CN113532718B - Identification method and equipment for stability of tire six-component detection system - Google Patents
Identification method and equipment for stability of tire six-component detection system Download PDFInfo
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- CN113532718B CN113532718B CN202110599312.9A CN202110599312A CN113532718B CN 113532718 B CN113532718 B CN 113532718B CN 202110599312 A CN202110599312 A CN 202110599312A CN 113532718 B CN113532718 B CN 113532718B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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Abstract
The invention belongs to the field of tires, and relates to a method and equipment for identifying the stability of a six-component testing machine for an automobile tire. The method comprises the following steps: 1) Selecting a sufficient number of tires with good individual consistency as control tires, and dividing the control tires into 2 groups; 2) Selecting A group of tires, and sequentially selecting 1 tire in a fixed period to carry out state detection on the six-component testing machine under the test conditions of higher speed, higher load and smaller slip angle; 3) Calculating the stability coefficients of lateral deflection rigidity and return rigidity by using an automatic template device, and identifying the state of the six-component force testing machine; 4) And B group of tires, sequentially selecting 1 tire in a fixed period, and monitoring the abrasive paper abrasion state at a lower speed, a lower load and a larger slip angle: and calculating the stability coefficient of the lateral force adhesion coefficient by using an automatic template device, and identifying the abrasive paper abrasion state.
Description
Technical Field
The invention belongs to the field of tires, and relates to a method and equipment for identifying the stability of a six-component testing machine for an automobile tire.
Background
The six-component testing machine for the automobile tire is used for simulating and measuring tire force and moment generated in the contact process of the tire and a road surface, is mainly used for tire benchmarking analysis and tire dynamics modeling, and has an important role in the research of automobile safety, smoothness and operation stability. The stability of the six-component testing machine mainly comprises two aspects of equipment sensor stability and test road surface stability. The accuracy and stability of the equipment sensor can be calibrated by periodical calibration, but the calibration time and the cost are higher, so the calibration interval time is longer usually, and the equipment sensor is not suitable for daily equipment state monitoring. In order to simulate the driving of a car on a test field or a road, sand paper with certain roughness is adhered to a test road surface. With the continuous use of the testing machine, the sand paper is in a dynamic abrasion process, so that the state stability of the six-component system cannot be effectively identified only by means of 1~2 years/times of system calibration.
Due to different development requirements, the test tire specifications and the test conditions are widely distributed, so that the use frequency of the test sand paper in different areas is different, as shown in the attached drawing 1. Statistically, the wear states are distributed in a step from the center to two sides, and the area with 225mm in the center of the sand paper is the most frequently used area. At present, a method for monitoring six-component force by using 10 smooth tires in GBT 397702 is generally adopted, but the method does not distinguish the state of a six-component force testing machine from the state of test sand paper, and once one control tire fails, all the control tires need to be replaced, so that the testing efficiency is influenced.
Therefore, a monitoring method of a six-component force detection system, which is fast, effective and capable of independently replacing a failed tire, is needed to be developed by selecting a proper control tire, so that the drift of a six-component force testing machine and the abrasion state of test abrasive paper can be accurately identified.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for identifying the stability of a six-component detection system of a tire, which adopts a smooth surface control tire to respectively carry out tests in a linear region and a non-linear region of the tire lateral deviation characteristic so as to judge the data drift of six-component equipment, test sand paper failure and control tire failure, and further develops an automatic data processing template.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for identifying the stability of a six-component tire force detection system comprises the following steps:
1) Selecting a sufficient number of tyres with good individual consistency as control tyres, and dividing the control tyres into a group A and a group B;
2) Selecting A group of tires, and sequentially selecting 1 tire in a fixed period to carry out state detection on the six-component testing machine under the test conditions of higher speed, higher load and smaller slip angle;
3) Calculating the stability coefficients of the lateral deviation rigidity and the aligning rigidity by using an automatic template device, and identifying the state of the six-component force testing machine;
4) And B group of tires, sequentially selecting 1 tire in a fixed period, and monitoring the abrasive paper abrasion state at a lower speed, a lower load and a larger slip angle:
and calculating the stability coefficient of the lateral force adhesion coefficient by using an automatic template device, and identifying the abrasive paper abrasion state.
Preferably, the step 2) comprises the following steps:
2.1 Selected control tires, fitted with appropriate tires, and left standing in a laboratory environment for at least 3 hours;
2.2 Adjusting tire inflation pressure to a specified air pressure, setting camber angle to zero, setting a higher speed and a higher load;
2.3 Respectively acquiring the slip angles of one circle after the tire runs for two circles under the conditions of 0 degree, 0.5 degrees, 1 degree and 1 degreeSALateral forceF y Vertical forceF z Sum and return torqueM z And (4) data.
Preferably, the step 3) comprises the following steps:
3.1 Calculating lateral force and aligning moment correction values, F y-corr And M z-corr
Wherein: actual test load F z-test Command input test load F z-cmd ；
3.2 Calculating the slope of the linear fitting of the lateral force to the lateral deflection angle after correction as the lateral deflection rigidity CP of the tire and the slope of the linear fitting of the aligning moment to the lateral deflection angle after correction as the aligning rigidity ATP of the tire;
3.3 Calculate the on-day lateral stiffness CP n And current day alignment of rigid ATP n Comparing the stability factor epsilon in the tire historical data CP And ε ATP See the formula for details:
wherein: CP (CP) i 、CP j The lateral deflection rigidity on the ith and jth days respectively; ATP i 、ATP j The righting rigidity of the day i and the day j respectively, and n is the number of days;
3.4 If the stability factor ε CP And ε ATP If the data do not exceed 2.5, the state of the equipment sensor can be judged to be stable, otherwise, the data exceed the standard and retesting is required after human factors are eliminated; if the data do not exceed the standard, judging that the state of the sensor is stable, otherwise, carrying out sensor state detection tests of other tires; if the data still exceed the standard, judging that the control tire fails on the same day and needing to be replaced; otherwise, the equipment is judged to drift, and the equipment needs to be calibrated in time.
Preferably, the step 4) comprises the following steps:
4.1 Selected control tires, fitted with appropriate tires, and left standing in a laboratory environment for at least 3 hours;
4.2 Adjusting tire inflation pressure to a specified air pressure, setting camber angle to zero degrees, setting lower speed and lower load;
4.3 Respectively collecting the sideslip angle SA and the sideslip force F of one turn after two turns of tire operation under the condition that the sideslip angle is 0 DEG, -1 DEG, -2 DEG, -4 DEG, -8 DEG and 8 DEG y Vertical force F z And (4) data.
Preferably, the step 5) comprises the following steps:
5.1 Calculate the coefficient of lateral force adhesion μ, μ = F at each yaw angle y /F z ；F y /F z Refers to the ratio of lateral force to vertical force;
5.2 Calculate the stability factor ε _ μ of the lateral force adhesion coefficient at each yaw angle, see equation (5)
Wherein: mu.s i 、μ j 、μ n The lateral force adhesion coefficients of the ith day, the jth day and the nth day are respectively;
5.3 Sandpaper state determination: if the coefficient of stability ε μ If the data does not exceed 2.5, the state of the abrasive paper can be judged to be stable, otherwise, the data exceeds the standard and needs to be tested again after human factors are eliminated; if the data do not exceed the standard, judging that the abrasive paper state is stable, otherwise, carrying out abrasive paper state detection tests of other tires; if the data do not exceed the standard, the control tire is judged to be invalid on the same day and needs to be replaced; otherwise, the abrasive paper is judged to be abnormal in abrasion state, and the abrasive paper needs to be replaced in time.
Furthermore, the invention also discloses equipment for identifying the stability of the tire six-component detection system, which comprises a data acquisition module and a data analysis module, wherein the data acquisition module adopts the data in the steps 2) and 4); and the data analysis module acquires the data and carries out calculation and judgment according to the methods in the steps 3) and 5).
Further, the present invention also discloses an electronic device, which includes a processor, a memory, and a computer program stored on the memory and operable on the processor, wherein the computer program, when executed by the processor, implements the following steps:
acquiring data acquired in the step 2) and the step 4);
calculating and judging according to the methods of the step 3) and the step 5), respectively.
Further, the present invention also discloses a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of:
acquiring data acquired in the step 2) and the step 4);
calculating and judging according to the methods of the step 3) and the step 5), respectively.
The invention also discloses an automatic processing template which is an excel file with a macro command, and opens a file pop-up window, so that test information reading, original data storage, data processing and equipment state judgment can be automatically realized, wherein the stability coefficient value is the maximum stability coefficient in the latest data of each tire.
The invention has the advantages of
(1) The detection method is reliable, simple in procedure and high in test efficiency;
(2) The method can effectively identify the accuracy of the test data of the six-component testing machine, particularly the drift phenomenon;
(3) The invention can effectively identify and judge the abrasion state of the test sand paper.
Drawings
Fig. 1 is a schematic diagram of a six-component test sandpaper wear area.
Fig. 2 is a flow chart of monitoring the state of the six-component equipment.
Fig. 3 is a schematic diagram of a state monitoring window of a six-component device.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments.
Selecting 5 smooth tires with 225/60R16 specifications and good consistency as control tires, respectively numbering the control tires as A1, A2, A3, B1 and B2, installing test rims meeting the standard specification, and parking the control tires for at least 3 hours in a laboratory environment, wherein the parking pressure is 270kPa +/-1 kPa.
A tire with the serial number of A start is selected in sequence every day to execute a six-component sensor state monitoring test, and the specific test steps are as follows:
1. mounting the parked tire to a six-component force testing machine, and adjusting the testing air pressure to 250kPa +/-1 kPa;
2. setting the camber angle to be 0 degrees, the test load to be 6000N and the test speed to be 80km/h;
3. respectively collecting the slip angles of one circle after the tire runs for two circles under the conditions that the slip angles are 0 degree, 0.5 degree, -1 degree and 1 degreeSALateral forceF y Vertical forceF z Sum and return torqueM z Data;
4. opening an automatic template file, popping up a window shown in figure 3, and checking detection information;
5. clicking the 'equipment state identification' button in the form, the automatic data processing comprises the following calculations:
(a) Correcting the lateral force and the aligning moment by adopting formulas (1) and (2);
(b) Calculating the slope of the linear fit of the corrected lateral force to the cornering angle, i.e. the cornering stiffness of the tyre: (CP) And the slope of the linear fit of the corrected aligning moment to the side slip angle, i.e. the aligning stiffness of the tire: (ATP）；
(c) Respectively calculating the cornering stiffness of the control tire on the same day by adopting the formulas (3) and (4) ((
) And aligning rigidity: (
) Comparing the stability coefficient in the tire historical data;
(d) And respectively taking the larger value of the stability coefficients of the cornering stiffness and the aligning stiffness of the A1, A2 and A3 tires to judge whether the control tire is failed or the equipment sensor drifts.
Selecting a tire with the number B beginning in sequence every three days to execute a sand paper abrasion state monitoring test, wherein the specific test steps are as follows:
1. mounting the parked tire to a six-component force testing machine, and adjusting the testing air pressure to 250kPa +/-1 kPa;
2. setting the camber angle to be 0 degrees, the test load to be 3000N, and the test speed to be 10km/h;
3. respectively collecting the side drift angles of one circle after two circles of tire operation under the conditions that the side drift angles are 0 degrees, 1 degrees, -2 degrees, 4 degrees, -8 degrees and 8 degreesSALateral forceF y Vertical forceF z ；
4. Opening an automatic template file, popping up a window shown in figure 3, and checking detection information;
5. clicking the 'equipment state identification' button in the form, the automatic data processing comprises the following calculations:
(a) Calculating the lateral force adhesion coefficient under each lateral deviation angleμ，
(b) Calculating the stability coefficient of the lateral force adhesion coefficient mu under each lateral deflection angle by adopting a formula (5)
(c) And respectively taking the maximum value of the lateral adhesion coefficient of each side of the B1 and B2 tires to judge the failure of the control tire or the abnormal abrasion state of the test abrasive paper.
After 8 weeks of monitoring by the method, the stability coefficients of the relevant parameters of A1, A2, A3, B1 and B2 are summarized in a table 1-3, wherein the tire A1 shows that the state of the testing machine is stable and the data of the tire B1 is abnormal on the day, the data still exceeds the standard after the tire B2 is used, and the abrasion abnormality of test abrasive paper is judged and the abrasive paper needs to be replaced.
TABLE 1 stability coefficient of state detection test of six-component force testing machine
TABLE 2 B1 tyre-six component force abrasive paper wear monitoring test stability coefficient
TABLE 3 B2 tyre-six component force abrasive paper wear monitoring test stability coefficient
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, and is provided in the accompanying drawings. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in 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 (6)
1. A method for identifying the stability of a six-component tire force detection system is characterized by comprising the following steps of:
1) Selecting 5 tires with good individual consistency as control tires, and dividing the control tires into a group A and a group B;
2) Selecting A group of tires, and sequentially selecting 1 tire in a fixed period to carry out state detection on the six-component testing machine under the test conditions of higher speed, higher load and smaller slip angle;
2.1 Selected control tires, fitted with appropriate tires, and left standing in a laboratory environment for at least 3 hours;
2.2 Adjusting tire inflation pressure to a specified air pressure, setting camber angle to zero, setting a higher speed and a higher load;
2.3 Respectively acquiring the slip angles of one circle after the tire runs for two circles under the conditions of 0 degree, 0.5 degrees, 1 degree and 1 degreeSALateral forceF y Vertical forceF z Sum and return torqueM z Data;
3) Calculating the stability coefficients of lateral deflection rigidity and return rigidity by using an automatic template device, and identifying the state of the six-component force testing machine;
the automated template device calculation comprises the following steps:
3.1 Calculating lateral force and aligning moment correction values, F y-corr And M z-corr
Wherein: actual test load F z-test Command input test load F z-cmd ；
3.2 Calculating the slope of the linear fitting of the lateral force to the lateral deflection angle after correction as the lateral deflection rigidity CP of the tire and the slope of the linear fitting of the aligning moment to the lateral deflection angle after correction as the aligning rigidity ATP of the tire;
3.3 Calculate the current-day yaw stiffness CP n And current day alignment of rigid ATP n Comparing the stability factor epsilon in the tire historical data CP And ε ATP See the formula for details:
wherein: CP (CP) i 、CP j The lateral deflection rigidity on the ith and jth days respectively; ATP i 、ATP j The righting rigidity of the day i and the day j respectively, and n is the number of days;
3.4 If the stability factor ε CP And ε ATP If the data do not exceed 2.5, the state of the equipment sensor can be judged to be stable, otherwise, the data exceed the standard and retesting is required after human factors are eliminated; if the data do not exceed the standard, judging that the state of the sensor is stable, otherwise, carrying out sensor state detection tests of other tires; when the tire condition detection test of other tires is carried out, if the data still exceed the standard, the control tire is judged to be invalid on the same day and needs to be replaced; otherwise, judging that the equipment drifts, and needing to calibrate the equipment in time;
4) 1 tire of the group B is selected in sequence at a fixed period, and the abrasive paper wear state is monitored at a lower speed, a lower load and a larger side deflection angle;
5) And calculating the stability coefficient of the lateral force adhesion coefficient by using an automatic template device, and identifying the abrasive paper abrasion state.
2. The method for identifying the stability of the six-component tire force detection system according to claim 1, wherein the step 4) comprises the following steps:
4.1 Selected control tires, fitted with appropriate tires, and left standing in a laboratory environment for at least 3 hours;
4.2 Adjusting tire inflation pressure to a specified air pressure, setting camber angle to zero degrees, setting lower speed and lower load;
4.3 Respectively collects the slip angle SA and the lateral force F of one circle after two circles of tire running under the conditions of 0 degree, -1 degree, -2 degree, -4 degree, -8 degree and 8 degree of the slip angle y Vertical force F z And (4) data.
3. The method for identifying the stability of the six component tire force detecting system according to claim 1, wherein the step 5) comprises the following steps:
5.1 Calculate the coefficient of lateral force adhesion μ, μ = F at each yaw angle y /F z ；F y /F z Refers to the ratio of lateral force to vertical force;
5.2 Computing a stability factor ε of the lateral force adhesion coefficient at each slip angle μ In detail, see formula (5)
Wherein: mu.s i 、μ j 、μ n The lateral force adhesion coefficients of the ith day, the jth day and the nth day are respectively;
5.3 Sandpaper state determination: if the coefficient of stability ε μ If the data does not exceed 2.5, the state of the abrasive paper can be judged to be stable, otherwise, the data exceeds the standard and needs to be tested again after human factors are eliminated; if the data do not exceed the standard, judging that the abrasive paper state is stable, otherwise, carrying out abrasive paper state detection tests of other tires; when the sand paper state detection tests of other tires are carried out, if the data do not exceed the standard, the control tire is judged to be invalid on the same day and needs to be replaced; otherwise, the abrasive paper is judged to be abnormal in abrasion state, and the abrasive paper needs to be replaced in time.
4. An identification device for the stability of a six-component tire force detection system, which is characterized by comprising a data acquisition module and a data analysis module, wherein the data acquisition module adopts the data in the step 2) and the step 4) of any one of claims 1 to 3; and the data analysis module acquires the data and carries out calculation and judgment according to the methods of the step 3) and the step 5).
5. An electronic device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of:
A. obtaining data collected in step 2) and step 4) of any one of claims 1-3;
B. the calculation and the determination are performed according to the methods of step 3) and step 5), respectively.
6. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, performs the steps of:
A. obtaining data collected in step 2) and step 4) of any one of claims 1-3;
B. the calculation and the determination are performed according to the methods of step 3) and step 5), respectively.
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