CN115219246A - Method and device for measuring lateral relaxation length of tire - Google Patents
Method and device for measuring lateral relaxation length of tire Download PDFInfo
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- CN115219246A CN115219246A CN202210363001.7A CN202210363001A CN115219246A CN 115219246 A CN115219246 A CN 115219246A CN 202210363001 A CN202210363001 A CN 202210363001A CN 115219246 A CN115219246 A CN 115219246A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012546 transfer Methods 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000004044 response Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/06—Steering behaviour; Rolling behaviour
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Abstract
The invention discloses a method and a device for measuring the axial relaxation length of a tire, wherein the method comprises the following steps: s1, mounting a tire to be measured on a six-component force test bench, and enabling the tire to run on the six-component force test bench at a preset load and a preset speed; s2, after the running of the tire is stable, performing sinusoidal input on the tire at a preset amplitude, changing the frequency of the sinusoidal input for multiple times, and acquiring a yaw angle and a lateral force of the tire during running; s3, calculating a transfer function of the lateral force and the yaw angle; s4, fitting a curve of the transfer function; and S5, calculating the lateral relaxation length of the tire according to the curve of the transfer function. According to the method for measuring the lateral relaxation length of the tire, the lateral relaxation length of the tire under the influence of the tire deflection can be effectively calculated, the problem that the calculation result is inaccurate due to the influence of the deflection angle coupling in the traditional method is solved, and the measurement accuracy of the lateral relaxation length of the tire is improved.
Description
Technical Field
The invention relates to the technical field of vehicle manufacturing, in particular to a method and a device for measuring the lateral relaxation length of a tire.
Background
The lateral relaxation length of the tire is an important index for measuring the transient lateral mechanical response of the tire, and has important influence on the transient steering characteristic of the whole vehicle. The test standard of response is not established at home and abroad about the lateral relaxation length characteristic of the tire, the evaluation of the response delay of the steering in the chassis adjustment of the whole vehicle is an important evaluation index, and the complete and accurate test of the lateral relaxation characteristic of the tire is essential to the test and simulation of the steering performance of the whole vehicle.
At present, three methods for testing the lateral relaxation length of a tire in the industry are available: a rigidity ratio method, a slip angle step method and a slip angle sine sweep frequency method.
1. And a rigidity ratio method, namely measuring the transverse rigidity and the cornering stiffness of the tire, and calculating the ratio of the transverse rigidity and the cornering stiffness as the lateral relaxation length. This method has a large problem both in trend and in accuracy because it assumes that the lateral stiffness of the tire is the same in both dynamic and static states.
2. And (3) a slip angle step method, namely recording a curve of the lateral force of the tire along with the change of the rolling distance after the slip angle of the tire is stepped from 0 to 1 degree through simulation, and taking the rolling distance when the lateral force reaches 0.632 time of a steady state value as the lateral relaxation length. The test method has two realization means, wherein the first realization means is that the tire rotates by a slip angle of 1 degree when being at rest, then is loaded on a stationary test bed, and the speed is increased from 0 to the designated speed after being stabilized. The drawback of this method is that the velocity loading rate of the tire is very unstable, resulting in inaccurate rolling distance in the test data, thereby affecting the accuracy of the lateral slack length calculation. The second means is that the tire runs stably at a specified speed, and then the slip angle is changed from 0 to 1 degree at the maximum angular speed, the speed data obtained by the method is stable, but the data coupling before the slip angle is stable cannot be eliminated in the calculation process, so that the calculated lateral relaxation length value is larger than the actual result.
3. The main idea of the testing method is to calculate the lateral relaxation length by testing the time phase difference between the lateral force and the lateral deflection angle of the tire under the working condition of sinusoidal input of the lateral deflection angle of the tire in uniform-speed running. In the testing method, the sine change of the slip angle of the tire can generate the lateral force input with the cosine change of the slip angle, so that the calculation result is inaccurate. The first two types are widely applied because of the convenience of test data processing, and the side slip angle sine frequency sweeping method is difficult in data processing and less in application.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method for measuring the lateral loose length of the tire, which can effectively calculate the lateral loose length of the tire under the influence of the deflection of the tire and improve the measurement accuracy of the lateral loose length of the tire.
The invention also provides a device for measuring the axial relaxation length of the tire.
The method for measuring a lateral slack length of a tire according to the first aspect of the present invention includes the steps of: s1, mounting a tire to be measured on a six-component force test bench, and enabling the tire to run on the six-component force test bench at a preset load and a preset speed; s2, after the running of the tire is stable, performing sinusoidal input on the tire at a preset amplitude, changing the frequency of the sinusoidal input for multiple times, and acquiring a yaw angle and a lateral force of the tire during running; s3, calculating a transfer function of the lateral force and the yaw angle; s4, fitting a curve of the transfer function; and S5, calculating the lateral relaxation length of the tire according to the curve of the transfer function.
According to the method for measuring the lateral relaxation length of the tire, the influence part of the deflection angle is eliminated by directly deducing the transfer function of the lateral force and the yaw angle, an accurate test result is obtained, the lateral relaxation length of the tire under the influence of the deflection of the tire is effectively calculated, the problem that the calculation result is inaccurate due to the coupling influence of the deflection angle in the traditional method is solved, and the measurement accuracy of the lateral relaxation length of the tire is improved.
In some embodiments, said fitting a curve of said transfer function comprises: fitting a curve of the transfer function by a predetermined formula, the predetermined formula being:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is a laplace variable, σ is a distance from a cornering start point to a tire grounding point, and a is a tire grounding half-length.
In some embodiments, in said step S5, the lateral relaxation length σ of said tyre y Satisfies the following conditions: sigma y ＝σ+a。
In some embodiments, the predetermined magnitude is 1-3 °.
In some embodiments, said varying the frequency of said sinusoidal input a plurality of times comprises: the frequency of the sinusoidal input is gradually increased from 0.1Hz to 5Hz.
In some embodiments, in the step S1, the preset load is 200kg-1000kg, and the preset speed is 5km/h-40km/h.
According to a second aspect of the present invention, there is provided a tire lateral slack length measuring apparatus, comprising: a six component force test rig for mounting a tire; an application module for applying a load to the tire; the driving module is used for driving the tire to rotate; a sine input module for performing sine input on the tire; an acquisition module for acquiring a yaw angle and a lateral force of the tire; a processing module for calculating a transfer function of the lateral force and the yaw angle of the tire; a fitting module for fitting a curve of the transfer function; a calculation module, the calculation for calculating a lateral slack length of the tire.
In some embodiments, the fitting module fits the curve of the transfer function according to a predetermined formula, the predetermined formula being:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is the laplace variable, σ is the distance from the starting point of cornering to the point of contact of the tire, and a is the half-length of contact of the tire.
In some embodiments, the lateral relaxation length σ of the tire y Satisfies the following conditions: sigma y ＝σ+a。
In some embodiments, the preset amplitude is 1-3 °, and the sinusoidal input module is configured to gradually increase the frequency of the sinusoidal input from 0.1Hz to 5Hz.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method of measuring lateral slack length of a tire according to an embodiment of the present invention;
FIG. 2 is an image of a transfer function of lateral force and yaw angle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the amplitude and frequency of a sinusoidal input in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of another set of amplitudes and frequencies of a sinusoidal input in accordance with an embodiment of the present invention;
FIG. 5 is a fitted image of a transfer function according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method of measuring a lateral slack length of a tire according to an embodiment of the present invention is described below with reference to fig. 1 to 5.
As shown in fig. 1, a method for measuring a lateral relaxation length of a tire according to an embodiment of the present invention includes the steps of:
s1, mounting a tire to be measured on a six-component force test bench, and enabling the tire to run on the six-component force test bench at a preset load and a preset speed;
s2, after the running of the tire is stable, performing sinusoidal input on the tire at a preset amplitude, changing the frequency of the sinusoidal input for multiple times, and acquiring a yaw angle and a lateral force of the tire during running;
s3, calculating a transfer function of the lateral force and the yaw angle;
s4, fitting a curve of the transfer function;
and S5, calculating the lateral relaxation length of the tire according to the curve of the transfer function.
Namely, a tire to be measured is firstly installed on a six-component test bench, the tire runs on the six-component test bench at a preset load and a preset speed, then after the tire runs stably, the tire is subjected to sine input at a preset amplitude value, the frequency of the sine input is changed for multiple times, the yaw angle and the lateral force of the tire during running are obtained, then the transfer functions of the lateral force and the yaw angle are calculated, then the curve of the transfer functions is fitted, and finally the lateral relaxation length of the tire is calculated according to the curve of the transfer functions. Therefore, the problem that the calculation result is inaccurate due to the influence of the deflection angle coupling in the traditional method is solved.
According to the method for measuring the lateral relaxation length of the tire, disclosed by the embodiment of the invention, the influence part of the deflection angle is eliminated by directly deducing the transfer function of the lateral force and the yaw angle, an accurate test result is obtained, the lateral relaxation length of the tire under the influence of the deflection of the tire is effectively calculated, the problem that the calculation result is inaccurate due to the coupling influence of the deflection angle in the traditional method is avoided, and the measurement accuracy of the lateral relaxation length of the tire is improved.
It should be noted here that the transfer function curve of the lateral force and the slip angle is calculated by the laplace transform, because the slip angle read on the six-component gantry is actually the yaw angle of the tire, and the slip angle is actually the yaw angle to which the influence of the yaw angle is coupled.
Further, fitting a curve of the transfer function includes: fitting the curve of the transfer function by a predetermined formula, the predetermined formula being:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is a laplace variable, σ is a distance from a cornering start point to a tire grounding point, and a is a tire grounding half-length.
It will be appreciated that the laplace variable, may be replaced by the path frequency, w, which is the ratio of the angular frequency at which the tire is cornering by a sine wave to the longitudinal movement of the tire at speed,
where v is the tire rolling speed, f α For the yaw angle scanning frequency, i is a complex number, i 2 ＝-1。
Further, in step S5, the lateral relaxation length σ of the tire y Satisfies the following conditions: sigma y ＝σ+a。
Further, the preset amplitude is 1-3 degrees.
Preferably, the preset amplitude is 2 °.
Further, varying the frequency of the sinusoidal input a plurality of times includes: the frequency of the sinusoidal input was gradually increased from 0.1Hz to 5Hz. Therefore, the condition of the response of the tire under different loads and frequencies can be more completely reflected by the distribution of the loads and the frequencies as much as possible.
Further, in step S1, the preset load is 200kg-1000kg, and the preset speed is 5km/h-40km/h. The preset load is set according to actual needs, and the preset speed is preferably 20km/h.
Refer to FIG. 2, wherein F y Tire lateral force;
C Fα tire cornering stiffness;
a yaw angle psi;
a, half-length of tire grounding;
λ path wavelength (λ =) 1 / w )；
φ Fψ The phase lag angle of the lateral force with the yaw angle.
According to a second aspect of the present invention, there is provided a tire lateral slack length measuring apparatus, comprising: the device comprises a six-component force testing rack, a loading module, a driving module, a sine input module, an acquisition module, a processing module, a fitting module and a calculation module.
Specifically, the six-component testing bench is used for mounting a tire, the loading module is used for applying a load to the tire, the driving module is used for driving the tire to rotate, the sine input module is used for performing sine input on the tire, the acquisition module is used for acquiring the yaw angle and the lateral force of the tire, the processing module is used for calculating the lateral force and the transfer function of the yaw angle of the tire, and the fitting module is used for fitting the curve of the transfer function and calculating the lateral relaxation length of the tire. Therefore, the measuring device is simple in structure and convenient to use.
According to the device for measuring the lateral relaxation length of the tire, disclosed by the embodiment of the invention, the influence part of the deflection angle is eliminated by directly deducing the transfer function of the lateral force and the yaw angle, an accurate test result is obtained, the lateral relaxation length of the tire under the influence of the deflection of the tire is effectively calculated, the problem that the calculation result is inaccurate due to the coupling influence of the deflection angle in the traditional method is avoided, and the measurement accuracy of the lateral relaxation length of the tire is improved.
Further, the fitting module fits a curve of the transfer function according to a preset formula, wherein the preset formula is as follows:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is the laplace variable, σ is the distance from the starting point of cornering to the point of contact of the tire, and a is the half-length of contact of the tire.
It will be appreciated that the p-placian variable, may be replaced by the path frequency w, which is the ratio of the angular frequency at which the tire is cornering by a sine wave to the longitudinal movement of the tire at speed,
where v is the tire rolling speed, f α For the yaw angle scanning frequency, i is a complex number, i 2 ＝-1。
Further, the lateral relaxation length σ of the tire y Satisfies the following conditions: sigma y ＝σ+a。
Further, the preset amplitude is 1-3 degrees, and the sine input module is used for gradually increasing the frequency of the sine input from 0.1Hz to 5Hz. Therefore, the distribution of the load and the frequency as much as possible can more completely show the response condition of the tire under different loads and frequencies.
Preferably, the preset amplitude is 2 °.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method of measuring a tire lateral slack length, the method comprising the steps of:
s1, mounting a tire to be measured on a six-component force test bench, and enabling the tire to run on the six-component force test bench at a preset load and a preset speed;
s2, after the running of the tire is stable, performing sinusoidal input on the tire at a preset amplitude, changing the frequency of the sinusoidal input for multiple times, and acquiring a yaw angle and a lateral force of the tire during running;
s3, calculating a transfer function of the lateral force and the yaw angle;
s4, fitting a curve of the transfer function;
and S5, calculating the lateral relaxation length of the tire according to the curve of the transfer function.
2. The method of measuring lateral slack length of a tire as in claim 1, wherein said fitting a curve of said transfer function comprises: fitting a curve of the transfer function by a predetermined formula, the predetermined formula being:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is the laplace variable, σ is the distance from the starting point of cornering to the point of contact of the tire, and a is the half-length of contact of the tire.
3. Method for measuring the lateral slack length of a tyre as claimed in claim 1, characterized in that in said step S5 the lateral slack length σ of the tyre is measured y Satisfies the following conditions: sigma y ＝σ+a。
4. Method for measuring the lateral slack length of a tyre as claimed in claim 1, characterized in that said predetermined amplitude is comprised between 1 ° and 3 °.
5. The method of measuring lateral slack length of a tire as in claim 1, wherein said varying the frequency of the sinusoidal input a plurality of times comprises: the frequency of the sinusoidal input is gradually increased from 0.1Hz to 5Hz.
6. The method for measuring the lateral relaxation length of the tire as claimed in claim 1, wherein in the step S1, the preset load is 200kg to 1000kg, and the preset speed is 5km/h to 40km/h.
7. A tire lateral slack length measuring device, comprising:
a six component force test rig for mounting a tire;
an application module for applying a load to the tire;
the driving module is used for driving the tire to rotate;
a sinusoidal input module for inputting a sine to the tire;
an acquisition module for acquiring a yaw angle and a lateral force of the tire;
a processing module for calculating a transfer function of the lateral force and the yaw angle of the tire;
a fitting module for fitting a curve of the transfer function;
a calculation module for calculating a lateral slack length of the tire.
8. The apparatus for measuring the lateral slack length of a tire as in claim 7, wherein said fitting module fits the curve of said transfer function according to a predetermined formula, said predetermined formula being:
wherein Cc is the lateral stiffness per unit length of the tire belt; p is the laplace variable, σ is the distance from the starting point of cornering to the point of contact of the tire, and a is the half-length of contact of the tire.
9. Device for measuring the lateral relaxation length of a tyre as claimed in claim 7, characterized in that said lateral relaxation length σ of the tyre is such that y Satisfies the following conditions: sigma y ＝σ+a。
10. The apparatus for measuring the lateral slack length of a tire as in claim 7, wherein the predetermined amplitude is 1 ° -3 °, and the sinusoidal input module is configured to gradually increase the frequency of the sinusoidal input from 0.1Hz to 5Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210363001.7A CN115219246A (en) | 2022-04-06 | 2022-04-06 | Method and device for measuring lateral relaxation length of tire |
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| CN202210363001.7A CN115219246A (en) | 2022-04-06 | 2022-04-06 | Method and device for measuring lateral relaxation length of tire |
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| US20140136056A1 (en) * | 2012-11-13 | 2014-05-15 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Vehicle steering apparatus, method and non-transitory computer readable medium |
| CN104458287A (en) * | 2014-12-23 | 2015-03-25 | 吉林大学 | Tire lateral relaxation length measurement method |
| CN109556891A (en) * | 2019-01-18 | 2019-04-02 | 吉林大学 | A kind of lateral relaxed length measurement method of tire |
| CN109612748A (en) * | 2019-01-18 | 2019-04-12 | 吉林大学 | A kind of tire longitudinal relaxation length measurement method |
| 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 |
| CN112414728A (en) * | 2020-09-27 | 2021-02-26 | 吉林大学 | Method for measuring lateral relaxation length of tire |
| CN112590470A (en) * | 2020-12-25 | 2021-04-02 | 山东玲珑轮胎股份有限公司 | Tire dynamics testing method and device |
-
2022
- 2022-04-06 CN CN202210363001.7A patent/CN115219246A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140136056A1 (en) * | 2012-11-13 | 2014-05-15 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Vehicle steering apparatus, method and non-transitory computer readable medium |
| CN104458287A (en) * | 2014-12-23 | 2015-03-25 | 吉林大学 | Tire lateral relaxation length measurement method |
| CN109556891A (en) * | 2019-01-18 | 2019-04-02 | 吉林大学 | A kind of lateral relaxed length measurement method of tire |
| CN109612748A (en) * | 2019-01-18 | 2019-04-12 | 吉林大学 | A kind of tire longitudinal relaxation length measurement method |
| 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 |
| CN112414728A (en) * | 2020-09-27 | 2021-02-26 | 吉林大学 | Method for measuring lateral relaxation length of tire |
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