CN109612748B - Method for measuring longitudinal loose length of tire - Google Patents

Method for measuring longitudinal loose length of tire Download PDF

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CN109612748B
CN109612748B CN201910046487.XA CN201910046487A CN109612748B CN 109612748 B CN109612748 B CN 109612748B CN 201910046487 A CN201910046487 A CN 201910046487A CN 109612748 B CN109612748 B CN 109612748B
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tire
longitudinal
test
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flat belt
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CN109612748A (en
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卢荡
卢磊
索艳茹
李论
吕满意
马尧
王伟
刘前进
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Liuzhou Zhongdong Zhilun Technology Co ltd
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Jilin University
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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 method for measuring the longitudinal loose length of tyre includes such steps as installing the tyre on a flat-belt type six-component tyre test bench, regulating the slip angle and the roll angle to zero, regulating the flat-belt type six-component tyre test bench to make the tyre reach the required vertical load, rolling the tyre at constant speed, applying driving and braking torque, controlling the longitudinal slip rate of tyre, changing the longitudinal slip rate according to the triangular waves with set period and amplitude to obtain the test data of multiple periods, and identifying the parameters to obtain the longitudinal loose length of tyre. The invention has simple operation and reduces the test workload; the influence rule of different road surface speeds on the longitudinal relaxation length can be researched; the influence rule of loading rates with different longitudinal slip rates on the longitudinal relaxation length can be researched.

Description

Method for measuring longitudinal loose length of tire
Technical Field
The invention belongs to the field of tire mechanical property tests, and particularly relates to a method for measuring the longitudinal relaxation length of a tire.
Background
The tire is the only part of vehicle and road surface contact, and the interaction force between tire and the road surface is the root cause of vehicle motion, and the mechanical properties of tire has very important influence to whole car dynamic nature, control stability, ride comfort etc.. The tire mechanical property test is the basis for building a tire model, and the six-component force relation between the motion parameters of the tire and the road surface can be obtained through the tire mechanical property test.
The physical quantity-longitudinal relaxation length for describing and representing the transient characteristic of the tire is introduced into a tire longitudinal unsteady state model applied to the longitudinal dynamic simulation of the whole vehicle, the longitudinal relaxation length of the tire is a key index in the longitudinal dynamic characteristic of the tire, and the magnitude of the longitudinal relaxation length determines the response speed of six components of the tire, so that the accurate measurement of the longitudinal relaxation length is the key for establishing a high-precision tire longitudinal model.
At present, the method for testing the longitudinal loose length of the tire mainly comprises the following steps: from the concept of longitudinal slack length, it can be derived that the longitudinal slack length is equal to the ratio of the tire longitudinal stiffness to the tire longitudinal stiffness. The tire longitudinal-slip stiffness can be obtained from a tire steady-state longitudinal-slip test, namely: the slope of the longitudinal force curve when the longitudinal slip ratio is zero; the tire longitudinal stiffness can be obtained by testing the tire in a static state by applying a longitudinal displacement, namely: ratio of tire longitudinal force to longitudinal displacement. The method obtains approximate values of the longitudinal relaxation length of the tire, because the longitudinal rigidity of the tire in a static state is not completely the same as the longitudinal rigidity of the tire in a rolling state; two tire testing test beds are needed for measuring the longitudinal relaxation length of the tire by the method, and the test cost is higher; the method cannot obtain the longitudinal relaxation lengths corresponding to different tire rolling speeds and different longitudinal slip rate loading rates.
In summary, in order to obtain accurate longitudinal slack length values representing different speeds and different longitudinal slip rate loading rates, a testing method for the longitudinal slack length of a tire, which is convenient to implement and can ensure accuracy, is required.
Disclosure of Invention
In order to overcome the technical defects, the invention provides the method for measuring the longitudinal relaxation length of the tire, so that the test is simple and reliable, and the test precision is more accurate.
A method of measuring a longitudinal slack length of a tire, the method comprising:
the method comprises the steps of installing a tire on a flat belt type tire six-component force test bed, adjusting a slip angle and a roll angle to be zero, adjusting the flat belt type tire six-component force test bed to enable the tire to reach a required vertical load, driving the tire to roll by the test bed at a constant speed, applying driving and braking torque, controlling the longitudinal slip rate of the tire, enabling the longitudinal slip rate to change according to a set period and triangular waves with set amplitudes to obtain test data of a plurality of periods, and performing parameter identification to obtain the longitudinal relaxation length of the tire. The method specifically comprises the following steps:
mounting a test tire on a flat belt type tire six-component force test bed, adjusting a lateral inclination angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral inclination angle of the tire to be zero, and adjusting a lateral deflection angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral deflection angle of the tire to be zero; adjusting a tire pressure control mechanism of a flat belt type tire six-component force test bench to enable the tire pressure of the tire to reach a specified value;
adjusting a vertical loading structure of the flat belt type tire six-component force test bed to enable the tire to be pressed on a flat belt road surface, enabling the tire vertical load to reach the load required by the test, and keeping the vertical load stable in the test process;
thirdly, preheating and rolling the tire to reach the tire testing temperature required by the test, and adjusting the tire pressure to be the tire pressure required by the test; because the internal temperature of the tire increases after the tire is preheated and rolled, and the tire pressure increases due to the expansion and contraction effect of the gas, the tire pressure of the tire needs to be regulated again after preheating;
fourthly, controlling a driving and braking system of the flat belt type tire six-component test bed, and setting a loading rate and a loading amplitude of a tire longitudinal slip rate, so that the tire longitudinal slip rate is loaded according to a set triangular wave, the longitudinal slip rate repeatedly acquires test data of three periods according to a set triangular wave loading mode, and the test data at least comprises a tire longitudinal force, a longitudinal slip rate loading rate and a vertical load;
fifthly, according to the expression
Figure BDA0001949340450000031
The values of the various parameters of the formula can be determined from the test result curve, so that the longitudinal relaxation length l can be determinedxWherein F isx0The longitudinal force V corresponding to the longitudinal slip ratio of 0rTo simulate the speed of travel of the road surface, KxThe derivative with respect to the longitudinal slip ratio when the longitudinal force longitudinal slip ratio is equal to 0,
Figure BDA0001949340450000032
the longitudinal slip rate loading rate is the rate at which the longitudinal slip rate equals zero.
The invention has the beneficial effects that:
1. the measuring method is simple to operate, and the test workload is reduced.
2. The invention can research the influence rule of different road surface speeds on the longitudinal relaxation length.
3. The invention can research the influence rule of loading rates with different longitudinal slip rates on the longitudinal relaxation length.
Drawings
FIG. 1 is a diagram of a measurement model according to the present invention.
Fig. 2 is a schematic diagram of an actual test curve. Because of the quasi-steady state test method, S isxF corresponds to position 0x01And Fx02Two forces, taking F in the calculationx0＝Fx01-Fx02。
Detailed Description
A method of measuring a longitudinal slack length of a tire, the method comprising:
the method comprises the following steps of installing a tire on a flat belt type tire six-component force test bed, adjusting a slip angle and a roll angle to be zero, adjusting the flat belt type tire six-component force test bed to enable the tire to reach a required vertical load, driving the tire to roll by the test bed at a constant speed, applying driving and braking torque, controlling the longitudinal slip rate of the tire, enabling the longitudinal slip rate to change according to a set period and triangular waves with set amplitudes to obtain test data of a plurality of periods, and identifying parameters to obtain the longitudinal relaxation length of the tire, wherein the method specifically comprises the following steps:
mounting a test tire on a flat belt type tire six-component force test bed, adjusting a lateral inclination angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral inclination angle of the tire to be zero, and adjusting a lateral deflection angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral deflection angle of the tire to be zero; adjusting a tire pressure control mechanism of a flat belt type tire six-component force test bench to enable the tire pressure of the tire to reach a specified value;
adjusting a vertical loading structure of the flat belt type tire six-component force test bed to enable the tire to be pressed on a flat belt road surface, enabling the tire vertical load to reach the load required by the test, and keeping the vertical load stable in the test process;
thirdly, preheating and rolling the tire to reach the tire testing temperature required by the test, and adjusting the tire pressure to be the tire pressure required by the test; because the internal temperature of the tire increases after the tire is preheated and rolled, and the tire pressure increases due to the expansion and contraction effect of the gas, the tire pressure of the tire needs to be regulated again after preheating;
fourthly, controlling a driving and braking system of the flat belt type tire six-component test bed, and setting a loading rate and a loading amplitude of a tire longitudinal slip rate, so that the tire longitudinal slip rate is loaded according to a set triangular wave, the longitudinal slip rate repeatedly acquires test data of three periods according to a set triangular wave loading mode, and the test data at least comprises a tire longitudinal force, a longitudinal slip rate loading rate and a vertical load;
fifthly, according to the expression
Figure BDA0001949340450000041
The values of the various parameters of the formula can be determined from the test result curve, so that the longitudinal relaxation length l can be determinedxWherein F isx0The longitudinal force V corresponding to the longitudinal slip ratio of 0rTo simulate the speed of travel of the road surface, KxThe derivative with respect to the longitudinal slip ratio when the longitudinal force longitudinal slip ratio is equal to 0,
Figure BDA0001949340450000051
the longitudinal slip rate loading rate is the rate at which the longitudinal slip rate equals zero.
As shown in fig. 1 and 2, the longitudinal slack length formula
Figure BDA0001949340450000052
The following is obtained:
u: amount of deformation of carcass
Figure BDA0001949340450000053
Speed of deformation of carcass
Fx: longitudinal force
K: longitudinal rigidity of tyre body
C: tread damping
Vsx: longitudinal slip velocity of tire
Analysis of stress at point a, there are:
Figure BDA0001949340450000058
to FxThe derivation is given as-K · u,
is provided with
Figure BDA0001949340450000054
Then
Figure BDA0001949340450000055
In the tire model, there are
Figure BDA0001949340450000056
Obtaining the tire tread damping coefficient according to the damping force as the damping coefficient and the speed
Figure BDA0001949340450000057
Wherein SxIs the longitudinal slip ratio of the tire, KxFor the longitudinal and smooth stiffness of the tyre, VxIs the longitudinal speed of the tire, VrTo simulate the speed of movement of the road.
Substituting equation (3) into equation (1), there are
Figure BDA0001949340450000061
Figure BDA0001949340450000062
Substituting equation (5) into equation (7) has
Figure BDA0001949340450000063
Defined in terms of longitudinal slack length, has
Figure BDA0001949340450000064
Substituting equation (9) into equation (8) has
Figure BDA0001949340450000065
When S isxWhen equal to 0, there is
Figure BDA0001949340450000066
Wherein: fx0Is SxThe longitudinal force at 0 is equal to,
Figure BDA0001949340450000067
is SxThe derivative of the longitudinal force at 0 to the longitudinal slip rate is given by equation (11), with
Figure BDA0001949340450000068
Wherein:
Figure BDA0001949340450000069
the derivative of the longitudinal slip ratio of the tire at zero over time is also referred to as the longitudinal slip ratio loading rate at zero.

Claims (1)

1. A method for measuring a longitudinal slack length of a tire, characterized by: the method comprises the following steps:
mounting a test tire on a flat belt type tire six-component force test bed, adjusting a lateral inclination angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral inclination angle of the tire to be zero, and adjusting a lateral deflection angle control mechanism of the flat belt type tire six-component force test bed to enable a lateral deflection angle of the tire to be zero; adjusting a tire pressure control mechanism of a flat belt type tire six-component force test bench to enable the tire pressure of the tire to reach a specified value;
adjusting a vertical loading structure of the flat belt type tire six-component force test bed to enable the tire to be pressed on a flat belt road surface, enabling the tire vertical load to reach the load required by the test, and keeping the vertical load stable in the test process;
thirdly, preheating and rolling the tire to reach the tire testing temperature required by the test, and adjusting the tire pressure to be the tire pressure required by the test; because the internal temperature of the tire increases after the tire is preheated and rolled, and the tire pressure increases due to the expansion and contraction effect of the gas, the tire pressure of the tire needs to be regulated again after preheating;
fourthly, controlling a driving and braking system of the flat belt type tire six-component test bed, and setting a loading rate and a loading amplitude of a tire longitudinal slip rate, so that the tire longitudinal slip rate is loaded according to a set triangular wave, the longitudinal slip rate repeatedly acquires test data of three periods according to a set triangular wave loading mode, and the test data at least comprises a tire longitudinal force, a longitudinal slip rate loading rate and a vertical load;
fifthly, according to the expression
Figure FDA0002485535950000011
The values of the various parameters of the formula can be determined from the test result curve, so that the longitudinal relaxation length l can be determinedxWherein F isx0The longitudinal force V corresponding to the longitudinal slip ratio of 0rTo simulate the speed of travel of the road surface, KxThe derivative with respect to the longitudinal slip ratio when the longitudinal force longitudinal slip ratio is equal to 0,
Figure FDA0002485535950000012
the longitudinal slip rate loading rate is the rate at which the longitudinal slip rate equals zero.
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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
CN115219246A (en) * 2022-04-06 2022-10-21 广州汽车集团股份有限公司 Method and device for measuring lateral relaxation length of tire

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CN104458287A (en) * 2014-12-23 2015-03-25 吉林大学 Tire lateral relaxation length measurement method

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JP3182319B2 (en) * 1995-07-10 2001-07-03 住友ゴム工業株式会社 Relative measurement method of tire slip ratio
US8498775B2 (en) * 2011-01-10 2013-07-30 GM Global Technology Operations LLC Linear and non-linear identification of the longitudinal tire-road friction coefficient

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