CN109612748A - A kind of tire longitudinal relaxation length measurement method - Google Patents
A kind of tire longitudinal relaxation length measurement method Download PDFInfo
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- CN109612748A CN109612748A CN201910046487.XA CN201910046487A CN109612748A CN 109612748 A CN109612748 A CN 109612748A CN 201910046487 A CN201910046487 A CN 201910046487A CN 109612748 A CN109612748 A CN 109612748A
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- straight skidding
- skidding rate
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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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Abstract
A kind of tire longitudinal relaxation length measurement method, this method is mounted on tire on flat rubber belting formula tire Time series analysis, it adjusts side drift angle and angle of heel is zero, adjust flat rubber belting formula tire Time series analysis, tire is set to reach desired vertical load, testing stand is rolled with constant speed band driving wheel tire, apply and drives braking moment, control tire straight skidding rate, so that straight skidding rate changes according to the period of setting, the triangular wave of amplitude, the test data in multiple periods is obtained, parameter identification is carried out and obtains tire longitudinal relaxation length.Operation of the present invention is simple, alleviates test work load；Different road surface speed can be studied to the affecting laws of longitudinal relaxation length；Different straight skidding rate loading speeds can be studied to the affecting laws of longitudinal relaxation length.
Description
Technical field
The invention belongs to tire mechanical property testing fields, and in particular to a kind of tire longitudinal relaxation length measurement method,
The load rolling test of straight skidding rate triangular wave is carried out on flat rubber belting formula tire Time series analysis by tire, obtaining abundance has
The tire longitudinal relaxation length under certain rolling speed, certain straight skidding rate loading speed is calculated in the test data of effect,
Test method is easy to operate, and workload is small, and test accuracy is high.
Background technique
Tire is the unique parts that vehicle is contacted with road surface, and the interaction force between tire and road surface is vehicle movement
The mechanical characteristic of basic reason, tire has very important influence to vehicle dynamic property, manipulation stability, ride comfort etc..Wheel
Tire mechanical property testing is the basis for establishing tire model, passes through the kinematic parameter of the available tire of mechanics of tire characteristic test
With the six square phase relationship on road surface.
Tire is characterized applied to a description is all introduced in the tire longitudinal direction unsteady Model of vehicle longitudinal direction dynamic simulation
The physical quantity of transient response-longitudinal relaxation length, the longitudinal relaxation length of tire are a passes in tire Longitudinal Dynamical Characteristics
Key index, size determines the response speed speed of tire six square phase, therefore accurate measurement longitudinal relaxation length is to establish height
The key of precision tire longitudinal direction model.
Currently, the test method of tire longitudinal relaxation length is main are as follows: from the available vertical of longitudinal relaxation length concept
It is equal to the ratio of tire vertical sliding rigidity and longitudinal tire stiffness to relaxed length.The vertical sliding rigidity of tire can be slided from tire stable state is vertical
It is obtained in test, it may be assumed that longitudinal force slope of a curve when straight skidding rate is zero；Longitudinal tire stiffness can be by stationary state
Under tire apply length travel test obtain, it may be assumed that the ratio of longitudinal force of tire and length travel.What this method obtained is wheel
Tire longitudinal relaxation length approximation, because of longitudinal rigidity under longitudinal rigidity and rolling condition under tire stationary state and endless
It is exactly the same；And two kinds of Tire testing testing stands, experimentation cost are needed to tire longitudinal relaxation measurement of length by this method
It is relatively high；This method cannot obtain longitudinal direction corresponding to different tire rolling speeds, different straight skidding rate loading speeds
Relaxed length.
In conclusion to obtain the accurate longitudinal relaxation under characterization friction speed, different straight skidding rate loading speeds
Length value needs a kind of test method of tire longitudinal relaxation length for facilitating implementation and can guarantee precision.
Summary of the invention
In order to overcome above-mentioned technical deficiency, the present invention provides a kind of tire longitudinal relaxation length measurement method, so that
Test simple and reliable, measuring accuracy is more accurate.
A kind of tire longitudinal relaxation length measurement method, this method is:
Tire is mounted on flat rubber belting formula tire Time series analysis, side drift angle is adjusted and angle of heel is zero, adjust flat rubber belting
Formula tire Time series analysis, makes tire reach desired vertical load, and testing stand is rolled with constant speed band driving wheel tire, applied
Add drive braking moment, control tire straight skidding rate, so that straight skidding rate becomes according to the period of setting, the triangular wave of amplitude
Change, obtain the test data in multiple periods, carries out parameter identification and obtain tire longitudinal relaxation length.Specifically includes the following steps:
One, test tire is installed on flat rubber belting formula tire Time series analysis, adjusts flat rubber belting formula tire six-compoent thrust test
Platform angle of heel control mechanism makes the angle of heel of tire be zero, adjusts flat rubber belting formula tire Time series analysis side drift angle control mechanism
So that the side drift angle of tire is zero；Adjust flat rubber belting formula tire Time series analysis tire pressure control mechanism make tire pressure to specify
Value；
Two, the Vertical loading structure for adjusting flat rubber belting formula tire Time series analysis, is pressed in tire on flat rubber belting road surface, tire
Vertical load reaches the load of test requirements document, and vertical load during test is kept to stablize；
Three, it carries out tire preheating to roll, reaches the Tire testing temperature of test requirements document, adjustment tire pressure is the tire of test requirements document
Pressure；Because tire internal temperature increases after tire preheating rolls, due to the thermal expansion and cold contraction effect of gas, can tire pressure be increased,
So needing to readjust tire pressure after preheat；
Four, flat rubber belting formula tire Time series analysis driving/braking system is controlled, the loading speed of tire straight skidding rate is set
With load amplitude so that tire straight skidding rate according to setting triangular wave load, straight skidding rate according to setting triangular wave
Loading method, the test data in three periods of repeated acquisition, the test data include at least longitudinal force of tire, straight skidding
Rate, straight skidding rate loading speed and vertical load；
Five, according to expression formulaIt can be in the hope of formula parameters value, to ask by test result curve
Obtain longitudinal relaxation length lx, wherein Fx0Corresponding longitudinal force, V when for straight skidding rate being 0rFor simulated roadway movement speed,
KxDerivative when being equal to 0 for longitudinal force straight skidding rate about straight skidding rate,Longitudinal direction when for straight skidding rate equal to zero
Slip rate loading speed.
Beneficial effects of the present invention:
1. measurement method of the invention is easy to operate, test work load is alleviated.
2. the present invention can study different road surface speed to the affecting laws of longitudinal relaxation length.
3. the present invention can study different straight skidding rate loading speeds to the affecting laws of longitudinal relaxation length.
Detailed description of the invention
Fig. 1 is the illustraton of model that the present invention measures.
Fig. 2 is actual tests curve synoptic diagram.Because using quasi-steady state test method, therefore in SxF is corresponding with at=0x01With
Fx02Two power take F when calculatingx0=Fx01-Fx02。
Specific embodiment
A kind of tire longitudinal relaxation length measurement method, this method is:
Tire is mounted on flat rubber belting formula tire Time series analysis, side drift angle is adjusted and angle of heel is zero, adjust flat rubber belting
Formula tire Time series analysis, makes tire reach desired vertical load, and testing stand is rolled with constant speed band driving wheel tire, applied
Add drive braking moment, control tire straight skidding rate, so that straight skidding rate becomes according to the period of setting, the triangular wave of amplitude
Change, obtain the test data in multiple periods, carries out parameter identification and obtain tire longitudinal relaxation length, specifically includes the following steps:
One, test tire is installed on flat rubber belting formula tire Time series analysis, adjusts flat rubber belting formula tire six-compoent thrust test
Platform angle of heel control mechanism makes the angle of heel of tire be zero, adjusts flat rubber belting formula tire Time series analysis side drift angle control mechanism
So that the side drift angle of tire is zero；Adjust flat rubber belting formula tire Time series analysis tire pressure control mechanism make tire pressure to specify
Value；
Two, the Vertical loading structure for adjusting flat rubber belting formula tire Time series analysis, is pressed in tire on flat rubber belting road surface, tire
Vertical load reaches the load of test requirements document, and vertical load during test is kept to stablize；
Three, it carries out tire preheating to roll, reaches the Tire testing temperature of test requirements document, adjustment tire pressure is the tire of test requirements document
Pressure；Because tire internal temperature increases after tire preheating rolls, due to the thermal expansion and cold contraction effect of gas, can tire pressure be increased,
So needing to readjust tire pressure after preheat；
Four, flat rubber belting formula tire Time series analysis driving/braking system is controlled, the loading speed of tire straight skidding rate is set
With load amplitude so that tire straight skidding rate according to setting triangular wave load, straight skidding rate according to setting triangular wave
Loading method, the test data in three periods of repeated acquisition, the test data include at least longitudinal force of tire, straight skidding
Rate, straight skidding rate loading speed and vertical load；
Five, according to expression formulaIt can be in the hope of formula parameters value, to ask by test result curve
Obtain longitudinal relaxation length lx, wherein Fx0Corresponding longitudinal force, V when for straight skidding rate being 0rFor simulated roadway movement speed,
KxDerivative when being equal to 0 for longitudinal force straight skidding rate about straight skidding rate,Longitudinal direction when for straight skidding rate equal to zero
Slip rate loading speed.
As depicted in figs. 1 and 2, longitudinal relaxation length formulaShow that mode is as follows:
U: carcass deflection
Carcass deformation velocity
Fx: longitudinal force
K: carcass longitudinal rigidity
C: tyre surface damping
Vsx: tire longitudinal slip velocity
A point stress is analyzed, is had:
To Fx=-Ku derivation,
Have
Then
In tire model, have
According to damping force=damped coefficient * speed, tire tread damped coefficient is obtained
Wherein SxFor tire straight skidding rate, KxFor the vertical sliding rigidity of tire, VxFor tire longitudinal velocity, VrFor simulated roadway
Movement speed.
It brings formula (3) into formula (1), has
It brings formula (5) into formula (7), has
It is defined, is had according to longitudinal relaxation length
It brings formula (9) into formula (8), has
Work as SxWhen=0, have
Wherein: Fx0For SxLongitudinal force when=0,For SxLongitudinal force when=0 is to the derivative of straight skidding rate by formula
(11), have
Wherein:For tire straight skidding rate to the derivative of time at zero point, loaded also referred to as at straight skidding rate zero point
Rate.
Claims (2)
1. a kind of tire longitudinal relaxation length measurement method, it is characterised in that:
Tire is mounted on flat rubber belting formula tire Time series analysis, side drift angle is adjusted and angle of heel is zero, adjust flat rubber belting formula wheel
Tire Time series analysis makes tire reach desired vertical load, and testing stand is rolled with constant speed band driving wheel tire, applies and drives
Braking moment controls tire straight skidding rate, so that straight skidding rate changes according to the period of setting, the triangular wave of amplitude, obtains
To the test data in multiple periods, carries out parameter identification and obtain tire longitudinal relaxation length.
2. a kind of tire longitudinal relaxation length measurement method, it is characterised in that: the following steps are included:
One, test tire is installed on flat rubber belting formula tire Time series analysis, adjusts flat rubber belting formula tire Time series analysis side
Pitch angle control mechanism makes the angle of heel of tire be zero, and adjustment flat rubber belting formula tire Time series analysis side drift angle control mechanism makes
The side drift angle of tire is zero；Adjusting flat rubber belting formula tire Time series analysis tire pressure control mechanism makes tire pressure to designated value；
Two, the Vertical loading structure for adjusting flat rubber belting formula tire Time series analysis, is pressed in tire on flat rubber belting road surface, tire is vertical
Load reaches the load of test requirements document, and vertical load during test is kept to stablize；
Three, it carries out tire preheating to roll, reaches the Tire testing temperature of test requirements document, adjustment tire pressure is the tire pressure of test requirements document；
Because tire internal temperature increases after tire preheating rolls, due to the thermal expansion and cold contraction effect of gas, can tire pressure be increased, institute
To need to readjust tire pressure after preheat；
Four, flat rubber belting formula tire Time series analysis driving/braking system is controlled, the loading speed of tire straight skidding rate is set and is added
Amplitude is carried, so that tire straight skidding rate is loaded according to the triangular wave of setting, straight skidding rate is loaded according to the triangular wave of setting
Mode, the test data in three periods of repeated acquisition, the test data include at least longitudinal force of tire, straight skidding rate,
Straight skidding rate loading speed and vertical load；
Five, according to expression formulaIt can be in the hope of formula parameters value, to acquire vertical by test result curve
To relaxed length lx, wherein Fx0Corresponding longitudinal force, V when for straight skidding rate being 0rFor simulated roadway movement speed, KxFor
Derivative when longitudinal force straight skidding rate is equal to 0 about straight skidding rate,Straight skidding when for straight skidding rate equal to zero
Rate loading speed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910046487.XA CN109612748B (en) | 2019-01-18 | 2019-01-18 | Method for measuring longitudinal loose length of tire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910046487.XA CN109612748B (en) | 2019-01-18 | 2019-01-18 | Method for measuring longitudinal loose length of tire |
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| CN109612748B CN109612748B (en) | 2020-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0921729A (en) * | 1995-07-10 | 1997-01-21 | Sumitomo Rubber Ind Ltd | Method for measuring slip rate of tire |
| CN102582625A (en) * | 2011-01-10 | 2012-07-18 | 通用汽车环球科技运作有限责任公司 | Linear and non-linear identification of the longitudinal tire-road friction coefficient |
| CN104458287A (en) * | 2014-12-23 | 2015-03-25 | 吉林大学 | Tire lateral relaxation length measurement method |
-
2019
- 2019-01-18 CN CN201910046487.XA patent/CN109612748B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0921729A (en) * | 1995-07-10 | 1997-01-21 | Sumitomo Rubber Ind Ltd | Method for measuring slip rate of tire |
| CN102582625A (en) * | 2011-01-10 | 2012-07-18 | 通用汽车环球科技运作有限责任公司 | Linear and non-linear identification of the longitudinal tire-road friction coefficient |
| CN104458287A (en) * | 2014-12-23 | 2015-03-25 | 吉林大学 | Tire lateral relaxation length measurement method |
Non-Patent Citations (1)
| Title |
|---|
| 李飞等: "轮胎侧偏非稳态特性测量方法研究", 《重庆理工大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111504663B (en) * | 2020-04-28 | 2021-03-23 | 吉林大学 | Method for measuring longitudinal and smooth relaxation length of tire based on transfer function |
Also Published As
| Publication number | Publication date |
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| CN109612748B (en) | 2020-07-24 |
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Inventor after: Lu Dang Inventor after: Lu Lei Inventor after: Suo Yanru Inventor after: Li Lun Inventor after: Lv Manyi Inventor after: Ma Yao Inventor after: Wang Wei Inventor after: Liu Qianjin Inventor before: Reed marsh Inventor before: Lu Lei Inventor before: Suo Yanru Inventor before: Li Lun Inventor before: Lv Manyi Inventor before: Ma Yao Inventor before: Wang Wei Inventor before: Liu Qianjin |
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Effective date of registration: 20220914 Address after: No. 299, Plant A3, Guantang Pioneer Park, No. 19, Chuyang Road, Liuzhou City, Guangxi Zhuang Autonomous Region 545000 Patentee after: Liuzhou Zhongdong Zhilun Technology Co.,Ltd. Address before: 130012 No. 2699 Qianjin Street, Jilin, Changchun Patentee before: Jilin University |
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