CN104075895A - Method and device for measuring tire high-speed uniformity - Google Patents

Abstract

The invention discloses a method for measuring tire high-speed uniformity. A tire is arranged on a tire rotor drum testing machine and a rotating shaft of the tire is connected with a plurality of force sensors and rotary encoders respectively. The method includes the steps that S1, when the rotating speed of the tire reaches a preset high-speed state, the force sensors collect signals of the force applied on the rotating shaft by the tire in the vertical, transverse and longitudinal directions; S2, a data collection plate collects force signals according to pulse signals sent by the rotary encoders, establishes a relation between the force signals and rotation angles of the tire, and measures the uniformity of the tire according to a time domain synchronization average algorithm and the relation. The method has the advantages of being simple and capable of reducing measurement cost, and the requirement for the technology can be met as well. The invention further discloses a system for measuring the tire high-speed uniformity.

Description

For measuring the method and system of high speed uniformity in tires

Technical field

The present invention relates to measuring wheel tyre uniformity technical field, relate in particular to a kind of for measuring the method and system of high speed uniformity in tires.

Background technology

Current Chinese tire industry circle, in the time of measuring wheel tyre uniformity, generally except static unbalance and crown change in radius,, outside out-of-roundness, rolls in addition dynamic radial force variation and transverse force and changes.And in the process of measuring wheel tyre uniformity, rolling speed is all very slow, approximately per second is turned around.Speed discrepancy when this uses than reality an order of magnitude.Why like this, reason has following 3 points: 1) evenness tester on production line, except checking homogeneity, generally also has the function of homogeneity correction, with the emery wheel of High Rotation Speed, tire tread rubber is ground off to a little, to improve tyre evenness, therefore, tire rotational speed can not be too fast; 2) High Rotation Speed is high to steelframe requirement, otherwise there will be resonance, and therefore, it is very expensive that equipment price can become; 3) less demanding to high speed performance.

But in fact, the power being produced by unevenness is along with the speed of tire increases, for example, the increase of the centrifugal force that quality is inhomogeneous produced, is and square being directly proportional of speed.What is more, and in the time that the fluctuation change frequency of power approaches carcass resonant frequency, the vibration amplitude that resonant interaction can make unevenness encourage is larger.The unevenness recording under the slow-speed of revolution, and the result of gained is distinct when High Rotation Speed.Therefore, improve the comfortableness of tire, the noise that reduces vibrations and cause, must directly measure its high speed uniformity.

At present general high speed uniformity in tires testing machine, as previously mentioned, with the drum tester of having strengthened support rigidity, on tire axle, installing vertical, horizontal and vertical (is F _z, F _yand F _x) sensor of three direction power, the variation of measuring tire force.For fear of using heavy and expensive reinforced support, the Gerald Potts of the U.S. has invented a kind of high speed uniformity testing machine of simplification, utilize the signal of acceleration transducer, vibrate through calculating to try to achieve by steelframe the inertial force causing, thereby cancellation is disturbed in force sensor signals, obtain correct tire and produced the data of the variation of power by homogeneity.

But, although aforementioned two kinds of methods can meet the demand of tire uniformity measurement, all comparatively complicated, and measure cost costliness.

Summary of the invention

Object of the present invention is intended to solve at least to a certain extent one of above-mentioned technological deficiency.

For this reason, one object of the present invention is to propose a kind of for measuring the method for high speed uniformity in tires.The method has advantages of simplification, reduces and measure cost, and can meet equally technical demand.

Another object of the present invention is to propose a kind of for measuring the system of high speed uniformity in tires.

To achieve these goals, one aspect of the present invention embodiment for measuring the method for high speed uniformity in tires, described tire is arranged on tire drum tester, the rotating shaft of described tire is connected with multiple power sensors and rotary encoder respectively, described method comprises: S1, after the rotating speed of described tire reaches default fast state, and described multiple power sensors gather described tire to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft; Force signal described in the pulse signal acquisition that S2, data acquisition board send according to described rotary encoder, and by opening relationships between described force signal and the anglec of rotation of described tire, and measure the homogeneity of described tire according to Domain Synchronous average algorithm and described relation.

According to the embodiment of the present invention for measuring the method for high speed uniformity in tires, after the rotating speed of tire reaches default fast state, multiple power sensors can gather the vertical of tire countershaft, laterally, force signal in longitudinal three directions, the pulse signal acquisition force signal that data acquisition board can send according to rotary encoder, and by opening relationships between force signal and the anglec of rotation of tire, and according to the homogeneity of Domain Synchronous average algorithm and relation measurement tire, it is simple many that the method that the present invention proposes is wanted, therefore reduced measurement cost, and can meet equally technical demand.

To achieve these goals, the present invention on the other hand embodiment for measuring the system of high speed uniformity in tires, comprise: tire drum tester, multiple power sensor, rotary encoder and data acquisition board, wherein, described multiple power sensor is connected with the rotating shaft of the tire in described tire drum tester, described multiple power sensor, for after the rotating speed of described tire reaches default fast state, gathers described tire to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft; Described rotary encoder is connected with the rotating shaft of described tire, and described rotary encoder is for transmitted signal; Described data acquisition board is for according to force signal described in described pulse signal acquisition, and by opening relationships between described force signal and the anglec of rotation of described tire, and measures the homogeneity of described tire according to Domain Synchronous average algorithm and described relation.

According to the embodiment of the present invention for measuring the system of high speed uniformity in tires, can be by multiple power sensors after the rotating speed of tire reaches default fast state, gather the vertical of tire countershaft, laterally, force signal in longitudinal three directions, the pulse signal acquisition force signal that data acquisition board sends according to rotary encoder, and by opening relationships between this force signal and the anglec of rotation of tire, and according to the homogeneity of Domain Synchronous average algorithm and this relation measurement tire, it is simple many that the method that the present invention proposes is wanted, therefore reduced measurement cost, and can meet equally technical demand.

The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.

Brief description of the drawings

The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviously and easily and understand, wherein:

Fig. 1 is according to an embodiment of the invention for measuring the process flow diagram of method of high speed uniformity in tires;

Fig. 2 be according to the present invention a specific embodiment for measuring the process flow diagram of method of high speed uniformity in tires;

Fig. 3 is according to an embodiment of the invention for measuring the structural representation of system of high speed uniformity in tires; And

Fig. 4 be according to the embodiment of the present invention for measuring the schematic diagram of system of high speed uniformity in tires.

Embodiment

Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.

At present, vibrations when high speed uniformity in tires directly affects Vehicle Driving Cycle and noise, be riding comfort and the key factor that reduces neighbourhood noise.In the major technique threshold of new car match tire, except low-rolling-resistance, be exactly maneuvering performance and riding comfort.Making Chinese automobile energy and world-class brand competition, is unavoidable technological challenge in high-comfort qualitatively improvement.In addition, because the environmental consciousness of country of Europe, the United States is more and more high, for example, from in November, 2012, the restriction of the noise of European Union's new legislation to new tire has proposed higher standard, and What is more, also specifies that new tire must be labelled, indicate the grade at resistance to rolling, anti-slippery and tyre noise three aspects:, and wherein the highest with the technical difficulty of tyre noise.

The mechanism that tyre noise produces can be divided into two large class, i.e. the air pump effect of study on tire pattern and the yo-yo effects of carcass.The technology that reduces air pump effect noise due to tread patterns designed is quite ripe, and the space that therefore can improve is more limited.Fall under low noise pressure continuous requirement, people start to note the possibility with noise reduction from improving carcass vibration.Wherein obvious with the truck tyre of load-carrying, because its inflation is pressed generally compared with will the exceeding more than four times of tyres for passenger cars, just as the drum head of tightening, ring more and ring.No matter consider from the design of tire carcass structure, be change the vibration frequency of each mode or manage constrained vibration amplitude, and its means and effect are mostly more limited, and therefore carcass shakes big or small difference, mainly comes from the difference of driving source.In other words, be exactly the problem of tyre evenness, especially, in the time of high speed scroll, vibration can be more violent.Hence one can see that, and the high speed uniformity of tire has vital impact to reducing tyre noise.But how measuring high speed uniformity in tires has become problem demanding prompt solution.

For this reason, the present invention proposes a kind of for measuring the method and system of high speed uniformity in tires.Particularly, below with reference to accompanying drawing describe according to the embodiment of the present invention for measuring the method and system of high speed uniformity in tires.

Fig. 1 is according to an embodiment of the invention for measuring the process flow diagram of method of high speed uniformity in tires.It should be noted that, in an embodiment of the present invention, tire is arranged on tire drum tester, and the rotating shaft of tire is connected with multiple power sensors and rotary encoder respectively.

As shown in Figure 1, this method that is used for measuring high speed uniformity in tires can comprise:

S101, after the rotating speed of tire reaches default fast state, multiple power sensors gather the force signal in vertical, horizontal, longitudinal three directions of tire countershafts.

Wherein, in one embodiment of the invention, default fast state can be that system sets in advance, and also can be that user oneself arranges, and can be regarded as after tire travels through preheating, starts to enter constant speed steady state (SS).It should be noted that, in the inhomogeneity process of measurement, the rotational speed of tire can remain on specific fast state always, but according to actual measuring method and standard, can choose multiple different speed class and measure respectively.

In addition, in one embodiment of the invention, multiple power sensors can comprise the first power sensor, the second power sensor and the 3rd power sensor.Wherein, in an embodiment of the present invention, the first power sensor can gather the force signal in the vertical direction of tire, and the second power sensor can gather the force signal in a lateral direction of tire, and the 3rd power sensor can gather the force signal on the longitudinal direction of tire.

Particularly, when tire travels through preheating, after starting to enter constant speed steady state (SS), multiple power sensors gather respectively the force signal (Fz, Fy, Fx) in vertical, horizontal, longitudinal three directions (z, y, x) of tire countershaft.

S102, the pulse signal acquisition force signal that data acquisition board sends according to rotary encoder, and by opening relationships between force signal and the anglec of rotation of tire, and according to the homogeneity of Domain Synchronous average algorithm and relation measurement tire.

In one embodiment of the invention, when tire often revolves while turning around, rotary encoder can send N pulse signal, and wherein N is positive integer.

Particularly, force signal Fx, Fy, Fz that data acquisition board can be passed back according to the multiple power sensors that collect, the pulse signal sending with rotary encoder can demonstrate three direction x orthogonal in rotating shaft, y, counter-force on z is with the cyclical variation rule of tyre rotation, and can calculate according to counter-force the homogeneity of tire with the relation of the anglec of rotation of tire.Should be appreciated that in an embodiment of the present invention, the pulsed frequency of rotary encoder is the sample frequency of multiple power sensors, can will between the force signal of multiple power sensor collection and tire rotation angle, set up relation one to one thus.

It should be noted that, tire, in the process of High Rotation Speed, due to the uneven distribution of its quality, can produce periodic counter-force in rotating shaft, and its frequency is the integral multiple of tyre rotation frequency.But the noise signal that the counter-force signal of reflection unevenness can be produced by plant equipment such as tire drum tester 100, rotary drums is disturbed, sometimes noise signal is excessively strong, cover useful periodic signal, therefore be necessary to use Domain Synchronous average algorithm, will with the incoherent signal cancellation of tyre rotation cycle.

Also it should be noted that, basic assumption of the present invention is: the various power that tire unevenness produces are when walking " periodic functions ", and with the rotary synchronous of tire.So, after the rotating speed of tire reaches stable fast state, can be according to Domain Synchronous average algorithm by the undesired signal and the frequency signal not identical with tire rotation frequency that produce at random, stack repeatedly then on average after cancellation gradually.That is to say, " signal to noise ratio (S/N ratio) " of the function that measure, after Synchronization overlapping and averaging repeatedly, for example 10 times to 100 times, can be improved widely.Therefore, the undesired signal of the vibration of the steelframe on testing machine gained can be eliminated effectively.

In one embodiment of the invention, the detailed process of Domain Synchronous average algorithm is as described below:

If the counter-force signal that power sensor obtains is x (t), is x according to the signal after sample frequency f discretize _n=x (n Δ), Δ is sampling interval.Cut apart according to the swing circle T of tire the signal collecting, by x _nbe divided into P section, every section is rotated scrambler and is divided into N sampled point, and the sampled point signal of same phase in P section is averaged, and combination obtains the signal of one-period.So, eliminated the incoherent noise signal of frequency.If adopt arithmetic mean method to average, Domain Synchronous average signal:

${\stackrel{\‾}{x}}_n=\frac{1}{P}\underset{P=0}{\overset{P-1}{\mathrm{\Σ}}}\left(x_{n+\mathrm{PN}}\right)---\left(1\right)$

Formula (1) is carried out obtaining after transform:

$\stackrel{\‾}{X}\left(z\right)=\frac{1}{P}\underset{P=0}{\overset{P-1}{\mathrm{\Σ}}}Z\left(x_{n+\mathrm{PN}}\right)=\frac{1}{P}X\left(z\right)\underset{P=0}{\overset{P-1}{\mathrm{\Σ}}}{z}^{\mathrm{PN}}---\left(2\right)$

Make z=e ^{2 π jf Δs}, formula (2) is carried out obtaining after abbreviation to the frequency response function of time domain average:

$H\left(f\right)=\frac{1-e^{2\mathrm{\πif\ΔPN}}}{P(1-e^{2\mathrm{\πif\ΔN}})}---\left(3\right)$

Formula (3) is solved, and the amplitude-frequency, the phase-frequency characteristic that solve Domain Synchronous average system are:

$\left|H\left(f\right)\right|=\frac{1}{P}\left|\frac{\sin \mathrm{P\π}(f/f_0)}{\sin \mathrm{\π}(f/f_0)}\right|---\left(4\right)$

Φ(f)＝π(P-1)f/f ₀ (5)

If the power spectrum of random noise is constant S _x, the power spectrum S after synchronous by time domain average _y(f) can be written as:

S _y(f)＝S _x|H(f)| ² (6)

S in the frequency domain cycle _y(f) gross energy is:

${\∫}_{-f_0/2}^{f_0/2}{S}_y\left(f\right)\mathrm{df}={\∫}_{-f_0/2}^{f_0/2}{S}_x{\left|H\left(f\right)\right|}^2\mathrm{df}---\left(7\right)$

Signal to noise ratio (S/N ratio) is:

$S_{\mathrm{NR}}=\frac{1}{f_0{S}_x}{\∫}_{-f_0/2}^{f_0/2}{S}_y\left(f\right)\mathrm{df}=\frac{1}{f_0}{\∫}_{-f_0/2}^{f_0/2}{\left|H\left(f\right)\right|}^2\mathrm{df}=\frac{1}{\mathrm{\π}{P}^2}{\∫}_{-f_0/2}^{f_0/2}\frac{{\sin }^2\mathrm{Px}}{{\sin }^{2}x}\mathrm{dx}=\frac{1}{P}$

Above formula (8) shows, the random noise power after Domain Synchronous is average is reduced to original 1/P.

Thus, can according to Domain Synchronous average algorithm first will with the incoherent signal cancellation of tyre rotation cycle, can calculate according to counter-force afterwards the homogeneity of tire with the relation of the anglec of rotation of tire.

According to the embodiment of the present invention for measuring the method for high speed uniformity in tires, after the rotating speed of tire reaches default fast state, multiple power sensors can gather the vertical of tire countershaft, laterally, force signal in longitudinal three directions, the pulse signal acquisition force signal that data acquisition board can send according to rotary encoder, and by opening relationships between force signal and the anglec of rotation of tire, and according to the homogeneity of Domain Synchronous average algorithm and relation measurement tire, it is simple many that the method that the present invention proposes is wanted, therefore reduced measurement cost, and can meet equally technical demand.

Fig. 2 be according to the present invention a specific embodiment for measuring the process flow diagram of method of high speed uniformity in tires.

In order to improve degree of accuracy, in an embodiment of the present invention, the rotating cycle that makes tire is M, and 360 degree of circle are divided into N decile, in the time that tire rotation one encloses, can gather the force signal in vertical, horizontal, longitudinal three directions of tire countershaft in every decile, and after tire rotation M circle, the force signal respectively every decile being collected after M circle is averaging, and the force signal and the relation that after M circle, collect according to the every decile after being averaging, determines the homogeneity of tire.Particularly, as shown in Figure 2, this method that is used for measuring high speed uniformity in tires can comprise:

S201, after the rotating speed of tire reaches default fast state, multiple power sensors gather the force signal in vertical, horizontal, longitudinal three directions of tire countershafts.

Wherein, in one embodiment of the invention, default fast state can be that system sets in advance, and also can be that user oneself arranges, and can be regarded as after tire travels through preheating, starts to enter constant speed steady state (SS).It should be noted that, in the inhomogeneity process of measurement, the rotational speed of tire remains on specific fast state always, but according to actual measuring method and standard, can choose several different speed class and measure respectively.

In addition, in one embodiment of the invention, multiple power sensors can comprise the first power sensor, the second power sensor and the 3rd power sensor.Wherein, in an embodiment of the present invention, the first power sensor can gather the force signal in the vertical direction of tire, and the second power sensor can gather the force signal in a lateral direction of tire, and the 3rd power sensor can gather the force signal on the longitudinal direction of tire.

Particularly, when tire travels through preheating, after starting to enter constant speed steady state (SS), multiple power sensors gather respectively the force signal (Fz, Fy, Fx) in vertical, horizontal, longitudinal three directions (z, y, x) of tire countershaft.

S202, the rotating cycle that makes tire is M, and 360 degree of circle are divided into N decile, wherein, M is positive integer.

In one embodiment of the invention, when tire often revolves while turning around, rotary encoder can send N pulse signal, and wherein N is positive integer.Like this, for example, if select the rotary encoder of 1024 pulses of every circle, so when tire often revolves while turning around, rotary encoder can be divided into 1024 deciles by 360 degree of circle according to the pulse signal sending.

S203, in the time that tire rotation one encloses, gathers the force signal in vertical, horizontal, longitudinal three directions of tire countershaft in every decile.

Particularly, in the time that tire rotation one encloses, data acquisition board can gather the force signal (Fz, Fy, Fx) in vertical, horizontal, longitudinal three directions (z, y, x) of tire countershaft in every decile.

S204, after tire rotation M circle, the force signal respectively every decile being collected after M circle is averaging.

For example, record the force signal data that collect taking 1024 as cycle, data point 1,1+1024,1+2*1024 ..., 1+M*1024 is one group and averages; Data point 2,2+1024,2+2*1024 ..., 2+M*1024 is one group and averages; Data point 1023,1023+1024,1023+2*1024 ..., 1023+M*1024 is one group and averages.Wherein, if each measurement can try to select 100 circles, the maximal value of M is 100.

S205, the force signal and the relation that after M circle, collect according to the every decile after being averaging, determine the homogeneity of tire.

It should be noted that, in one embodiment of the invention, when tire often revolves while turning around, data acquisition board can be controlled the starting point of force signal of collection all in same position or angle.So duplicate measurements several times (for example, can try to select 100 times), then by the data of every some duplicate measurements (as 100 times) on an average, as final result.According to the principle of above-mentioned Domain Synchronous average algorithm, all random or different frequencies, at the signal of same position, can be cancelled each other, and summation is along with stacking fold more and more approaches zero, so improve widely its signal to noise ratio (S/N ratio).

Like this, the force signal of the undesired signal that can be eliminated, and can calculate according to the relation between this force signal and force signal and the anglec of rotation of tire the homogeneity of tire.Should be appreciated that in an embodiment of the present invention, the pulsed frequency of rotary encoder is the sample frequency of power sensor, can will between the force signal of power sensor collection and tire rotation angle, set up relation one to one thus.

According to the embodiment of the present invention for measuring the method for high speed uniformity in tires, the rotating cycle that can make tire is M, and 360 degree of circle are divided into N decile, in the time that tire rotation one encloses, can gather the force signal in vertical, horizontal, longitudinal three directions of tire countershaft in every decile, and after tire rotation M circle, the force signal respectively every decile being collected after M circle is averaging, and the force signal and the relation that after M circle, collect according to the every decile after being averaging, the homogeneity of determining tire, has improved degree of accuracy.

In addition, the invention allows for a kind of for measuring the system of high speed uniformity in tires.

Fig. 3 is according to an embodiment of the invention for measuring the structural representation of system of high speed uniformity in tires.Fig. 4 be according to the embodiment of the present invention for measuring the schematic diagram of system of high speed uniformity in tires.

As shown in Figure 3 and Figure 4, this system that is used for measuring high speed uniformity in tires can comprise: tire drum tester 100, multiple power sensor 200, rotary encoder 300 and data acquisition board 400.

Wherein, as shown in Figure 3, multiple power sensors 200 are connected with the rotating shaft 111 of the tire 110 in tire drum tester 100, after the rotating speed that multiple power sensors 200 are used in tire 110 reaches default fast state, gather the force signal in vertical, horizontal, longitudinal three directions of tire 110 countershafts 111.

Wherein, in one embodiment of the invention, default fast state can be that system sets in advance, and also can be that user oneself arranges, and can be regarded as after tire 110 travels through preheatings, starts to enter constant speed steady state (SS).It should be noted that, in the inhomogeneity process of measurement, the rotational speed of tire 110 can remain on specific fast state always, but according to actual metering system and standard, can choose multiple different speed class and measure respectively.

In addition, in one embodiment of the invention, multiple power sensors 200 can comprise the first power sensor 210, the second power sensor 220 and the 3rd power sensor 230.Wherein, in an embodiment of the present invention, the first power sensor 210 can gather the force signal in the vertical direction of tire 110, and the second power sensor 220 can gather the force signal in a lateral direction of tire 110, and the 3rd power sensor 230 can gather the force signal on the longitudinal direction of tire 110.

More specifically, when tire 110 travels through preheating, after starting to enter constant speed steady state (SS), multiple power sensors 200 gather respectively the force signal (Fz in vertical, horizontal, longitudinal three directions (z, y, x) of tire 110 countershafts 111, Fy, Fx).

As shown in Figure 3, rotary encoder 300 is connected with the rotating shaft 111 of tire 110, and rotary encoder 300 can be used for transmitted signal.Data acquisition board 400 can be used for according to pulse signal acquisition force signal, and by opening relationships between this force signal and the anglec of rotation of tire 110, and according to the homogeneity of Domain Synchronous average algorithm and this relation measurement tire 110.

In one embodiment of the invention, rotary encoder 300 can, specifically for often revolving at tire 110 while turning around, send N pulse signal, and wherein N is positive integer.

Particularly, force signal Fx, Fy, Fz that data acquisition board 400 can be passed back according to the multiple power sensors 200 that collect, the pulse signal sending with rotary encoder 300 can demonstrate three direction x orthogonal in rotating shaft 111, y, the cyclical variation rule that counter-force on z is rotated with tire 110, and can according to counter-force year tire 110 the relation of the anglec of rotation can calculate the homogeneity of tire 110.Should be appreciated that in an embodiment of the present invention, the pulsed frequency of rotary encoder 300 is the sample frequency of multiple power sensors 200, between the force signal that multiple power sensors 200 can be gathered thus and tire 110 anglecs of rotation, sets up relation one to one.

It should be noted that, tire 110, in the process of High Rotation Speed, due to the uneven distribution of its quality, can produce periodic counter-force in rotating shaft 111, and its frequency is the integral multiple of tire 110 rotational frequencies.But the noise signal that the counter-force signal of reflection unevenness can be produced by plant equipment such as tire drum tester 100, rotary drums 112 is disturbed, sometimes noise signal is excessively strong, cover useful periodic signal, therefore be necessary to use Domain Synchronous average algorithm, will with the incoherent signal cancellation of tire 110 rotation period.

Also it should be noted that, basic assumption of the present invention is: the various power that tire 110 unevenness produce are when walking " periodic functions ", and with the rotary synchronous of tire 110.So, after the rotating speed of tire 110 reaches stable fast state, can be according to Domain Synchronous average algorithm by the undesired signal and the frequency signal not identical with tire 110 gyro frequencys that produce at random, stack repeatedly then on average after cancellation gradually.That is to say, " signal to noise ratio (S/N ratio) " of the function that measure, after Synchronization overlapping and averaging repeatedly, for example 10 times to 100 times, can be improved widely.Therefore, the undesired signal of the vibration of the steelframe on testing machine gained can be eliminated effectively.Wherein, the specific implementation process of Domain Synchronous average algorithm can be with reference to the specific descriptions of said method.

Thus, can according to Domain Synchronous average algorithm first will with the incoherent signal cancellation of tire 110 rotation period, can calculate according to counter-force afterwards the homogeneity of wheel with the relation of the anglec of rotation of tire 110.

In order to improve degree of accuracy, in one embodiment of the invention, data acquisition board 400 can be specifically for: the rotating cycle that makes tire 110 is M, and 360 degree of circle are divided into N decile, and wherein, M is positive integer; Whenever tire 110 revolves while turning around, gather the force signal in vertical, horizontal, longitudinal three directions of tire 110 countershafts 111 in every decile; After tire 110 rotates M circle, the force signal respectively every decile being collected after M circle is averaging; And the force signal and the relation that after M circle, collect according to the every decile after being averaging, determine the homogeneity of tire 110.

For example, if select the rotary encoder 300 of 1024 pulses of every circle, so when tire 110 often revolves while turning around, rotary encoder 300 can be divided into 1024 deciles by 360 degree of circle according to the pulse signal sending.Like this, whenever tire 110 revolves while turning around, data acquisition board 400 can gather the force signal (Fz, Fy, Fx) in vertical, horizontal, longitudinal three directions (z, y, x) of tire 110 countershafts 111 in every decile.Afterwards, after tire 110 rotates M circle, the force signal respectively every decile being collected after M circle is averaging.

For example, record the force signal data that collect taking 1024 as cycle, data point 1,1+1024,1+2*1024 ..., 1+M*1024 is one group and averages; Data point 2,2+1024,2+2*1024 ..., 2+M*1024 is one group and averages; Data point 1023,1023+1024,1023+2*1024 ..., 1023+M*1024 is one group and averages.Wherein, if each measurement can try to select 100 circles, the maximal value of M is 100.

It should be noted that, in one embodiment of the invention, data acquisition board 400 can often be revolved while turning around at tire 110, controls the starting point of the force signal gathering all in same position or angle.So duplicate measurements several times (for example, can try to select 100 times), then by the data of every some duplicate measurements (as 100 times) on an average, as final result.According to the principle of above-mentioned Domain Synchronous average algorithm, all random or different frequencies, at the signal of same position, can be cancelled each other, and summation is along with stacking fold more and more approaches zero, so improve widely its signal to noise ratio (S/N ratio).

According to the embodiment of the present invention for measuring the system of high speed uniformity in tires, can be by multiple power sensors after the rotating speed of tire reaches default fast state, gather the vertical of tire countershaft, laterally, force signal in longitudinal three directions, the pulse signal acquisition force signal that data acquisition board sends according to rotary encoder, and by opening relationships between this force signal and the anglec of rotation of tire, and according to the homogeneity of Domain Synchronous average algorithm and this relation measurement tire, it is simple many that the method that the present invention proposes is wanted, therefore reduced measurement cost, and can meet equally technical demand.

In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of instructions such as " circumferentially " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.

In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, at least one this feature can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " multiple " is at least two, for example two, and three etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or integral; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless separately there is clear and definite restriction.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.

In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, First Characteristic Second Characteristic " on ", " top " and " above " but First Characteristic directly over Second Characteristic or oblique upper, or only represent that First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " can be First Characteristic under Second Characteristic or tiltedly, or only represent that First Characteristic level height is less than Second Characteristic.

Any process of otherwise describing in process flow diagram or at this or method are described and can be understood to, represent to comprise that one or more is for realizing module, fragment or the part of code of executable instruction of step of specific logical function or process, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiments of the invention person of ordinary skill in the field.

Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple steps or method can realize with being stored in software or the firmware carried out in storer and by suitable instruction execution system.For example, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: there is the discrete logic for data-signal being realized to the logic gates of logic function, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.

Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a kind of computer-readable recording medium, this program, in the time carrying out, comprises step of embodiment of the method one or a combination set of.

In addition, the each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium using the form of software function module.

The above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.

In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, to the schematic statement of above-mentioned term not must for be identical embodiment or example.And, specific features, structure, material or the feature of description can one or more embodiment in office or example in suitable mode combination.In addition,, not conflicting in the situation that, those skilled in the art can carry out combination and combination by the feature of the different embodiment that describe in this instructions or example and different embodiment or example.

Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, amendment, replacement and modification.

Claims (10)

1. for measuring a method for high speed uniformity in tires, it is characterized in that, described tire is arranged on tire drum tester, and the rotating shaft of described tire is connected with multiple power sensors and rotary encoder respectively, and described method comprises:

S1, after the rotating speed of described tire reaches default fast state, described multiple power sensors gather described tire to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft;

Force signal described in the pulse signal acquisition that S2, data acquisition board send according to described rotary encoder, and by opening relationships between described force signal and the anglec of rotation of described tire, and measure the homogeneity of described tire according to Domain Synchronous average algorithm and described relation.

2. method according to claim 1, it is characterized in that, described multiple power sensor comprises the first power sensor, the second power sensor and the 3rd power sensor, described the first power sensor gathers the force signal in the vertical direction of described tire, described the second power sensor gathers the force signal in a lateral direction of described tire, and described the 3rd power sensor gathers the force signal on the longitudinal direction of described tire.

3. method according to claim 1, is characterized in that, when described tire often revolves while turning around, described rotary encoder sends N pulse signal, and wherein N is positive integer.

4. method according to claim 3, is characterized in that, described step S2 comprises:

The rotating cycle that makes described tire is M, and 360 degree of circle are divided into N decile, and wherein, M is positive integer;

In the time that described tire rotation one encloses, gather tire described in every decile to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft;

After described tire rotation M circle, the force signal respectively described every decile being collected after described M circle is averaging;

The force signal and the described relation that after M circle, collect according to the every decile after being averaging, determine the homogeneity of described tire.

5. method according to claim 4, is characterized in that, when described tire often revolves while turning around, the starting point of the force signal that described data acquisition board control gathers is all in same position or angle.

6. for measuring a system for high speed uniformity in tires, it is characterized in that, comprising: tire drum tester, multiple power sensor, rotary encoder and data acquisition board, wherein,

Described multiple power sensor is connected with the rotating shaft of the tire in described tire drum tester, described multiple power sensor, for after the rotating speed of described tire reaches default fast state, gathers described tire to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft;

Described rotary encoder is connected with the rotating shaft of described tire, and described rotary encoder is for transmitted signal;

Described data acquisition board is for according to force signal described in described pulse signal acquisition, and by opening relationships between described force signal and the anglec of rotation of described tire, and measures the homogeneity of described tire according to Domain Synchronous average algorithm and described relation.

7. system according to claim 6, it is characterized in that, described multiple power sensor comprises the first power sensor, the second power sensor and the 3rd power sensor, described the first power sensor gathers the force signal in the vertical direction of described tire, described the second power sensor gathers the force signal in a lateral direction of described tire, and described the 3rd power sensor gathers the force signal on the longitudinal direction of described tire.

8. system according to claim 6, is characterized in that, when described rotary encoder turns around specifically for often revolving at described tire, sends N pulse signal, and wherein N is positive integer.

9. system according to claim 8, is characterized in that, described data acquisition board specifically for:

The rotating cycle that makes described tire is M, and 360 degree of circle are divided into N decile, and wherein, M is positive integer;

In the time that described tire rotation one encloses, gather tire described in every decile to the force signal in vertical, horizontal, longitudinal three directions of described rotating shaft;

After described tire rotation M circle, the force signal respectively described every decile being collected after described M circle is averaging;

The force signal and the described relation that after M circle, collect according to the every decile after being averaging, determine the homogeneity of described tire.

10. system according to claim 9, is characterized in that, described data acquisition board is often revolved while turning around at described tire, controls the starting point of the force signal gathering all in same position or angle.