technical scheme, the longitudinal slip rate measuring range is divided into a linear region, a nonlinear region under the small slip condition and a nonlinear region under the large slip condition. By means of independent measurement of the linear region, the influence caused by abrasion and frictional heating of the tire tread is eliminated; and the nonlinear area is measured, the slip rate can be adjusted through the loading rate, and meanwhile, the static cooling mode can be matched, so that the test temperature rise of the tire can be controlled in a reasonable range. The influence of frictional heat on the longitudinal sliding characteristic linear region is eliminated based on the longitudinal sliding characteristic data measured in the partition measurement mode, meanwhile, the real tire working state can be accurately reflected in the nonlinear region, and the quality of the longitudinal modeling test data of the stable tire model can be improved.
The beneficial effects of the invention are that
(1) The method has the advantages of high accuracy and good repeatability of the measurement result, and can ensure the measurement accuracy of the linear region (eliminate the influence of tread friction heat generation on the linear region of the longitudinal sliding characteristic of the tire).
(2) The partition measuring method can effectively solve the problem that the longitudinal sliding test cannot be executed due to the fact that the vertical load of the equipment is too large (the method can ensure the normal test of the tire under the conditions of linear area and small sliding).
(3) The data processing method has high efficiency and good data processing quality.
Drawings
FIG. 1 is a flow chart of a tire longitudinal slip characteristic test.
Fig. 2 is a tire longitudinal slip characteristic data processing device.
Fig. 3 is a graph showing an example of the result of processing tire longitudinal slip characteristic data.
Detailed Description
The following is a specific example procedure for the zonal measurement of longitudinal slip characteristics for a 205/60R16 semi-steel radial tire using the present invention.
1. 1 piece of semisteel radial tire with 205/60R16 specification is extracted as a test tire;
2. mounting the test tire on a 6J x 16 rim and adjusting the inflation to the air pressure of 250kPa, and standing in a laboratory (room temperature is controlled at 24+ -3 ℃) environment for 3 hours to reach the temperature balance of the inside and outside of the tire, and preparing for the pre-loading in the inflated state of the tire;
3. the inflated and parked test tire was mounted on a MTS flat-trac CT model tester with the required tire pressure set at 250kPa, road speed set at 60kph, vertical load set at 5000N, camber angle set at zero degrees, slip ratio set at 0%, and run for 10 minutes. Then the slip rate is set as dynamic loading, and the tire is pre-tested by the steps of 0% -10% -0% (the slip rate loading rate is set as 10 DEG/s) and the rest conditions are unchanged and the tire is circulated for 6 cycles;
4. after the pre-experiment is finished, the tire air pressure is readjusted to a test target value, namely 250kPa;
5. the longitudinal sliding characteristic test of the linear region was conducted as follows:
5.1 setting the road surface speed required by the test to be 60kph;
5.2 setting the first vertical load value required for the test to be 2550N;
5.3 setting the first roll angle required for the test to 0 °;
5.4 performing a longitudinal slip characteristic test in a linear region (slip ratio in the range of + -3%);
5.5, circulating the steps from the 5.2 to the 5.4 until other two groups of vertical loads (5100N and 7650N) and roll angle (5 degrees and minus 5 degrees) working conditions are completed;
6. the longitudinal slip characteristic test of the nonlinear region of the small slip ratio range was conducted as follows:
6.1 setting the road surface speed required by the test to be 60kph;
6.2 setting the first vertical load value required for the test to be 2550N;
6.3 setting the first roll angle required for the test to 0 °;
6.4, executing a longitudinal sliding characteristic test of a linear region (the sliding rate is within the range of +/-3% - +/-15%);
6.5, setting a tire free rolling program, cooling and monitoring the tread temperature of the tire to 50 ℃;
6.6, circulating the steps from the 6.2 to the 6.5 until the other two groups of vertical loads (5100N and 7650N) and the working conditions of the roll angle (5 degrees and minus 5 degrees) are completed;
7. the longitudinal slip characteristic test of the nonlinear region of the large slip angle range was conducted as follows:
7.1 setting the road surface speed required by the test to be 60kph;
7.2 setting the first vertical load value required for the test to 2550N;
7.3 setting the first roll angle required for the test to 0 °;
7.4, executing a longitudinal sliding characteristic test of a linear region (the sliding rate is within the range of +/-15% - +/-30%);
7.5, setting a tire free rolling program, cooling and monitoring the tread temperature of the tire to 50 ℃;
7.5 cycle steps 7.2 to 7.5 until the other two other sets of vertical loads (5100N, 7650N) and roll angle (5 DEG, -5 DEG) conditions are completed.
The data processing device is used for processing the measured tire longitudinal slip characteristic test data, and the specific process is as follows:
1. reading original test data in an excel format measured by a test to a data processing device, wherein the data comprise data of channels such as slip rate, longitudinal force, vertical load and the like;
2. the data processing device is adopted to splice and filter the test data in different intervals;
3. interpolation processing is carried out on the filtering processing result data by adopting a data processing device, so that scattered point test data of a forward stroke (a section with the slip rate from minus to plus, namely, a characteristic curve of the longitudinal force corresponding to minus 30% -30% with respect to the slip rate) and a return stroke (a section with the slip rate from plus to minus, namely, a characteristic curve of the longitudinal force corresponding to minus 30% -30%) are processed into continuous curves;
4. the two data of the forward stroke and the return stroke are symmetrically fetched up and down, so that a curve with folding effect is generated by the longitudinal force on the two curves of the forward stroke and the return stroke of the slip rate (the curve can be encrypted or sparse according to actual needs);
5. generating tdx data files meeting PAC2002 model identification by adopting a data processing device;
6. and (3) identifying the tire model to obtain a tire model tir file, and providing the tire model tir file for the whole vehicle to carry out dynamic simulation analysis.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A method of zonally measuring tire longitudinal slip characteristics, the method comprising the steps of:
1) Mounting a test tire on a proper tire six-component force testing machine, and firstly setting the tire air pressure, the road surface speed, the camber angle and the vertical load required by the test;
2) The method comprises the steps of applying the slip rate in a zoning mode, loading the slip rate in a sine wave or triangular wave mode, and measuring test data of the longitudinal force of the tire under the combination condition of the required vertical load and/or the camber angle by a time sampling mode;
said step 1) comprises the steps of:
1) Extracting tires which are produced in the same batch and have smaller sample differences as test tires;
2) Mounting a test tire on a proper rim, inflating and adjusting to the required air pressure, and then standing in a laboratory environment with temperature control for more than or equal to 3 hours to balance the temperature inside and outside the tire and prepare for preloading in the inflated state of the tire;
3) Mounting the inflated and parked tire on a six-component force testing machine with a lateral deviation testing function, setting required tire air pressure, road surface speed, vertical load, camber angle and slip ratio, and performing a pre-experiment on the tire to ensure that the tire reaches preset temperature balance and eliminate residual stress in the tire;
4) After the pre-experiment is finished, the tire air pressure is readjusted to the air pressure value required by the experiment;
step 2) comprises a lateral deviation and longitudinal sliding composite sliding characteristic test of a linear region, a lateral deviation and longitudinal sliding composite sliding characteristic test of a nonlinear region under a small sliding rate condition, and 1 kind, 2 kinds or 3 kinds of lateral deviation and longitudinal sliding composite sliding characteristic tests of the nonlinear region under a large sliding rate condition; the sliding rate of the linear region is within a range of +/-3 degrees, the sliding rate under the condition of small sliding rate is within a range of +/-3 percent to +/-15 percent, and the sliding rate under the condition of large sliding rate is within a range of +/-15 percent to +/-30 percent;
the test of the lateral deviation longitudinal sliding composite sliding characteristic of the linear region comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Performing a longitudinal sliding characteristic test of the linear region;
5) Cycling the step 2) to the step 4) until all the side inclination angles and vertical load test conditions are completed;
the lateral deviation longitudinal sliding composite sliding characteristic test of the nonlinear region under the condition of small sliding rate comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Executing a longitudinal slip characteristic test of a nonlinear region under a small slip rate condition;
5) According to the requirement of test temperature rise control, setting the free rolling of the tire to cool to a target value;
6) Cycling the step 2) to the step 5) until all the side inclination angles and vertical load test conditions are completed;
the lateral deviation longitudinal sliding composite sliding characteristic test of the nonlinear region under the condition of the large sliding rate comprises the following steps:
1) Setting the road surface speed required by the test;
2) Setting a first vertical load value required by a test;
3) Setting a first roll angle required by the test;
4) Executing a longitudinal slip characteristic test of a nonlinear region under a large slip rate condition;
5) According to the requirement of test temperature rise control, setting the free rolling of the tire to cool to a target value;
6) And (3) cycling the steps from the step 2) to the step 5) until all the side inclination angle and vertical load test conditions are completed.
2. A tire side deviation longitudinal sliding composite slip characteristic test data processing method comprises the following steps:
1) The method of claim 1, wherein the raw test data measured by the method is read to a data processing device, and the data comprises data of slip rate, longitudinal force and vertical load;
2) The data processing device is adopted to splice and filter the test data in different intervals;
3) Performing interpolation processing on the filtering processing result data by adopting a data processing device, so that scattered point test data of the forward and return strokes are processed into continuous curves;
4) Symmetrically taking the two data of the forward stroke and the return stroke up and down, so that a curve of folding effect is generated by the longitudinal force about the forward stroke curve and the return stroke curve of the slip rate;
5) Generating tdx data files meeting PAC2002 model identification by adopting a data processing device;
6) And (3) identifying the tire model to obtain a tire model tir file which is used for providing the tire model tir file for the whole vehicle to carry out dynamic simulation analysis.
3. The data processing method according to claim 2, wherein the going-out is a section of the slip ratio from negative to positive, that is, a characteristic curve of a longitudinal force corresponding to-30% with respect to the slip ratio; the return stroke is the section of the slip rate from positive to negative, namely, the characteristic curve of the longitudinal force corresponding to 30% -30% relative to the slip rate.
4. A data processing apparatus comprising a processor, a memory and a computer program stored on the memory and executable on the processor, characterized in that the computer program when executed by the processor implements the steps of the method of claim 2 or 3.
5. A non-transitory computer readable carrier medium storing program instructions, characterized in that the computer readable carrier medium stores thereon a computer program which, when executed by a processor, implements the steps of the method of claim 2 or 3.
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| CN202110669262.7A CN113553658B (en) | 2021-06-17 | 2021-06-17 | Tire longitudinal slip characteristic measurement and data processing method, apparatus and computer readable carrier medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110669262.7A CN113553658B (en) | 2021-06-17 | 2021-06-17 | Tire longitudinal slip characteristic measurement and data processing method, apparatus and computer readable carrier medium |
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| CN113553658B true CN113553658B (en) | 2024-03-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236929A (en) * | 2014-06-18 | 2014-12-24 | 吉林大学 | Longitudinal sliding test method for eliminating longitudinal force deviation of tire |
| CN109668745A (en) * | 2018-11-05 | 2019-04-23 | 江苏大学 | A kind of piecewise affine identification modeling method of the vertical sliding mechanical characteristic of tire |
| CN111504663A (en) * | 2020-04-28 | 2020-08-07 | 吉林大学 | Method for measuring longitudinal and smooth relaxation length of tire based on transfer function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2544299B (en) * | 2015-11-11 | 2020-11-11 | Jaguar Land Rover Ltd | Improvements in or relating to tyre testing procedures |
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- 2021-06-17 CN CN202110669262.7A patent/CN113553658B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236929A (en) * | 2014-06-18 | 2014-12-24 | 吉林大学 | Longitudinal sliding test method for eliminating longitudinal force deviation of tire |
| CN109668745A (en) * | 2018-11-05 | 2019-04-23 | 江苏大学 | A kind of piecewise affine identification modeling method of the vertical sliding mechanical characteristic of tire |
| CN111504663A (en) * | 2020-04-28 | 2020-08-07 | 吉林大学 | Method for measuring longitudinal and smooth relaxation length of tire based on transfer function |
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| CN113553658A (en) | 2021-10-26 |
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