CN103759954B - A kind of method that tire drag is accurately tested and device - Google Patents

A kind of method that tire drag is accurately tested and device Download PDF

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CN103759954B
CN103759954B CN201410064402.8A CN201410064402A CN103759954B CN 103759954 B CN103759954 B CN 103759954B CN 201410064402 A CN201410064402 A CN 201410064402A CN 103759954 B CN103759954 B CN 103759954B
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tire
vertical load
pressure
supporting plate
dimension sensor
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CN103759954A (en
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卢荡
刘兵
吴海东
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Jilin University
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Jilin University
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Abstract

The invention discloses a kind of tire drag method for accurate testing and device, belong to tire dynamic property test test field, its tyre tester that can solve existing installation multi dimension sensor accurately can not measure the problem of tire drag.Measurement of rolling resistance of tire of the present invention is arrange tire by the side rake angle of test request and vertical load to be in the state that longitudinal force is zero, then to the clearing process of each power output passage of tire multi dimension sensor, and the test of resistance to rolling is started as the reference point that tire drag is tested, the crosstalk of vertical load to resistance to rolling can be eliminated like this, reach the object that tire drag is accurately tested.The invention allows for a kind of measurement mechanism, tire can be realized by this device and be in the state that longitudinal force is zero.The present invention can be widely used in the various tire characteristics testing table that multi dimension sensor is housed, and the resistance to rolling being applicable to various tire is accurately tested.

Description

A kind of method that tire drag is accurately tested and device
Technical field
The invention belongs to tire dynamic property test test field, be specifically related to a kind of tire drag method for accurate testing and device, by eliminating vertical load to the coupling crosstalk of resistance to rolling, accurately can measure the resistance to rolling of tire, the dynamics research for tire provides test figure more accurately.
Background technology
Tire is the vitals on automobile, and the acting force between car load and ground is all transmitted by tire.Mechanics of tire characteristic is the basis of automotive performance design and study, and has important impact to the performance such as security, operational stability, ride comfort of automobile.Tire mechanical property testing platform is one of the key equipment of tire characteristics modeling and Full Vehicle Modelling, integrated, adjustment and exploitation, it can realize the various operating conditions of tire, and measuring the kinematic parameter of six-freedom degree and the relation with ground multi dimension thereof, it is vehicle dynamics simulation design key Data Source.
The resistance to rolling of tire is the key parameter affecting Fuel consumption.Relative to loading of tire, tire drag numerical value is very little, and therefore its measurement is very difficult, very high to the requirement of equipment precision.At present, the method for domestic and international testing tire resistance to rolling is a lot, comprises dynamometry, power method, Torque method and retardation method etc., but no matter which kind of method, its test measurement result finally all should be converted into the resistance to rolling acted between tire and road surface.
The critical component of tire mechanical property testing platform is multi dimension sensor, but the coupling crosstalk of all various degrees between power output signal respectively tieed up by the actual multi dimension sensor used.Cause the factor of coupling crosstalk to mainly contain two aspects: one is the design concept, processing and manufacturing, sensitive element characteristic etc. of multi dimension sensor, two is multi dimension sensor alignment errors when using on testing table.This effect of intercoupling seriously constrains the measuring accuracy of sensor, and when especially respectively dimension power size differs greatly, the measuring error caused due to coupling influence should not be underestimated.Such as under normal circumstances, the vertical load of tire is about resistance to rolling 100 times, and therefore tire vertical load is a major issue needing to solve to the coupling that resistance to rolling produces.
For solving the coupling crosstalk problem of multi dimension sensor, before sensor dispatches from the factory, usually carry out the demarcation of multi dimension sensors coupled coefficient.The method of conventional linear decoupling zero makes retinoic acid syndrome reduce at present, but research shows, coupling is nonlinear, linear decoupling zero can not eliminate the coupling error existed in reality completely, and be record under specific good environment because demarcating, and point force snesor environment for use on tyre tester is relatively more severe, the coupling coefficient of sensor can be different.Moreover when installing multi dimension sensor on tyre tester, alignment error (as sensor perturbations angle), also can produce certain impact to retinoic acid syndrome coefficient.The factor cannot determined in above-mentioned actual tests makes the retinoic acid syndrome relation of sensor more complicated, is difficult to quantitative description in theory.Therefore, it may be necessary modified test method farthest to eliminate the impact of coupling.
Summary of the invention
The object of the invention is the deficiency in order to overcome in existing tire drag measuring accuracy, provide a kind of tire drag method for accurate testing and device.
By reference to the accompanying drawings, be described as follows:
A kind of method that tire drag is accurately tested, tire is set by the vertical load of test request and is in the state that longitudinal force is zero, by the clearing process to each power output passage of tire multi dimension sensor, sensor is kept to export and longitudinal force state consistency suffered by tire reality, and the test of resistance to rolling under tire rolling state is started as the reference point of tire drag test, eliminate vertical load to the coupling crosstalk of resistance to rolling; At least comprise the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, resets each power output passage of tire multi dimension sensor, starts to measure to gather;
3rd step: place suspension pallet arrangement between tire and road surface, the power that suspension supporting plate is suspended is greater than the vertical load F of tire z0, be in realize tire the state that longitudinal force is zero, and tire be slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0, again each power output passage of tire multi dimension sensor is reset afterwards, keeps measuring collection;
4th step: tire is lifted away from suspension supporting plate surface, remove suspension pallet arrangement, subsequently tire is pressed onto on road surface to vertical load be 0;
5th step: the sensitivity increasing each power output passage of tire multi dimension sensor, makes tire multi dimension sensor can the change of more Measurement accuracy side crops industry;
6th step: start tire drag testing experiment, and acquisition test data;
7th step: experimental data processing: the longitudinal force that the tire multi dimension sensor collected exports is tire drag; The vertical load that the tire multi dimension sensor collected is exported and the F recorded before z0be added the vertical load being tire.
The method that tire drag is accurately tested, at least comprises the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, and each power output passage of tire multi dimension sensor is reset, start to measure collection;
3rd step: place suspension pallet arrangement between tire and road surface, the power that suspension supporting plate is suspended is greater than the vertical load F of tire z0, be in realize tire the state that longitudinal force is zero, and tire be slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0with the F produced due to crosstalk couplings x0;
4th step: utilize F z0to the cross talk effects F longitudinally produced x0revise the vertical crosstalk couplings coefficient to longitudinal direction
a = F X 0 F Z 0 ;
5th step: according to formula F xcomp=F x-aF z0the more accurate tire drag F through revising can be obtained xcomp, wherein F xfor the measurement value in resistance to rolling direction obtained from sensor during test, coefficient a is the crosstalk couplings influence coefficient caused by vertical direction.
Suspension pallet arrangement described in step 3 is air floating table system, magnetic suspension system or hydraulic pressure suspension system that supporting plate is suspended.
A kind of tire drag precise testing device comprises: source of the gas 1, high-pressure air duct 2, sub-high pressure wireway 9, pressure controller mounting table 3, pressure controller 4, air floating table pedestal 5, pedestal air intake 11, venthole 7, suspension supporting plate 8;
Described source of the gas 1 is connected with the pressure controller 4 be placed on pressure controller mounting table 3 by high-pressure air duct 2, and source of the gas 1 provides pressure to be p 1gases at high pressure, can obtain stable pressure through pressure controller 4 is p 2sub-high pressure gas;
Described pressure controller 4 is communicated with the pedestal air intake 11 of air floating table pedestal 5 by sub-high pressure wireway 9;
Described air floating table pedestal 5 has multiple venthole 7, venthole total area S give vent to angerbe less than the cross-sectional area S of sub-high pressure wireway 9 pipe;
Described suspension supporting plate 8 covers on air floating table pedestal 5, the venthole total area S that it covers supporting plate is given vent to angerwith sub-high pressure gas pressure intensity p 2and the tire vertical load F of test request z0between there is following relation: S supporting plate is given vent to anger.p 2> F z0.
The aperture of described venthole 7 is less, can arrange more venthole like this, is beneficial to being uniformly distributed of gas flowfield, and the total area of venthole 7 can by formula S give vent to anger=n π r 2obtain, wherein S give vent to angerfor the total area of all ventholes, r is the radius of venthole, and n is the number of venthole.
A kind of tire drag precise testing device, also comprise flexible rope 6, described flexible rope 6 one end is fixed on air floating table pedestal 5, the other end is fixed on suspension supporting plate 8, flexible rope is four, and there is certain length, and can by the movement limit of suspension supporting plate 8 in certain area of space, this area of space can meet the various loads of test tire.
The present invention has the following advantages and technique effect:
1. the method for testing that proposes of the present invention and device can eliminate the error that tire vertical load causes rolling resistance measuring to the full extent, directly accurately can measure tire drag, raising tire drag measuring accuracy.
2. the method for testing that proposes of the present invention and device can be widely used in the various tire characteristics testing table that multi dimension sensor is housed, and comprise reciprocal flat tyre tester, flat rubber belting formula tyre tester, rotary drum tyre tester and have the tire mechanical property testing car of multi dimension sensor wheel.
3. the present invention propose method of testing and device be applicable to various tire, comprise vehicle tyre and the aircraft tyres such as passenger car, offroad vehicle, engineering machine vehicle, special purpose vehicle, motorcycle.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of tire drag method for accurate testing of the present invention;
Fig. 2 is that the present invention passes through to revise crosstalk couplings coefficient to the process flow diagram of tire drag method for accurate testing;
Fig. 3 is that the present invention's pallet arrangement that suspends is placed on connection diagram on flat tyre tester;
Fig. 4 is that the present invention suspends the plan structure schematic diagram of pallet arrangement;
Fig. 5 is that the present invention's pallet arrangement that suspends is placed on connection diagram on flat rubber belting formula tyre tester;
Fig. 6 is that the present invention's pallet arrangement that suspends is placed on connection diagram on rotary drum tyre tester;
Wherein: 1, source of the gas 2, high-pressure air duct 3, pressure controller mounting table 4, pressure controller 5, air floating table pedestal 6, flexible rope 7, venthole 8, suspension supporting plate 9, sub-high pressure wireway 10, tire mechanical property testing platform 11, pedestal air intake
Embodiment
Below in conjunction with accompanying drawing embodiment, technical scheme of the present invention is described further.
A kind of method that tire drag is accurately tested, tire is set by the side rake angle of test request and vertical load and is in the state that longitudinal force is zero, by the clearing process to each power output passage of tire multi dimension sensor, sensor is kept to export and longitudinal force state consistency suffered by tire reality, and the test of resistance to rolling under tire rolling state is started as the reference point of tire drag test, the coupling crosstalk of vertical load to resistance to rolling can be eliminated like this, also can by revising crosstalk couplings influence coefficient, reach the object that tire drag is accurately tested, at least comprise the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, and each power output passage of tire multi dimension sensor is reset, start to measure collection;
3rd step: place suspension pallet arrangement between tire and road surface, and tire is slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0, again each power output passage of tire multi dimension sensor is reset afterwards, keeps measuring collection;
4th step: tire is lifted away from suspension supporting plate surface, remove suspension pallet arrangement, subsequently tire is pressed onto on road surface to vertical load be 0;
5th step: the sensitivity increasing each power output passage of tire multi dimension sensor, makes tire multi dimension sensor can the change of more Measurement accuracy side crops industry;
6th step: start tire drag testing experiment, and acquisition test data;
7th step: experimental data processing: the longitudinal force that the tire multi dimension sensor collected exports is tire drag; The vertical load that the tire multi dimension sensor collected is exported and the F recorded before z0be added the vertical load being tire.
The method that tire drag is accurately tested, at least comprises the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, and each power output passage of tire multi dimension sensor is reset, start to measure collection;
3rd step: place suspension pallet arrangement between tire and road surface, the power that suspension supporting plate is suspended is greater than the vertical load F of tire z0, be in realize tire the state that longitudinal force is zero, and tire be slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0with the F produced due to crosstalk couplings x0;
4th step: utilize F z0to the cross talk effects F longitudinally produced x0revise the vertical crosstalk couplings coefficient to longitudinal direction
a = F X 0 F Z 0 .
5th step: according to formula F xcomp=F x-aF z0the more accurate tire drag F through revising can be obtained xcomp, wherein F xfor the measurement value in resistance to rolling direction obtained from sensor during test, coefficient a is the crosstalk couplings influence coefficient caused by vertical direction.
Conveniently test, the crosstalk couplings coefficient under different conventional vertical load can be calculated, during test, can directly call corresponding crosstalk couplings coefficient according to different vertical loads.
Described tire be in longitudinal force be zero state be that core wheel non-rolling, does not have side force, longitudinal force and aligning torque to put on tire in section, road surface without rotational restraint.
Tire mechanical property testing platform comprises reciprocal flat tyre tester, flat rubber belting formula tyre tester, rotary drum tyre tester and has the tire mechanical property testing car of multi dimension sensor wheel.Described tire mechanical property testing platform system utilizes the stressing conditions of multi dimension sensor test tire, and wherein multi dimension sensor at least can measure vertical load and the longitudinal force of tire, also can measure the whole six square phase of tire at the most.
Suspension pallet arrangement of the present invention is placed on the road surface of tire mechanical property testing platform, and is mated use.
Described suspension pallet arrangement is air floating table system, magnetic suspension system or hydraulic pressure suspension system that supporting plate is suspended.
As shown in Figure 3, Figure 4, suspension pallet arrangement of the present invention is air floating table system, comprising: source of the gas 1, high-pressure air duct 2, sub-high pressure wireway 9, pressure controller mounting table 3, pressure controller 4, air floating table pedestal 5, pedestal air intake 11, flexible rope 6, venthole 7, suspension supporting plate 8.The road surface that suspension pallet arrangement is placed on tire mechanical property testing platform 10 is mated use.
Described source of the gas 1 is connected with pressure controller 4 by high-pressure air duct 2, and pressure controller 4 is placed on pressure controller mounting table 3, and source of the gas provides air pressure to be p 1gases at high pressure, can obtain stable pressure through pressure controller 4 is p 2sub-high pressure gas;
The sub-high pressure gas that described pressure controller 4 exports is communicated with the pedestal air intake 11 of air floating table pedestal 5 by sub-high pressure wireway 9, for it continues the p that provides stable air pressure to be 2gas;
Described flexible rope 6 one end is fixed on air floating table pedestal 5, and the other end is fixed on suspension supporting plate 8, totally four.Flexible rope has certain length, and object is by the movement limit of suspension supporting plate in certain area of space, and this area of space can meet the various loads of test tire, and this region is also called the range of safety operation of suspension supporting plate.
Described air floating table pedestal 5 has multiple venthole 7, and sub-high pressure gas is acted on suspension supporting plate 8 by venthole, is held up.Therefore, when suspension supporting plate is held up by air pressure, in range of safety operation, suspension supporting plate can free movement;
The aperture of described venthole 7 is less, can arrange more venthole like this, is beneficial to being uniformly distributed of gas flowfield.The total area of all ventholes can by formula S give vent to anger=n π r 2obtain, n is venthole number, and r is the radius of venthole; Venthole total area S give vent to angerbe less than the cross-sectional area S of sub-high pressure wireway 9 pipe, can ensure that venthole stable gas pressure is controlled like this.The venthole total area S that suspension supporting plate 8 covers supporting plate is given vent to angerwith sub-high pressure gas pressure intensity p 2and there is following relation between the tire vertical load Fz0 of test request: S supporting plate is given vent to anger.p 2> F z0.
Described suspension pallet arrangement in use, can first tire be pressed onto on suspension supporting plate 8, allow again afterwards sub-high pressure gas by hold up suspension pallet 8 and on tire, can ensure that tire is more accurately pressed in suspension supporting plate centre of surface position like this, prevent suspension pallet from tilting.
Embodiment
The stable output pressure of source of the gas is the precision of 10MPa, pressure controller: 0.01MPa.
The vertical load F that certain Tire testing requires z0for 4000N, choosing the venthole that suspension supporting plate covers is 16, and venthole radius is 8mm, then the venthole total area S that covers of suspension supporting plate supporting plate is given vent to anger=16 × π r 2=32.15cm 2
For holding up F z0the vertical load of=4000N, according to the venthole total area S below suspension supporting plate supporting plate is given vent to angerwith sub-high pressure gas pressure intensity p 2and the tire vertical load F of test request z0between exist relation: S supporting plate is given vent to angerp 2> F z0, then p is had 2> 1.24MPa, therefore, need regulate pressure controller, makes sub-high pressure wireway air pressure meet p 2> 1.24MPa.
This tire drag accurate measurement method step is as follows:
The first step: the sensitivity that each power output passage of tire multi dimension sensor is set, longitudinal force Fx passage: 5000N/V, vertical load Fz:5000N/V;
Second step: make tire leave road surface, and each power output passage of tire multi dimension sensor is reset, start to measure collection;
3rd step: place suspension pallet arrangement between tire and road surface, and tire to be slowly pressed in suspension supporting plate centre of surface position to vertical load be 4000N, records the vertical load F that tire multi dimension sensor exports after tire vertical load is stablized z0=4000N, resets each power output passage of tire multi dimension sensor afterwards again, keeps measuring gathering;
4th step: tire is lifted away from suspension supporting plate surface, remove suspension pallet arrangement, subsequently tire is pressed onto on road surface to vertical load be 0N;
5th step: the sensitivity increasing each power output passage of tire multi dimension sensor, longitudinal force Fx passage: 200N/V, vertical load Fz:200N/V, now, makes tire multi dimension sensor can the change of more Measurement accuracy side crops industry;
6th step: start tire drag testing experiment, and acquisition test data;
7th step: experimental data processing: the longitudinal force that the tire multi dimension sensor collected exports is tire drag; The vertical load that the tire multi dimension sensor collected is exported and the F recorded before z0be added the vertical load being tire.
The method of testing that the present invention proposes and device directly accurately can measure tire drag, eliminate the error that tire vertical load causes rolling resistance measuring to the full extent, also by correcting vertical load to the crosstalk couplings coefficient of longitudinal force, the error that crosstalk reduction causes, improves tire drag measuring accuracy.
The above-mentioned description to embodiment understands for the ease of these those skilled in the art and applies the invention of this test method.Person skilled in the art obviously easily can make various amendment to these examples, and the General Principle of this invention is applied in other examples.These amendments and modification all in the aim and scope of the application, and fall in the protection domain of claims.

Claims (6)

1. a tire drag method for accurate testing, it is characterized in that: tire is set by the vertical load of test request and is in the state that longitudinal force is zero, by the clearing process to each power output passage of tire multi dimension sensor, sensor is kept to export and longitudinal force state consistency suffered by tire reality, and the test of resistance to rolling under tire rolling state is started as the reference point of tire drag test, eliminate vertical load to the coupling crosstalk of resistance to rolling, at least comprise the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, resets each power output passage of tire multi dimension sensor, starts to measure to gather;
3rd step: place suspension pallet arrangement between tire and road surface, the power that suspension supporting plate is suspended is greater than the vertical load F of tire z0, be in realize tire the state that longitudinal force is zero, and tire be slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0, again each power output passage of tire multi dimension sensor is reset afterwards, keeps measuring collection;
4th step: tire is lifted away from suspension supporting plate surface, remove suspension pallet arrangement, subsequently tire is pressed onto on road surface to vertical load be 0;
5th step: the sensitivity increasing each power output passage of tire multi dimension sensor, makes tire multi dimension sensor can the change of more Measurement accuracy side crops industry;
6th step: start tire drag testing experiment, and acquisition test data;
7th step: experimental data processing: the longitudinal force that the tire multi dimension sensor collected exports is tire drag; The vertical load that the tire multi dimension sensor collected is exported and the F recorded before z0be added the vertical load being tire.
2. a tire drag method for accurate testing, at least comprises the following steps:
The first step: the sensitivity arranging each power output passage of tire multi dimension sensor, makes the vertical load of its applicable test request;
Second step: make tire leave road surface, and each power output passage of tire multi dimension sensor is reset, start to measure collection;
3rd step: place suspension pallet arrangement between tire and road surface, the power that suspension supporting plate is suspended is greater than the vertical load F of tire z0, be in realize tire the state that longitudinal force is zero, and tire be slowly pressed in the vertical load of suspension supporting plate centre of surface position to test request, after tire vertical load is stablized, record the vertical load F that tire multi dimension sensor exports z0with the F produced due to crosstalk couplings x0;
4th step: utilize F z0to the cross talk effects F longitudinally produced x0revise the vertical crosstalk couplings coefficient to longitudinal direction a = F X 0 F Z 0 ;
5th step: according to formula F xcomp=F x-aF z0the more accurate tire drag F through revising can be obtained xcomp, wherein F xfor the measurement value in resistance to rolling direction obtained from sensor during test, coefficient a is the crosstalk couplings influence coefficient caused by vertical direction.
3. a kind of tire drag according to claim 1 and 2 method of accurately testing, is characterized in that: the suspension pallet arrangement described in step 3 is air floating table system, magnetic suspension system or hydraulic pressure suspension system that supporting plate is suspended.
4. realize a device for the tire drag method for accurate testing described in claim 1 or 2, it is characterized in that: comprise source of the gas (1), high-pressure air duct (2), sub-high pressure wireway (9), pressure controller mounting table (3), pressure controller (4), air floating table pedestal (5), pedestal air intake (11), venthole (7), suspension supporting plate (8);
Described source of the gas (1) is connected with the pressure controller (4) be placed on pressure controller mounting table (3) by high-pressure air duct (2), and source of the gas (1) provides pressure to be p 1gases at high pressure, can obtain stable pressure through pressure controller (4) is p 2sub-high pressure gas;
Described pressure controller (4) is communicated with the pedestal air intake (11) of air floating table pedestal (5) by sub-high pressure wireway (9);
Described air floating table pedestal (5) has multiple venthole (7), venthole total area S give vent to angerbe less than the cross-sectional area S of sub-high pressure wireway (9) pipe;
Described suspension supporting plate (8) covers on air floating table pedestal (5), the venthole total area S that it covers supporting plate is given vent to angerwith sub-high pressure gas pressure intensity p 2and the tire vertical load F of test request z0between there is following relation: S supporting plate is given vent to anger.p 2> F z0.
5. a kind of tire drag precise testing device according to claim 4, is characterized in that: described multiple ventholes (7), are conducive to being uniformly distributed of gas flowfield, and the total area of venthole (7) can by formula S give vent to anger=n π r 2obtain, wherein S give vent to angerfor the total area of all ventholes, r is the radius of venthole, and n is the number of venthole.
6. a kind of tire drag precise testing device according to claim 4, it is characterized in that: it also comprises flexible rope (6), described flexible rope (6) one end is fixed on air floating table pedestal (5), the other end is fixed on suspension supporting plate (8), flexible rope is four, for limiting the space of suspension supporting plate (8), this area of space can meet the various loads of test tire.
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